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Title:Machining process requirements of parts
      The mechanical manufacturing process generally refers to the sum of the machining process of parts and the assembly process of the machine. To formulate the machining process, it is necessary to determine how many processes the workpiece will go through and the sequence of the working procedures. Only the brief technological process that lists the main process name and its processing sequence is called the process route.

The main task is to select the processing method of each surface, determine the processing sequence of each surface, and the number of processes in the whole process. Certain principles must be followed in the process route planning.

Principles for drawing up machining parts process route:

1. First machining datum plane: during the machining process of parts, the surface as positioning datum shall be machined first, so as to provide precise datum for subsequent processing as soon as possible. It is called "benchmark first".

2. Division of processing stage: the surface with high quality requirements is divided into three stages: rough machining, semi finishing and finishing. It is mainly to ensure the processing quality, to use the equipment reasonably, to arrange the heat treatment process, and to find the blank defects easily.

3. Face before hole: for parts such as box, bracket and connecting rod, the plane shall be machined first and then the hole shall be processed. In this way, the hole can be processed by plane positioning, which ensures the position accuracy of plane and hole, and brings convenience to the processing of hole on the plane.

4. Finishing: the finishing of the main surface (such as grinding, honing, finishing grinding / rolling, etc.) should be carried out at the later stage of the process route. The surface finish after processing is above ra0.8um, and slight collision will damage the surface;

In Japan, Germany and other countries, after finishing, flannelette should be used for protection. Hands or other objects are not allowed to directly contact the workpiece, so as to avoid damage to the finished surface due to the transfer and installation between processes.
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