Thursday, June 10, 2021

Knowledge of aluminum processing technology

Aluminum is the most widely used and widely used metal material among non-ferrous metals, and its application range is still expanding. There are many kinds of aluminum products produced using aluminum, and there are more than 700,000 types according to statistics. Various industries such as construction and decoration, transportation, and aerospace have different needs. Today I will introduce to you the processing technology of aluminum products and how to avoid processing deformation.

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Monday, June 7, 2021

Sunday, June 6, 2021

CM200DU-24H

Mitsubishi CM200DU-24H

#CM200DU-24H Mitsubishi CM200DU-24H New IGBT: 200A1200V; POWEREX CM200DU-24H IGBT MODULE 1.2KV 200A MODULE , CM200DU-24H pictures, CM200DU-24H price, #CM200DU-24H supplier

 CM200DU-24H
Collector Emitter Saturation voltage Vce(on): 1.2kV
Collector Emitter Voltage V(br)ceo: 1.2kV
DC Collector Current: 200A
No. of Pins: 7
Operating Temperature Max: 150°C
Power Dissipation Pd: 1.13kW
SVHC: To Be Advised
Transistor Case Style: Module
Transistor Polarity: N Channel

IGBT: 200A1200V; POWEREX CM200DU-24H IGBT MODULE 1.2KV 200A MODULE

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Wednesday, June 2, 2021

What should I pay attention to in the die casting of aluminum alloy?

Aluminum alloy die-casting products are mainly used in electronics, cars, motors, and some communication industries. Of course, the primary use is still in the parts of some equipment. So what should we pay attention to in the die-casting of aluminum alloy?

 

1. Consider the issue of demolding,

 

2. Considering the wall thickness of aluminum alloy die-casting, too much thickness will affect the filling

 

3. In the structure, try to avoid the appearance of the structure that causes the mold structure to be messy, and have to use multiple core pulling or spiral core pulling

 

4. The appearance of some die castings may have special requirements, such as oil injection

 

5. Consider the mold problem when designing. Assuming there are multiple orientations of core-pulling positions, try to put both ends, preferably not in the lower position of the core-pulling, so that the aluminum alloy die-casting will cause problems with the core-pulling.

 

Pay special attention to the following points in the use of aluminum alloy die-casting molds:

 

1. It is very troublesome to organize the parting surface of the mold, and it is also very simple to ignore. Assuming that the boss has a high starting point and buys a good mold, then the job is much easier. If the quality of the mold is not good, it is produced. It is inevitable that there will be flashes or dirt on the parting surface of the mold. The operator should always tidy up these parts and equip a small spatula at any time.

 

Assuming that the flash is not removed in time, the parting surface of the mold is simply collapsed, and the aluminum is formed in the production process. Once this result is formed, no matter how good a mold repair expert you are, the possibility of complete repair is very small. Yes, it's not that they don't have the skills.

 

 

 

The emergence of the achievements made by running aluminum not only increases the cost of die-casting, wastes the aluminum in vain, and the product quality is also unstable, especially the internal quality. It also increases the difficulty of confirming the process parameters, and the pass rate will drop a lot. From safety considerations, Increased the chance of work-related injuries.

 

During the shift, the operator thoroughly cleans the parting surface of the mold with kerosene, which not only prevents the mold from being crushed, but also after cleaning, the mold can be blocked by the residue of the release agent or other dirt. The exhaust groove is opened, which is conducive to the discharge of the gas in the cavity during the injection process to advance the product quality. It is advisable for a team to clean the parting surface twice. Let employees develop an outstanding habit.

 

2. When each team takes over, check carefully according to the "Mold Check List" of our company, and solve the problems in time to avoid unnecessary troubles for themselves.

 

3. Application of mold cooling system. When the mold cooling water is used correctly, it not only extends the service life of the mold, but also improves the metal machining efficiency. In actual production, we often neglect its importance. The operators also try to save energy. If it is too troublesome to connect and connect, they will not connect the cooling water pipe. Some companies even save the cost when customizing the mold. Cooling water then constitutes a very serious result.

