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Factors affecting the dimensional accuracy of CNC machining
Dec 10, 2018

First, factors that can avoid the dimensional accuracy of CNC machining


Processing technology


In most of the actual machining errors are caused by unreasonable machining processes, in the basic processing technology (such as milling CNC machining, "first coarse and fine, first face back hole, first large face small face" or fixture use" Reduce the number of clamping times, try to use the combination of fixtures and other basic processing technology details, to minimize the processing error caused by iron filings on aluminum parts, because the aluminum parts are very soft, the excluded iron filings can easily cause machining errors in aluminum parts. . For example, in the FANUC or Central China Machining Center, the deep hole should be used as much as possible with the G83 command, so that the iron filings can be discharged instead of the G73 command.


2. Numerical calculation in manual programming and automatic programming


3. Cutting three elements: cutting speed VC, feed amount floor cutting depth AP and tool compensation


In this case, in simple terms, under the premise of ensuring the processing quality and tool wear, the adjustment parameters fully exert the cutting performance of the tool, so that the cutting efficiency is the highest and the processing cost is the lowest.


In the CNC lathe, there are also factors such as the wear compensation of the cutter head. Since I have not touched the lathe for a long time, I dare not go down to the details.


4. For the knife, the inaccurate tool is also the factor that causes the size error. Therefore, try to choose a good edge finder. If the machine has an automatic tool setter, it is better.


Second, irresistible factors:


1. Cooling deformation after workpiece processing


This is basically unavoidable. Pay attention to the use of coolant during processing and pay attention to the deformation of the workpiece after cooling.


2. The stability of the machine itself


If it is not a new machine tool or the machine tool has undergone a lot of machining without debugging, the dimensional error caused by the machine itself may occur.


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