Procedure to Make Tungsten Carbide Cutting Tools Ⅸ

In last part we know that to obtain a prolonged tool’s life, tungsten carbide cutting tools are coated with layers of wear resistant materials via chemical vapor deposition in a vacuum furnace. We go on to explain PVC technology.

PVD-Physical Vapor Deposition

The inserts are mounted on racks so they are separated from each other. Each rack rotates and the whole assembly of racks revolves within the furnace, so every surface of the tungsten carbide cutting tools is exposed to the deposition process. The furnace is evacuated. Strong negative charge is applied to the tungsten carbide cutting tools. A piece of titanium, or titanium and aluminum is installed on the wall or floor of the furnace. The metal is vaporized by either an electric arc or an electron beam, liberating the positively charged metal ions. These ions are attracted to the negatively charged inserts. Nitrogen and methane are added as appropriate, to achieve the different types of coatings.

PVD coatings are typically about 2-4 microns thick. Different manufacturers use different numbers of layers. When the inserts are removed from the furnace they may be ground again, or directly packaged and shipped.

Tool manufacturers are meeting the pressures for ever increasing feeds and speeds, and the need for longer tool life and lower costs, by continually improving the designs of tungsten carbide cutting tools and developing better and better coating technologies.

 (The end -This article is divided into several parts and this is part 9, for part 8 please refer to http://news.chinatungsten.com/en/tungsten-information/80278-ti-10331)

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