EP0345239A1 - Topfschleifscheibe und Verwendung derselben zum Schleifen und mechanischen Polieren von Glas - Google Patents

Topfschleifscheibe und Verwendung derselben zum Schleifen und mechanischen Polieren von Glas Download PDF

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Publication number
EP0345239A1
EP0345239A1 EP89870071A EP89870071A EP0345239A1 EP 0345239 A1 EP0345239 A1 EP 0345239A1 EP 89870071 A EP89870071 A EP 89870071A EP 89870071 A EP89870071 A EP 89870071A EP 0345239 A1 EP0345239 A1 EP 0345239A1
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EP
European Patent Office
Prior art keywords
grinding wheel
microns
axis
cup
rotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89870071A
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English (en)
French (fr)
Inventor
Charles Pierre Hallez
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.)
Diamant Boart NV SA
Original Assignee
Diamant Boart NV SA
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Filing date
Publication date
Application filed by Diamant Boart NV SA filed Critical Diamant Boart NV SA
Publication of EP0345239A1 publication Critical patent/EP0345239A1/de
Withdrawn legal-status Critical Current

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    • 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
    • B24D7/10—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 cooling provisions

Definitions

  • the present invention relates to a cup type grinding wheel, provided with an abrasive coating disposed symmetrically with respect to the axis of rotation of the grinding wheel and formed of diamond elements produced from diamond grains agglomerated by a metallic binder. or organic and separated by grooves.
  • the invention finds its main application in the glass industry, the crystal industry and the manufacture of ceramic objects.
  • Document FR-B-1104941 discloses a grinding wheel of the kind described above, constituted by a body receiving a working strip having an embossed appearance.
  • the strip is formed by diamond elements produced from diamond grains agglomerated by a metallic or organic binder, said diamond elements being separated by grooves, so as to have a square, parallelepiped, lozenge, circular, hexagonal or irregular shape.
  • the profile, shape and dimensions of this wheel are very varied and the size of the grains is a function of the type of operation expected from the grinding wheel, from roughing to specular polishing.
  • Document BE-A-905.292 discloses a mechanical process for polishing and / or smoothing a flat surface of a glass object driven in rotation about an axis perpendicular to this surface.
  • This method uses an abrasive crown of a rotary grinding wheel, the abrasive crown rotating around an axis offset, relative to its geometric axis, by a distance less than the radius of the crown, and the axis of rotation of the crown. being parallel to the geometric axis of the latter and to the axis of rotation of the surface to be treated.
  • the sweeping of the surface to be treated by the rotary grinding wheel under constant pressure along a flat or curved surface of a glass, crystal or ceramic material object provides perfect polishing free of streaks. If the grain is fine enough, the grinding wheel restores the shine on the surfaces of glass, crystal or ceramic objects, which have become dull due to prior grinding operation. However, it has the drawback of comprising a strip of abrasive material mounted eccentrically on the crown of the grinding wheel.
  • Document BE-A-08700437 also discloses a method for mechanically polishing a flat surface of a glass object using a cup type grinding wheel having its side furnished with a strip of abrasive material, the grinding wheel being driven in rotation about an axis inclined with respect to the axis of rotation of the surface to be polished, so as to apply the grinding wheel against the object to be polished along a contact generator, under an appropriate and constant pressure for the duration of grinding and / or polishing.
  • This arrangement makes it possible to scan each point of the surface to be treated and to achieve a well defined depth of pass.
  • the flank of the cup type grinding wheel is lined with a removable strip carried by a support of compressible elastic material, mounted eccentrically to the geometric axis of the grinding wheel, by a distance less than the mean radius of the flank of the grinding wheel, the axis of rotation of the strip being inclined relative to its geometric axis and relative to the axis of rotation of the surface to be treated.
  • This method like the previous one, has the disadvantage of using a removable strip of abrasive material mounted so offset on the crown of the wheel.
  • the balancing of this eccentric mass relative to the axis of rotation of the grinding wheel is done using an unbalance mounted on the grinding wheel.
  • the balance gradually deteriorates and we observe the appearance of more and more annoying vibrations.
  • the present invention aims to overcome the aforementioned drawbacks. It offers a cup type grinding wheel fitted with a coating extending symmetrically with respect to the axis of rotation of the grinding wheel and formed of diamond elements produced from diamond grains agglomerated by a metallic or organic binder, said diamond elements being separated by grooves, characterized in that the abrasive coating is fixed on at least part of the surface of the grinding wheel and in that it is composed of diamond grains having a size between 1 and 100 microns.
  • the abrasive grains belong to one of the following classes: 15 - 30 microns 10 - 20 microns 6 - 12 microns 4 - 8 microns 3 - 6 microns.
  • the grooves have a width of between 0.5 to 4 mm, preferably 2 mm, and a depth of 0.5 to 2 mm, preferably 1 mm.
  • the grooves are orthogonal to each other and determine squares having approximately 4 to 12 mm in side, preferably sides of 6 mm.
  • the grooves advantageously have a width of 1 to 3 mm, and a depth of 0.5 to 2 mm.
  • Grooves are generally provided in the abrasive coating of the grinding wheels intended for roughing operations on a surface of hard material, that is to say in an abrasive coating consisting of relatively large grains.
  • the known grinding wheels, intended for finishing operations generally have a uniform abrasive surface with fine grains or with diamond concretion with metallic or resinoid binder fixed on an elastic support as described in European patent application No. 793027921.
  • an embossed abrasive coating fixed directly to the body of the cup type grinding wheel as claimed provides a better surface finish than an abrasive coating distributed uniformly over the surface of the grinding wheel.
  • the grinding wheel according to the invention makes it possible to complete a surface of glass or more or less rough mineral material which has already undergone a preliminary roughing and / or cutting operation, by which the coarsest defects, such as blows, are eliminated. blades, deviations or defects in removal of the pontil if it is a molded part.
  • the invention also relates to the use of the abovementioned wheel for grinding and polishing. mechanics of a flat or substantially curved surface of a glass object.
  • the grinding wheel In the case of a cup-type grinding wheel with a cylindrical flank, the grinding wheel is of course driven in rotation about an axis orthogonal to the axis of rotation of the surface.
