Bit exchangeable drill
AssigneesSumitomo Electric Hardmetal Corp., Fuji Jukogyo Kabushiki Kaisha, Sumitomo Electric Industries, Ltd.
InventorsTakumi Tamura, Masahiro Yoshida, Yoshiharu Kaimori, Yuzuru Ono
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Abstract
A bit exchangeable drill includes a detachable cutting head at the tip of a drill body, and the cutting head includes a cutting edge extending linearly from a rotation center to a radial outer end in axial end view, and a helical flute. At a rake face continuous with the cutting edge, a thinning face inclined relative to the rotation axis and rendering an axial rake angle of the cutting edge negative is formed entirely from a radial inner end to a radial outer end of the cutting edge.
Claims5
A bit exchangeable drill including a detachable cutting head at a tip of a drill body, said cutting head including a cutting edge extending linearly from a rotation center to a radial outer end in axial end view, and a helical flute, wherein
- a thinning face inclined relative to a rotation axis, and rendering an axial rake angle of the cutting edge negative is formed at a rake face continuous to said cutting edge, and said thinning face is arranged entirely from a radial inner end to a radial outer end of said cutting edge.
A bit exchangeable drill including a detachable cutting head at a tip of a drill body, said cutting head including a cutting edge extending linearly from a neighborhood of a rotation center to a radial outer end in axial end view, and a helical flute, wherein said cutting edge has a chisel edge less than or equal to 0.5 mm,
- a thinning face inclined relative to a rotation axis, and rendering an axial rake angle of the cutting edge negative is formed at a rake face continuous to said cutting edge, and said thinning face is arranged entirely from a radial inner end to a radial outer end of said cutting edge.
Dependencies are inferred from the claim text.