EP0445568B1 - Process for manufacturing of a grinding wheel for grinding spectacle lens edges - Google Patents

Process for manufacturing of a grinding wheel for grinding spectacle lens edges Download PDF

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Publication number
EP0445568B1
EP0445568B1 EP91102312A EP91102312A EP0445568B1 EP 0445568 B1 EP0445568 B1 EP 0445568B1 EP 91102312 A EP91102312 A EP 91102312A EP 91102312 A EP91102312 A EP 91102312A EP 0445568 B1 EP0445568 B1 EP 0445568B1
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EP
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Prior art keywords
ring
process according
grinding
abrasive coating
grinding wheel
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EP91102312A
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German (de)
French (fr)
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EP0445568A1 (en
Inventor
Hans-Robert Dr.-Ing. Meyer
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Saint Gobain Diamantwerkzeuge GmbH and Co KG
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Ernst Winter and Sohn Diamantwekzeuge GmbH and Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0018—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by electrolytic deposition
    • 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

Definitions

  • the invention relates to a method for producing a grinding wheel for grinding spectacle lens edges.
  • a grinding wheel for grinding spectacle lens edges has become known, in which sinterable grinding material is calendered with a temporary binder onto a grid or sheet metal strip.
  • the blank thus obtained is formed into a closed ring.
  • the abrasive material layer is sintered before or after the ring is made by applying heat.
  • the finished ring is then drawn with a layer pointing outwards onto a support part which is adapted or adapted to the inside diameter of the ring and connected to it.
  • the abrasive material consists of shares in diamond chips and bronze or a bronze alloy as well as a temporary binder; the support part is made of plastic.
  • the calendering of the abrasive layer onto the sheet metal blank is intended to bring about homogeneity and the clawing of the abrasive material with the lattice or perforated structure of the sheet metal strip is intended to provide a firm connection with this or the supporting part.
  • the blank used must be flexible so that it can be bent into a ring. The same applies to the abrasive material layer.
  • a grinding wheel which consists of a support body, a metal ring applied to the support body and an abrasive layer.
  • the abrasive layer contains diamond chips that are bonded to the metal ring using tungsten sprayed using the plasma process.
  • the metal ring is used to dissipate heat from the diamond cutting during grinding.
  • the invention has for its object to provide a grinding wheel for grinding spectacle lens edges, which grinds the extremely brittle and thin glass material precisely and gently and which can be manufactured especially with relatively little effort.
  • the grinding wheel according to the invention has a one-piece ring made of copper or bronze, which is applied to the base body made of plastic material. It is applied to the base body in close physical contact between the ring and the base body. It can e.g. by shrinking or gluing the ring onto the base body.
  • the ring made of copper or bronze is in one piece and its strength and heat resistance are such that the abrasive coating consisting only of metal and diamond can be applied in a sintering process under pressure and heat.
  • the metal ring also allows the heat generated during grinding to be dissipated.
  • the metallic ring serves as a support body that can be produced with sufficient precision for sintering on the grinding surface at a higher temperature and sufficient pressure.
  • the ring must therefore be designed so that it withstands the stresses in the sintering process.
  • Copper or bronze are selected as the material for the ring in order to achieve sufficient adhesion of the abrasive coating to the metal ring during sintering. This is particularly well guaranteed for copper.
  • the ring of the grinding wheel according to the invention has a thickness of up to 10% of the radius of the grinding wheel and, according to a further embodiment of the invention, can have a thickness which is of the order of 3 to 10 mm.
  • the basic body made of plastic serves to dampen vibrations and reduces the weight of the grinding wheel.
  • it consists of phenolic resin.
  • it can be permeated with fillers, predominantly with fibrous materials. Carbon or glass fibers, possibly also asbestos fibers, are suitable as fillers.
  • Grinding disks for spectacle lens edges often have a profile.
  • an outer peripheral surface of the grinding wheel and the interface between the abrasive coating and the one-piece solid ring each have a profile, the profiles being identical or similar.
  • the claimed design of a basic body essentially made of plastic, in connection with the interposed ring made of metallic material for the diamond and metal abrasive coating surprisingly results in a vibration behavior with regard to damping or rigidity, which ensures a gentle material intervention.
