CA3107230A1 - Grinding device - Google Patents
Grinding device Download PDFInfo
- Publication number
- CA3107230A1 CA3107230A1 CA3107230A CA3107230A CA3107230A1 CA 3107230 A1 CA3107230 A1 CA 3107230A1 CA 3107230 A CA3107230 A CA 3107230A CA 3107230 A CA3107230 A CA 3107230A CA 3107230 A1 CA3107230 A1 CA 3107230A1
- Authority
- CA
- Canada
- Prior art keywords
- grinding
- support element
- carrier
- grinding means
- grinding device
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
- B24B21/004—Machines or devices using grinding or polishing belts; Accessories therefor using abrasive rolled strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
- B24D15/02—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface
- B24D15/023—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface using in exchangeable arrangement a layer of flexible material
- B24D15/026—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface using in exchangeable arrangement a layer of flexible material able to be stripped-off from a built-in delivery spool
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The invention relates to a grinding device, comprising a support element (3) and a preferably flexible grinding means (5) held thereon, which has a carrier resting against the support element (3), and a grinding layer designed in such a way that in a grinding position, the grinding means (5) is held on the support element (3) in a frictionally locking manner.
Description
Grinding device The invention relates to a grinding device according to the preamble of claim 1, and to a grinding means.
Such grinding devices consist of a shape-stable support element which may be in the form of a support disc or in the form of a grinding block, the latter in the case of manual use.
The grinding means is in the form of a flexible grinding sheet or a grinding belt, which is held on the support element by means of a hook-and-loop connection, for which purpose the support element/grinding means pairing has suitably designed hook-and-loop layers.
In the case of the grinding means, this is provided on the side of a carrier that is located opposite a grinding layer, which consists of an abrasive grit, it being possible for the carrier to be made of paper, film, fabric, or a combination thereof.
In addition to this hook-and-loop connection, which establishes a form fit, it is proposed in DE 10 2017 108 191, which was not previously published, to hold the grinding means on the support element, i.e. a support disc, by means of a material bond, by means of a form fit or by frictional engagement, the frictional engagement being established by sucking the grinding means onto the support disc.
The material bond takes place by adhesion, wherein the contact surface of the carrier that makes contact with the support disc is equipped with a self-adhesive layer.
However, the known connections of the grinding means to the support element are disadvantageous in some respects, in particular with regard to handling, but also with regard to relatively cost-intensive production.
Date Recue/Date Received 2021-01-21
Such grinding devices consist of a shape-stable support element which may be in the form of a support disc or in the form of a grinding block, the latter in the case of manual use.
The grinding means is in the form of a flexible grinding sheet or a grinding belt, which is held on the support element by means of a hook-and-loop connection, for which purpose the support element/grinding means pairing has suitably designed hook-and-loop layers.
In the case of the grinding means, this is provided on the side of a carrier that is located opposite a grinding layer, which consists of an abrasive grit, it being possible for the carrier to be made of paper, film, fabric, or a combination thereof.
In addition to this hook-and-loop connection, which establishes a form fit, it is proposed in DE 10 2017 108 191, which was not previously published, to hold the grinding means on the support element, i.e. a support disc, by means of a material bond, by means of a form fit or by frictional engagement, the frictional engagement being established by sucking the grinding means onto the support disc.
The material bond takes place by adhesion, wherein the contact surface of the carrier that makes contact with the support disc is equipped with a self-adhesive layer.
However, the known connections of the grinding means to the support element are disadvantageous in some respects, in particular with regard to handling, but also with regard to relatively cost-intensive production.
Date Recue/Date Received 2021-01-21
2 For instance, the construction of the carrier for providing the hook-and-loop or self-adhesive layer is cost-intensive, in particular since such a layer has to be formed in multiple stages. In addition, they are subject to a relatively high degree of wear due to the connection being made and released.
The holding of the grinding means on the support element by means of vacuum requires special measures with regard to the air permeability and sealing. This means that the support disc must have apertures, through which air is sucked in order to hold the grinding means thereon.
The handling when equipping the grinding device with grinding means is also sometimes quite awkward and stands in the way of optimized use, in particular with regard to changeover times.
This applies equally to a grinding device as discussed in DE 10 2010 001 769 Al, in which frictional engagement between the support element and the grinding means is achieved in that the support element is provided with bristles on the side thereof facing towards the grinding means, which bristles engage in a necessarily porous surface of the carrier.
