EP0612586B1 - Abrasive disc for power grinder, especially cutting-off disc - Google Patents

Abrasive disc for power grinder, especially cutting-off disc Download PDF

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Publication number
EP0612586B1
EP0612586B1 EP94100690A EP94100690A EP0612586B1 EP 0612586 B1 EP0612586 B1 EP 0612586B1 EP 94100690 A EP94100690 A EP 94100690A EP 94100690 A EP94100690 A EP 94100690A EP 0612586 B1 EP0612586 B1 EP 0612586B1
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EP
European Patent Office
Prior art keywords
abrasive
wheel according
ring
support
abrasive wheel
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 - Lifetime
Application number
EP94100690A
Other languages
German (de)
French (fr)
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EP0612586A1 (en
Inventor
Peter Alfer
Diethard Dr. Sinram
Theodor Schneider
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.)
August Rueggeberg GmbH and Co KG
Original Assignee
August Rueggeberg GmbH and Co KG
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
Priority claimed from DE4311529A external-priority patent/DE4311529A1/en
Application filed by August Rueggeberg GmbH and Co KG filed Critical August Rueggeberg GmbH and Co KG
Priority to EP97121891A priority Critical patent/EP0832720A3/en
Publication of EP0612586A1 publication Critical patent/EP0612586A1/en
Application granted granted Critical
Publication of EP0612586B1 publication Critical patent/EP0612586B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24D5/16—Bushings; Mountings
    • 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
    • B24D18/0081—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for of wire-reinforced grinding tools
    • 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
    • B24D5/12—Cut-off wheels

