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The manufacturing materials and heat treatment process of the gear have a great impact on the bearing capacity and dimensional weight of the gear. Before the 1950s, Wuyi automobile gear used carbon steel, used alloy steel in the 1960s, and used surface hardened steel in the 1970s. According to the hardness, the tooth surface of the gear can be divided into two kinds: soft tooth surface and hard tooth surface.
The bearing capacity of the hard tooth surface gear of the gear is high, and it is quenched, surface quenched or carburized quenched after the gear is finely cut to improve the hardness. However, in the heat treatment, the gear will inevitably be deformed, so after the heat treatment, the gear must be ground, ground or fine cut to eliminate the error caused by deformation and improve the precision of the gear.