Talking about seven ways of positioning accuracy detection of CNC machine tools
Machining outsourcing platform today
The positioning accuracy of CNC machine tool refers to the position accuracy that can be achieved by the movement of each coordinate axis of the machine tool under the control of the numerical control device. The positioning accuracy of CNC machine tools can be understood as the motion accuracy of machine tools.
The ordinary machine tool is fed by hand, the positioning accuracy is mainly determined by the reading error, while the movement of the CNC machine tool is realized by the digital program instruction, so the positioning accuracy is determined by the CNC system and mechanical transmission error. The movement of the moving parts of the machine tool is completed under the control of the numerical control device. The accuracy of the moving parts under the control of the program command directly reflects the accuracy of the machining parts. Therefore, the positioning accuracy is a very important detection content.
7. Accuracy detection of the original point return of rotary table
The measurement method is to reset the original point once from 7 arbitrary positions, and determine the stop position. The maximum difference value read out is used as the origin reset accuracy.It should be pointed out that the existing positioning accuracy detection is measured under the condition of fast positioning. For some CNC machine tools with poor wind degree of feed system, different positioning accuracy values will be obtained when using different feed speed positioning. In addition, the measurement results of positioning accuracy are related to the ambient temperature and the working state of the coordinate axis. At present, most CNC machine tools adopt semi closed-loop system, and most of the position detection elements are installed on the drive motor. It is not surprising that an error of 0.01 ~ 0.02 mm is generated within 1 m stroke. This is the error caused by thermal elongation. Some machine tools use pre stretching (pre tightening) method to reduce the impact.
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