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Insert-exchangeable, rotary tool and throwaway insert

  • US 6,884,006 B2
  • Filed: 05/22/2002
  • Issued: 04/26/2005
  • Est. Priority Date: 05/25/2001
  • Status: Expired due to Term
First Claim
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1. A throwaway insert detachably attached to an insert-exchangeable, rotary tool, comprising substantially square-shaped face and bottom surface and an outward curved flank on each side surface, said throwaway insert having a positive-type shape in which an outward curved edge line formed by said face and said flank serves as a cutting edge, each flank having in a substantially center portion a flat surface portion extending to said bottom surface without contacting with said cutting edge, and a major cutting edge formed by said outward curved edge line circularly extending from its lowermost point toward a periphery of said tool when said insert is attached to said insert-exchangeable, rotary tool, such that it has a negative radial rake.

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