采掘机械传动装置中的齿轮是量大面广的关键零件，因此要求齿轮既要承载能力大，又要安全可不和耐用。为此，国外新一代的采掘机械大都采用高合金沙碳钢、高精度精磨齿面的齿轮。但国内生产的采掘机械齿轮，材料大都采用30CrMnTi合金钢，齿面不后，热处理质量及精度与国外齿轮 Mining machinery gear in the gear is a large amount of large parts of the key, so the gear requires both bearing capacity, but also safety and durability. To this end, a new generation of foreign mining machinery mostly used high-alloy sand carbon steel, high precision grinding tooth surface gear. However, the domestic production of mining machinery gear, most of the materials used 30CrMnTi alloy steel, tooth surface is not, the quality and accuracy of heat treatment and foreign gear