Cutting tool and cutting insert therefor
AssigneeIscar, Ltd.
InventorGil Hecht
Life of this patent
Estimating the term…
Abstract
A cutting tool includes one or more cutting portions, each including an insert pocket having a cutting insert releasably retained therein. The cutting insert has a bottom surface, including a plurality of surfaces, engaging a plurality of walls of the insert pocket in a plurality of sloping and non-sloping engagement regions. These engagement means provide secure and stable clamping of the cutting insert, and prevent displacement of the cutting insert during intensive cutting operations, such as high speed milling, e.g., by significantly decreasing the force exerted on the screw that fastens the cutting insert in the insert pocket.
Claims22
A cutting tool, comprising at least one cutting portion, the at least one cutting portion (16) comprising:
- an insert pocket (18) having a cutting insert (20) releasably retained therein, wherein the cutting insert (20) has a top surface (22), a bottom surface (24), and a peripheral surface (26) extending therebetween, the peripheral surface (26) comprising two opposing major sides (28) and two opposing minor sides (30);
- the bottom surface (24) comprises a plurality of engagement surfaces, of which a plurality of operative engagement surfaces engage an attachment surface (32) of the insert pocket (18) in a respective plurality of sloping and non-sloping engagement regions;
- the plurality of operative engagement surfaces comprising:
- first and second spaced apart operative sloping surfaces (34′, 36′), whose respective sloping engagement regions (80, 82) lie in a first plane forming an acute angle (α) with a first median plane (M1) of the cutting insert (20);
- an operative inner sloping surface (38′) whose respective inner sloping engagement region (88) lies in a second plane forming an obtuse angle (β) with the first median plane (M1), the acute and obtuse angles (α, β) being measured in the same direction from the first median plane (M1);
- and
- operative first and second corner surfaces (40′, 42′) whose respective non-sloping corner engagement regions (72, 74) lie in a third plane that is substantially perpendicular to the first median plane (M1) and to a second median plane (M2) of the cutting insert (20), the second median plane (M2) being perpendicular to the first median plane (M1);
- wherein
- the operative first and second sloping surfaces (34′, 36′), and the operative inner sloping surface (38′) are located on a first side of the first median plane (M1), and the operative first and second corner surfaces (40′, 42′) are located on a second side of the first median plane (M1).
A cutting insert (20) having mutually perpendicular first and second median planes (M1, M2) comprising:
- a top surface (22), a bottom surface (24) and a peripheral surface (26) extending therebetween, the peripheral surface (26) comprising two opposing major sides (28) and two opposing minor sides (30), wherein the bottom surface (24) comprises:
- two major recessed surfaces (66) located on opposite sides of the second median plane (M2) of the cutting insert (20);
- two pairs of first and second corner surfaces (40, 42), alternately located at four respective corners of the bottom surface (24);
- two pairs of first and second sloping surfaces (34, 36), each of the sloping surfaces (34, 36) sloping downward and outward, from respective major recessed surfaces (66), to respective corner surfaces (40, 42);
- a central surface (86) located at a generally central area of the bottom surface (24);
- and
- two inner sloping surfaces (38), located at opposite sides of the bottom surface (24) on either side of the first median plane (M1), the inner sloping surfaces (38) sloping upward and outward from opposite sides of the central surface (86) relative to the median plane (M1), towards respective major sides (28);
- wherein:
- the two pairs of first and second corner surfaces (40, 42), the two pairs of first and second sloping surfaces (34, 36) and the two inner sloping surfaces (38) together constitute two sets of cooperating engagement surfaces, each set including both sloping and non-sloping engagement regions for seating of the insert;
- and
- the sloping engagement regions of a given set are on a first side of the first median plane (M1) and the non-sloping engagement regions of that same set are on a second side of the first median plane (M1).
Dependencies are inferred from the claim text.