Sandvik Intellectual Property Ab

Sandvik Intellectual Property Aktiebolag

Roine Ericsson

Jonathan Fair

Anders Micski

Jören Kugelberg

Jörgen Kugelberg

A method for manufacturing a rotary tool for chip removing machining with at least one chip flute that extends in the longitudinal direction of the tool. The method involves preparing a mixture of a cemented carbide, cermet or ceramics powder and a carrier, such as a polymer, and placing the mixture in an extruding machine. The mixture is extruded in a feed direction by means of a die to form the diameter of the mixture body. The mixture body passes against a chisel which forms a chip flute in the outer periphery of the mixture body by chip-removing machining. When the chisel is displaced away from the mixture body, a non-fluted shaft portion is formed. By rotating the mixture body while contacted by the chisel, a helical chip flute can be formed. Alternatively, the body could be twisted after a straight flute has been formed, whereupon the flute becomes helical.

Method and apparatus for making a rotary tool for chip removing machining

The present invention relates to a method for manufacturing a drill blank or a mill blank by extrusion, said method comprising the forming of a first blank portion (B) having external, axially extending external flutes and the forming of a further blank portion (B) in the shape of a shaft. The invention also relates to a device for manufacturing a drill blank or a mill blank. The method according to the invention is characterised by: extruding a first blank portion (B) having a free end and external flutes; allowing the extrusion to continue to supply further extruding mass into a cavity (), said supply of extruding mass completely filling out the external flutes of the first blank portion (B) to produce a second blank portion (B) integral with the first blank portion (B); allowing the extrusion to continue to produce a desired length of the first blank portion (B); and cutting off the first blank portion (B) at the end facing away from the second blank portion (B).

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Huddinge, Sweden

Roine Ericsson