GB2353045A - Rotary abrasive cutting disc - Google Patents
Rotary abrasive cutting disc Download PDFInfo
- Publication number
- GB2353045A GB2353045A GB9918357A GB9918357A GB2353045A GB 2353045 A GB2353045 A GB 2353045A GB 9918357 A GB9918357 A GB 9918357A GB 9918357 A GB9918357 A GB 9918357A GB 2353045 A GB2353045 A GB 2353045A
- Authority
- GB
- United Kingdom
- Prior art keywords
- support member
- cutting disc
- rotary cutting
- disc
- weld
- 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.)
- Withdrawn
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000012254 powdered material Substances 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 9
- 229910003460 diamond Inorganic materials 0.000 claims description 7
- 239000010432 diamond Substances 0.000 claims description 7
- 229910000906 Bronze Inorganic materials 0.000 claims description 4
- 239000010974 bronze Substances 0.000 claims description 4
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 3
- 239000010951 brass Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 230000002844 continuous effect Effects 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 229910001092 metal group alloy Inorganic materials 0.000 claims 2
- 229940108928 copper Drugs 0.000 claims 1
- QUQFTIVBFKLPCL-UHFFFAOYSA-L copper;2-amino-3-[(2-amino-2-carboxylatoethyl)disulfanyl]propanoate Chemical compound [Cu+2].[O-]C(=O)C(N)CSSCC(N)C([O-])=O QUQFTIVBFKLPCL-UHFFFAOYSA-L 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/12—Cut-off wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/12—Saw-blades or saw-discs specially adapted for working stone
- B28D1/121—Circular saw blades
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mining & Mineral Resources (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A method of making a rotary cutting disc comprises forming a metal support member (1a), shaping at least one compacted body (4) of powdered material containing abrasive particles so as to enclose at least a portion of the periphery of the support member, and heating the body or bodies to sinter the powdered material and bond the or each body to the periphery of the support member, and then locally applying heat to at least a portion of the external junction between the or each body and the support member to form a weld (6).
Description
2353045 ROTARY ABRASIVE CUTTING DISC
Field of the Invention
This invention relates to a rotary abrasive cutting disc and to a method of manu facturing such a disc.
Background to the Invention
Rotary abrasive cutting discs, particularly diamond cutting discs, are convention ally manufactured in one of several. ways. Where the disc periphery is slotted, individ ual segments of diamond-bearing material may be soldered or braised onto a support ing metal disc. Alternatively, the segments may be welded onto the supporting disc by friction welding, argon arc welding or laser welding. However, because the carrier for the diamond or other abrasive particles is desirably of a relatively soft material, to allow for wearing of the carrier to expose fresh abrasive particles, in use, direct welding may not be possible, and it then becomes necessary to provide each segment with a layer of weldable material such as steel. The working life of such discs is good, but the cost of manufacture is high, since inadequate welding can dramatically reduce strength.
The abrasive particles can be applied to the supporting disc as a surface layer by electro-chemical deposition, but such discs are of lower durability, since the abrasive particles are only on the surface. Another way of forming on the rim of the disc a body of material containing the abrasive particles is to compact a mixture of a powdered sin- terable material and abrasive particles around the rim of the disc and then to sinter it to bond it to the disc. The disc is suitably formed with tabs or keys on the periphery to increase the area of bonding of the sintered material to the disc. The increased bonding area, as compared with welding, coupled with the fact that bonding is even over the area of contact, ensures that a uniform bond of adequate strength is achieved. A con- tinuous cutting surface can be made by this method, if desired. However, unlike the welded materials, the shock resistance of the sintered material is poor, and it can be weakened by heating; if the sintering temperature is exceeded the material will soften and break up.
Summary of the Invention
The invention provides a rotary cutting disc, comprising a metal support member, at least one body of a sintered powdered material containing abrasive particles formed on the periphery of the support member, and a weld formed along the junction 5 between the or each body and the support member.
The invention also provides a method of making a rotary cutting disc, comprising forming a metal support member, shaping at least one compacted body of powdered material containing abrasive particles so as to enclose at least a portion of the periphery of the support member, and heating the body or bodies to sinter the powdered material and bond the or each body to the periphery of the support member, and then locally applying heat to at least a portion of the external junction between the or each body and the support member to form a weld.
Preferably, the abrasive particles are diamond, while the sintered material is preferably a metal, for example copper or an alloy thereof, for example, bronze or brass.
The welding is suitably carried out by laser welding, and preferably the weld penetrates the support member, which is suitably in the general form of a disc, to a Significant proportion of the thickness thereof, for example of the order of a quarter of the thickness.
The rim of the disc may be continuous or it may be segmented in the manner known for conventional cutting discs, with the shape of the slots between the segments being of any suitable form, for example as used in conventional cutting discs.
The cutting discs of the invention are at least comparable with conventional welded discs in terms of strength and durability, whilst being considerably less costly to manufacture. It is also possible to form a continuous body of material giving a performance equivalent to conventional welded discs, which is not heretofore been possible.
It is believed that the sintered bond will constitute approximately 60% of the strength of the bond of the cutting edge to the disc, with the laser weld contributing the remainder. It is thus possible to use bronze materials for which laser welding would not, on its own, be considered sufficient.
Brief Description of the Drawings
In the drawings, which illustrate exemplary embodiments of the invention:
Figure 1 is an enlarged view of a portion of the periphery of a cutting disc ac cording to one embodiment; Figure 2 is a sectional view on line A-A in Figure 1; and Figure 3 is a view of a disc according to another embodiment of the invention.
