Monday, May 9, 2022

Method of pouring and cleaning of castings

Commonly used pouring methods in investment casting are:
1) There are the following types of thermal gravity casting methods.
This is the most widely used form of casting, that is, after the shell is removed from the roaster, it is cast at high temperature. At this time, the metal cools slowly in the mold shell, and the mold can be filled with high fluidity, so the casting can well replicate the shape of the cavity and improve the accuracy of the casting. However, the slow cooling of the casting in the hot mold will cause coarse grains, which reduces the mechanical properties of the casting. When casting carbon steel castings, the surface of the casting that cools more slowly is also prone to oxidation and decarburization, which reduces the surface hardness, finish and dimensional accuracy of the casting.invest-casting.com Precision Investment Castings China prototype company service include : High Quality Investment Casting Parts Custom,Lost Wax Investment CastingSand Casting,Lost Foam Casting,Gravity Casting,Die Casting,Graphite Casting ,Casting Moldsmanufacturers.
2) Vacuum suction casting
Put the mold shell in the vacuum casting box, and suck the gas in the mold cavity through the tiny pores in the mold shell, so that the liquid metal can better fill the mold cavity, copy the shape of the mold cavity, improve the casting accuracy, prevent pores, pouring Insufficient defects. This law has been applied abroad.
3) Crystallization under pressure
Put the shell in the pressure tank for pouring. After the end, the pressure tank is closed immediately, and high-pressure air or inert gas is introduced into the tank to solidify the casting under pressure to increase the density of the casting. The maximum pressure abroad has reached 150atm.
4) Directional crystallization (directional solidification)
Some investment castings such as turbine blades, magnetic steel, etc., if their crystalline structure is columnar crystals arranged in a certain direction, their working performance can be greatly improved, so the directional crystallization technology of investment casting is rapidly developed.
Casting cleaning
The main contents of investment casting cleaning are as follows:
(1) Remove the mold shell from the casting;
(2) Remove the casting from the pouring system;
(3) Remove the shell refractory adhering to the casting;
(4) Cleaning after heat treatment of castings, such as descaling, edge and cutting gate residues, etc.invest-casting.com Metal Casting Material include : Stainless Steel CastingAluminum CastingIron CastingBrass CastingTitanium CastingSteel Casting

The task of investment casting process design is
(1) Analyze the manufacturability of the casting structure;
(2) Select a reasonable process plan, determine the relevant casting process parameters, and draw the casting diagram on the basis of the above;
(3) Design the pouring system and determine the module structure.
It should be noted here that when considering the above three aspects, the main basis is still the basic principles of the general casting process, especially when determining the process plan and process parameters (such as casting fillet, machining allowance, process ribs, etc.) , except that the specific data is slightly different due to the technological characteristics of investment casting, the design principle is exactly the same as that of sand casting.
The task and importance of investment casting process design
Investment casting is a casting process with less or no cutting. It was also called lost wax casting in the past. Because the castings produced by the investment casting process are better than other casting methods in terms of dimensional accuracy and surface quality In addition, the investment casting method can complete the production of some complex and difficult to process castings, so it is deeply loved by enterprises.
Regarding the investment casting process, the investment casting process design is one of the most important links in the entire investment casting process. This link has a large technical difficulty factor and plays a very important role in the entire investment casting process. This link is mostly due to some professional and technical people.
Like other casting process designs, the design tasks of the investment casting process are: a. According to specific requirements, analyze the craftsmanship of the casting structure; b. Plan a reasonable process plan, determine the relevant casting process parameters, and draw the casting diagram on this basis. ;c. Design the pouring system and determine the module structure. Except for the specific data due to the slightly different process characteristics of investment casting, the design principle is exactly the same as that of sand casting.
Since the investment casting process design link is of great significance to the entire casting process, and this link has very high requirements on the quality of the designers themselves, enterprises should pay considerable attention to this link.

invest-casting.com Metal Casting Industries include : Automotive Casting ,Pump Casting ,Plumbing Sanitary Casting ,Lock Casting ,Medical Casting,Machinery Casting ,Marine Casting ,Food Machine Casting,LightingCasting.

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Investment Casting Materials and Manufacturing Process

Mold material

The performance of the molding material should not only ensure the convenient production of investment molds with accurate dimensions and high surface finish, good strength and light weight, but also create conditions for the manufacture of mold shells and good castings. Molding materials are generally formulated with waxes, natural resins and plastics (synthetic resins). All mold materials mainly prepared with wax materials are called wax-based mold materials, and their melting point is low, 60~70 ° C; all mold materials mainly prepared with natural resins are called resin-based mold materials, with a slightly higher melting point, about 70 °C. ~120℃.

invest-casting.com Precision Investment Castings China prototype company service include : High Quality Investment Casting Parts Custom,Lost Wax Investment CastingSand Casting,Lost Foam Casting,Gravity Casting,Die Casting,Graphite Casting ,Casting Moldsmanufacturers.