 

The material of the mold is generally made of special mold steel through various treatments, and even the best mold steel has its limits of use, such as temperature. When the mold is in use, assuming that the mold temperature is too high, it is very simple that tortoise cracks appear on the surface of the mold core early, and some molds even have large areas of tortoise cracks before they exceed 2000 times.

 

Even during the production of the mold, the color of the mold core changed because the mold temperature was too high. After measurement, it even reached more than 400 degrees. When this temperature is quenched by the release agent, it is very easy to crack, and the product is produced. It is also briefly deformed, strained, sticky and other conditions appear.

 

Under the condition of using mold cooling water, the use of mold release agent can be greatly reduced, so that the operator will not use mold release agent to lower the temperature of the mold. The advantage is that it can effectively extend the life of the mold, save the die-casting cycle, improve the quality of the product, reduce the occurrence of mold sticking, strain and aluminum sticking, and reduce the use of mold release agents. It can also reduce the loss of ejector pins and cores due to overheating of the mold.

 

4. It is necessary to preheat the mold during the initial production machining to avoid the occurrence of turtle cracks when the cold mold suddenly encounters hot molten metal. The messy mold can use blowtorch and liquefied gas, and the conditions are good. For the mold temperature machine, the simpler mold can be preheated by slow injection.

 

5. Assuming that the mold is equipped with neutron control, be careful to prevent the signal line between the die casting machine and the mold from being connected. The reason is very clear. In daily production, it is difficult to avoid water on the signal line, which may be caused by the joints. The local is simply broken.

 

Then the composition is short-circuited with the machine tool. If a signal error is formed, it will alarm and proactively stop and delay the time, or the signal will be disordered and the mold will be broken. Constitute unnecessary discards. Pay attention to the waterproof of the travel switch.


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Tuesday, June 1, 2021

CNC turning and milling composite processing manufacturers explain the selection of lathes


1. Preparation

 

The CNC turning and milling composite processing manufacturer introduced the process requirements of typical parts and the batch of processed workpieces. The function that the CNC lathe should have is to make preparations and the prerequisites for the reasonable selection of CNC lathes. Meet the process requirements of typical parts

 

The process requirements of typical parts are mainly the structural size, processing range and accuracy requirements of the parts. According to the accuracy requirements, that is, the dimensional accuracy, positioning accuracy and surface roughness of the workpiece, the control accuracy of the CNC lathe is selected.

 

Choose based on reliability. Reliability is a guarantee for improving product quality and production efficiency. The reliability of a CNC machine tool means that the machine tool runs stably for a long time without failure when it performs its functions under specified conditions. That is, the mean time between failures is long, even if there is a failure, it can be restored in a short time and put into use again. Choose machine tools with reasonable structure, well-manufactured, and mass-produced machines. Generally, the more users, the higher the reliability of the CNC system.

 

2. Purchase of machine tool accessories and tools

 

According to the analysis of CNC turning-milling composite processing manufacturers, the machine tool accessories, spare parts and their supply capacity, and cutting tools are very important to the CNC machining and turning centers that have been put into production. When choosing a machine tool, carefully consider the compatibility of tools and accessories.

 

3. Focus on the identity of the control system

 Manufacturers generally choose products from the same manufacturer, and should at least purchase control systems from the same manufacturer, which brings great convenience to the maintenance work. Teaching units require students to be knowledgeable and knowledgeable, so it is a wise choice to choose different systems and equip them with various simulation software.

 

4. Choose according to the performance-price ratio

 Introduced by CNC turning-milling composite machining manufacturers, to ensure that the functions and accuracy are not idle, not wasted, and do not choose functions that are not related to your needs.


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Introduction to the method of aluminum alloy die casting to solve casting porosity

Method to solve casting porosity

 

First analyze the reasons for the formation of stomata, and then take corresponding measures.

 

(1) Choose dry and clean alloy materials.

 

(2) Do not overheat or degas the melt under control.

 

(3) Reasonably choose the casting process parameters, especially the injection speed. The starting point for speed-regulating high-speed machining.

