多撞针超声波喷丸校形的工艺参数研究

Research on process parameters of multi-pin ultrasonic shot peening sizing

为了提高超声波喷丸校形工艺的工作效率及可控性,以自研的65针超声波喷丸校形设备为研究对象,对其喷丸工艺参数展开了研究。通过正交试验法,分析了气体压力、撞针行程和超声波振幅对喷丸强度的影响规律。结果表明:Almen试片在气体压力为0.65 MPa、超声波振幅为25.6μm、撞针行程为1 mm的条件下,得到的校形弧高的最大值为1.073 mm,即采用该组合获得的喷丸强度最大;另外,喷丸强度与超声波振幅及气体压力呈正相关,与撞针行程呈负相关;对薄壁件弯曲变形影响最大的工艺参数为超声波振幅,其次为撞针行程,影响最小的为气体压力。最后,通过搭建的检测系统研究了喷丸工艺参数对撞针冲击速度的影响规律,结果与正交试验的结果一致。

To improve the working efficiency and controllability of ultrasonic shot peening sizing process,the shot peening process parameters of the self-researched 65-pin ultrasonic shot peening sizing device were studied,and the influence laws of air pressure,firing pin stroke and ultrasonic amplitude on shot peening strength were analyzed by orthogonal test method.Results show that for Almen test piece,the maximum height of sizing arc obtained is 1.073 mm under the air pressure of 0.65 MPa,the ultrasonic amplitude of 25.6μm and the firing pin stroke of 1 mm,and the maximum shot peening strength is obtained under this composition.In addition,the shot peening strength is positively correlated with the ultrasonic amplitude and the air pressure,and negatively correlated with the firing pin stroke.Furthermore,the process parameter that has the greatest impact on the bending deformation of thin-walled parts is ultrasonic amplitude,followed by the firing pin stroke,and the air pressure has the least impact.Finally,the influence laws of shot peening process parameters on impact velocity of firing pin are studied by the established detection system,and the results are consistent with that of orthogonal test.