CIRCULAR SAW BLADE

Abstract

A carbide or cermet tip for an industrial circular saw blade is provided with improved geometric features that provide enhanced performance and longer life for the saw blade. The features include a bottom mounting surface opposite a flank relief surface, a back mounting surface opposite a leading face surface, each surface bounded by a first side surface and a second side surface; and a chip splitting groove formed on a flank relief of the tip. The ratio of the width of the chip splitting groove to the width of the tip, the width of the chip splitting groove, and the ratio of the depth of the chip splitting groove to the width of the tip are optimized. The tip is adapted to prevent contact of the chip with a gullet area of the circular steel saw body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described in further detail with reference to the accompanying drawings, in which:

FIG. 1 is a side view of a saw blade in accordance with an embodiment of the present invention;

FIG. 2 is a perspective view of a tip used in the saw blade of FIG. 1;

FIG. 3 a partial front face view of a tip mounted on a saw blade body showing the groove width to tip width ratio and the groove depth to tip width ratio;

FIG. 4 is a diagram showing the cross-section of the chips that will be removed from a work piece, also shown in cross-section, by a tip shown in a front view;

FIG. 5 is a picture of a front perspective view of an actual tip of the present invention showing the increased wear caused by chip splitting grooves;

FIG. 6 is a side view of a tip used in the saw blade of FIG. 1;

FIG. 7 is a partial side view of a the saw blade of FIG. 1 wherein the chip formed by the tip is curled and fills the gullet without contacting the saw blade;

FIG. 8 is partial side view of a prior art saw blade wherein the chip formed by the tip contacts the gullet of the saw blade;

FIG. 9 is a partial front face view of a tip mounted on a saw blade body showing top to bottom relief;

FIG. 10 is a partial top view of a tip mounted on a saw blade body showing front to back relief; and

FIG. 11 shows actual test results from testing of saw blades in accordance with the present invention and prior art saw blades.

Claims

1. A circular saw blade comprising: a generally circular, steel saw body; anda plurality of carbide or cermet tips spaced about the outer periphery of the circular saw body and attached to the saw body, wherein each tip has a chip splitting groove formed on a flank relief of the tip, wherein the ratio of the width of the chip splitting groove to the width of the tip is generally 1:7 or less and the width of the chip splitting groove is 0.014 inches or less.

2. The circular saw blade of claim 1, wherein the ratio of the depth of the chip splitting groove to the width of the tip is generally 1:17 or less.

3. The circular saw blade of claim 1, wherein the ratio of the height of the tip to the width of the tip is between 1.20 to 1.30.

4. The circular saw blade of claim 1, wherein the tip is adapted to prevent contact of the chip with a gullet area of the circular steel saw body.

5. The circular saw blade of claim 1, wherein the tip has a side relief angle of greater that one degree from top to bottom.

6. The circular saw blade of claim 5, wherein the tip has a side relief angle of greater that zero degree from front to back.

7. The circular saw blade of claim 4, wherein the plurality of tips each having a leading face opposite a back mounting face, wherein the leading face of each tip comprises, from top to bottom: a rake surface formed at negative rake angle,a first planar surface extending from a bottom of the rake surface toward the back mounting face of the tip at a first angle,a second planar surface extending from the bottom of the first planar surface at an second angle away from the back mounting face of the tip and forming an angle greater than ninety degrees and less than one hundred eighty degrees with the first clearance surface,a third planar surface generally parallel to the back mounting face of the tip,each tip further comprising a concave radius between the first planar surface and the second planar surface, and a convex radius between the second planar surface and the third planar surface.

8. A tip for a circular saw blade, the tip comprising: a bottom mounting surface opposite a flank relief surface, a back mounting surface opposite a leading face surface, each surface bounded by a first side surface and a second side surface;a chip splitting groove formed on a flank relief of the tip, wherein the ratio of the width of the chip splitting groove to the width of the tip is generally 1:7 or less and the width of the chip splitting groove is 0.014 inches or less.

9. The tip of claim 8, wherein the ratio of the depth of the chip splitting groove to the width of the tip is generally 1:17 or less.

10. A circular saw blade comprising: a generally circular steel saw body; anda plurality of carbide or cermet tips each having a leading face opposite a back mounting face, wherein the leading face of each tip comprises, from top to bottom: a planar rake surface formed at negative rake angle,a second planar surface extending from a bottom of the rake surface toward the back mounting face of the tip at a first angle,a third planar surface extending from the bottom of the second planar surface at an second angle away from the back mounting face of the tip and forming an angle greater than ninety degrees and less than one hundred eighty degrees with the second planar surface,a fourth planar surface generally parallel to the back mounting face of the tip,each tip further comprising a concave radius between the second planar surface and the third planar surface, and a convex radius between the third planar surface and the fourth planar surface;wherein each tip is adapted to prevent contact of a chip from a work piece with a gullet area of the circular steel saw body.

11. The circular saw blade of claim 10, wherein the second planar surface is at an angle generally between 3 and 10 degrees with the back mounting surface.

12. The circular saw blade of claim 10, wherein the third planar surface is at an angle generally between 15 and 35 degrees with the back mounting surface.

13. The circular saw blade of claim 10, wherein at least one of the radii is between 0.020 inch and 0.060 inch.

14. A circular saw blade comprising: a generally circular, steel saw body; anda plurality of carbide or cermet tips spaced about the outer periphery of the circular saw body and attached to the saw body, wherein each tip has a chip splitting groove formed on a flank relief of the tip, wherein the ratio of the depth of the chip splitting groove to the width of the tip is generally 1:17 or less.

15. The circular saw blade of claim 14, wherein the tip is adapted to prevent contact of the chip with a gullet area of the circular steel saw body.

16. The circular saw blade of claim 15, wherein the plurality of tips each having a leading face opposite a back mounting face, wherein the leading face of each tip comprises, from top to bottom: a rake surface formed at negative rake angle,a first planar surface extending from a bottom of the rake surface toward the back mounting face of the tip at a first angle,a second planar surface extending from the bottom of the first planar surface at an second angle away from the back mounting face of the tip and forming an angle greater than ninety degrees and less than one hundred eighty degrees with the first clearance surface,a third planar surface generally parallel to the back mounting face of the tip,each tip further comprising a concave radius between the first planar surface and the second planar surface, and a convex radius between the second planar surface and the third planar surface.

17. A tip for a circular saw, the tip comprising: a bottom mounting surface opposite a flank relief surface, a back mounting surface opposite a leading face surface, each surface bounded by a first side surface and a second side surface;a chip splitting groove formed on a flank relief of the tip, wherein the ratio of the depth of the chip splitting groove to the width of the tip is generally 1:17 or less.

18. The tip of claim 17, wherein the ratio of the width of the chip splitting groove to the width of the tip is generally 1:7 or less.

19. The tip of claim 17, wherein the width of the chip splitting groove is 0.014 inches or less.

20. The tip of claim 17, wherein the leading face comprises, from top to bottom: a planar rake surface formed at negative rake angle,a second planar surface extending from a bottom of the rake surface toward the back mounting face of the tip at a first angle,a third planar surface extending from the bottom of the second planar surface at an second angle away from the back mounting face of the tip and forming an angle greater than ninety degrees and less than one hundred eighty degrees with the second planar surface,a fourth planar surface generally parallel to the back mounting face of the tip,the tip further comprising a concave radius between the second planar surface and the third planar surface, and a convex radius between the third planar surface and the fourth planar surface.