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EP0836911A1 - Backup pad for a flexible grinding disc - Google Patents

Backup pad for a flexible grinding disc Download PDF

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Publication number
EP0836911A1
EP0836911A1 EP96202844A EP96202844A EP0836911A1 EP 0836911 A1 EP0836911 A1 EP 0836911A1 EP 96202844 A EP96202844 A EP 96202844A EP 96202844 A EP96202844 A EP 96202844A EP 0836911 A1 EP0836911 A1 EP 0836911A1
Authority
EP
European Patent Office
Prior art keywords
backup pad
support
disc
grinding disc
protrusions
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.)
Ceased
Application number
EP96202844A
Other languages
German (de)
French (fr)
Inventor
Sandro Giovanni Giuseppe Ferronato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP96202844A priority Critical patent/EP0836911A1/en
Publication of EP0836911A1 publication Critical patent/EP0836911A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/08—Circular back-plates for carrying flexible material

Definitions

  • the invention is related to a backup pad for supporting a flexible grinding disc, which pad comprises a hub which is to be connected to a rotary spindle, as well as a concentric support disc having a support face onto which the grinding disc is to be supported.
  • backup pad The purpose of such backup pad is to support the grinding disc. It should have a desired stiffness, so as to be able to press the grinding disc with the sufficient force against the object to be ground. Nevertheless, the backup pad should also be able to flex somewhat under the service loads excited thereon.
  • these superabrasive grinding discs generate a much higher temperature (e.g 200-250 degrees C).
  • the known backup pads are not resistant to such temperatures, and will melt and deform readily under such conditions. Subsequently, the superabrasive grinding disc will be damaged due to lack of support by the backup pad, entailing explosions or parts breaking away.
  • the object of the invention is to provide a backup pad which lacks these disadvantages.
  • This object is achieved in that the support disc is provided with ventilating holes which open out on the support face, for providing an air flow between the facing surfaces of support disc and grinding disc.
  • the backup pad according to the invention has in general the same strength and stiffness properties as the traditional backup pads. Because of the fact however that the backup-pad according to the invention is actively cooled by the air flow which is generated in service, the temperature thereof may be kept within acceptable limits, even under extreme loading conditions such a sustained grinding action under high pressure forces.
  • the supporting face of the support disc may be carried out with support protrusions for supporting the grinding disc, between which protrusions an airgap is available.
  • the support protrusions delimit channels through which the air flow may escape towards the outer edge of the discs.
  • protrusions are burl-shaped, nodular shaped, or cylindrically shaped.
  • the support protrusions may be covered with a layer of metal mesh material, which layer supports the grinding disc.
  • a layer of metal mesh material which layer supports the grinding disc.
  • propelling means may be provided for inducing an air flow through the ventilating holes.
  • These propelling means may simply take the form of obliquely shaped holes, which "scoop" the air and propel it through the openings and further through the above channels.
  • the propelling means comprise a fan with fan blades which are tangentially oriented with respect to the hub, and which rest against the support disc.
  • the ventilating holes may be situated between the fan blades.
  • Figure 1 shows a view in perspective, on one side of the backup pad.
  • Figure 2 shows a view in perspective, partly taken away, of the backup pad with grinding pad, from the other side.
  • the backup pad as shown in figure 1 comprises a disc 1 of plastic, which has an integrated hub 2 which can be connected to the shaft 3 (shown in dotted lines) of a grinding machine.
  • the other side of the backup pad is provided with a number of radially/tangentially oriented support ridges 4, on top of which a layer of mesh material 5 has been connected.
  • the plastic material 4 of the ridges may have been molten a little bit, such that it protrudes into the meshes of the mesh material 5.
  • the backup pad On the side shown in figure 1, the backup pad carries propelling means 6 carried out as a fan with six fan blades 7.
  • the backup pad has ventilating holes 8, which each on the one hand open out between a pair of fan blades 7, and which on the other side (see figure 2) open out within the circle described by the support ridges 4.
  • a grinding disc 9 is supported, carrying deposits 10 with highly abrasive material.
  • the grinding disc 9 is connected to the drive shaft 3 shown in figure 1.
  • the fan blades 7 of the propelling means 6 are brought in rotation, whereby they propel the environmental air through the ventilating holes 8, in between the backup pad 1 and the grinding disc 9: see the arrows 13.
  • an increased cooling effect for the grinding disc 9 is obtained.
  • the grinding disc 9 is supported firmly but also between the support ridges 4, by the mesh material 5 covering these ridges 4.
  • the grinding action of the grinding disc is not impaired by the air gap 12.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

