基于瞬时铣削力的球头铣刀铣削力系数辨识

面向多轴铣削加工的铣削力预测,提出了基于瞬时铣削力的球头铣刀铣削力系数辨识方法.首先建立了铣削过程中刀具的瞬时坐标系来准确描述多轴加工中刀具的位置和位姿,在此基础上建立了球头铣刀任意位置和位姿的通用铣削力模型,即建立了铣刀刀刃微元的切削弧长,刀刃微元的切削宽度和瞬时未变形切削厚度的数学模型.然后根据铣削力模型推导了基于瞬时铣削力的铣削力系数辨识模型.最后通过铣削力系数辨识实验和铣削力仿真计算,验证了方法的正确性和可靠性.

Milling Force Coefficient Identification of Ball-End Milling Based on Instantaneous Milling Forces

In order to realize the milling force prediction of multi-axis milling， a new method based on the instantaneous milling force values was presented to obtain the specific milling force coefficients of ball-end milling. The instantaneous coordinate system of cutter was set up to precisely describe the position and posture of cutter during the process of milling. And on this basis the universal prediction model of milling， which includes the models of the edge length， the chip width in each cutting edge discrete element and the unreformed chip thickness， was established. Then according to the universal prediction model， the identification model of milling force coefficients based on the instantaneous milling force values was derived. The presented method was validated by experiments of milling force coefficients identification and the simulations of milling force.