  • the deposit of the specified abrasive coating with a ring made of metallic material ensures the symmetry and accuracy and, with the properties of the metallic material, also ensures particularly favorable heat dissipation in the disk. This is for a plastic core, be it with fillers, essential. What is important, however, is the interposition of the ring made of metallic material with the specified properties to improve the fitability, that is to say the circumferential strength and the engagement stability of the materials of the disk, which only ensures that a precision instrument is created.
  • the metallic material of the ring is more heat resistant than the abrasive coating.
  • the preferred embodiment is that the ring consists of copper.
  • the ring consists of bronze, in particular tempered bronze.
  • the invention is based on a grinding wheel with a diamond and metal abrasive coating. It is preferred that bronzes, electrodeposited nickel, hard metals or other metal alloys are predominantly used as the metal in the abrasive coating. Bronze is particularly advantageous because it can be applied inexpensively and inexpensively to a metallic ring.
  • the invention therefore consists in a grinding wheel with a sintered abrasive coating with diamond particles in the order of magnitude of 3 to 250 ⁇ m and a metal, in particular copper layer, which forms an annularly defined carrier with good thermal conductivity, based on a base body of the grinding wheel.
  • This disc is relatively light, but also sufficiently strong in terms of stress.
  • An advantageous embodiment consists in that the ring-shaped assembly is applied by shrink fitting. This also has the advantage of a tight contact with the circumferential surface of the base body, so that the machining, provided that it takes place under the usual metallic tolerances, is facilitated.
  • the shrinking creates an absolutely firm connection to the disk-shaped base body, with the result that a high-precision tool is then created.
  • the ring-shaped assembly of abrasive coating and ring can be glued to the base body, but the adhesive layer is then so small that elasticities are excluded.
  • the invention creates a new grinding tool with special properties especially in connection with the processing of glass. It can be assumed that the plastic base body can be machined precisely. It is less subject to external influences than metal, i.e. in the event of expansion. These properties would be adversely affected if significant amounts of metal were introduced.
  • a damping carrier with low mass is essential for grinding glass.
  • the plastic is light and damping is. Even if there is an imbalance, it can be cushioned and there is no destruction of the processing material in the form of breakouts.
  • Copper as a heat-conducting deposit has a high thermal conductivity and creates a secure connection.
  • a direct joint is initially provided on the damping plastic base body with the metallic base.
  • the circumference of the plastic base body is carried out in the vicinity of the abrasive coating, including the metallic ring, with increased thermal conductivity.
  • thermally conductive substances in particular metals, can be introduced into the plastic base body, which extend in the body to an area up to a maximum of 20% of the radius from the outside.
  • the grinding wheel is a profiled or cylindrical peripheral wheel, as can be used for grinding the edges of spectacle lenses.
  • it consists of an abrasive coating 1.
  • This has a thickness of approximately 3 mm.
  • It consists of diamond particles as grinding wheels, which are held in a binder, advantageously bronze.
  • This is a sintered abrasive coating on a copper ring 2, which is designed as a metallic, ring-shaped carrier, has good thermal conductivity, but still has sufficient stability to support the abrasive coating in a defined manner.
  • This copper ring 2 is arranged on a base body 3, which consists of synthetic resin, in particular of a phenolic resin according to the above statements. Fillers (not shown in the drawing) are advantageously arranged in this phenolic resin, which can consist of glass or carbon fibers.
  • metal particles for example made of aluminum, particularly in the vicinity of the joint between the ring 2 and the base body 3, in order thereby to improve the heat transfer.
  • the ring 2 can be applied to the base body 3 by gluing or shrinking.
  • the base body has a central hole 4, by means of which it can be applied to a spindle of a grinding machine.
  • the profiling which can be seen in FIG. 2, is suitable for grinding an eyeglass rim with a conventional, protruding web.
  • cylindrical, non-profiled grinding wheels are used.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

Grinding disc has a profiled or cylindrical shape with an approx. 3mm thick outer abrasive layer(1) of diamond particles in a metallic, pref. bronze, binder. The abrasive layer (1) is carried on a metallic ring, e.g. copper, with good heat conductivity. Ring thickness is up to 10% of the disc radius. A body (3) mfd. in a glass or carbon reinforced phenolic resin, supports the copper ring (2). Heat transfer between the body and the ring (2) can be improved by addn. of metal particles e.g. aluminium in the joint region. The ring (2) is attached to the body (3) by bonding or shrinking-on. A central hole (4) in the body (3) accepts a spindle.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Herstellung einer Schleifscheibe zum Schleifen von Brillenglasrändern.The invention relates to a method for producing a grinding wheel for grinding spectacle lens edges.