  • the grinding wheel has a frustoconical side or in a spherical surface segment, it is rotated around an axis inclined relative to the axis of rotation of the surface to grind and mechanically polish a spherical surface, so applying said grinding wheel along a portion of contact surface, against the object to be polished, under an appropriate and constant pressure for the duration of grinding and / or polishing.
  • the grinding wheel is usually driven in rotation at a speed of the order of 1800 to 4000 revolutions / minute around its axis of rotation.
  • the invention makes it possible to modify, without charge, the equipment existing to date to implement the method described above.
  • the mechanical smoothing and / or polishing process using the grinding wheel according to the invention lends itself perfectly to automation. It allows to combine the roughing, the size and the polishing of a surface in mineral material, these various operations being distributed either on various machines with transfer members from one machine to another, or gathered on a single and same machine in which grinding stations are arranged in series so as to successively receive the object to be treated. Objects can be loaded continuously and the above operations can be robotized.
  • the grinding wheel according to the invention accelerates the obtaining of a perfect optical polish by a completely automatic process, making possible the mechanical mass production of glass or crystal surfaces which was until now only accessible by manual processes. and empirical.
  • the cup-type grinding wheel designated as a whole by the reference sign 1 has an annular ring 2 provided on its upper face 4 with an abrasive coating 3 fixed for example by electrolytic deposition, so as to form an annular, uniform abrasive surface, arranged symmetrically with respect to the axis of rotation LL ′ of the grinding wheel 1.
  • the abrasive coating 3 consists of fine diamond grains agglomerated by a metallic or organic binder.
  • the diamond grains in accordance with the invention, have a size of between 1 and 100 microns approximately and belong to one of the following particle size classes: 15 - 30 microns 10 - 20 microns 6 - 12 microns 4 - 8 microns 3 - 6 microns
  • the grooves 5 intended to facilitate watering during the work of the grinding wheel.
  • the grooves 5 are arranged symmetrically with respect to the axis of rotation LL ′ of the grinding wheel and they are orthogonal to one another, for example determining squares 12 having approximately 4 to 12 mm in side, preferably squares with 6 mm sides.
  • the grooves 5 advantageously have a width of 0.5 to 4 mm and a depth of about 0.5 to 2 mm.
  • the diamond crown 2 has for example a width of between 10 and 40 mm (preferably 30 mm), furnished with squares 12 interspersed with intersecting grooves 5 preferably having a width of approximately 2 mm and a depth of approximately 1 mm.
  • a grinding wheel according to Figure 1 can be used to soften and / or polish a flat surface of an object made of glass, crystal or ceramic material for example.
  • Figure 2 shows a grinding wheel 1 according to Figure 1 and the perimeter of the flat base 10 of a glass object.
  • the surface to be treated 10 is kept constantly in contact with the abrasive coating by any means.
  • the contact area is hatched in Figure 2 and designated by the reference sign 11.
  • the grinding wheel is rotated around the axis LL ′ which is parallel to the axis of rotation SS ′ of the surface to be treated 10 and it is made to sweep the surface 10 in directions perpendicular to each other, so as to cover the entire surface 10 to be polished while maintaining a constant pressure.
  • the sweeping is done under intense watering.
  • the grinding wheel according to the invention may also have an abrasive coating on any part of its surface, for example on an oblique flank forming a frustoconical surface or any surface segment of curved revolution.
  • FIG. 3 schematically represents an exemplary machine (machine type MAXI-FLETTE® of the firm BIEBUYCK ®) using a grinding wheel according to the invention the abrasive coating of which covers the frustoconical flank 2.
  • the machine shown in FIG. 2 comprises a rotary gripping head 18 driven by a drive motor 21, a means for feeding the gripping head and an object 7 towards the grinding wheel 1 rotated to apply said object to the grinding wheel under an appropriate and controlled pneumatic pressure for the duration of grinding and / or polishing.
  • the cup type wheel is wedged on a floating shaft 8 of an electric motor 9, as described in Belgian patent No 696.828.
  • the object 7 having a surface 10 to be treated is gripped in a gripping plate 18 driven in rotation by the shaft 20 of the motor 21, for example in the direction of the arrow X, around an axis of rotation SS ′ perpendicular to the surface 10 to be treated.
  • This surface 10 is brought into contact parallel to itself with the abrasive coating 3 of the frustoconical diamond crown 2 of a rotary grinding wheel 1, this crown 2 rotating around its geometric axis LL ′ which is here inclined relative to the axis SS ′.
  • the crown 2 is driven in a rotational movement around the axis LL ′, in the direction of the arrow Y.
  • the speeds and the directions of rotation of the surface 10 to be treated and of the diamond crown 2 can be identical or different.
  • the drive motor 21 of the rotating object 7 is hydraulically controlled. Its speed can be varied continuously from 1 revolution to 40 revolutions / minute by means of a speed regulator.
  • the grinding wheel is subjected to a sweeping movement in directions perpendicular to each other, so as to cover the entire surface to be polished. This sweep is done under intense watering.
  • the amplitude of each scan is of the order of 10 to 100 mm, preferably 40 mm.
  • a substantially constant pressure is applied by the diamond crown 2 to the surface 10 during the treatment thereof. This constant pressure is ensured by the floating shaft 8 which is itself subjected to a thrust exerted by a fluid as described in Belgian patent No 696.828.
  • the abrasive ring can have an outside diameter of 100 mm to 250 mm, preferably a diameter of 150 mm.
  • the abrasive coating 3 can have a width of 10 to 40 mm, preferably a width of 30 mm, an outside diameter of 150 mm and an inside diameter of about 90 mm.
  • FIG. 4 represents a machine similar to that which is shown in FIG. 3, but in which a grinding wheel according to the invention is used, the abrasive coating of which extends on a side 2 forming a segment of surface of curved revolution.
  • results obtained on rough glass or crystal surfaces, to be cut on a flat (or spherical concave) surface depend on the fineness of the diamond used.
  • diamond belonging to one of the following classes 15 - 30 microns 10 - 20 microns 6 - 12 microns 4 - 8 microns 3 - 6 microns.
  • Cerium oxide buffing can be applied directly manually or automatically.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP89870071A 1988-05-30 1989-05-25 Topfschleifscheibe und Verwendung derselben zum Schleifen und mechanischen Polieren von Glas Withdrawn EP0345239A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE8800603 1988-05-30
BE8800603A BE1001701A3 (fr) 1988-05-30 1988-05-30 Meule a boisseau et utilisation de celle-ci pour le meulage et le polissage mecaniques du verre.

