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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/Re<1.0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.
In order to study the effect of cutting amount on the cutting force and the processing quality in the micro-milling process, a micro-milling process was carried out by using a 150μm diameter carbide micro-milling cutter.On the one hand, using the single factor experimental method, When the spindle speed, axial depth of cut and feed rate of each tooth on the cutting force of the law, the experiment found that the spindle speed and axial depth of cut is an important factor affecting the cutting force, and each tooth feed to minimize the impact.Each The ratio of tooth feed to the cutting edge radius, fz / Re, was used as a variable to study the size effect of the cutting specific energy. It was found that the cutting ratio increased as fz / Re decreased with fz / Re <1.0 On the other hand, the effect of fz / Re on the quality of micro-milling is studied from the aspects of glitch width and surface roughness, and the results show obvious size effect, with each When the ratio of fz / Re = 1.0, the surface roughness is the smallest, and the surface roughness is the smallest when fz / Re = The actual processing of a reasonable choice of cutting and analysis of micro-micro Cut size effect provide a theoretical basis.