Aus der DE-A-35 37 331 ist eine Schleifscheibe zum Schleifen von Brillenglasrändern bekannt geworden, bei der sinterfähiges Schleifmaterial mit temporärem Bindemittel auf einen Gitter- oder Blechstreifen kalandriert wird. Der so gewonnene Zuschnitt wird zu einem geschlossenen Ring geformt. Die Schleifmaterialschicht wird vor der Herstellung des Ringes oder im Anschluß hieran durch Zufuhr von Wärme gesintert. Der fertige Ring wird anschließend mit nach außen zeigender Schicht auf einen dem Innendurchmesser des Rings angepaßten oder anzupassenden Tragteil aufgezogen und mit diesem verbunden. Das Schleifmaterial besteht aus Anteilen an Diamantsplittern und Bronze oder einer Bronzelegierung sowie einem temporärem Bindemittel; der Tragteil besteht aus Kunststoff.From DE-A-35 37 331 a grinding wheel for grinding spectacle lens edges has become known, in which sinterable grinding material is calendered with a temporary binder onto a grid or sheet metal strip. The blank thus obtained is formed into a closed ring. The abrasive material layer is sintered before or after the ring is made by applying heat. The finished ring is then drawn with a layer pointing outwards onto a support part which is adapted or adapted to the inside diameter of the ring and connected to it. The abrasive material consists of shares in diamond chips and bronze or a bronze alloy as well as a temporary binder; the support part is made of plastic.

Bei der bekannten Schleifscheibe sind eine hohe Homogenität sowie eine hohe Festigkeit der Schleifmaterialschicht angestrebt. Das Aufkalandrieren der Schleifmittelschicht auf den Blechzuschnitt soll die Homogenität bewerkstelligen und das Verkrallen des Schleifmaterials mit der Gitter- oder Lochstruktur des Blechstreifens eine feste Verbindung mit diesem bzw. dem Tragteil. Hierzu muß der verwendete Zuschnitt flexibel sein, damit er zu einem Ring gebogen werden kann. Gleiches trifft auf die Schleifmaterialschicht zu.In the known grinding wheel, high homogeneity and high strength of the grinding material layer are aimed for. The calendering of the abrasive layer onto the sheet metal blank is intended to bring about homogeneity and the clawing of the abrasive material with the lattice or perforated structure of the sheet metal strip is intended to provide a firm connection with this or the supporting part. To do this, the blank used must be flexible so that it can be bent into a ring. The same applies to the abrasive material layer.

Aus dem Dokument "Soviet Inventions Illustrated, Derwent Publications", Section mech., Week 9036, abstract number 90-273056/36 ist eine Schleifscheibe bekannt geworden, die aus einem Tragkörper, einem auf dem Tragkörper aufgebrachten Metallring und einer Schleifmittelschicht besteht. Die Schleifmittelschicht enthält Diamantsplitter, die mit Hilfe von im Plasmaverfahren aufgesprühtem Wolfram mit dem Metallring verbunden sind. Der Metallring dient der Wärmeabfuhr von dem Diamantschneiden beim Schleifen.From the document "Soviet Inventions Illustrated, Derwent Publications", Section mech., Week 9036, abstract number 90-273056 / 36, a grinding wheel has become known which consists of a support body, a metal ring applied to the support body and an abrasive layer. The abrasive layer contains diamond chips that are bonded to the metal ring using tungsten sprayed using the plasma process. The metal ring is used to dissipate heat from the diamond cutting during grinding.

Der Erfindung liegt die Aufgabe zugrunde, eine Schleifscheibe zum Schleifen von Brillenglasrändern zu schaffen, die das extrem spröde und dünne Glasmaterial präzise und schonend schleift und die vor allem mit relativ geringem Aufwand hergestellt werden kann.The invention has for its object to provide a grinding wheel for grinding spectacle lens edges, which grinds the extremely brittle and thin glass material precisely and gently and which can be manufactured especially with relatively little effort.

Diese Aufgabe wird durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den Patentansprüchen angegeben.This object is achieved by a method having the features of patent claim 1. Advantageous developments of the invention are specified in the patent claims.