 

(4) Sequential filling helps to discharge the cavity gas. Pouring I: 1, and the runner has sufficient length. It should be 50 ram, which is conducive to the smooth flow of alloy liquid and gas discharge.

 

The thickness and direction of I:1 can be changed, and overflow grooves and exhaust grooves are set at the holes. The sum of the cross-sectional area of ​​the overflow product is not less than 60% of the sum of the cross-sectional area of ​​the gate part, otherwise the slag discharge effect will be poor.

 

(5) Choose good performance paint and spray volume control.

 

Choose the right die casting machine

 

 

 

Die-casting machine is the key equipment for die-casting production, and its performance objectively determines the quality of die-casting parts. The correct choice of die-casting machine is essential to ensure product quality, improve production efficiency and reduce production costs. The performance of the die casting machine depends on two aspects.

 

Sufficient clamping force: to prevent the flow pressure of the molten metal from reaching high peaks, and to prevent flashing and flying materials.

 

Sufficient injection capacity: to ensure that the stand casting process will not cause overheating or a large amount of overflow of the mold, and at the same time ensure that the machine has enough capacity to transport enough molten metal and fill the cavity as required to accelerate the speed in a short time.

 

Design of Die Casting Mould Runner

 

Because the zinc alloy must fill the cavity in a short time, the design and manufacturing of the die-casting mold and its runner system are much higher than that of the plastic mold.

 

The runner system guides the metal solution to fill the cavity in some way. It plays an important role in the flow direction of the metal liquid, pressure transmission, filling time, exhaust conditions and mold temperature distribution.

 

It is also an important factor that determines the quality of die castings.

 

The design principle of the die-casting mold runner system should be summarized from the gooseneck to the gate to avoid sharp corners, and the runner surface should be smooth to reduce resistance and maintain the flow rate of the liquid zinc alloy.


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Sunday, May 30, 2021

CM150DU-24F

Mitsubishi CM150DU-24F

#CM150DU-24F Mitsubishi CM150DU-24F New 150A/1200V/IGBT/2U;IGBT MOD DUAL 1200V 150A F SER , CM150DU-24F pictures, CM150DU-24F price, #CM150DU-24F supplier
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Email: sales@shunlongwei.com 

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CM150DU-24F
Category Discrete Semiconductor Products
Family IGBTs – Modules
Manufacturer : Powerex Inc.
Series IGBT MOD™
IGBT Type Trench
Configuration Half Bridge
voltage – Collector Emitter Breakdown (Max) 1200V
Current – Collector (IC) (Max) 150A
Power – Max 600W
Vce(on) (Max) @ Vge, IC 2.4V @ 15V, 150A
Current – Collector Cutoff (Max) 1mA
Input Capacitance (Cies) @ Vce 59nF @ 10V
Input Standard
NTC Thermistor No
Mounting Type Chassis Mount
Package / Case Module
Supplier Device Package Module
 

150A/1200V/IGBT/2U;IGBT MOD DUAL 1200V 150A F SER

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Saturday, May 29, 2021

G084SN05 V3

AUO G084SN05 V3

#G084SN05 V3 AUO G084SN05 V3 New AUO 8.4inch Panel 800×600 500:1 262K CCFL LVDS , G084SN05 V3 pictures, G084SN05 V3 price, #G084SN05 V3 supplier
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Email: sales@shunlongwei.com sales[email protected]

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Panel Brand : AUO
Panel Model : G084SN05 V3
Panel Type : a-Si TFT- LCD , Panel 
Panel Size : 8.4 inch
Resolution : 800(RGB)×600 , SVGA 
Display Mode : TN, Normally White, Transmissive 
Active Area : 170.4×127.8 mm
Outline : 203×142.5 mm
Brightness : 450 cd/m² (Typ.) 
Contrast Ratio : 500:1 (Typ.)  
Display Colors : 262K   (6-bit)
Response Time : 10/25 (Typ.)(Tr/Td) 
Viewing Angle : 60/60/60/40 (Typ.)(CR≥10) (L/R/U/D) 
Frequency : 60Hz  
Lamp Type : 2 pcs CCFL   
Signal Interface : LVDS (1 ch, 6-bit)  
Input voltage : 3.3V (Typ.) 

