DE19916870C1 - Small cutting wheel is formed as sinter body of hard metal powder, with thick nave area and central have hole, together with all-round cutting edge and increasingly narrowing edge area - Google Patents

Small cutting wheel is formed as sinter body of hard metal powder, with thick nave area and central have hole, together with all-round cutting edge and increasingly narrowing edge area

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Publication number
DE19916870C1
DE19916870C1 DE1999116870 DE19916870A DE19916870C1 DE 19916870 C1 DE19916870 C1 DE 19916870C1 DE 1999116870 DE1999116870 DE 1999116870 DE 19916870 A DE19916870 A DE 19916870A DE 19916870 C1 DE19916870 C1 DE 19916870C1
Authority
DE
Germany
Prior art keywords
area
edge
hard metal
cutting wheel
metal powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE1999116870
Other languages
German (de)
Inventor
Helge Motzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tigra Hartstoff GmbH
Original Assignee
Tigra Hartstoff GmbH
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 Tigra Hartstoff GmbH filed Critical Tigra Hartstoff GmbH
Priority to DE1999116870 priority Critical patent/DE19916870C1/en
Application granted granted Critical
Publication of DE19916870C1 publication Critical patent/DE19916870C1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/10—Glass-cutting tools, e.g. scoring tools
    • C03B33/105—Details of cutting or scoring means, e.g. tips
    • C03B33/107—Wheel design, e.g. materials, construction, shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
    • B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
    • B28D1/225—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising for scoring or breaking, e.g. tiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Abstract

A sinter body of hard metal powder forms a small cutting wheel and has a thick nave area (1) and a central nave hole (2). It has an all-round cutting edge (3), to which an edge area (4) increasingly narrows. The small cutting wheel has a crown of recesses (5) partly penetrating the nave and/or edge areas. The crown has a somewhat spoke wheel-type configuration. To produce the small cutting wheel, a flowable mixture of hard metal powder and paraffin or similar is used in injection molding procedure to form a blank with constant thickness in all areas, which is then sintered.

Description

Die Erfindung betrifft Hartmetall-Schneidrädchen, wie sie beispielsweise für Fliesenschneider eingesetzt werden, und ein Verfahren zu deren Herstellung.The invention relates to carbide cutting wheels, as they can be used for example for tile cutters, and a process for their manufacture.

Derartige Schneidrädchen werden bekanntermaßen als Sinter­ körper aus Hartmetallpulver hergestellt. Sie haben einen eine Nabe bildenden dickeren Mittelteil mit einem zentrischen run­ den Durchgangsloch zur Aufnahme eines Achszapfens, auf dem das Schneidrädchen im Werkzeug, beispielsweise Fliesenschnei­ der, Rohrabschneider oder dgl. , drehbar gelagert werden soll, und aus einem sich zu einer Schneide verjüngenden Randbe­ reich.Such cutting wheels are known as sinter body made of hard metal powder. You have one Hub forming thicker middle section with a centric run the through hole for receiving an axle, on which the cutting wheel in the tool, for example tile cutting which, pipe cutter or the like, is to be rotatably supported, and from an edge tapering to a cutting edge rich.

Die Herstellung solcher Schneidrädchen erfolgt durch Pressen des Hartmetallpulvers in einer Preßform mittels einer Presse zu einem rohen Preßkörper, der sodann im Sinterofen gesintert wird. Den letzten Fertigungsschritt bildet das Schleifen der Schneidkante am Umfang.Such cutting wheels are manufactured by pressing the hard metal powder in a mold by means of a press to a raw compact, which is then sintered in the sintering furnace becomes. The final manufacturing step is grinding the Cutting edge on the circumference.

Da Hartmetallpulver ein teurer Rohstoff ist, wäre es wün­ schenswert, den Materialaufwand zu senken.Since carbide powder is an expensive raw material, it would be nice it is worthwhile to reduce the cost of materials.

Diese Aufgabe wird erfindungsgemäß durch das im Patentan­ spruch angegebene Hartmetall-Schneidrädchen sowie das im Patentanspruch 2 angegebene Verfahren zur Herstellung eines solchen Hartmetall-Schneidrädchens gelöst.This object is achieved by the patent saying specified carbide cutting wheels and the im Claim 2 specified method for producing a  such carbide cutting wheel solved.

Das erfindungsgemäße Hartmetall-Schneidrädchen ist also nicht vollständig massiv ausgebildet, sondern ist gewissermaßen in Gestalt eines Speichenrads mit einem Kranz von Aussparungen ausgebildet, wodurch eine beträchtliche Materialersparnis er­ reicht wird. Auf die Brauchbarkeit des Schneidrädchens haben diese Aussparungen keinen Einfluß.The carbide cutting wheel according to the invention is therefore not completely solid, but is in a way in Shape of a spoked wheel with a ring of recesses trained, thereby saving considerable material is enough. Have on the usability of the cutting wheel these recesses have no effect.

Wesentlich bei der Erfindung ist die Herstellung des Schneid­ rädchenrohlings in einem Spritzgießverfahren anstelle des herkömmlichen Formpreßverfahrens. Es hat sich nämlich ge­ zeigt, daß das Problem nicht einfach dadurch bewältigt werden kann, daß der Formpreßkörper mit entsprechenden Aussparungen, also unter Verwendung einer entsprechenden Preßform herge­ stellt wird. Denn es hat sich herausgestellt, daß ein aus einem formgepreßten Rohling hergestellter Sinterkörper unrund wird. Dies rührt daher, daß die Dichte des gepreßten Rohlings in dem zunehmend verjüngten Randbereich größer als in dem dickeren Mittenbereich ist, was zu unterschiedlichem Schwund­ verhalten beim Sintervorgang führt. Der dann notwendige er­ hebliche Schleifaufwand, um den unrunden Sinterkörper rund zu schleifen, erfordert bedeutend mehr Aufwand, als es der er­ zielten Materialersparnis entsprechen würde.The production of the cutting is essential in the invention wheel blanks in an injection molding process instead of conventional compression molding process. It has happened shows that the problem cannot be solved simply by this can that the molded body with appropriate recesses, So using an appropriate mold Herge is posed. Because it turned out that one out a molded sintered body out of round becomes. This is because the density of the pressed blank larger in the increasingly tapered edge area than in the thicker center area is what leads to different shrinkage behavior during the sintering process. The then necessary he considerable grinding effort to round the non-round sintered body grinding requires significantly more effort than he does targeted material savings would correspond.

Das erfindungsgemäße Verfahren der Herstellung des Rohlings im Spritzgußverfahren aus einer dazu hergestellten fließfähi­ gen Mischung aus Hartmetallpulver und Paraffin oder dgl. er­ gibt jedoch einen Rohling mit in allen seinen Teilen gleich­ förmiger Rohdichte und damit gleichförmigem Schwundverhalten beim Sintervorgang, so daß ein trotz der Aussparungen runder Sinterkörper entsteht, vergleichbar dem aus einem formgepreß­ ten massiven Rohling hergestellten Sinterkörper, so daß kein größerer Schleifaufwand zum Schleifen der Schneidkante erfor­ derlich ist.The inventive method of producing the blank in the injection molding process from a flowable produced for this purpose mixture of hard metal powder and paraffin or the like but gives a blank with the same in all its parts shaped bulk density and thus uniform shrinkage behavior during the sintering process, so that a round despite the cutouts Sintered body arises, comparable to that from a compression molding ten solid blank sintered body, so that no Larger grinding effort required to grind the cutting edge is such.

