EP0254302B1 - Disque d'ébauche - Google Patents

Disque d'ébauche Download PDF

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Publication number
EP0254302B1
EP0254302B1 EP19870110631 EP87110631A EP0254302B1 EP 0254302 B1 EP0254302 B1 EP 0254302B1 EP 19870110631 EP19870110631 EP 19870110631 EP 87110631 A EP87110631 A EP 87110631A EP 0254302 B1 EP0254302 B1 EP 0254302B1
Authority
EP
European Patent Office
Prior art keywords
abrasive grain
grinding
grinding wheel
layer
coarse
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
EP19870110631
Other languages
German (de)
English (en)
Other versions
EP0254302A1 (fr
Inventor
Johann Huber
Jürgen Hosp
Walter Klausner
Hubert Mair
Volker Selgrad
Otto Thanner
Rudolf Zimmermann
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.)
Tyrolit-Schleifmittelwerke Swarovski KG
Original Assignee
Tyrolit-Schleifmittelwerke Swarovski KG
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
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Application filed by Tyrolit-Schleifmittelwerke Swarovski KG filed Critical Tyrolit-Schleifmittelwerke Swarovski KG
Publication of EP0254302A1 publication Critical patent/EP0254302A1/fr
Application granted granted Critical
Publication of EP0254302B1 publication Critical patent/EP0254302B1/fr
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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

Definitions

  • the invention relates to a rigid grinding wheel with a countersunk hub with synthetic resin-bonded abrasive grains and a preferably mesh-shaped reinforcement introduced into the grinding wheel.
  • Such a grinding wheel is described in US-A-3121981. Several layers of abrasive grain are pressed into one grinding wheel. The grain size of the abrasive grain in the individual layers is the same.
  • a similar grinding wheel is known, for example, from the applicant's own AT-PS 313 741, in which case it is a flexible grinding wheel.
  • the currently highest circumferential speed approved by the authorities is 80 m per second, a minimum blasting speed of 150 m / sec is required by law.
  • the power of the angle grinders on the market is between 1 and 2.5 kW.
  • the contact pressure of the grinding wheel on the workpiece is determined by the human force and this moves comparatively within narrow limits.
  • the current state of grinding technology is as follows: The use of coarse grain increases the service life, the power factor d. H. the ratio of the amount of ground material to wheel wear and the grinding performance per unit of time increases, the following disadvantages occur: rough surface, poor run-off of the wheel, uneven grinding, reduction in explosive value, combined with lower mechanical strength, in particular with regard to lateral rigidity.
  • the thin cover layers used up to now have the disadvantage that grain groups splinter away at the edge due to the low rigidity and strength.
  • the object of the invention is therefore to improve a grinding wheel of the type mentioned in such a way that the grinding and the service life are improved, and in particular that the flying away of grinding wheel pieces from the circumference of the grinding wheel is reduced or avoided entirely without the disadvantages of the previous designs occur.
  • the object of the invention is achieved in that the grinding wheel has an abrasive layer with coarse-grained abrasive grain and a grinding layer serving as a support layer with fine-grained abrasive grain, the coarse-grained abrasive layer being thinner than the fine-grained abrasive layer.
  • the carrier layers are reinforced compared to the previous systems because, in addition to the better drainage behavior, they primarily have the task of supporting the coarse grain layer. This means that the fine grain layer must be made stronger and is therefore two-layered.
  • the thickness of the grinding layer is max. 40% of the total thickness of the grinding wheel, whereby in one embodiment the thickness of the grinding layer is max. 25% of the total thickness of the grinding wheel.
  • An embodiment of the invention provides that the abrasive grain sizes of the backing layer range from 54 to 30 in accordance with the FEPA standard, the backing layer advantageously containing one third each of abrasive grain sizes 30, 36 and 46 in accordance with the FEPA standard.
  • the abrasive grain sizes of the abrasive layer advantageously range from 24 to 16 in accordance with the FEPA standard.
  • half of the abrasive layer contains abrasive grains of grain sizes 20 and 24 in accordance with the FEPA standard.
  • An embodiment of the invention provides that the abrasive grain of the backing layer is normal corundum and the abrasive grain of the abrasive layer is zirconium corundum.
  • FIG. 1 schematically shows a diagram of a disk grinding wheel according to the invention, partly in section
  • FIG. 2 shows a schematically held radial section through a disk grinding wheel according to the invention in the working position.
  • the grinding wheel according to the invention has a narrow grinding layer 1 and a stronger backing layer 2.
  • the grinding layer 1 and backing layer 2 differ fundamentally by the grain size of the abrasive grain 8, 9 contained therein, which is coarser in the grinding layer 1 than in the backing layer 2 .
  • the resin binder in the two layers 1, 2 is preferably the same, or at least the same, processable. Conventional fillers can also be found in the grinding layer 1 and in the backing layer 2.
  • the grinding wheel is provided with two reinforcing fabrics 3, one of which is located approximately in the middle of the carrier layer 2 and the second in the transition region between the grinding layer 1 and carrier layer 2.
  • the carrier layer 2 can be provided with a cover plate 4, which is formed, for example, by a glass fabric with thermally curable phenolic resin impregnation.
  • both the actual grinding layer 1 and the carrier layer 2 on the workpiece 5 come into play during the grinding process.
  • the relatively narrow grinding layer 1 brings about good sanding, while the very wide backing layer 2 achieves a very good polishing effect.
  • the grinding wheel is driven in a conventional manner via a drive shaft 7 of an angle grinder inserted into the hub 6.

