US 4,936,719 AGranted

Cutter and indexable on edge inserts with aligned corners and staggered serrated edges

AssigneeGreenleaf Corporation

InventorRobert W. Peters

Life of this patent

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Abstract

A rectangular insert of cutting material having top and bottom surfaces intersected by longitudinal edge surfaces to form four main longitudinal cutting edges. The top and bottom surfaces have ribs normal to the edge surfaces at each corner and sinusoidally spaced ribs normal to the edge surfaces starting at graduated distances from each corner rib so that when the inserts are stacked edgewise in different index positions, the corner ribs register with each other and the other ribs are out of phase with each other. The ribs of the cutting edges all extend edgewise of the bit or in the width direction so that the width of the insert is available to take the cutting thrust. When four of the inserts are stacked edgewise, each in a different one of the four index positions, the corners of the bits are all in alignment, thereby providing the finish of four identical inserts and the serrated edges provided by the sinusoidal ribs are in staggered relation so that each rib takes a fine chip which reduces the chattering.

An indexable on edge insert adapted to be supported on a flat platform on a cutter body and crowded edgewise against positioning means on said platform,

said insert comprising a generally rectangular imperforate block of cutting material having top and bottom surfaces alternatively adapted to rest on and be supported by said platform and having leading and trailing elongated longitudinal edge faces along opposite side edges constituting the cutting faces of four main cutting edges defined by the intersections of said edge faces with said top and bottom surfaces and having short end edge faces between said top and bottom surfaces at opposite ends of said longitudinal edge faces, said end edge faces being adapted to about said positioning means to locate the insert endwise on said platform,
said insert having four index positions with two positions having the active main cutting edges at the intersection of the top surface with opposite longitudinal edge faces of the insert when indexed so the bottom surface rests on the platform and with the other two positions having the active main cutting edges at the intersection of the bottom surface with opposite longitudinal edge faces of the insert when indexed so the top surface rests on the platform,
said top and bottom surfaces having arcuate corner ribs at each end normal to said longitudinal edge faces and extending in the width direction edgewise across said block, the corner ribs registering with each other when the inserts are stacked edgewise against each other in different index positions and being tangent to the end edge faces,
said top and bottom surfaces further having other ribs normal to said longitudinal edge faces and extending in the width direction edgewise across said block which provide serrated cutting edges when viewed in section in a plane parallel to said longitudinal side edges and normal to said top and bottom surfaces, the other ribs are out of phase with each other when the inserts are stacked edgewise against each other in different index positions with corner ribs in alignment.

1 more element

Facts

Application

06/186,262Filed 11 Sep 1980 · continuation in part

Priority

24 Aug 1976

Granted

26 Jun 1990

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

B23C 5/202
With removable cutter bits or teeth or cutting inserts: plate-like cutting inserts with special form
B23C 5/2243
With cutting inserts clamped by a clamping member acting almost perpendicular on the cutting face: for plate-like cutting inserts
B23C 2200/085
Rake or top surfaces: discontinuous
B23C 2200/125
Side or flank surfaces: discontinuous

Abstract

Claims10