超密齿面铣刀的铣削力波动特性及其影响

Cutting Force Fluctuation Characteristics of Ultra-Fine-Pitched Milling Cutters and Its Influence

提出了一种超密齿面铣刀概念,并推导了x和y方向的铣削力计算模型,分析了超密齿刀具铣削力及其波动规律.结果显示:随刀具的转动铣削力呈锯齿状变化,x向铣削力波动呈现两个山峰状,在三齿同时参与切削时波动最小.y向铣削力波动随初始切入角的增大先增大后减小,对比发现超密齿刀具铣削力波动远小于疏齿刀具.提出用单位体积材料所需切向铣削力大小来评价超密齿刀具和疏齿刀具性能.通过超密齿面铣刀的铣削实验验证了铣削力计算模型,并发现铣削力波动是影响工件表面粗糙度的因素之一,同时也反映出超密齿刀具的加工优越性.

Considering the low machining efficiency of traditional m illing cutters,an ultra-finepitched m illing cutter was developed,the cutting force models in the x and y directions were established,and cutting force and its fluctuation were discussed by using the model.The results showed that during the cutter rotation,the cutting force fluctuation along the feed direction increases at first and then decrease w ith the increase of entrance angle,and then repeats when it decreases to the m inim um.For the cutting force fluctuation vertical to the feed direction,it increases at first then decreases w ith the increase of entrance angle.The results showed that ultrafine-pitched m illing cutter is far superior to coarse-pitched one.Furthermore,cutting force per material removal rate was put forward to evaluate the performance of two kinds of cutters.Experiments by using the ultra-fine-pitched m illing cutter validate the cutting force model and indicate that force fluctuation has a great effect on the surface roughness of workpiece,which confirms the advantage of ultra-fine-pitched m illing cutter.