Publications (1)

Publication Number Publication Date
EP0345239A1 true EP0345239A1 (de) 1989-12-06

Family

ID=3883430

Family Applications (1)

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EP89870071A Withdrawn EP0345239A1 (de) 1988-05-30 1989-05-25 Topfschleifscheibe und Verwendung derselben zum Schleifen und mechanischen Polieren von Glas

Country Status (4)

Country Link
EP (1) EP0345239A1 (de)
JP (1) JPH0224063A (de)
BE (1) BE1001701A3 (de)
FI (1) FI892606A (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174795A (en) * 1990-05-21 1992-12-29 Wiand Ronald C Flexible abrasive pad with ramp edge surface
US5197249A (en) * 1991-02-07 1993-03-30 Wiand Ronald C Diamond tool with non-abrasive segments
US5209760A (en) * 1990-05-21 1993-05-11 Wiand Ronald C Injection molded abrasive pad
US5232470A (en) * 1990-05-21 1993-08-03 Wiand Ronald C Flexible one-piece diamond sheet material with spaced apart abrasive portions
US5551960A (en) * 1993-03-12 1996-09-03 Minnesota Mining And Manufacturing Company Article for polishing stone
US5607488A (en) * 1990-05-21 1997-03-04 Wiand; Ronald C. Molded abrasive article and process
US5632790A (en) * 1990-05-21 1997-05-27 Wiand; Ronald C. Injection molded abrasive article and process
WO1998029217A1 (en) * 1997-01-03 1998-07-09 Minnesota Mining And Manufacturing Company Method and article for the production of optical quality surfaces on glass
US5888119A (en) * 1997-03-07 1999-03-30 Minnesota Mining And Manufacturing Company Method for providing a clear surface finish on glass
US5910471A (en) * 1997-03-07 1999-06-08 Minnesota Mining And Manufacturing Company Abrasive article for providing a clear surface finish on glass
WO2000059681A1 (en) * 1999-04-01 2000-10-12 Koninklijke Philips Electronics N.V. Cmp pad conditioner arrangement and method therefor
US6231629B1 (en) 1997-03-07 2001-05-15 3M Innovative Properties Company Abrasive article for providing a clear surface finish on glass
US6524681B1 (en) 1997-04-08 2003-02-25 3M Innovative Properties Company Patterned surface friction materials, clutch plate members and methods of making and using same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106457525A (zh) * 2014-06-10 2017-02-22 奥林巴斯株式会社 研磨工具、研磨方法及研磨装置
CN110202492B (zh) * 2018-02-28 2021-05-14 常州市达蒙砂轮制造有限公司 一种带钾硫复合物的砂轮片

