1. Preliminary heat treatment The purpose of the preliminary heat treatment is to eliminate the internal stress generated during the manufacturing process of the blank, improve the machinability of the metal material, and prepare for the final heat treatment. Preliminary heat treatment includes quenching and tempering, annealing, normalizing, etc., which are generally arranged in Before roughing, after. Arranging before roughing can improve the machinability of the material; after roughing, it is beneficial to eliminate residual internal stress.
2. The final heat treatment should generally be arranged after roughing, semi-finishing, and before and after finishing. Heat treatment with large deformation, such as carburizing and quenching, quenching and tempering, etc., should be arranged before finishing so as to be corrected during finishing. Deformation by heat treatment; heat treatment with less deformation, such as nitriding, can be arranged after finishing.
3. Aging treatment The purpose of aging treatment is to eliminate internal stress and reduce workpiece deformation. Aging treatment is divided into three categories: natural aging, artificial aging and ice-cold treatment. Aging treatment is generally arranged after rough machining and before finishing; for higher precision requirements The parts can be arranged for an aging treatment after semi-finishing; ice-cold treatment is generally arranged after tempering or finishing or at the end of the process.
4. Surface treatment For surface anticorrosion or surface decoration, it is sometimes necessary to coat or bluish the surface. This surface treatment is usually arranged at the end of the process. The production process refers to all the products made from raw materials (or semi-finished products). process. For machine production, it includes transportation and storage of raw materials, preparation for production, manufacturing of blanks, processing and heat treatment of parts, assembly and debugging of products, painting and packaging, etc. The content of the production process is very extensive. Modern enterprises use the principles and methods of systems engineering to organize and guide production, and regard the production process as a production system with input and output. It can make the management of the enterprise scientific and make the enterprise more adaptable and competitive.