CNC machining process

For example, certain positioning reference surfaces need to be machined easily and accurately in the semi-finishing stage or even in the roughing stage. Sometimes in order to avoid the conversion of the dimensional chain, in the finishing stage, semi-finishing of certain secondary surfaces can also be arranged.

After determining the processing method and processing stage of the part surface, the processing of each surface in the same processing stage can be combined into several steps.

1. Method of dividing processing procedures

Parts processed on CNC machine tools are generally divided into processes according to the principle of process concentration. The methods of division are as follows:

1) Divided by the tools used

Taking the process completed by the same tool as a working procedure, this division method is suitable for situations where there are many workpiece surfaces to be machined. Machining centers often use this method to complete.

2) Divided by the number of workpiece installations

Take the technological process that can be completed by the part once clamping as a process. This method is suitable for parts with few processing contents. Under the premise of ensuring the quality of parts processing, all processing contents can be completed in one clamping.

3) Divided by roughing and finishing

The part of the process completed in rough machining is regarded as one process, and the part of process completed in finishing is regarded as another process. This division method is suitable for parts that have strength and hardness requirements, require heat treatment or require high accuracy of parts, need to effectively remove internal stress, and have large deformation after machining, which needs to be divided into rough and finishing stages.

4) According to the processing position, the part of the process that completes the same profile is regarded as a process.

For parts with many machining surfaces and more complex, the sequence of CNC machining, heat treatment and auxiliary procedures should be arranged reasonably, and the connection problem between the procedures should be solved. 2. The principle of division of processing procedures Parts are composed of multiple surfaces, these surfaces have their own accuracy requirements, and there are corresponding accuracy requirements between each surface.