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弯曲疲劳及接触疲劳是齿轮的主要失效形式,因此国内外都采用各种表面强化的手段,以提高其强度、延长其使用寿命。其中喷丸是一种简单而十分经济的形变强化手段,国外应用已较广泛。在我国,喷丸工艺大多作为一种表面清理工序,把喷丸作为强化齿轮的重要工序的生产单位很少。 关于喷丸对接触疲劳抗力的影响问题,国内外的研究都不多,而且结论不同。为此,我们将试样经常规渗碳及高浓度碳氮共渗薄层软化(简称“薄层软化”,下同)这两种工艺热处理后,分别在不喷丸、弱喷丸及强喷丸三种状态下,对其进行各种疲劳性能试验、比较寿命并分析。
Bending fatigue and contact fatigue are the main failure forms of gears. Therefore, various surface strengthening methods are adopted both at home and abroad to increase their strength and prolong their service life. One shot peening is a simple and very economical means of deformation enhancement, foreign applications have been more extensive. In China, most of the shot peening process as a surface cleaning process, shot peening as an important process to strengthen the gear unit of production is small. As for the impact of shot peening on contact fatigue resistance, there are not many studies at home and abroad, and the conclusions are different. To this end, we will sample after conventional carburizing and high concentration carbonitriding thin layer softening (referred to as “thin layer softening”, the same below) these two heat treatment process, respectively, without shot peening, weak shot peening and strong Shot peening three kinds of state, its various fatigue performance test, more life and analysis.