SAW BAND AND METHOD FOR THE PRODUCTION OF SAME

• US 20080121084A1
• Filed: 11/13/2007
• Published: 05/29/2008
• Est. Priority Date: 11/24/2006
• Status: Active Grant

• Current Assignee: Oerlikon Surface Solutions Ag, PfAffikon (OC Oerlikon Corporation AG)
• Original Assignee: Oerlikon Trading AG (OC Oerlikon Corporation AG)
• Inventors: Vogel, Josef, Peyerl, Gerhard, Balint, Michael
• Granted Patent: US 8,234,961 B2
• Time in Patent Office: Days
• US Class Current: 83/835
• CPC Class Codes: B23D 61/12 Straight saw blades; Strap saw blades
• CPC Class Codes: B23D 65/00 Making tools for sawing machines or sawing devices for use in cutting any kind of material
• CPC Class Codes: Y10T 83/9317 Endless band or belt type
• CPC Class Codes: Y10T 83/9319 Toothed blade or tooth therefor

Abstract

A saw band of steel for a band saw machine with a band back (Br) and with a tooth row attached thereon comprises several teeth (20), wherein the initial tooth form (10) is triangular with a tooth base with tooth width (b) and with the tooth tip (1) with a first tooth height (h1), such that the tooth tip (1) does not project beyond tooth width (b) in the band running direction (L), wherein the lateral side of the triangle located in front in the running direction (L) forms the rake face (2) and the rear lateral side forms the clearance face (3) of the tooth (10, 20). The tooth tip (1) of the triangle is specifically removed [of material] for the development of a rounded-off tooth crest (4) with a reduced second tooth height (h2), wherein at least in the proximity of the tooth crest (4) a hard material coating covers at least partially the cutting face formed of the tooth crest (4), the rake face (2) and the clearance face (3).

Claims

1. Saw band of steel for a band saw machine with a band back (Br) and with a tooth row comprising several teeth (20) attached on said band back, wherein the initial tooth form (10) is triangular with a tooth base with tooth width (b) and with tooth tip (1) with a first tooth height (h1), such that the tooth tip (1) does not project beyond the tooth width (b) in the band running direction (L), wherein the lateral side of the triangle located in front in the running direction (L) forms the rake face (2) and the rear lateral side forms the clearance face (3) of the tooth (10, 20), characterized in that material from the tooth tip (1) of the triangle is removed such that the tooth tip is rounded off and is developed as a rounded-off tooth crest (4) with a reduced second tooth height (h2) which is spaced apart from the base of the triangle with tooth width (b), and that at least in the proximity of the tooth crest (4) a hard material coating covers at least partially the cutting face formed of the tooth crest (4), the chip face (2) and the clearance face (3).

2. Saw band as claimed in claim 1, characterized in that the chip face (2) is inclined with respect to the perpendicular to the base and to the band back (Br) by a rake angle γ

and the latter is in the range from 0°

to 7°

, preferably in the range from 0°

to 3°

.

3. Saw band as claimed in claim 1, characterized in that the clearance face (3) is inclined with respect to the perpendicular to the rake face (2) by a clearance angle α

and the latter is in the range from 0°

to 20°

, preferably in the range from 4°

to 10°

.

4. Saw band as claimed in claim 1, characterized in that the material removal height (X) from the tooth tip (1) of the original triangle to the tooth crest (4) measured along the rake face (2) of the triangle, is in the range from 0.02 to 0.30 mm, preferably in the range from 0.02 to 0.10 mm at an initial tooth height (h1) of the tip (1) of the triangle of 1.00 to 10.00 mm and at a tooth width (b) at the base of the triangle of 1.00 to 10.00 mm.

5. Saw band as claimed in claim 1, characterized in that at least a portion of the length of the original rake face (2) of the triangle, at least in a subsection away from the tooth crest (4) in the direction toward the base, is further inclined by an additional effective rake angle (γ

eff) and this angle is in the range from 0°

to 20°

, preferably in the range from 4°

to 10°

.

