Cutting blade and method for producing such a blade

Patent metadata

Field	Value
Publication number	US-11701724-B2
Application number	US-201816616140-A
Country	US
Kind code	B2
Filing date	Apr 20, 2018
Priority date	Apr 21, 2017
Publication date	Jul 18, 2023
Grant date	Jul 18, 2023

Abstract

A cutting blade for a clearing saw includes a plurality of teeth, with at least some of the teeth having a leading edge, a trailing edge, and a point in between the leading and trailing edges. The trailing edge can be hardened to a depth in the range 0.02-1.5 mm, and the leading edge may be left unhardened to provide a cutting blade with increased durability and efficiency, that can still be filed manually to remain sharp.

First claim

The invention claimed is:

1. A cutting blade for a clearing saw, the cutting blade comprising a plurality of teeth, wherein at least some of said teeth comprise a leading edge, a trailing edge, and a point in between the leading edge and the trailing edge, wherein
the trailing edge is inductively hardened to form a hardened surface having a trailing edge depth in a range of 0.02-1.5 mm by an inductive ring head, wherein a hardness of the trailing edge decreases from a surface of the trailing edge to 590 HV at the trailing edge depth, and
the leading edge is not subjected to the inductive hardening except at said point.

2. The cutting blade according to claim 1 , wherein the trailing edge depth is in a range of 0.02-0.5 mm.

3. The cutting blade according to claim 1 , wherein the leading edge is concave and faces a dedicated circumferential direction of rotation of the cutting blade.

4. The cutting blade according to claim 1 , wherein adjacent teeth of the plurality of teeth are separated by intervening cut-outs.

5. The cutting blade according to claim 1 , wherein a tooth of the plurality of teeth comprises a bend that directs the tooth out of a plane of the cutting blade.

6. A method for producing a cutting blade for a clearing saw, the cutting blade comprising a plurality of teeth, the method comprising:
providing at least some of said teeth with a leading edge, a trailing edge, and a point in between the leading edge and the trailing edge,
inductively hardening the trailing edge by an inductive ring head to form a hardened surface having a trailing edge depth in a range of 0.02-1.5 mm, wherein a hardness of the trailing edge decreases from a surface of the trailing edge to 590 HV at the trailing edge depth, and
not subjecting the leading edge to inductive hardening.

7. The method according to claim 6 , wherein the trailing edge is quenched after hardening.

8. The method according to claim 7 , wherein the at least some of said teeth are subsequently tempered.

9. The method according to claim 6 , wherein the trailing edge depth is in a range of 0.02-0.5 mm.

Assignees

• Husqvarna Ab

Inventors

• Hagberg Albin

Classifications

• B28D1/04

  with circular {or cylindrical} saw-blades or saw-discs (B28D1/10 takes precedence) · CPC title

• B23D63/20

  Combined processes for dressing saw teeth, e.g. both hardening and setting · CPC title

• B23D65/00

  Making tools for sawing machines or sawing devices for use in cutting any kind of material · CPC title

• B27B33/08 Primary

  Circular saw blades · CPC title

• B23D61/025 Primary

  Details of saw blade body · CPC title