In der anliegenden Zeichnung zeigen die Fig. 1A und 1B in An­ sicht bzw. im Schnitt ein herkömmliches massives Schneidräd­ chen mit einem dicken Nabenbereich 1, der ein zentrisches Nabenloch 2 aufweist, und einem sich zu einer umlaufenden Schneidkante 3 hin zunehmend verjüngenden Randbereich 4. Da die Zeichnung das Rohteil (vor dem Schleifen der Schneidkante 3) zeigt, ist die Schneidkante 3 in ihrer stumpfen Rohform sichtbar.In the accompanying drawing, FIGS. 1A and 1B view in An or surfaces in section a conventional solid Schneidräd with a thick boss portion 1, which has a centric hub hole 2, and to a peripheral cutting edge 3 towards increasingly tapered edge region 4. Since the drawing shows the blank (before grinding the cutting edge 3 ), the cutting edge 3 is visible in its blunt raw shape.

In der Zeichnung zeigen die Fig. 2A und 2B eine Ansicht bzw. einen Schnitt des erfindungsgemäßen Schneidrädchens, wobei gleiche Teile mit gleichen Bezugszeichen versehen sind. Das erfindungsgemäße Schneidrädchen hat also wiederum einen dicken Nabenbereich 1 mit einem zentrischen Nabenloch 2 und einen sich zu einer umlaufenden Schneidkante 3 hin zunehmend verjüngenden Randbereich 4. Jedoch ist bei dem erfindungsge­ mäßen Schneidrädchen ein Kranz von Aussparungen 5 vorgesehen, die sowohl den Nabenbereich 1 als auch den Randbereich 4 je­ weils teilweise durchsetzen und dem Schneidrädchen eine speichenradartige Konfiguration geben. Auch hier ist die Schneidkante 3 im stumpfen, ungeschliffenen Rohzustand darge­ stellt.In the drawing, Fig. 2A and 2B are a view and a section of the cutting wheel of the invention show, wherein like parts are provided with the same reference numerals. The cutting wheel according to the invention therefore again has a thick hub area 1 with a central hub hole 2 and an edge area 4 which tapers increasingly towards a circumferential cutting edge 3 . However, a ring of recesses 5 is provided in the cutting wheel according to the invention, which both partially penetrate both the hub area 1 and the edge area 4 and give the cutting wheel a spoke wheel-like configuration. Again, the cutting edge 3 in the blunt, uncut raw state Darge presents.

Die Aussparungen 5 können, je nach den Anforderungen an das Schneidrädchen in Bezug auf Belastbarkeit im Einsatzfall, größer oder kleiner und in größerer oder kleinerer Anzahl vorgesehen werden. Abweichend von der dargestellten Ausfüh­ rungsform können die Aussparungen auch kreisrund oder oval ausgebildet sein.The recesses 5 can, depending on the requirements of the cutting wheel with regard to load capacity in the application, be provided larger or smaller and in larger or smaller numbers. Deviating from the embodiment shown, the recesses can also be circular or oval.

Während das herkömmliche Schneidrädchen nach den Fig. 1A und 1B durch Herstellen eines Preßkörperrohlings aus Hartmetall­ pulver und anschließendes Sintern dieses Preßkörperrohlings hergestellt ist, ist das erfindungsgemäße Schneidrädchen nach den Fig. 2A und 2B durch Spritzgießen eines Rohlings aus einem entsprechend fließfähigen Hartmetallpulver-Paraffin- Gemisch und anschließendes Sintern dieses Rohlings herge­ stellt.While the conventional cutting wheel according to FIGS. 1A and 1B by making a Preßkörperrohlings of hard metal powder and then sintering is made this Preßkörperrohlings, cutting wheel of the invention is shown in FIGS. 2A and 2B by injection molding of a blank of a suitably flowable hard metal powder-paraffin mixture and then sintering this blank Herge provides.

