Saw blade including teeth having a cutting portion with a wearing protection layer

Abstract

A saw blade (15) includes a body (16) and a plurality of teeth (1). The teeth (1) include a cutting portion (2) of a geometrically defined shape and including a cutting edge (3). The cutting portion (2) includes a wearing protection layer (7) which covers the cutting edge (3). The cutting edge (3) has an edge radius (4) between approximately 0.005 mm and 0.045 mm relating to a condition of the cutting portion (2) without the wearing protection layer (7). Preferably, the wearing protection layer (7) is made of a hard material, especially TiN, TiCN, TiAlN, CrN or DLC.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present invention. In the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a general plan view of a section of a first exemplary embodiment of the novel saw blade being designed as a saw band.

FIG. 2 is a general plan view of a section of a second exemplary embodiment of the novel saw blade being designed as a saw band including carbide inserts.

FIG. 3 is a view of a third exemplary embodiment of the novel saw blade being designed as a circular saw blade.

FIG. 4 is a strongly enlarged view of the tip of a tooth of the novel saw blade during sawing.

FIG. 5 is a further enlarged view of the tip of a partly worn-out tooth during sawing.

FIG. 6 is a diagram illustrating the cutting force and the bonding properties of a wearing protection layer on the Y-axis and the edge radius on the X-axis.

FIG. 7 shows a microscopic recording of the tip of a tooth of the novel saw blade, the tooth including a wearing protection coating.

Claims

1. A saw blade, comprising, a body; anda plurality of teeth, said teeth including a cutting portion of a geometrically defined shape,said cutting portion including a cutting edge,said cutting portion including a wearing protection layer, said wearing protection layer being designed and arranged to cover said cutting edge,said cutting edge having an edge radius between approximately 0.005 mm and 0.045 mm relating to a condition of said cutting portion without said wearing protection layer.

2. The saw blade of claim 1, wherein said edge radius is approximately between 0.010 mm and 0.025 mm.

3. The saw blade of claim 1, wherein said body and said teeth are made of hard metal and said wearing protection layer includes hard material.

4. The saw blade of claim 2, wherein said body and said teeth are made of hard metal and said wearing protection layer includes hard material.

5. The saw blade of claim 1, wherein said teeth include carbide inserts and said wearing protection layer is made of hard material.

6. The saw blade of claim 2, wherein said teeth include carbide inserts and said wearing protection layer is made of hard material.

7. The saw blade of claim 1, wherein said wearing protection layer has a thickness of approximately between 0.002 mm and 0.008 mm.

8. The saw blade of claim 2, wherein said wearing protection layer has a thickness of approximately between 0.002 mm and 0.008 mm.

9. The saw blade of claim 3, wherein said wearing protection layer has a thickness of approximately between 0.002 mm and 0.008 mm.

10. The saw blade of claim 4, wherein said wearing protection layer has a thickness of approximately between 0.002 mm and 0.008 mm.

11. The saw blade of claim 1, wherein said wearing protection layer includes an intermediate layer and a surface layer, said intermediate layer being designed and arranged for providing a fix connection with said cutting portion, said surface layer being designed and arranged for providing hardness and wearing resistance.

12. The saw blade of claim 2, wherein said wearing protection layer includes an intermediate layer and a surface layer, said intermediate layer being designed and arranged for providing a fix connection with said cutting portion, said surface layer being designed and arranged for providing hardness and wearing resistance.

13. The saw blade of claim 11, wherein said intermediate layer includes a material selected from the group consisting of TiN, TiCN, TiAlN and CrN and said surface layer includes DLC.

14. The saw blade of claim 12, wherein said intermediate layer includes a material selected from the group consisting of TiN, TiCN, TiAlN and CrN and said surface layer includes DLC.

15. The saw blade of claim 13, wherein said intermediate layer has a thickness of approximately between 0.002 mm and 0.004 mm.

16. The saw blade of claim 13, wherein said surface layer has a thickness of approximately between 0.002 mm and 0.004 mm.

17. The saw blade of claim 13, wherein said intermediate layer has a thickness of approximately between 0.002 mm and 0.004 mm and said surface layer has a thickness of approximately between 0.002 mm and 0.004 mm.

18. The saw blade of claim 1, wherein said edge radius is determined in response to a point of intersection of a course of the bonding properties of said wearing protection layer on said cutting portion and a course of the cutting force.

19. The saw blade of claim 2, wherein said edge radius is determined in response to a point of intersection of a course of the bonding properties of said wearing protection layer on said cutting portion and a course of the cutting force.

20. A method of producing a saw blade including a body and a plurality of teeth, said method comprising the steps of: grinding a tooth for producing a cutting portion of a geometrically defined shape and including a cutting edge;finishing said cutting portion in a way that said cutting edge has an edge radius between approximately 0.005 mm and 0.045 mm; andapplying a wearing protection layer on said cutting portion in a way that said wearing protection layer covers said cutting edge.

21. The method of claim 20, wherein said edge radius is approximately between 0.010 mm and 0.025 mm.

22. The method of claim 20, wherein said step of finishing is realized by a method selected from the group consisting of brushing, abrasive-blasting and trimming.

23. The method of claim 21, wherein said step of finishing is realized by a method selected from the group consisting of brushing, abrasive-blasting and trimming.