How to choose the quenched and tempered gear processing material?
The contact fatigue strength and wear resistance of gears are usually improved with the increase of hardness, and the increase in hardness is closely related to the carbon content of the steel. Therefore, when designing gear products, it is necessary to calculate the strength or hardness that the product should have according to the magnitude of contact stress and bending stress, which helps to roughly determine the carbon content range of the steel. Next, the right material needs to be selected based on the strength and effective cross-section of the gear to ensure that the material is hardenable enough when hardened by heat treatment.
How to choose the right steel according to the material?
According to the requirements of the use of the gear and the size of the cross-section, suitable materials can be selected, such as 42CrMo4 and 30CrNi3Mo8 and other steels. For different materials, the higher the hardness, the toughness and plasticity of the gear may decrease. However, under high load conditions, the plasticity and toughness of the gear cannot be reduced too much, otherwise its working performance will be affected. Therefore, when selecting materials, it is necessary to select them in strict accordance with the allowable hardness of the materials to ensure the strength and durability of the gears.