6. Saw band as claimed in claim 5, characterized in that the inclined subsection, measured along the rake face (2), forms the canting length (Y) and is in the range from 0.00 to 0.30 mm, preferably in the range from 0.00 to 0.15 mm and extends maximally to the base of the tooth (20).

7. Saw band as claimed in claim 1, characterized in that the rounded-off tooth crest (4) in the uppermost region with the tooth height (h2) includes a first cutting edge radius (R1) which is in the range from 0.02 to 0.30 mm, preferably in the range from 0.03 to 0.15 mm.

8. Saw band as claimed in claim 1, characterized in that in the rear region of the tooth crest (4) toward the clearance face (3) of the triangle a rounding-off is provided with a rear, second radius (R2) in the range from 0.02 to 0.30 mm, preferably in the range from 0.03 to 0.15 mm.

9. Saw band as claimed in claim 1, characterized in that the coating comprises one or several metals of subgroup IV, V or VI of the periodic system of elements or aluminum or silicon.

10. Saw band as claimed in claim 9, characterized in that the coating comprises the nitrides, oxides, carbides, carbonitrides, borides of said metals or mixtures thereof.

11. Sawband as claimed in claim 10, characterized in that the coating comprises TiAlN, AlCrN, metallic or metal-free DLC, TiAlSiN, TiAlCN, WC/C.

12. Saw band as claimed in claim 9, characterized in that the coating is implemented as a multicoat system.

13. Saw band as claimed in claim 12, characterized in that the multicoat system comprises adhesion and transition layers.

14. Saw band as claimed in claim 1, characterized in that the coating has a thickness of less than 4 μ

m, preferably of 0.5 to 3 μ

m, especially preferred of 0.7 to 2 μ

m.

15. Saw band as claimed in claim 1, characterized in that the band back (Br) and the tooth row with the rounded-off teeth (20) is comprised of diverse steel types and the tooth row is comprised of a high-performance high-speed steel, preferably of HSSE.

16. Method for the production of a saw band of steel for a band saw machine as claimed in claim 1 with a band back (Br) and with a tooth row attached thereon comprising several teeth (20), wherein the original tooth form (10) is triangular with a tooth base with tooth width (b) and with the tooth tip (1) with a first tooth height (h1), such that the tooth tip (1) does not project beyond the tooth width (b) in the band running direction (L), wherein the lateral side of the triangle located in front in the running direction (L) forms the rake face (2) and the rear lateral side forms the clearance face (3) of the tooth (10, 20), characterized in that material of the tooth tip (1) of the triangle with the first tooth height (h1) is removed with an abrasive brush method for the purpose of shaping until a rounded-off tooth crest (4) in the desired form is generated with a reduced second tooth height (h2) spaced apart from the base of the triangle with tooth width (b), and that after the mechanical working at least a portion of the cutting face, on tooth crest (4), the rake face (2) and the clearance face (3) is provided with a hard material coating.

17. Method as claimed in claim 16, characterized in that the brush method is carried out with a brush tool (7, 8) in which the brush comprises synthetic material filaments with abrasive granulated materials embedded therein.

18. Method as claimed in claim 17, characterized in that the synthetic material is a PEEK, PMIA or Nylon.

19. Method as claimed in claim 17, characterized in that the synthetic material filaments comprise carbon fibers.

20. Method as claimed in claim 17, characterized in that as abrasive granulated material the synthetic material filaments comprise preferably one of the substances corundum, carborundum, SiC and/or preferably diamond, or combinations thereof.

21. Method as claimed in claim 16, characterized in that the brush method is carried out with rotating plate-form and/or cylinder-form brush tools (7, 8).

22. Method as claimed in claim 16, characterized in that the brush method is carried out sequentially in at least two steps, preferably in at least three steps and that the filament thickness of the brush tools (7, 8) is decreased with each step.

23. Method as claimed in claim 16, characterized in that the brush tools are guided over the teeth (10, 20) of the saw band while rotating in the manner of planets.

24. Method as claimed in claim 16, characterized in that several saw bands are combined in one packet and are worked simultaneously, preferably with a packet size in the range from 10 to 100 saw bands.