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FP40R12KT3

Eupec FP40R12KT3

#FP40R12KT3 Eupec FP40R12KT3 New IGBT Modules N-CH 1.2KV 55A, FP40R12KT3 pictures, FP40R12KT3 price, #FP40R12KT3 supplier
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Email: sales@shunlongwei.com [email protected]

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FP40R12KT3 FP40R12KT3
Manufacturer: Infineon
Product Category: IGBT Modules
RoHS: YES
Product: IGBT Silicon Modules
Configuration: Hex
Collector- Emitter voltage VCEO Max: 1200 V
Continuous Collector Current at 25 C: 55 A
Maximum Operating Temperature: + 125 C
Package / Case: Econo 2
Packaging: Tray
Brand: Infineon Technologies
Maximum Gate Emitter Voltage: +/- 20 V
Minimum Operating Temperature: – 40 C
Mounting Style: Screw
Factory Pack Quantity: 10
 

IGBT Modules N-CH 1.2KV 55A

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BSM15GD120DN2E3224

Eupec BSM15GD120DN2E3224

#BSM15GD120DN2E3224 Eupec BSM15GD120DN2E3224 New IGBT Modules N-CH 1.2KV 25A , BSM15GD120DN2E3224 pictures, BSM15GD120DN2E3224 price, #BSM15GD120DN2E3224 supplier
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Email: sales@shunlongwei.com

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BSM15GD120DN2E3224
Manufacturer: Infineon
Product Category: IGBT Modules
RoHS: YES
Product: IGBT Silicon Modules
Configuration: Hex
Collector- Emitter voltage VCEO Max: 1200 V
Collector-Emitter Saturation Voltage: 2.5 V
Continuous Collector Current at 25 C: 25 A
Gate-Emitter Leakage Current: 150 nA
Maximum Operating Temperature: + 150 C
Package / Case: EconoPACK 2
Brand: Infineon Technologies
Maximum Gate Emitter Voltage: 20 V
Minimum Operating Temperature: – 40 C
Mounting Style: Screw
Pd – Power Dissipation: 145 W
Factory Pack Quantity: 10

IGBT Modules N-CH 1.2KV 25A

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Mitsubishi CM50MD-12H

Mitsubishi CM50MD-12H Technical Infomation

#CM50MD-12H Mitsubishi CM50MD-12H New PIM: 50A600V, CM50MD-12H pictures, CM50MD-12H price, #CM50MD-12H supplier

CM50MD-12H Description

IGBT Power Module, CIB Module Three Phase Converter Three Phase Inverter Brake 50 Amperes/600 Volts, IGBT POWER TRANSISTOR MODULES MEDIUM POWER SWITCHING USE INSULATED TYPE

CM50MD-12H  0.22 lbs

Target_Applications

CM50MD-12H could be used in AC & DC motor controls, General purpose inverters, Servo drives, NC, Robotics

Features

IGBT POWER TRANSISTOR MODULE
PIM: 50A600V

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AUO G121XN01 V1

AUO G121XN01 V1

#G121XN01 V1 AUO G121XN01 V1 New G121XN01 V1 AUO 12.1″ LCM 1024×768 500 700:1 80/80/80/80 16.7M WLED eDP, G121XN01 V1 pictures, G121XN01 V1 price, #G121XN01 V1 supplier

