CN101817171B - Thin resin grinding wheel - Google Patents
Thin resin grinding wheel Download PDFInfo
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- CN101817171B CN101817171B CN200910046845.3A CN200910046845A CN101817171B CN 101817171 B CN101817171 B CN 101817171B CN 200910046845 A CN200910046845 A CN 200910046845A CN 101817171 B CN101817171 B CN 101817171B
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- layer
- abrasive
- grinding
- angle
- armature bed
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Abstract
The invention relates to a thin resin grinding wheel comprising a cutting sheet and an angle-grinding sheet. The thin resin grinding wheel comprises a grinding layer containing grinding materials and cementing agents, wherein the thin resin grinding wheel comprises at least one reinforcing material layer; the reinforcing material layer is combined with the grinding layer; and the grinding materials contained in the grinding layer contain garnets with volume from 5 percent to 70 percent.
Description
Technical field
The present invention relates to a kind of thin resin grinding wheel.Specifically, the resin wheel that the present invention relates to comprises cutting blade and angle abrasive disc.
Background technology
Thin resin grinding wheel comprises cutting blade and angle abrasive disc, and these resin wheels are widely used in machining.These thin resin grinding wheels, especially high speed thin resin grinding wheel can carry out cutting, the operation of shaping and polishing rapidoprint and so on, are of wide application.Abrasive grain is combined together to form a disc structure by binding agent by these emery wheels usually.At present, in resin wheel, normally used abrasive material is Brown Alundum (BFA), and main chemical compositions is AL
2o
3, its intensity is high, toughness is large.
At home on market, the stock size of resin wheel comprises 400 × 3 × 25mm, 100 × 6 × 22mm, 125 × 6 × 22mm and 150 × 6 × 22mm.Resin wheel is made by steps such as batch mixing, compacting and solidifications.The resin wheel of 400 × 3 × 25mm in above-mentioned specification is generally used for the field cuttings such as casting, Metal Cutting and machined.When the equipment that rotating speed is 2870rpm when adopting power to be 3KW uses specification to be the resin wheel of 400 × 3 × 25mm on 20# carbon steel, the grinding ratio (G-ratio, that is, material removal amount/abrasion of grinding wheel amount) of this resin wheel is between 0.5-0.8.100 × 6 × 22mm, the resin wheel of 125 × 6 × 22mm and these specifications of 150 × 6 × 22mm is generally used for the field polishings such as shipbuilding, machined and heavy-duty machinery, the resin wheel of these specifications needs balance grinding ratio and grinding efficiency (GE, material removal amount/polishing time, g/min) between relation.When adopting power to be 1.4KW rotating speed be the equipment of 10000rpm to polish to 45# carbon steel sheet, grinding ratio and the grinding efficiency of the resin wheel of 125 × 6 × 22mm are respectively 6-8 and 22-25g/min.But the high-speed resin emery wheel cost using Brown Alundum as basic raw material manufacture is relatively high.
No. 1025672nd, the Canadian Patent of Norton company discloses a kind of resin wheel, and abrasive mixture wherein comprises garnet, aluminium oxide, fused alumina zirconia or zirconium spinel abrasive material, and wherein abrasive mixture comprises the garnet of 5-50% volume.
Conventional garnet comprises 17.5 ± 2.5%Al
2o
3, 22.5 ± 2.5%Fe
2o
3and 37.5 ± 2.5%SiO
2.Garnet is a kind of abrasive material of low cost.Although but garnet becomes price very low, and be distributed in the countries such as the U.S., Canada, Australia, India and China widely, but the product of garnet as the abrasive material of high speed thin resin grinding wheel is not occurred in the market, this is because thin resin grinding wheel can be subject to great pressure at work, and garnet is highly brittle compared with other abrasive material, and hardness is lower.Comprise the usual wear rate of garnet resin wheel high, and metal grinding efficiency is low.
Summary of the invention
The object of the present invention is to provide a kind of thin resin grinding wheel, this resin wheel can meet the serviceability requirement of high speed grinding apparatus with low-down cost.
A kind of thin resin grinding wheel according to the present invention comprises the grinding layer with abrasive material and binding agent, and at least armature bed of material that combines with grinding layer of one deck, and the abrasive package wherein in grinding layer is containing the garnet of 30% to 70% volume, and remaining abrasive material is Brown Alundum.
