Monday, June 17, 2019

CNC machining accuracy is not allowed? Have you learned about these methods?


CNC machining is a processing method for precision parts processing. Therefore, the requirements for CNC machining products are extremely high. Products with low precision are also required to be rebuilt or directly scrapped. For CNC machining manufacturers, it is very scary. Xiaobian told everyone about the reasons and solutions for the inaccuracy of CNC machining.

cnc machining parts


1. The workpiece size is accurate and the surface finish is poor.
The cause of the failure: the tool tip is damaged, not sharp; the machine tool generates resonance, the placement is not stable; the machine tool has crawling phenomenon; the processing technology is not good.
Solution: If the tool is not sharp after being worn or damaged, re-grind the knife or choose a better tool to re-align the tool; the machine will generate resonance or place it is not stable, adjust the level, lay the foundation, and fix it smoothly; the reason for the mechanical creep is drag The guide rail of the plate is very worn, the screw of the lead screw is worn or loose, and the machine should pay attention to maintenance. After the work, the wire should be cleaned and the lubricant should be added in time to reduce the friction. The coolant suitable for the workpiece processing can be selected to meet the processing requirements of other processes. In the case, try to use a higher spindle speed.
cnc machining parts

2. The workpiece produces a taper size
The cause of the fault: the level of the machine tool is not adjusted well, one high and one low, the placement is not stable; when turning the long axis, the contribution material is relatively hard, the tool eats the knife deeper, causing the knife phenomenon; the tailstock thimble is not concentric with the main shaft.
Solution: Use the level to adjust the level of the machine, lay a solid foundation, fix the machine to improve its toughness; choose a reasonable process and appropriate cutting feed to avoid the tool force to make the knife; adjust the tailstock.

cnc machining parts
4. The processing arc effect is not ideal, the size is not in place
The cause of the fault: the overlap of the vibration frequency causes resonance; the processing technology; the parameter setting is unreasonable, the feed speed is too large, the arc machining is out of step; the looseness caused by the screw gap is large or the screw is too tight; abrasion.
Solution: Find the part that produces resonance, change its frequency, avoid resonance; consider the processing technology of the workpiece material, and make the program reasonably; for stepper motor, the processing rate F can't be set too large; whether the machine is installed firmly, placed smoothly, drag Whether the board is too tight after wear, the gap is increased or the tool holder is loose; etc.; replace the timing belt.

cnc machining parts
5. There is a change in the processing of one part of the workpiece, and the dimensions of other processes are accurate.
Fault reason: Whether the parameters of the program block program are reasonable, whether it is within the predetermined track, and whether the programming format meets the requirements of the manual.
Solution: If there is a chaotic tooth in the thread block, if the pitch is wrong, it immediately associates with the peripheral configuration (encoder) of the cnc machining thread and the objective factor of the function.

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PTJ Hardware cnc machining factory
Sifangyuan Industrial Park, Xinshapu, Huaide Community
Humen town, Dongguan City, Guangdong Province
Phone: +86 0769 82886112
Email: sales@pintejin.com