A backup pad for supporting a flexible grinding disc, comprises a hub which is to be connected to a rotary spindle, as well as a concentric support disc having a support face onto which the grinding disc is to be supported. The support disc is provided with ventilating holes which open out on the supporting face, for providing an air flow between the facing surfaces of support disc and grinding disc. Also, the support face of the support disc is provided with support protrusions for supporting the grinding disc, between which protrusions (4) an air gap (12) is available.

Description

The invention is related to a backup pad for supporting a flexible grinding disc, which pad comprises a hub which is to be connected to a rotary spindle, as well as a concentric support disc having a support face onto which the grinding disc is to be supported.
The purpose of such backup pad is to support the grinding disc. It should have a desired stiffness, so as to be able to press the grinding disc with the sufficient force against the object to be ground. Nevertheless, the backup pad should also be able to flex somewhat under the service loads excited thereon.
In the case of conventional grinding discs based on silicon carbide or aluminium oxide, the state of the art backup pads behave satisfactorily. Problems arise however when superabrasive grinding discs are applied. The grinding surface thereof comprises diamond particles. Their cutting action is a few times higher than the cutting action of the traditional grinding discs.
As a result, these superabrasive grinding discs generate a much higher temperature (e.g 200-250 degrees C). The known backup pads are not resistant to such temperatures, and will melt and deform readily under such conditions. Subsequently, the superabrasive grinding disc will be damaged due to lack of support by the backup pad, entailing explosions or parts breaking away.
Even in cases where the traditional backup pads are not destroyed, they nevertheless become to soft due to the fact that they are made of plastics, rubber, polyurethan etc.
The object of the invention is to provide a backup pad which lacks these disadvantages. This object is achieved in that the support disc is provided with ventilating holes which open out on the support face, for providing an air flow between the facing surfaces of support disc and grinding disc.
The backup pad according to the invention has in general the same strength and stiffness properties as the traditional backup pads. Because of the fact however that the backup-pad according to the invention is actively cooled by the air flow which is generated in service, the temperature thereof may be kept within acceptable limits, even under extreme loading conditions such a sustained grinding action under high pressure forces.
The supporting face of the support disc may be carried out with support protrusions for supporting the grinding disc, between which protrusions an airgap is available. The support protrusions delimit channels through which the air flow may escape towards the outer edge of the discs.
An excellent cooling effect is also obtained in case the protrusions are are burl-shaped, nodular shaped, or cylindrically shaped.
Furthermore, the support protrusions may be covered with a layer of metal mesh material, which layer supports the grinding disc. In this embodiment, sagging of the flexible disc between the protrusions, which sagging would render the grinding surface partly inoperative, can be avoided.
According to the invention, propelling means may be provided for inducing an air flow through the ventilating holes. These propelling means may simply take the form of obliquely shaped holes, which "scoop" the air and propel it through the openings and further through the above channels.
In a preferred embodiment, the propelling means comprise a fan with fan blades which are tangentially oriented with respect to the hub, and which rest against the support disc. The ventilating holes may be situated between the fan blades.
The backup pad according to the invention will be described further with reference to the following figures.
Figure 1 shows a view in perspective, on one side of the backup pad.
Figure 2 shows a view in perspective, partly taken away, of the backup pad with grinding pad, from the other side.
The backup pad as shown in figure 1 comprises a disc 1 of plastic, which has an integrated hub 2 which can be connected to the shaft 3 (shown in dotted lines) of a grinding machine.
As shown in figure, the other side of the backup pad is provided with a number of radially/tangentially oriented support ridges 4, on top of which a layer of mesh material 5 has been connected. For instance, the plastic material 4 of the ridges may have been molten a little bit, such that it protrudes into the meshes of the mesh material 5.
On the side shown in figure 1, the backup pad carries propelling means 6 carried out as a fan with six fan blades 7.
Moreover, the backup pad has ventilating holes 8, which each on the one hand open out between a pair of fan blades 7, and which on the other side (see figure 2) open out within the circle described by the support ridges 4.
On top of the side shown in figure 2, in particular on top of the supporting mesh material 5, a grinding disc 9 is supported, carrying deposits 10 with highly abrasive material.
By means of connecting nut 11 (shown in dotted lines), the grinding disc 9 is connected to the drive shaft 3 shown in figure 1.
Due to the fact that the grinding disc 9 lies on top of the mesh material 5 and the support ridges 4, an air gap 12 is maintained between the backup pad 1 and the grinding disc 9.
In service, the fan blades 7 of the propelling means 6 are brought in rotation, whereby they propel the environmental air through the ventilating holes 8, in between the backup pad 1 and the grinding disc 9: see the arrows 13. Thereby, an increased cooling effect for the grinding disc 9 is obtained. Moreover, the grinding disc 9 is supported firmly but also between the support ridges 4, by the mesh material 5 covering these ridges 4. Thus, the grinding action of the grinding disc is not impaired by the air gap 12.