Definitions

  • the invention relates to a grinding wheel according to the preamble of the claim 1 as e.g. known from US-A-3,487,590.
  • Such grinding wheels are only used up to a range of 50 to 70% of the original diameter worn. So it will be a considerable one Part of the grinding wheel not used. This one not used The proportion of the grinding wheel is in a range of 30 to 50% of the Original weight of the grinding wheel. This remaining remainder must be over Hazardous waste landfills are being disposed of, which poses increasing problems since the number of hazardous waste landfills is declining and there the cost for this rises sharply. The reason for the relatively high remaining The rest of the unused grinding wheel is that the grinding wheel on the grinding spindles or shafts of hand-held grinding machines clamped between the flange plates on the end faces that are spread over a substantial portion of the diameter extend the grinding wheel.
  • the grinding wheels are clamped necessary, because the fabric reinforcements only then the tangential forces can record if they have a sufficient radial range - Starting from their inner recess - are clamped. Furthermore, these reinforcement layers are necessary because such grinding wheels for hand-held grinding machines, considerable lateral forces have to be able to take up, namely when used as a rough grinding wheel as well as a cutting wheel. In addition, you can do not immerse the flange plates in the workpiece when grinding. In addition, the part of the radially projecting over these flanges Cutting wheel is not consumed, which corresponds to the workpiece thickness.
  • the post-published older European patent application EP 0 530 691 A discloses a grinding wheel that has a central support and a detachably and interchangeably attached slip ring, the one hand abuts a ring flange connected to the carrier and clamped against it by means of a clamping ring with a clamping flange becomes.
  • From US-A-3 487 590 is a grinding wheel with an inner support body and with one connected to it, a synthetic resin bond of Known abrasive grain slip ring.
  • the ring disk-shaped trained slip ring has a concentric to a central longitudinal axis trained recess in which the annular disc-shaped Support body arranged and connected to the slip ring.
  • Of the Support body is made of steel, iron or aluminum.
  • the invention has for its object a grinding wheel of the generic type To create the type of waste to be disposed of is greatly reduced.
  • the support body can either be reused or at least be recycled; in addition, the slip ring can be practical completely processed, i.e. used up.
  • the further development according to claim 7 is expedient, to be able to use up the slip ring completely.
  • the supporting body only needs to be cleaned slightly and can then be reused or an existing recycling process, for example as steel scrap.
  • Claims 9 to 12 give particularly advantageous refinements for Reinforcement layers that enable the slip rings to be covered to give large recess on the outer diameter, which in turn the The reason for this is that if the slip ring is completely used up is achieved.
  • a grinding wheel which is a Cut-off wheel for a hand-held grinding machine.
  • she has an annular cylindrical slip ring 1, in which also ring-cylindrical support body 2 is glued.
  • the slip ring 1 has one circular recess 3, which is concentric to the central longitudinal axis 4 is formed.
  • the support body 2 is inserted into this recess 3.
  • the diameter of the recess 3, i.e. the inner diameter Di of the slip ring 1 is a few tenths of a millimeter larger than the outside diameter d of the support body 2.
  • the slip ring 1 has an outer diameter Da on, where the relationship Da / Di applies: 1.4 ⁇ Da / Di ⁇ 2, i.e. the slip ring 1 has one based on its Outside diameter Since relatively large recess 3.
  • For hand cutting discs applies 100 mm ⁇ Da ⁇ 300 mm.
  • the thickness a of the slip ring 1 in the direction of the axis 4 is in the range from 2.0 mm to 4.0 mm and is greater than the thickness b of the supporting body 2 in the direction of the axis 4, so that the slip ring 1 with both ends 5, 5 'protrudes over the end faces 6, 6' of the support body 2.
  • the thickness of the support body 2 in the direction of the axis 4 equal to Thickness of the slip ring 1, wherein the slip ring 1 and Support body 2 are arranged plane-parallel to each other; for cutting discs but it is advantageous if the thickness b of the support body 2 in the direction the axis 4 is a little less than the thickness a of the slip ring 1 Immersion of the cutting wheel in a workpiece to be cut to enable or facilitate.
  • the slip ring 1 and the support body 2 are preferably together using a suitable adhesive Epoxy resin.
  • the support body 2 has a receiving opening formed concentrically to the axis 4 13 for the drive shaft of a hand-held grinding machine on.
  • the support body 2 is made of metal, usually from steel. It is made from sheet metal by punching or turning.
  • the slip ring 1 has the usual basic structure, i.e. it has a reinforcement layer in the area of the end faces 5, 5 ' 14, 14 ', which is designed in a manner to be described is.
  • Abrasive grain is located between the reinforcement layers 14, 14 ' 15, preferably made of aluminum oxide, silicon carbide, zirconium corundum, sol gel grain or mixtures thereof and binder 16 in the form of pure or modified Synthetic resins and fillers 17, e.g. Pyrite or cryolite.
  • the Abrasive grain 15 has a nominal grain size in the range from 315 to 1000 ⁇ m.
  • FIG. 3 shows a reinforcement layer 14 described in DE 38 19 199 C2 or 14 ', which is preferred instead of a fabric in such slip rings 1, in particular to use with hand-cut grinding wheels is.
