Tungsten Carbide Hob Description

Tungsten carbide hob is composed of the hard phase WC and the binder phase Co, its edges helically arranged along cylinder or cone to manufacture cutting tools, which has been widely used in cylindrical gears, worm and other toothed cylindrical workpieces fabricating. According to different applications, tungsten carbide hob can be specifically divided into gear hobs, worm hobs, fixed mounted hobs, non-involute hobs and so on. Compared with common high-speed steel hobs, tungsten carbide hobs have better performance in cutting rate and button efficiency. Solid tungsten carbide hob has been widely used in watches and some of the precision instrument manufacturing industry, such as processing a variety of small module gear; medium modulus solid carbide hob and panels have been used for machining cast iron and bakelite gear; modulus < 3 tungsten carbide hob is also used in steel gear manufacturing; in addition, tungsten carbide hob is also can be used for fabricating hardened wheel (HRC50-62).

Tungsten carbide worm hob is a kind of special tool for worm manufacturing. Its main transmission type and basic parameters of the worm (including module, pressure angle, helix angle, pitch diameter, number of thread, etc.) should work with the same worm. When the worm is large in outer diameter, shaft-mounted hob can be made; when the worm is small in outer diameter, the hob can be made integral with the mandrel shank-type structure. Tungsten carbide fixed mounted hob has different profiles, which only the last one button is the precise button. Gullet button and forming a workpiece identical to alveolar milling method of cutting a workpiece, the rest of the button are for rough cutting and the movements is as same as the gear hob. In addition, forming hob can effectively avoid the exhibition to the transition curve tooling generated the root, especially the ratchet hob. The mechanism of non-involute hob is similar to the gear hob, such as spline hob can be used for processing rectangular teeth, involute or triangular tooth spline shaft, which has better machining precision and efficiency than forming cutters. And it also can be used for arc gears, cycloid gears and sprockets manufacturing. 

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