The position of the heat treatment process in the precision machining process

2021-03-23 14:17:50 admin

The position of the heat treatment process in the precision machining process

In the precision machining process, how to arrange the position of the heat treatment process? Insert heat treatment in the machining process at the right time, so that the cold and hot processes can be better matched, and the deformation caused by heat treatment can be avoided. The arrangement of heat treatment, According to the purpose of heat treatment, it can generally be divided into:


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 cutting performance of metal materials, and prepare for the final heat treatment. The preliminary heat treatment includes quenching and tempering, annealing, normalizing, etc., generally arranged in Before and after roughing. Arrangement before roughing can improve the cutting performance of the material; after roughing, it is helpful to eliminate residual internal stress.

2. The final heat treatment should generally be arranged after rough machining, 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 that it can be corrected during finishing. Deformation of 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; higher precision is required The parts can be arranged for an aging treatment after semi-finishing; the ice-cold treatment is generally arranged after the tempering treatment or after the finishing or the end of the process.

4. Surface treatment For surface anti-corrosion or surface decoration, sometimes it is necessary to coat or bluish the surface. This surface treatment is usually arranged at the end of the process.

The production process refers to the entire process of making products from raw materials (or semi-finished products). For machine production, it includes the transportation and storage of raw materials, production preparation, blank manufacturing, parts processing and heat treatment, product assembly, and debugging, painting and packaging. The content of the production process is very extensive. Modern enterprises use the principles and methods of system engineering to organize and guide production, and regard the production process as a production system with inputs and outputs. It can make the management of the enterprise scientific, and make the enterprise more adaptable and competitive.

In the production process, the process of directly changing the shape, size and performance of the raw material (or blank) to turn it into a finished product is called the process. It is the main part of the production process. For example, casting, forging and welding of blanks; heat treatment to change the properties of materials; machining of parts, etc., are all technological processes. The technological process is composed of one or several sequential procedures.

The process is the basic unit of the technological process. The so-called process refers to the part of the process that is continuously completed for one or a group of workpieces at a work site. The main feature of forming a process is that the processing objects, equipment and operators are not changed, and the content of the process is completed continuously