DE1298855B - Contact disc for the electrolytic grinding of workpieces - Google Patents

Contact disc for the electrolytic grinding of workpieces

Info

Publication number
DE1298855B
DE1298855B DE1961W0031295 DEW0031295A DE1298855B DE 1298855 B DE1298855 B DE 1298855B DE 1961W0031295 DE1961W0031295 DE 1961W0031295 DE W0031295 A DEW0031295 A DE W0031295A DE 1298855 B DE1298855 B DE 1298855B
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DE
Germany
Prior art keywords
percent
weight
contact
disc
workpieces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE1961W0031295
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German (de)
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE1961W0031295 priority Critical patent/DE1298855B/en
Publication of DE1298855B publication Critical patent/DE1298855B/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B24D3/02—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 bonding agent
    • B24D3/04—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 bonding agent and being essentially inorganic
    • B24D3/06—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 bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • B24D3/08—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 bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for close-grained structure, e.g. using metal with low melting point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H5/00—Combined machining
    • B23H5/06—Electrochemical machining combined with mechanical working, e.g. grinding or honing
    • B23H5/08—Electrolytic grinding

Description

Die Erfindung bezieht sich auf eine Kontaktscheibe für das elektrolytische Schleifen von Werkstücken, die einen Kontaktbelag aus leitenden Werkstoffen und Schleifmittel, wie Diamant, Korund, Spinell, Siliziumkarbid od. dgl., aufweist.The invention relates to a contact disc for the electrolytic Grinding of workpieces that have a contact layer made of conductive materials and Abrasives such as diamond, corundum, spinel, silicon carbide or the like.

Bekannt sind Kontaktscheiben zum elektrolytischen Schleifen, die aus einer Mischung feinverteilter Schleifmittel und metallischer Binder bestehen, wobei als Schleifkorn unter anderem Aluminiumoxyd verwendet wird (USA.-Patentschrift 2 793 992).Contact disks for electrolytic grinding are known which consist of consist of a mixture of finely divided abrasives and metallic binders, wherein among other things aluminum oxide is used as abrasive grain (USA.Patent 2 793 992).

Es ist ferner bei Elektroden zur Funkenerosion bekannt, Aluminiumoxyd als verhältnismäßig funkenerosionsfesten Zusatz zu verwenden (deutsche Auslegeschrift 1061005).It is also known for electrodes for spark erosion, aluminum oxide to be used as a relatively spark-erosion-resistant additive (German Auslegeschrift 1061005).

Der Erfindung liegt die Aufgabe zugrunde, die Funkenbildung an der Schleiffläche bei unverminderter Abtraggeschwindigkeit herabzusetzen, die Temperatur der Scheibe beim Schleifen niedrig zu halten und das Maß der Abnutzung der Scheibe zu vermindern. Zur Lösung dieser Aufgabe sieht die Erfindung einen Kontaktbelag vor, der aus einer bis zu 40 Gewichtsprozent Aluminiumoxyd, Rest Metall, enthaltenden Legierung besteht, in die das Schleifkorn eingebettet ist.The invention is based on the object of sparking at the Reduce the grinding surface with undiminished removal rate, the temperature to keep the wheel low when grinding and the amount of wear on the wheel to diminish. To solve this problem, the invention provides a contact coating before, the one containing up to 40 percent by weight of aluminum oxide, the remainder being metal Alloy consists in which the abrasive grain is embedded.

Als eine bevorzugte Zusammensetzung des Belages sei genannt: Al 203 ....... 10 bis 30 Gewichtsprozent, Ag ......... 15 bis 30 Gewichtsprozent, Cu ......... 38 bis 50 Gewichtsprozent, Sn ......... 6 bis 12 Gewichtsprozent. Im Gegensatz zu den bekannten Kontaktscheiben bildet bei der Scheibe nach der Erfindung das Aluminiumoxyd nicht das Schleifmittel, sondern einen Bestandteil der Legierung, in die das Schleifkorn eingebettet ist. Die bei Funkenerosionselektroden bekannte Widerstandsfähigkeit des Aluminiumoxyds wird nunmehr auch beim Elysieren ausgenutzt, wo Funkenbildung als unerwünschte Nebenwirkung auftritt.A preferred composition of the covering is: Al 203 ....... 10 to 30 percent by weight, Ag ......... 15 to 30 percent by weight, Cu ......... 38 to 50 percent by weight, Sn ......... 6 to 12 percent by weight. In contrast to the known contact disks, in the disk according to the invention the aluminum oxide does not form the abrasive, but rather a component of the alloy in which the abrasive grain is embedded. The resistance of aluminum oxide, which is known from spark erosion electrodes, is now also used in elysation, where spark formation occurs as an undesirable side effect.