Claims (10)

  1. Backup pad for supporting a flexible grinding disc (9), which pad comprises a hub (2) which is to be connected to a rotary spindle (3), as well as a concentric support disc (1) having a support face onto which the grinding disc (9) is to be supported, characterised in that the support disc (1) is provided with ventilating holes (8) which open out on the supporting face, for providing an air flow between the facing surfaces of support disc (1) and grinding disc (9).
  2. Backup pad according to claim 1, wherein the support face of the support disc (1) is provided with support protrusions (4) for supporting the grinding disc (9), between which protrusions (4) an air gap (12) is available.
  3. Backup pad according to claim 2, wherein the support protrusions (4) are covered by a layer of metal mesh material (5), which layer (5) supports the grinding disc (9).
  4. Backup pad according to claim 2 or 3, wherein the protrusions (4) are generally radially oriented.
  5. Backup pad according to claim 2 or 3, wherein the protrusions are burl-shaped, nodular shaped, or cylindrically shaped.
  6. Claim according to claim 5, wherein the protrusions have a diameter of 1 to 4 mm.
  7. Backup pad according to any of the preceding claims, wherein propelling means (6, 7) are provided for inducing an air flow through the ventilating holes (8).
  8. Backup pad according to claim 7, wherein the propelling means (6) comprise a fan with fan blades (7) which are tangentially oriented with respect to the hub (2), and which rest against or are connected to the support disc (1).
  9. Backup pad according to claim 8, wherein the ventilating holes (8) are situated between the fan blades (7).
  10. Backup pad according to claim 8 or 9, wherein the fan blades (7) are covered by a cover disc at their side facing away from the support disc (1).
EP96202844A 1996-10-11 1996-10-11 Backup pad for a flexible grinding disc Ceased EP0836911A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP96202844A EP0836911A1 (en) 1996-10-11 1996-10-11 Backup pad for a flexible grinding disc

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP96202844A EP0836911A1 (en) 1996-10-11 1996-10-11 Backup pad for a flexible grinding disc

Publications (1)

Publication Number Publication Date
EP0836911A1 true EP0836911A1 (en) 1998-04-22

Family

ID=8224489

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96202844A Ceased EP0836911A1 (en) 1996-10-11 1996-10-11 Backup pad for a flexible grinding disc

