前混合水射流喷丸表面粗糙度的试验研究

Test research of premixed water jet shot peening surface roughness

选择喷丸压力、喷嘴扫描速度、靶距为影响因素,选用直径为0.25mm的玻璃弹丸,应用前混合水射流对45钢和2Al1铝合金材料进行喷丸试验;采用针描法测量喷丸表面粗糙度,利用扫描电镜观察喷丸表面宏观形貌特征.结果表明,前混合水射流喷丸会使受喷材料的表面粗糙度明显增大,且表面粗糙度随着喷丸压力的增加而增大,随着扫描速度的增加而减小,并存在最大表面粗糙度靶距;在整个喷丸表面上出现宽度近似相等的"垄沟"状条形变形带,并布满了无数个形状不规则的无间隙的冲击凹坑,粗糙度曲线呈现"锯齿"形状,它与喷丸表面"垄沟"状形貌特征十分吻合.

Chosen shot peening pressure, nozzle scanning velocity, target distance as effect factors, chosen glass pill whose diameter was 0.25 mm, did shot peening test to 45 steel and 2All aluminum alloy material by premixed water jet. Adopted stylus method for measuring shot peening surface roughness, observed macroscopically shape character of shot peening surface by scanning electron microscope. The result indicates that the surface roughness of peened material obviously augments because of premixed water jet shot peening, and surface roughness augments as the increase of shot peening pressure and minishs as the increase of scanning velocity, the biggest surface roughness target distance exists. The bar distortion area which is ＂furrow＂ shape with approximatively equal width appears on the whole shot peening surface, and countless non clearance impacting concave whose shape is anomalous bestrews on the whole shot peening surface, roughness curve presents ＂saw tooth＂ shape, it quite inosculates with ＂furrow＂ shape character on shot peening surface.