Procedure to Make Tungsten Carbide Cutting Tools Ⅴ

In last part we know how the grade powder is gained by mixing up the grade ingredients in a ball mill and drying them in a spray dryer, which also influences much the final quality of tungsten carbide cutting tools. Here we explain the procedure of compacting.

Compacting or Pressing

The grade powder is consolidated into a compact by two main routes: pressing in rigid dies (uniaxial pressing) and isostatic pressing in flexible molds (compaction under hydrostatic pressure). Other techniques, such as powder rolling, cold extrusion, explosive compaction, slip casting, vibratory compaction, or metal injection molding, have gained no industrial importance.

Tungsten powder is not easy to compact due to its relatively high hardness and difficult deformation. Nevertheless, in most cases compaction is performed without lubricant to avoid any contamination by the additive. The resulting compacts are generally sufficiently strong so that they can be handled without breaking. For machining the part, it must be pre-sintered beforehand.

Take tungsten carbide inserts as an example. The grade powder goes into insert shaped molds specially designed to allow for the shrinkage that will happen later on in the process. The powder is compressed into the molds, in a process similar to how pharmaceutical tablets are formed.

 (To be continued-This article is divided into several parts and this is part 5, for part 4 please refer to http://news.chinatungsten.com/en/tungsten-information/80274-ti-10325; for part 6 please refer to http://news.chinatungsten.com/en/tungsten-information/80276-ti-10329)

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