The disadvantage with this is that the carrier is permeable, as a result of which grinding dust enters the area of connection to the support element, which leads to considerable problems as the operating time increases.
US 3 345 785 A discloses a grinding device with the suggestion of a frictional connection between a flexible support element and a grinding means, wherein the friction fit is established between a peripheral flange of the grinding means and the support element.
The problem addressed by the invention is that of further developing a grinding device and a grinding means of the generic type in such a way that it can be produced more easily and cost-effectively and it is easier to handle.
Date Recue/Date Received 2021-01-21
The holding of the grinding means on the support element by means of vacuum requires special measures with regard to the air permeability and sealing. This means that the support disc must have apertures, through which air is sucked in order to hold the grinding means thereon.
The handling when equipping the grinding device with grinding means is also sometimes quite awkward and stands in the way of optimized use, in particular with regard to changeover times.
This applies equally to a grinding device as discussed in DE 10 2010 001 769 Al, in which frictional engagement between the support element and the grinding means is achieved in that the support element is provided with bristles on the side thereof facing towards the grinding means, which bristles engage in a necessarily porous surface of the carrier.
The disadvantage with this is that the carrier is permeable, as a result of which grinding dust enters the area of connection to the support element, which leads to considerable problems as the operating time increases.
US 3 345 785 A discloses a grinding device with the suggestion of a frictional connection between a flexible support element and a grinding means, wherein the friction fit is established between a peripheral flange of the grinding means and the support element.
The problem addressed by the invention is that of further developing a grinding device and a grinding means of the generic type in such a way that it can be produced more easily and cost-effectively and it is easier to handle.
Date Recue/Date Received 2021-01-21
3 This problem is solved by a grinding device having the features of claim 1.
Firstly, it is crucial that the coefficient of friction between the support element and the grinding means, which is held thereon across the entire surface, is sufficient to absorb the longitudinal and transverse forces that occur during grinding, wherein according to the invention the coefficient of friction of the pairing is between 0.2 and 0.5.
As has been found, such a coefficient of friction is sufficient in particular when grinding a finished surface at certain points, wherein the friction force between the support disc and the grinding means is generated by pressure when the grinding device, i.e. the support element and the grinding means, is pressed onto the surface to be treated. This friction force is preferably between 0.5 to 2.0 N/mm2.
As long as the friction force is greater than the counterforce produced by the grinding process, mutual displacement of the support element and grinding means is prevented. Given the appropriate coefficient of friction of the pairing, grinding across a surface is possible without any problem, wherein the grinding means is designed to be flexible in the same way as in the case of point grinding.
The grinding means, which may be in the form of a single sheet or a grinding belt, consists of a carrier and a grinding layer held thereon. While the carrier, which forms a contact layer to the support element, is constructed in multiple stages in the prior art and is designed in particular for a hook-and-loop or adhesive connection, the carrier according to the invention is produced as a single layer made of a suitable plastic, which should be both elastic and flexible.
Polymers, elastomers or leathers are particularly suitable for this, the thickness of the carrier being between 0.7 and 4 mm.
Date Recue/Date Received 2021-01-21
Firstly, it is crucial that the coefficient of friction between the support element and the grinding means, which is held thereon across the entire surface, is sufficient to absorb the longitudinal and transverse forces that occur during grinding, wherein according to the invention the coefficient of friction of the pairing is between 0.2 and 0.5.
As has been found, such a coefficient of friction is sufficient in particular when grinding a finished surface at certain points, wherein the friction force between the support disc and the grinding means is generated by pressure when the grinding device, i.e. the support element and the grinding means, is pressed onto the surface to be treated. This friction force is preferably between 0.5 to 2.0 N/mm2.
As long as the friction force is greater than the counterforce produced by the grinding process, mutual displacement of the support element and grinding means is prevented. Given the appropriate coefficient of friction of the pairing, grinding across a surface is possible without any problem, wherein the grinding means is designed to be flexible in the same way as in the case of point grinding.
The grinding means, which may be in the form of a single sheet or a grinding belt, consists of a carrier and a grinding layer held thereon. While the carrier, which forms a contact layer to the support element, is constructed in multiple stages in the prior art and is designed in particular for a hook-and-loop or adhesive connection, the carrier according to the invention is produced as a single layer made of a suitable plastic, which should be both elastic and flexible.
Polymers, elastomers or leathers are particularly suitable for this, the thickness of the carrier being between 0.7 and 4 mm.