Die erfindungsgemäße Schleifscheibe weist einen einteiligen Ring aus Kupfer oder Bronze auf, der auf den Grundkörper aus Kunststoffmaterial aufgebracht ist. Die Aufbringung auf den Grundkörper erfolgt in enger körperlicher Anlage zwischen Ring und Grundkörper. Sie kann z.B. durch Aufschrumpfen oder Kleben des Rings auf den Grundkörper vorgenommen werden.The grinding wheel according to the invention has a one-piece ring made of copper or bronze, which is applied to the base body made of plastic material. It is applied to the base body in close physical contact between the ring and the base body. It can e.g. by shrinking or gluing the ring onto the base body.

Der Ring aus Kupfer oder Bronze ist einteilig und in seiner Festigkeit und Warmfestigkeit so beschaffen, daß der nur aus Metall und Diamant bestehende Schleifbelag im Sinterverfahren unter Druck und Wärme aufgebracht werden kann. Der Metallring ermöglicht auch die Ableitung von beim Schleifen entstehender Wärme.The ring made of copper or bronze is in one piece and its strength and heat resistance are such that the abrasive coating consisting only of metal and diamond can be applied in a sintering process under pressure and heat. The metal ring also allows the heat generated during grinding to be dissipated.

Bei der erfindungsgemäßen Schleifscheibe dient der metallische Ring als ausreichend genau herstellbarer Tragkörper zum Aufsintern des Schleifbelags unter höherer Temperatur und ausreichendem Druck. Der Ring ist daher so auszulegen, daß er den Belastungen im Sinterprozeß standhält.In the grinding wheel according to the invention, the metallic ring serves as a support body that can be produced with sufficient precision for sintering on the grinding surface at a higher temperature and sufficient pressure. The ring must therefore be designed so that it withstands the stresses in the sintering process.

Kupfer oder Bronze als Werkstoff für den Ring sind gewählt, um beim Sintern eine ausreichende Haftung des Schleifbelags am Metallring zu erzielen. Diese ist insbesondere bei Kupfer hervorragend gewährleistet.Copper or bronze are selected as the material for the ring in order to achieve sufficient adhesion of the abrasive coating to the metal ring during sintering. This is particularly well guaranteed for copper.

Der Ring der erfindungsgemäßen Schleifscheibe weist nach einer Ausgestaltung der Erfindung eine Dicke bis zu 10 % des Radius der Schleifscheibe auf und kann nach einer weiteren Ausgestaltung der Erfindung eine Dicke haben, die in der Größenordnung von 3 bis 10 mm liegt. Der Grundkörper aus Kunststoff dient zur Schwingungsdämpfung und reduziert das Gewicht der Schleifscheibe. Nach einer Ausgestaltung der Erfindung besteht er aus Phenol-Harz. Er kann nach einer weiteren Ausgestaltung der Erfindung mit Füllstoffen durchsetzt sein, vorwiegend mit Faserstoffen. Als Füllstoffe kommen Kohlenstoff- oder Glasfasern, ggf. auch Asbestfasern in Betracht.According to one embodiment of the invention, the ring of the grinding wheel according to the invention has a thickness of up to 10% of the radius of the grinding wheel and, according to a further embodiment of the invention, can have a thickness which is of the order of 3 to 10 mm. The basic body made of plastic serves to dampen vibrations and reduces the weight of the grinding wheel. According to one embodiment of the invention, it consists of phenolic resin. According to a further embodiment of the invention, it can be permeated with fillers, predominantly with fibrous materials. Carbon or glass fibers, possibly also asbestos fibers, are suitable as fillers.

Schleifscheiben für Brillenglasränder weisen häufig ein Profil auf. In diesem Zusammenhang weist nach einer Ausgestaltung der Erfindung eine äußere Umfangsfläche der Schleifscheibe und die Grenzfläche zwischen Schleifmittelbelag und einteiligem massivem Ring je ein Profil auf, wobei die Profile gleich oder ähnlich sind.Grinding disks for spectacle lens edges often have a profile. In this context, according to one embodiment of the invention, an outer peripheral surface of the grinding wheel and the interface between the abrasive coating and the one-piece solid ring each have a profile, the profiles being identical or similar.

