We divide the machining into four stages as follows.
First, the surface first and then the hole
For the box, bracket and connecting rod and other parts should be machined plane first and then hole. This will allow the processing of holes with plane positioning, to ensure the accuracy of the position of the plane and hole, and to bring convenience to the processing of holes on the plane.
Second, first processing datum surface
Parts in the processing process, as a positioning reference surface should be processed first, in order to provide a fine reference for the subsequent processes as soon as possible. Called "benchmark first".
Third, the finishing process
The main surface finishing process (such as grinding, honing, fine grinding rolling processing, etc.), should be placed in the last stage of the process route, the surface finish after processing in Ra0.9um or more, a slight collision will damage the surface, in Japan, Germany and other countries, after the finishing process, are protected with a flannel, absolutely no hands or other objects directly touch the workpiece, so as to avoid the finishing process surface, due to The transit and installation between the work process and be damaged.
Fourth, the division of processing stages
Processing quality requirements of the surface, are divided into processing stages, generally can be divided into rough machining, semi-finishing and finishing three stages. Mainly to ensure the quality of processing; conducive to the rational use of equipment; facilitate the arrangement of heat treatment processes; and facilitate the discovery of defects in the blank.
