The structure and shape of machine parts are composed of some basic geometric surfaces. The machining process of machine parts is the process of obtaining these geometric surfaces. Different processing methods can be selected for the same surface, but the processing quality, processing time and cost obtained by each processing method are different. The task of engineering and technical personnel is to select the most appropriate processing method according to the specific processing conditions, so as to ensure that the machine parts meeting the requirements of the drawings can be processed. When selecting the processing method, the final processing method is always selected first according to the technical requirements of the main surface of the part and the specific conditions of the factory, and then the processing methods of the relevant previous processes of the surface are selected one by one. The machining surface of parts has certain processing requirements. Generally, it is impossible to achieve the requirements through one processing, but it can be achieved gradually through multiple processing (i.e. multiple processes).
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Arrangement of heat treatment process and surface treatment process!
The heat treatment processes arranged to improve the cutting performance of workpiece materials, such as annealing, normalizing, quenching and tempering, should be carried out before cutting.
In order to eliminate the internal stress of the workpiece, the heat treatment process, such as artificial aging and annealing, should be arranged after the rough machining stage.
In order to improve the mechanical properties of workpiece materials, heat treatment processes, such as quenching, carburizing and quenching, are generally arranged between semi finishing and finishing.
In order to improve the wear resistance and corrosion resistance of the workpiece surface, the heat treatment process arranged for the purpose of decoration, such as chromium plating, zinc plating, blue plating, etc., are generally arranged in the final stage of the process.
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