摘要
分析了点磨削加工表面形貌及其精度的几种影响因素。研究发现:砂轮速度和磨削深度对表面粗糙度的影响都可归结为未变形切屑厚度的改变。减小点磨削倾斜角,可以减小未变形切屑厚度,从而得到理想的表面粗糙度。加大磨削深度和轴向进给量可提高材料去除率,但会造成粗糙度增大。这可归结为砂轮有效磨粒数的减少导致工件的表面粗糙度降低。点磨削通过改变倾斜角大小来增加参与磨削的有效磨粒数,保证高材料去除率的同时获得良好表面质量。增加光磨次数和应用倾斜型砂轮都增加了磨粒和工件表面轮廓突峰的接触次数,对于改善表面粗糙度十分有益。
This study discussed several influencing factors on surface roughness and machining precision in quick-point grinding. It is found that the surface roughness influenced by wheel speed and grinding depth can be attributed to the changing of undeformed chip thickness. The ideal roughness can be obtained by reducing grinding inclined angle which reduced undeformed chip thickness. Increasing grinding depth and axial feed rate can improve material removal rate, but at the same time, the roughness is deteriorated, which is possibly caused by the decrease of the number of active grains. By controlling the inclined angle to enlarge the number of active grains, a higher material removal rate is guaranteed, and a better grinding surface is obtained. In addition, the contact times of grains and peaks of workpiece surface profile are increased by increasing the times of spark out and using inclined wheel, which is helpful to decrease the surface roughness.
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2009年第4期39-43,47,共6页
Diamond & Abrasives Engineering
基金
国家自然科学基金资助项目(50775032)
关键词
表面粗糙度
快速点磨削
倾斜型砂轮
未变形切屑厚度
有效磨刃数
surface roughness
quick-point grinding
inclined wheel
undeformed chip thickness
number of active grains
