EP0812250B1 - Flexible abrasive member with permanent one way mould and method of making same - Google Patents

Flexible abrasive member with permanent one way mould and method of making same Download PDF

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Publication number
EP0812250B1
EP0812250B1 EP95909134A EP95909134A EP0812250B1 EP 0812250 B1 EP0812250 B1 EP 0812250B1 EP 95909134 A EP95909134 A EP 95909134A EP 95909134 A EP95909134 A EP 95909134A EP 0812250 B1 EP0812250 B1 EP 0812250B1
Authority
EP
European Patent Office
Prior art keywords
mould
abrasive member
flexible abrasive
primary
fill
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.)
Expired - Lifetime
Application number
EP95909134A
Other languages
German (de)
French (fr)
Other versions
EP0812250A1 (en
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
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Individual
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Filing date
Publication date
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Publication of EP0812250A1 publication Critical patent/EP0812250A1/en
Application granted granted Critical
Publication of EP0812250B1 publication Critical patent/EP0812250B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B24D7/063—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with segments embedded in a matrix which is rubbed away during the grinding process
    • 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
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/22—Rubbers synthetic or natural
    • B24D3/26—Rubbers synthetic or natural for porous or cellular structure

Definitions

  • the invention relates to a flexible abrasive member comprising a backing layer to which at one side an attachment is mounted and to which at another side deposits are adhered consisting of abrasive particles and bonding material such as a resin.
  • abrasive members are used for coarsegrinding or polishing hard materials like stone, glass, concrete and ceramic by example.
  • abrasive members by using moulds in which resin or other bonding materials, comprising abrasive particles, are being poured or sintered.
  • moulds may be made of metal or synthetic material.
  • these abrasive particles may be diamond particles.
  • the moulding techniques known in the art comprise at least one mould suited for either multiple use or one time use. In case of one time use the mould is lost and does not fulfill any function in the method of making the abrasive member anymore, nor in the performance of the abrasive member itself. Losing this mould causes this moulding technique to be expensive, especially in case of mass production of the abrasive members.
  • moulds suited for multiple use are being used, these moulds must be made of hard-wearing material such as hardmetal. Both applying such expensive material and forming the mould cause this moulding technique to be expensive, although typically suited for applying in mass production techniques. Moreover, such these moulds are suited for only one product form. Slight or great alterations concerning product form result in the need for new moulds.
  • EP-A-0 147 633 discloses a flexible abrasive member comprising a backing layer to which at one side an attachment is mounted and to which at the other side a permanent one way mould is attached in which deposits are embedded consisting of abrasive particles and bonding material, whereby the mould extends along the height of said deposits.
  • One object of the invention is to provide a flexible abrasive member produced by a moulding technique much cheaper and faster to operate than moulding techniques known in the art, used for making flexible abrasive members.
  • a typical advantage of the present invention is the possibility to produce moulds of any simple or complex shape much cheaper and easier than in the known methods.
  • the mould as well as the deposits may be made of any ceramic, metal, resin or synthetic material as well as graphite, glass, quartz or sand.
  • the mould comprises a through hole substantially in the middle of the mould.
  • this hole forms the area not suited for abrading purposes when applying rotating abrasive members where the axis of the hole is the axis of rotation.
  • This through hole may also be present in the backing layer and the attachment. This hole may be provided for several purposes. By example, an axle may be put through or coolant may be supplied through.