  • a reinforcement layer 14 or 14 ' is made of one or a plurality of reinforcing threads 18 are formed, which are optimally tangential and counteract radial expansion of the slip ring 1.
  • the reinforcing threads 18 run in the area of a central opening 19 exactly tangential; they then run radially tangentially to the outer circumference and are redirected there and again straight to the opening 19 returned to where they passed tangentially. You run with it essentially according to the actual stress on the rotating Slip rings 1.
  • the greatest principal tension of a rotating The slip ring runs in the tangential direction.
  • the tangential tension i.e. the tangential force curve has in the area of the opening 19, that is radially inside in the area of the inner peripheral surface 8 of the slip ring 1, their highest value, which steadily decreases towards the outside.
  • the reinforcing threads 18 only in the area the opening 19 are exactly tangential, but that they are between the opening 19 and outer edge received a radial component to the in this Counteract also strong radial tension in the area.
  • the reinforcement threads 18 are at the respective crossing points 20 with each other connected, namely by a synthetic resin. The reinforcing threads 18 are before laying to the pattern shown in Fig.
  • the Reinforcement layer 14 or 14 ' is therefore sufficiently inherently stable to Production of a slip ring 1 to be used.
  • the inside diameter D'i of the reinforcement layer 14 or 14 ' corresponds to essentially the inner diameter Di of the slip ring 1. Corresponding applies to the ratio of the outer diameter D'a of the reinforcement layer 14 or 14 'in relation to the diameter Da of the slip ring 1.
  • Die Vertex angle c of the reinforcing threads 18 in the region of the deflection points 21 align when the radius of curvature, not shown, in the range of Deflection points 21 is neglected, only according to the ratio from D'a to D'i. Since the reinforcing threads 18 are essentially like that Legs of an isosceles triangle are arranged also from a triangle.
  • a reinforcement layer 14 or 14 ' is shown, which is very special preferably instead of a fabric in the slip rings described 1 of cut-off wheels for hand-held grinding machines are.
  • the reinforcing threads 18 in each case from the central opening 19 in accordance with the resultant the main stress direction. 4 is the course of such Reinforcement thread shown in reinforced lines. He begins - with mirror-symmetrical design - tangential in the area opening 19 and is such in slightly more than a half-spiral rotation led to the outer deflection point 21 that he already there again has an approximately tangential course.
  • Reinforcing thread 18 approximates only point-wise at the central opening 19 on. It follows that there is no excessive accumulation of material the reinforcing threads 18 occurs in the region of the opening 19. this fact and the described course of the reinforcing threads leave them Reinforcement layer 14 or 14 'appear even more advantageous than the reinforcement layer 3.
  • the Slip ring 1 designed in the same way as in the embodiment 1 and 2.
  • the support body 2 ' is also disc-shaped formed as shown in Fig. 1, wherein for the thicknesses a and b the above statements apply. It is made of die-cast zinc and is produced by injection into the recess 3 of the slip ring 1.
  • the zinc penetrates according to the enlarged detail 6 in the region of the recess 3 in cavities 22 between the Abrasive grit 15 or binder 16 and fillers 17, thereby a high-strength positive connection between support body 2 'and slip ring 1 is effected.
  • a reinforcement layer 14 ' is placed in a press mold. Subsequently, an abrasive granulate consisting of abrasive grain 15, filler 17 and binder 16 is introduced into the mold and another reinforcement layer 14 is placed on it. A pressure of 500 to 4000 N / cm 2 is then exerted on this package, as a result of which the slip ring 1 is compressed. During this compression, an adhesive bond occurs, which is referred to as green strength. During this pressing, the abrasive granules, ie abrasive grain 15, binding agent 16 and filler 17, each press outward through the reinforcing layer 14 or 14 '.
  • this finished hardened slip rings 1 is a support body 2 glued in the manner already described.
  • the the adhesive layer 10 and the adhesive seams 12 forming adhesive is then in cured in a continuous furnace at about 120 ° C.
  • Example I The production of the slip ring 1 up to the compression takes place as for Example I. Then before the hardening of the slip ring 1 Support body 2 glued in the manner described. The slip ring 1 and support body 2 existing grinding wheel is then between steel plates stacked and placed in an oven for curing as in Example I, now simultaneously the binder 16 of the slip ring 1 and the adhesive of the adhesive layer 10 and the adhesive seams 12 at temperatures between 120 ° C and 200 ° C - depending on the desired degree of hardness - be cured.
  • the slip ring 1 is produced as in Example I. Then this slip ring 1 is in an injection mold of a zinc injection molding machine inserted and the support body 2 'produced by injection. Because of the high cooling rate of the zinc does not occur thermally conditional damage to the slip ring 1 and in particular the binder 16.
  • the slip ring 1 can also be in a known manner have internal reinforcement layer.
  • the grinding wheel can be used until the grinding ring has been completely processed 1 are used, especially when used as a cutting wheel, because they are created in a cut-off on the workpiece Gap can dip without collisions between the support body 2 and the machined workpiece can occur.
  • Remains of the slip ring 1 and the adhesive layer 10 and the adhesive seams 12 can by heating the remaining support body 2 and can be removed by subsequent brushing with steel brushes. The Support body 2 can then be used again. Should they be damaged they can be easily recycled.
