EP0242410A1 - Method of manufacturing an elastic grinding body - Google Patents

Method of manufacturing an elastic grinding body Download PDF

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Publication number
EP0242410A1
EP0242410A1 EP86105309A EP86105309A EP0242410A1 EP 0242410 A1 EP0242410 A1 EP 0242410A1 EP 86105309 A EP86105309 A EP 86105309A EP 86105309 A EP86105309 A EP 86105309A EP 0242410 A1 EP0242410 A1 EP 0242410A1
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EP
European Patent Office
Prior art keywords
grinding
layer
negative mold
abrasive grain
abrasive
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Granted
Application number
EP86105309A
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German (de)
French (fr)
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EP0242410B1 (en
Inventor
Karl Dr. Elbel
Gottfried Wachter
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CARBORUNDUM SCHLEIFMITTELWERKE GMBH
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Carborundum Schleifmittelwerke GmbH
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Priority to EP86105309A priority Critical patent/EP0242410B1/en
Priority to DE8686105309T priority patent/DE3671712D1/en
Priority to AT86105309T priority patent/ATE53324T1/en
Publication of EP0242410A1 publication Critical patent/EP0242410A1/en
Application granted granted Critical
Publication of EP0242410B1 publication Critical patent/EP0242410B1/en
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    • 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

Definitions

  • the application relates to a method for producing an elastic grinding body for shape-following grinding, which consists of a carrier layer and an active grinding layer applied thereon from free-standing grinding knobs made of a binder-grinding grain mixture, using a negative mold which can be inserted into a support part to produce the grinding active layer.
  • Abrasive bodies of the type mentioned are known, for example, from EP-A 0095 055 and EP-A 0114 280.
  • the abrasive bodies produced in this way have the disadvantage, among other things, that after the abrasive layer has worn out, the rest of the body (core with the elastomer layer lying thereon) has at least partially become unusable. It therefore follows that approximately 80 to 90 percent by weight of the abrasive is lost and must be sent to a corresponding landfill. This serious deficiency is also present in the grinding belts used to date and those known grinding wheels for shape-following grinding, which contain hard-bonded abrasive grain conglomerates embedded in an elastomeric matrix.
  • the object of the invention is therefore to provide a method with which such abrasive bodies can be produced more easily and better, and residual bodies (core with elastomer layer) can be re-coated after the abrasive grain layer has worn out.
  • this object is achieved in that the annular support part with the negative form is arranged over a base body formed from a core and the carrier layer applied thereon, in such a way that the lower inner edges of the negative form coincide with the outer upper edge of the carrier layer, starting with The depressions at the bottom of the negative mold are poured out with the binder-abrasive grain mixture, the negative mold being lowered continuously or step by step to such an extent that the filled-in depressions are closed by the backing layer, and after the binder-abrasive grain mixture has hardened, the supporting part is cured the negative form is removed from the grinding-active layer produced in this way.
  • the idea of the invention is therefore that the cores of the grinding wheels with the elastomer layer can be used several times, so that, in addition to reducing the grinding costs, a lower environmental impact is achieved by grinding wheel cores that can no longer be used.
  • the abrasive grain-binder mixture is structurally viscous and is vibrated to pour out the recesses of the negative mold and is thereby liquefied, and it is further provided that a fabric pad is applied to the carrier layer before filling with the binder abrasive grain mixture.
  • the fabric cover can expediently consist of two coils of a tear-resistant, synthetic fabric which is firmly connected to the base body with a suitable elastomeric binder. After the return of such a body with a worn abrasive layer, the outer of the two fabric wraps is sanded, provided with a fresh fabric wrap and is then available for re-use with an abrasive grain layer.
  • the production of the abrasive grain layer can start from all known abrasive grain binder mixtures, for example also based on epoxy or polyester resin, but it has proven particularly advantageous to use an abrasive grain binder mixture according to EP-A 0 114 280, which can be liquefied by vibration .
  • the active grinding layer can be up to 20 mm high, in contrast to the known methods mentioned above, more than doubling. This results in service lives that are at least the same as those achieved by the known conglomerate disks, but the latter are not only more complex to manufacture, but can also no longer be reapplied after the abrasive layer has worn out and are also not oil-resistant. This results in areas of application for the extraordinarily chemical and oil-resistant abrasive articles which have been produced according to the invention, wherever grinding is carried out with oil, emulsions or semi-synthetic coolants.
  • Figures 1 and 2 show an abrasive body, as it can be produced or regenerated by the inventive method. It is constructed in a wheel shape, its peripheral area is formed by the active grinding layer 11 in the form of grinding knobs which are completely separated from one another so that they move individually on the underlying carrier layer 12 formed from a solid or foamed elastomer, ie the respective grinding surface can adjust. Between the backing layer 12 and the grinding-active layer 11 is a fabric layer 13 provided, which may consist of two fabric wraps, for example.
  • the inner part of the grinding wheel finally consists of a hard core 14 with a central bore 15.
  • the surface design i.e. the cross-sectional design of the grinding nubs of the grinding active layer 11 can be adapted to the particular application of the grinding wheel and, for example, have the shape indicated in FIGS. 3 to 6, the ratio of grinding nubs and interspaces being particularly important for the respective grinding task.
  • the basic idea of the method according to the invention is now not only to apply the outer grinding-active layer 11, that is to say the grinding nubs, for the first time to the base body consisting of carrier layer 12 and core 14, but also to apply it again and again to the base body after its wear, that is to say a " To allow retreading "of the active grinding layer 11.
  • FIGS. 7-9 show the devices provided for carrying out this method; the method according to the invention is now explained with reference to these figures:
  • the basic body consisting of the core 14 with a bore 15 and the carrier layer 12 with the fabric layer 13, is produced by known methods, for example in accordance with the publications mentioned above, and does not need to be explained in particular.
  • a base body 16 (FIG. 7) is first produced from wood, metal, plastic or another suitable material, the surface design of which corresponds to or specifies the surface design of the later grinding-active layer 11, for example accordingly Figures 3-6.
  • the knobs 11A of the base body 16 therefore correspond in shape to the knobs of the active grinding layer 11.
  • This base body thus forms a positive mold that can be used again and again to cast an elastic negative mold 18 therefrom, for example silicone rubber being used as the material for the negative mold 18, which is poured into the space between the base body 16 and an outer annular support part 17 .
  • an elastic negative mold 18 for example silicone rubber being used as the material for the negative mold 18, which is poured into the space between the base body 16 and an outer annular support part 17 .
  • the support ring 17 is pulled off, the negative mold 18 is cut open at one point on its circumference and pulled off the positive mold (base body 16), after which the negative mold 18 is reinserted in the support ring 17 and is now formed to form a (new) active grinding layer on the base body 14 or the carrier layer 12 or the fabric pad 13 available.
  • a cylindrical body is thus obtained with inwardly directed ribs, which enclose depressions 11B between them, which define the later shape of the grinding knobs of the grinding-active layer 11.
  • the support part 17 and the negative mold 18 are fastened on a ring 24.
  • this ring 24 is aligned on the one hand with the inner edges of the webs or ribs 11C remaining between the recesses 11B and on the other hand fits over the base body formed from the core 14, carrier layer 12 and fabric support 13 in the sense that the negative mold 18, support part 17 and retaining ring 24 unit formed can be pushed onto the base body.
  • the base body is clamped on the plate 22 of a vibration table with the aid of a bolt 19, nuts 21 and an auxiliary plate 20 which is guided through the bore 15.
  • the lower peripheral edge of the holding plate 20 corresponds to the upper edge of the negative mold 18, in addition, the holding plate 20 is frustoconical in such a way that a downwardly tapering, annular space is formed between the conical jacket and the negative mold 18, which in the positioning of the two shown in Figure 8 Allows aggregates access to the bottom row of wells 11B.
  • the abrasive grain binder mixture is now distributed into this gap between the auxiliary plate 20 and the negative mold 18 and liquefied by vibration of the vibration table, so that the abrasive grain binder mixture first fills this lowermost row of depressions 11B of the negative mold 18.
  • the negative mold 18 is now lowered with the support part 17, with further refilling of abrasive grain binder mixture 23 (FIG. 9) until all the depressions 11B of the negative mold 18 are filled and these together with the ring 24 in the corresponding annular groove 24A of the table top 22 touches down.
  • the supporting part 17 is first removed and then the negative mold 18 is removed from the now finished abrasive body, in which case the hardened abrasive grain binder mixture 23 then forms the active grinding layer 11 of the finished abrasive body consisting of individual abrasive nubs.
  • the outer layer of the fabric layer 13 can, for example, be abraded, provided with a fresh tissue wrap, and the method can then be used repeatedly for reapplying an abrasive layer.

Abstract

1. Method of manufacturing a resilient grinding body for grinding in conformity with a particular configuration, which grinding body includes a carrier layer and an abrasive layer, which is applied to said carrier layer and is formed from free-standing abrasive knubs formed from a mixture of binding agent and abrasive grain, by the utilisation of a negative mould, which is insertable into a hollow-cylindrical supporting member and has inwardly orientated ribs and recesses interposed therebetween, for the production of the abrasive layer, characterised in that the hollow-cylindrical supporting member (17), together with the negative mould (18), is so disposed above a cylindrical basic body, formed from a core (14) and the carrier layer (12) applied to said core, that initially the lower internal edge of the internal circumferential face of the negative mould (18) containing the internal edges of the ribs (11C) coincides with the outer upper edge of the carrier layer (12), in that subsequently, commencing with the lowermost recesses (11B) of the negative mould (18), said recesses are filled with the mixture of binding agent and abrasive grain (23), whereby, depending on the level of filling, the negative mould (18) is continuously or stepwisely lowered over the basic body such that the filled recesses (11B) are sealed by the circumferential face of the carrier layer (12), and in that, after the mixture of binding agent and abrasive grain (23) has hardened, the supporting member (17) is removed, together with the negative mould (18), from the abrasive layer (11) which has thus been produced.

Description

Die Anmeldung betrifft ein Verfahren zur Herstellung eines elasti­schen Schleifkörpers zum formfolgenden Schleifen, der aus einer Trägerschicht und einer darauf aufgebrachten schleifaktiven Schicht aus freistehenden Schleifnoppen aus einem Bindemittel-­Schleifkorngemisch besteht, unter Verwendung einer in ein Stütz­teil einlegbaren Negativform zur Erzeugung der schleifaktiven Schicht.The application relates to a method for producing an elastic grinding body for shape-following grinding, which consists of a carrier layer and an active grinding layer applied thereon from free-standing grinding knobs made of a binder-grinding grain mixture, using a negative mold which can be inserted into a support part to produce the grinding active layer.

Schleifkörper der genannten Art sind beispielsweise aus der EP-A 0095 055 und der EP-A 0114 280 bekannt. Die derart herge­stellten Schleifkörper haben unter anderem den Nachteil, daß nach Abnutzung der Schleifschicht der restliche Körper (Kern mit aufliegender Elastomerschicht) zumindest teilweise unbrauch­bar geworden ist. Daraus folgt mithin, daß ca. 80 bis 90 Ge­wichtsprozent des Schleifmittels verloren sind und einer ent­sprechenden Deponie zugeführt werden müssen. Diesen gravierenden Mangel haben auch die bisher verwendeten Schleifbänder und solche bekannten Schleifkörper für das formfolgende Schleifen, die hart gebundene Schleifkornkonglomerate in einer elastomeren Matrix eingebettet enthalten.Abrasive bodies of the type mentioned are known, for example, from EP-A 0095 055 and EP-A 0114 280. The abrasive bodies produced in this way have the disadvantage, among other things, that after the abrasive layer has worn out, the rest of the body (core with the elastomer layer lying thereon) has at least partially become unusable. It therefore follows that approximately 80 to 90 percent by weight of the abrasive is lost and must be sent to a corresponding landfill. This serious deficiency is also present in the grinding belts used to date and those known grinding wheels for shape-following grinding, which contain hard-bonded abrasive grain conglomerates embedded in an elastomeric matrix.

Aufgabe der Erfindung ist es daher, ein Verfahren anzugeben, mit dem derartige Schleifkörper sowohl einfacher und besser hergestellt werden können, als auch Restkörper (Kern mit Elastomerschicht) nach Abnutzung der Schleifkornschicht wieder neu belegt werden können.The object of the invention is therefore to provide a method with which such abrasive bodies can be produced more easily and better, and residual bodies (core with elastomer layer) can be re-coated after the abrasive grain layer has worn out.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß das kreisringförmige Stützteil mit der Negativform so über einem aus einem Kern und der auf diesem aufgebrachten Trägerschicht gebildeten Grundkörper angeordnet wird, daß die unteren Innen­kanten der Negativform mit der äußeren Oberkante der Trägerschicht zusammenfallen, daß darauf, beginnend mit den zuunterst liegenden Vertiefungen der Negativform diese mit dem Bindemittel-Schleif­korngemisch ausgegossen werden, wobei entsprechend der Füllhöhe die Negativform kontinuierlich oder schrittweise so weit abge­senkt wird, daß die aufgefüllten Vertiefungen von der Träger­schicht verschlossen werden, und daß nach Aushärtung des Binde­mittel-Schleifkorngemisches das Stützteil mit der Negativform von der derart erzeugten schleifaktiven Schicht abgenommen wird.According to the invention, this object is achieved in that the annular support part with the negative form is arranged over a base body formed from a core and the carrier layer applied thereon, in such a way that the lower inner edges of the negative form coincide with the outer upper edge of the carrier layer, starting with The depressions at the bottom of the negative mold are poured out with the binder-abrasive grain mixture, the negative mold being lowered continuously or step by step to such an extent that the filled-in depressions are closed by the backing layer, and after the binder-abrasive grain mixture has hardened, the supporting part is cured the negative form is removed from the grinding-active layer produced in this way.

Der Erfindungsgedanke besteht also darin, daß die Kerne der Schleifkörper mit der Elastomerschicht mehrfach verwendet werden können, so daß neben einer Reduzierung der Schleifkosten auch eine geringere Umweltbelastung durch nicht mehr verwendbare Schleifkörperkerne erreicht wird.The idea of the invention is therefore that the cores of the grinding wheels with the elastomer layer can be used several times, so that, in addition to reducing the grinding costs, a lower environmental impact is achieved by grinding wheel cores that can no longer be used.

Gemäß einer vorteilhaften Ausgestaltung ist vorgesehen, daß das Schleifkorn-Bindemittelgemisch strukturviskos ist und zum Ausgießen der Vertiefungen der Negativform in Vibration ver­setzt und dadurch verflüssigt wird, ferner ist vorgesehen, daß vor der Befüllung mit dem Bindemittel-Schleifkorngemisch auf der Trägerschicht eine Gewebeauflage aufgebracht wird.According to an advantageous embodiment, it is provided that the abrasive grain-binder mixture is structurally viscous and is vibrated to pour out the recesses of the negative mold and is thereby liquefied, and it is further provided that a fabric pad is applied to the carrier layer before filling with the binder abrasive grain mixture.

Die Gewebeauflage kann zweckmäßigerweise aus zwei Wickeln eines reißfesten, synthetischen Gewebes bestehen, das mit einem geeig­neten elastomeren Bindemittel fest mit dem Grundkörper verbunden wird. Nach der Rückkehr eines solchen Körpers mit verbrauchter Schleifschicht wird der äußere der beiden Gewebewickel abge­schliffen, mit einem frischen Gewebewickel versehen und steht dann zur Neubelegung mit einer Schleifkornschicht zur Verfügung.The fabric cover can expediently consist of two coils of a tear-resistant, synthetic fabric which is firmly connected to the base body with a suitable elastomeric binder. After the return of such a body with a worn abrasive layer, the outer of the two fabric wraps is sanded, provided with a fresh fabric wrap and is then available for re-use with an abrasive grain layer.

Grundsätzlich kann die Herstellung der Schleifkornschicht von allen bekannten Schleifkorn-Bindemittelmischungen ausgehen, beispielsweise auch auf Epoxid- oder Polyesterharz-Basis, beson­ders vorteilhaft erweist sich jedoch die Verwendung einer Schleif­korn-Bindemittelmischung gemäß der EP-A 0 114 280 , die durch Vibration verflüssigt werden kann. Wegen der außerordentlich guten Haftfestigkeit dieser Bindung auf dem Gewebewickel kann die aktive Schleifschicht dabei bis über 20 mm hoch sein, im Gegensatz zu den oben genannten bekannten Verfahren mehr als eine Verdoppelung. Dadurch ergeben sich Standzeiten, die mindestens gleich sind denjenigen, wie sie von den bekannten Konglomerat­scheiben erreicht werden, wobei letztere jedoch nicht nur in der Herstellung aufwendiger sind, sondern auch nach Abnutzung der Schleifschicht nicht mehr neu belegt werden können und außer­dem nicht ölbeständig sind. Dadurch ergeben sich für die außer­ordentlich chemikalien- und ölbeständigen Schleifkörper, die erfindungsgemäß hergestellt wurden, auch dort Einsatzgebiete, wo mit Öl, Emulsionen oder halbsynthetischen Kühlmitteln ge­schliffen wird.In principle, the production of the abrasive grain layer can start from all known abrasive grain binder mixtures, for example also based on epoxy or polyester resin, but it has proven particularly advantageous to use an abrasive grain binder mixture according to EP-A 0 114 280, which can be liquefied by vibration . Because of the extraordinarily good adhesive strength of this bond on the fabric roll, the active grinding layer can be up to 20 mm high, in contrast to the known methods mentioned above, more than doubling. This results in service lives that are at least the same as those achieved by the known conglomerate disks, but the latter are not only more complex to manufacture, but can also no longer be reapplied after the abrasive layer has worn out and are also not oil-resistant. This results in areas of application for the extraordinarily chemical and oil-resistant abrasive articles which have been produced according to the invention, wherever grinding is carried out with oil, emulsions or semi-synthetic coolants.

Darüberhinaus ist es möglich, beim erfindungsgemäßen Verfahren Hochdruckschmiermittel in die strukturviskose Schleifkorn-Binde­mittelmischung zuzugeben, wodurch das Abgleiten der Metallspäne an den Schleifkornflächen außerordentlich günstig beeinflußt wird, dies führt zu höheren Durchlaufgeschwindigkeiten bei den Schleifmaschinen und erhöht die Effizienz der erfindungsgemäß hergestellten Schleifkörper.In addition, it is possible in the process according to the invention to add high-pressure lubricants to the structurally viscous abrasive grain / binder mixture, which has an extremely favorable influence on the sliding of the metal chips on the abrasive grain surfaces, which leads to higher throughput speeds in the grinding machines and increases the efficiency of the abrasive articles produced according to the invention.

Ein Ausführungsbeispiel eines mit dem erfindungsgemäßen Her­stellungsverfahren erzeugten Schleifkörpers und einer dazu ver­wendeten Vorrichtung wird anhand von Zeichnungen näher erläutert. Es zeigen:

  • Figur 1: Einen Querschnitt durch den Schleifkörper in der Ebene A-B der Figur 2,
  • Figur 2: eine Hälfte des Schleifkörpers gemäß Figur 1 in der Seitenansicht,
  • Figuren 3-6: jeweils einen Ausschnitt aus Oberflächenansich­ten des Schleifkörpers gemäß den Figuren 1 und 2 mit verschiedener Gestaltung der schleifaktiven Oberfläche (Schleifnoppen).
An embodiment of a grinding wheel produced with the manufacturing method according to the invention and a device used for this purpose will be explained in more detail with reference to drawings. Show it:
  • FIG. 1: a cross section through the grinding wheel in the plane AB of FIG. 2,
  • FIG. 2: a side view of one half of the grinding wheel according to FIG. 1,
  • FIGS. 3-6: in each case a section of surface views of the grinding body according to FIGS. 1 and 2 with different designs of the grinding-active surface (grinding knobs).

Die Figuren 1 und 2 zeigen einen Schleifkörper, wie er durch das erfindungsgemäße Verfahren herstellbar bzw. regenerierbar ist. Er ist radförmig aufgebaut, sein Umfangsbereich wird von der schleifaktiven Schicht 11 in Form von Schleifnoppen gebildet, die voneinander vollständig getrennt sind, so daß sie sich auf der darunter liegenden, aus einem massiven oder geschäumten Elastomer gebildeten Trägerschicht 12 individuell bewegen, d.h. dem jewei­ligen Schleifuntergrund anpassen können. Zwischen Trägerschicht 12 und schleifaktiver Schicht 11 ist eine Gewebeschicht 13 vorgesehen, die beispielsweise aus zwei Gewebewickeln bestehen kann.Figures 1 and 2 show an abrasive body, as it can be produced or regenerated by the inventive method. It is constructed in a wheel shape, its peripheral area is formed by the active grinding layer 11 in the form of grinding knobs which are completely separated from one another so that they move individually on the underlying carrier layer 12 formed from a solid or foamed elastomer, ie the respective grinding surface can adjust. Between the backing layer 12 and the grinding-active layer 11 is a fabric layer 13 provided, which may consist of two fabric wraps, for example.

Der innere Teil des Schleifkörpers besteht schließlich aus einem harten Kern 14 mit einer zentralen Bohrung 15.The inner part of the grinding wheel finally consists of a hard core 14 with a central bore 15.

Die Oberflächengestaltung, d.h. die Querschnittgestaltung der Schleifnoppen der schleifaktiven Schicht 11 kann auf den jeweili­gen Anwendungszweck des Schleifrades abgestimmt sein und bei­spielsweise die in den Figuren 3 bis 6 angedeutete Gestalt haben, wobei insbesondere das Verhältnis von Schleifnoppen und Zwischen­räumen für die jeweilige Schleifaufgabe von Bedeutung ist.The surface design, i.e. the cross-sectional design of the grinding nubs of the grinding active layer 11 can be adapted to the particular application of the grinding wheel and, for example, have the shape indicated in FIGS. 3 to 6, the ratio of grinding nubs and interspaces being particularly important for the respective grinding task.

Der Grundgedanke des erfindungsgemäßen Verfahrens besteht nun darin, die äußere schleifaktive Schicht 11, also die Schleif­noppen, nicht nur erstmalig auf den aus Trägerschicht 12 und Kern 14 bestehenden Grundkörper aufzubringen, sondern nach ihrer Abnutzung immer wieder neu auf den Grundkörper aufzubringen, also sozusagen eine "Runderneuerung" der schleifaktiven Schicht 11 zu ermöglichen.The basic idea of the method according to the invention is now not only to apply the outer grinding-active layer 11, that is to say the grinding nubs, for the first time to the base body consisting of carrier layer 12 and core 14, but also to apply it again and again to the base body after its wear, that is to say a " To allow retreading "of the active grinding layer 11.

Die Figuren 7-9 zeigen die zur Durchführung dieses Verfahrens vorgesehenen Vorrichtungen, unter Bezugnahme auf diese Figuren wird das erfindungsgemäße Verfahren nun erläutert:FIGS. 7-9 show the devices provided for carrying out this method; the method according to the invention is now explained with reference to these figures:

Die Herstellung des Grundkörpers, bestehend aus dem Kern 14 mit Bohrung 15 und der Trägerschicht 12 mit der Gewebeschicht 13 erfolgt nach bekannten Verfahren, beispielsweise gemäß den oben genannten Veröffentlichungen, und braucht nicht besonders erläutert zu werden.The basic body, consisting of the core 14 with a bore 15 and the carrier layer 12 with the fabric layer 13, is produced by known methods, for example in accordance with the publications mentioned above, and does not need to be explained in particular.

Zur Erzeugung der schleifaktiven Schicht 11 wird zunächst ein Grundkörper 16 (Figur 7) aus Holz, Metall, Kunststoff oder anderem geeigneten Material hergestellt, dessen Oberflächengestaltung der Oberflächengestaltung der späteren schleifaktiven Schicht 11 entspricht bzw. diese vorgibt, also beispielsweise entsprechend den Figuren 3-6. Den Schleifnoppen der schleifaktiven Schicht 11 entsprechen also formmäßig die Noppen 11A des Grundkörpers 16.To produce the grinding-active layer 11, a base body 16 (FIG. 7) is first produced from wood, metal, plastic or another suitable material, the surface design of which corresponds to or specifies the surface design of the later grinding-active layer 11, for example accordingly Figures 3-6. The knobs 11A of the base body 16 therefore correspond in shape to the knobs of the active grinding layer 11.

Dieser Grundkörper bildet also eine Positivform, die immer wieder benutzt werden kann, um daraus eine elastische Negativform 18 abzugießen, wobei beispielsweise Silikonkautschuk als Material für die Negativform 18 verwendet wird, der in den Zwischenraum zwischen dem Grundkörper 16 und einem äußeren ringförmigen Stütz­teil 17 ausgegossen wird.This base body thus forms a positive mold that can be used again and again to cast an elastic negative mold 18 therefrom, for example silicone rubber being used as the material for the negative mold 18, which is poured into the space between the base body 16 and an outer annular support part 17 .

Nach dem Aushärten der Negativform 18 wird der Stützring 17 abgezogen, die Negativform 18 wird an einer Stelle ihres Umfanges aufgeschnitten und von der Positivform (Grundkörper 16) abge­zogen, danach wird die Negativform 18 wieder in den Stützring 17 eingesetzt und steht nun zur Bildung einer (neuen) schleif­aktiven Schicht auf dem Grundkörper 14 bzw. der Trägerschicht 12 oder der Gewebeauflage 13 zur Verfügung.After the negative mold 18 has hardened, the support ring 17 is pulled off, the negative mold 18 is cut open at one point on its circumference and pulled off the positive mold (base body 16), after which the negative mold 18 is reinserted in the support ring 17 and is now formed to form a ( new) active grinding layer on the base body 14 or the carrier layer 12 or the fabric pad 13 available.

Man erhält also einen zylinderförmigen Körper mit nach innen gerichteten Rippen, die zwischen sich Vertiefungen 11B ein­schließen, die die spätere Form der Schleifnoppen der schleif­aktiven Schicht 11 vorgeben. Das Stützteil 17 und die Negativform 18 sind auf einem Ring 24 befestigt.A cylindrical body is thus obtained with inwardly directed ribs, which enclose depressions 11B between them, which define the later shape of the grinding knobs of the grinding-active layer 11. The support part 17 and the negative mold 18 are fastened on a ring 24.

Die Innenumfangsfläche dieses Rings 24 fluchtet einerseits mit den Innenkanten der zwischen den Vertiefungen 11B verbleibenden Stege oder Rippen 11C und paßt andererseits über den aus Kern 14, Trägerschicht 12 und Gewebeauflage 13 gebildeten Grundkörper in dem Sinne, daß die aus Negativform 18, Stützteil 17 und Halte­ring 24 gebildete Einheit auf den Grundkörper aufschiebbar ist. Der Grundkörper ist mit Hilfe eines durch die Bohrung 15 ge­führten Bolzens 19, Muttern 21 und einer Hilfsplatte 20 auf der Platte 22 eines Vibrationstisches aufgespannt.The inner circumferential surface of this ring 24 is aligned on the one hand with the inner edges of the webs or ribs 11C remaining between the recesses 11B and on the other hand fits over the base body formed from the core 14, carrier layer 12 and fabric support 13 in the sense that the negative mold 18, support part 17 and retaining ring 24 unit formed can be pushed onto the base body. The base body is clamped on the plate 22 of a vibration table with the aid of a bolt 19, nuts 21 and an auxiliary plate 20 which is guided through the bore 15.

Die untere Umfangskante der Halteplatte 20 entspricht dabei der Oberkante der Negativform 18, außerdem ist die Halteplatte 20 kegelstumpfförmig ausgebildet, derart, daß sich zwischen Kegelmantel und Negativform 18 ein nach unten verjüngender, ringförmiger Zwischenraum bildet, der in der in Figur 8 darge­stellten Positionierung der beiden Aggregate den Zugang zu der untersten Reihe von Vertiefungen 11B gestattet.The lower peripheral edge of the holding plate 20 corresponds to the upper edge of the negative mold 18, in addition, the holding plate 20 is frustoconical in such a way that a downwardly tapering, annular space is formed between the conical jacket and the negative mold 18, which in the positioning of the two shown in Figure 8 Allows aggregates access to the bottom row of wells 11B.

In diesen Spalt zwischen der Hilfsplatte 20 und der Negativform 18 wird nun die Schleifkorn-Bindemittelmischung verteilt und durch Vibration des Vibrationstisches verflüssigt, so daß die Schleifkorn-Bindemittelmischung zunächst diese unterste Reihe der Vertiefungen 11B der Negativform 18 ausfüllt. Nach und nach wird nun die Negativform 18 mit dem Stützteil 17 abgesenkt, unter weiterem Nachfüllen von Schleifkorn-Bindemittelmischung 23 (Figur 9) bis alle Vertiefungen 11B der Negativform 18 gefüllt sind und diese zusammen mit dem Ring 24 in der entsprechenden Ringnut 24A der Tischplatte 22 aufsetzt. Nach dem Aushärten der Schleifkorn-Bindemittelmischung 23 wird zunächst das Stützteil 17 abgezogen und danach die Negativform 18 vom den nun fertigen Schleifkörper abgenommen, bei dem dann die erhärtete Schleifkorn-­Bindemittelmischung 23 die aus einzelnen Schleifnoppen bestehende schleifaktive Schicht 11 des fertigen Schleifkörpers bilden.The abrasive grain binder mixture is now distributed into this gap between the auxiliary plate 20 and the negative mold 18 and liquefied by vibration of the vibration table, so that the abrasive grain binder mixture first fills this lowermost row of depressions 11B of the negative mold 18. Gradually, the negative mold 18 is now lowered with the support part 17, with further refilling of abrasive grain binder mixture 23 (FIG. 9) until all the depressions 11B of the negative mold 18 are filled and these together with the ring 24 in the corresponding annular groove 24A of the table top 22 touches down. After the abrasive grain binder mixture 23 has hardened, the supporting part 17 is first removed and then the negative mold 18 is removed from the now finished abrasive body, in which case the hardened abrasive grain binder mixture 23 then forms the active grinding layer 11 of the finished abrasive body consisting of individual abrasive nubs.