Manufacture of Folding Investments

In the production, the method of pressing the paste mold material into the mold is mostly used to manufacture the investment mold. Before pressing the investment, a thin layer of release agent should be applied to the surface of the embossing so that the investment can be removed from the embossing. When pressing wax-based molding materials, the parting agent can be engine oil, turpentine, etc.; when pressing resin-based molding materials, a mixture of sesame oil and alcohol or silicone oil is often used as a parting agent. The thinner the parting agent layer, the better, so that the investment mold can better replicate the surface of the embossing and improve the surface finish of the investment mold. There are three methods of pressing investment, plunger pressurization method, air pressure method and piston pressurization method.

invest-casting.com Metal Casting Industries include : Automotive Casting ,Pump Casting ,Plumbing Sanitary Casting ,Lock Casting ,Medical Casting,Machinery Casting ,Marine Casting ,Food Machine Casting,LightingCasting.

Assembly of Folding Investments

The assembly of the investment mold is to combine the investment mold that forms the casting and the investment mold that forms the gating riser system. There are two main methods:
1. Welding method Use a thin soldering iron to melt the joints of the investment to weld the investment together. This method is more common.
2. Mechanical assembly method In the mass production of small investment castings, the mechanical assembly method has been widely adopted abroad to combine modules. The use of this module can greatly improve the combination and efficiency of the modules, and the working conditions have also been improved.
The main processes and processes in the shell making process are:
1) Degreasing and degreasing of modules
In order to improve the ability of the coating to wet the surface of the module, the oil stain on the surface of the module needs to be removed when the wax-based moulding material is used to make the investment mould.
2) Apply paint and sand on the module
Before painting and hanging the paint, the paint should be stirred evenly to reduce the precipitation of refractory materials in the paint bucket as much as possible, and the viscosity or specific gravity of the paint should be adjusted so that the paint can fill and wet the investment mold well. The module is immersed in the paint and shakes up and down, so that the paint can well wet the investment mold and evenly cover the surface of the module. After the paint is applied, sanding can be carried out.
3) Shell drying and hardening
After each layer of shell is coated, it must be dried and hardened, so that the binder in the coating changes from sol to jelly and gel, and connects the refractory materials together.
4) Loss of investment from the shell
After the shell is completely hardened, the module needs to be melted from the shell. Because the module is usually made of wax-based mold material, this process is also called dewaxing. According to the different heating methods, there are many dewaxing methods, the hot water method and the same pressure steam method are used more.
5) Roasted shell
If molding (sand filling) is required for pouring, before firing, the demolded shell should be buried in the sand in the box, and then fired in a furnace. If the high temperature strength of the shell is high and no casting is required, the demolded shell can be directly sent to the furnace for roasting. During roasting, the furnace temperature is gradually increased, and the shell is heated to 800-1000 ° C and kept for a period of time before pouring.

invest-casting.com Metal Casting Material include : Stainless Steel CastingAluminum CastingIron CastingBrass CastingTitanium CastingSteel Casting

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What is investment casting ?

What is investment casting ?
Investment casting, also known as lost wax casting, includes processes such as pressing wax, wax repairing, tree forming, dipping, wax melting, molten metal casting and post-processing. Lost wax casting is to use wax to make a wax mold of the part to be cast, and then coat the wax mold with mud, which is a mud mold. After the clay mold is dry, put it in hot water to melt the inner wax mold. Take out the clay mold that has melted the wax casting mold and then bake it into a pottery mold. Once roasted. Generally, the pouring port is left when the mud mold is made, and then the molten metal is poured from the pouring port. After cooling, the required parts are made.

invest-casting.com Metal Casting Material include : Stainless Steel CastingAluminum CastingIron CastingBrass CastingTitanium CastingSteel Casting

Introduction to Investment Casting


When using wax to make patterns, investment casting is also called "lost wax casting". Investment casting usually refers to making a pattern in a fusible material, coating the surface of the pattern with several layers of refractory material to make a mold shell, and then melting the pattern out of the mold shell to obtain a mold without parting surface. A casting solution that can be filled with sand casting. Because the patterns are widely made of waxy materials, investment casting is often referred to as "lost wax casting".
The types of alloys that can be produced by investment casting include carbon steel, alloy steel, heat-resistant alloys, stainless steel, precision alloys, permanent magnet alloys, bearing alloys, copper alloys, aluminum alloys, titanium alloys, and ductile iron.
The shape of investment castings is generally more complex, the minimum diameter of the holes that can be cast on the castings can reach 0.5mm, and the minimum wall thickness of the castings is 0.3mm. In production, some parts that were originally composed of several parts can be designed into integral parts by changing the structure of the parts and directly cast by investment casting, so as to save processing time and consumption of metal materials, and make the part structure more accurate. to be reasonable.
The weight of investment castings Company is mostly zero to dozens of Newtons (from a few grams to more than ten kilograms, generally not more than 25 kilograms). It is more troublesome to use the investment casting method to produce too heavy castings.
The investment casting process is complicated and difficult to control, and the materials used and consumed are more expensive, so it is suitable for the production of small parts with complex shapes, high precision requirements, or difficult to perform other processing, such as turbine engine blades.

invest-casting.com Metal Casting Industries include : Automotive Casting ,Pump Casting ,Plumbing Sanitary Casting ,Lock Casting ,Medical Casting,Machinery Casting ,Marine Casting ,Food Machine Casting,LightingCasting.