  • slip ring 1 and on the other hand has a support body 2 ''.
  • the slip ring Its structure corresponds essentially to that described above Structure, wherein it is provided with reinforcing layers 14, 14 ', as in 4 and are described above for this purpose.
  • the support body 2 '' consists of a relatively thin sheet of steel, if necessary stainless steel, aluminum or brass, whose thickness e applies 0.4 mm ⁇ e ⁇ 1.0 mm, whereby applies to practical cases 0.5 mm ⁇ e ⁇ 0.8 mm.
  • the very thin support body 2 '' is a ring-cylindrical Edge 24 flanged, its extension b in the direction of axis 4 is equal to or slightly less than the thickness a of the slip ring 1.
  • an outer peripheral surface 9 '' is connected to the slip ring 1.
  • the slip ring 1 is immediately on the outer peripheral surface 9 ′′ of the ring-cylindrical edge 24, which is further explained in the following description of the manufacture becomes.
  • the cutting grinding wheel, as shown in FIGS. 7 and 8 is against lateral forces, i.e.
  • the grinding wheel is flexible, i.e. with lateral bending forces there are no jumps in the bending stress curve in the area of the edge 24, so that the risk of bending due to parallel lateral forces acting on axis 4 are not given.
  • the slip ring 1 is flexible for such forces, which on the one hand on the synthetic resin bond of the slip ring 1 and on the other hand on the The presence of the reinforcement layers 14, 14 'can be traced back.
  • the thickness e of the support body 2 '' must be small; on the other hand, the edge 24 is necessary so that the outer peripheral surface 9 '' has a sufficient axial extent b around that from the slip ring 1 on the support body 2 '' to be transmitted torsional forces and also those mentioned Transfer side bending forces from slip ring 1 to support body 2 '' to be able to.
  • the thickness a of the slip ring 1 of cutting grinding wheels is in the range of 2 to 4 mm. It follows that the Thickness e of the supporting body 2 ′′ is considerably less than the thickness a of the Slip ring 1. The following applies: 0.1 a ⁇ e ⁇ 0.25a. For the axial extension b of margin 24 applies that it should be only slightly smaller than that Thickness a. Here 0.8 a ⁇ b ⁇ 1.0 a applies.
  • the ratio Da / Di ⁇ 2 also applies to this cutting wheel and in particular applies 1.4 ⁇ Da / Di ⁇ 2.
  • the special spiral laying according to Fig. 4 allows the recess 3 of the slip ring 1 relative to Outside diameter Da to make very large, which again leads to the fact that the slip ring 1 are completely used up during cut-off grinding can, so far that at the edge 24 no residues of the slip ring 1 more remain. This is due to the fact that by the end of the Grinding insert in the slip ring 1 is a reinforcement, the Reinforcement threads 18 run in this area purely tangential and therefore the high tangential forces occurring here in a particularly favorable manner be able to record.
  • the support body 2 '' should undergo a surface treatment have been subjected to surface oxidation, in particular Rust formation in non-stainless steel, counteracts.
  • surface oxidation in particular Rust formation in non-stainless steel
  • Nickel plating or copper plating of the support body 2 ′′ into consideration, in particular but also a plasma polymer treatment of the support body 2 ′′, because of such treatment, on the one hand, an extreme cleaning takes place and on the other hand a particularly high adhesiveness is achieved, which is particularly favorable for the outer peripheral surface 9 ''.
  • the outer peripheral surface 9 ′′ is provided with a thin layer 25 of elasticized phenol-formaldehyde adhesive, which has the function of an adhesion promoter and is not absolutely necessary. Then the support body 2 ′′ is placed in a mold, with its end face 6 ′′ facing away from the edge 24 being placed on the bottom of the mold, ie the edge 24 stands up. Then a reinforcement layer 14 'is inserted, the opening 19 of which is completely filled by the supporting body 2''. Then grinding granulate is filled into the mold and combed or knife.
  • This grinding granulate consists of the abrasive grain 15 already described with a nominal grain size in the range of 600 microns, binder 16 and filler 17, the binder also being a phenol-formaldehyde adhesive, which is generally identical to that from which the Layer 25 exists. In any case, it should be a curing polycondensation adhesive.
  • the second reinforcement layer 14 is placed on the combed or scraped-in layer of the grinding granulate. The grinding granulate is then pressed with the supporting body 2 ′′ under a pressure of 500 to 4000 N / cm 2 .
  • abrasive grain 15 presses into the layer 25 on the one hand and also into the outer peripheral surface 9 ′′ of the edge 24, as a result of which a particularly firm tooth-like connection between the slip ring 1 and the support body 2 ′′ is achieved.
  • These compacted but not yet hardened grinding wheels are stacked between steel plates and placed in an oven for hardening and hardened at temperatures between 120 and 200 ° C, depending on the desired degree of hardness. The connection between the slip ring 1 and the support body 2 ′′ on the one hand and the hardening of the grinding granulate on the other hand is thus carried out in one operation.
  • the slip ring 1 itself should have as hard a binder 16 as possible, on the one hand to prevent lubrication during the grinding process and on the other hand ensure premature breakout of the abrasive grain 15 so that a Self-sharpening of the grinding wheel is achieved.
  • Binder should not be so hard or brittle that breaking off the Slip ring 1 from the support body 2 '' can occur.
  • Polycondensation adhesives with numerous modification options have here as proven particularly advantageous.

