Preventing Deformation after High-Frequency Quenching: After rough machining, the gear blank is formed into a precision forging and undergoes normalizing or tempering treatment to achieve the following objectives: softening the steel for easier machining; eliminating residual stresses; refining the grain structure and improving the microstructure to enhance the mechanical properties of the steel; and preparing the material for final heat treatment. It is important to note that during normalizing or tempering, the furnace temperature must be kept uniform, and workholding fixtures should be used to ensure even heating and cooling of the parts. Parts should never be stacked together. Pump tube quenching equipment from Zhengzhou Guoyun, with twenty years of experience in high-frequency shaft quenching equipment.
Quenching technology is widely applied in modern machinery manufacturing. Important mechanical components, especially those used in automobiles, airplanes, and rockets, are almost always subjected to quenching treatment. To meet the diverse technical requirements of various components, various quenching processes have been developed. For example, based on the treated area, there are whole-piece quenching, partial quenching, and surface quenching; according to whether the phase transformation is complete during heating, there are complete quenching and incomplete quenching (for hypo-eutectoid steels, this method is also called subcritical quenching); according to the content of phase transformation during cooling, there are分级quenching, isothermal quenching, and under-speed quenching, etc. For gears that need holes drilled to reduce weight, the drilling process should be scheduled after heat treatment. The final heat treatment of gears uses high-frequency quenching of the tooth surface, which causes less deformation. After high-frequency quenching, the tooth surface has high strength, hardness, wear resistance, and fatigue limit, while the core still maintains sufficient ductility and toughness. To minimize deformation, high-frequency quenching should use lower quenching temperatures, shorter heating times, uniform heating, and slow cooling.