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1104941A (fr) * 1954-05-19 1955-11-25 Perfectionnement aux meules notamment aux meules diamant
GB778811A (en) * 1954-10-08 1957-07-10 Universal Grinding Wheel Compa Improvements in or relating to metal bonded diamond grinding tools
BE568518A (de) * 1958-06-11 1960-11-04
FR1595775A (de) * 1968-07-20 1970-06-15
US4037367A (en) * 1975-12-22 1977-07-26 Kruse James A Grinding tool

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1104941A (fr) * 1954-05-19 1955-11-25 Perfectionnement aux meules notamment aux meules diamant
GB778811A (en) * 1954-10-08 1957-07-10 Universal Grinding Wheel Compa Improvements in or relating to metal bonded diamond grinding tools
BE568518A (de) * 1958-06-11 1960-11-04
FR1595775A (de) * 1968-07-20 1970-06-15
US4037367A (en) * 1975-12-22 1977-07-26 Kruse James A Grinding tool

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5174795A (en) * 1990-05-21 1992-12-29 Wiand Ronald C Flexible abrasive pad with ramp edge surface
US5209760A (en) * 1990-05-21 1993-05-11 Wiand Ronald C Injection molded abrasive pad
US5232470A (en) * 1990-05-21 1993-08-03 Wiand Ronald C Flexible one-piece diamond sheet material with spaced apart abrasive portions
US5607488A (en) * 1990-05-21 1997-03-04 Wiand; Ronald C. Molded abrasive article and process
US5632790A (en) * 1990-05-21 1997-05-27 Wiand; Ronald C. Injection molded abrasive article and process
US5681362A (en) * 1990-05-21 1997-10-28 Wiand; Ronald C. Molded abrasive article and process
US5197249A (en) * 1991-02-07 1993-03-30 Wiand Ronald C Diamond tool with non-abrasive segments
US5551960A (en) * 1993-03-12 1996-09-03 Minnesota Mining And Manufacturing Company Article for polishing stone
WO1998029217A1 (en) * 1997-01-03 1998-07-09 Minnesota Mining And Manufacturing Company Method and article for the production of optical quality surfaces on glass
US5876268A (en) * 1997-01-03 1999-03-02 Minnesota Mining And Manufacturing Company Method and article for the production of optical quality surfaces on glass
US5989111A (en) * 1997-01-03 1999-11-23 3M Innovative Properties Company Method and article for the production of optical quality surfaces on glass
US6155910A (en) * 1997-01-03 2000-12-05 3M Innovative Properties Company Method and article for the production of optical quality surfaces on glass
US5888119A (en) * 1997-03-07 1999-03-30 Minnesota Mining And Manufacturing Company Method for providing a clear surface finish on glass
US5910471A (en) * 1997-03-07 1999-06-08 Minnesota Mining And Manufacturing Company Abrasive article for providing a clear surface finish on glass
US6110015A (en) * 1997-03-07 2000-08-29 3M Innovative Properties Company Method for providing a clear surface finish on glass
US6231629B1 (en) 1997-03-07 2001-05-15 3M Innovative Properties Company Abrasive article for providing a clear surface finish on glass
US6524681B1 (en) 1997-04-08 2003-02-25 3M Innovative Properties Company Patterned surface friction materials, clutch plate members and methods of making and using same
WO2000059681A1 (en) * 1999-04-01 2000-10-12 Koninklijke Philips Electronics N.V. Cmp pad conditioner arrangement and method therefor
KR100691031B1 (ko) * 1999-04-01 2007-03-09 코닌클리즈케 필립스 일렉트로닉스 엔.브이. Ｃｍｐ 패드 조절 장치

Also Published As

Publication number Publication date
FI892606A (fi) 1989-12-01
FI892606A0 (fi) 1989-05-29
BE1001701A3 (fr) 1990-02-13
JPH0224063A (ja) 1990-01-26

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