Preferably, the abrasive package in above-mentioned resin wheel is containing the garnet of 5% to 60% volume.
In addition, according to another aspect of the present invention, a kind of cutting blade comprises the grinding layer with abrasive material and binding agent, the at least armature bed of material that combines with grinding layer of one deck, wherein, the abrasive package in grinding layer is containing the garnet of 35% to 60% volume, and remaining abrasive material is Brown Alundum.
Preferably, in above-mentioned cutting blade, the armature bed of material is arranged on grinding layer inside.
Preferably, the armature bed of material is provided with two-layer, and the two-layer armature bed of material can be separately positioned on two outer surfaces of grinding layer.
In addition, according to another aspect of the present invention, a kind of angle abrasive disc comprises the grinding layer with abrasive material and binding agent, described grinding layer comprises substrate layer and polishing layer, and at least two-layer armature bed of material combined with grinding layer, the armature bed of material combines with grinding layer, wherein, abrasive package in polishing layer is containing the garnet of 30% to 50% volume, and remaining abrasive material is Brown Alundum.
Preferably, in the abrasive disc of above-mentioned angle, the ground floor armature bed of material in the armature bed of material is combined in grinding layer inside, thus described grinding layer is divided into a substrate layer and a polishing layer, and the second layer armature bed of material in the described armature bed of material covers on the outer surface of described substrate layer.
Preferably, at above-mentioned angle abrasive disc, the armature bed of material also comprises the third layer armature bed of material, and it covers on the outer surface of polishing layer of described grinding layer at least partly.
In addition, the abrasive package in the substrate layer of angle abrasive disc is containing the garnet of 100% volume, and the abrasive package in described polishing layer contains the garnet of 0% to 50% volume, and all the other abrasive materials are preferably Brown Alundum (BFA).
Preferably, grinding layer inside can be combined with the two-layer armature bed of material, thus grinding layer being divided into substrate layer, intermediate layer and polishing layer, the abrasive package in wherein said substrate layer is containing the garnet of 100% volume, and the abrasive package in described polishing layer contains the garnet of 0% to 50% volume.
In addition, according to the working speed of cutting blade of the present invention in the scope of 72m/s-120m/s, that is, cutting blade is with the linear velocity cut workpiece of 72m/s to 120m/s, and the thickness of cutting blade is between 0.5-10mm.According to the working speed of angle of the present invention abrasive disc in the scope of 72m/s-120m/s, that is, angle abrasive disc is with the linear velocity buffing work-piece of 72m/s to 120m/s, and the thickness of angle abrasive disc is between 3-8mm.
The above-mentioned armature bed of material is woven web, and preferably, the described armature bed of material is glass fiber mesh.
Accompanying drawing explanation
Fig. 1 is the generalized section of cutting blade according to a first embodiment of the present invention.
Fig. 2 is the generalized section of cutting blade according to a second embodiment of the present invention.
Fig. 3 is the generalized section of angle abrasive disc according to a third embodiment of the present invention.
Fig. 4 is the generalized section of angle abrasive disc according to a fourth embodiment of the present invention.
Fig. 5 is the generalized section of angle abrasive disc according to a fifth embodiment of the present invention.
Detailed description of the invention
Fig. 1-5 is the schematic diagram of the various embodiments according to thin resin grinding wheel of the present invention.The resin wheel that the present invention relates to is the slim resin wheel of high speed, and these resin wheels are suitable for engaging with workpiece with the tangential contact velocity of 72m/s to 120m/s usually, and these resin wheels can comprise cutting blade and angle abrasive disc.Fig. 1-2 is the schematic diagram of the embodiment according to cutting blade of the present invention, and Fig. 3-5 is the schematic diagram of the embodiment according to angle of the present invention abrasive disc.At least one deck reinforcement material layer that this resin wheel comprises grinding layer and combines with grinding layer, be glass fiber mesh in a specific embodiment, wherein the mixture of grinding layer comprises the garnet of 5%-70% volume.
Below, by reference to the accompanying drawings multiple embodiment of the present invention is illustrated.
