Knowledge of heat treatment machining accuracy

Heat treatment is a comprehensive process in which materials are heated, insulated and cooled in a certain medium, and their properties are controlled by changing their surface or internal structure. Heat treatment is one of the important processes in mechanical manufacturing, compared with other processing processes, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but by changing the microstructure of the workpiece, or change the chemical composition of the workpiece surface, give or improve the performance of the workpiece.

Metal heat treatment is one of the important processes in mechanical manufacturing, compared with other processing processes, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but by changing the microstructure of the workpiece, or change the chemical composition of the workpiece surface, give or improve the performance of the workpiece. Its characteristic is to improve the inherent quality of the workpiece, which is generally not visible to the naked eye. In order to make the metal workpiece with the required mechanical properties, physical properties and chemical properties, in addition to the rational selection of materials and various forming processes, heat treatment process is often essential. Iron and steel is widely used in the mechanical industry, the microstructure of iron and steel is complex, 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 be changed by heat treatment mechanical, physical and chemical properties, in order to obtain different performance.

The heating temperature is one of the important technological parameters in the heat treatment process. The heating temperature varies with the metal material being treated and the purpose of heat treatment, but it is generally heated above the phase change temperature to obtain high temperature tissue. In addition, the transformation takes a certain amount of time, so when the surface of the metal workpiece reaches the required heating temperature, the temperature must be maintained for a certain amount of time, so that the internal and external temperature is the same, so that the microstructure changes completely, this period of time is called the insulation time. When using high energy density heating and surface heat treatment, the heating speed is very fast, generally there is no holding time, and the holding time of chemical heat treatment is often longer.

The heating temperature is one of the important technological parameters in the heat treatment process. The heating temperature varies with the metal material being treated and the purpose of heat treatment, but it is generally heated above the phase change temperature to obtain high temperature tissue. Therefore, when the surface of the metal workpiece reaches the required heating temperature, the temperature must be maintained for a certain period of time, so that the internal and external temperature is consistent, so that the microstructure changes completely, this period of time is called the insulation time. Cooling is also an indispensable step in the process of heat treatment. The cooling method is different with different processes, mainly to control the cooling rate. Generally, the cooling speed of annealing is slow, the cooling speed of normalizing is faster, and the cooling speed of quenching is faster.

The main backbone of heat treatment co., ltd. is the elite of the heat treatment industry, with senior heat treatment engineers, and a team of front-line workers with rich practical experience. The company's production equipment is excellent, production excellence, can undertake all kinds of workpiece annealing, normalizing, tempering, cricket fire, carburizing, nitriding and other series of processing business.