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1. Gear quenching is to greatly improve the rigidity, hardness, wear resistance, fatigue strength and toughness of steel, so as to meet the different requirements of various mechanical parts and tools.
2. The quenching of steel is to heat the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hyper-eutectoid steel), hold it for a period of time, make it all or part austenitized, and then exceed the critical cooling rate. The cold speed is rapidly cooled to a heat treatment process of martensite (or bainite) transformation below Ms (or isothermal near Ms). The solution treatment of materials such as aluminum alloys, copper alloys, titanium alloys, tempered glass, or the heat treatment process with a rapid cooling process is also referred to as quenching.
3. There are teeth on the rim that can continuously mesh the mechanical components that transmit motion and power. The use of gears in transmissions has long appeared. At the end of the 19th century, the principle of the incision method and the special machine tools and tools that used this principle to cut the teeth appeared one after another. With the development of production, the smoothness of the gear operation was taken seriously.
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