Fig. 1 shows the cross-section structure of cutting blade according to a first embodiment of the present invention.Grinding layer in cutting blade 1 has been divided into the first grinding layer 10-1 and the second grinding layer 10-2, and cutting blade is also particularly including the fiber mesh cloth 20 between the first grinding layer and the second grinding layer.The thickness of cutting blade is usually between 0.5-4mm.Grinding layer comprises abrasive material, binding agent and suitable additive, and according to the present invention, the abrasive material in the grinding layer of cutting blade comprises the garnet of 5%-60%, and remaining abrasive material is BFA.It should be noted that, also can arrange layer glass fiber mesh cloth 20 in grinding layer inside, correspondingly grinding layer will be divided into three layers.
Comparative example one
Make according to the cross-section structure of the cutting blade of the first embodiment multiple cutting blades that specification is 400 × 3 × 25mm, emery wheel conventional in these cutting blades and Chinese market is compared.The grinding layer of cutting blade comprises the pore of the abrasive material of 52% volume, the binding agent of 32% volume and 16% volume.Binding agent comprises phenolic resins and the filler such as troilite, ice crystal.Abrasive mixture can comprise the garnet of 5%-60% volume, all the other are Brown Alundum (BFA), the wherein particle size range of Brown Alundum (GB-T2481.1-1998) in F16-F80, and garnet granularity is at F20-F80(GB-T2481.1-1998) scope in.The test data of the garnet cutting blade comprising different content is listed in following table:
Table one
Can see from the data of upper table, even if garnet volume content reaches 60% in abrasive material, its performance of cutting blade adopting the present invention to optimize structure still can reach the technical requirement of the conventional emery wheel of Chinese market.But it should be noted that, when garnet volume percent content is more than 60%, the Performance and quality of abrasive cut-off wheel can be obviously deteriorated, do not reach use standard.
Fig. 2 shows the cross-section structure of cutting blade according to a second embodiment of the present invention.As another kind of version, cutting blade comprises one deck grinding layer 10, and two surfaces up and down of this grinding layer 10 arrange layer glass fiber mesh cloth 20-1 and 20-2 respectively.This grinding layer comprises abrasive material, binding agent and suitable additive equally, and abrasive material comprises the garnet of 5%-60% volume.
Fig. 3 shows the cross-section structure of angle abrasive disc 3 according to a third embodiment of the present invention.This angle abrasive disc 3 comprises the first glass fiber mesh 20-1 of the upper surface covering grinding layer from top to down respectively, is placed in lower surface the 3rd glass fiber mesh 20-3 of the second glass fiber mesh 20-2 in grinding layer and local complexity grinding layer from direction as shown.Like this, grinding layer has been divided into an a substrate layer 10-1 and polishing layer 10-2 by the second glass fiber mesh 20-2.Grinding layer comprises abrasive material, binding agent and suitable additive equally, and the abrasive package wherein in the abrasive disc of whole angle is containing the garnet of 5%-70% volume.Preferably, the abrasive material in the substrate layer 10-1 of angle abrasive disc 3 comprises the garnet of 100% volume usually, and the abrasive material of polishing in layer 10-2 can comprise the garnet of 0-50% volume.
Comparative example two
Make according to the cross-section structure of the angle abrasive disc of the 3rd embodiment multiple angles abrasive disc that specification is 125 × 6 × 22mm, conventional emery wheel in these angle abrasive discs and Chinese market is compared.The substrate layer of 40% volume is comprised, the polishing layer of 60% volume and triplex glass fiber mat according to angle of the present invention abrasive disc.Abrasive material 100% volume in substrate layer is garnet, and the garnet percent by volume of polishing in layer is between 0% to 50%, and BFA selected by remaining abrasive material.The wherein particle size range of Brown Alundum (GB-T2481.1-1998) in F16-F80, and garnet granularity is at F20-F80(GB-T2481.1-1998) scope in.The test data of the garnet cutting blade comprising different content is listed in following table:
Table two
Experimental result shows, when the garnet content in substrate layer reaches 100% and the garnet content of polishing in layer reaches the garnet total content of 50%(is about 70%) time, the technical requirement of conventional emery wheel in Chinese market still can be reached according to the grinding ratio of angle of the present invention abrasive disc and GE.Angle of the present invention abrasive disc can not cause workpiece burn substantially.When garnet volume content is more than 70%, the overall performance of angle abrasive disc can significantly decline.In addition, can also see, when floor of polishing in the abrasive disc of angle contains garnet (i.e. No. 2 grinding disc) of 10%, the grinding efficiency (GE) of angle abrasive disc uses the BFA(of 100% volume i.e. No. 1 grinding disc than polishing floor) higher.When polishing the garnet adopting 50% in layer, Wheel hardness grade being strengthened to R level for obtaining preferably grinding ratio (G-ratio).
