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Tool holder with patterned hard shim forming indented seat and method

  • US 5,682,803 A
  • Filed: 02/23/1996
  • Issued: 11/04/1997
  • Est. Priority Date: 02/28/1995
  • Status: Expired due to Term
First Claim
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1. A cutting tool assembly comprising:

  • (a) a tool holder formed with an insert retaining pocket initially having a substantially smooth, planar pocket base wall;

    (b) a cutting insert of a substantially prismatic shape having an upper surface, a lower surface and side relief flank surfaces and a cutting corner defined therebetween; and

    (c) a shim generally corresponding in shape and size to said cutting insert and being of a material substantially harder than said tool holder, said shim having an upper supporting surface which supports said insert lower surface, and a lower bearing surface which bears against said pocket base wall, whereinsaid lower bearing surface is formed with a pattern of protrusions;

    said insert and said shim are releasably mounted in said pocket such that an operative cutting corner is disposed atop said pattern of protrusions, andsaid pattern of protrusions is adapted to penetrate said substantially smooth, planar pocket base wall and form an indented seating surface in at least a region supporting said operative cutting corner, upon application of a downward force on said insert.

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