For the processing of high-precision and high hardness gears, including the heat treatment of materials, the processing of tooth profiles and the surfacing of copper layers, two times of tooth profile heat treatment and two times of wire cutting tooth profiles are used. One time of heat treatment is to eliminate the internal stress of the rack material, and then the first time of wire cutting tooth profiles is carried out. The second time of heat treatment is to make the tooth profiles meet the hardness requirements. Both ends of the gear are coated with copper layers. After grinding the outer circle, the second time of wire cutting tooth profiles is carried out, So as to achieve the coaxiality between the rack and the outer circle.

The rack prepared by this alternative method not only overcomes the hardenability problem of heat treatment materials, but also meets the hardness requirements, and improves the coaxiality of tooth profile and outer circle while ensuring the accuracy of tooth profile.

Gear machining is mainly divided into spur gear rack and helical gear rack, which are paired with spur gear and helical gear respectively; The tooth profile of gear processing is a straight line rather than an involute, which is equivalent to a cylindrical gear with an infinite dividing circle radius. The main feature is that the rack profile is straight, so the pressure angle of each point is the same, and the inclination angle of the rack profile is also the same. Any straight line parallel to the top line of the rack has the same pitch and modulus. The basis for calculating the rack size is the straight line parallel to the top line of the rack and with the tooth thickness equal to the width of the slot, which is called the dividing line (centerline).

The above is the analysis and introduction of heat treatment methods for gear processing. If you need gear processing, please consult HF Hefa gear manufacturer.