Finishing insert with improved chip control

  • US 4,411,565 A
  • Filed: 05/08/1981
  • Issued: 10/25/1983
  • Est. Priority Date: 05/08/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. A finishing insert for use with an indexable cutting tool comprising:

  • a flat wafer of cutting material of generally polygonal plan form, having a pair of opposed faces and a plurality of upstanding side walls extending therebetween with the juncture between each said side wall and a face defining a peripheral cutting edge, wherein each peripheral cutting edge adjacent said one face is generally trough-shaped in configuration, with the distal ends of said trough configuration being defined by said sloping corner portions and with the central portion of said trough configuration being defined by a generally planar undercut area, said planar undercut area being disposed substantially parallel to said opposed insert face, said polygonal wafer further including a plurality of radiused corner portions with at least one of said insert faces being non-planar with the corner portions thereof sloping inwardly towards the opposed insert face, each of said corner portions of said nonplanar face including a pair of abutting, generally triangular chip groove portions and a central triangular land area disposed between each pair of abutting chip groove portions, each chip groove portion being spaced from the adjacent cutting edge of the insert so as to define a side land area, said central triangular land area being generally planar and disposed parallel to said opposed insert face, each said central triangular land area including a pair of side edges and a vertex, with an imaginary line bisecting said vertex being disposed substantially normal to the radiused corner portion associated therewith, and with said side edges of each said triangular land area being disposed at an angle relative to the adjacent cutting edges of the insert such that the width of each said chip groove portion increases from its end adjacent its respective corner portion to its opposed end, and with the depth of each chip groove portion increasing from its end adjacent its respective corner portion to its opposed end whereby said insert may be utilized to machine finishing cuts through a range of feed rates while simultaneously reducing cutting forces.

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