一、前言在近代国防工业和机械制造中,有一些特种蜗杆(例如方牙蜗杆等),在现有的蜗杆磨床和螺纹磨床上,是不可能进行磨削的,这是由于这些机床的结构限制,无法使上述的蜗杆避免螺纹根部出现过渡曲线和顶部发生齿形干涉。英国著名的马屈克斯(Matrix)工厂生产的蜗杆磨床说明书中声称“某些螺纹,例如方牙螺纹,从几何性质来说,是不可能用盘形铣刀或 I. INTRODUCTION In the modern defense industry and machinery manufacturing, there are some special types of worm (such as square worm, etc.) that can not be grinded on existing worm grinders and thread grinders because of the structure of these machines Limit, can not make the above-mentioned worm to avoid the root of the thread appears transition curve and the top tooth-shaped interference occurs. The description of the worm grinder manufactured at the famous Matrix factory in the United Kingdom states that "certain threads, such as square threads, are geometrically impossible to use with a disk cutter or