CA2662894A1 - Hardened saw tooth for circular saw - Google Patents
Hardened saw tooth for circular saw Download PDFInfo
- Publication number
- CA2662894A1 CA2662894A1 CA 2662894 CA2662894A CA2662894A1 CA 2662894 A1 CA2662894 A1 CA 2662894A1 CA 2662894 CA2662894 CA 2662894 CA 2662894 A CA2662894 A CA 2662894A CA 2662894 A1 CA2662894 A1 CA 2662894A1
- Authority
- CA
- Canada
- Prior art keywords
- tooth
- saw
- hardened
- cutting
- teeth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000006698 induction Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims 4
- 229910000831 Steel Inorganic materials 0.000 description 18
- 239000010959 steel Substances 0.000 description 18
- 229910000760 Hardened steel Inorganic materials 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- YXOLAZRVSSWPPT-UHFFFAOYSA-N Morin Chemical compound OC1=CC(O)=CC=C1C1=C(O)C(=O)C2=C(O)C=C(O)C=C2O1 YXOLAZRVSSWPPT-UHFFFAOYSA-N 0.000 description 2
- UXOUKMQIEVGVLY-UHFFFAOYSA-N morin Natural products OC1=CC(O)=CC(C2=C(C(=O)C3=C(O)C=C(O)C=C3O2)O)=C1 UXOUKMQIEVGVLY-UHFFFAOYSA-N 0.000 description 2
- 235000007708 morin Nutrition 0.000 description 2
- 238000005219 brazing Methods 0.000 description 1
- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
- 238000005552 hardfacing Methods 0.000 description 1
- 230000012447 hatching Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
- B23D61/02—Circular saw blades
- B23D61/04—Circular saw blades with inserted saw teeth, i.e. the teeth being individually inserted
- B23D61/06—Circular saw blades with inserted saw teeth, i.e. the teeth being individually inserted in exchangeable arrangement
- B23D61/065—Adjustable teeth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Harvester Elements (AREA)
Description
q/M/J,..,......,. Y/M/D
Induetry Induetrie Canada Canada 2009/04/24 II~~I~III~I~III~I~I~~I~I~~I II N
24 Apri12009 C,PO OP,C 17330071 APPLICATION FOR
CANADIAN PATENT
INVENTOR: Duane Anthony Barlow, Burford Ontario, Canada TITLE: HARDENED SAW TOOTH FOR CIRCULAR SAW
TO ALL WHOM IT MAY CONCERN:
BE IT KNOWN THAT I, Maurice Micacchi 4 Vimy Place Woodstock, Ontario Tel: 519-532-3283 Fax: 888-763-2336 am the owner of the invention herein disclosed for a HARDENED SAW TOOTH FOR CIRCULAR SAW
I request the grant of a patent for this invention which is described and claimed in the accompanying specification. The applicant is entitled to apply for and be granted a patent by virtue of consent from Duane Anthony Barlow, Burford Ontario, Canada in favour of Maurice Micacchi, 4 Vimy Place, Woodstock, Ontario, Canada, dated 23 Apri12009.
I also request that the patent application be laid open as soon as possible.
The applicant believes that in accordance with subsection 3.01(2) of the Patent Rules, the applicant is entitled to pay the fees at the small entity level in respect of this application.
SIGN+tTt}RE
Maurice Page 1 of 11 Hardened Saw Tooth for Circular Saw Field of the Invention The present invention relates to saw teeth for circular saws.
Background of the Invention Saw teeth for circular saws of the type mounted on a feller head for a tree felling apparatus are known. U.S. Pat. No. 4,932,447, Morin, 1990, and U.S. Pat. No.
5,205,199, MacLennan, 1993, represent saw teeth which have become well known in the industry.
Morin '447 and MacLennan '199 both teach a replaceable saw tooth with four sides.
Saw teeth wear relatively quickly and may become rounded or dull. This may cause increased fuel consumption, decreased productivity, or poor cut quality, or all of them, and may tend to require maintenance. The cutting tips do the majority of the cutting of the tree fibers and even though the teeth may have large cutting tips, only a small area at the end of the tip is used. As the tip wears it may tend to become rounded and the trailing part of the tooth immediately behind the end of the tip contacts the tree as well as the leading point. This may tend to result in increased friction and the tearing of tree fibers, instead of cutting the tree fibers with a shearing action. This may tend to consume more energy, decrease machine productivity and produce a rougher cut on the tree butt. A dull tooth may impose higher forces and stresses on the saw blade than a sharp tooth.