Die mit der Scheibe nach der Erfindung erzielte Herabsetzung der Funkenbildung bei unverminderter Abtraggeschwindigkeit beruht nicht allein darauf, daß die elektrische Leitfähigkeit der Scheibe durch das Aluminiumoxyd vermindert wird. Denn wäre dies der Fall, dann müßte die gleiche Wirkung dadurch erzielt werden können, daß man die Generatorspannung herabsetzt oder in den Stromkreis einen Vorwiderstand legt. Freilich wird durch diese Maßnahmen die Funkenbildung herabgesetzt. Zugleich sinkt aber die Abtraggeschwindigkeit. Gibt man jedoch dem Kontaktbelag die erfindungsgemäße Zusammensetzung, so wird die Neigung zur Funkenbildung ohne Beeinträchtigung der Abtraggeschwindigkeit vermindert. Eine physikalische Erklärung hierfür wurde bisher nicht ermittelt. Es wurde ferner gefunden, daß eine Scheibe mit einenx Kontaktbelag aus reiner Bronze beim Schleifen unerwünscht heiß wird, so daß im Werkstück Risse durch Wärmespannungen auftreten, daß jedoch bei gleicher Stromdichte eine erfindungsgemäß gestaltete Scheibe beim Schleifen kalt bleibt. Eine Erklärung hierfür liegt bisher ebenfalls nicht vor.The reduction in spark formation achieved with the disc according to the invention with undiminished removal rate is not based solely on the fact that the electrical The conductivity of the disc is reduced by the aluminum oxide. Because if this were the case, then the same effect should be able to be achieved by reduces the generator voltage or puts a series resistor in the circuit. Of course, these measures reduce the formation of sparks. At the same time it sinks but the removal rate. However, if you give the contact coating according to the invention Composition, the tendency to spark without affecting the Removal speed reduced. A physical explanation for this has been found so far not determined. It has also been found that a disc with a contact coating made of pure bronze becomes undesirably hot during grinding, so that cracks in the workpiece occur due to thermal stresses, but that according to the invention with the same current density designed disc remains cold during grinding. So far, there is an explanation for this also not before.

Endlich wurde gefunden, daß durch das Aluminiumoxyd das Maß der Scheibenabnutzung erheblich heruntergesetzt wird. Schätzungsweise beträgt der Verschleiß- bei einer Scheibe ohne Aluminiumoxyd das .Fünf- bis Zehnfache einer Scheibe mit Aluminiumoxyd.It was finally found that the amount of disc wear was determined by the aluminum oxide is significantly reduced. The wear and tear is estimated at one Disc without aluminum oxide five to ten times that of a disc with aluminum oxide.

Erwähnt sei noch das Ergebnis eines Vergleichsversuchs zwischen einer Scheibe mit einem Belag aus reiner Bronze und einer Scheibe mit Belag aus Bronze nebst Aluminiumoxyd, die unter gleichen Bedingungen gearbeitet hatten.Mention should also be made of the result of a comparison experiment between a Disc with a covering made of pure bronze and a disc with a covering made of bronze together with aluminum oxide, which had worked under the same conditions.

Die erste Scheibe zeigte eine rauhe, unregelmäßige Schleiffläche, die wahrscheinlich durch Funken- und Lichtbogenbildung entstanden war, während die zweite Scheibe eine glatte, von Unregelmäßigkeiten freie -Schleiffläche aufwies. Dabei trifft die naheliegende Vermutung, daß die Schleifleistung der rauhen Scheibe größer ist als die der glatten Scheibe, nicht zu. Viehmehr lehrt die Erfahrung das Gegenteil.The first disc showed a rough, irregular grinding surface, which was probably caused by sparks and arcing, while the second disc had a smooth grinding surface free of irregularities. The obvious assumption is that the grinding performance of the rough wheel is larger than that of the smooth disc, not too. Experience teaches cattle more Opposite.

In der Zeichnung ist schematisch im Schnitt eine erfindungsgemäß gestaltete . Kontaktscheibe dargestellt.In the drawing, an inventive designed is schematically in section . Contact washer shown.

