Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
  • B24D5/12—Cut-off wheels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
  • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
  • B24D13/08—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising annular or circular sheets packed side by side
• • 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
  • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
  • B24D18/0045—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by stacking sheets of abrasive material

Definitions

• the present invention relates to a grinding wheel, and possibly cutting, in disk form, said grinding wheel having a central axis, a central attachment zone and at least one peripheral working zone extending outside the zone of central fixation relative to the central axis, said grinding wheel having at least one layer formed from abrasive grains and two layers containing no abrasive grains flanking the grinding wheel.
• This standard defines in particular essential criteria for the production of deburring wheels, corresponding to the types referenced 27, 28 and 29 in this standard.
• a grinding wheel must imperatively have a thickness of between 4 and 10 mm.
• the present invention thus relates in its broadest sense to a grinding wheel, and possibly cutting, in disk form, said grinding wheel having a central axis, a central fixing zone and at least one peripheral working area.
• said grinding wheel having at least one layer formed from grains abrasive and two layers containing no abrasive grains surrounding the wheel, characterized in that the working area has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.
• This thickness is measurable over the entire width and the entire length of the work area.
• the wheel according to the invention has at least two adjacent working areas and preferably three working areas adjacent two by two.
• the wheel according to the invention may in particular have a thickness greater than or equal to 1 mm and in particular 1.25 mm or 1.6 mm or 2 mm or 2.5 mm or 3.2 mm.
• the grinding wheel according to the invention comprises at least two layers formed from abrasive grains, each of these layers being framed by two layers not containing abrasive grains.
• At least one outer layer containing no abrasive grains, or even the two outer layers containing no abrasive grains have a diameter smaller than the total diameter of the grinding wheel.
• the term "layer” designates a layer comprising at least one material intended to constitute the grinding wheel.
• These layers are of two types: layers containing no abrasive grains, in particular of the "paper” type of protective sheet, or of the “fabric” type reinforcing sheet, or layers formed from abrasive grains, of the type comprising abrasive grains bonded together by a binder.
• the term "slab” designates a constituent layer formed from abrasive grains which has a consistency such that the slab can be handled, and in particular seized and moved by hand or by using a machine.
• This slab may therefore consist of a single layer formed from abrasive grains or may comprise on one side a layer containing no abrasive grains.
• the term "working sector” designates a surface of the grinding wheel in contact with which it is possible to deburr. It is furthermore found that in a completely surprising manner it is possible to use the method of manufacturing thin cutting wheels known from International Patent Application No. WO 00/74898 for the production of grinding wheels according to the invention.
• the present invention thus also relates to a method of manufacturing a grinding wheel, and possibly cutting, in disk form, said grinding wheel having a central axis, a central fixing zone and at least one peripheral working zone. extending externally to the central attachment zone with respect to the central axis, said grinding wheel comprising at least one abrasive grain-based layer and two layers containing no abrasive grains surrounding the grinding wheel, the method according to which:
• a layer based on abrasive grains is formed directly in a mold in the absence of an underlying reinforcing layer
• a reinforcing layer is deposited on this layer of abrasive grains,
• the assembly is pressed to form a grinding wheel, and possibly cutting, including a working area has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.
• the time of passage at each subsequent station can be significantly reduced since it no longer depends on the duration of operations. discharge of the powdered product or pressing under high pressure. In addition, the pressure used can be reduced.
• the present invention also relates to the use of a grinding wheel according to the invention and in particular a grinding wheel made by the process previously described, said grinding wheel being in the form of a disk and having a central axis, a zone of central fixation and at least one peripheral working zone extending outwardly from the central fixation zone with respect to the central axis, the working zone having a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm, to perform a deburring operation.
• the present invention also relates, moreover, to a facility for manufacturing deburring and possibly cutting wheels in the form of a disk, said wheels each having a central axis, a central fixing zone and at least one peripheral working zone. extending to the outer periphery of the central attachment zone with respect to the central axis, said grinding wheels each comprising at least one layer based on abrasive grains and two layers containing no abrasive grains surrounding the grinding wheel, said installation comprising
• an assembly station intended to form a stack of superposed layers from at least one slab and at least one other constituent layer
• a pressing machine for compressing the stack and forming a grinding wheel, and possibly cutting, including a working area has a total thickness of less than 4 mm and preferably less than or equal to 3.2 mm.
• the grinding wheel according to the invention can be used for deburring, as well as possibly for cutting.
• Figure 1 illustrates a grinding wheel (1) according to the invention.
• This grinding wheel (1) has a general disk shape and thus has a central axis X, a central fixing zone F and at least one peripheral working zone Z extending externally to the central fixing zone with respect to the axis central.
• the attachment zone consists of a metal washer and allows the fixing of the wheel on a hub of a grinding machine.
• This washer may not be flat to allow to achieve a wheel with a offset.
• the grinding wheel (1) having at least one, and preferably two, layers (3, 5) formed from abrasive grains and at least two layers containing no abrasive grains (2, 6) the grinding wheel.
• the grinding wheel comprises two layers (3, 5) formed from abrasive grains
• These layers that do not contain abrasive grains (2, 4, 6) are, for example, glass fiber grids coated with phenolic resin.
• a sheet of paper can also be glued to one or both of the outer surfaces of the grinding wheel.
• an outer layer or even the two outer layers not containing abrasive grains (2, 6) to have a diameter smaller than the total diameter of the grinding wheel, and to have a reduced diameter of the order of 2 to 50 mm.
• the layers (3, 5) are formed from abrasive grains which consist, for example, mainly of Alumina (Al 2 O 3 ), or for example a Zirconia-Alumina (ZrO 2 -Al 2 O 3 ) mixture, or even grains mainly consisting of silicon carbide (SiC).
• abrasive grains used may also be subjected to different thermal, mechanical, physical or chemical treatments to improve the abrasive performance (hardness, friability, roughness, etc ).
• the layers (3, 5) formed from these abrasive grains may consist of abrasive grains of different sizes, the average size of which is generally defined by those skilled in the art by the term "grit", or a mixture of grains of different sizes.
• the average size of the abrasive grains is, according to a possible embodiment of the invention, between 1035 microns (grit 24) and 122 microns (grit 150).
• the layers (3, 5) may be formed from the abrasive grains bonded together by a binder composed of various phenolic powder resins (eg Novolak) and / or in liquid (eg Resole) as well as possibly with additives or fillers.
• a binder composed of various phenolic powder resins (eg Novolak) and / or in liquid (eg Resole) as well as possibly with additives or fillers.
• the fillers or additives used may be mainly composed of iron sulphides, aluminum and potassium double fluoride, potassium sulphate or calcium carbonate (lime).
• the working zone Z has a total thickness e of less than 4 mm, and preferably less than or equal to 3.2 mm.
• the grinding wheel (1) has three working areas (S1, S2, S3) adjacent two by two: the sectors S1 and S3 correspond to the main working surfaces and the sector S2 corresponds to the outer edge of the grinding wheel.
• the mixture of grains used in each layer (3,5) consists of two types of grains, one having an average size of 508 ⁇ m (grit 46) representing 85% by volume of the total volume of the mixture of abrasive grains and 1 another having an average size of 406 ⁇ m (grit 60) representing 15% by volume of the total volume of the mixture of abrasive grains.
• the binder used in each layer (3.5) consists of 65% by volume of phenolic resin (liquid + 15% by weight hexamethylenetetramine powder) and fillers: 15% by volume of iron sulphide, 18% by volume of sulphates of potassium and 2% by volume of lime.
• Each layer (3.5) thus consists of approximately 44% by volume of abrasive grains, 46% by volume of binder, the rest being porosity.
• the fabric used for the layers (2, 4, 6) has a basis weight of 195, 170 and 195 grams per square meter, respectively.
• This grinding wheel has after manufacture a thickness e of about 2.5 mm and an overall diameter of 125 mm. This wheel, although not having the thickness required by the ISO standard