  • the mould may be made of a synthetic material.
  • this material is a flexible foam material, such as "Plastozote" made by the British Petroleum corporation in sheetform from 1-50 mm thickness.
  • the flexibility of the abrasive member is for a great deal determined by the flexibility of the mould.
  • Particularly flexible abrasive members are required when grinding or polishing curved shapes, as in the case of optical lenses and complex shaped products as a body out of stone or marble.
  • the synthetic material can be a spongetype foam holding water or coolant. This presents the advantage that water or other type of coolant is no longer needed for cooling purposes at the machine when applying the abrasive member.
  • the invention relates not only to the abrasive members such as herein referred to and described, but also to the method whereby such resulted. abrasive members are produced or from which these abrasive members
  • moulding After moulding the mould is permanently present on the product, supports the deposits and conducts heat away.
  • This moulding technique is much cheaper and faster to operate than moulding techniques known in the art, used for making flexible abrasive members, specifically because the mould is not lost, after moulding the mould has a function in the product making other arrangements for the same purpose redundant, and after moulding the mould does not have to be taken away, cleaned, greased and prepared for the following sequence.
  • the method of making the flexible abrasive member may comprise the step of applying heatshrinkage in or after one of the steps mentioned above, for the mould to obtain a desired thickness.
  • heatshrinkage not only the thickness of the mould can be adjusted, the openings present in the mould material can be adjusted also. The latter influences the flexibility of the mould and the capacity for containing water or other type of coolant.
  • the method of making the flexible abrasive member may comprise the steps of:
  • the method of making the flexible abrasive member may comprise the step adhering the fill-in mould to the surface of said primary mould.
  • the method of making the flexible abrasive member may comprise the step of applying heatshrinkage in or after one of the steps mentioned above, for the fill-in mould to obtain a desired thickness.
  • heatshrinkage not only the thickness of the fill-in mould can be adjusted, the openings present in the fill-in mould material can be adjusted also. The latter influences the flexibility of the mould and the capacity for containing water or other type of coolant.
  • the external shape of the fill-in mould and one or more openings corresponding to the openings in the primary mould are provided by punching or cutting a sheet material.
  • the fill-in mould may be positioned on top of the surface of said primary mould prior to punching or cutting the external shape of the mould and/or the openings corresponding to the openings in said primary mould.
  • a flexible abrasive member 1 embodying the invention comprising a backing layer 2 to which at one side 3 an attachment 4 is mounted and to which at the other side 5 deposits 6 are adhered consisting of abrasive particles 7 and bonding material 8 such as a resin, and a permanent one way primary mould 9 attached to said other side 5 of the backing layer 2 substantially encircling the deposits 6.
  • the permanent one way mould 9 extends all along the height of the deposits 6.
  • a fill-in mould 13 has been provided on top of the surface of the primary mould 9.
  • the fill-in mould 13 extends along the rest of the height of the deposits 6, which height is not being convered by the primary mould 9.
  • the fill-in mould 13 has a particularly desired external shape and one or more openings corresponding to the openings 12 of the primary mould 9.
  • FIG 2 a flexible abrasive member 1 is shown having a permanent one way mould 9 extending along part of the height of the deposits 6.
  • the flexible abrasive member 1 comprises a through hole 10, 11 substantially in the centre of the member 1 through the permanent one way mould 9 and through the backing layer 2 and the attachment 4 respectively.
  • the through hole 10, 11 may be absent or may be a blind hole not extending all through the height of the member 1.