Detailed Description of the Illustrated Embodiment
Referring first to Figures 1 and 2, a segmented cutting disc has a plurality of separate cutting segments 1 around its periphery, defined by shaped inwardly directed slots 2. While the slots may take any of a wide range of different shapes, the illustrated slots 2 each terminate in an offset circular aperture 3.
The view shown in Figure 1 represents just two segments on the periphery of a circular disc, and it will therefore be understood that a segmented cutting disc may have a large number of segments, for example sixteen for a 230mm diameter disc. How ever, the cutting disc may have a smaller number of segments, and these may be sepa rated by narrow slots or by slots substantially equal in width to the segments.
The bodies 4 are formed by preparing a mixture of the abrasive particles and the softer material in powdered form, shaping the mixture around a peripheral part of each segment portion 1 a, as may be seen from Figure 2, and then heating the body to sinter the powdered material together on the disc segment. The disc segment has a tab or key 5 extending from the outermost edge thereof to increase the surface area for bonding of the sintered material, in conventional manner. Laser welding is then carried out on opposed sides of the body 4 along the junction 6 between the lowermost edge of the body 4 and the segment portion 1 a, to a depth which, for example, may be ap proximately equal to a third of the thickness of the disc support.
In the embodiment illustrated in Figure 3, the disc 30 is not segmented but in stead has a continuous body 31 of abrasive material and carrier formed on its periphery in the same manner as set out hereinbefore with reference to Figures 1 and 2. Again, a weld 32 is formed along the innermost edge of the body 31 on each side of the disc, using laser welding techniques conventional in the field of diamond cutting disc manufac- ture. This provides the strength advantages of welding not previously obtainable for a continuous cutting edge, for which welding would be impossible.
Claims (16)
1 A rotary cutting disc comprising a metal support member, at least one body of a sintered powdered material containing abrasive particles formed on the pe riphery of the support member, and a weld formed along the junction between the or each body and the support member.
2. A rotary cutting disc according to Claiml, wherein the abrasive particles are diamond.
3. A rotary cutting disc according to Claim 1 or 2, wherein the sintered material is a metal or a metal alloy.
4. A rotary cutting disc according to Claim 3, wherein the sintered material in copper, bronze or brass.
5. A rotary cutting disc according to any preceding claim, wherein the pe riphery of the disc is segmented or slotted.
6. A rotary cutting disc according to any of Claims 1 to 4, wherein the pe riphery of the disc is continuous.
7. A rotary cutting disc, substantially as described with reference to, or as shown in, the drawings.
8. A method of making a rotary cutting disc, comprising forming a metal support member, shaping at least one compacted body of powdered material contain ing abrasive particles so as to enclose at least a portion of the periphery of the support member, and heating the body or bodies to sinter the powdered material and bond the or each body to the periphery of the support member, and then locally applying heat to at least a portion of the external junction between the or each body and the support member to form a weld.
9. A method according to Claim 8, wherein each weld is formed by laser welding.
10. A method according to Claim 8 or 9, wherein each weld penetrates the support member to a significant proportion of the thickness thereof.
11. A method according to Claim 10, wherein each weld penetrates the support member to a quarter of the thickness thereof
12. A method according to any of Claims 8 to 11, wherein the powdered material is a metal or a metal alloy.
13. A method according to Claim 12, therein the powdered material is cop per, bronze or brass.
14. A method according to any of Claims 8 to 13, wherein the abrasive par ticles are diamond.
15. A method according to any of Claims 8 to 14, wherein the body is con tinuous around the rim of the support member.
16. A method of making a rotary cutting disc, substantially as described with reference to the drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9918357A GB2353045A (en) | 1999-08-05 | 1999-08-05 | Rotary abrasive cutting disc |
| EP00306275A EP1074345A3 (en) | 1999-08-05 | 2000-07-24 | Rotary abrasive cutting disc |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9918357A GB2353045A (en) | 1999-08-05 | 1999-08-05 | Rotary abrasive cutting disc |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9918357D0 GB9918357D0 (en) | 1999-10-06 |
| GB2353045A true GB2353045A (en) | 2001-02-14 |
Family
ID=10858551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9918357A Withdrawn GB2353045A (en) | 1999-08-05 | 1999-08-05 | Rotary abrasive cutting disc |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1074345A3 (en) |
| GB (1) | GB2353045A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0372141A2 (en) * | 1987-06-10 | 1990-06-13 | Les Techniques Du Diamant Technidiam S.A. | Diamond disc for cutting hard or abrasive products |
| WO1995024986A1 (en) * | 1994-03-16 | 1995-09-21 | Diamant Boart, Inc. | Method of manufacturing a segmented diamond blade |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19653975A1 (en) * | 1995-12-31 | 1997-10-30 | Kimiko Sueta | Disk type wheel cutter for metal processing |
| DE19712448C2 (en) * | 1997-03-08 | 2000-07-27 | Diamik Diamant Werkzeuge Gmbh | Master blade for a rotating machining tool |
-
1999
- 1999-08-05 GB GB9918357A patent/GB2353045A/en not_active Withdrawn
-
2000
- 2000-07-24 EP EP00306275A patent/EP1074345A3/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0372141A2 (en) * | 1987-06-10 | 1990-06-13 | Les Techniques Du Diamant Technidiam S.A. | Diamond disc for cutting hard or abrasive products |
| WO1995024986A1 (en) * | 1994-03-16 | 1995-09-21 | Diamant Boart, Inc. | Method of manufacturing a segmented diamond blade |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1074345A3 (en) | 2002-10-16 |
| GB9918357D0 (en) | 1999-10-06 |
| EP1074345A2 (en) | 2001-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| COOA | Change in applicant's name or ownership of the application | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |