15-5PH材料结构件喷丸质量研究

Shot Peening Quality Research for Structure Parts Made by 15-5PH Steel

15-5PH材料结构件表面喷丸强化后存在粗糙度超差、色差和尖角部位塌边等问题,通过分析和试验验证,零件喷丸后的粗糙度跟喷丸强度没有直接关系,而跟影响喷丸强度的参数,包括空气压力、丸流量、喷枪角度有直接关系。喷丸后粗糙度会随着空气压力的降低而降低,随着丸流量的降低而升高,且喷丸角度为90°时,喷丸后粗糙度最佳。色差及塌边问题的改善,需要在工装设计时,保证喷丸面完全暴露,避免喷丸面多次重复装夹,从而产生重叠区的情况,同时工艺参数设定方面,零件尖边位置,应选用小的喷丸强度,从而减小丸料束对尖边位置的冲击,在喷丸轨迹设定方面,减少丸料束与尖边位置的接触时间。

Poor harshness, color difference and turnup of sharp edge areas were found after structure parts of 15 -5PH steel were shot peened. After analysis and test verification, it is found that the harshness of the parts after shot peening is not directly related to the shot peening intensity, but it is affected by shot peening parameters,including air pressure, flow and angle of shot peening. The harshness after shot peening decreased with the decrease of air pressure,but increased with the decrease of flow. When the shot peening angle is 90°,the best harshness can be obtained. In order to avoid the color difference and turnup after shot peening,the installation equipment should be improved to ensure the whole surface for shot peening will be exposed, and the shot peening surface should avoid repeated clamping and overlapping area. In addition,the shot peening parameters should be improved. For sharp edge areas of the parts,the shot peening intensity should be small to reduce the impact of balls on sharp tips, and the shot peening path should be adjusted to decrease the impact time of balls on sharp tips.