advantage


The dimensional accuracy of investment castings is relatively high, generally reaching CT4-6 (CT10~13 for sand casting and CT5~7 for die casting). Of course, due to the complex process of investment casting, there are many factors that affect the dimensional accuracy of castings, such as mold casting. The shrinkage of the material, the deformation of the investment mold, the linear change of the shell during the heating and cooling process, the shrinkage rate of the alloy, and the deformation of the casting during the solidification process, etc., so the dimensional accuracy of ordinary investment castings is high, but its Consistency still needs to be improved (the dimensional consistency of castings using medium and high temperature waxes is much improved).
When pressing the investment mold, a mold with a high surface finish of the cavity is used, so the surface finish of the investment mold is also relatively high. In addition, the shell is made of high temperature-resistant special binder and refractory paint prepared from refractory materials, which is coated and hung on the investment mold, and the inner surface of the cavity that is in direct contact with the molten metal has a high smoothness. Therefore, the surface finish of investment castings is higher than that of general castings, generally reaching Ra.1.6~3.2μm.
The biggest advantage of investment casting is that investment castings have high dimensional accuracy and surface finish, so machining work can be reduced, just leave a little machining allowance on parts with higher requirements, and even some castings only Leave grinding, polishing allowance, can be used without machining. It can be seen that the use of investment casting method can save a lot of machine tool equipment and processing time, and greatly save metal raw materials.
Another advantage of the investment casting method is that it can cast complex castings of various alloys, especially superalloy castings. For example, the blade of a jet engine has a streamlined outline and an inner cavity for cooling, which can hardly be formed by machining. The investment casting process can not only achieve mass production and ensure the consistency of castings, but also avoid the stress concentration of residual knife lines after machining.


manufacture


The first process of investment casting production is to manufacture the investment mold. The investment mold is used to form the model of the cavity in the refractory shell. Therefore, in order to obtain castings with high dimensional accuracy and surface finish, the investment mold itself should have a high size. Precision and surface finish. In addition, the performance of the investment mold itself should also make the subsequent processes such as shell making as simple as possible. In order to obtain the investment mold with the above-mentioned high-quality requirements, in addition to having a good pressing shape (the mold for pressing the investment mold), it is also necessary to select the appropriate molding material (referred to as the mold material) and a reasonable molding process.

invest-casting.com Precision Investment Castings China prototype company service include : High Quality Investment Casting Parts Custom,Lost Wax Investment CastingSand Casting,Lost Foam Casting,Gravity Casting,Die Casting,Graphite Casting ,Casting Moldsmanufacturers.

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Sunday, March 13, 2022

Process Analysis of CNC Machining Parts Drawing

Process Analysis of CNC Machining Parts Drawing

 

(1) The method of dimensioning in the drawings of CNC machining parts

 

The size on the part drawing is an important basis for manufacturing and inspecting parts. In the production (Produce), the size of the part drawing is required to be free of any errors. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, laser cutting china, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. In addition to correct, complete, and clear requirements for marking the size on the part drawing, rationality should also be considered. It should not only meet the design requirements, but also facilitate processing and measurement. ? Regarding dimensioning, it mainly includes functional dimensions, non-functional dimensions, nominal dimensions, basic dimensions, reference dimensions, repeat dimensions, and so on. The dimensions marked on the part drawing are complete and correct, making it easy for the processor to analyze, measure, and process. According to these dimensional accuracy (accuracy), the blank is determined to be Φ95*250mm and the material is 45 steel.

 

(2), analyze (Analyse) the geometric elements of the contour of the CNC machining aluminum parts

 

The contour of the part is mainly composed of cylindrical surface, spherical surface, groove (gōucáo), keyway, inner hole and so on. CNC machining is a process method for parts processing on CNC machine tools. The process regulations of CNC machine tool processing and traditional machine tool processing are generally the same, but significant changes have also taken place. A machining method that uses digital information to control the displacement of parts and tools. It is an effective way to solve the problems of variable parts, small batches, complex shapes, and high precision, and to achieve high-efficiency and automated processing.

 

(3) Analyse the structure and craftsmanship of CNC machining parts

 

The part is a slender shaft. The slender shaft has the characteristics of small diameter and too long length. The length of the suspension body is too long when processed, and it is easy to vibrate the knife or the surface roughness value of the processing is too low, so it must be used for processing. Auxiliary tool holder and auxiliary fixture. CNC machining General CNC machining usually refers to computer digital control precision machining, CNC machining lathe, CNC machining milling machine, metal forging and milling machine, etc. The feed route of finishing is basically carried out along the part contour sequence. Therefore, the focus of determining the feed route is to determine the feed route of rough machining and idle stroke. There is also something to pay attention to during heat treatment, because it will deform after being hardened by cold work, resulting in a bowing or S-shape.

 

(4) Analyse the precision (precision) and technical requirements of CNC machining parts

 

The precision (precision) and various technical requirements of this part are complete and reasonable

The CNC machining precision (precision) in this process is required to be high. This requirement can be met in the CNC machine tool (attribute: automated machine tool). The machining is divided into three types: rough machining, semi-finishing and finishing. The procedure is carried out.

. The left end of the outer circle size of Φ90 in the figure has higher position accuracy (precision) requirements. All procedures in this section should be completed in one clamping process, except for the keyway.

. For surfaces that require high surface roughness, the circumferential constant linear speed should be used for cutting.

Copyright notice: This article comes from https://be-cu.com/

 

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Tuesday, March 8, 2022

The Influence of CNC Turning and Milling Machining on Turning Efficiency

The cutting efficiency of CNC lathes will be affected by human factors, environmental factors and the machine tool itself. Let's talk about the influence of cutting amount and cutting tools on CNC lathe processing among many factors.

