• Categories:Company News
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• Time of issue:2022-03-31 08:42
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(Summary description)Crossed roller bearings have excellent rotation accuracy and greatly save installation space. They are widely used in modern precision machinery and equipment. The reason why bearings have good performance is inseparable from the heat treatment process when processing their materials. Finished product usage plays a vital role. The heat treatment of bearing rings is also a key factor affecting production efficiency and finished product quality. Today, the editor will talk to you about the influence of heat treatment on bearing materials. 1. Quenching cracks There are two types of quenching cracks after bearing quenching: deep cracks and surface cracks. Deep cracks are caused by stresses related to temperature gradients; surface cracks are related to surface decarburization. Another reason for cracks is mainly due to the reduction of the brittle fracture strength of the formed martensite due to the higher quenching temperature. Increasing the quenching temperature will reduce the number of quenching cracks; ℃, can make it more stable. If it is taken out from the hot oil and cleaned immediately, it will induce cracks, and even a mixture of a small amount of water entering the quenching oil will significantly increase the risk of cracks; if the intermediate annealing is not sufficient, or the decarburized layer is not removed. Secondary quenching also increases the possibility of cracks. Surface quenching cracks caused by decarburization are largely related to the depth of the tool marks on the surface after machining, which causes stress concentration. The greater the depth of the tool marks before quenching, the longer the cracks after quenching.