【作者】 罗蒙；

【导师】 陈明； 胡祖光；

【作者基本信息】 上海交通大学 ， 航空宇航制造工程， 2007， 硕士

【摘要】 毛刺是金属切削过程中最普遍的现象之一,对零件的加工质量及后续的装配、使用有很大的影响,且去毛刺过程费时费力,是整个切削加工过程和自动化流水生产线的最大障碍之一。本文结合实验和仿真结果,对金属切削过程中毛刺形成机理进行深入研究,针对不同的材料,和不同的加工方式(车削、铣削和钻削)提出主动控制毛刺加工的基本方法。本文首先以理论的形式,结合毛刺形成和切屑的形成异同之处进行总结、对比,得出毛刺形成的最根本原因是由于工件材料在刀具加工的最末段发生严重的塑性变形。毛刺的产生宏观上是由于产生了切削过程中的第四变形区;微观上是由于在加工的最末端工件背靠支撑强度不够,材料颗粒不断发生滑移、位错,切屑围绕工件端部某一点发生旋转而没有折断残留在工件上形成了毛刺。本文从理论对毛刺形成机理出发,对车削、铣削和钻削加工过程的毛刺进行实验分析。通过改变加工切削用量(切削速度,进给速度,切深),刀具状况(材料、几何形状、涂层状况、磨损状况),加工状态及工件形状,工艺路线,考察了对加工和零件表面质量影响最大的出刀位置毛刺。实验结果的分析引入了加工过程中切削力,切削变形等手段,对毛刺的形成进行了深入的研究。更多还原

【Abstract】 Burr is one of the most common phenomenons in the metal cutting process, which also does a bad contribution to cutting quality, assembling and application in the later process. Deburring operations are time and money-consuming processes, which badly affect the automatic pipeline manufacture and metal cutting process. Combination with experiments and simulations, this paper does a deep research on burr formation, which focused on different materials and different cutting method, (such as turning, milling and drilling), and then several active control methods to minimize burr size are presented in the end.By inducing difference and similarity between burr and chip formation in the metal cutting process, this paper concludes that burr formation because the heavily plastic deformation of material when the tool achieves the end of workpiece. In macroscopic view, burr produces due to the appearing of the fortieth deformation zone; in microscopic view, it produces due to weakness of support strength in the end of the workpiece, the particles of the material do slip and dislocation all the time, the chip rotates around a point and then burr produces.Secondly, according to the theory analysis, this paper does lots of更多还原