中国激光, 2010, 37 (12): 3187, 网络出版: 2014-03-12
激光冲击强化对齿轮接触疲劳的影响 下载: 2108次
Investigation on Contact Fatigue Strength of Gear Affected by Laser Shock Processing
摘要
用吉瓦每平方厘米量级的强激光对渗碳淬火的齿轮进行了激光冲击强化试验,对冲击处理后疲劳齿轮的综合误差进行了测量,用X射线衍射(XRD)的方法测试了残余应力和组织含量的变化,并进行了齿轮的磨损试验。结果表明,激光冲击对齿轮的精度影响较小;在齿廓的表层存在较大的残余压应力,法向残余压应力至少增加了107%,齿向的残余应力至少增加了85%;激光冲击处理使残余奥氏体的含量减小;经过磨损对比试验,未经过激光冲击强化齿面点蚀的面积是强化后齿轮的2.1倍,激光冲击能使齿轮接触疲劳寿命得到延长。
Abstract
The gear teeth were shocked by high intensity laser shock waves. The transmission error of sample after shocking were tested. The residual stress and microstructure phase transformation were measured by X-ray diffraction (XRD) technique, and the fatigue damage experiment was done to test the fatigue resistant property. The results indicated the tooth profile error after laser processing still kept lower levels and the laser shock had no effecting on transmission accuracy. That the residual compressive stress of gear enhanced greatly after laser processing, and the residual stress of gear was increased by 107% in the normal direction and 85% in the tangent direction. And that the volume fraction of austenite phase decreased after shocked process. The area of defect spot on teeth flank un-shocked was 2.1 times of that shocked, which indicates that the laser shock processing can extend the gear fatigue life.
张兴权, 何广德, 戚晓利, 童宝宏, 余晓流. 激光冲击强化对齿轮接触疲劳的影响[J]. 中国激光, 2010, 37(12): 3187. Zhang Xingquan, He Guangde, Qi Xiaoli, Tong Baohong, Yu Xiaoliu. Investigation on Contact Fatigue Strength of Gear Affected by Laser Shock Processing[J]. Chinese Journal of Lasers, 2010, 37(12): 3187.