Causes:

Tool wear will cause cutting force changes, which in turn affects the accuracy of workpiece size. It may also be that the machine tool may be affected by thermal expansion or thermal deformation during operation, resulting in workpiece size deviation. 

Another is inaccurate processing parameter settings, such as inaccurate settings of feed speed, cutting depth, etc., which will affect the accuracy of workpiece size.

Solution:
For part size problems caused by tool wear, it is necessary to regularly check and replace worn tools to ensure that the tools maintain a good cutting state. 

If it is a deformation problem caused by the loss of control of the machine tool thermal management. It is necessary to control the temperature of the machine tool and take cooling measures, such as using coolant or adding a cooling system to reduce the impact of thermal deformation. 

If the problem of part size is caused by the problem of processing parameter setting, the processing parameters can be reasonably set according to the material properties, tool type and processing requirements. Conduct a trial cutting test and find the best processing conditions by adjusting the parameters. 

However, this reason is considered by Longterm Mould to be the lowest level of error. The fundamental reason is the training of the company’s technical personnel and the error in quality management awareness.