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随着煤炭工业的高速发展，煤矿挖掘设备也向着低速重载化的方向发展，同时对其传动零部件，诸如齿轮轴的要求也越来越高。为了保证重载齿轮轴经常处在较高的载荷下工作而不发生早期失效，必须对齿面进行硬化处理，使齿面具有良好的耐磨性、高的接触疲劳强度、高的抗弯曲强度
With the rapid development of the coal industry, coal mining equipment has also been developed towards low-speed heavy-hauling. At the same time, the requirements for its transmission components such as gear shafts have also become higher and higher. In order to ensure that heavy-duty gear shafts often work under high loads without early failure, the tooth surfaces must be hardened to provide good wear resistance, high contact fatigue strength, and high flexural strength