Abstract

An abrasive disc, in particular a cutting-off disc, has an annular-cylindrical inner supporting body (2) made of metal and an abrasive ring (1) surrounding the latter, these being interconnected. The abrasive ring (1) projects beyond the supporting body (2) on both sides in the direction of the common axis (4). The abrasive ring (1) can be worn down completely. The supporting body (2) is reusable or at least recyclable. <IMAGE>

Description

Die Erfindung betrifft eine Schleifscheibe nach dem Oberbegriff des Anspruches 1, wie sie z.B. aus der US-A-3 487 590 bekannt mit.The invention relates to a grinding wheel according to the preamble of the claim 1 as e.g. known from US-A-3,487,590.

Derartige Schleifscheiben werden nur bis zu einem Bereich von 50 bis 70% des ursprünglichen Durchmessers abgenutzt. Es wird also ein beträchtlicher Teil der Schleifscheibe nicht ausgenutzt. Dieser nichtverbrauchte Anteil der Schleifscheibe liegt in einem Bereich von 30 bis 50% des Ursprungsgewichtes der Schleifscheibe. Dieser verbleibende Rest muß über Sondermülldeponien entsorgt werden, was zunehmend Probleme aufwirft, da die Zahl der Sondermülldeponien rückläufig ist und da der Kostenaufwand hierfür stark ansteigt. Der Grund für den relativ hohen verbleibenden Rest an nicht verbrauchter Schleifscheibe liegt darin, daß die Schleifscheiben auf den Schleifspindeln bzw. -wellen von handgeführten Schleifmaschinen zwischen an den Stirnseiten anliegenden Flanschplatten eingespannt werden, die sich über einen beträchtlichen Teil des Durchmessers der Schleifscheibe erstrecken. Das Einspannen der Schleifscheiben ist notwendig, da die Gewebe-Armierungen nur dann die auftretenden Tangentialkräfte aufnehmen können, wenn sie über einen ausreichenden Radialbereich - ausgehend von ihrer inneren Ausnehmung - eingespannt sind. Weiterhin sind diese Armierungslagen notwendig, da derartige Schleifscheiben für handgeführte Schleifmaschinen in erheblichem Maße Seitenkräfte aufnehmen können müssen, und zwar beim Einsatz als Schrupp-Schleifscheibe wie auch als Trenn-Schleifscheibe. Darüber hinaus können die Flanschplatten beim Trennschleifen nicht in das Werkstück eintauchen. Zusätzlich kann auch der über diese Flansche radial vorstehende Teil der Trenn-Schleifscheibe nicht verbraucht werden, der der Werkstückdicke entspricht. Such grinding wheels are only used up to a range of 50 to 70% of the original diameter worn. So it will be a considerable one Part of the grinding wheel not used. This one not used The proportion of the grinding wheel is in a range of 30 to 50% of the Original weight of the grinding wheel. This remaining remainder must be over Hazardous waste landfills are being disposed of, which poses increasing problems since the number of hazardous waste landfills is declining and there the cost for this rises sharply. The reason for the relatively high remaining The rest of the unused grinding wheel is that the grinding wheel on the grinding spindles or shafts of hand-held grinding machines clamped between the flange plates on the end faces that are spread over a substantial portion of the diameter extend the grinding wheel. The grinding wheels are clamped necessary, because the fabric reinforcements only then the tangential forces can record if they have a sufficient radial range - Starting from their inner recess - are clamped. Furthermore, these reinforcement layers are necessary because such grinding wheels for hand-held grinding machines, considerable lateral forces have to be able to take up, namely when used as a rough grinding wheel as well as a cutting wheel. In addition, you can do not immerse the flange plates in the workpiece when grinding. In addition, the part of the radially projecting over these flanges Cutting wheel is not consumed, which corresponds to the workpiece thickness.