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

Description

The invention relates to a flexible abrasive member comprising a backing layer to which at one side an attachment is mounted and to which at another side deposits are adhered consisting of abrasive particles and bonding material such as a resin. Such abrasive members are used for coarsegrinding or polishing hard materials like stone, glass, concrete and ceramic by example.
It is known in the art to produce such abrasive members by using moulds in which resin or other bonding materials, comprising abrasive particles, are being poured or sintered. These moulds may be made of metal or synthetic material. Preferably, these abrasive particles may be diamond particles.
The moulding techniques known in the art comprise at least one mould suited for either multiple use or one time use. In case of one time use the mould is lost and does not fulfill any function in the method of making the abrasive member anymore, nor in the performance of the abrasive member itself. Losing this mould causes this moulding technique to be expensive, especially in case of mass production of the abrasive members.
In case moulds suited for multiple use are being used, these moulds must be made of hard-wearing material such as hardmetal. Both applying such expensive material and forming the mould cause this moulding technique to be expensive, although typically suited for applying in mass production techniques. Moreover, such these moulds are suited for only one product form. Slight or great alterations concerning product form result in the need for new moulds.
EP-A-0 147 633 discloses a flexible abrasive member comprising a backing layer to which at one side an attachment is mounted and to which at the other side a permanent one way mould is attached in which deposits are embedded consisting of abrasive particles and bonding material, whereby the mould extends along the height of said deposits.
In producing flexible abrasive members with moulding techniques there is a need for a flexible, fast and cheap method, which not thereby affects the current performance of the abrasive members.
One object of the invention is to provide a flexible abrasive member produced by a moulding technique much cheaper and faster to operate than moulding techniques known in the art, used for making flexible abrasive members.
This object is achieved according to the invention by the abrasive member according to claim 1.
A typical advantage of the present invention is the possibility to produce moulds of any simple or complex shape much cheaper and easier than in the known methods.
The mould as well as the deposits may be made of any ceramic, metal, resin or synthetic material as well as graphite, glass, quartz or sand.
Preferably the mould comprises a through hole substantially in the middle of the mould. By example, this hole forms the area not suited for abrading purposes when applying rotating abrasive members where the axis of the hole is the axis of rotation.
This through hole may also be present in the backing layer and the attachment. This hole may be provided for several purposes. By example, an axle may be put through or coolant may be supplied through.
The mould may be made of a synthetic material. Preferably, this material is a flexible foam material, such as "Plastozote" made by the British Petroleum corporation in sheetform from 1-50 mm thickness. The flexibility of the abrasive member is for a great deal determined by the flexibility of the mould. Particularly flexible abrasive members are required when grinding or polishing curved shapes, as in the case of optical lenses and complex shaped products as a body out of stone or marble.
The synthetic material can be a spongetype foam holding water or coolant. This presents the advantage that water or other type of coolant is no longer needed for cooling purposes at the machine when applying the abrasive member.
The invention relates not only to the abrasive members such as herein referred to and described, but also to the method whereby such resulted. abrasive members are produced or from which these abrasive members
The method of making a flexible abrasive member according to the invention is defined in claim 7.
After moulding the mould is permanently present on the product, supports the deposits and conducts heat away. This moulding technique is much cheaper and faster to operate than moulding techniques known in the art, used for making flexible abrasive members, specifically because the mould is not lost, after moulding the mould has a function in the product making other arrangements for the same purpose redundant, and after moulding the mould does not have to be taken away, cleaned, greased and prepared for the following sequence.
The method of making the flexible abrasive member may comprise the step of applying heatshrinkage in or after one of the steps mentioned above, for the mould to obtain a desired thickness. By heatshrinkage not only the thickness of the mould can be adjusted, the openings present in the mould material can be adjusted also. The latter influences the flexibility of the mould and the capacity for containing water or other type of coolant.
The method of making the flexible abrasive member may comprise the steps of:
  • providing a fill-in mould with a particularly desired external shape and one or more openings corresponding to the openings of the primary mould;
  • positioning said fill-in mould on top of the surface of said primary mould;
    before adhering the deposits in the openings provided in said primary mould and the corresponding openings in said fill-in mould, to the backing layer and/or the primary mould and said fill-in mould.
The method of making the flexible abrasive member may comprise the step adhering the fill-in mould to the surface of said primary mould.
The method of making the flexible abrasive member may comprise the step of applying heatshrinkage in or after one of the steps mentioned above, for the fill-in mould to obtain a desired thickness. By heatshrinkage not only the thickness of the fill-in mould can be adjusted, the openings present in the fill-in mould material can be adjusted also. The latter influences the flexibility of the mould and the capacity for containing water or other type of coolant.
The external shape of the fill-in mould and one or more openings corresponding to the openings in the primary mould are provided by punching or cutting a sheet material.
The fill-in mould may be positioned on top of the surface of said primary mould prior to punching or cutting the external shape of the mould and/or the openings corresponding to the openings in said primary mould.
The invention will be further elucidated referring to an embodiment of the invention shown in the drawings, wherein:
  • Figure 1 shows an embodiment of the invention in perspective from the side and top;
  • Figure 2 shows an abrasive member in perspective from the side and top.
    • In figure 1 a flexible abrasive member 1 embodying the invention is shown, comprising a backing layer 2 to which at one side 3 an attachment 4 is mounted and to which at the other side 5 deposits 6 are adhered consisting of abrasive particles 7 and bonding material 8 such as a resin, and a permanent one way primary mould 9 attached to said other side 5 of the backing layer 2 substantially encircling the deposits 6.
    In the embodiment of figure 1 the permanent one way mould 9 extends all along the height of the deposits 6.
    In the left part of figure 1 a fill-in mould 13 has been provided on top of the surface of the primary mould 9. The fill-in mould 13 extends along the rest of the height of the deposits 6, which height is not being convered by the primary mould 9. The fill-in mould 13 has a particularly desired external shape and one or more openings corresponding to the openings 12 of the primary mould 9.
    In figure 2 a flexible abrasive member 1 is shown having a permanent one way mould 9 extending along part of the height of the deposits 6.
    Both in figure 1 and 2 the flexible abrasive member 1 comprises a through hole 10, 11 substantially in the centre of the member 1 through the permanent one way mould 9 and through the backing layer 2 and the attachment 4 respectively.
    Although not shown in the drawings, the through hole 10, 11 may be absent or may be a blind hole not extending all through the height of the member 1.

    Claims (13)