Date Recue/Date Received 2021-01-21
4 As mentioned, due to the flexible and elastic nature of the carrier, the grinding of both flat and curved surfaces is possible, the curved surfaces being convex or concave.
As has surprisingly been found, the frictional connection between the support element and the grinding means is particularly advantageous when the grinding means is in web form. Since the grinding belt is precisely aligned and guided in the area of connection to the support element, problem-free positioning between the support element and the grinding sheet is ensured.
The grinding belt is lifted off for moving the support element to the next position, or the grinding belt slides away from the support disc when the lifting or tearing force with which the grinding belt is detached from the support element is greater than the friction force between the support element and the grinding belt.
In a manner known per se, the grinding itself takes place, as mentioned, at certain points or across a surface, using orbital, rotating or vibrating movements.
Instead of the aforementioned one-piece construction of the carrier, there is also the possibility of multi-piece construction. By way of example, the carrier which carries the grinding means may be made of paper, while the contact surface which bears against the support element is made of an elastomeric, rubber-like or leather material.
Particularly if the surface of the carrier is smooth, for example in the form of a film, the surface assigned to the support element is slightly structured and is likewise formed of an elastomeric, rubber-like or leather material.
The rough surface of the carrier formed of a fabric is slightly structured on the side held by frictional engagement on the Date Recue/Date Received 2021-01-21 support element and is possibly formed of a foam. For the pairings mentioned, additional anti-slip means are not absolutely necessary.
In any case, account should be taken of the fact that the surfaces may be dry, moist or wet, with a corresponding effect on the friction pairs.
Further advantageous embodiments of the invention are characterized in the dependent claims.
One exemplary embodiment of the invention will be described below with reference to the accompanying drawing.
The single figure shows a grinding device according to the invention in a schematic side view.
The figure shows a grinding device 1 for removing a flaw in a surface, in particular a finished surface, of an object (not shown) by grinding.
This grinding device 1 has a robot arm 2 and a support element 3 held thereon in the form of a support disc, which support element is movable, for example in an orbital, vibrating or rotating manner, relative to the surface in order to grind the flaw.
In the grinding position, i.e. in contact with the surface of the object, as shown in the figure, a grinding means 5, in the example in the form of a grinding belt, bears with frictional engagement against the support element 3, wherein the rear side of the grinding means 5, so to speak, which bears against the support element 3, is designed as a carrier which on the other side carries an abrasive grit that makes contact with the surface of the object.
The grinding means 5 is held in a dispenser in the form of a cassette 4 and is wound as a roll 6 on an unwinding shaft 7, and Date Recue/Date Received 2021-01-21 is wound onto a winding shaft 8, preferably in cycles, in a manner corresponding to the grinding process.
The frictional engagement between the support element 3 and the grinding means 5 is released by lifting the support element 3, so that the grinding means 5 can be advanced without hindrance.
Date Recue/Date Received 2021-01-21
As has surprisingly been found, the frictional connection between the support element and the grinding means is particularly advantageous when the grinding means is in web form. Since the grinding belt is precisely aligned and guided in the area of connection to the support element, problem-free positioning between the support element and the grinding sheet is ensured.
The grinding belt is lifted off for moving the support element to the next position, or the grinding belt slides away from the support disc when the lifting or tearing force with which the grinding belt is detached from the support element is greater than the friction force between the support element and the grinding belt.
In a manner known per se, the grinding itself takes place, as mentioned, at certain points or across a surface, using orbital, rotating or vibrating movements.
Instead of the aforementioned one-piece construction of the carrier, there is also the possibility of multi-piece construction. By way of example, the carrier which carries the grinding means may be made of paper, while the contact surface which bears against the support element is made of an elastomeric, rubber-like or leather material.
Particularly if the surface of the carrier is smooth, for example in the form of a film, the surface assigned to the support element is slightly structured and is likewise formed of an elastomeric, rubber-like or leather material.
The rough surface of the carrier formed of a fabric is slightly structured on the side held by frictional engagement on the Date Recue/Date Received 2021-01-21 support element and is possibly formed of a foam. For the pairings mentioned, additional anti-slip means are not absolutely necessary.
In any case, account should be taken of the fact that the surfaces may be dry, moist or wet, with a corresponding effect on the friction pairs.
Further advantageous embodiments of the invention are characterized in the dependent claims.
One exemplary embodiment of the invention will be described below with reference to the accompanying drawing.
The single figure shows a grinding device according to the invention in a schematic side view.