 

Reasonable cutting amount can improve the efficiency of CNC lathe. When the laser cutting speed is increased by 10 times and the feed rate is increased by 20 times, far beyond the traditional cutting forbidden zone, the cutting mechanism has undergone a fundamental change.

 

The result of CNC turning and milling combined processing is: the metal removal rate per unit power is increased by 30% to 40%, the cutting force is reduced by 30%, the cutting life of the tool is increased by 70%, and the cutting left on the workpiece is greatly reduced. Heat, cutting vibration almost disappeared; cutting processing has taken an essential leap. According to the current situation of CNC lathes, increase the feed per tooth, improve productivity and tool life.

  

The effect of CNC milling and turning compound machining of ear cutters on CNC lathes is like the effect of wheels on automobiles. The material used to make the tool must have high high temperature hardness and wear resistance, necessary bending strength, impact toughness and chemical inertness, good manufacturability (wire cutting, metal forging, sueface treatment, etc.), and not easy to deform. A good tool can improve the efficiency of machining and the accuracy of the workpiece to be cut.

  

Other factors such as power supply, familiar operation, reasonable materials and other factors will affect the processing of CNC lathes.

 

Copyright notice: This article comes from https://be-cu.com/

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Introduction to the correct maintenance of exterior lamps

It is an extremely quick and simple task to check the bulbs of lamps outside the car for burnout failures. However, it is not so simple to maintain a comprehensive system of exterior lamps. Timely maintenance of exterior lights is very important to the driver, because it not only affects the comfort of driving, but also directly affects the safety of driving. It is often difficult for car owners to realize that the headlights, taillights, turn signals or parking lights are not working properly before being reminded. By the way, the work of replacing a burnt out bulb is very simple, and the cost of DIY is lower than the charging standard for maintenance of the lighting system at the repair station.

In more cases, the failure of car lights is by no means limited to small problems such as bulb burnout, rusty socket or damaged plug. It is often necessary to adopt professional diagnostic techniques to analyze the root cause of the failure. Even for the most expensive cars, the internal and external lamps are controlled by the main computer; while for luxury cars, only the headlights are controlled by three computers.

If the car is equipped with DRLs (Daytime Running Lamps), you must first understand the working principle of these devices. For example, some daytime running lights cannot be turned on before the engine is started; for some daytime running lights, if the parking brake has not been cancelled, even if the engine has been started, the daytime running lights still cannot work normally. If the vehicle is equipped with light-controlled lights (that is, when the external light is dim to a certain degree, the system has the function of automatically turning on the headlights), you may wish to check the working conditions of the lights during the light sensitivity from the weakest to the strongest state. Of course Don’t neglect to check the automatic shutdown timer. If the system is equipped with a timer, please set it to the maximum delay.

If the headlights are damaged, they are usually replaced with similar lamps. Some cars are equipped with high-intensity discharge headlights HID, which generates high-density light sources through high-voltage arc discharge generated by its pre-designed electronic system. Note that ordinary quartz-halogen bulbs cannot be used here. In addition, check the headlight lens for cracks, because although surface cracks will not affect the lighting performance of the headlights, moisture will penetrate into the lamps along the cracks, which will inevitably reduce the service life of the bulb.

The calibration of the direction of the headlights should also be included in the list of maintenance items, because in order to ensure the maximum safety of the driver, the headlights must be able to provide good forward lighting for the moving vehicle.

While grasping the key, don't forget to check other light systems, such as turn signals, license plate lights, width lights, parking lights, reversing lights, and brake lights (including the middle-high brake lights CHMSL). In addition, many vehicles also use fog lights as standard equipment or popular options. Fog lights are generally installed at a lower position on the car, so they are easily damaged by stones. When maintaining them, in addition to checking the lighting system In addition to itself, the cracks in the headlight lens should not be ignored.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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What is brass, red copper and red copper, and what is the difference?

1. Brass is an alloy composed of copper and zinc. Brass composed of copper and zinc is called ordinary brass. If it is a variety of alloys composed of more than two elements, it is called special brass. Brass parts has strong wear resistance. Brass is often used to make valves, water pipes, connecting pipes for internal and external air conditioners, and radiators.

 

2. Red copper, also known as red copper, is a simple substance of copper, so named because of its purple-red color. See copper parts for various properties. Red copper is industrial pure copper with a melting point of 1083°C, no allotropic transformation, and a relative density of 8.9, which is five times that of magnesium parts. The mass of the same volume is about 15% heavier than ordinary steel parts.

 

The red copper is generally called red copper because of its rose red color and purple after forming an oxide film on the surface. It is copper containing a certain amount of oxygen, so it is also called oxygen-containing copper.

 

3. Red copper is pure copper, also known as red copper parts, which is a simple substance of copper, and it is named because of its purple-red color. See copper for various properties. Red copper is industrial pure copper with a melting point of 1083°C, no allotropic transformation, and a relative density of 8.9, which is five times that of magnesium.

 

The mass of the same volume is about 15% heavier than ordinary steel. Because it has a rose red color and is purple after an oxide film is formed on the surface treatment, it is generally called copper. It is copper containing a certain amount of oxygen, so it is also called oxygen-containing copper.

 

Red copper has good electrical and thermal conductivity, excellent plasticity, and is easy to be processed by hot and cold pressure. It is widely used in the manufacture of wire cutting, cables, electric brushes, electric spark copper and other products that require good electrical conductivity.

