Procedure to Make Tungsten Carbide Cutting Tools Ⅶ

In last part we know that the blank of a tungsten carbide insert comes into form with enough density and mechanical properties by sintering process. When we finally get a sintered tungsten carbide blank, we will go on to the machining process.

Machining

Before any tungsten carbide blank can be used as a tool, it has to be machined into a specific shape with a certain cutting function. Machining is any of various processes in which a piece of raw material is cut into a desired final shape and size by a controlled material-removal process. The three principal machining processes are classified as turning, drilling and milling. Other operations falling into miscellaneous categories include shaping, planning, boring, broaching and sawing.

For example, after the tungsten carbide inserts are removed from the furnace and cooled, they are dense and hard. After a quality control check, the inserts are usually ground or honed to achieve the correct dimensions and cutting edge. Honing to a radius of 0.001″ is typical, though some parts receive a cutting-edge radius of half a thousandth or as large as 0.002″, and some are left “dead sharp” as sintered.

But most of tungsten carbide cutting tools are much complex than a carbide insert, so they shall be machined in many different ways by different machining equipments with various machining tools. The modern equipment is the CNC machining center in high efficiency and precision, which can produce a final tungsten carbide drill in a complete sequence from grinding, cutting, boring , drilling, end milling to deburring, etc. The finished drill can be put into use directly, or go to the last process:coating.

 (To be continued-This article is divided into several parts and this is part 7, for part 6 please refer to http://news.chinatungsten.com/en/tungsten-information/80276-ti-10329; for part 8 please refer to http://news.chinatungsten.com/en/tungsten-information/80278-ti-10331)

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