Method and apparatus for manufacturing a blank for a rotary...

Details Method and apparatus for manufacturing a blank for a rotary... Method and apparatus for manufacturing a blank for a rotary...

2008-05-13

2008-05-13

Tsang-Foster, Susy (Department: 1753)

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

C408S230000, C076S108600, C425S078000

Reexamination Certificate

active

10857499

ABSTRACT:
A blank for a rotary tool for chip removing machining, such as a helix drill or an end mill is formed by advancing a mixture of hard metal powder and carrier through an extrusion passage. The mixture is fed past a core having pins secured thereto for forming respective internal holes through the mixture. Then the mixture is advanced through a rotary part that is rotating about a center axis of the extrusion passage, wherein the rotary part and the internal holes become twisted to a predetermined pitch. The mixture is also advanced past a plurality of shaping parts which project transversely into the extrusion passage for shaping exterior chip flutes in the mixture, e.g., by embossing or cutting. The mixture is allowed to harden into a green body, and the green body is then sintered to form a blank.

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