Machine tool gears in Europe and the United States have long used carburizing and quenching and grinding processes. Recently, some machine tool gears have been treated with aluminum-free chrome steel nitriding or soft nitriding, which significantly improved the wear resistance against contact fatigue wear. The nitriding gears have no fatigue strength and impact fatigue strength compared to nickel chrome. Steel carburizing and quenching is low.
Gear heat treatment characteristics and structural design principles Heat treatment characteristics General machine tool gears are made of medium carbon steel and subjected to high frequency induction heat treatment. The obtained hardness, wear resistance, strength and toughness can meet the requirements, and high frequency quenching has small deformation and high productivity. advantage. Process route of high-frequency hardened gear: structural design principle (1) When quenching double gears, the distance between the two gears is not less than 8mm. (2) When the grooved fork part of the tower gear requires quenching, the thickness of the end section is not less than 5mm. The groove width is not less than 12mm. (3) When the gear end face is quenched, the quenched part should be not less than 1mm and should be inverted to 45 degrees. (4) When both the tooth and the end require quenching, the distance between the end face and the tooth should be no less than 5mm.
In addition to the general gear characteristics, the machine tool gear has its own characteristics. In the design, according to its application characteristics, select the appropriate materials and heat treatment process; at the same time should pay attention to the rationality of its structural design.
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