Fig. 4 shows the cross-section structure of angle abrasive disc according to a fourth embodiment of the present invention.Angle abrasive disc 4 shown in Fig. 4 comprises the first glass fiber mesh 20-1, substrate layer 10-1, the second glass fiber mesh 20-2 and polishing layer 10-2 from top to down.Similarly, the substrate layer 10-1 as grinding layer comprises abrasive material and binding agent with polishing layer 10-2, and comprises suitable additive.In this angle abrasive disc 4, the content of garnet percent by volume is in the scope of 5%-70%.Preferably, in the substrate layer 10-1 of angle abrasive disc 4, abrasive material can comprise the garnet of 100% volume, and the abrasive material of polishing in layer 10-2 can comprise the garnet of 0-50% volume.
Fig. 5 shows the cross-section structure of angle abrasive disc according to a fifth embodiment of the present invention.Different from the embodiment of Fig. 4, layer glass fiber mesh cloth 20-1 and 20-2 of the angle abrasive disc 5 shown in Fig. 5 is all arranged on the inside of grinding layer, correspondingly, grinding layer has been divided into three one-tenth, one deck of diagram the top is substrate layer 10-1, one deck polishing layer 10-2 of diagram bottom, has one deck intermediate layer 10-3 between substrate layer 10-1 and polishing layer 10-2.Similarly, in the substrate layer 10-1 of angle abrasive disc 4, abrasive material can comprise the garnet of 100% volume, and the abrasive material in polishing layer 10-2 can comprise the garnet of 0-50% volume, and the material in intermediate layer can be selected according to practical application.In addition, the angle abrasive disc 5 of Fig. 5 also can arrange the setting of a glass fiber mesh (in see Fig. 3 glass fiber mesh 20-3) partly on polishing layer outer surface.
It should be noted that, also can arrange triplex glass fiber mesh cloth 20 in grinding layer inside, correspondingly grinding layer will be divided into four layers.
In addition, for the circular cutting blade shown in Fig. 1 and 2, its diameter range is between 25-900mm, and preferably between 100-400mm, and the thickness of cutting blade is between 0.5-10mm, better between 0.5-4mm.For the angle abrasive disc shown in Fig. 3 and 4, its diameter range is between 50-300mm, and its thickness is between 3-8mm.
The glass fiber mesh that adopts in the resin wheel of cutting blade according to the present invention and angle abrasive disc and so on is by being formed fiberglass weaving after impregnation, and filament diameter is generally at 9-11 μm.In addition, the additive comprised in grinding layer can be water gypsum, active filler and inactive filler etc.
In addition, in conjunction with technical requirement when cost and actual use, preferably, for the cutting blade shown in Fig. 1 and Fig. 2, garnet volume content can control within the scope of 50%-60%; For the grinding disc shown in Fig. 3 and Fig. 4, the garnet volume content of substrate layer preferably controls 100%, and the garnet volume content of layer of polishing controls between 0%-50%.
For the cutting blade 1 shown in Fig. 1, layer of glass screen cloth 20 is arranged on the centre position of grinding layer 10 usually.For the angle abrasive disc 3,4 shown in Fig. 3 and 4; the thickness proportion of substrate layer 10-1 and polishing layer 10-2 can change in the scope of 1:9-4:6; preferably; the thickness of substrate layer 10-1 should control less than 40% of the thickness at whole angle abrasive disc, unaffected to guarantee the whole processing performance of angle abrasive disc; For the angle abrasive disc 5 shown in Fig. 5, the thickness proportion between substrate layer 10-1, intermediate layer 10-3 and polishing layer 10-2 can be preferably 1:2:7 or 2:3:5.