Brand AUO
Model G121XN01 V1
Diagonal Size 12.1 inch
Type a-Si TFT-LCD, LCM
Pixel Format 1024(2)×768(2)  [XGA]  105PPI
Configuration RGBW Rectangle
Active Area 245.76(H)×184.32(V) mm
Luminance 500 cd/m² (Typ.)
Contrast Ratio 700:1 (Typ.) (TM)    
Response Time 25/10 (Typ.)(Tr/Td)
Viewing Angle 80/80/80/80 (Typ.)(CR≥10) Left / Right / Up / Down
Operating Mode TN, Normally White, Transmissive
Support Color 16.7M   72% NTSC
Light Source WLED , 50K hours
Designed For Industrial
Frame Rate 60Hz 
120Hz (60HZ Input) : Embedded MEMC Circuit
120Hz+120Hz : 120Hz Panel+120Hz Backlight
240Hz (60HZ Input) : Embedded MEMC Circuit
Touch Panel Without
Interface Type eDP
Environment Operating Temperature: -30 ~ 85 °C ; Storage Temperature: -30 ~ 85 °C

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Thursday, May 27, 2021

Semikron SKM300GB12T4

Semikron SKM300GB12T4

 Semikron SKM300GB12T4

#SKM300GB12T4 Semikron SKM300GB12T4 New IGBT4 = 4. Generation (Trench)IGBT 1200V/300A, SKM300GB12T4 pictures, SKM300GB12T4 price, #SKM300GB12T4 supplier
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Email: sales@shunlongwei.com https://www.slw-ele.com/skm300gb12t4.html

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SKM300GB12T4

Features
• IGBT4 = 4. Generation (Trench)IGBT
• VCEsat with positive temperature coefficient
• High short circuit capability, self limiting to 6 x ICNOM
• Soft switching 4. Generation CAL diode (CAL4)
Typical Applications
• AC inverter drives
• UPS
• electronic welders at fsw up to 20 kHz Remarks
• Case temperature limited to  Tc = 125°C max, recomm.
 Top = -40 … +150°C, product rel. results valid for Tj = 150°C

Maximum ratings and characteristics 
.Absolute maximum ratings (Tc=25°C unless without specified)
Collector-Emitter voltage Vces:1200V
Gate-Emitter voltage VGES:±20V
Collector current IC:300A
Collector current Icp:900A
Collector power dissipation Pc:1800W
Collector-Emitter voltage VCES:4000V
Operating junction temperature Tj:+150°C
Storage temperature Tstg :-40 to +125°C
Mounting screw torque 3.5 *1 N·m

IGBT4 = 4. Generation (Trench)IGBT 1200V/300A

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Tuesday, May 25, 2021

Helmet

Helmet  (Device To Protect The Head)

Helmet is a device to protect the head, a hat worn by soldiers during training and combat, and an indispensable tool in people's traffic. Divided into military helmets, police helmets and civilian helmets. It is mostly semi-circular, mainly composed of three parts: shell, lining and suspension device. The shells are made of special steel, glass fiber reinforced plastic, reinforced plastic, leather, nylon and other materials to resist head damage from warheads, shrapnel and other striking objects.

Constitute
Modern helmets are mainly composed of helmet shell, lining and suspension system. Due to the different requirements for various activities, there are many helmet structures and styles.

Generally, the shell of the helmet is made of high-strength materials, such as metal, engineering plastics, Kevlar FABRIC, etc., through its deformation to absorb most of the impact; the lining material is sweat-absorbing, warm-keeping, and shock-absorbing Functional, military helmets often have the function of further reducing the impact and preventing shell fragments from hurting the head; the suspension system is the part between the shell and the inner lining, which can usually be adjusted to suit different wearers. The difference in head shape.

Some special-purpose helmets are also equipped with earphones, microphones, and sockets for additional equipment such as cameras and lighting flashlights.

Application
Helmets are used in military, construction, mining and some sports, such as American football, cycling, baseball, skiing, ice hockey, horse racing, equestrianism, sports, racing, locomotives, etc.

How to wear a helmet

The helmet should be worn horizontally, not tilting forward or backward. Some riders think that the front brim of the helmet is a bit blocking the line of sight, so they raise the helmet a lot to get a good line of sight. In fact, the brim can be removed to achieve the effect.

  

The correct helmet to wear is as follows:
Pay attention to the red and green dots on the picture. This is very important. The correct wearing of the helmet is the thickness of one finger of the helmet adjustment strap that crosses the ear (red dot), about 1.5 cm.
The entire strap is fixed on the lower jaw (green dot) instead of the throat, and the thickness of a finger is also left, about 1.5 cm.

