SprocketQuenching is that some parts (including sprockets) are subjected to alternating loads such as torsion and bending and impact loads during operation, and their surface layers are subjected to higher stress than the core.
The necessity of sprocket quenching
In the case of friction, the surface layer is constantly worn, so the surface layer of some parts requires high strength, high hardness, high wear resistance and high fatigue limit. Only surface strengthening can meet the above requirements.Because surface quenching has the advantages of small deformation and high productivity, it is widely used in production.
Sprocket quenching purpose
The purpose of sprocket quenching is to transform supercooled austenite into martensite or bainite to obtain martensite or bainite structure, and then tempering at different temperatures to greatly improve the strength, hardness, and strength of steel. Wear resistance, fatigue strength and toughness, etc., to meet the different requirements of various mechanical parts and tools.
Put the workpiece in the inductor made of hollow copper tube, and after passing the intermediate frequency or high frequency alternating current, an induced current of the same frequency is formed on the surface of the workpiece, and the surface of the part is rapidly heated (the temperature can be increased by 800~ 1000 degrees, the core is still close to room temperature), and then spray cooling (or oil immersion quenching) immediately to harden the surface layer of the workpiece.