Saw teeth can generally be divided into two categories: carbide and non-carbide. Carbide teeth have at least one wear-resistant insert, usually of tungsten carbide and usually installed by brazing, for use in abrasive conditions where contact with rocks is an unlikely occurrence. The advantage of carbide teeth is that they are abrasion resistant and thereby last longer than steel teeth. The two disadvantages of carbide teeth is their high cost and their lack of impact resistance thereby are usually severely damaged by even minor impact.
In conditions where rock contact is a regular occurrence, teeth with hardened steel cutting edges are common because of the ability of these teeth to deform where a carbide insert might shatter. Even a damaged steel tooth cuts better than a carbide tooth when one of its inserts has been shattered.
Carbide teeth are much more expensive than steel teeth but tend to be damaged easily due to impact with rock or debris.
The advantages of prior art steel teeth is that they are inexpensive and are impact resistant and thereby last longer than carbide teeth in impact conditions. The disadvantage of prior art steel teeth is their limited abrasion resistance thereby do not last long in abrasive conditions.
Page 2 of 11 In conditions where rock contact is a regular occurrence, teeth with hardened steel cutting edges are common because of the ability of these teeth to deform where a carbide insert might shatter.
Current prior art steel teeth are either through hardened or case hardened.
Current prior art through hardened steel teeth are subject to fracture due to their hardened structure from the surface through the entire body. They also wear evenly causing a round cutting tip which contacts the tree as well as the leading point which causes increased friction between the trailing part of the tooth and the tree and loss of energy of the saw blade. This increased friction causes inefficient cutting of the tree and results in decreased productivity and higher fuel consumption. When a tooth is new with a sharp cutting tip the tooth cuts the tree fibers and creates a clear path which the trailing part of the tooth follows without not making contact with the tree and causing minimal friction and loss of energy of the saw blade.
Current prior art case hardened steel teeth are heat treated to have a hardened skin on the complete tooth body which wears in a rounded manner similar to Figure 1 causing increased friction and loss of energy of the saw blade hardened.
Brief Description of the Drawinas Figure 1 is a cross section of a saw blade and partially worn prior art steel saw tooth cutting though a vertical standing tree.
Figure 2 is a cross section of a saw blade and new prior art steel saw tooth cutting though a vertical standing tree.
Figure 3 is a perspective view of saw tooth according to an aspect of the present invention.
Figure 4 is a perspective view of an alternate embodiment saw tooth to that of Figure 3.
Figure 5 is a cross section of a saw blade and partially worn saw tooth according to an aspect of the present invention cutting though a vertical standing tree.
Figure 6 is a cross section of a saw blade and tooth according to an aspect of the present invention that is worn more than saw the tooth of Figure 5 cutting though a vertical standing tree.
Description of the Invention This invention will provide a steel saw tooth with improved abrasion resistance and longer life than prior art steel teeth while providing better impact resistance than prior art carbide teeth.
In an aspect of the invention, there is a tooth assembly for releasable mounting to a circular saw disc. The tooth has a body with a mounting end and a front end distant from the mounting end; at least one cutting tip mounted at the front end.
The tooth may be a tooth for a feller buncher saw for cutting timber. In a feature of that aspect of the invention, at least one of the cutting tips has a hardened face that is Page 3 of 11 significantly harder than the rest of the tooth body. This hardened cutting face can be achieved by induction hardening or other method that creates a significantly harder surface than the body behind it. Other processes such as flame hardening or oxyacetylene applied hardfacing, but not limited to can also be used to achieve the hardened face.
Current prior art through hardened steel teeth 1 are subject to fracture due to their hardened structure from the surface through the entire body. They also wear evenly causing a round cutting tip 2 to contact the tree as well as the leading point 23 which causes increased friction between the trailing part of the tooth 3 and the tree 4 and loss of energy of the saw blade 5 as shown is Figure 1. This increased friction causes inefficient cutting of the tree and results in decreased productivity and higher fuel consumption.
Figure 2 shows a new steel tooth 6 with a sharp cutting tip 7 cutting the tree 4 and creates a clear path which the trailing part of the tooth 8 follows without not making contact with the tree 4 and causing minimal friction and loss of energy of the saw blade 5.
Figure 3 shows the invention : a steel tooth 9 with the front faces 10 of the cutting tips 11 induction hardened significantly harder than the body 12 behind the front face of the cutting tips 11. The induction hardened region 13 is shown with cross hatching. The invention is made by induction hardening the front faces 10 of the cutting tips 11 of a steel saw tooth to create a hard face similar to a carbide insert, with a softer, tougher core or body 12---bel~d~the hard-face ~Intiucticm-h~.rdeningzs aprocess weil known and established in industry. The hard face will resist abrasion while the softer, tougher core or body will absorb impact. This process of hardening only the front face of the cutting tip of the saw tooth will result in a saw tooth with improved wear properties compared to prior art steel saw teeth and lower cost and better impact properties than prior art carbide teeth.
Figure 4 shows another configuration of the invention: a steel tooth 14 with the edges 15 of the front faces 16 (as opposed to the complete front faces as shown on Figure 3) of the cutting tips 17 induction hardened significantly harder than the body 18 behind the front face of the cutting tips.
Figure 5 shows the invention steel tooth 19 after some use where the cutting tip 20 becomes rounded over a relatively small area compared to the prior art tooth shown in Figure 1 thereby eliminating the large rounded tips that are typical of current steel teeth.
Figure 6 shows the invention steel tooth 19 after more use than in Figure 5, showing how the trailing part of the tooth 21 wears more behind the hardened cutting face 22 of the cutting tip 24 since it is softer than the cutting tip face, thereby self sharpening the cutting tip due to this wear pattern. This self sharpening feature will prolong the cutting efficiency and increase the life of the tooth.
Induetry Induetrie Canada Canada 2009/04/24 II~~I~III~I~III~I~I~~I~I~~I II N
24 Apri12009 C,PO OP,C 17330071 APPLICATION FOR
CANADIAN PATENT
INVENTOR: Duane Anthony Barlow, Burford Ontario, Canada TITLE: HARDENED SAW TOOTH FOR CIRCULAR SAW
TO ALL WHOM IT MAY CONCERN:
BE IT KNOWN THAT I, Maurice Micacchi 4 Vimy Place Woodstock, Ontario Tel: 519-532-3283 Fax: 888-763-2336 am the owner of the invention herein disclosed for a HARDENED SAW TOOTH FOR CIRCULAR SAW
I request the grant of a patent for this invention which is described and claimed in the accompanying specification. The applicant is entitled to apply for and be granted a patent by virtue of consent from Duane Anthony Barlow, Burford Ontario, Canada in favour of Maurice Micacchi, 4 Vimy Place, Woodstock, Ontario, Canada, dated 23 Apri12009.
I also request that the patent application be laid open as soon as possible.
The applicant believes that in accordance with subsection 3.01(2) of the Patent Rules, the applicant is entitled to pay the fees at the small entity level in respect of this application.
SIGN+tTt}RE
Maurice Page 1 of 11 Hardened Saw Tooth for Circular Saw Field of the Invention The present invention relates to saw teeth for circular saws.
Background of the Invention Saw teeth for circular saws of the type mounted on a feller head for a tree felling apparatus are known. U.S. Pat. No. 4,932,447, Morin, 1990, and U.S. Pat. No.
5,205,199, MacLennan, 1993, represent saw teeth which have become well known in the industry.
Morin '447 and MacLennan '199 both teach a replaceable saw tooth with four sides.
Saw teeth wear relatively quickly and may become rounded or dull. This may cause increased fuel consumption, decreased productivity, or poor cut quality, or all of them, and may tend to require maintenance. The cutting tips do the majority of the cutting of the tree fibers and even though the teeth may have large cutting tips, only a small area at the end of the tip is used. As the tip wears it may tend to become rounded and the trailing part of the tooth immediately behind the end of the tip contacts the tree as well as the leading point. This may tend to result in increased friction and the tearing of tree fibers, instead of cutting the tree fibers with a shearing action. This may tend to consume more energy, decrease machine productivity and produce a rougher cut on the tree butt. A dull tooth may impose higher forces and stresses on the saw blade than a sharp tooth.
Saw teeth can generally be divided into two categories: carbide and non-carbide. Carbide teeth have at least one wear-resistant insert, usually of tungsten carbide and usually installed by brazing, for use in abrasive conditions where contact with rocks is an unlikely occurrence. The advantage of carbide teeth is that they are abrasion resistant and thereby last longer than steel teeth. The two disadvantages of carbide teeth is their high cost and their lack of impact resistance thereby are usually severely damaged by even minor impact.
In conditions where rock contact is a regular occurrence, teeth with hardened steel cutting edges are common because of the ability of these teeth to deform where a carbide insert might shatter. Even a damaged steel tooth cuts better than a carbide tooth when one of its inserts has been shattered.
Carbide teeth are much more expensive than steel teeth but tend to be damaged easily due to impact with rock or debris.
The advantages of prior art steel teeth is that they are inexpensive and are impact resistant and thereby last longer than carbide teeth in impact conditions. The disadvantage of prior art steel teeth is their limited abrasion resistance thereby do not last long in abrasive conditions.
Page 2 of 11 In conditions where rock contact is a regular occurrence, teeth with hardened steel cutting edges are common because of the ability of these teeth to deform where a carbide insert might shatter.
Current prior art steel teeth are either through hardened or case hardened.
Current prior art through hardened steel teeth are subject to fracture due to their hardened structure from the surface through the entire body. They also wear evenly causing a round cutting tip which contacts the tree as well as the leading point which causes increased friction between the trailing part of the tooth and the tree and loss of energy of the saw blade. This increased friction causes inefficient cutting of the tree and results in decreased productivity and higher fuel consumption. When a tooth is new with a sharp cutting tip the tooth cuts the tree fibers and creates a clear path which the trailing part of the tooth follows without not making contact with the tree and causing minimal friction and loss of energy of the saw blade.
Current prior art case hardened steel teeth are heat treated to have a hardened skin on the complete tooth body which wears in a rounded manner similar to Figure 1 causing increased friction and loss of energy of the saw blade hardened.
Brief Description of the Drawinas Figure 1 is a cross section of a saw blade and partially worn prior art steel saw tooth cutting though a vertical standing tree.
Figure 2 is a cross section of a saw blade and new prior art steel saw tooth cutting though a vertical standing tree.
Figure 3 is a perspective view of saw tooth according to an aspect of the present invention.
Figure 4 is a perspective view of an alternate embodiment saw tooth to that of Figure 3.
Figure 5 is a cross section of a saw blade and partially worn saw tooth according to an aspect of the present invention cutting though a vertical standing tree.
Figure 6 is a cross section of a saw blade and tooth according to an aspect of the present invention that is worn more than saw the tooth of Figure 5 cutting though a vertical standing tree.
Description of the Invention This invention will provide a steel saw tooth with improved abrasion resistance and longer life than prior art steel teeth while providing better impact resistance than prior art carbide teeth.
In an aspect of the invention, there is a tooth assembly for releasable mounting to a circular saw disc. The tooth has a body with a mounting end and a front end distant from the mounting end; at least one cutting tip mounted at the front end.
The tooth may be a tooth for a feller buncher saw for cutting timber. In a feature of that aspect of the invention, at least one of the cutting tips has a hardened face that is Page 3 of 11 significantly harder than the rest of the tooth body. This hardened cutting face can be achieved by induction hardening or other method that creates a significantly harder surface than the body behind it. Other processes such as flame hardening or oxyacetylene applied hardfacing, but not limited to can also be used to achieve the hardened face.
Current prior art through hardened steel teeth 1 are subject to fracture due to their hardened structure from the surface through the entire body. They also wear evenly causing a round cutting tip 2 to contact the tree as well as the leading point 23 which causes increased friction between the trailing part of the tooth 3 and the tree 4 and loss of energy of the saw blade 5 as shown is Figure 1. This increased friction causes inefficient cutting of the tree and results in decreased productivity and higher fuel consumption.
Figure 2 shows a new steel tooth 6 with a sharp cutting tip 7 cutting the tree 4 and creates a clear path which the trailing part of the tooth 8 follows without not making contact with the tree 4 and causing minimal friction and loss of energy of the saw blade 5.