 

Tips

1. The lighter the helmet, the better
Relatively speaking, the lighter the helmet, the better. But the lighter the riding helmet, the smaller the chance that it will pass the national safety certification test standards, and the higher the relative price. Therefore, the prerequisite for choosing a helmet is to pass the national safety certification test standard. Most helmets above 200 yuan can achieve about 260G. This weight will not make you tired even for a long distance, so don't care too much about the weight index of the helmet. Unless you are for a bicycle race. Try to reduce your own weight, otherwise, it is not worth the extra silver to buy an ultra-lightweight helmet.

2. The bigger or more holes in the helmet, the more windy the helmet
Breathability is the key to the helmet, which can keep your head dry during long-distance riding. The more or larger the ventilation holes on the helmet, the greater the airflow around your head, and the cooler you will feel. However, please keep in mind that the more or larger the ventilation holes on the helmet, the more exposed your head will be, so the degree of protection will be reduced accordingly. Compared with mountain bike helmets, road bike helmets have more or larger ventilation holes. Similarly, road bikers have to consider the weight of their helmets more than mountain bikers. Generally speaking, the lighter the helmet, the more expensive it is. Therefore, unless you are doing a bicycle race, you should reduce your own weight as much as possible, otherwise, it is not worth the extra money to buy an ultra-lightweight bicycle helmet.

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Monday, May 24, 2021

The contribution of CNC machining to the rapid development of mobile phones

The mobile phone can be said to be an indispensable electronic product in our daily life. It has promoted the development of our communication era. But did you know that many parts of mobile phones are made by CNC precision parts processing manufacturers? So how much role does CNC precision parts processing team play in our mobile phone manufacturing? Let's take a look at the effect of CNC precision parts processing on mobile phone manufacturing.

Take the iPhone manufactured by Foxconn. IPhone can be said to be a very popular mobile phone brand, and the IPhone body is generally made of aluminum alloy frame, whether it is 5S or IPhone XS Max after 6S, it is aluminum alloy body, and the aluminum alloy body is precision CNC Precision machining by lathe. Almost all the aluminum alloy shells of brand mobile phones are made by precision processing, because this kind of shell is more beautiful, smooth and drop resistant than ordinary shells.

So is it only related to the processing of the mobile phone shell and CNC precision parts? In fact, there are many parts that we can't see, and they are inseparable from CNC precision parts cnc machining. For example, very small screw caps in mobile phones are customized according to the needs of mobile phone manufacturers. There are almost no standards, and the requirements for precision are very high. Therefore, almost all standards are produced by CNC precision parts processing, and many parts such as silver needles in mobile phones are produced by CNC precision parts processing.



Mainly, the four principles followed in the process of CNC precision parts processing have brought good results to the mobile phone shell. details as follows:

1. Benchmark first

In other words, the datum plane must be processed first. In the processing process, the surface as the positioning reference must be processed first in order to provide a precision reference for subsequent processing as soon as possible.

2. Division of processing stages

The appearance of high processing quality can be divided into three stages: rough processing, semi-finishing and finishing. Its main purpose is to ensure processing quality; facilitate the scientific application of equipment; facilitate the arrangement of heat treatment processes; facilitate the detection of blank defects.

Third, the front surface of the hole

For parts such as boxes, brackets, connecting rods, etc., the plane should be machined before the holes are machined. In this way, the holes can be machined and die casting  by plane positioning, which ensures the position accuracy of the plane and the holes, and facilitates the processing of the holes on the plane.

Four, complete

The finishing of the main surface, such as grinding, honing, finishing, rolling, etc., should be placed at the end of the process route. The general principles of precision parts processing routes and the formulation of precision parts processing procedures can be divided into two parts. First determine the process route of the part processing, and then determine the process size of each process, the equipment and process equipment used, the amount of cutting, the quota of working hours, etc.

