Notes

Seven major errors in CNC precision parts processing

There are also deficiencies in the current CNC machining https://www.machining-custom.com/cnc-machining/ in the modern era. There are mainly the following seven major errors in the machining of CNC precision parts:


1. The geometric error of the machine tool

The manufacturing error, installation error and wear of the machine tool directly affect the machining accuracy of CNC parts. Among them are mainly the errors of the rotary motion of the machine tool spindle, the linear motion of the machine tool guide rail and the machine tool transmission chain.


2. The principle error of CNC machining

The principle error of CNC machining is the error caused by the approximate CNC machining motion or the approximate tool contour. Because there is an error in the CNC machining principle, it is called the CNC machining principle error. As long as the principle error is within the allowable range, this CNC machining method is still feasible.


3. Tool manufacturing error and wear

The manufacturing error, installation error and wear of CNC machining tools all affect the machining accuracy of CNC parts https://www.machining-custom.com/product/. During the cutting process of the tool, the cutting edge, the cutter face and the workpiece and chips generate strong friction, which causes the tool to wear. When the tool wear reaches a certain value, the surface roughness value of the workpiece increases, and the color and shape of the chip change, accompanied by vibration. Tool wear will directly affect cutting productivity, CNC machining quality and cost.


4. Fixture error

Fixture errors in CNC machining include positioning errors, clamping errors, fixture installation errors, and tool setting errors. These errors are mainly related to the manufacturing and assembly accuracy of the fixture. CNC machining accuracy cannot be perfect, as long as the error is controlled within a certain range, it is insignificant. Tool manufacturing errors and wear.


5. Positioning error

Positioning errors mainly include reference misalignment errors and positioning manufacturing inaccurate errors. When performing CNC machining on a workpiece on a machine tool, it is necessary to select several geometric elements on the workpiece as the positioning datum during CNC machining. Datum) does not coincide, and there will be a datum misalignment error. The positioning surface of the workpiece and the positioning element of the fixture together constitute a positioning pair. The large position change of the workpiece caused by the inaccurate manufacturing of the positioning pair and the matching gap between the positioning pairs is called Create inaccurate errors for positioning vices. The inaccurate error of positioning manufacturing will only occur when the adjustment method is used for CNC processing, and will not occur in the trial cutting method.


6. Adjustment error

In each process of CNC machining, it is always necessary to adjust the process system in one way or another. Since the adjustment is impossibly accurate, adjustment errors arise. In the process system, the mutual position accuracy of the workpiece and the tool on the machine tool is guaranteed by adjusting the machine tool, tool, fixture or workpiece. When the original accuracy of the machine tool, tool, fixture and workpiece blank meets the process requirements without considering the dynamic factors, the adjustment error plays a decisive role in the CNC machining error.


7. Measurement error

When the parts are measured during or after CNC machining, the measurement accuracy is directly affected by the measurement method, the accuracy of the measuring tool, the workpiece and the subjective and objective factors.



The above seven CNC machining errors can be avoided to a certain extent, so operators who need to perform CNC machining can more carefully detect and verify all directions of these seven machining processes that are likely to cause CNC machining errors during processing. Then carry out CNC machining operations, so that the influence caused by CNC machining errors can be better reduced.

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