GB2238014A - Saw blade - Google Patents
Saw blade Download PDFInfo
- Publication number
- GB2238014A GB2238014A GB8922990A GB8922990A GB2238014A GB 2238014 A GB2238014 A GB 2238014A GB 8922990 A GB8922990 A GB 8922990A GB 8922990 A GB8922990 A GB 8922990A GB 2238014 A GB2238014 A GB 2238014A
- Authority
- GB
- United Kingdom
- Prior art keywords
- saw blade
- metal layers
- plastics layer
- layers
- saw
- 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.)
- Granted
Links
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
- B23D61/025—Details of saw blade body
- B23D61/026—Composite body, e.g. laminated, body of diverse material
Abstract
A saw blade, which in use has significantly improved sound characteristics, comprises a body having a cutting edge defined thereon, the body being formed from a plurality of metal layers laminated together by means of one or more plastics layers. A circular saw may be formed from a circular blank punched out of material comprising two steel layers laminated together by a layer of viscoelastic polymer such as ethyl vinyl acetate.
Description
SAW BLADE
The present invention relates to saw blades, especially power driven saw blades, and is aimed at improving the sound characteristics of such blades. The present invention is particularly applicable to circular saw blades.
In general, saw blades for use with power tools are manufactured from single sheets of steel which are cut to size before having the cutting teeth shaped in the cutting edge. The cutting teeth are often coated in tungsten carbide to provide a more hard wearing cutting edge.
In use, however, such prior art cutting blades, especially if they are of the circular saw type, are extremely noisy due to the natural harmonics of the single sheet blade. Accordingly, a saw blade which in use does not whine in such a loud manner as known blades would be a marked improvement over the prior art. The present invention aims to provide such an improved saw blade.
According to the present invention there is provided a saw blade, which in use has significantly improved sound characteristics, comprising a body having a cutting edge defined thereon, the body being formed from a plurality of metal layers laminated together by means of one or more plastics layer.
Preferably the saw blade comprises a single plastics layer between two metal layers. However, a saw blade according to the present invention could be made up of more metal layers and intervening laminated plastics layers, such as three metal layers separated by two plastics layers. The number of layers obviously effects the natural harmonics of the saw blade, and therefore can be selected as appropriate.
The plastics layer preferably contains a viscoelastic polymer, the polymer more preferably containing a metallic or non-metallic filler. A suitable viscoelastic polymer for use in the present invention is ethyl vinyl acetate (EVA), but it will of course be appreciated that other polymers may also be used. In certain circumstances it may also be preferably to include two different polymer layers between adjacent metal layers.
In general saw blades are made primarily of steel, but in certain applications it may be preferable to use other metal based materials. In a preferred embodiment of the present invention the metal layers are made from carbon steel 75-80 having a hardness of 40-48 Rc (Rockwell hardness).
The preferred thickness of a saw blade is in the region of l.5-2.Omm. Accordingly, a saw blade according to the present invention having a single plastics layer between two metal layers will have a preferred thickness of 1.5-2.Omm.
Such a thickness is preferably made up primarily from the thickness of the two metal layers, the plastics layer being simply a thin film of viscoelastic polymer having negligible thickness.
The plastics layer may of course be substantially thicker than a thin film, and if this is the case the noise properties of the saw blade will be different. Accordingly, the required properties to be associated with a saw blade can be selected by varying the thicknesses of the metal layers and/or plastics layer or layers.
In a preferred embodiment of the present invention, the teeth of the saw blade have tip pockets which accommodate tungsten carbide tips. Such a saw blade is harder wearing, and hence lasts longer, than blades having no such tips.
Although the present invention is most applicable to circular saw blades, since such blades tend to produce a great deal of noise when in use, other types of saw blade can of course be made according to the present invention.
Here follows a description of a specific embodiment of the present invention which is provided purely by way of example.
A circular saw blade according to the present invention is formed by punching out a round blank from a strip or coil of laminated steel and ethyl vinyl acetate. The two layers of carbon steel 75-80 are both approximately 0.8mm thick and the EVA plastics layer is of negligible thickness, but is sufficient to separate the two steel layers.
Teeth and tip pockets are then punched onto the circumference of the round blank of laminated material before brazing media and flux are applied to the tip seat pockets. The tip seat pockets are then heated using a high frequency radiation source and at the same time the tips are placed in the molten brazing media. This part of the manufacturing process of the saw blade may be automated.
The saw blade is then flattened and/or straightened as required before being polished and cleaned as appropriate.
The tungsten carbide tips are diamond lapped to perfect the teeth size and cutting angles. Written information is then printed on the body faces of the saw blade by using silk screen techniques. As a finishing surface, a rust protector is applied.
Circular saw blades of any diameter may be manufactured from laminated steel and plastics material, but obviously the effect of the blade being laminated will vary depending on the size of the blade itself. In any event, such circular saw blades produce far less noise when in use than known circular saw blades, and it is therefore submitted that the present invention is a marked improvement over the prior art.
It will of course be understood that the present invention has been described above purely by way of example, and modifications of detail can be made within the scope of the invention.