Die beanspruchte Ausführung eines Grundkörpers im wesentlichen aus Kunststoff bringt gerade in Verbindung mit dem zwischengeschalteten Ring aus metallischem Material zum Schleifbelag aus Diamant und Metall überraschend ein Schwingungsverhalten hinsichtlich der Dämpfung oder auch Steifigkeit mit sich, das einen schonenden Materialeingriff gewährleistet. Die Hinterlegung des angegebenen Schleifbelages mit einem Ring aus metallischem Material sichert dabei die Symmetrie und Genauigkeit und gewährleistet mit den Eigenschaften des metallischen Materials auch eine besonders günstige Wärmeabführung in der Scheibe. Das ist für einen Kunststoffkern, sei er auch mit Füllstoffen versehen, wesentlich. Wichtig ist aber durch die Zwischenschaltung des Ringes aus metallischem Material der angegebenen Eigenschaften die Verbesserung der Fügbarkeit, d.h. der Umfangsfestigkeit und Eingriffsstandfestigkeit der Materialien der Scheibe, die erst gewährleistet, daß ein Präzisionsinstrument geschaffen wird.The claimed design of a basic body essentially made of plastic, in connection with the interposed ring made of metallic material for the diamond and metal abrasive coating, surprisingly results in a vibration behavior with regard to damping or rigidity, which ensures a gentle material intervention. The deposit of the specified abrasive coating with a ring made of metallic material ensures the symmetry and accuracy and, with the properties of the metallic material, also ensures particularly favorable heat dissipation in the disk. This is for a plastic core, be it with fillers, essential. What is important, however, is the interposition of the ring made of metallic material with the specified properties to improve the fitability, that is to say the circumferential strength and the engagement stability of the materials of the disk, which only ensures that a precision instrument is created.

Bei der Verwendung eines Kunststoff-Grundkörpers und metallischen Zwischenringes in Verbindung mit einem Schleifbelag aus Diamant und Metall, Bronze, galvanischem Nickel oder Hartmetall ergibt sich schon hinsichtlich der Fügbarkeit, des Schwingungsverhaltens und der symmetrischen Genauigkeit bei guter Wärmeabführung eine besonders günstige Lösung.When using a plastic base body and a metal intermediate ring in connection with an abrasive coating made of diamond and metal, bronze, galvanic nickel or hard metal, there is a particularly favorable solution with regard to the availability, the vibration behavior and the symmetrical accuracy with good heat dissipation.

Ferner wird bevorzugt, daß das metallische Material des Ringes wärmefester als der Schleifbelag ist.It is also preferred that the metallic material of the ring is more heat resistant than the abrasive coating.

Sowohl hinsichtlich der Wärmeabführung, der Fügbarkeit und des Dämpfungsverhaltens liegt die bevorzugte Ausführungsform darin, daß der Ring aus Kupfer besteht. Nicht ausgeschlossen wird in einer auch noch zweckmäßigen Ausgestaltung, daß der Ring aus Bronze, insbesondere vergüteter Bronze besteht.With regard to heat dissipation, the ability to be joined and the damping behavior, the preferred embodiment is that the ring consists of copper. In an even expedient embodiment, it is not excluded that the ring consists of bronze, in particular tempered bronze.

Wie oben dargelegt, geht die Erfindung von einer Schleifscheibe mit einem Schleifbelag aus Diamant und Metall aus. Dabei wird bevorzugt, daß als Metall im Schleifbelag vorwiegend Bronzen, galvanisch niedergeschlagenes Nickel, Hartmetalle oder andere Metall-Legierungen verwendet werden. Bronze ist besonders vorteilhaft, weil sie preiswert und günstig auf einen metallischen Ring aufgebracht werden kann.As stated above, the invention is based on a grinding wheel with a diamond and metal abrasive coating. It is preferred that bronzes, electrodeposited nickel, hard metals or other metal alloys are predominantly used as the metal in the abrasive coating. Bronze is particularly advantageous because it can be applied inexpensively and inexpensively to a metallic ring.

Günstige Fügungen ergeben sich zwischen Bronze als Binder des Schleifbelags und Kupfer des Ringes. Dabei zeichnet sich Kupfer durch eine sehr gute Wärmeleitfähigkeit aus.Favorable joining results between bronze as a binder of the abrasive coating and copper of the ring. Copper is characterized by very good thermal conductivity.

