中文摘要：

常规机床对螺旋锥齿轮的齿长曲率进行修正时,需从机床上拆装铣刀盘,并重新调整其行程直径,过程繁琐。对此利用国产四轴数控铣齿机,建立铣齿加工坐标系,以及径向刀位、切削滚比变化多项式。用轮齿接触分析（TCA）的方法,以被加工齿面的接触路径、传动误差作为评价目标,研究径向刀位、切削滚比的变化对齿长曲率修正的规律。TCA分析及铣齿实验结果表明,不改变铣刀盘直径,即可实现对齿长曲率的修正,同时可更加灵活地控制齿面接触路径与传动误差。

英文摘要：

For traditional machine,to modify spiral bevel gear tooth-profile lengthwise curvature,cutter must be disassembled and adjusted its diameter.This is a complicated process.On domestic-made 4-axis CNC spiral bevel gear machine,machining coordinates were set up,cradle radial setting and roll ratio polynomials were proposed.With tooth contact analysis（TCA） technology,considering contact lines and transmission errors,the polynomials were taken into TCA process to study lengthwise curvature correcting rules.TCA and milling experiment showed that lengthwise curvature modification could be achieved without changing cutter diameter,contact lines and transmission error could be controlled more easily.