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LCD

LCD (Liquid Crystal Display) Liquid Crystal display. The structure of LCD is to place a liquid crystal cell between two parallel Glass substrates. The lower substrate Glass is equipped with TFT (thin film Transistor), and the upper substrate glass is equipped with a color filter. The signal and voltage on the TFT are changed to control the liquid crystal molecules. Rotate the direction, so as to achieve the display purpose by controlling whether the polarized light of each pixel point is emitted or not. LCD has replaced CRT as the mainstream, and the price has dropped a lot, and it has been fully popularized.
A few days ago, according to data from CINNO Research, 2020 is expected to be the first year of mass production and launch of fingerprint recognition mobile phones under the LCD screen.

LCD Type
According to the different Backlight sources, LCDs can be divided into two types: CCFL displays and LED displays.
Misunderstanding:
Many users believe that liquid crystal displays can be divided into LEDs and LCDs. To some extent, this understanding is misguided by advertisements.


The LED display on the market is not a true LED display. To be precise, it is an LED-backlit liquid crystal display. The liquid crystal panel is still a traditional LCD display. In a sense, this is somewhat fraudulent. nature! South Korea's Samsung was once convicted by the British Advertising Association as violating the country's advertising laws because its "LED TV" LCD TVs were suspected of misleading consumers. For liquid crystal displays, the most important key is the type of liquid crystal panel and Backlight, while the liquid crystal panels of displays on the market generally use TFT panels, which are the same. The difference between LED and LCD is only their backlight type: LED The backlight and CCFL backlight (that is, fluorescent lamps) are Diodes and cold cathode lamps, respectively.

LCD is the acronym for Liquid Crystal Display, which means "liquid crystal display", that is, liquid crystal display. The LED display refers to a type of liquid crystal display (LCD), that is, a liquid crystal display (LCD) with LED (light emitting Diode) as the backlight source. It can be seen that LCD includes LEDs. Corresponding to the LED display is actually a CCFL display.
(1) CCFL
Refers to a liquid crystal display (LCD) with CCFL (Cold Cathode Fluorescent Lamp) as the backlight source.
The advantage of CCFL display is good color performance, but the disadvantage is higher power consumption.
(2) LED
Refers to a liquid crystal display (LCD) that uses LEDs (light emitting Diodes) as a backlight source, and generally refers to WLEDs (white light LEDs).

The advantages of LED displays are small size and low power consumption. Therefore, using LEDs as a backlight source can achieve high brightness while taking into account lightness and thinness. The main disadvantage is that the color performance is worse than that of CCFL monitors, so most professional graphics LCDs still use traditional CCFL as the backlight source.

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Friday, May 21, 2021

Advanced laser technology: a weapon to improve the level of automobile manufacturing

In recent years, with the continuous progress of science and technology, advanced manufacturing technology represented by laser technology is continuously promoting the upgrading and innovation of the automobile manufacturing industry, and its application in automobile processing has become more and more extensive. Compared with traditional manufacturing technology, laser technology has many advantages such as non-contact processing, high precision, high flexibility, high efficiency, high automation and strong adaptability. It is used in the fields of cutting, welding, marking and surface treatment. Shine. This article focuses on the rapid development of diversified automotive varieties and the rapid transformation of automotive sheet demand from large-scale to customized production. It focuses on the current status and trends of automotive sheet laser high-speed blanking, body-in-white laser online welding, and automotive parts welding in automotive applications. .

 

High-speed laser cutting and blanking of automotive plates

 

As we all know, the core development trends of laser cutting in the future mainly include high precision, high speed, high power, large thickness, wide format, and three-dimensional cutting and special material cutting. At present, in the field of laser cutting, fiber laser cutting has highlighted a series of advantages: the power continues to increase, the thickness of the processed sheet continues to increase, and the cutting speed is getting faster and faster (up to 100m/min), which not only greatly shortens the production preparation cycle , At the same time, the workshop has realized a high degree of flexibility, and the processing area has been reduced by half. Compared with traditional machining methods, the cost of laser processing is reduced by 50%.

