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在齿轮实物及辊子试样上研究了接触疲劳过程,齿轮实物经过台架试验,而辊子试样则在自制二辊式试验机上运转到产生接触疲劳破坏。齿轮及试样均用30CrMnTi 钢制造并经渗碳或碳氮共渗。有两种接触疲劳破坏形式:麻点及压陷,对其形成机理进行了探讨。产生麻点时,裂缝形成于表面;而产生压陷时,裂缝形成于硬化层与心部的交界区。采用高浓度气体碳氮共渗工艺,得到C、N 含量较高(与一般渗碳或碳氮共渗工艺相比)并含有粒状C、N 化合物的硬化层,可使齿轮麻点剥落抗力显著增高。
The contact fatigue process was studied on the gear in-kind and on the roller sample. The gear was actually tested on the bench, while the roller sample was run on a self-made two-roll tester to produce contact fatigue failure. Gears and specimens are made of 30CrMnTi steel and carburized or carbonitriding. There are two types of contact fatigue damage: pitting and depression, its formation mechanism was discussed. Occur in pitting, the cracks formed on the surface; and produce a depression, cracks formed in the hardened layer and the heart of the junction area. The use of high concentration gas carbonitriding process, to get C, N content (compared with the general carburizing or carbonitriding process) and contains granular C, N compounds hardened layer, the gear pitting spalling resistance significantly Increase.