Die Erfindung besteht daher in einer Schleifscheibe mit einem gesinterten Schleifbelag mit Diamant-Partikeln in einer Größenordnung von 3 bis 250 µm und einer Metall-, insbesondere Kupferschicht, welche einen ringförmig definierten Träger mit guter Wärmeleitfähigkeit, bezogen auf einen Grundkörper der Schleifscheibe, bildet. Diese Scheibe ist verhältnismäßig leicht, aber auch genügend fest hinsichtlich der Beanspruchung.The invention therefore consists in a grinding wheel with a sintered abrasive coating with diamond particles in the order of magnitude of 3 to 250 μm and a metal, in particular copper layer, which forms an annularly defined carrier with good thermal conductivity, based on a base body of the grinding wheel. This disc is relatively light, but also sufficiently strong in terms of stress.

Es ergeben sich, insbesondere für die Baugruppe aus dem metallischen Ring und dem Schleifbelag, die durch Sinterung zusammengesetzt sind, verschiedene Aufbringungsmöglichkeiten auf den Grundkörper. Dabei besteht eine vorteilhafte Ausführung darin, daß die ringförmig vorberei tete Baugruppe durch Aufschrumpfung aufgebracht ist. Dieses hat auch den Vorteil einer dichten Anlage an die Umfangsfläche des Grundkörpers, so daß dadurch die Bearbeitung, sofern sie unter metallisch üblichen Toleranzen erfolgt, erleichtert wird. Die Aufschrumpfung schafft eine absolut feste Verbindung zu dem scheibenförmigen Grundkörper mit dem Ergebnis, daß dann ein hochpräzise arbeitendes Werkzeug geschaffen wird.There are various application options, in particular for the assembly consisting of the metallic ring and the abrasive coating, which are composed by sintering on the main body. An advantageous embodiment consists in that the ring-shaped assembly is applied by shrink fitting. This also has the advantage of a tight contact with the circumferential surface of the base body, so that the machining, provided that it takes place under the usual metallic tolerances, is facilitated. The shrinking creates an absolutely firm connection to the disk-shaped base body, with the result that a high-precision tool is then created.

Die ringförmige Baugruppe aus Schleifbelag und Ring kann auf den Grundkörper aufgeklebt werden, wobei aber die Klebeschicht dann so gering ist, daß Elastizitäten ausgeschlossen werden.The ring-shaped assembly of abrasive coating and ring can be glued to the base body, but the adhesive layer is then so small that elasticities are excluded.

Die Erfindung schafft gerade im Zusammenhang mit der Bearbeitung von Glas ein neues Schleifwerkzeug mit besonderen Eigenschaften. Dabei kann davon ausgegangen werden, daß der Kunststoff-Grundkörper präzise zu bearbeiten ist. Er unter liegt weniger als Metall äußeren Einflüssen, d.h. bei Wärmeeinwirkung einer Ausdehnung. Diese Eigenschaften würden beeinträchtigt, wenn Metall in erheblichem Umfang eingebracht würde.The invention creates a new grinding tool with special properties especially in connection with the processing of glass. It can be assumed that the plastic base body can be machined precisely. It is less subject to external influences than metal, i.e. in the event of expansion. These properties would be adversely affected if significant amounts of metal were introduced.

Für das Schleifen von Glas ist ein dämpfender Träger mit geringer Masse wesentlich.A damping carrier with low mass is essential for grinding glass.

Für die erfindungsgemäße Ausführung ist vorteilhaft davon auszugehen, daß der Kunststoff leicht und dämpfend ausgeführt ist. Selbst wenn eine Unwucht vorhanden wäre, kann sie abgefedert werden, und es kommt nicht zur Vernichtung des bearbeitenden Materials in Form von Ausbrüchen.For the embodiment according to the invention it is advantageous to assume that the plastic is light and damping is. Even if there is an imbalance, it can be cushioned and there is no destruction of the processing material in the form of breakouts.

Gute Wärmeabführung wird durch eine metallische Hinterlegung der Schleifschicht erreicht. Hierdurch kann die Schleifschicht bis zum Verbrauch auch der letzten, relativ teuren Diamant-Partikel abgearbeitet werden.Good heat dissipation is achieved by a metallic deposit on the grinding layer. As a result, the grinding layer can be processed until the last, relatively expensive diamond particles are used up.

Kupfer als wärmeleitende Hinterlegung weist dabei eine hohe Wärmeleitfähigkeit auf und stellt eine sichere Verbindung her. Hierbei ist zunächst mit der metallischen Unterlage eine unmittelbare Fügung auf dem dämpfenden Kunststoff-Grundkörper vorgesehen.Copper as a heat-conducting deposit has a high thermal conductivity and creates a secure connection. In this case, a direct joint is initially provided on the damping plastic base body with the metallic base.