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

Claims (8)

1. Meule de dégrossissage rigide à moyeu dépor­té, contenant des abrasifs liés par une résine synthétique et avec une armature, de préférence réticulaire, noyée dans la meule, caractérisée en ce que la meule présente une couche abrasive (1) comportant un abrasif à gros grain et une couche abrasive (2) servant de couche porteuse et possédant un abrasif à grain fin, la couche abrasive à gros grain (1) étant plus mince que la couche abrasive à grain fin (2).
2. Meule de dégrossissage rigide selon la revendication 1, caractérisé en ce que l'épaisseur de la couche abrasive (1) contenant un abrasif à gros grain représente au maximum 40% de l'épaisseur totale de la meule.
3. Meule de dégrossissage rigide selon la revendication 1, caractérisée en ce que les grosseurs de grain de l'abrasif de la couche abrasive (2) comprenant un abrasif à grain fin sont comprises entre 54 et 30, selon la norme FEPA.
4. Meule de dégrossissage rigide selon la revendication 3, caractérisée en ce que la couche abrasive (2) à abrasif à grain fin comprend des abrasifs des grains 30, 36 et 46 selon la norme FEPA, représentant chacune un tiers.
5. Meule de dégrossissage rigide selon la revendication 1, caractérisée en ce que les grosseurs de grain abrasif de la couche abrasive (1) à abrasif à gros grain vont de 24 à 16 selon la norme FEPA.
6. Meule de dégrossissage rigide selon la revendication 5, caractérisée en ce que la couche abrasive (1) à abrasif à gros grain comprend des abrasifs (8) des grains 20 et 24 selon la norme FEPA, représentant chacune la moitié.
7. Meule de dégrossissage rigide selon les re­ vendications 3 et 6, caractérisée en ce que l'abrasif (9) de la couche abrasive (2) à abrasif à grain fin est composé de corindon normal et l'abrasif (8) de la couche abrasive (1) à abrasif à gros grain est composé de zirco­ne-corindon.
8. Meule de dégrossissage rigide selon la revendication 2, caractérisée en ce que l'épaisseur de la couche abrasive (1) possédant un abrasif à gros grain représente au maximum 25% de l'épaisseur totale de la meule.
EP19870110631 1986-07-24 1987-07-22 Disque d'ébauche Expired - Lifetime EP0254302B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT2001/86 1986-07-24
AT200186A AT386781B (de) 1986-07-24 1986-07-24 Schruppscheibe

Publications (2)

Publication Number Publication Date
EP0254302A1 EP0254302A1 (fr) 1988-01-27
EP0254302B1 true EP0254302B1 (fr) 1991-01-30

Family

ID=3525686

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870110631 Expired - Lifetime EP0254302B1 (fr) 1986-07-24 1987-07-22 Disque d'ébauche

Country Status (4)

Country Link
EP (1) EP0254302B1 (fr)
AT (1) AT386781B (fr)
DE (1) DE3767800D1 (fr)
ES (1) ES2021643B3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI9600276A (sl) * 1996-09-16 1998-06-30 Comet Umetni Brusi In Nekovine D.D. Abrazivna rezalnobrusna plošča
DE102010020601B4 (de) * 2010-05-14 2013-01-24 Saint-Gobain Diamantwerkzeuge Gmbh & Co. Kg Schleifscheibe
US20210323113A1 (en) * 2016-08-10 2021-10-21 Klingspor Ag Roughing Disc Having a Backing Layer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB454474A (en) * 1934-12-19 1936-10-01 Norton Grinding Wheel Co Ltd Improvement in grinding wheels
US3121981A (en) * 1960-09-23 1964-02-25 Rexall Drug Chemical Abrasive wheels and method of making the same
AT302842B (de) * 1970-10-12 1972-10-25 Swarovski Tyrolit Schleif Schleifscheibe
AT313741B (de) * 1972-10-12 1974-02-25 Swarovski Tyrolit Schleif Flexible Tellerschleifscheibe
FR2329410A1 (fr) * 1975-10-28 1977-05-27 Du Pont Article abrasif perfectionne
SE8004172L (sv) * 1979-06-26 1980-12-27 Lippert H Gmbh Sliporgan for metallbearbetning
AT379100B (de) * 1982-12-21 1985-11-11 Swarovski Tyrolit Schleif Verfahren zur herstellung einer schleifscheibe

Also Published As

Publication number Publication date
ATA200186A (de) 1988-03-15
DE3767800D1 (de) 1991-03-07
ES2021643B3 (es) 1991-11-16
AT386781B (de) 1988-10-10
EP0254302A1 (fr) 1988-01-27

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