Die nachveröffentlichte ältere europäische Patentanmeldung EP 0 530 691 A offenbart eine Schleifscheibe, die einen zentrischen Träger und einen hieran lösbar und auswechselbar befestigten Schleifring aufweist, der einerseits an einem mit dem Träger verbundenen Ring-Flansch anliegt und mittels eines Spannrings mit einem Spann-Flansch hiergegen verspannt wird.The post-published older European patent application EP 0 530 691 A discloses a grinding wheel that has a central support and a detachably and interchangeably attached slip ring, the one hand abuts a ring flange connected to the carrier and clamped against it by means of a clamping ring with a clamping flange becomes.

Aus US-A-3 487 590 ist eine Schleifscheibe mit einem inneren Tragkörper und mit einem mit diesem verbundenen, eine Kunstharzbindung des Schleifkorns aufweisenden Schleifring bekannt. Der ringscheibenförmig ausgebildete Schleifring weist eine konzentrisch zu einer Mittel-Längs-Achse ausgebildete Ausnehmung auf, in der der ringscheibenförmig ausgebildete Tragkörper angeordnet und mit dem Schleifring verbunden ist. Der Tragkörper besteht aus Stahl, Eisen oder Aluminium. From US-A-3 487 590 is a grinding wheel with an inner support body and with one connected to it, a synthetic resin bond of Known abrasive grain slip ring. The ring disk-shaped trained slip ring has a concentric to a central longitudinal axis trained recess in which the annular disc-shaped Support body arranged and connected to the slip ring. Of the Support body is made of steel, iron or aluminum.

Der Erfindung liegt die Aufgabe zugrunde, eine Schleifscheibe der gattungsgemäßen Art zu schaffen, bei der die zu entsorgende Abfallmenge stark reduziert ist.The invention has for its object a grinding wheel of the generic type To create the type of waste to be disposed of is greatly reduced.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruches 1 gelöst. Durch die erfindungsgemäße Ausgestaltung kann der Tragkörper entweder wiederverwendet werden oder aber zumindest recycelt werden; darüber hinaus kann der Schleifring praktisch vollständig abgearbeitet, also verbraucht, werden. Für den Einsatz als Trenn-Schleifscheibe ist die Weiterbildung nach Anspruch 7 zweckmäßig, um den Schleifring vollständig verbrauchen zu können. Der Tragkörper braucht nur geringfügig gereinigt zu werden und kann dann wiederverwendet oder einem bestehenden Recyclingverfahren zugeführt werden, beispielsweise als Stahlschrott.This object is achieved by the features of claim 1 solved. Through the configuration according to the invention the support body can either be reused or at least be recycled; in addition, the slip ring can be practical completely processed, i.e. used up. For use as Cutting-off grinding wheel, the further development according to claim 7 is expedient, to be able to use up the slip ring completely. The supporting body only needs to be cleaned slightly and can then be reused or an existing recycling process, for example as steel scrap.

Die Ansprüche 9 bis 12 geben besonders vorteilhafte Ausgestaltungen für Armierungslagen an, die es ermöglichen, den Schleifringen eine bezogen auf den Außendurchmesser große Ausnehmung zu geben, die wiederum die Ursache dafür ist, daß bei ein vollständiges Aufbrauchen des Schleifrings erreicht wird.Claims 9 to 12 give particularly advantageous refinements for Reinforcement layers that enable the slip rings to be covered to give large recess on the outer diameter, which in turn the The reason for this is that if the slip ring is completely used up is achieved.

