Saw blade and method for its production

• US 6,158,324 A
• Filed: 09/03/1998
• Issued: 12/12/2000
• Est. Priority Date: 09/08/1997
• Status: Expired due to Term

• Current Assignee: Wikus-Saegenfabrik Wilhelm H. Kullmann GmbH & Co. Kg
• Original Assignee: Wikus-Saegenfabrik Wilhelm H. Kullmann GmbH & Co. Kg
• Inventors: Kullmann, Jorg H., Fluhrer, Manfred
• Primary Examiner(s): Young, Lee
• Assistant Examiner(s): SMITH, SEAN PRENTISS
• Application Number:
  US09/146,894
• Time in Patent Office: 831 Days
• Field of Search: 83/835, 83/837, 83/839, 83/854, 83/855, 408/206, 408/207, 408/224
• US Class Current: 83/848
• CPC Class Codes: B23D 61/021 Types of set; Variable teeth, e.g. variable in height or gullet depth: Varying pitch; Details of gullet
• CPC Class Codes: Y10T 408/8957 and having stepped cutting edges
• CPC Class Codes: Y10T 83/935 Plural tooth groups
• CPC Class Codes: Y10T 83/9355 Including intermediate raker tooth
• CPC Class Codes: Y10T 83/9358 Series of dissimilar teeth

Abstract

A saw blade comprising a basic body (8) lying in a longitudinal center plane (9) and having an edge and including along its edge a group (6) of recurring teeth (1, 2, 3, . . . ), the group (6) comprising at least one unset leading tooth (1) being provided with a phase and having an effective cutting-edge section (10) and a preferably even number of trailing teeth (2, 3, . . . ). The leading tooth (1) has a larger height than all of the trailing teeth (2, 3, . . . ). All of the trailing teeth (2, 3, . . . ) have different plastic deformations at their tips (28) by displacements of material in the running direction (24) of the saw blade. Each of the trailing teeth (2, 3, . . . ) have both a positive enlarged rake angle (gamma₂, gamma₃, . . . ) and a reduced height (h₂, h₃, . . . ) with respect to the leading tooth (1) produced by different plastic deformations.

Claims

1. A saw blade, comprising:

a basic body (8) being arranged in a longitudinal center plane (9), having an edge and including along its edge a (group (6) of recurring teeth (1, 2, 3, . . . );

said group (6) including at least one unset leading tooth (1) having a phase, an effective cutting-edge section (10) and a number of set trailing teeth (2, 3, . . . );

said leading tooth (1) having a larger height than all of said trailing teeth (2 3, . . . );

all of said trailing teeth (2, 3, . . . ) each having a different plastic deformation at their tips (28) by displacements of material in the running direction (24) of said saw blade within the longitudinal center plane (9);

each of said trailing teeth (2, 3, . . . ) having both a positive enlarged rake angle (gamma₂, gamma₃, . . . ) and a reduced height (h₂, h₃, . . . ) with respect to said leading tooth (1) being effected by said different plastic deformations.

2. The saw blade of claim 1, wherein said at least one leading tooth (1) includes a plastic deformation at its tip (28), said plastic deformation being different from said plastic deformations of said trailing teeth (2, 3, . . . ), said leading tooth (1) having both a positive enlarged rake angle (gamma₁) and a reduced height (h1) being larger than the reduced heights of each of said trailing teeth (2, 3, . . . ).

3. The saw blade of claim 2, wherein said at least one leading tooth (1) has the positive enlarged rake angle (gamma₁) at its tip (28) in a range between about 5°

and 25° and

said trailing teeth (2, 3, . . . ) have positive enlarged rake angles (gamma₂, gamma₃, . . . ) in a range between about 5° and

30°

.

4. The saw blade of claim 1, wherein a height difference (Δ

h) exists between the height (h₁) of said leading tooth (1) and the height (h₂) of said trailing tooth (2) in a range of about 0.05 mm to 0.30 mm.

5. The saw blade of claim 1, wherein said set trailing teeth (2, 3, . . . ) are swaged differently to be positioned on different height levels, the different height levels being arranged in steps, the steps combining decreasing height with increasing rake angles (gamma₂, gamma₃, . . . ) and increasing setting width.

6. The saw blade of claim 1, wherein the phase angle (16) of said leading tooth (1) and the setting widths (18) of said trailing teeth (2, 3, . . . ) are coordinated with each other in a manner such that the load and the stresses of said saw blade is distributed substantially equally to all of said teeth (1, 2, 3, . . . ).

7. The saw blade of claim 2, wherein said at least one leading tooth (1) has a positive enlarged rake angle (gamma₁) at its tip (28) of approximately 15°

, and said trailing teeth (2, 3, . . . ) have positive enlarged rake angles (gamma₂, gamma₃, . . . ) in a range of approximately 17°

to 21°

.

8. The saw blade of claim 1, wherein a height difference (α

h) exists between the height (h₁) of said leading tooth (1) and the height (h₂) of said trailing tooth (2) in a range between 0.08 mm and 0.15 mm.

9. The saw blade of claim 1, wherein said set trailing teeth (2, 3, . . . ) are swaged differently pair for pair to be positioned on different height levels, the different height levels being arranged in steps, the steps combining decreasing height with increasing rake angles (gamma₂, gamma₃, . . . ) and increasing setting width.

10. The saw blade of claim 1, wherein all of said teeth are made of raw teeth (19, 20) having the same raw height (H) and the same raw rake angle (gamma_R), said raw teeth (20) being designed to form said trailing teeth (2, 3, . . . ) by being plastically defomed to a larger extent than said leading tooth (1).

11. The saw blade of claim 1, wherein all of said teeth are made of raw teeth (19, 20) having different heights (H₁, H₂, H₃), said tips (28) of said leading tooth (1) and of said trailing teeth (2, 3, . . . ) being plastically deformed in a manner such that said leading tooth (1) and each of said trailing teeth (2, 3, . . . ) in said group (6) has both an enlarged positive rake angle (gamma₁, gamma₂, gamma₃, . . . ) and a reduced height (h₂, h₃, . . . ) with respect to the height of said leading tooth (1).

12. The saw blade of claim 1, wherein the number of trailing teeth (2, 3, . .) is even.