Analysis of technological measures to control heat treatment deformation of involute gear In the process of gear machining, the compilation of heat treatment technology is a very important link. Although the comprehensive performance of the gear can be obviously improved after heat treatment, the deformation of the gear during heat treatment is inevitable, and the factors causing waste exist at any time. Therefore, it is particularly important to take reasonable measures to minimize the heat treatment deformation of gears in order to minimize the unnecessary losses caused by the heat treatment deformation of gears and reduce the production cost of enterprises. 1 Influencing factors of heat treatment deformation of involute gear The main component of involute gear is steel, and the heat treatment process of steel is a process from mother phase to new phase under the action of phase change driving force, and the source of phase change driving force ultimately comes down to temperature change. Different phase transition temperatures and different organizational changes will lead to different organizational pressures. In addition, the change of temperature will also produce corresponding thermal stress. The vector resultant force of these two stresses is the residual stress of heat treatment, and its residual amount varies with the structural position of the workpiece. When the weak part of the bevel gear can't resist the residual stress during heat treatment, the gear will be partially deformed. In addition, in the heat treatment process, the vertical speed of the surface temperature of the gear is greater than that of the inside, and the gradient of the internal and external temperatures leads to stress stratification, which undoubtedly increases the irregularity of gear deformation. In a word, the factors that cause gear deformation during heat treatment are complex and diverse. Only by carefully studying and analyzing the influence of these factors can the heat treatment deformation of involute gears be effectively improved. 1. 1 Selection of heat treatment tools and equipment Involute gears often have good plasticity after strict pretreatment. If the tooth profile design structure of involute gear is uniform and symmetrical, the uneven stress borne by the gear during heat treatment can be effectively dispersed and the irregularity of gear deformation can be reduced. The phenomena of too tight clamping, too large cutting force or too large tool friction in gear cutting will increase the residual stress on the gear surface, which will lead to the increase of gear deformation during heat treatment. In a word, unreasonable cutting has a certain influence on the heat treatment deformation of gears. For this reason, it is required to select heat treatment equipment and appropriate heat treatment tooling in the subsequent heat treatment, so as to minimize the additional amount of heat treatment deformation and lay a hardware foundation for effectively controlling the heat treatment deformation of gears.