Scoring Resistance of Gears with Plasma Diffusion Processing

为了解SCM415H和SACM645齿轮经离子渗碳、离子渗氮和径向渗氮后的抗划痕性能，在动力循环齿轮机上进行了齿轮试验，在Amsler试验机上进行了双辊试验。此外，利用椭圆分布热源引起的闪温上升方程对划痕阻力进行了评价。结果表明：(1)在SCM415H齿轮上，离子渗碳齿轮的划痕阻力为785N/mm，是气体渗碳齿轮的2.2倍。在SACM645齿轮上，离子渗氮齿轮的划痕阻力为721N/mm，而径向渗氮齿轮的划痕阻力为657N/mm。(2)离子渗氮、离子渗氮和径向渗氮的齿轮划痕的临界表面温度比气体渗碳的齿轮高130℃~150℃。(3)在双辊试验中，离子渗碳和气体渗碳的滚子在卡损前的摩擦系数在0.08~0.09之间。另一方面，采用离子渗氮和径向渗氮的轧辊在卡辊前的摩擦系数在0.06到0.08之间。

To clarify the scoring resistance of SCM415H gears and SACM645 gears with plasma carburizing, plasma nitriding and radical nitriding, a gear tests was carried out using a power-circulating gear machine and a two-roller tests was carried out using an Amsler machine. Further, the scoring resistance was evaluated by the equation of the flash temperature rise caused by elliptically distributed heat source. The results are summarized as follows :(1)In the case of SCM415H gears, the scoring resistance of the gears with plasma carburizing was 785 N/mm and it was 2.2 times as large as that of the gears with gas carburizing. In the case of SACM645 gears, the scoring resistance of the gears with plasma nitriding was 721 N/mm and that of the gears with radical nitriding was 657 N/mm.(2)The critical surface temperatures for scoring of the gears with plasma carburizing, plasma nitriding and radical nitriding were about 130℃-150℃ higher than that of the gears with gas carburizing.(3)In the two-roller test, the coefficients of friction just before seizure of the rollers with plasma carburizing and gas carburizing were between 0.08 and 0.09. On the other hand, the coefficients of friction just before seizure of the rollers with plasma nitriding and radical nitriding were between 0.06 and 0.08.