一、工件加工难度需要加工的方牙蜗杆的尺寸与要求如图1所示。这一根方牙蜗杆在加工工艺上的难度很大。(1)导程较大,退刀槽的宽度相对而言较小,在车床上加工时易撞刀;(2)牙型为方牙,故切刀的轴向顶力较大,易将工件顶弯;(3)导程S=7.73,车床的挂轮难配,且是近似的,带有一定的理论误差;(4)两牙侧的表面粗糙度要求较高,须由螺纹磨床加工才能达到,但一般中小型厂无这种精密设备。二、专用设备为了解决这一难关,笔者设计了一个简易的非标设备,利用阿基米德螺旋线展成三角形原理,加工出合格的产品。加工时,班产量比车床提高3～5倍,很 First, the difficulty of processing the workpiece The need to process square tooth size and requirements shown in Figure 1. This root square worm is very difficult to process. (1) larger lead, the width of undercut relatively small, easy to hit the knife in the lathe machining; (2) teeth for the square tooth, the cutter axial force is larger, easy to (3) lead S = 7.73, lathe wheel is difficult to match, and is approximate, with a theoretical error; (4) the two flanks of the surface roughness is higher, by the thread grinder Processing can be achieved, but generally small and medium-sized factories without such sophisticated equipment. Second, special equipment In order to solve this difficult situation, the author designed a simple non-standard equipment, the use of Archimedes helix into triangle principle, the processing of qualified products. Processing, the class output increased 3 to 5 times than the lathe, very