 

 

Nowadays, the demand for the amount of automotive panels is becoming stronger and stronger, and the rapid development of the automotive industry has also put forward demands for more and more professional automotive panel blanking production lines. The demand for automotive panels must be transformed from large-scale to customized production. Among them, the key is the need to use chinese laser cutting to process automotive panels.

 

 

If the existing mechanical processing method is adopted, the price of a single piece of equipment is about 70 million yuan, the cost of mold opening for a single set of molds is about 2.2 million yuan, and the mechanical mold opening time is about 1-2 months. At the same time, the design is facing challenges: complex shapes are difficult to blank and form.

 

 

With the continuous development of high-performance optical fiber technology, it has continuously promoted the advent of new automotive sheet blanking production lines.

 

 

Body-in-white online welding

 

The welding of automobile body-in-white is regarded as an important link in the automobile production process. The welding quality of the body-in-white is directly related to the quality and service life of the entire vehicle. Because china laser cutting service has the advantages of non-contact processing, high energy density, small deformation, narrow heat-affected zone, high welding speed, easy automatic control, no subsequent processing, etc., compared with traditional welding methods, the use of body-in-white laser welding is greatly improved Improve the efficiency of automobile manufacturing and reduce its production costs.

 

 

Feiyue Laser Factory has jointly developed a series of tailored welding systems for automotive panels with Shenlong Automobile and other strategic partners. For example, the welding system for the top of automotive panels can complete the welding of 1.4 meters in length in 13 seconds; when different models When carrying out flexible mixed-flow production, the auto-switching time of production line models is less than 40 seconds. Another example: the production line for car body welding and forming, which consists of 2 car body floor fixtures, 1 car body transmission system, 1 car body lifting device, 8 spot welding robots, 16 robot gripper net frame fixtures, and 16 positioning and locking devices And other elements. In addition, the top cover laser welding production line consists of two robot units, fiber lasers, wire feeders, welding heads, laser protection rooms and floor fixtures. There is a quick-change device between the top cover fixture and the robot, which can quickly realize multi-model tooling switching.

 

 

From the perspective of welding process research, the following aspects are areas that need to continue to increase research and development efforts: stability control of the welding process, weld defect control, weld shape and organization control, complex structure welding process control and new laser cutting technology.

 

 

Laser welding of auto parts

 

In addition to body-in-white welding and tailor-made welding of automotive panels, laser welding is also very useful in the processing of automotive parts. Undoubtedly, laser welding technology has now become one of the most advanced automobile manufacturing processes. In developed industrial countries in the West, more than 60% of auto parts are processed by laser welding technology, such as airbags and car seat adjustments. Laser technology can be found in the manufacturing process of various auto parts such as angle gears, seat slides, trunks, gears and transmissions. At the same time, laser welding has demonstrated advantages in helping auto parts achieve efficiency, safety, strength, environmental protection, and flexible processing. The use of laser welding technology can greatly improve the overall performance of auto parts, thereby further improving the quality of the vehicle.

 

 

A semiconductor laser brazing of automotive containers. The laser light source power used is 1-3kW; the beam quality is 100-150 mm mrad; the spot size is 1 to 2.5 mm, 1.5 x 1.5 or 2 x 6 mm2. Nickel-based welding wire (CuSi3) is selected for the filler solder. Suitable materials for this welding process include steel plates and galvanized steel plates that require high weld quality.

 

Another example is that as one of the important parts of a car, the airbag refers to a device that inflates the airbag to protect the occupant before the occupant has a secondary collision during a collision. The explosion of the airbag is controlled by a key internal component—a gas generator. During the explosion, an oxidation reaction occurs, generating a large amount of gas and generating an explosion. In view of this, the tightness requirements of the airbag liner are very high, and it is necessary to avoid overheating during the processing of the liner to make the laser welding process stand out. In this field, Feiyue Laser can provide suitable welding technology. Its core advantages include large weld penetration depth, which can reach 2-3mm, high welding strength and small welding distortion; high welding automation and welding accuracy; and laser welding The airbag is a non-contact processing without welding auxiliary tools; in addition, laser welding does not require welding rods or fillers, thereby creating a weld without impurities and pollution.


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