 

The difference between copper and brass

 

1. Appearance color

 

Brass: It is light golden yellow and shiny.

 

Copper: Rose red, shiny.

 

2. Ingredients

 

Red copper: The content of copper has reached 99.9%.

 

Brass: about 60% of copper; about 40% of zinc parts; some grades contain about 1% of lead, which is impurity.

 

3. Strength

 

Brass: higher.

 

Copper: lower.

 

4. Density

 

The density of brass (8.93g/cm3) is mostly used for mechanical bearing lining, and it is wear-resistant. metal castings are often used to make valves and pipe fittings.

 

Red copper. Pure copper, also known as red copper, has a density (7.83g/cm3), a melting point of 1083 degrees, and is non-magnetic.

Copyright notice: This article comes from https://be-cu.com/

 

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How to quickly deal with the fogging of car front windshield

“The weather is getting cold. A few days ago, it was raining, damp and cold, and the front windshield was foggy. I was panicked.” Miss Guo, who lives in Jiaojiang, just bought a car and has to drive to Luqiao to work every day. Faced with this old problem that seriously affected driving safety, she was at a loss. “I had to turn on the air conditioner and blow on the glass. But when I turned on the air conditioner on a cold day, I would catch the cold as well. This is no good.”
The reporter learned that the reason for the fogging of the car windows is “heating inside and cold outside”. When the temperature difference between the inside and outside of the car is large, the water vapor exhaled by the occupants of the car will condense into water vapor when it encounters the cold glass. This is an old problem, but not a small one. Once the line of sight is blocked, accidents may occur within a few seconds. Therefore, defogging is essential in cold rainy days.
The day before yesterday, the reporter interviewed Mr. Han with 5 years of driving experience, Coach Lin from Wanli Auto School, and Master Su from Shunfeng Auto Repair Shop on the issue of "fogging in the front", and summarized three methods with higher usage rates for comparison.
*The original method: wipe with a dry cloth or paper towel
advantages: immediate results
Disadvantages: laborious, unsafe, leaving marks after rubbing
*The original method is to wipe the glass directly with a dry cloth. Many citizens must have seen this kind of scene: the old drivers always keep a towel and wipe the glass when they stop at a red light. The disadvantage of this method is that it is more laborious, there will still be traces on the glass after wiping, and it will soon become foggy. If you wipe while driving, it is easy to cause an accident. Netizen Uranus1126 said that on the first rainy day after he picked up the car, he in the passenger seat helped the driver's wife wipe the glass, “but I still scratched with another car afterwards.”
*Convenient way: blow with hot air
Advantages: No need to distract
Disadvantages: the effect is slow, and the rest of the car windows are still foggy
The second method is to blow directly with hot air. However, this method works relatively slowly, and when the hot air is turned on when the vehicle is moving, the fog on the front glass is getting bigger and bigger, and the glass will gradually become clear after waiting for more than ten minutes. The netizen “The first opportunity in the park” suggested that the hot air should be turned on immediately after the car is warmed up. At the beginning, use a “high temperature” above 25°C to blow first, and then slowly lower the temperature after the fog disappears, and control it to around 22°C.
*Creative method: detergent with dry cloth
Advantages: Good prevention effect
Disadvantages: to be dealt with in advance
The owner of the car, Mr. Han, is very happy to accept new things. Regarding the issue of “defogging in cold weather”, he collected a lot of materials on the Internet and tried the method of “dishwashing detergent with dry cloth”, and the effect was not bad. Choose a sunny day, mix the kitchen detergent with water (about 1:6), spread it evenly on the glass in the car with a sponge, and wipe it off with a dry cloth after it dries, leaving no traces. Under normal circumstances, the effect can last for half a month.
After-sales staff Huang Baohua told reporters that this method is feasible because the detergent contains surfactants, which can change the surface tension of the water and make the fog droplets quickly condense into large water droplets, which can have an anti-fogging effect. “However, this is a preventive measure and must be dealt with in advance. If you wait until fogging is found, it will be too late.” Huang Baohua said.

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Monday, March 7, 2022

New tire technology: green travel to make the road silent

As we all know, noise is seriously disturbing our daily life, and traffic noise pollution is also a common phenomenon. As long as there is a sudden sound of a horn on the road and the noise of a tyre on the other side, you may have lost half of the good mood of the day. Coupled with the hot summer roasting, it is even more irritating. Have the car owners ever thought about starting from themselves, avoiding making noise, and being a silent roadster?

Cooper tires need to overcome difficulties to effectively deal with tire noise and improve driving comfort. Cooper’s ZEONC7 sedan tires adopt a technical coup of “blocking and dispersing”. Speaking of “blocking”, the method adopted by Cooper ZEONC7 sedan tires is to design “noise barriers” on both sides of the tread along the longitudinal direction. Inside the barrier, in order to achieve the effect of mute. When it comes to “scattering”, we have to mention the unique MCT memory comfort technology of Cooper Tire.

