Heat treatment process of mechanical parts manufacturing

Heat treatment is a kind of metal hot working technology which can heat, heat and cool the metal material in a certain medium, and control its performance by changing the metallographic structure on the surface or inside of the material. Sometimes there are only two processes: heating and cooling. These processes are interlinked and uninterrupted.

Metal heat treatment is one of the important processes in mechanical manufacturing. Compared with other processing technologies, heat treatment generally does not change the shape and overall chemical composition of the workpiece, but endows or improves the performance of the workpiece by changing the microstructure inside the workpiece or the chemical composition on the surface of the workpiece. Its characteristic is to improve the internal quality of the workpiece, which is generally not visible to the naked eye.

In order to make the metal parts have the required mechanical, physical and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment process is often essential. Steel is the most widely used material in mechanical industry. The microstructure of steel is complex and can be controlled by heat treatment, so the heat treatment of steel is the main content of metal heat treatment. In addition, aluminum, copper, magnesium, titanium and their alloys can also change their mechanical, physical and chemical properties through heat treatment to obtain different service properties.

Heat treatment process can be divided into three categories: overall heat treatment, surface heat treatment and chemical heat treatment. According to the different heating medium, heating temperature and cooling method, each kind can be divided into several different heat treatment processes. Different heat treatment processes can be used for the same metal to obtain different structures and different properties. Steel is the most widely used metal in industry, and the microstructure of steel is also the most complex, so there are many kinds of heat treatment process. Heat treatment is one of the important processes in the manufacturing process of mechanical parts and tools. Generally speaking, it can guarantee and improve various properties of workpiece, such as wear resistance, corrosion resistance, etc. It can also improve the structure and stress state of the blank, so as to facilitate all kinds of cold and hot processing.