铣齿断续切削机理的研究  

Mechanism of Intermittent Cutting in Gear Milling

作　　者：张金[1] 黄筱调[1] 彭琪[1] 陆慧慧[1] 

机构地区：[1]南京工业大学机械与动力工程学院,南京210009

出　　处：《机械工程学报》2011年第13期186-192,共7页Journal of Mechanical Engineering

基　　金：国家科技重大专项(2010ZX04011-032);江苏省科技型企业技术创新资金(BC2009012)资助项目

摘　　要：大模数齿轮铣削具有多刃断续切削和变切屑厚度等特点,属于典型的非自由强力切削。主要从切削力、切屑形态、表面质量等方面对铣齿断续切削的机理进行研究。采用指数经验模型,应用微段切削刃受力积分获得单个刀片瞬时合成转矩,随后考虑刀盘上刀片的分布情况,获得刀盘周期性的载荷,提出铣齿断续切削转矩的计算模型。应用间接测量的试验方法,采集三相异步电动机的主轴输入电流,重构得到切削力,另外通过试验测量出切削变形比,应用理论公式获得切削力。将试验数据和理论计算结果与计算模型进行比较,验证了铣齿加工切削转矩模型的正确性。对切削过程中的残余高度进行几何分析,获得其计算方法。初步完成对铣齿断续切削机理的分析,对铣齿加工精度提供指导作用。Large module gear milling has the features of multi-edge intermittent cutting and variable chip thickness,thus belonging to typical non-free heavy cutting.The mechanism of intermittent cutting in gear milling is studied mainly from the aspects of cutting force,chip shape and surface quality.The instantaneous synthetic torque of a single blade is obtained by using the exponential empirical model and the stress integral of micro-segment cutting edge,and then the distribution of blades on the cutterhead is considered,the periodic load of cutterhead is obtained,and the calculation model of intermittent cutting torque is proposed.Test method of indirect measurement is used,the spindle input current of three-phase asynchronous motor is collected,and the cutting force is obtained by reconstruction.Moreover,the cutting deformation ratio is measured through tests,and the cutting force is obtained by use of theoretical formula.The test data and the theoretical calculation result are compared with the calculation model,which verifies the correctness of the model of cutting torque in gear milling.Geometric analysis of the residual height in the cutting process is carried out,and the calculation method thereof is obtained.The analysis on the mechanism of intermittent cutting in gear milling is preliminarily completed,which provides guidance for the gear milling accuracy.

关 键 词：非自由切削 铣齿 可转位刀具 微段切削刃 切削变形比 

分 类 号：TH122[机械工程—机械设计及理论]