Einbezogen wird dabei eben mit Vorteil die Zwischenschaltung eines metallischen Belages. Ohne diesen wären zum Wärmeübergang besondere Eigenschaften des Kunststoff-Grundkörpers erforderlich, die nicht oder nur sehr schwer zu verwirklichen wären.The interposition of a metallic covering is advantageously included. Without this, special properties of the plastic base body would be required for heat transfer, which would be difficult or impossible to achieve.

Bevorzugt wird , daß der Kunststoff-Grundkörper an seinem Umfang in der Nachbarschaft des Schleifbelages einschließlich des metallischen Ringes mit erhöhter Wärmeleitfähigkeit ausgeführt ist.It is preferred that the circumference of the plastic base body is carried out in the vicinity of the abrasive coating, including the metallic ring, with increased thermal conductivity.

Zur Verbesserung der Wärmeabführung sind können in den Kunststoff-Grundkörper am Umfang wärmeleitfähige Substanzen, insbesondere Metalle eingebracht werden, die sich im Körper auf einen Bereich bis höchstens 20 % des Radius von außen erstrecken.To improve the heat dissipation, thermally conductive substances, in particular metals, can be introduced into the plastic base body, which extend in the body to an area up to a maximum of 20% of the radius from the outside.

Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels erläutert, das in der Zeichnung dargestellt ist. In der Zeichnung zeigen:

Fig. 1
eine Seitenansicht einer Schleifscheibe mit vergrößerten Proportionen, soweit es sich um eine Scheibe zur Anwendung für das Randschleifen von Brillen handelt;
Fig. 2
einen Schnitt in Teildarstellung längs der Linie II-II durch Fig. 1.
The invention is explained below using an exemplary embodiment which is shown in the drawing. The drawing shows:
Fig. 1
a side view of a grinding wheel with enlarged proportions, as far as it is a wheel for use for edge grinding of glasses;
Fig. 2
a section in partial representation along the line II-II through Fig. 1st

Die Schleifscheibe ist eine profilierte oder zylindrische Umfangsscheibe, wie sie zum Schleifen von Brillenglasrändern eingesetzt werden kann. Sie besteht in der vorteilhaften, dargestellten Ausführung aus einem Schleifbelag 1. Dieser hat eine Stärke von etwa 3 mm. Er besteht aus Diamant-Partikeln als Schleifkörper, die in einem Binder, vorteilhaft Bronze, gehalten sind. Hierbei handelt es sich um einen gesinterten Schleifbelag auf einem Kupferring 2, der als metallischer, ringförmiger Träger ausgeführt ist, gute Wärmeleitfähigkeit hat, aber noch ausreichende Stabilität zur definierten Abstützung des Schleifbelags.The grinding wheel is a profiled or cylindrical peripheral wheel, as can be used for grinding the edges of spectacle lenses. In the advantageous embodiment shown, it consists of an abrasive coating 1. This has a thickness of approximately 3 mm. It consists of diamond particles as grinding wheels, which are held in a binder, advantageously bronze. This is a sintered abrasive coating on a copper ring 2, which is designed as a metallic, ring-shaped carrier, has good thermal conductivity, but still has sufficient stability to support the abrasive coating in a defined manner.

Dieser Kupferring 2 ist auf einem Grundkörper 3 angeordnet, der aus Kunstharz, insbesondere aus einem Phenol-Harz gemäß obigen Darlegungen besteht. In diesem Phenol-Harz sind vorteilhaft in der Zeichnung nicht dargestellte Füllstoffe angeordnet, die aus Glas- oder Kohlenstoff-Fasern bestehen können.This copper ring 2 is arranged on a base body 3, which consists of synthetic resin, in particular of a phenolic resin according to the above statements. Fillers (not shown in the drawing) are advantageously arranged in this phenolic resin, which can consist of glass or carbon fibers.

Es besteht ferner die Möglichkeit, Metallpartikel, beispielsweise aus Aluminium, besonders in der Nähe der Fügung zwischen dem Ring 2 und dem Grundkörper 3 anzuordnen, um dadurch den Wärmeübergang zu verbessern.There is also the possibility of arranging metal particles, for example made of aluminum, particularly in the vicinity of the joint between the ring 2 and the base body 3, in order thereby to improve the heat transfer.