MCT memory comfort technology mainly relies on shock-absorbing layer and filler to function. Cooper ZEONC7 car tires increase the thickness of the shock-absorbing layer on the tread, which can more effectively disperse the impact of the road surface when the vehicle is driving, especially when the vehicle is driving across a bumpy road, the owner can clearly feel that the vibration is dispersed and filtered After the stability and mute effect, the comfort is improved. The rubber filler on the sidewall is designed to be softer and more elastic than before. After being impacted by the ground, it can quickly restore the previously memorized balance state and quickly bring the owner back to the original comfortable driving feeling. Before leaving the factory, Cooper ZEONC7 sedan tires are professionally tested compared with ordinary tires. The results show that under the same road conditions and the same vehicle conditions, the vibration amplitude of Cooper ZEONC7 sedan tires is significantly smaller and the vibration time is also significantly reduced.

It is the responsibility of each of us to create a quiet and civilized urban environment. Don’t let noise pollution continue to erode our symbiotic city. Cooper’s ZEONC7 car tires provide car owners with a green travel solution for silent driving, reduce noise pollution, and provide support for jointly creating a quiet and civilized urban living environment.

Link to this article:New tire technology: green travel to make the road silent

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Introduction to the correct choice of lubricating oil in summer

In the summer heat, not only the human body will have various adverse reactions, but also the car. Today, I will share with you one of the things you need to pay attention to in summer-lubricants.

The role of lubricating oil

The heat generated by the friction between the various moving bearing surfaces of the engine is second only to the heat when the engine cylinder is burned, and the lubricating oil takes the heat away by pressure lubrication, thus ensuring the normal operation of the friction surface. The heated lubricating oil returns to the oil pan through the oil passage for cooling. In terms of the structure of the engine, the oil pan is located under the engine*, and it is exposed to the air. It is generally made of materials with good thermal conductivity, and the lubricating oil is air-cooled through it. The cooled lubricating oil is sent to the lubricated surface again. The viscosity of the lubricating oil is very important for protecting the engine. Only when the lubricating oil has sufficient viscosity, can it be ensured that the oil film can be maintained between the engine parts at various temperatures, thereby protecting the normal operation of the engine.

Why pay attention to the viscosity of lubricating oil in high temperature in summer?

First of all, when the engine is running at high temperatures, the anti-oxidation stability of the lubricating oil deteriorates, which intensifies its thermal decomposition, oxidation and polymerization. At the same time, the dust in the dry air and the moisture in the humid air enter the engine oil pan through the air intake system and the crankcase vent to contaminate the lubricating oil, so the lubricating oil is prone to deterioration.

Second, the viscosity of lubricating oil changes with the increase of temperature, that is, the viscosity of lubricating oil decreases when it is heated, which easily causes excessive consumption of lubricating oil.

Third, when the engine is running at high temperature, the thermal expansion of metal parts is large, the normal fitting clearance between the parts becomes smaller, and the abrasion is intensified. At the same time, the engine running at high temperature adheres carbon deposits and colloids on the piston crown, combustion chamber wall, valve head and other parts, which makes the thermal properties of metal parts worse and accelerates the damage of the mechanical parts. In addition, due to the overheating of the engine, the oil becomes thinner, the oil pressure is reduced, and the lubricating oil film is not easy to form, which also accelerates the wear of the parts.

Reasonably choose lubricating oil viscosity

Lubricants are usually classified according to viscosity and quality. There are 6 types of oils in winter, 4 types of oils in summer, and 16 types of general-purpose oils in winter and summer. Summer lubricating oil grades are 20, 30, 40, and 50. The larger the number, the higher the viscosity and the higher the applicable temperature. For example: SAE15W-40, SAE5W-40. The number after “W” indicates the index of the high temperature resistance of the lubricant. The larger the value, the better the protection performance of the lubricant at high temperature. In general, consumers in most parts of the country from April to September can choose summer lubricants No. 15W-40 or No. 10W-40.

At the same time, for high-end cars, it is recommended to choose high-quality fully synthetic lubricants as much as possible. Compared with general mineral oil, synthetic oil has little change in viscosity with temperature, and it can still maintain a proper viscosity at high temperatures.

Lubricating oil is not that the higher the viscosity, the better

Although the viscosity of lubricating oil is very important, car owners should abandon the misconception that “the higher the viscosity, the better”, and choose the appropriate quality level according to the actual vehicle conditions, temperature and engine conditions. Only in the case of a large gap between the parts of the automobile engine, the lubricating oil with a large viscosity should be selected.

Using lubricating oil with excessive viscosity will have at least two disadvantages:

First of all, when the viscosity is higher than the degree that affects the engine start, it is likely to cause serious wear when the engine starts. Because the lubricating oil is too viscous and flows slowly, although the oil pressure is high, the throughput of the lubricating oil is not much, and it cannot be added to the friction surface in time. The oil circulation speed also slows down, and its cooling and heat dissipation effects will become poor, which will cause the engine to overheat. Due to the slow circulation of lubricating oil, the number of passes through the lubricating oil filter is reduced. Therefore, it is difficult to clean the worn-out metal chips, carbon particles, and dust from the friction surface in time.

Another disadvantage of using lubricating oil that is too viscous is energy consumption. Because the viscosity is too high, the friction between the friction surfaces of the parts increases. To overcome the increased friction, more fuel is consumed, resulting in a huge waste of energy. It is understood that low-viscosity lubricants have become an international trend in foreign countries. In China, although there are no compulsory requirements for energy-saving lubricants, low viscosity will be the future development trend.

