EP2623264A2 - Grinding wheel, in particular for longitudinal or transverse grinding - Google Patents

Grinding wheel, in particular for longitudinal or transverse grinding Download PDF

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Publication number
EP2623264A2
EP2623264A2 EP13151133.9A EP13151133A EP2623264A2 EP 2623264 A2 EP2623264 A2 EP 2623264A2 EP 13151133 A EP13151133 A EP 13151133A EP 2623264 A2 EP2623264 A2 EP 2623264A2
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EP
European Patent Office
Prior art keywords
grinding
grinding wheel
section
abrasive
wheel according
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EP13151133.9A
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German (de)
French (fr)
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EP2623264A3 (en
EP2623264B1 (en
Inventor
Egon Evertz
Ralf Evertz
Stefan Evertz
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Egon Evertz KG GmbH and Co
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Egon Evertz KG GmbH and Co
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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
    • B24D5/02—Wheels in one piece
    • B24D5/04—Wheels in one piece with reinforcing means
    • 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
    • B24D3/001—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 supporting member
    • 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
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
    • 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
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
    • B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic
    • 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
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B24D5/08—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with reinforcing means
    • 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
    • B24D5/14—Zonally-graded wheels; Composite wheels comprising different abrasives

Definitions

  • the invention relates to a grinding wheel, in particular for longitudinal or transverse grinding, with an inner core portion and an outer annular grinding portion, which are connected to each other, wherein the grinding portion consists of a granular abrasive material.
  • a grinding wheel of this type is used for example in the DE 601 13 319 T2 described.
  • the surface is processed by grinding, in order to remove any defects there, such as voids.
  • a grinding wheel is used, the grinding section contains grains as abrasives, with which a machining with geometrically indeterminate cutting is feasible.
  • the choice of the abrasive grains depends on the workpiece to be machined, usually the abrasive grains should have a high hardness, a sufficient toughness and heat resistance and a suitable grain size and grain shape.
  • Frequently used abrasive grains are made of corundum (alumina), silicon carbide, cubic boron nitride, or diamond, and the above-mentioned abrasive materials are mentioned in order of increasing hardness.
  • the shape of the abrasive grains and their particle sizes depend on the type of processing, namely whether it is a so-called rough grinding, rough grinding or finish grinding or Feinstschleifen.
  • the grinding wheel is rotated at a relatively high speed during the grinding process, whereby grinding speeds of 80 m / s or more are usual. Such grinding speeds result in considerable centrifugal forces, which require high safety measures.
  • a particular danger to the operating staff is the relatively high sensitivity to breakage of the grinding wheels, which can lead to detachment of individual large pieces of the grinding wheels or even grinding segment segments.
  • the necessary precautions namely a balance of the grinding wheel, a sound sample before use, a careful clamping of the grinding wheel and a housing in a protective hood, the durability of the grinding wheel comes a large Meaning too. In particular, the breaking off of individual abrasive section segments or larger abrasive section parts must be effectively avoided.
  • a grinding wheel according to claim 1 wherein according to the invention at least the grinding section, preferably the grinding section and the core section, based on the total mass of the grinding section 0.15% to 1%, preferably 0.2% to 0, 4%, plastic or glass fibers.
  • glass fibers having a length of 5 mm to 15 mm and a thickness of 0.8 mm to 1.2 mm are used.
  • the grinding wheels discussed here have a standardized diameter of 615 mm with a width of 79 mm and an inner bore in the middle of the core section of 203 mm.
  • the core section diameter is 340 mm.
  • the weight of such a grinding wheel including embedded iron reinforcement rings is about 63 kg.
  • the substantially cylindrical outer casing of the core section has individual grooves or singular recesses and the cylindrical inner casing of the grinding section has individual ribs or singular elevations.
  • the ribs or singular protrusions each engage in the grooves or singular depressions of the core portion, resulting in an effective "gearing" between the core portion and the abrasive portion.
