Research on Meso-scale Cutting Thickness Model Influenced by the Total Radical Run-out of Cutting-Edge
首发时间:2013-06-03
Abstract:The calculation accuracy of instantaneous cutting thickness model influences the prediction accuracy of meso-scale cutting force model directly. Most of the existing instantaneous cutting thickness models in meso-scale cutting process are based on the trochoidal trajectory of the cutting-edge, which take spindle run-out and elastic recovery of workpiece into account but neglect the influence of cutter installation errors, cutter-holder manufacturing errors, system rigidity and so forth on the instantaneous cutting thickness. A new method of measuring total radical run-out of cutting-edge is proposed in this paper, which is obtaining the total radical run-out of cutting-edge based on the experiment and establishing the prediction model of the total radical run-out of cutting-edge. Then considering the effect of cutting-edge trochoidal trajectory, total radical run-out of cutting-edge and minimum cutting thickness, the calculation model of the nominal instantaneous cutting thickness and cumulative instantaneous cutting thickness during the actual cutting process are established, and the single-tooth cutting phenomenon in micro-cutting process is analyzed. The research in this paper can make theoretical preparation for further study on micro-milling force model.
keywords: Total radical run-out of cutting-edge meso-scale instantaneous cutting thickness cutting trajectory
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受刀尖径向总跳动度影响的介观尺度切削厚度模型研究
摘要:瞬时切削厚度模型的计算精度直接影响介观尺度切削力模型预测精度。现有介观尺度切削过程中的瞬时切削厚度模型大多基于刀尖摆线运动轨迹,考虑主轴径向跳动及材料弹性回复建立,而未考虑刀具安装误差、导杆制造误差及系统刚度等因素对瞬时切削厚度的影响。本文提出了一种新的测量刀尖径向总跳动度的方法,基于实验得出微细切削过程刀尖径向总跳动度,并建立刀尖径向总跳动度预测模型。随后考虑切削刃摆线轨迹、刀尖径向总跳动度及最小切削厚度的影响,建立名义瞬时切削厚度和实际切削过程瞬时累积切削厚度的计算模型,并分析微细切削过程中的单齿切削现象,为进一步研究微细铣削力模型作好理论准备。
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