Der Ring 2 kann auf den Grundkörper 3 durch Klebung oder Aufschrumpfung aufgebracht werden.The ring 2 can be applied to the base body 3 by gluing or shrinking.

Der Grundkörper hat ein mittleres Loch 4, mittels dessen er auf eine Spindel einer Schleifmaschine aufgebracht werden kann.The base body has a central hole 4, by means of which it can be applied to a spindle of a grinding machine.

Die Profilierung, die aus Fig. 2 erkennbar ist, ist geeignet, um einen Brillenglasrand mit einem üblichen, hervorspringenden Steg zu schleifen, zum Vorschleifen werden zylindriche, nichtprofilierte Schleifscheiben verwendet.The profiling, which can be seen in FIG. 2, is suitable for grinding an eyeglass rim with a conventional, protruding web. For grinding, cylindrical, non-profiled grinding wheels are used.

Claims (9)

  1. A process for manufacturing of a grinding wheel for grinding spectacle lens edges, wherein on a one-piece solid ring (2) of copper or bronze being strong enough for sintering the abrasive coating (1) on said ring (2) said abrasive coating (1) of diamond and metal is sintered to the peripheral face of said ring (2) under the application of pressure and heat and the module made up of said ring (2) and said abrasive coating (1) is bonded to the peripheral face of an annular base member (3) consisting of plastic material.
  2. The process according to claim 1, wherein the thickness of said abrasive coating (1) is 3 mm or less.
  3. The process according to claim 1 or 2, wherein said ring (2) has a thickness of up to 10% of the radius of said grinding wheel.
  4. The process according to any of the previous claims, wherein the thickness of said ring is selected in the range of between 3 to 10 mm.
  5. The process according to claims 1 to 4, wherein said base member (3) is made of phenol resin (phenol-formaldehyde condensation products).
  6. The process according to claims 1 to 5, wherein said base member (3) is interspersed with filling materials, primarily fiber material.
  7. The process according to claim 6, wherein carbon fibres or glass fibres, if necessary also asbestos fibres, are provided as filling material.
  8. The process according to any of the claims 1 to 7, where-in mainly bronzes, galvanically deposited nickel, hard metals or other metal alloys are used as metallic material in said abrasive coating (1).
  9. The process according to any of the claims 1 to 8,wherein the outer peripheral face of said grinding wheel and the boundary surface between said abrasive coating and said one-piece solid ring (2) have an identical or similar profile each.
EP91102312A 1990-03-03 1991-02-19 Process for manufacturing of a grinding wheel for grinding spectacle lens edges Expired - Lifetime EP0445568B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4006660A DE4006660A1 (en) 1990-03-03 1990-03-03 Grinding disc for profiling spectacle lens edges - has plastic body with outer abrasive edge of diamond particles in metal, e.g. bronze, and a supporting copper ring
DE4006660 1990-03-03

Publications (2)

Publication Number Publication Date
EP0445568A1 EP0445568A1 (en) 1991-09-11
EP0445568B1 true EP0445568B1 (en) 1994-08-10

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ID=6401327

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EP91102312A Expired - Lifetime EP0445568B1 (en) 1990-03-03 1991-02-19 Process for manufacturing of a grinding wheel for grinding spectacle lens edges

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US (1) US5645476A (en)
EP (1) EP0445568B1 (en)
JP (1) JP3196030B2 (en)
AT (1) ATE109710T1 (en)
DE (2) DE4006660A1 (en)
DK (1) DK0445568T3 (en)
ES (1) ES2058952T3 (en)

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US5735732A (en) * 1996-07-05 1998-04-07 Bernard; David A. Precision drill sharpener and grinding wheel assembly therefor
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EP1053079B1 (en) * 1998-02-04 2002-10-30 Unicorn Abrasives Limited Grinding wheel
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JP2003039331A (en) 2001-08-01 2003-02-13 Noritake Co Ltd Grinding wheel having resin core part, manufacturing method thereof, and recycling method thereof
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Also Published As

Publication number Publication date
DE4006660A1 (en) 1991-09-05
ES2058952T3 (en) 1994-11-01
DK0445568T3 (en) 1994-11-21
DE59102461D1 (en) 1994-09-15
JPH04217462A (en) 1992-08-07
EP0445568A1 (en) 1991-09-11
DE4006660C2 (en) 1992-10-08
ATE109710T1 (en) 1994-08-15
US5645476A (en) 1997-07-08
JP3196030B2 (en) 2001-08-06

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