Auf einen Grundkörper:( ist ein Trägerkörper 2, z. B. eine Metallauflage aus Kupfer oder Bronze, durch Pressen oder Sintern aufgebracht. Auf die Metallauflage 2 wird durch Warmpressen, Sintern oder ein anderes Verfahren eine Kontaktschicht 3 aufgebracht, die aus einer Legierung gemäß der Erfindung besteht und in die Schleifkorn aus Diamant, Korund, Spinell oder Siliziumkarbid eingebettet ist.On a base body :( is a support body 2, e.g. a metal support made of copper or bronze, applied by pressing or sintering. On the metal plating 2 becomes a contact layer by hot pressing, sintering or another process 3 applied, which consists of an alloy according to the invention and in the abrasive grain made of diamond, corundum, spinel or silicon carbide is embedded.

Claims (2)

Patentansprüche: 1. Kontaktscheibe für das elektrolytische Schleifen von Werkstücken, die einen Kontaktbelag aus leitenden Werkstoffen und Schleifmittel, wie Diamant, Körund, Spinell, Siliziumkarbid od. dgl., aufweist, d a d u r c h g e k e n n -z e i c h n e t, daß der. Kontaktbelag aus einer bis zu 40 Gewichtsprozent "-Aluminiumoxyd, Rest Metall, enthaltenden Legierung besteht, in die das Schleifkorn eingebettet ist. Claims: 1. Contact disc for electrolytic grinding of workpieces that have a contact layer made of conductive materials and abrasives, such as diamond, grain, spinel, silicon carbide or the like e k e n n -z e i c h n e t that the. Contact coating from one to 40 percent by weight "-Aluminium oxide, the remainder metal, containing alloy in which the abrasive grain is embedded. 2. Kontaktscheibe nach Anspruch 1, dadurch gekennzeichnet, daß der . Kontaktbelag folgende Legierungselemente aufweist: - A120ü . : . . . . . 10 bis 30 Gewichtsprozent, Ag ......... 15 bis-30 Gewichtsprozent, Cu ......... 38 bis 50 Gewichtsprozent, Sn ......... 6 bis 12 Gewichtsprozent.
2. Contact disc according to claim 1, characterized in that the. Contact coating has the following alloy elements: - A120ü. :. . . . . 10 to 30 percent by weight, Ag ......... 15 to -30 percent by weight, Cu ......... 38 to 50 percent by weight, Sn ......... 6 to 12 percent by weight.
DE1961W0031295 1961-12-16 1961-12-16 Contact disc for the electrolytic grinding of workpieces Pending DE1298855B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1961W0031295 DE1298855B (en) 1961-12-16 1961-12-16 Contact disc for the electrolytic grinding of workpieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1961W0031295 DE1298855B (en) 1961-12-16 1961-12-16 Contact disc for the electrolytic grinding of workpieces

Publications (1)

Publication Number Publication Date
DE1298855B true DE1298855B (en) 1969-07-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
DE1961W0031295 Pending DE1298855B (en) 1961-12-16 1961-12-16 Contact disc for the electrolytic grinding of workpieces

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DE (1) DE1298855B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217222A1 (en) * 1985-10-04 1987-04-08 D. Swarovski & Co. Sintered abrasive articles
EP2119524A1 (en) * 2008-05-15 2009-11-18 Celsia S.P.A. Bimetal electrode for erosion grinders and manufacturing method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783199A (en) * 1953-04-13 1957-02-26 Norton Co Electrolytic grinding apparatus
US2793992A (en) * 1953-04-06 1957-05-28 Gen Motors Corp Electrical cutting and grinding
DE1061005B (en) * 1952-11-24 1959-07-09 Deutsche Edelstahlwerke Ag Manufacture of electrodes for spark erosion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061005B (en) * 1952-11-24 1959-07-09 Deutsche Edelstahlwerke Ag Manufacture of electrodes for spark erosion
US2793992A (en) * 1953-04-06 1957-05-28 Gen Motors Corp Electrical cutting and grinding
US2783199A (en) * 1953-04-13 1957-02-26 Norton Co Electrolytic grinding apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0217222A1 (en) * 1985-10-04 1987-04-08 D. Swarovski & Co. Sintered abrasive articles
US4735655A (en) * 1985-10-04 1988-04-05 D. Swarovski & Co. Sintered abrasive material
EP2119524A1 (en) * 2008-05-15 2009-11-18 Celsia S.P.A. Bimetal electrode for erosion grinders and manufacturing method

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