What is the accuracy of CNC machining parts precision?

The CNC machining center is used to process parts, and the accuracy of CNC machining parts precision is the main concern of customers. The accuracy of CNC machined parts of a CNC machining center refers to the degree of accuracy of the produced product. In the machining industry, the accuracy of CNC machined parts and machining errors are both terms to evaluate the geometric parameters of the machined surface of the part. The accuracy of CNC machining parts precision is measured by tolerance grade, the smaller the grade value, the higher the accuracy. The machining error is expressed by a numerical value. The larger the numerical value, the greater the error. It can usually be understood that the precision of its CNC machining parts precision is high, and the machining error is small at the same time.

Here is the content list:

l Four major errors in the accuracy of CNC machining parts precision.

l How to maintain the accuracy of CNC machining parts precision.

l What is the accuracy of CNC machining parts precision?

Four major errors in the accuracy of CNC machining parts precision

1. Error in processing principle. The principle error of CNC machining parts precision machining is the error caused by the use of approximate machining motion or approximate tool contour. Because of the error in the machining principle, it is called the machining principle error. As long as the principle error is within the allowable range, this CNC machining precision machining method is still feasible. 

2. The geometric error of the machine tool. CNC machining parts precision accuracy The manufacturing error, installation error and wear in use of the machine tool directly affect the accuracy of the CNC machining parts precision of the workpiece. Among them are mainly the machine tool spindle rotation movement, the machine tool guide rail linear movement, and the error of the machine tool transmission chain. 

3. Manufacturing error and wear of the tool. The manufacturing error, installation error, and wear of the tool accuracy of CNC machining parts accuracy during use will affect the machining accuracy of the workpiece to a certain extent. During the cutting process of the tool, the cutting edge, face and the workpiece, and chips produce strong friction, which causes the tool to wear. When the tool wear reaches a certain level, the surface roughness value of the workpiece will increase, and the color and shape of the chips will change, accompanied by vibration. Tool wear has a direct impact on cutting productivity, machining quality, and cost.

4. Fixture error. The fixture errors of CNC machining parts' precision accuracy 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. 

Finally, the accuracy of CNC machining parts precision cannot be perfect, as long as the error is controlled within a certain range, it is of no importance.

How to maintain the accuracy of CNC machining parts precision

Before machining: Turn on the machine every day to preheat the machine and return to the machine coordinates to ensure the accuracy of the CNC machining parts precision of the machine.      

Upper part:  Pay attention to alignment during the upper part, and keep the alignment error not more than two wires (including plane and horizontal accuracy). When looking for the reference angle and centering, pay attention to the edge patrol device not exceeding 15cm of the workpiece, and avoid it when pressing the workpiece. Machined surfaces and holes. In addition, the workpiece must be clamped firmly to prevent the workpiece from flying out and hurting people due to unstable clamping. When using a crane to lift large parts, pay attention to keeping a certain distance between the workpiece and the machine tool to prevent the workpiece from colliding with the machine tool.

During processing:  Note that the surface of the workpiece must be wiped clean during tool setting to maintain the accuracy of the toolset. When drilling reaming positioning holes, pay attention to cleaning the residual iron filings in the hole with an air gun in time after drilling to ensure that there will be no tool clamping during reaming 3D machining should pay attention to whether there is a gap offset when looking for the reference angle. The tool compensation needs to be offset according to the actual situation. The cutting speed should not be too fast during finishing. The feed should be debugged according to the 3D type and program direction. In addition, when machining, pay attention to the length of the clamping tool. The shorter the tool clamping without touching the workpiece, the smaller the tool swing will be to ensure the accuracy of CNC machining parts precision.

End of processing:  Measure the accuracy of CNC machining parts precision and precision milling grooves to ensure the assembly of the mold after the workpiece is removed. 3D inspection has unfinished milled surfaces and problems in the processing are solved in time, and try to ensure one-time processing.

What is the accuracy of CNC machining parts precision?

Generally, the positioning accuracy of CNC machining parts precision is 0.01,  repetitive positioning accuracy is 0.005,  , but now most machine tool positioning accuracy is 0.006,  repetitive positioning accuracy is 0.002 or 0.003. If you add a grating ruler and a purely closed loop, the accuracy of CNC machining parts precision can be effectively guaranteed.

At last

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