Cutting insert

Abstract

A cutting insert, especially for milling cutters and the like, and which is to be mounted in a tool holder in a negative radial rake position. The insert is indexable and invertable and has a cutting edge means. The peripheral wall adjacent the cutting edge means has recesses therein which interrupt the cutting edge means. The depth of the recesses becomes shallower as the recesses extend away from the cutting edge means until the recess terminates in the peripheral wall. An insert having at least two cutting edges is described wherein the insert has at least two cutting edges and the recesses interrupting one cutting edge are staggered relative to the recesses interrupting the other cutting edge when the cutting edges are viewed in superposed relation.

What is claimed is: 
     
       1. A cutting insert comprising: a body of hard wear resistant material having spaced substantially parallel faces that are polygonal when viewed in plan; a peripheral wall extending between said faces; cutting edge means comprising at least two cutting edges.Iadd.; each cutting edge .Iaddend.formed at the juncture of said peripheral wall and .[.at least.]. one of said faces, said peripheral wall having recesses formed therein interrupting said cutting edge means; said recesses interrupting one cutting edge of said insert being staggered relative to the recesses interrupting the other cutting edge of the insert when said cutting edges are viewed in superposed relation; the depth of said recesses in said peripheral wall decreasing as the recess extends away from said cutting edge means; and said two cutting edges formed one on each face along the same side of said insert. .[.2. A cutting insert according to claim 1 wherein said faces are polygonal when viewed in plan and said cutting edge means comprise at least two cutting edges..]. .[.3. A cutting insert according to claim 2 wherein the recesses interrupting one cutting edge of said insert are staggered relative to the recesses interrupting the other cutting edge of the insert when said cutting edges are viewed in 
     
     
        superposed relation..]. 4. A cutting insert according to claim .[.3.]. .Iadd.1 .Iaddend.in which said recesses are uniformly spaced along the 
     
     
        peripheral wall of said insert. 5. A cutting insert according to claim 4 in which said recesses in one cutting edge are asymmetrically disposed about an axial centerline of the insert so that the recesses of one cutting edge are staggered relative to the other cutting edge when viewed 
     
     
        in superposed relation. 6. A cutting insert according to claim .[.3.]. .Iadd.1 .Iaddend.wherein the number of recesses interrupting one cutting edge are equal to the number of recesses interrupting the other of two 
     
     
        said cutting edges. 7. A cutting insert according to claim .[.3.]. .Iadd.1 .Iaddend.wherein the number of recesses interrupting one cutting edge are unequal to the number of recesses interrupting the other of two said 
     
     
        cutting edges. 8. A cutting insert according to claim .[.2 wherein said.]. .Iadd.1 further comprising .Iaddend.two cutting edges .[.are.]. angularly 
     
     
        related and adjacent to one another. 9. A cutting insert according to claim 1 wherein said recesses become narrower as they extend away from 
     
     
        said cutting edge means. 10. A cutting insert according to claim 1 in which said recesses terminate in said peripheral wall without interrupting 
     
     
        the other of said one of said faces. 11. A cutting insert comprising: a body of hard wear resistant material having spaced substantially parallel faces that are polygonal when viewed in plan; a peripheral wall extending between said faces; cutting edge means comprising at least two cutting edges.Iadd.; each cutting edge .Iaddend.formed at the juncture of said peripheral wall and .[.at least.]. one of said faces, said peripheral wall having recesses formed therein interrupting said cutting edge means; said recesses interrupting one cutting edge of said insert being staggered relative to the recesses interrupting the other cutting edge of the insert when said cutting edges are viewed in superposed relation; the depth of said recesses in said peripheral wall decreasing as the recess extends away from said cutting edge means; and said two cutting edges are formed one on each of two opposing sides on .[.the same face.]. .Iadd.opposing faces .Iaddend.of the insert.