钛合金薄壁叶片喷丸变形的研究

目的 研究喷丸工艺对钛合金薄壁叶片变形的影响,找到解决喷丸变形的方法 .方法 对钛合金薄壁叶片进行喷丸强化,采用三坐标测定喷丸前后叶片的尺寸变化情况.结果 在喷丸强度和覆盖率一致的前提下,采用不同的路径对叶片进行喷丸后,叶片的变形趋势和变形量没有很大差异.叶片进行喷丸后,采用相同的喷丸强度对叶片进行二次喷丸,叶片几乎不发生变形,需要采用更高的喷丸强度进行二次喷丸才可以使叶片发生变形.在喷丸之前对叶片进行真空去应力,虽然叶片表面的残余应力有相应减少,但与不进行真空去应力的叶片相比,喷丸变形情况没有发生太大的改变.结论 可采用喷丸前预变形和喷丸校正的方法 解决喷丸变形的问题,使得叶片喷丸后的尺寸达到图纸的要求.

Deformation Influence of Shot Peening on Thin-wall Titanium Alloy Blade

Objective To research the deformation influence of shot peening on thin-wall titanium alloy blade and find methods to resolve the deformation problems about shot peening. Methods Thin-wall titanium alloy blade was shot peened and the size and dimension of blade were measured. Results The deformation value and tendency were basically the same with various shot peen paths if the intensity and coverage were the same. Blade showed nearly no deformation if the intensity of the second shot peening was the same as the first shot peening. The intensity of the second shot peening must be higher than that of the first shot peening in order to cause deformation of the blade. The surface residual stress of the blade decreased after vacuum distressing, but the deformation value and tendency were basically the same as those of the blade that did not undergo vacuum distressing. Conclusion Based on the situation of blade deformation after shot peening, pre-deformation and shot peening straightening methods were recommended to make the size and dimension of blade meet the requirement of drawing.