Claims (2)

1. Hartmetall-Schneidrädchen in Form eines Sinterkörpers aus Hartmetallpulver, mit einem dicken Nabenbereich (1) und einem zentrischen Nabenloch (2) sowie einem sich zur umlaufenden Schneidkante (3) hin zunehmend verjüngenden Randbereich (4), dadurch gekennzeichnet, daß das Schneidrädchen durch Anordnen eines Kranzes von den Nabenbereich und/oder den Randbereich jeweils teilweise durchsetzenden Aussparungen (5) mit einer etwa speichenradartigen Konfiguration ausgebildet ist.1. Tungsten carbide cutting wheel in the form of a sintered body made of hard metal powder, with a thick hub area ( 1 ) and a central hub hole ( 2 ) as well as an increasingly tapering edge area ( 4 ) towards the circumferential cutting edge ( 3 ), characterized in that the cutting wheel is characterized by Arranging a ring of recesses ( 5 ) which partially penetrate the hub area and / or the edge area is configured with an approximately spoke wheel-like configuration. 2. Verfahren zur Herstellung eines Hartmetall-Schneidrädchens nach Anspruch 1, dadurch gekennzeichnet, daß aus einem ent­ sprechend fließfähigen Gemisch aus Hartmetallpulver und Paraffin oder dgl. im Spritzgußverfahren ein Rohling mit in allen Bereich konstanter Dichte hergestellt und dieser Roh­ ling gesintert wird.2. Method of making a hard metal cutting wheel according to claim 1, characterized in that from an ent speaking flowable mixture of hard metal powder and Paraffin or the like. In the injection molding process, a blank with in all area of constant density and this raw ling is sintered.
DE1999116870 1999-04-14 1999-04-14 Small cutting wheel is formed as sinter body of hard metal powder, with thick nave area and central have hole, together with all-round cutting edge and increasingly narrowing edge area Expired - Fee Related DE19916870C1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1999116870 DE19916870C1 (en) 1999-04-14 1999-04-14 Small cutting wheel is formed as sinter body of hard metal powder, with thick nave area and central have hole, together with all-round cutting edge and increasingly narrowing edge area

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999116870 DE19916870C1 (en) 1999-04-14 1999-04-14 Small cutting wheel is formed as sinter body of hard metal powder, with thick nave area and central have hole, together with all-round cutting edge and increasingly narrowing edge area

Publications (1)

Publication Number Publication Date
DE19916870C1 true DE19916870C1 (en) 2000-07-27

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071724A1 (en) * 2007-12-05 2009-06-11 Germans Boada, S.A. Cutting tool for handheld ceramic cutters

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0409646A2 (en) * 1989-07-20 1991-01-23 Sumitomo Metal Mining Company Limited Compound for an injection molding
US5030677A (en) * 1988-10-18 1991-07-09 Sumitomo Metal Mining Company Limited Composition for injection moulding
EP0468467A2 (en) * 1990-07-24 1992-01-29 Citizen Watch Co., Ltd. Process for producing precision metal parts by powder moulding
DE4318170A1 (en) * 1992-06-02 1993-12-09 Advanced Materials Tech Injection moldable metal insert and method of making an injection molded metal object

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5030677A (en) * 1988-10-18 1991-07-09 Sumitomo Metal Mining Company Limited Composition for injection moulding
EP0409646A2 (en) * 1989-07-20 1991-01-23 Sumitomo Metal Mining Company Limited Compound for an injection molding
EP0468467A2 (en) * 1990-07-24 1992-01-29 Citizen Watch Co., Ltd. Process for producing precision metal parts by powder moulding
DE4318170A1 (en) * 1992-06-02 1993-12-09 Advanced Materials Tech Injection moldable metal insert and method of making an injection molded metal object

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP 06322407 A.,In: Patent Abstracts of Japan vom 22.11.94 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009071724A1 (en) * 2007-12-05 2009-06-11 Germans Boada, S.A. Cutting tool for handheld ceramic cutters
ES2326581A1 (en) * 2007-12-05 2009-10-14 Germans Boada S.A. Cutting tool for handheld ceramic cutters

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D1 Grant (no unexamined application published) patent law 81
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8339 Ceased/non-payment of the annual fee