Garnet in the present invention can comprise pyrope, almandine, spessartine, grossularite, trautwinite or andradite.According to the abrasive material in thin resin grinding wheel of the present invention, except garnet, remaining abrasive material preferably selects Brown Alundum.
Although above-mentioned accompanying drawing and explanation are described several specific embodiment of the present invention; but foregoing description is only clear and describes better embodiment of the present invention; do not play any restriction effect to protection scope of the present invention, protection scope of the present invention will be defined by the appended claims.
Claims (18)
1. a thin resin grinding wheel, described resin wheel comprises the grinding layer with abrasive material and binding agent, and at least armature bed of material that combines with described grinding layer of one deck, it is characterized in that, described abrasive package in described grinding layer is containing the garnet of 30% to 70% volume, described garnet comprises pyrope, almandine, spessartine, grossularite, trautwinite or andradite, and remaining abrasive material is Brown Alundum.
2. thin resin grinding wheel as claimed in claim 1, it is characterized in that, the described armature bed of material is woven web.
3. thin resin grinding wheel as claimed in claim 1, it is characterized in that, the described armature bed of material is glass fiber mesh.
4. a cutting blade, described cutting blade comprises the grinding layer with abrasive material and binding agent, and at least armature bed of material that combines with described grinding layer of one deck, it is characterized in that, described abrasive package in described grinding layer is containing the garnet of 35% to 60% volume, described garnet comprises pyrope, almandine, spessartine, grossularite, trautwinite or andradite, and remaining abrasive material is Brown Alundum.
5. cutting blade as claimed in claim 4, is characterized in that, it is inner that the described armature bed of material is arranged on described grinding layer.
6. cutting blade as claimed in claim 4, it is characterized in that, the described armature bed of material is provided with two-layer.
7. cutting blade as claimed in claim 6, it is characterized in that, the described two-layer armature bed of material is separately positioned on two outer surfaces of described grinding layer.
8. cutting blade as claimed in claim 4, it is characterized in that, cutting blade is with the linear velocity cut workpiece of 72m/s to 120m/s, and the thickness of described cutting blade is between 0.5-10mm.
9. cutting blade as claimed in claim 4, it is characterized in that, the described armature bed of material is woven web.
10. cutting blade as claimed in claim 4, it is characterized in that, the described armature bed of material is glass fiber mesh.
11. 1 kinds of angle abrasive discs, described angle abrasive disc comprises the grinding layer with abrasive material and binding agent, described grinding layer comprises substrate layer and polishing layer, and the armature bed of material that at least two-layer and described grinding layer combines, it is characterized in that, described abrasive package in described polishing layer is containing the garnet of 30% to 50% volume, and described garnet comprises pyrope, almandine, spessartine, grossularite, trautwinite or andradite, and remaining abrasive material is Brown Alundum.
12. angle as claimed in claim 11 abrasive discs, it is characterized in that, the ground floor armature bed of material in the described armature bed of material is combined in grinding layer inside, thus described grinding layer being divided into described substrate layer and described polishing layer, the second layer armature bed of material in the described armature bed of material covers on the outer surface of described substrate layer.
13. angle as claimed in claim 11 abrasive discs, is characterized in that, it is inner that the described at least two-layer armature bed of material is combined in described grinding layer, thus grinding layer is divided into substrate layer, intermediate layer and polishing layer.
14. angle abrasive discs as described in one of claim 11-13, it is characterized in that, the described armature bed of material also comprises the third layer armature bed of material, and it covers outside the outer surface of described polishing layer of described grinding layer at least partly.
15. angle abrasive discs as described in claim 12 or 13, is characterized in that, the abrasive package in described substrate layer is containing the garnet of 100% volume.
16. angle as claimed in claim 11 abrasive discs, is characterized in that, angle abrasive disc is with the linear velocity buffing work-piece of 72m/s to 120m/s, and the thickness of described angle abrasive disc is between 3-8mm.
17. angle as claimed in claim 11 abrasive discs, it is characterized in that, the described armature bed of material is woven web.