The figure shows a grinding device 1 for removing a flaw in a surface, in particular a finished surface, of an object (not shown) by grinding.
This grinding device 1 has a robot arm 2 and a support element 3 held thereon in the form of a support disc, which support element is movable, for example in an orbital, vibrating or rotating manner, relative to the surface in order to grind the flaw.
In the grinding position, i.e. in contact with the surface of the object, as shown in the figure, a grinding means 5, in the example in the form of a grinding belt, bears with frictional engagement against the support element 3, wherein the rear side of the grinding means 5, so to speak, which bears against the support element 3, is designed as a carrier which on the other side carries an abrasive grit that makes contact with the surface of the object.
The grinding means 5 is held in a dispenser in the form of a cassette 4 and is wound as a roll 6 on an unwinding shaft 7, and Date Recue/Date Received 2021-01-21 is wound onto a winding shaft 8, preferably in cycles, in a manner corresponding to the grinding process.
The frictional engagement between the support element 3 and the grinding means 5 is released by lifting the support element 3, so that the grinding means 5 can be advanced without hindrance.
Date Recue/Date Received 2021-01-21
Claims (6)
1. Grinding device comprising a support element (3) and a preferably flexible grinding means (5) held thereon, said grinding means consisting of a carrier, which bears against a closed surface of the support element (3), and a grinding layer, characterized in that the grinding means (5), the surface of the carrier of which facing towards the support element (3) is structured, is held against the support element (3) by frictional engagement across the entire surface in the grinding position, wherein the coefficient of friction of the support element (3)/grinding means (5) pairing is between 0.2 and 0.5.
2. Grinding device according to claim 1, characterized in that the friction force generated by pressing the support element (3) against the grinding means (5) is between 0.5 to 2.0 N/mm2.
3. Grinding device according to claim 1 or 2, characterized in that the side of the carrier facing towards the support element (3) is made of a polymer, of an elastomer or of leather.
4. Grinding device according to any one of the preceding claims, characterized in that the thickness of the carrier on the side facing towards the support element (3) is between 0.7 and 4 mm.
5. Grinding device according to any one of the preceding claims, characterized in that the surface of the carrier facing towards the support element (3) is made of a foam.
6. Grinding device according to any one of the preceding claims, characterized in that the grinding means (5) is designed as a grinding belt.
Date Regue/Date Received 2021-01-21
Date Regue/Date Received 2021-01-21
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018121625.4 | 2018-09-05 | ||
| DE102018121625.4A DE102018121625A1 (en) | 2018-09-05 | 2018-09-05 | Grinding device |
| PCT/EP2019/073205 WO2020048886A1 (en) | 2018-09-05 | 2019-08-30 | Grinding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3107230A1 true CA3107230A1 (en) | 2020-03-12 |
Family
ID=67810609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3107230A Pending CA3107230A1 (en) | 2018-09-05 | 2019-08-30 | Grinding device |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20210316419A1 (en) |
| EP (1) | EP3846966B1 (en) |
| JP (1) | JP2021534993A (en) |
| KR (1) | KR20210042990A (en) |
| CN (1) | CN112752631B (en) |
| BR (1) | BR112021000891A2 (en) |
| CA (1) | CA3107230A1 (en) |
| DE (1) | DE102018121625A1 (en) |
| ES (1) | ES2968470T3 (en) |
| MX (1) | MX2021002576A (en) |
| WO (1) | WO2020048886A1 (en) |
| ZA (1) | ZA202100300B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102017108191A1 (en) * | 2017-04-18 | 2018-10-18 | Rud. Starcke Gmbh & Co. Kg | Method for partially grinding a surface and grinding device |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2258733A (en) * | 1940-08-30 | 1941-10-14 | Gen Motors Corp | Sanding machine |
