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US 12,172,219 B2Granted
Cutting insert having grooved top and bottom abutment surfaces with inner and outer pairs of wedge angles, and cutting tool
AssigneeIscar, Ltd.
InventorGil Hecht
Life of this patent
Estimating the term…
Abstract
A cutting tool used for turning operations is releasably secured to a tool holder. The cutting insert includes top and bottom insert surfaces, each surface including two pairs of insert wedge surfaces. The tool holder includes an insert pocket having a pocket top surface and a pocket bottom surface. When the cutting tool is assembled, only one of the two pairs of insert wedge surfaces of the insert top surface engages the pocket top surface, and only one of the two pairs of insert wedge surfaces of the insert bottom surface engage the pocket bottom surface.
Claims25
A cutting insert (10, 10′) having an insert longitudinal axis (A1), and comprising:
- a front insert surface (20) and an opposing rear insert surface (22);
- a peripheral insert surface (24) extending between the front insert surface (20) and the rear insert surface (22) and about the insert longitudinal axis (A1), the peripheral insert surface (24) comprising:
- a top insert surface (26) and an opposing bottom insert surface (32);
- a first insert side surface (40) connecting the top and bottom insert surfaces (26, 32);
- and
- a second insert side surface (44) opposing the first insert side surface (40) and connecting the top and bottom insert surfaces (26, 32);
- a longitudinal insert bisector plane (P1) which contains the insert longitudinal axis (A1) and passes midway between the first and second insert side surfaces (40, 44);
- an insert lateral axis (A2) passing midway in-between the top and bottom insert surfaces (26, 32), midway in-between the front and rear insert surfaces (20, 22) and through the first and second insert side surfaces (40, 44);
- an insert vertical axis (A3) contained in the longitudinal insert bisector plane (P1), passing midway in-between the first and second insert side surfaces (40, 44) and through the top and bottom insert surfaces (26, 32);
- and
- a first cutting edge (50) formed an intersection between the front insert surface (20) and the top insert surface (26);
- wherein:
- the top insert surface (26) has an elongated top groove (28) which comprises:
- an elongated outer pair of insert top wedge surfaces (30a, 30b) concavely converging in a direction from the first and second insert side surfaces (40, 44) towards each other, and defining an outer top angle Ot;
- and
- an elongated inner pair of insert top wedge surfaces (30c, 30d) located between the outer pair of insert top wedge surfaces (30a, 30b), concavely converging in a direction from the outer pair of insert top wedge surfaces (30a, 30b), and defining an inner top angle It;
- the bottom insert surface (32) has an elongated bottom groove (34) which comprises:
- an elongated outer pair of insert bottom wedge surfaces (36a, 36b) concavely converging in a direction from the first and second insert side surfaces (40, 44) and defining an outer bottom angle Ob;
- and
- an elongated inner pair of insert bottom wedge surfaces (36c, 36d) located between the outer pair of insert bottom wedge surfaces (36a, 36b), concavely converging in a direction from the outer pair of insert bottom wedge surfaces (36a, 36b), and defining an inner bottom angle Ib;
- the outer and inner top angles Ot, It fulfill the condition:
- 160°>Ot>It>100°;
- and
- the outer and inner bottom angles Ob, Ib fulfill the condition:
- 160°>Ob>Ib>100°.
22 more elements
A cutting tool (1, 1′, 1″) comprising:
- a cutting insert (10, 10′) having an insert longitudinal axis (A1), and comprising:
- a front insert surface (20) and an opposing rear insert surface (22);
- a peripheral insert surface (24) extending between the front insert surface (20) and the rear insert surface (22) and about the insert longitudinal axis (A1), the peripheral insert surface (24) comprising:
- a top insert surface (26) and an opposing bottom insert surface (32);
- a first insert side surface (40) connecting the top and bottom insert surfaces (26, 32);
- and
- a second insert side surface (44) opposing the first insert side surface (40) and connecting the top and bottom insert surfaces (26, 32);
- a first cutting edge (50) formed an intersection between the front insert surface (20) and the top insert surface (26);
- the top insert surface (26) having an elongated top groove (28) which comprises:
- an elongated outer pair of insert top wedge surfaces (30a, 30b), concavely converging in a direction from the first and second insert side surfaces (40, 44) towards each other, with an outer top angle Ot defined between the outer pair of insert top wedge surfaces (30a, 30b);
- and
- an elongated inner pair of insert top wedge surfaces (30c, 30d), located between the outer pair of insert top wedge surfaces (30a, 30b) and concavely converging in a direction from the outer pair of insert top wedge surfaces (30a, 30b), with an inner top angle It defined between the inner pair of insert top wedge surfaces (30c, 30d);
- the bottom insert surface (32) having an elongated bottom groove (34) which comprises:
- an elongated outer pair of insert bottom wedge surfaces (36a, 36b), concavely converging in a direction from the first and second insert side surfaces (40, 44), with an outer bottom angle Ob defined between the outer pair of insert bottom wedge surfaces (36a, 36b);
- and
- an elongated inner pair of insert bottom wedge surfaces (36c, 36d), located between the outer pair of insert bottom wedge surfaces (36a, 36b) and concavely converging in a direction from the outer pair of insert bottom wedge surfaces (36a, 36b), with an inner bottom angle Ib defined between the inner pair of insert bottom wedge surfaces (36c, 36d);
- and
- a tool holder (100, 100′, 100″) comprising:
- a pair of opposing first and second holder side surfaces (102, 104), with a holder front surface (106) extending therebetween;
- an insert pocket (110) accommodating the cutting insert (10) and opening out to the first holder side surface (102), the second holder side surface (104) and the holder front surface (106), the insert pocket (110) comprising:
- a pocket top surface (112) and an opposing pocket bottom surface (116), with a pocket rear surface (120) located therebetween;
- the pocket top surface (112) comprising an elongated pair of pocket top wedge surfaces (114a, 114b), convexly converging from the first and second holder side surfaces (102, 104) with a top pocket angle Pt defined between the pair of pocket top wedge surfaces (114a, 114b);
- and
- the pocket bottom surface (116) comprising an elongated pair of pocket bottom wedge surfaces (118a, 118b), convexly converging from the first and second holder side surfaces (102, 104), with a bottom pocket angle Pb defined between the pair of pocket bottom wedge surfaces (118a, 118b);
- wherein:
- the cutting insert (10, 10′) is releasably retained in the tool holder (100, 100′, 100″);
- one pair of the outer and inner pairs of insert top wedge surfaces (30a, 30b, 30c, 30d) abuts the pair of pocket top wedge surfaces (114a, 114b);
- and
- one pair of the outer and inner pairs of insert bottom wedge surfaces (36a, 36b, 36c, 36d) abuts the pair of pocket bottom wedge surfaces (118a, 118b),
- such that, in a cross-section of the cutting tool (1, 1′, 1″) taken in a plane passing through the top and bottom insert surfaces (26, 32) and generally parallel to the front insert surface (20), at both the top and bottom insert surfaces (26, 32), there are only two regions of contact between the cutting insert (10, 10′) and the insert pocket (110).
27 more elements
Dependencies are inferred from the claim text.