Claims (8)
1. A saw blade, which in use has significantly improved sound characteristics, comprising a body having a cutting edge defined thereon, the body being formed from a plurality of metal layers laminated together by means of one or more plastics layer.
2. A saw blade as claimed in claim 1, wherein the or each plastics layer contains a viscoelastic polymer.
3. A saw blade as claimed in claim 2, wherein the viscoelastic polymer is ethyl vinyl acetate.
4. A saw blade as claimed in any preceding claim, wherein two steel layers are laminated together by means of a single plastics layer.
5. A saw blade as claimed in any preceding claim, wherein the metal layers are made from carbon steel.
6. A saw blade as claimed in any preceding claim, wherein the overall thickness of the blade is between 1.5mm and 2.Omm.
7. A saw blade as claimed in any preceding claim, wherein the cutting edge includes a plurality of teeth having tungsten carbide tips.
8. A saw blade substantially as hereinbefore described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8922990A GB2238014B (en) | 1989-10-12 | 1989-10-12 | Saw blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8922990A GB2238014B (en) | 1989-10-12 | 1989-10-12 | Saw blade |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8922990D0 GB8922990D0 (en) | 1989-11-29 |
| GB2238014A true GB2238014A (en) | 1991-05-22 |
| GB2238014B GB2238014B (en) | 1992-09-30 |
Family
ID=10664458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8922990A Expired - Fee Related GB2238014B (en) | 1989-10-12 | 1989-10-12 | Saw blade |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2238014B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0569343A1 (en) * | 1992-05-06 | 1993-11-10 | Sandvik Aktiebolag | Saw blade |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3799025A (en) * | 1971-07-23 | 1974-03-26 | Garbo P | Vibration-damped rotatable cutting disk |
| GB1370901A (en) * | 1970-12-14 | 1974-10-16 | Nora Gomex Ab | Rotary machine tools |
| GB1446360A (en) * | 1973-01-17 | 1976-08-18 | Gomex Verktyg Ab | Rotary saw blades and methods of making rotary saw blades |
| GB1551553A (en) * | 1976-05-25 | 1979-08-30 | Salje E | Circular saw blade |
| GB1581961A (en) * | 1976-09-16 | 1980-12-31 | Minnesota Mining & Mfg | Sound-damped saw blade |
-
1989
- 1989-10-12 GB GB8922990A patent/GB2238014B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1370901A (en) * | 1970-12-14 | 1974-10-16 | Nora Gomex Ab | Rotary machine tools |
| US3799025A (en) * | 1971-07-23 | 1974-03-26 | Garbo P | Vibration-damped rotatable cutting disk |
| GB1446360A (en) * | 1973-01-17 | 1976-08-18 | Gomex Verktyg Ab | Rotary saw blades and methods of making rotary saw blades |
| GB1551553A (en) * | 1976-05-25 | 1979-08-30 | Salje E | Circular saw blade |
| GB1581961A (en) * | 1976-09-16 | 1980-12-31 | Minnesota Mining & Mfg | Sound-damped saw blade |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0569343A1 (en) * | 1992-05-06 | 1993-11-10 | Sandvik Aktiebolag | Saw blade |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8922990D0 (en) | 1989-11-29 |
| GB2238014B (en) | 1992-09-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4106382A (en) | Circular saw tool | |
| CA1080478A (en) | Device for cutting lead wires | |
| US3640027A (en) | Annular cutting blades | |
| CA2476781A1 (en) | Tool insert | |
| JP5254238B2 (en) | blade | |
| US20030094078A1 (en) | Gritted saw blade | |
| JP6766181B2 (en) | tool | |
| EP0095228B1 (en) | Treatment of coated glass | |
| GB2238014A (en) | Saw blade | |
| US5704828A (en) | Saw blade with sanding surface | |
| US2318549A (en) | Metal cutting saw band | |
| US2533648A (en) | Circular saw making | |
| JP2009072900A (en) | Sheet cutting device | |
| US4262650A (en) | Expensive abrasive base cutting wheels with a metallic core notched at the periphery | |
| JP3199679U (en) | Single-edged sharpening tool with small blade made of hard film | |
| JPH0852614A (en) | Damping base metal for circular saw | |
| JPS6040246A (en) | Composite material for tool having excellent vibration-damping property | |
| JP7345808B2 (en) | End mill and its manufacturing method | |
| FR2356491A1 (en) | Vibration damped stone cutting saw - has core of two metal discs clamped together and sandwiching damping sheet | |
| JP2662699B2 (en) | Slitter knife | |
| JPH0531823U (en) | Plate-shaped tool body consisting of two-layer structure | |
| WO2020084958A1 (en) | End mill and manufacturing method thereof | |
| JPH0749165B2 (en) | Coated cemented carbide tool with excellent impact resistance | |
| RU2082566C1 (en) | Cutting tool for device for separation of sheet nonmetallic material | |
| GB722932A (en) | Improved letters, signs, symbols and the like, and method of producing the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20051012 |