New tooling for plasma cutting technology

When milling the edges of sheet intermediate products made of high strength manganese and other special steels and alloys with plasma preheating, milling cutters equipped with plates of metal-ceramic hard alloys are used. With plasma heating, it is most advisable to use cylindrical milling tools. The tooth of the milling tool cuts into the soft metal which reduces the unit loads on the cutting wedge of the tool. It becomes possible to use plates with the slope angle of the cutting edge equal or near zero, which considerably simplifies the making of the tool. The milling tool design makes it technologically efficient to produce basing surfaces for setting the cutting components. The through wedge grooves of the rings may be ground which produces very flat supporting surfaces and, therefore, high rigidity of the interface between the plate and the support. The use of tetrahedral plates with a flat forward surface with a 90 deg tip angle utilizes all eight cutting edges of the plate. The use of such milling tools with plasma preheating of the intermediate product insures high machining productivity even if the tool is equipped with hard alloy plates without tungsten.