Summary: In the high temperature in summer, the choice of lubricating oil is also a matter of great care. It is necessary to choose lubricating oil with higher viscosity, but also to abandon the misconception that “the higher the viscosity, the better”. If the choice is not good, the engine will be damaged in severe cases.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Sunday, March 6, 2022

“Registration Measures” to promote the development of the automobile market

The research report of the automobile registration method is reported by the Policy Research Association of China Automobile Manufacturers Association. Among them, the motor vehicle registration certificate with the function of the property right certificate can not be carried with the car, so in principle, it is not possible to conduct reselling fraud. This will not only reduce the car rental price, but also relieve the worries of many companies that want to start a car rental business, which is conducive to the development of the car rental industry. The Association of Automobile Manufacturers or the Association of Automobile Manufacturers will provide compensation to the demanders. The information is provided by the traffic control department for a fee. The “Registration Measures” laid a solid foundation for this statistical work.

Conducive to improving the quality of automobile products and promoting technological progress_Currently, China's policies and regulations are insufficient in promoting the quality of industrial products and technological advancement. Article 50 of the “Registration Measures” stipulates that the vehicle management office can entrust large-scale state-owned automobiles and motorcycles. , The exclusive sales store of the agricultural transport vehicle manufacturer shall handle the registration of the inspection-free motor vehicles produced by the enterprise on behalf of the vehicle management office. The specific measures shall be formulated separately. Only cars with good quality can be exempted from inspection, and cars with exemption from inspection can save vehicle inspection fees before registration. At the same time, dealers can directly apply for car licenses, which can save users the cost of entrusting motor vehicle registration and save money for car users. and time. Therefore, the sales of inspection-free vehicles in specialty stores will inevitably be better than those of non-inspection-free vehicles. It will effectively promote automobile manufacturers to improve product quality, speed up technological progress, and strive for vehicles to meet the inspection-free level as soon as possible.

is conducive to speeding up the process of automobile tax and fee reform. The issuance of motor vehicle registration certificates and the computer networking of motor vehicle registration management in the future provide convenience for the accurate statistics of various domestic motor vehicles according to equipment quality and engine displacement. Therefore, it provides a prerequisite for the future integration with international conventions and the implementation of vehicle tax. The implementation of vehicle tax is conducive to reasonable taxation, thereby promoting the development of the automobile market.

The automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Saturday, March 5, 2022

Approximate dry machining benefits from minimal lubrication

With the continuous development and technological progress in the field of metal processing, the concept of green processing has become more and more popular. The traditional lubrication cooling method using cutting fluid is gradually replaced by dry cutting technology. Because dry cutting also has defects for machining, it makes the machining quality drop and the cutting tool wears faster. Micro-lubrication technology emerged at the historic moment. The application of micro-lubrication technology improves the quality of machined parts and reduces tool wear. To a large extent, it solves the impact of dry cutting and will gradually become a technology that is compatible with dry cutting. The application of micro-lubrication technology will gradually replace the cooling and lubricating effects of cutting fluid.


The application of oil mist micro-lubrication technology can solve the lack of dry cutting without lubrication, improve the surface quality of processed workpieces under dry cutting conditions, reduce the wear of cutting tools, and extend the service life.


During metal processing, cooling and lubrication is an important aspect related to product accuracy and quality. While the same product quality can be achieved, the overall processing cost should be reduced as much as possible, and the production efficiency should be improved. For the processing of small-sized parts, the parts themselves have good heat dissipation, and the spraying method using a large amount of cutting fluid is undoubtedly a waste of energy. The application of micro-lubrication technology is to provide the amount of lubrication as needed, avoiding the waste of over-lubrication, and achieving controllable and reduced costs.


However, with the increase in environmental protection requirements of industrial enterprises, the impact of the lubrication method of pouring cutting oil on the environment and human health has been paid more and more attention. At the same time, the cost of using cutting oil and the treatment of waste liquid are not small for enterprises. Expenditures also virtually affect the competitiveness of enterprises.


Doppelt adapts to the trend of green development in the machinery industry, and continuously introduces micro-lubrication products that meet the needs of various machining processes. The application of micro-lubrication technology in metal processing will bring more benefits to enterprises. We are willing to welcome the green with you. Revolution of manufacturing.

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The traction converter of the high-speed EMU adopts a fully enclosed circulating water cooling system

 

The heat dissipation capacity of the cooling system of the traction converter directly affects whether the converter can work safely and stably for a long time. For the cooling system of the traction converter of the CRH3 EMU, the dimensions and boundary conditions required for model simulation are obtained by actual measurement and dynamic test tests, ensuring the authenticity of the simulation analysis. Using ANSYS/FLOTRAN to simulate the flow field and temperature field of the heat exchanger of the traction converter cooling system in three dimensions. Compared with the previous empirical simplified formula method or experimental measurement method, it avoids the problems of poor calculation accuracy and difficult measurement. The distribution of wind speed, pressure and temperature of the heat exchanger of the cooling system can be easily and clearly obtained. By comparing and designing the temperature change of the coolant inlet and outlet pipes, the heat dissipation power of the converter cooling system is calculated, which provides a reliable basis for the performance evaluation and structural improvement of the CRH3 traction converter cooling system.

