Under the effect of alternating loads such as torsion and bending and impact loads, the surface layer of the workpiece bears higher stress than the core. In the case of friction, surface layer is also constantly worn, so some parts surface layer to put forward high strength, high hardness, high wear resistance and high fatigue limit requirements, only the surface strengthening to meet the above requirements. The use of heat treatment can improve the strength, hardness, toughness, elasticity of the parts, at the same time, can also improve the cutting performance of the embryo or raw materials, so that it is easy to process. It can be seen that heat treatment is an indispensable process method to improve the technological performance of raw materials or embryos, guarantee product quality, extend service life and tap material potential. Heat treatment is widely used in machinery manufacturing.
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. Annealing, normalizing, quenching and tempering are the "four fires" in the overall heat treatment.
Annealing is a heat treatment process in which metals and alloys are heated to the right temperature for a certain period of time and then cooled slowly. Purpose of annealing:
(1) reduce the hardness of steel, improve the plasticity, in favor of cutting and cold deformation processing.
(2) refine the grain, eliminate the structure defects caused by casting, forging, welding, uniform steel structure and composition, improve the performance of steel or for the later heat treatment of the organization.
(3) to eliminate the internal stress in steel to prevent deformation and cracking.
Heat treatment is one of the important processes in the manufacture of mechanical parts and molds. Its characteristic is to improve the inherent quality of the workpiece. Our home and the heat treatment company production equipment is sophisticated, detection means are complete, production excellence, can undertake all kinds of workpiece annealing, normalizing, tempering, cricket fire, carburizing, nitriding, carbonitriding. Multiple co-osmosis. The surface of the gear axle Cui fire. Solid solution of copper and aluminum alloy. Aging processing business.
On 2018-08-08 11:45:46