    1. A flexible abrasive member (1) comprising a backing layer (2) to which at one side (3) an attachment (4) is mounted and to which at another side (5) deposits (6) are adhered consisting of abrasive particles (7) and bonding material (8) such as a resin, wherein a permanent one way primary mould (9) is attached to said other side (5) of the backing layer (2) substantially encircling said deposits (6), which mould (9) extends along a part of the height of said deposits (6), whereby a fill-in mould (13) is provided substantially extending along the rest of the height of said deposits (6), which rest is not covered by said primary mould (9).
    2. A flexible abrasive member according to claim 1, wherein a through hole (10) has been provided substantially in the middle of said primary mould (9).
    3. A flexible abrasive member according to claim 1 or 2, wherein a through hole (11) has been provided substantially in the middle of said backing layer (2) and attachment (4).
    4. A flexible abrasive member according to claim 1-3, wherein said primary mould (9) is made of a synthetic material.
    5. A flexible abrasive member according to claim 4, wherein said synthetic material is flexible foam material.
    6. A flexible abrasive member according to claim 4 or 5, wherein said synthetic material is a spongetype foam holding water or coolant.
    7. Method for making a flexible abrasive member (1), comprising the steps of providing a backing layer (2), mounting an attachment (4) onto one side (3) and a primary mould (9) onto the other side (5) of said backing layer (2), said primary mould being provided with openings by means of punching or cutting a sheet material, and adhering deposits (6) in the openings of said primary mould (9) to the backing layer (2), and said primary mould (9).
    8. A method of making a flexible abrasive member according to claim 7, wherein said primary mould (9) obtains a desired thickness by applying heatshrinkage in or after one of said steps.
    9. A method of making a flexible abrasive member (1) according to claim 7 or 8, comprising the steps of:
      providing a fill-in mould (13) with a particularly desired external shape and one or more openings corresponding to the openings (12) of the primary mould (9);
      positioning said fill-in mould (13) on top of the surface of said primary mould (9);
      before adhering said deposits (6) in the openings (12) provided in said primary mould (9) and the corresponding openings in said fill-in mould (13), to the backing layer (2) and said primary mould (9) and said fill-in mould (13).
    10. A method of making a flexible abrasive member according to claim 9, wherein said fill-in mould (13) is adhered to the surface of said primary mould (9).
    11. A method of making a flexible abrasive member according to claim 9 or 10, wherein said fill-in mould (13) obtains a desired thickness by applying heatshrinkage in or after one of said steps.
    12. A method of making a flexible abrasive member according to claim 8-11, wherein said external shape of said fill-in mould (13) and one or more openings corresponding to the openings (12) in said primary mould (9) are provided by punching or cutting a sheet material.
    13. A method of making a flexible abrasive member according to claim 12, wherein said fill-in mould (13) is positioned on top of the surface of said primary mould prior to punching or cutting the external shape of the mould and/or the openings corresponding to the openings in said primary mould (9).
    EP95909134A 1995-02-27 1995-02-27 Flexible abrasive member with permanent one way mould and method of making same Expired - Lifetime EP0812250B1 (en)

    Applications Claiming Priority (1)

    Application Number Priority Date Filing Date Title
    PCT/NL1995/000074 WO1996026811A1 (en) 1995-02-27 1995-02-27 Flexible abrasive member with permanent one way mould and method of making same

    Publications (2)

    Publication Number Publication Date
    EP0812250A1 EP0812250A1 (en) 1997-12-17
    EP0812250B1 true EP0812250B1 (en) 2000-01-19

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95909134A Expired - Lifetime EP0812250B1 (en) 1995-02-27 1995-02-27 Flexible abrasive member with permanent one way mould and method of making same

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    EP (1) EP0812250B1 (en)
    DE (1) DE69514688T2 (en)
    WO (1) WO1996026811A1 (en)

    Families Citing this family (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US5769700A (en) * 1996-09-10 1998-06-23 Norton Company Grinding wheel
    ITPC20010031A1 (en) * 2001-10-29 2003-04-29 Tullio Arcobello TOOL FOR ROUGHING SURFACES, IN PARTICULAR FOR FLOORING.
    KR101092073B1 (en) * 2011-10-05 2011-12-13 현주빈 The tip fixing holder for all-in-one polishing-tip
    CN102773806A (en) * 2012-07-19 2012-11-14 姜堰市吉祥磨料厂 Double-molding density resin cutting sheet
    CN104227575B (en) * 2014-09-15 2016-07-06 陕西德赛新材料科技有限公司 A kind of flexible abrasive product preparation method implanted based on grinding unit
    JP6899404B2 (en) * 2019-01-08 2021-07-07 株式会社アライドマテリアル Super abrasive wheel

    Family Cites Families (5)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3073716A (en) * 1957-11-08 1963-01-15 Truly Magic Products Inc Method of making a cleaning pad
    US3426486A (en) * 1964-11-16 1969-02-11 Landis Tool Co Abrasive disc
    DE3346916A1 (en) * 1983-12-24 1985-07-04 Elbel-Raberain, Anne-Marie, 7530 Pforzheim METHOD FOR PRODUCING ELASTIC GRINDING BODIES
    US5247765A (en) * 1991-07-23 1993-09-28 Abrasive Technology Europe, S.A. Abrasive product comprising a plurality of discrete composite abrasive pellets in a resilient resin matrix
    ATE128660T1 (en) * 1991-09-02 1995-10-15 Swarovski Tyrolit Schleif GRINDING DISC.

    Also Published As

    Publication number Publication date
    EP0812250A1 (en) 1997-12-17
    DE69514688T2 (en) 2000-07-27
    WO1996026811A1 (en) 1996-09-06
    DE69514688D1 (en) 2000-02-24

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