| US2309819A (en) * | 1941-04-18 | 1943-02-02 | Carborundum Co | Art of grinding and polishing glass and apparatus therefor |
| US3345785A (en) * | 1964-12-07 | 1967-10-10 | Warren N Riker | Sanding disc assembly |
| US3498010A (en) * | 1965-06-03 | 1970-03-03 | Nobuyoshi Hagihara | Flexible grinding disc |
| DE1973875U (en) * | 1965-12-31 | 1967-11-30 | Franz Josefy | BELT SANDING MACHINE. |
| US4010583A (en) * | 1974-05-28 | 1977-03-08 | Engelhard Minerals & Chemicals Corporation | Fixed-super-abrasive tool and method of manufacture thereof |
| DE3642086A1 (en) * | 1986-12-10 | 1988-06-23 | Fraunhofer Ges Forschung | Grinding device |
| US5109638A (en) * | 1989-03-13 | 1992-05-05 | Microsurface Finishing Products, Inc. | Abrasive sheet material with non-slip backing |
| EP0619165A1 (en) * | 1993-04-07 | 1994-10-12 | Minnesota Mining And Manufacturing Company | Abrasive article |
| DE19632809C2 (en) * | 1996-08-14 | 2002-06-20 | Infineon Technologies Ag | Device for chemical mechanical polishing of wafers |
| FR2758285B3 (en) * | 1997-01-13 | 1998-12-04 | Struers As | METHOD OF FIXING AN ABRASIVE OR POLISHING AGENT, IN THE FORM OF A SHEET, ON A MAGNETIC SUPPORT |
| US5967882A (en) * | 1997-03-06 | 1999-10-19 | Keltech Engineering | Lapping apparatus and process with two opposed lapping platens |
| HU219837B (en) * | 1997-10-29 | 2001-08-28 | József Mandzsú | Flat tool with quick coupling element and quick coupling system |
| US6634929B1 (en) * | 1999-04-23 | 2003-10-21 | 3M Innovative Properties Company | Method for grinding glass |
| US6685539B1 (en) * | 1999-08-24 | 2004-02-03 | Ricoh Company, Ltd. | Processing tool, method of producing tool, processing method and processing apparatus |
| US20010031612A1 (en) * | 2000-01-06 | 2001-10-18 | Scott Diane B. | Retention of a polishing pad on a platen |
| US7520800B2 (en) * | 2003-04-16 | 2009-04-21 | Duescher Wayne O | Raised island abrasive, lapping apparatus and method of use |
| CN101808781B (en) * | 2007-08-03 | 2014-10-22 | 圣戈班磨料磨具有限公司 | Abrasive article with adhesion promoting layer |
| DE102010001769A1 (en) * | 2010-02-10 | 2011-08-11 | JÖST GmbH, 69483 | Grinding and cleaning body |
| EP2776210B1 (en) * | 2011-11-09 | 2017-01-18 | 3M Innovative Properties Company | Composite abrasive wheel |
| TWI548481B (en) * | 2014-11-17 | 2016-09-11 | 三芳化學工業股份有限公司 | Polishing pad and method for making the same |
| DE102017108191A1 (en) * | 2017-04-18 | 2018-10-18 | Rud. Starcke Gmbh & Co. Kg | Method for partially grinding a surface and grinding device |
-
2018
- 2018-09-05 DE DE102018121625.4A patent/DE102018121625A1/en active Pending
-
2019
- 2019-08-30 CN CN201980057639.4A patent/CN112752631B/en active Active
- 2019-08-30 EP EP19762134.5A patent/EP3846966B1/en active Active
- 2019-08-30 CA CA3107230A patent/CA3107230A1/en active Pending
- 2019-08-30 ES ES19762134T patent/ES2968470T3/en active Active
- 2019-08-30 BR BR112021000891-8A patent/BR112021000891A2/en unknown
- 2019-08-30 US US17/273,529 patent/US20210316419A1/en active Pending
- 2019-08-30 KR KR1020217009243A patent/KR20210042990A/en unknown
- 2019-08-30 JP JP2021512536A patent/JP2021534993A/en active Pending
- 2019-08-30 WO PCT/EP2019/073205 patent/WO2020048886A1/en active Application Filing
- 2019-08-30 MX MX2021002576A patent/MX2021002576A/en unknown
-
2021
- 2021-01-15 ZA ZA2021/00300A patent/ZA202100300B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP3846966A1 (en) | 2021-07-14 |
| CN112752631A (en) | 2021-05-04 |
| ZA202100300B (en) | 2022-05-25 |
| ES2968470T3 (en) | 2024-05-09 |
| CN112752631B (en) | 2023-02-17 |
| DE102018121625A1 (en) | 2020-03-05 |
| KR20210042990A (en) | 2021-04-20 |
| BR112021000891A2 (en) | 2021-04-13 |
| MX2021002576A (en) | 2021-05-12 |
| EP3846966B1 (en) | 2023-10-18 |
| WO2020048886A1 (en) | 2020-03-12 |
| JP2021534993A (en) | 2021-12-16 |
| US20210316419A1 (en) | 2021-10-14 |
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