18. angle as claimed in claim 11 abrasive discs, it is characterized in that, the described armature bed of material is glass fiber mesh.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046845.3A CN101817171B (en) | 2009-02-27 | 2009-02-27 | Thin resin grinding wheel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910046845.3A CN101817171B (en) | 2009-02-27 | 2009-02-27 | Thin resin grinding wheel |
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| Publication Number | Publication Date |
|---|---|
| CN101817171A CN101817171A (en) | 2010-09-01 |
| CN101817171B true CN101817171B (en) | 2015-03-18 |
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ID=42652521
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910046845.3A Expired - Fee Related CN101817171B (en) | 2009-02-27 | 2009-02-27 | Thin resin grinding wheel |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554809B (en) * | 2010-12-30 | 2015-02-04 | 圣戈班磨料磨具(上海)有限公司 | Grinding wheel with inspection windows |
| CN104249309A (en) * | 2013-06-28 | 2014-12-31 | 圣戈班磨料磨具有限公司 | Discontinuous fiber reinforced thin wheel |
| EP3013527B1 (en) | 2013-06-28 | 2023-03-01 | Saint-Gobain Abrasives, Inc. | Abrasive article reinforced by discontinuous fibers |
| EP3013529B1 (en) | 2013-06-28 | 2022-11-09 | Saint-Gobain Abrasives, Inc. | Abrasive article |
| DE102013110237A1 (en) * | 2013-09-17 | 2015-03-19 | Rhodius Schleifwerkzeuge Gmbh & Co. Kg | Resin-bonded cutting disc |
| CN109159040A (en) * | 2018-08-07 | 2019-01-08 | 安徽砥钻砂轮有限公司 | A kind of thin resin grinding wheel |
| CN109093533A (en) * | 2018-10-30 | 2018-12-28 | 河南格锐新材料科技有限公司 | A kind of cutting sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1481195A (en) * | 1973-10-16 | 1977-07-27 | Norton Co | Composite resinoid bonded abrasive wheels |
| CA1025672A (en) * | 1973-07-16 | 1978-02-07 | Norton Company | Bonded abrasive wheel containing garnet |
| US4848041A (en) * | 1987-11-23 | 1989-07-18 | Minnesota Mining And Manufacturing Company | Abrasive grains in the shape of platelets |
| US5129919A (en) * | 1990-05-02 | 1992-07-14 | Norton Company | Bonded abrasive products containing sintered sol gel alumina abrasive filaments |
| CN1265699A (en) * | 1997-08-01 | 2000-09-06 | 美国3M公司 | Abrasive articles comprising blend of abrasive particles |
| CN1511077A (en) * | 2001-05-25 | 2004-07-07 | 3M | Abrasive disc and fastener |
| WO2007147039A1 (en) * | 2006-06-15 | 2007-12-21 | 3M Innovative Properties Company | Abrasive disc |
| US7344573B2 (en) * | 2003-11-06 | 2008-03-18 | Saint-Gobain Abrasives Technology Company | Impregnation of grinding wheels using supercritical fluids |
-
2009
- 2009-02-27 CN CN200910046845.3A patent/CN101817171B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1025672A (en) * | 1973-07-16 | 1978-02-07 | Norton Company | Bonded abrasive wheel containing garnet |
| GB1481195A (en) * | 1973-10-16 | 1977-07-27 | Norton Co | Composite resinoid bonded abrasive wheels |
| US4848041A (en) * | 1987-11-23 | 1989-07-18 | Minnesota Mining And Manufacturing Company | Abrasive grains in the shape of platelets |
| US5129919A (en) * | 1990-05-02 | 1992-07-14 | Norton Company | Bonded abrasive products containing sintered sol gel alumina abrasive filaments |
| CN1265699A (en) * | 1997-08-01 | 2000-09-06 | 美国3M公司 | Abrasive articles comprising blend of abrasive particles |
| CN1511077A (en) * | 2001-05-25 | 2004-07-07 | 3M | Abrasive disc and fastener |
| US7344573B2 (en) * | 2003-11-06 | 2008-03-18 | Saint-Gobain Abrasives Technology Company | Impregnation of grinding wheels using supercritical fluids |
| WO2007147039A1 (en) * | 2006-06-15 | 2007-12-21 | 3M Innovative Properties Company | Abrasive disc |
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