Nach der Abnutzung der schleifaktiven Schicht 11 kann dann bei­spielsweise die äußere Lage der Gewebeschicht 13 abgeschliffen werden, mit einem frischen Gewebewickel versehen werden und das Verfahren kann dann wiederholt zur Neubelegung mit einer schleifaktiven Schicht angewendet werden.After the abrasion-active layer 11 has worn, the outer layer of the fabric layer 13 can, for example, be abraded, provided with a fresh tissue wrap, and the method can then be used repeatedly for reapplying an abrasive layer.

Claims (5)

1. Verfahren zur Herstellung eines elastischen Schleifkörpers zum formfolgenden Schleifen, der aus einer Trägerschicht und einer darauf aufgebrachten schleifaktiven Schicht aus freistehenden Schleifnoppen aus einem Bindemittel-Schleifkorn­gemisch besteht, unter Verwendung einer in ein Stützteil einlegbaren Negativform zur Erzeugung der schleifaktiven Schicht,
dadurch gekennzeichnet, daß das kreisringförmige Stützteil (17) mit der Negativform (18) so über einem aus einem Kern (14) und der auf diesem aufgebrachten Trägerschicht (12) gebildeten Grundkörper angeordnet wird, daß die unteren Innen­kanten der Negativform (18), der Rippen (11C) mit der äußeren Oberkante der Trägerschicht (12) zusammenfallen, daß darauf, beginnend mit den zuunterst liegenden Vertiefungen (11B) der Negativform (18), diese mit dem Bindemittel-Schleifkorn­gemisch (23) ausgegossen werden, wobei entsprechend der Füll­höhe die Negativform (18) kontinuierlich oder schrittweise so weit abgesenkt wird, daß die aufgefüllten Vertiefungen (11B) von der Trägerschicht (12) verschlossen werden, und daß nach Aushärtung des Bindemittel-Schleifkorngemisches (23) das Stützteil (17) mit der Negativform (18) von der derart erzeugten schleifaktiven Schicht (11) abgenommen wird.1. A method for producing an elastic abrasive body for shape-following grinding, which consists of a backing layer and an active grinding layer of free-standing grinding knobs made of a binder-abrasive grain mixture applied thereon, using a negative mold which can be inserted into a support part to produce the grinding active layer,
characterized in that the annular support part (17) with the negative mold (18) is arranged over a base body formed from a core (14) and the carrier layer (12) applied thereon, that the lower inner edges of the negative mold (18), the Ribs (11C) coincide with the outer upper edge of the carrier layer (12), that, starting with the lowest depressions (11B) of the negative mold (18), these are poured out with the binder-abrasive grain mixture (23), the according to the filling level The negative mold (18) is continuously or gradually lowered until the filled-in depressions (11B) are closed by the carrier layer (12) and that after the binder-abrasive grain mixture (23) has hardened, the support part (17) with the negative mold (18) is removed from the grinding active layer (11) thus produced. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schleifkorn-Bindemittelgemisch (23) strukturviskos ist und zum Ausgießen der Vertiefungen (11B) der Negativform (18) in Vibration versetzt und dadurch verflüssigt wird.2. The method according to claim 1, characterized in that the abrasive grain binder mixture (23) is structurally viscous and for pouring out the depressions (11B) of the negative mold (18) set in vibration and thereby liquefied. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß vor der Befüllung mit dem Bindemittel-Schleifkorngemisch (23) auf der Trägerschicht (12) eine Gewebeauflage (13) aufgebracht wird.3. The method according to claim 1, characterized in that before the filling with the binder-abrasive grain mixture (23) on the carrier layer (12), a fabric pad (13) is applied. 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 2 und 3, gekennzeichnet durch einen Vibrationstisch (22), auf den der Grundkörper spannbar ist, und eine von oben auf den Grundkörper aufsetzbare und fixierbare Halteplatte (20).4. Apparatus for carrying out the method according to claim 2 and 3, characterized by a vibration table (22) on which the base body can be clamped, and a holding plate (20) which can be placed and fixed on the base body from above. 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die untere Umfangskante der Halteplatte (20) der Oberkante der Negativform (18) entspricht, und daß die Halteplatte (20) kegelstumpfförmig ausgebildet ist, derart, daß sich zwischen Kegelmantel und Negativform (18) ein nach unten verjüngender, ringförmiger Zwischenraum zur Einfüllung des Schleifkorn-Bindemittelgemisches (23) bildet.5. The device according to claim 4, characterized in that the lower peripheral edge of the holding plate (20) corresponds to the upper edge of the negative mold (18), and that the holding plate (20) is frustoconical, such that there is between the cone jacket and negative mold (18) forms a downwardly tapering, annular space for filling the abrasive grain binder mixture (23).
EP86105309A 1986-04-17 1986-04-17 Method of manufacturing an elastic grinding body Expired - Lifetime EP0242410B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP86105309A EP0242410B1 (en) 1986-04-17 1986-04-17 Method of manufacturing an elastic grinding body
DE8686105309T DE3671712D1 (en) 1986-04-17 1986-04-17 METHOD FOR PRODUCING AN ELASTIC GRINDING BODY.
AT86105309T ATE53324T1 (en) 1986-04-17 1986-04-17 PROCESS FOR MANUFACTURING AN ELASTIC ABRASIVE BODY.