Traction converter cooling system structure The CRH3 high-speed EMU traction converter adopts a fully enclosed circulating water cooling system. The cooling system consists of an expansion tank, a water pump, a water-air heat exchanger, a cooling module, a pipeline, etc. The cooling medium is a mixture of high-purity water and antifreeze. Traction converter filter cutoff valve fan heat exchanger, quick connector expansion tank water pump pressure sensor temperature sensor, pressure sensor temperature sensor cutoff valve, traction converter cooling system working principle, the cooling medium is pumped to the main converter by the water pump In the heat exchanger outside the device, part of the cooling medium flows from the heat exchanger to the expansion tank, and the remaining part of the cooling medium flows back to the main converter after being cooled by the heat exchanger, flows into the 8 phase component modules connected in parallel, and communicates with the power device. Heat exchange; then it is pumped out by the water pump, and then pumped to the heat exchanger by the water pump, and so on.

For automotive parts and parts machining, PTJ Shop offers the highest degree of OEM service with a basis of 10+ years experience serving the automotive industry. Our automotive precision shop and experts deliver confidence. We have perfected the art of producing large component volumes with complete JIT reliability, backed by the quality and long-term reliability our customers expect.

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Do 3D Printing And CNC Machine Coexist Or Compete?

Many countries in the world have cultivated 3D printing as a new growth point for future industrial development. As early as 2012, the United States identified “Additive Manufacturing Technology” as the first manufacturing innovation center (later renamed “Made in the United States”), and the European Union, South Korea, Japan, Singapore, Russia and other countries also adopted various measures to promote 3D printing China Industry moving forward

Since the rise of 3D printing, China has successively promulgated a number of policies to support the development of the 3D printing industry. With the support of policies, 3D printing companies have sprung up like mushrooms after a rain, and are growing rapidly. The development of the 3D printing industry in Beijing, Guangdong, Zhejiang, Shaanxi and other places has also made significant progress. According to statistics, there are more than 400 companies engaged in 3D printing business in Guangdong Province alone, with multiple 3D printing industrial parks.

With the rapid development of 3D printing, whether traditional subtractive manufacturing methods such as Cnc Machine tools will be replaced has also become a hot topic of discussion among people from all walks of life. In recent years, the technology of China’s CNC machine tools has been improving day by day, and 3D printing has found their own scenes. Generally speaking, CNC machine tools need to program in advance and continuously cut to realize the forming of objects. The working principle of a 3D printer is similar to that of a CNC machine tool, and it also works according to computer instructions. The difference is that it builds products by stacking layers of raw materials. So 3D printing is also called “additive manufacturing.”

The significant difference between 3D printing and traditional manufacturing lies in the process of product molding. In the traditional manufacturing industry, the entire manufacturing process generally needs to be formed through such processes as mold opening, cutting, casting or forging, and component assembly. 3D printing eliminates complicated processes, no molds, and one-time molding. Therefore, 3D printing can overcome some designs that cannot be achieved in traditional manufacturing and produce more complex structures.

On the other hand, CNC machine tools are a type of computer numerical control (CNC), which can process complex, precise, and various parts. Generally speaking, CNC machining tools use computer-designated programs to remove excess materials through laser cutting, milling and other steps to reach the final product, which is a typical subtractive manufacturing.

On the one hand, traditional manufacturing is characterized by “global procurement, division of labor and collaboration”. Different parts of a product are often produced in different places and then shipped to the same place for assembly. And 3D printing is “integral manufacturing, one-time molding”, which eliminates the logistics link and saves cost and time.

On the other hand, the traditional manufacturing industry takes production lines as the core, factories as the main carrier, and highly concentrated production equipment. And 3D printing embodies the integration of a new generation of information technology and manufacturing represented by cloud computing, big data, Internet of Things, and mobile Internet.

As a major product of the development of traditional manufacturing, machine tools are very different from the new generation of 3D printing manufacturing methods. The machine tool is the mother machine of the manufacturing industry. If 3D printing technology can be integrated into the machine tool field, it will undoubtedly be even more powerful. The combination of the two not only improves the production efficiency, but also completes many manufacturing problems.

The special machine tool in the machine tool can be customized with functions according to customer requirements, but the functions are not powerful enough and rich, and may not be designed and manufactured as one wishes. However, with the introduction of 3D printing, the popularity and application of machine tool products may be greatly improved.

It is understood that 3D printing technology has already been applied in China’s industrial parts manufacturing, but has not yet entered large-scale industrial applications. Its process and equipment, as well as applications in medical, aerospace and other fields need to be further developed. Judging from the current situation, 3D printing technology does not have the conditions to replace traditional manufacturing. In terms of mass manufacturing, the high-efficiency and low-cost traditional subtractive manufacturing method embodied by machine tool manufacturing is even better.

Of course, with the emphasis on metal additive manufacturing, more and more equipment manufacturers in the field of traditional machine tool manufacturing have entered the field of additive manufacturing. Some have launched hybrid additive manufacturing equipment based on Cnc Machining centers, and some simply Directly enter the new field of additive manufacturing. For example, Japanese Mazak. Mazak launched the Integrex i-400am (additive manufacturing) compound processing equipment. Integrex i-400am is a complete set of equipment, which is more suitable for processing materials for small batch production, such as the processing of heat-resistant alloys for aerospace parts, and the processing of high-hardness materials for parts.

The long-term coexistence of subtractive manufacturing and growth manufacturing methods is a trend that can be met. However, in the future, this situation may change. In any case, the way to achieve refined, automated, and efficient manufacturing of products will be expected to be diversified.

Do 3D Printing And CNC Machine Coexist Or Compete?

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