Effect of High Speed Milling Process Parameters on the Milling Force and Surface Topography of AM50A Magnesium Alloy

高速铣削工艺参数对AM50A镁合金铣削力和表面形貌的影响

¹ Research Center of Contemporary Design and Advanced Manufacturing Technology, Yulin University, Yulin 719000, China
² School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an 710072, China

Received: 12 March 2017

Abstract

Within the scope of high speed milling process parameters, analyzed and discussed the effects of spindle speed, feed rate, milling depth and milling width on milling forces in the process of high speed milling of AM50A magnesium alloy. At the same time, the influence of milling parameters on the surface roughness of AM50A magnesium alloy has been revealed by means of the measurement of surface roughness and surface micro topography. High speed milling experiments of AM50A magnesium alloy were carried out by factorial design. Form the analysis of experimental results, The milling parameters, which have significant influence on milling force in high speed milling of AM50A magnesium alloy, are milling depth, milling width and feed speed, and the nonlinear characteristics of milling force and milling parameters. The milling force decreases with the increase of spindle in the given mill parameters. For the effects of milling parameters on surface quality of the performance, in the milling depth and feeding speed under certain conditions with the spindle speed increases the surface quality of AM50A magnesium alloy becomes better with the feed speed increases the surface quality becomes poor. When the spindle speed is greater than 12000r/min, the milling depth is less than 0.2mm, and the feed speed is less than 400mm/min, the milling surface quality can be obtained easily.

摘要

在给定高速铣削工艺参数范围内，分析讨论了AM50A镁合金高速铣削时主轴转速、进给速度、铣削深度和铣削宽度对铣削力的影响规律；同时通过对AM50A镁合金已加工表面粗糙度测量，研究了铣削参数对表面粗糙度的影响规律。采用析因实验设计的方法对AM50A镁合金进行了高速铣削实验，由实验结果分析可知，高速铣削AM50A镁合金时，对铣削力有显著影响的铣削参数为铣削深度、铣削宽度和进给速度，且铣削力与铣削参数之间存在非线性特征规律；在实验给定的铣削工艺参数范围内随主轴转速的增大铣削力呈下降趋势。铣削参数对表面质量的影响表现为，在铣削深度和进给速度一定的情况下随着主轴转速的增大AM50A镁合金表面质量变好，随着进给速度增大，AM50A镁合金铣削表面质量变差。当主轴转速大于12 000 r/min、铣削深度小于0.2 mm、进给速度小于400 mm/min的铣削参数条件下易获得较高的铣削表面质量。