Cemented Carbides Tool for Cutting, Punching or Nibbling (2)

A cemented carbide tool for cutting, punching or nibbling which, by means of a special way of manufacturing, has surprisingly better properties in comparison to those of conventional tools.

The normal wear pattern of a steel nibbling punch is that material by abrasion is worn off and moved up along the punch. Because of the wear pattern, the punch turns conical which in turn finally causes an increased friction force that changes the cutting quality to an unacceptable level. When using cemented carbide punches, this wear process is considerably slower, but with the same result as obtained by the used of steel punches. Due to the brittleness of the cemented carbide the risk of fracture is great. As a result, cemented carbide punches are used only exceptionally.

A cemented carbide preferably for use in rock drilling but also for wear parts and other parts exposed to wear. It is characterized by a core containing eta-phase surrounded by cemented carbide free from eta-phase.


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