微铣削切削力特性及表面质量的实验研究

发布时间：2018-10-10 07:45

【摘要】：为了研究微铣削加工过程中切削用量对切削力的影响规律及加工质量,采用直径150μm的硬质合金微铣刀进行了微铣削加工实验.一方面,采用单因素实验方法,研究了铣削微槽时主轴转速、轴向切削深度和每齿进给量对切削力的影响规律,实验发现主轴转速和轴向切削深度是影响切削力的重要因素,而每齿进给量的影响最小.以每齿进给量与切削刃刃口半径的比值fz/Re为变量,研究了切削比能的尺寸效应现象,发现随着fz/Re的减小,切削比能增大,当fz/Re1.0以后,切削比能急剧增大.另一方面,从毛刺宽度和表面粗糙度两个方面研究了fz/Re对微铣削加工质量的影响规律,其结果表现出明显的尺寸效应现象,随着每齿进给量的的减小,毛刺宽度和表面粗糙度均先减小后增大.当fz/Re=0.5时毛刺最小;当fz/Re=1.0时,表面粗糙度最小.本研究可以为实际加工中合理选择切削用量以及分析微铣削尺寸效应现象提供理论依据.
[Abstract]:In order to study the influence of cutting parameters on cutting force and machining quality during micro-milling process, the experiment of micro-milling with cemented carbide micro-milling cutter with diameter of 150 渭 m was carried out. On the one hand, the influence of spindle speed, axial cutting depth and feed per tooth on cutting force is studied by single factor experiment method. It is found that spindle speed and axial cutting depth are important factors affecting cutting force. The effect of feed rate per tooth is the least. With the ratio of feed per tooth to cutting edge radius fz/Re as variable, the size effect of cutting specific energy is studied. It is found that the cutting specific energy increases with the decrease of fz/Re, and the cutting specific energy increases sharply after fz/Re1.0. On the other hand, the effect of fz/Re on the machining quality of micro-milling is studied from two aspects of burr width and surface roughness. The burr width and surface roughness decrease firstly and then increase. When fz/Re= is 0.5, the burr is minimum, and when fz/Re= is 1.0, the surface roughness is the smallest. This study can provide a theoretical basis for the reasonable selection of cutting parameters and the analysis of micromilling size effect in practical machining.
【作者单位】：精密测试技术及仪器国家重点实验室(天津大学);
【基金】：国家自然科学基金资助项目(50935001)
【分类号】：TG54

【共引文献】