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Food-Manufacturing Devices (AREA)
• Pens And Brushes (AREA)
• Sliding-Contact Bearings (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (2)

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Family Applications (1)

Country Status (21)

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• 2006
  • 2006-03-06 FR FR0650776A patent/FR2898070B1/fr not_active Expired - Fee Related
• 2007
  • 2007-03-01 WO PCT/FR2007/050864 patent/WO2007101957A2/fr not_active Ceased
  • 2007-03-01 MX MX2008011327A patent/MX2008011327A/es active IP Right Grant
  • 2007-03-01 EP EP07731681A patent/EP1993786B1/de not_active Revoked
  • 2007-03-01 NZ NZ569257A patent/NZ569257A/en not_active IP Right Cessation
  • 2007-03-01 DK DK07731681.8T patent/DK1993786T3/da active
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  • 2007-03-01 AT AT07731681T patent/ATE536960T1/de active
  • 2007-03-01 BR BRPI0707966-4A patent/BRPI0707966B1/pt not_active IP Right Cessation
  • 2007-03-01 CA CA2644859A patent/CA2644859C/fr not_active Expired - Fee Related
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  • 2007-03-01 SI SI200730880T patent/SI1993786T1/sl unknown
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  • 2007-03-01 AU AU2007222236A patent/AU2007222236B2/en not_active Ceased
  • 2007-03-01 ES ES07731681T patent/ES2379114T3/es active Active
  • 2007-03-01 DE DE202007019685.7U patent/DE202007019685U1/de not_active Expired - Lifetime
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• 2008
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  • 2008-10-03 NO NO20084163A patent/NO20084163L/no not_active Application Discontinuation
• 2012
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