What are the factors that affect the accuracy of parts machining-

1.CNC lathe deviation   

CNC lathe error refers to the production deviation, installation error and damage of the machine tool. It mainly contains the guiding error of the machine guideway, the rotation deviation of the lathe spindle and the transmission error of the transmission gear of the CNC lathe. 

2. Processing basic principle deviation 

Machining basic principle error refers to the deviation caused by the similar leaf profile should be similar transmission system associated to carry out the processing. Most of the deviation from the basic principle of machining occurs in the machining of screw threads, transmission gears and complicated oblique surfaces. 

3. Adjustment deviation 

The adjustment error of CNC lathe refers to the deviation caused by the wrong adjustment.

4. Residual stress in the product workpiece

The formation of residual stress: the residual stress of the blanking and heat treatment process; the residual stress generated by the cold straightening; the residual stress caused by processing.

5. Processing site environmental hazards

Processing field often have many tiny metal material chips, if the presence of positioning surface or positioning holes, will affect the processing of digital parts CNC machining precision. For high CNC machining precision processing, some of the human eye can not see the fine metal material chips will affect the CNC machining precision. This factor can be identified out, but there is no effective way to eradicate, usually lies in the staff's way and method. 

6. Production deviation and damage of jigs and fixtures

The deviation of jigs and fixtures mainly refers to the manufacturing deviation of precise positioning components, CNC blade guiding components, measuring range organization, and jigs and fixtures themselves. Work fixture installation, the above components of the actual operation of the relative size deviation between the surface; the use of work fixtures in the work of the surface layer of the damage.

7, CNC insert manufacturing deviation and damage

Milling cutter deviation on machining measurement accuracy hazards due to the type of CNC inserts and different.

8.Process program force deformation. 

In the cutting speed, clamping force, force and moment of inertia under the influence of the process program will appear deformation, thereby destroying the regulated process program of the various parts of the precise positioning of each other, resulting in the formation of machining deviation, jeopardizing the stability of the whole process of machining. First of all, it is necessary to understand the CNC lathe, the deformation of the workpiece and the total deformation of the process program. 

9. Comprehensive thermal expansion of the whole process

In the machining process, the process program suffered internal structural thermogenics (cutting heat, friction heat) or external thermogenics (operating temperature, radiant heat) of the heating deformation, thereby affecting the processing CNC machining precision. In all kinds of products workpiece processing and CNC machining precision machining, the processing deviation caused by thermal expansion of the process program accounts for about 40% -70% of the processing deviation.