Applications Claiming Priority (1)

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EP86105309A EP0242410B1 (en) 1986-04-17 1986-04-17 Method of manufacturing an elastic grinding body

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EP0242410A1 true EP0242410A1 (en) 1987-10-28
EP0242410B1 EP0242410B1 (en) 1990-06-06

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AT (1) ATE53324T1 (en)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0688635A1 (en) * 1994-05-23 1995-12-27 GHINES S.r.l. A banded grinder for working edges of slabs of marble, granite and the like
CN105751086A (en) * 2016-05-05 2016-07-13 珠海市巨海科技有限公司 Metal bond grinding tool and manufacturing method thereof
CN109202578A (en) * 2017-07-05 2019-01-15 常州市岚钨合金有限公司 A kind of wheeled polishing system of the frosted on floor
CN110977798A (en) * 2018-10-02 2020-04-10 株式会社迪思科 Method for manufacturing grinding wheel
EP4010160A4 (en) * 2019-08-07 2023-05-03 Saab Ab A mould tool assembly

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105945738A (en) * 2016-05-05 2016-09-21 珠海市巨海科技有限公司 Resin binder grinding tool and manufacturing method thereof
CN105729318A (en) * 2016-05-05 2016-07-06 珠海市巨海科技有限公司 Grinding wheel for polishing and grinding ceramic tile biscuit, manufacturing method of grinding wheel and polishing and grinding apparatus and polishing and grinding method for ceramic tile biscuit
CN111515872B (en) * 2020-04-10 2022-01-11 广东大市智能装备有限公司 Powder metallurgy integrated forming method for hollow diamond

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GB498951A (en) * 1937-01-12 1939-01-17 Norton Grinding Wheel Co Ltd Composite grinding wheel and method of making the same
FR1142688A (en) * 1956-02-15 1957-09-20 Advanced abrasive tool and its manufacturing process
DE2341329A1 (en) * 1973-08-16 1975-03-13 Wilhelm H Spira Finish machining of toric faces - uses a plastic shell with toric working face selectively coated with working material
EP0095055A2 (en) * 1982-05-25 1983-11-30 Dr. Elbel Schleifmittel GmbH Method of manufacturing an abrasive body
EP0114280A2 (en) * 1983-01-21 1984-08-01 Carborundum Schleifmittelwerke GmbH Method of manufacturing abrasive bodies
US4523930A (en) * 1984-08-06 1985-06-18 Norton Company Method of manufacturing composite grinding wheel
EP0147633A2 (en) * 1983-12-24 1985-07-10 Dr. Elbel Schleifmittel GmbH Method of manufacturing elastic grinding bodies

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB498951A (en) * 1937-01-12 1939-01-17 Norton Grinding Wheel Co Ltd Composite grinding wheel and method of making the same
FR1142688A (en) * 1956-02-15 1957-09-20 Advanced abrasive tool and its manufacturing process
DE2341329A1 (en) * 1973-08-16 1975-03-13 Wilhelm H Spira Finish machining of toric faces - uses a plastic shell with toric working face selectively coated with working material
EP0095055A2 (en) * 1982-05-25 1983-11-30 Dr. Elbel Schleifmittel GmbH Method of manufacturing an abrasive body
EP0114280A2 (en) * 1983-01-21 1984-08-01 Carborundum Schleifmittelwerke GmbH Method of manufacturing abrasive bodies
EP0147633A2 (en) * 1983-12-24 1985-07-10 Dr. Elbel Schleifmittel GmbH Method of manufacturing elastic grinding bodies
US4523930A (en) * 1984-08-06 1985-06-18 Norton Company Method of manufacturing composite grinding wheel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0688635A1 (en) * 1994-05-23 1995-12-27 GHINES S.r.l. A banded grinder for working edges of slabs of marble, granite and the like
CN105751086A (en) * 2016-05-05 2016-07-13 珠海市巨海科技有限公司 Metal bond grinding tool and manufacturing method thereof
CN109202578A (en) * 2017-07-05 2019-01-15 常州市岚钨合金有限公司 A kind of wheeled polishing system of the frosted on floor
CN110977798A (en) * 2018-10-02 2020-04-10 株式会社迪思科 Method for manufacturing grinding wheel
EP4010160A4 (en) * 2019-08-07 2023-05-03 Saab Ab A mould tool assembly

Also Published As

Publication number Publication date
DE3671712D1 (en) 1990-07-12
ATE53324T1 (en) 1990-06-15
EP0242410B1 (en) 1990-06-06

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