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1. US5921722 - Polygonal cutting insert

Anmerkung: Text basiert auf automatischer optischer Zeichenerkennung (OCR). Verwenden Sie bitte aus rechtlichen Gründen die PDF-Version.

[ EN ]
We claim:
1. A cutting insert comprising:
a polygonal cutting insert body formed with at least one cutting corner, a top side, and a front side adjoining said corner and forming a cutting edge with said top side; and
at least one cutting element in the form of an elongated rib formed on said top side of said body and having a longitudinal axis extending substantially in a chip-removal direction, said rib having a front end spaced from said cutting edge and a cross section increasing from said front end to a region at which said cross section is a maximum and decreasing from said maximum to a rear end of said rib, said rib having:
an ascending front flank rising from said front end and widening toward a greatest width as said region,
a descending upper surface directly adjoining said ascending front flank at said region and narrowing away therefrom to said rear end, and
a height of said region such that said region lies above said cutting edge.
2. The cutting insert defined in claim 1 wherein said longitudinal axis includes an angle (α 4) between 30° and 150° with said cutting edge.
3. The cutting insert defined in claim 1 wherein said rib has a pair of lateral flanks adjoining said upper surface at respective lateral edges of said upper surface, said lateral edges being inclined to said longitudinal axis at angles (α 1, α 2) between 3° to 20°.
4. The cutting insert defined in claim 1 wherein said ascending front flank has an initial width at said front end between 0.0 mm and 0.5 mm and increases to said greatest width which is between 0.3 mm to 1.5 mm and 2 to 4 times said initial width.
5. The cutting insert defined in claim 1 wherein said front end of rib is spaced between 0.03 mm and 1 mm from the cutting edge.
6. The cutting insert defined in claim 1 wherein said rib has a length between 1.0 mm and 8.0 mm and said ascending front flank has a length between 0.3 mm and 1.5 mm.
7. The cutting insert defined in claim 1 wherein said ascending front flank is flat and has an angle with said top side adjacent said cutting edge range between 10° and 45°.
8. The cutting insert defined in claim 1 wherein said ascending front flank is curved and a tangent to said ascending front flank includes an angle with said top side adjacent said cutting edge between 10° and 45°.
9. The cutting insert defined in claim 1 wherein said longitudinal rib is convex in said region with a radius (R 1) between 0.1 mm and 1 mm.
10. The cutting insert defined in claim 1 wherein said upper surface is curved.
11. The cutting insert defined in claim 1 wherein a plurality of said cutting elements are formed to each side of said corner at a spacing between said ribs measured at said region between 1.5 and 5 times the width at said greatest width of said ribs.
12. The cutting insert defined in claim 1 wherein said elongated rib has lateral flanks adjoining said ascending front flank and said upper surface with angles of inclination ranging between 15° and 45° relative to respective base lines.
13. The cutting insert defined in claim 1 wherein said ascending front flank and said upper surface lie parallel to said cutting edge transversely of said axis.
14. The cutting insert defined in claim 1 wherein said ascending slope and said upper surface include angles of up to 15° transversely of said rib relative to a line parallel to said cutting edge.
15. The cutting insert defined in claim 1, further comprising a chamfer on said body at said cutting edge, said rib extending into said chamfer.
16. The cutting insert defined in claim 1 wherein said region lies above said cutting edge by a height between 0.05 and 0.5 mm.
17. The cutting insert defined in claim 1 wherein a plurality of said cutting elements are provided on each side of said corner and the elongated ribs of said elements vary from one another with respect to angular orientation, shape and height.
18. The cutting insert defined in claim 1 wherein said front side is perpendicular to said top side.
19. The cutting insert defined in claim 1 wherein said front side forms a positive angle with said top side.
20. The cutting insert defined in claim 1 wherein said cutting edge is a straight edge.
21. The cutting insert defined in claim 1, further comprising additional raised cutting elements on said top side.
22. The cutting insert defined in claim 1 wherein said top side is formed with a recess extending to said cutting edge.
23. A cutting insert comprising:
a polygonal cutting insert body formed with at least one cutting corner, a top side, and a front side adjoining said corner and forming a cutting edge with said top side; and
at least one cutting element in the form of an elongated rib formed on said top side of said body and having a longitudinal axis extending substantially in a chip-removal direction, said rib having a front end spaced from said cutting edge and a cross section increasing from said front end to a region at which said cross section is a maximum and decreasing from said maximum to a rear end of said rib, said rib having:
an ascending front flank rising from said front end and widening toward a greatest width as said region,
a descending upper surface directly adjoining at said region and narrowing away therefrom to said rear end,
a height of said region such that said region lies above said cutting edge, and
said upper surface includes an angle (β 2) with said top side adjacent said cutting edge between 5° and 40°.
24. The cutting insert defined in claim 23 wherein said longitudinal axis includes an angle (α 4) between 60° and 120° with said cutting edge, said rib is formed with lateral flanks adjoining said upper surface in respective lateral edges, said lateral edges including angles (α 1, α 2) between 5° and 15°, said ascending front flank having an initial width (β1) at said front end between 0.2 mm and 0.3 mm, said greatest width being 2 to 4 times said initial width, said front end being spaced 0.05 mm to 0.3 mm from said cutting edge, said rib having a length (α 2) between 1.4 mm and 4 mm, said ascending front flank having a length (α 3) between 0.4 mm and 0.8 mm, said ascending front flank forming an angle with said top side adjacent said cutting edge between 20° and 30°, said angle (β 2) included between said upper surface and said top side being 5° to 15°, said region projecting above said cutting edge by 0.1 mm to 0.3 mm.