Tungsten Carbide Gear Hob’s Basic Worm Introduction

Details: Category: Tungsten Information; Published on Monday, 27 October 2014 18:51; Written by xjq; Hits: 469

Tungsten carbide gear hob’s bilateral blades is the intersection between the rake face and the lateral shovel surface, and it is located on the spiral surface of the worm, which is also called the basic worm of hobs. The basic worms of tungsten carbide gear hobs include three types as follows:

I. Involute worm

The tungsten carbide gear hob made by using involute worm has no teeth shape error and the gear being cut has higher precision. However, the hob manufacturing is more difficult with it.

II. Archimedes worm

It is more simple and convenient to manufacture a tungsten carbide gear hob with a Archimedes worm, as well as to test the hob teeth shape. However, there exists small teeth shape error. Fortunately, this kind of error is within the permitted range. Therefore, most of the basic worms of finish tungsten carbide hob in production are Archimedes worms instead of involute worms.

III. Straight sided normal worm

There is larger teeth shape error in tungsten carbide gear hob with straight sided normal worms instead of involute worms. Therefore, straight sided normal worms are often used in multithread hobs and roughing hobs.