Country Status (1)

Country Link
EP (1) EP0836911A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005010876A1 (en) * 2005-03-09 2006-09-14 Ejot Schweiz Ag Circular grinding disc has rear face with ribbed air intake ducts discharging through outlets
ES2313859A1 (en) * 2008-08-08 2009-03-01 Jose Maria Mastro Sieiro Tool for surface treatment (Machine-translation by Google Translate, not legally binding)
JP2015071217A (en) * 2013-10-04 2015-04-16 スリーエム イノベイティブ プロパティズ カンパニー Pad to support the abrasive disc
EP2913150A3 (en) * 2014-02-28 2015-10-28 Adolf Würth GmbH & Co. KG Polishing device with heat dissipation device
US20160184973A1 (en) * 2013-07-05 2016-06-30 Flex-Elektrowerkzeuge Gmbh Tool holder and handheld abrading machine
US9931734B2 (en) 2015-01-20 2018-04-03 Htc Sweden Ab Carrier disk, system comprising such carrier disk and floor grinding machine
JP2021049599A (en) * 2019-09-25 2021-04-01 株式会社マルテー大塚 Disk pad for grinder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599952A (en) * 1951-06-04 1952-06-10 Strayer Wilfred Grinding wheel blower
US3187475A (en) * 1963-02-18 1965-06-08 Edward J Sopcak Backing disc for abrasive sheet
US3754359A (en) * 1970-09-16 1973-08-28 Spam D Avray Abrasion tools
WO1993008955A1 (en) * 1991-11-02 1993-05-13 Fabritius Hans Josef Machining disc arrangement
FR2701417A1 (en) * 1993-02-15 1994-08-19 Cifap Sa Rotary abrasive tool including cooling means

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2599952A (en) * 1951-06-04 1952-06-10 Strayer Wilfred Grinding wheel blower
US3187475A (en) * 1963-02-18 1965-06-08 Edward J Sopcak Backing disc for abrasive sheet
US3754359A (en) * 1970-09-16 1973-08-28 Spam D Avray Abrasion tools
WO1993008955A1 (en) * 1991-11-02 1993-05-13 Fabritius Hans Josef Machining disc arrangement
FR2701417A1 (en) * 1993-02-15 1994-08-19 Cifap Sa Rotary abrasive tool including cooling means

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005010876A1 (en) * 2005-03-09 2006-09-14 Ejot Schweiz Ag Circular grinding disc has rear face with ribbed air intake ducts discharging through outlets
ES2313859A1 (en) * 2008-08-08 2009-03-01 Jose Maria Mastro Sieiro Tool for surface treatment (Machine-translation by Google Translate, not legally binding)
ES2313859B1 (en) * 2008-08-08 2010-03-17 Jose Maria Castro Sieiro TOOL FOR SURFACE TREATMENT.
US20160184973A1 (en) * 2013-07-05 2016-06-30 Flex-Elektrowerkzeuge Gmbh Tool holder and handheld abrading machine
US9718169B2 (en) * 2013-07-05 2017-08-01 Flex-Elektrowerkzeuge Gmbh Tool holder and handheld abrading machine
JP2015071217A (en) * 2013-10-04 2015-04-16 スリーエム イノベイティブ プロパティズ カンパニー Pad to support the abrasive disc
EP2913150A3 (en) * 2014-02-28 2015-10-28 Adolf Würth GmbH & Co. KG Polishing device with heat dissipation device
US9931734B2 (en) 2015-01-20 2018-04-03 Htc Sweden Ab Carrier disk, system comprising such carrier disk and floor grinding machine
CN110497272A (en) * 2015-01-20 2019-11-26 胡斯华纳有限公司 Branch attic base
CN110497272B (en) * 2015-01-20 2021-05-07 胡斯华纳有限公司 Support plate
JP2021049599A (en) * 2019-09-25 2021-04-01 株式会社マルテー大塚 Disk pad for grinder

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