  • the corresponding grooves, depressions or elevations can be easily formed in the cold pressing.
  • all common abrasives can be used in the context of the present invention, preferably Al 2 O 3 , SiC, CBN, ZrO 2 , diamond or mixtures of the abovementioned substances, wherein the grain size should be at most 1 mm in diameter.
  • the core section and the cutting section should each have the same thermal expansion coefficients. At most, the coefficients of expansion may differ by a maximum of 5%. By this measure it is achieved that during heating of the grinding wheel during operation stresses between the core region and the grinding section are largely avoided.
  • the core section and the abrasive section may, in principle, be made of the same material or of a different material, apart from the abrasive grain.
  • the abrasive section may comprise a metal or metal alloy matrix or a thermosetting resin, wherein the granular abrasives and the plastic or glass fibers are embedded in at least substantially homogeneous distribution.
  • the core section may consist essentially of metal or metal alloys, to which fillers are optionally added. In particular, under certain circumstances, the core section can be used several times, ie that after a wear of the grinding section of the abrasive section body separated from the core portion and then a new grinding section is formed.
  • the core portion (preferably as well as the abrasive portion) may include a thermosetting resin as well as crosslinking agents and fillers.
  • Fillers may be, for example, powdered SiC, Al 2 O 3 , bauxite, graphite or molybdenum sulfide.
  • the core section and then the cutting section are produced by cold pressing.
  • the thus-formed green body of core and abrasive section already has the grooves and ribs, the mesh in the manner of the tongue and groove principle (or alternatively, singular depressions and singular pin).
  • the contiguous green compact is finally heated to 180 ° C to 200 ° C and pressed to the desired final size.
  • the pressing pressures are for example 7 x 10 7 Pa (700 bar).
  • Grinding wheels of the type according to the invention consist of a core section 10 and a grinding section 11.
  • the outer diameter of the grinding section is 615 mm and the Fig. 2 apparent width of the grinding wheel 79 mm.
  • core portion 10 is disposed radially inward with its inner and outer surfaces abutting and interconnected.
  • Fig. 3 As can be seen, a type of gearing between the core portion and the abrasive portion can be provided by having the core portion having individual radially projecting ribs 12 which engage grooves 13 of the abrasive portion. Alternatively, and as shown in the left half of the grinding wheel, individual elevations 14 and depressions 15 can be used.
  • Such protrusions or grooves are already formed by pre-pressing in the manufacture of the green compact, so that the composite body, consisting of pre-pressed core section and pre-pressed grinding section placed in a mold and finally heated to 180 ° C to 200 ° C and pressed to a final size.
  • the abrasive section has, in addition to the matrix material, in which the abrasive grains, for example of aluminum oxide, embedded, a mass fraction of 0.15% to 1.0% plastic or glass fibers.
  • the abrasive grains for example of aluminum oxide
  • the abrasive grains for example of aluminum oxide
  • a mass fraction of 0.15% to 1.0% plastic or glass fibers about 100 g of glass fibers having an average length of 10 mm and a thickness of 1 mm were used as a total weight for the core section and the grinding section.
  • the glass fibers have been homogeneously mixed.
  • the core section had a total weight of 12 kg, whereas the abrasive section had a powder weight of 49.5 kg.
  • two additional iron rings have been embedded, the weight of which is 1.0 kg, resulting in a total weight of 62.5 kg for the grinding wheel.
  • the glass fiber content was approximately 0.17% of the weight of the abrasive section and the core section.
  • the grinding wheel was tested at speeds of 140 m / sec, without any breakouts of larger parts of the grinding section or hairline cracks, which could lead to later breakouts, being detected.
  • the targeted addition of the glass fibers can thus be achieved, in contrast to those grinding wheels whose grinding sections did not contain glass fibers, a significant improvement in the strength of the grinding wheel.

Abstract

The grinding wheel has an inner core section (10) and an outer annular grinding section (11) which are connected to each other. The annular grinding section is made of granular abrasive material. The grinding section is formed by an abrasive section and the core section including plastic or glass fibers based on the mass of the abrasive section. The grinding section is made of metal or metal alloy matrix, or contains a thermosetting resin, where the granular abrasive contains plastic or glass fibers. A curing agent is provided, which contains bauxite, graphite or molybdenum sulfide.

Description

Die Erfindung betrifft eine Schleifscheibe, insbesondere zum Längs- oder Querschleifen, mit einem inneren Kernabschnitt und einem äußeren ringförmigen Schleifabschnitt, die miteinander verbunden sind, wobei der Schleifabschnitt aus einem körniges Schleifmittel enthaltenen Material besteht. Eine Schleifscheibe dieser Art wird beispielsweise in der DE 601 13 319 T2 beschrieben.The invention relates to a grinding wheel, in particular for longitudinal or transverse grinding, with an inner core portion and an outer annular grinding portion, which are connected to each other, wherein the grinding portion consists of a granular abrasive material. A grinding wheel of this type is used for example in the DE 601 13 319 T2 described.

In der Stahlfertigung wird beispielsweise bei der Weiterverarbeitung von Brammen die Oberfläche durch Schleifen bearbeitet, um dort vorhandene Fehlstellen wie Lunker abzutragen. Hierzu wird eine Schleifscheibe verwendet, deren Schleifabschnitt Körner als Schleifmittel enthält, mit denen ein Spanen mit geometrisch unbestimmten Schneiden durchführbar ist. Die Wahl der Schleifkörner richtet sich nach dem zu bearbeitenden Werkstück, zumeist sollen die Schleifkörner eine große Härte, eine ausreichende Kornzähigkeit und Wärmebeständigkeit und eine geeignete Korngröße und Kornform besitzen. Häufig verwendete Schleifkörner bestehen aus Korund (Aluminiumoxid), Siliziumcarbid, kubischem Bornitrid oder aus Diamant, wobei die genannten Schleifmaterialien in der Reihenfolge mit wachsender Härte genannt sind. Die Form der Schleifkörner sowie deren Korngrößen richten sich nach der Art der Bearbeitung, nämlich ob es sich um ein sogenanntes Schruppschleifen, Vorschleifen oder Fertigschleifen bzw. Feinstschleifen handelt.In steel production, for example, in the further processing of slabs, the surface is processed by grinding, in order to remove any defects there, such as voids. For this purpose, a grinding wheel is used, the grinding section contains grains as abrasives, with which a machining with geometrically indeterminate cutting is feasible. The choice of the abrasive grains depends on the workpiece to be machined, usually the abrasive grains should have a high hardness, a sufficient toughness and heat resistance and a suitable grain size and grain shape. Frequently used abrasive grains are made of corundum (alumina), silicon carbide, cubic boron nitride, or diamond, and the above-mentioned abrasive materials are mentioned in order of increasing hardness. The shape of the abrasive grains and their particle sizes depend on the type of processing, namely whether it is a so-called rough grinding, rough grinding or finish grinding or Feinstschleifen.

Die Schleifscheibe wird beim Schleifvorgang mit relativ hoher Geschwindigkeit gedreht, wobei Schleifgeschwindigkeiten von 80m/s oder mehr üblich sind. Bei solchen Schleifgeschwindigkeiten entstehen erhebliche Fliehkräfte, die hohe Sicherheitsmaßnahmen erfordern. Eine besondere Gefahr für das Bedienungspersonal ergibt sich durch die relativ große Bruchempfindlichkeit der Schleifscheiben, die dazu führen kann, dass sich einzelne große Stücke der Schleifscheiben oder sogar Schleifabschnittsegmente ablösen. Trotzt notwendiger Sicherungsmaßnahmen, nämlich einer Auswuchtung der Schleifscheibe, einer Klangprobe vor der Benutzungsaufnahme, einer sorgfältigen Aufspannung der Schleifscheibe und einer Einhausung in einer Schutzhaube, kommt der Haltbarkeit der Schleifscheibe eine große Bedeutung zu. Insbesondere muss das Abbrechen einzelner Schleifabschnittsegmente oder größerer Schleifabschnittsteile wirkungsvoll vermieden werden.The grinding wheel is rotated at a relatively high speed during the grinding process, whereby grinding speeds of 80 m / s or more are usual. Such grinding speeds result in considerable centrifugal forces, which require high safety measures. A particular danger to the operating staff is the relatively high sensitivity to breakage of the grinding wheels, which can lead to detachment of individual large pieces of the grinding wheels or even grinding segment segments. Despite the necessary precautions, namely a balance of the grinding wheel, a sound sample before use, a careful clamping of the grinding wheel and a housing in a protective hood, the durability of the grinding wheel comes a large Meaning too. In particular, the breaking off of individual abrasive section segments or larger abrasive section parts must be effectively avoided.

Die vorstehend beschriebene Aufgabe wird durch eine Schleifscheibe nach Anspruch 1 gelöst, bei der erfindungsgemäß zumindest der Schleifabschnitt, vorzugsweise der Schleifabschnitt und der Kernabschnitt zusätzlich, bezogen auf die Gesamtmasse des Schleifabschnittes 0,15% bis 1 %, vorzugsweise 0,2% bis 0,4%, Kunststoff- oder Glasfasern aufweist.The object described above is achieved by a grinding wheel according to claim 1, wherein according to the invention at least the grinding section, preferably the grinding section and the core section, based on the total mass of the grinding section 0.15% to 1%, preferably 0.2% to 0, 4%, plastic or glass fibers.

Es ist zwar für Trennscheiben kleineren Durchmessers oder auch größeren Schleifscheiben bereits die Verwendung von Füllstoffen, unteren andrem von Glasfasern vorgeschlagen worden, jedoch wurde hiermit das Ziel verfolgt, die Kosten für die Schleifscheibe zu minimieren. Die Zentrifugalkraft einer Schleifscheibe berechnet sich aus dem Produkt der Masse, dem Quadrat der Winkelgeschwindigkeit sowie dem Abstand von der Drehachse, woraus folgt, dass insbesondere Schleifscheiben mit einer großen Masse sowie einem großen Durchmesser immense Fliehkräfte erfahren. Das Entstehen von Haarrissen als Auslöser eines späteren Abbrechens von Teilen der Schleifabschnitte ist somit zu vermeiden. Aus diesem Grund sind die prozentualen Massenanteile der Kunststoff- oder Glasfaser strikt einzuhalten. Oberhalb von 1,0 Massen% des Schleifabschnitts erhöht sich die Bruchgefahr drastisch. Unterhalb von 0,3% bleibt die Zugabe von Kunststoff- oder Glasfasern weitgehend wirkungslos. Erst die beschränkte Menge von 0,15% bis 1,0% führt im Ergebnis zum einen zu einem guten Haftverbund der Schleifscheibenabschnitte ohne Einbußen der Zähigkeit.While the use of fillers, lower glass fibers, has been suggested for smaller diameter or larger abrasive wheels, the goal has been to minimize the cost of the grinding wheel. The centrifugal force of a grinding wheel is calculated from the product of the mass, the square of the angular velocity and the distance from the axis of rotation, from which it follows that in particular grinding wheels with a large mass and a large diameter undergo immense centrifugal forces. The emergence of hairline cracks as a trigger of a later break off of parts of the grinding sections is thus to be avoided. For this reason, the percentages by weight of the plastic or glass fiber must be strictly adhered to. Above 1.0% by mass of the sanding section, the risk of breakage increases drastically. Below 0.3%, the addition of plastic or glass fibers remains largely ineffective. Only the limited amount of 0.15% to 1.0% results in a good adhesion of the grinding wheel sections without loss of toughness.

Vorzugsweise werden Glasfasern mit einer Länge von 5 mm bis 15 mm und einer Dicke von 0,8 mm bis 1,2 mm verwendet.Preferably, glass fibers having a length of 5 mm to 15 mm and a thickness of 0.8 mm to 1.2 mm are used.

Die hier angesprochenen Schleifscheiben besitzen beispielsweise einen standardisierten Durchmesser von 615 mm mit einer Breite von 79 mm und einer inneren Bohrung inmitten des Kernabschnittes von 203 mm. Der Kernabschnittsdurchmesser beträgt 340 mm. Das Gewicht einer solchen Schleifscheibe einschließlich eingebetteter Eisenverstärkungsringe beträgt ca. 63 kg. Um eine Relativbewegung des Kernabschnittes und des Schleifabschnittes in Drehrichtung zu vermeiden, weist der im Wesentlichen zylinderförmige Außenmantel des Kernabschnittes einzelne Nuten oder singuläre Vertiefungen auf und der zylinderförmige Innenmantel des Schleifabschnittes einzelne Rippen oder singuläre Erhebungen. Die Rippen oder singulären Erhebungen greifen jeweils in die Nuten oder singulären Vertiefungen des Kernabschnittes ein, wobei sich eine wirkungsvolle "Verzahnung" zwischen dem Kernabschnitt und dem Schleifabschnitt ergibt. Die entsprechenden Nuten, Vertiefungen oder Erhebungen können bei dem Kaltpressen leicht eingeformt werden.For example, the grinding wheels discussed here have a standardized diameter of 615 mm with a width of 79 mm and an inner bore in the middle of the core section of 203 mm. The core section diameter is 340 mm. The weight of such a grinding wheel including embedded iron reinforcement rings is about 63 kg. In order to avoid a relative movement of the core section and the grinding section in the direction of rotation, the substantially cylindrical outer casing of the core section has individual grooves or singular recesses and the cylindrical inner casing of the grinding section has individual ribs or singular elevations. The ribs or singular protrusions each engage in the grooves or singular depressions of the core portion, resulting in an effective "gearing" between the core portion and the abrasive portion. The corresponding grooves, depressions or elevations can be easily formed in the cold pressing.

Im Rahmen der vorliegenden Erfindung können prinzipiell alle gängigen Schleifmittel verwendet werden, vorzugsweise sind dies Al2O3, SiC, CBN, ZrO2, Diamant oder Mischungen aus den vorgenannten Stoffen, wobei die Korngröße maximal 1 mm Durchmesser betragen soll.In principle, all common abrasives can be used in the context of the present invention, preferably Al 2 O 3 , SiC, CBN, ZrO 2 , diamond or mixtures of the abovementioned substances, wherein the grain size should be at most 1 mm in diameter.

Wie prinzipiell aus der DE 601 13 319 T2 bekannt, sollen der Kernabschnitt und der Schneidabschnitt jeweils gleiche thermische Ausdehnungskoeffizienten haben. Allenfalls können die Ausdehnungskoeffizienten maximal 5% voneinander abweichen. Durch diese Maßnahme wird erreicht, dass bei der Erwärmung der Schleifscheibe im Betrieb Spannungen zwischen dem Kernbereich und dem Schleifabschnitt weitestgehend vermieden werden.How in principle from the DE 601 13 319 T2 As is known, the core section and the cutting section should each have the same thermal expansion coefficients. At most, the coefficients of expansion may differ by a maximum of 5%. By this measure it is achieved that during heating of the grinding wheel during operation stresses between the core region and the grinding section are largely avoided.

Der Kernabschnitt und der Schleifabschnitt können abgesehen von dem Schleifkorn prinzipiell aus demselben oder aus einem unterschiedlichen Material bestehen. Nach einer weiteren Ausgestaltung der Erfindung kann der Schleifabschnitt eine Metall-oder Metalllegierungsmatrix oder ein wärmeaushärtbares Harz enthalten, worin die körnigen Schleifmittel und die Kunststoff- oder Glasfasern in zumindest weitgehend homogener Verteilung eingebettet sind. Der Kernabschnitt kann im Wesentlichen aus Metall bzw. Metalllegierungen bestehen, denen gegebenenfalls Füllstoffe zugesetzt sind. Insbesondere kann unter Umständen der Kernabschnitt mehrfach genutzt werden, d. h. dass nach einem Verschleiß des Schleifabschnittes der Schleifabschnitt-Körper von dem Kernabschnitt getrennt und hierauf ein neuer Schleifabschnitt angeformt wird.The core section and the abrasive section may, in principle, be made of the same material or of a different material, apart from the abrasive grain. According to a further embodiment of the invention, the abrasive section may comprise a metal or metal alloy matrix or a thermosetting resin, wherein the granular abrasives and the plastic or glass fibers are embedded in at least substantially homogeneous distribution. The core section may consist essentially of metal or metal alloys, to which fillers are optionally added. In particular, under certain circumstances, the core section can be used several times, ie that after a wear of the grinding section of the abrasive section body separated from the core portion and then a new grinding section is formed.

Insbesondere im Hinblick auf zumindest etwa gleiche Wärmeausdehnungskoeffizienten kann jedoch der Kernabschnitt (vorzugsweise ebenso wie der Schleifabschnitt) ein wärmeaushärtbares Harz sowie eine Vernetzungsmittel und Füllstoffe enthalten. Füllstoffe können beispielsweise pulverförmiges SiC, Al2O3, Bauxit, Graphit oder Molybdänsulfid sein.However, particularly with regard to at least about the same coefficients of thermal expansion, the core portion (preferably as well as the abrasive portion) may include a thermosetting resin as well as crosslinking agents and fillers. Fillers may be, for example, powdered SiC, Al 2 O 3 , bauxite, graphite or molybdenum sulfide.

Um eine größtmögliche Festigkeit der Schleifscheibe gewährleisten zu können, wird vorzugsweise zunächst der Kernabschnitt und hierauf der Schneidabschnitt durch Kaltpressen hergestellt. Der derart geformte Grünling aus Kern- und Schleifabschnitt besitzt bereits die Nuten und Rippen, die nach Art des Nut-Feder-Prinzips ineinander greifen (oder alternativ hierzu singuläre Vertiefungen und singuläre Zapfen).In order to be able to ensure the greatest possible strength of the grinding wheel, preferably the core section and then the cutting section are produced by cold pressing. The thus-formed green body of core and abrasive section already has the grooves and ribs, the mesh in the manner of the tongue and groove principle (or alternatively, singular depressions and singular pin).

Der zusammenhängende Pressgrünling wird abschließend auf 180°C bis 200°C erwärmt und auf das gewünschte Endmaß gepresst. Die Pressdrucke liegen beispielsweise bei 7 x 107 Pa (700 bar).The contiguous green compact is finally heated to 180 ° C to 200 ° C and pressed to the desired final size. The pressing pressures are for example 7 x 10 7 Pa (700 bar).

Ein konkretes Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt. Es zeigen:

Fig. 1
eine Draufsicht auf eine Schleifscheibe,
Fig. 2
eine Seitenansicht der Schleifscheibe und
Fig. 3
eine Schnittansicht entlang der Linie III-III in Fig. 1 (mit zwei möglichen Ausführungsvarianten).
A concrete embodiment of the invention is shown in the drawings. Show it:
Fig. 1
a top view of a grinding wheel,
Fig. 2
a side view of the grinding wheel and
Fig. 3
a sectional view taken along the line III-III in Fig. 1 (with two possible variants).

Schleifscheiben der erfindungsgemäßen Art bestehen aus einem Kernabschnitt 10 sowie einem Schleifabschnitt 11. Der Außendurchmesser des Schleifabschnitts beträgt 615 mm und die aus Fig. 2 ersichtliche Breite der Schleifscheibe 79 mm. Der Schleifabschnitt 11 ist radial außen und der Kernabschnitt 10 radial innen angeordnet, wobei deren innere und äußere Mantelfläche aneinander liegen und miteinander verbunden sind. Wie aus Fig. 3 ersichtlich, kann eine Art Verzahnung zwischen dem Kernabschnitt und dem Schleifabschnitt dadurch geschaffen werden, dass der Kernabschnitt einzelne radial abstehende Rippen 12 besitzt, die in Nuten 13 des Schleifabschnittes eingreifen. Alternativ hierzu und wie in der linken Hälfte der Schleifscheibe dargestellt, können auch einzelne Erhebungen 14 und Vertiefungen 15 verwendet werden. Solche Vorsprünge oder Nuten werden bereits beim Herstellen des Grünlings durch Vorpressen eingeformt, so dass der zusammengesetzte Körper, bestehend aus vorgepresstem Kernabschnitt und vorgepresstem Schleifabschnitt in eine Form gegeben und abschließend auf 180°C bis 200°C erwärmt und auf ein Endmaß fertig gepresst werden.Grinding wheels of the type according to the invention consist of a core section 10 and a grinding section 11. The outer diameter of the grinding section is 615 mm and the Fig. 2 apparent width of the grinding wheel 79 mm. Of the Abrasive portion 11 is radially outward and core portion 10 is disposed radially inward with its inner and outer surfaces abutting and interconnected. How out Fig. 3 As can be seen, a type of gearing between the core portion and the abrasive portion can be provided by having the core portion having individual radially projecting ribs 12 which engage grooves 13 of the abrasive portion. Alternatively, and as shown in the left half of the grinding wheel, individual elevations 14 and depressions 15 can be used. Such protrusions or grooves are already formed by pre-pressing in the manufacture of the green compact, so that the composite body, consisting of pre-pressed core section and pre-pressed grinding section placed in a mold and finally heated to 180 ° C to 200 ° C and pressed to a final size.

Erfindungsgemäß besitzt der Schleifabschnitt neben dem Matrixmaterial, in welches die Schleifkörner, beispielsweise aus Aluminiumoxid, eingebettet sind, einen Massenanteil von 0,15% bis 1,0% Kunststoff- oder Glasfasern. In einem konkreten Ausführungsbeispiel wurden ca. 100 g Glasfasern mit einer mittleren Länge von 10 mm und einer Dicke von 1 mm als Gesamteinwaage für den Kernabschnitt und den Schleifabschnitt verwendet. Die Glasfasern sind homogen vermengt worden. Der Kernabschnitt hatte ein Gesamtgewicht von 12 kg, wohingegen der Schleifabschnitt eine Pulver-Einwaage von 49,5 kg besitzt. Zudem sind noch 2 zusätzliche Eisenringe eingebettet worden, deren Gewicht 1,0 kg beträgt, so dass sich ein Gesamtgewicht von 62,5 kg für die Schleifscheibe ergibt. In dem konkret gewählten Ausführungsbeispiel bestand somit der Glasfaseranteil an dem Gewicht des Schleifabschnittes und des Kernabschnitts von jeweils etwa 0,17 %.According to the invention, the abrasive section has, in addition to the matrix material, in which the abrasive grains, for example of aluminum oxide, embedded, a mass fraction of 0.15% to 1.0% plastic or glass fibers. In a specific embodiment, about 100 g of glass fibers having an average length of 10 mm and a thickness of 1 mm were used as a total weight for the core section and the grinding section. The glass fibers have been homogeneously mixed. The core section had a total weight of 12 kg, whereas the abrasive section had a powder weight of 49.5 kg. In addition, two additional iron rings have been embedded, the weight of which is 1.0 kg, resulting in a total weight of 62.5 kg for the grinding wheel. Thus, in the concretely selected embodiment, the glass fiber content was approximately 0.17% of the weight of the abrasive section and the core section.

In einem Testlauf ist die Schleifscheibe mit Drehgeschwindigkeiten von 140 m/sec geprüft worden, ohne dass Ausbrüche größerer Teile des Schleifabschnittes oder Haarrisse, die zu späteren Ausbrüchen führen können, festgestellt wurden. Durch die gezielte Beigabe der Glasfasern kann somit im Unterschied zu solchen Schleifscheiben, deren Schleifabschnitte keine Glasfasern enthielten, eine erhebliche Verbesserung der Festigkeit der Schleifscheibe erreicht werden.In a test run, the grinding wheel was tested at speeds of 140 m / sec, without any breakouts of larger parts of the grinding section or hairline cracks, which could lead to later breakouts, being detected. The targeted addition of the glass fibers can thus be achieved, in contrast to those grinding wheels whose grinding sections did not contain glass fibers, a significant improvement in the strength of the grinding wheel.

Claims (9)

Schleifscheibe, insbesondere zum Längs- oder Querschleifen, mit einem inneren Kernabschnitt (10) und einem äußeren ringförmigen Schleifabschnitt (11), die miteinander verbunden sind, wobei der Schleifabschnitt (11) aus einem körniges Schleifmittel enthaltenden Material besteht,
dadurch gekennzeichnet, dass
zumindest der Schleifabschnitt, vorzugsweise der Schleifabschnitt (11) und der Kernabschnitt (10) zusätzlich 0,15% bis 1 %, vorzugsweise 0,2% bis 0,4%, Kunststoff- oder Glasfasern aufweist, bezogen auf die Masse des Schleifabschnittes.Grinding wheel, in particular for longitudinal or transverse grinding, having an inner core portion (10) and an outer annular grinding portion (11) joined together, the grinding portion (11) being made of a granular abrasive material,
characterized in that
at least the abrasive portion, preferably the abrasive portion (11) and the core portion (10) additionally comprises 0.15% to 1%, preferably 0.2% to 0.4%, of plastic or glass fibers, based on the mass of the abrasive portion. Schleifscheibe nach Anspruch 1, dadurch gekennzeichnet, dass die Glasfasern eine Länge von 5 mm bis 15 mm und eine Dicke von 0,8 mm bis 1,2 mm aufweisen.Grinding wheel according to claim 1, characterized in that the glass fibers have a length of 5 mm to 15 mm and a thickness of 0.8 mm to 1.2 mm. Schleifscheibe nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der im wesentlichen zylinderförmige Außenmantel des Kernabschnittes (10) einzelne Nuten oder singuläre Vertiefungen und der im wesentlichen zylinderförmige Innenmantel des Schleifabschnittes (11) einzelne Rippen oder singuläre Erhebungen aufweist, die jeweils ineinander greifen und eine Relativbewegung des Kernabschnittes (10) und des Schleifabschnittes (11) in Drehrichtung und vorzugsweise in axialer Richtung blockieren.Grinding wheel according to claim 1 or 2, characterized in that the substantially cylindrical outer casing of the core portion (10) has individual grooves or singular recesses and the substantially cylindrical inner surface of the grinding portion (11) individual ribs or singular elevations, each interlocking and one Block relative movement of the core portion (10) and the grinding portion (11) in the direction of rotation and preferably in the axial direction. Schleifscheibe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die körnigen Schleifmittel aus Al2O3, SiC, CBN, ZrO2, Diamant oder Mischungen hieraus bestehen, vorzugsweise mit einer Korngröße von maximal 1 mm Durchmesser.Grinding wheel according to one of claims 1 to 3, characterized in that the granular abrasives of Al 2 O 3 , SiC, CBN, ZrO 2 , diamond or mixtures thereof, preferably with a grain size of not more than 1 mm in diameter. Schleifscheibe nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass der Kernabschnitt und der Schleifabschnitt jeweils thermische Ausdehnungskoeffizienten haben, die vorzugsweise identisch sind oder maximal um 5% voneinander abweichen.Grinding wheel according to one of claims 1 to 4, characterized in that the core portion and the abrasive portion each have thermal expansion coefficients, which are preferably identical or differ by a maximum of 5% from each other. Schleifscheibe nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Schleifabschnitt eine Metall- oder Metalllegierungsmatrix oder eine wärmeaushärtbares Harz enthält, worin die körnigen Schleifmittel und die Kunststoff oder Glasfasern in zumindest weitgehend homogener Verteilung eingebettet sind.Grinding wheel according to one of claims 1 to 5, characterized in that the grinding section contains a metal or metal alloy matrix or a thermosetting resin, wherein the granular abrasives and the plastic or glass fibers are embedded in at least substantially homogeneous distribution. Schleifscheibe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Kernabschnitt im Wesentlichen aus Metall oder Metallen besteht, denen gegebenenfalls Füllstoffe zugesetzt sind.Grinding wheel according to one of claims 1 to 6, characterized in that the core portion consists essentially of metal or metals, which optionally fillers are added. Schleifscheibe nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Kernabschnitt und/oder der Schleifabschnitt ein wärmeaushärtbares Harz sowie ein Vernetzungsmittel und Füllstoffe wie SiC, Al2O3, Bauxit, Graphit oder Molybdänsulfid enthält.Grinding wheel according to one of claims 1 to 6, characterized in that the core portion and / or the abrasive portion contains a thermosetting resin and a crosslinking agent and fillers such as SiC, Al 2 O 3 , bauxite, graphite or molybdenum sulfide. Schleifscheibe nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass zunächst der Kernabschnitt und hierauf der Schleifabschnitt durch Kaltpressen und der zusammenhängende Pressgrünling abschließend auf 180°C bis 200°C erwärmt und auf das gewünschte Maß gepresst worden ist.Grinding wheel according to one of claims 1 to 8, characterized in that first the core section and then the grinding section has been heated by cold pressing and the continuous press green compact finally at 180 ° C to 200 ° C and pressed to the desired degree.
EP13151133.9A 2012-02-06 2013-01-14 Grinding wheel, in particular for longitudinal or transverse grinding Active EP2623264B1 (en)

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DE102012002105A DE102012002105A1 (en) 2012-02-06 2012-02-06 Grinding wheel, in particular for longitudinal or transverse grinding

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EP2623264A3 (en) 2017-08-23
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CN103240684A (en) 2013-08-14
US20130203326A1 (en) 2013-08-08

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