Method and apparatus for the production of machine tools
OwnerFrank F. Erdelyiinventor
Life of this patent
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Abstract
A method and apparatus as disclosed, to produce a work piece, for example -- a twist drill or the same with inside cooling channels by means of a core matrix or core pins incorporated with the deforming pass, instead of using fusable metal filling. The points of the core matrix or core pins are located in the narrow pass of the forming caliber and remain fixed until the work piece is processed. At the end of the forming process, the work piece with its inside, open cooling channels, is expelled and a new operation starts.
Claims20
A method for chipless production of twist drills having inside, open cooling channels, comprising the steps of:
- providing an elongate blank having at least one bore formed therein,
- maintaining said bore free of filling metal while forging at least one spirally shaped flute in the outer surface of said blank by engaging said outer surface with forging tool means at a forging plane and producing relative longitudinal movement between said blank and said forging plane, and
- simultaneously providing core matrix means within said at least one bore, said core matrix means having an outer core forming area, and positioning said core forming area at said forging plane during the forging of said at least one spirally shaped flute whereby at least one continuous elongate open channel is formed within said drill simultaneous with the formation of said at least one spirally shaped flute.
An apparatus for forming from an elongate blank having at least one longitudinal bore twist drills having a plurality of longitudinal cooling channels in the interior thereof and at least one spirally arranged flute on the outer surface thereof, said apparatus including forging means for engaging the outer surface of an elongate blank member and for forging said at least one flute therein, means for moving said blank axially relative to said forging means, and core matrix means extending axially into the at least one bore formed in said blank, said core matrix means including a plurality of projecting means having portions lying in the forging plane of said forging means, said projecting means being spaced apart from each other to provide a plurality of longitudinally extending cooling passages in said drill as said blank is moved relative to said forging plane, the outer surfaces of said core matrix portions conforming to the cross-sectional configuration of said passages.
Dependencies are inferred from the claim text.