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Piston rod surface quenching process
Jan 30, 2019

Considering the working nature and characteristics of the piston rod, in order to prolong its service life as much as possible, it is not only required to have good comprehensive mechanical properties to prevent deformation and fracture requirements, but also to ensure good wear resistance on the surface. Therefore, high-frequency quenching treatment is often used in the production process, and the semi-automatic continuous quenching furnace is used for the quenching equipment.


For the surface quenching process of the piston rod product, it is conveyed to the quenching furnace conveyor belt by the feeding machine, and is heated and quenched by feeding the belt horizontally and uniformly into the induction coil. The key to surface quenching is the choice of induction coil fabrication and quenching process parameters. The induction coil is made of 10*8mm rectangular copper tube, and is designed as a double-layer structure placed side by side. The front and rear rings are separated by a certain distance. The front ring does not make a water spray hole, and the front ring is used for preheating.


The advantage of this design is that the piston rod can be uniformly heated to properly control the temperature of the product after water cooling, and use the residual heat to temper itself. In summary, the purpose of surface hardening is to obtain a high surface hardness to support the surface chrome plating layer, thereby improving the wear resistance and corrosion resistance of the piston rod.