Metal tools and implements – making – Blank or process – Drill
Reexamination Certificate
2008-03-11
2008-03-11
Ashley, Boyer D. (Department: 3724)
Metal tools and implements, making
Blank or process
Drill
C029S557000, C072S254000, C072S338000, C425S381000, C470S010000, C470S016000, C470S066000
Reexamination Certificate
active
10882385
ABSTRACT:
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.
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Ericsson Roine
Fair Jonathan
Kugelberg Jören
Micski Anders
Ashley Boyer D.
Drinker Biddle & Reath LLP
Landrum Edward
Sandvik Intellectual Property AB
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