Figure 3 shows the invention : a steel tooth 9 with the front faces 10 of the cutting tips 11 induction hardened significantly harder than the body 12 behind the front face of the cutting tips 11. The induction hardened region 13 is shown with cross hatching. The invention is made by induction hardening the front faces 10 of the cutting tips 11 of a steel saw tooth to create a hard face similar to a carbide insert, with a softer, tougher core or body 12---bel~d~the hard-face ~Intiucticm-h~.rdeningzs aprocess weil known and established in industry. The hard face will resist abrasion while the softer, tougher core or body will absorb impact. This process of hardening only the front face of the cutting tip of the saw tooth will result in a saw tooth with improved wear properties compared to prior art steel saw teeth and lower cost and better impact properties than prior art carbide teeth.
Figure 4 shows another configuration of the invention: a steel tooth 14 with the edges 15 of the front faces 16 (as opposed to the complete front faces as shown on Figure 3) of the cutting tips 17 induction hardened significantly harder than the body 18 behind the front face of the cutting tips.
Figure 5 shows the invention steel tooth 19 after some use where the cutting tip 20 becomes rounded over a relatively small area compared to the prior art tooth shown in Figure 1 thereby eliminating the large rounded tips that are typical of current steel teeth.
Figure 6 shows the invention steel tooth 19 after more use than in Figure 5, showing how the trailing part of the tooth 21 wears more behind the hardened cutting face 22 of the cutting tip 24 since it is softer than the cutting tip face, thereby self sharpening the cutting tip due to this wear pattern. This self sharpening feature will prolong the cutting efficiency and increase the life of the tooth.
Claims (9)
1. A tooth for releasable mounting to a feller buncher circular saw disc, said tooth has a body with a mounting end and a front end distant from the mounting end; at least one cutting tip mounted at the front end, said cutting tip having an induction hardened front face a hardened face that is significantly harder than the rest of the tooth body.
2. The tooth of claim 1 wherein said tooth has four sides and four cutting tips.
3. The tooth of claim 2 wherein said tooth is tapered from the front end to the mounting end.
4. The tooth of claim 3 wherein said tooth is replaceable and rotatable.
5. The tooth of claim 1 wherein said tooth has an induction hardened front face a hardened face.
6. A method of manufacture of a saw tooth for use on a feller buncher circular saw disc, said method comprising; forming of a saw tooth body; forming at least one cutting tip at the front end of said body; induction hardening the front face of at least one said cutting tip.
7. The method of manufacture of a saw tooth of claim 6 wherein the body is formed with four sides and four cutting tips.
8. The method of manufacture of a saw tooth of claim 7 wherein said tooth is tapered from the front end to the mounting end.
9. The method of manufacture of a saw tooth of claim 8 wherein said tooth is replaceable and rotatable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2662894 CA2662894A1 (en) | 2009-04-24 | 2009-04-24 | Hardened saw tooth for circular saw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2662894 CA2662894A1 (en) | 2009-04-24 | 2009-04-24 | Hardened saw tooth for circular saw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2662894A1 true CA2662894A1 (en) | 2009-07-30 |
Family
ID=40911869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2662894 Abandoned CA2662894A1 (en) | 2009-04-24 | 2009-04-24 | Hardened saw tooth for circular saw |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2662894A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010014917A1 (en) * | 2010-04-14 | 2011-10-20 | Mahe Medical Gmbh | Surgical saw blade for use in knee arthroplasty for positioning of implant, has two opposite lying tetrahedrally formed tooth tips formed with four cutting teeth for formation of four cutting edges per four-cutting tooth |
| US11701724B2 (en) | 2017-04-21 | 2023-07-18 | Husqvarna Ab | Cutting blade and method for producing such a blade |
-
2009
- 2009-04-24 CA CA 2662894 patent/CA2662894A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010014917A1 (en) * | 2010-04-14 | 2011-10-20 | Mahe Medical Gmbh | Surgical saw blade for use in knee arthroplasty for positioning of implant, has two opposite lying tetrahedrally formed tooth tips formed with four cutting teeth for formation of four cutting edges per four-cutting tooth |
| DE102010014917B4 (en) * | 2010-04-14 | 2014-01-16 | Mahe Medical Gmbh | Surgical saw blade |
| US11701724B2 (en) | 2017-04-21 | 2023-07-18 | Husqvarna Ab | Cutting blade and method for producing such a blade |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |