单颗磨粒的冲击磨损理论及实验研究  

Theoretical and experimental studies of the wear based on single- particle impacting

作　　者：宋卫[1] 袁巧玲[1] 戴勇[1] 钟和冬 

机构地区：[1]浙江工业大学特种装备制造与先进加工技术教育部浙江省重点实验室,浙江杭州310014

出　　处：《制造技术与机床》2015年第8期118-123,共6页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基会资助项目(51305399)

摘　　要：针对螺旋式约束磨粒流抛光的机理研究,基于ANSYS建立了单颗磨粒的冲击模型,选用铝合金作为工件的材料,并建立相应的Johnson-Cook弹塑性模型,分析单颗磨粒对材料的冲击磨损情况,并对颗粒的冲击磨损特性进行了实验研究。结果表明:对于弹塑性金属材料,撞击初期主要是发生弹塑性变形,形成压坑与变形唇,经多次碰撞挤压后,最终以小块金属剥落而产生磨损。在一定冲击角度(颗粒冲击轨迹与水平面的夹角)下工件表面材料磨损量较高,随着磨粒碰撞速度和碰撞次数的增加材料磨损量增大。螺旋式约束磨粒流通过改变颗粒的冲击轨迹能有效提高工件表面的加工效率与质量。In order to research the polishing mechanism of spiral bound abrasive flow, a model for single - particle impacting is established by using ANSYS, adopting aluminum alloy as the material of working efficien- cy, Johnson- Cook elastic -plastic material model is established, analyse the impact wear of surface material based on Single - particle, and study experimentally the property of impact wear. The results show that the initial impact occurres mainly as elastic - plastic deformation and form pit and deformed lip for the elastic - plastic material, after several impacting, the working efficiency surface is flaking and wear with pieces of metal at final, it would be a higher material removal when particle impact within a certain range angle（ an angel between particle impact trajectory and horizontal plane ）, it will increase the amount of material removal with the increase of impact velocity and the number of impacting, the change of impact trajectory of particles can effectively improve machining efficiency and the surface qual- ity of working efficiency

关 键 词：螺旋式约束 有限元 Johnson-Cook 材料磨损 

分 类 号：TG115.58[金属学及工艺—物理冶金]