Durch eine besondere Art der Herstellung ist es möglich, eine besonders intensive Verzahnung von Schleifring und Tragkörper nach Anspruch 13 zu erreichen. Die Auswahl des Bindemittels des Schleifringes nach Anspruch 14 führt dazu, daß der Schleifring einerseits ausreichend hart ist, so daß er nicht schmiert und gleichzeitig selbstschärfend ist; andererseits ist die notwendige Biegeelastizität gegeben und die notwendige Festigkeit der Verbindung zwischen Schleifring und Tragkörper. Anspruch 15 gibt eine Maßnahme zur Verbesserung der Haftung zwischen Schleifring und Tragkörper an.Through a special way of manufacturing it is possible to make a special one intensive interlocking of slip ring and support body according to claim 13 to reach. The selection of the binder of the slip ring according to claim 14 leads to the slip ring on the one hand is sufficiently hard that it does not smear and at the same time is self-sharpening; on the other hand is the necessary bending elasticity given and the necessary strength of the connection between slip ring and support body. Claim 15 gives a measure for improvement the adhesion between slip ring and support body.

Weitere Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der Zeichnung. Es zeigen

Fig. 1
eine Trenn-Schleifscheibe mit eingeklebtem Tragkörper im Querschnitt,
Fig. 2
einen Teilausschnitt aus Fig. 1 in vergrößertem Maßstab,
Fig. 3
eine Draufsicht auf eine in Dreieckslegung gebildete Armierungslage für die Trenn-Schleifscheibe,
Fig. 4
eine Draufsicht auf eine in Spirallegung gebildete Armierungslage für die Trenn-Schleifscheibe,
Fig. 5
eine weitere Ausführungsform einer Trenn-Schleifscheibe mit eingegossenem Tragkörper im Querschnitt,
Fig. 6
einen Teilausschnitt aus Fig. 5 in vergrößertem Maßstab,
Fig. 7
einen Teil-Querschnitt durch eine weitere Ausführungsform einer Trenn-Schleifscheibe und
Fig. 8
einen Teilausschnitt aus Fig. 7 in vergrößertem Maßstab.
Further advantages and details of the invention emerge from the following description of exemplary embodiments with reference to the drawing. Show it
Fig. 1
a cutting wheel with cross section glued in,
Fig. 2
2 shows a partial section from FIG. 1 on an enlarged scale,
Fig. 3
a plan view of a reinforcement layer formed in a triangular arrangement for the cutting wheel,
Fig. 4
a plan view of a reinforcement layer formed in a spiral for the cutting wheel,
Fig. 5
a further embodiment of a cutting wheel with a cast-in supporting body in cross section,
Fig. 6
5 shows a partial section from FIG. 5 on an enlarged scale,
Fig. 7
a partial cross section through a further embodiment of a cutting wheel and
Fig. 8
a partial section of Fig. 7 on an enlarged scale.

In Fig. 1 ist eine Schleifscheibe dargestellt, bei der es sich um eine Trenn-Schleifscheibe für eine handgeführte Schleifmaschine handelt. Sie weist einen ringzylinderförmigen Schleifring 1 auf, in den ein ebenfalls ringzylindrischer Tragkörper 2 eingeklebt ist. Der Schleifring 1 weist eine kreisringförmige Ausnehmung 3 auf, die konzentrisch zur Mittel-Längs-Achse 4 ausgebildet ist. In diese Ausnehmung 3 ist der Tragkörper 2 eingesetzt. Der Durchmesser der Ausnehmung 3, d.h. der Innendurchmesser Di des Schleifrings 1, ist um einige Zehntel Millimeter größer als der Außendurchmesser d des Tragkörpers 2. Der Schleifring 1 weist einen Außendurchmesser Da auf, wobei für das Verhältnis Da/Di gilt: 1,4 < Da/Di < 2, d.h. der Schleifring 1 weist eine bezogen auf seinen Außendurchmesser Da relativ große Ausnehmung 3 auf. Für Handtrennscheiben gilt 100 mm < Da < 300 mm. Für Schruppscheiben gilt insoweit 100 mm < Da < 230 mm.In Fig. 1, a grinding wheel is shown, which is a Cut-off wheel for a hand-held grinding machine. she has an annular cylindrical slip ring 1, in which also ring-cylindrical support body 2 is glued. The slip ring 1 has one circular recess 3, which is concentric to the central longitudinal axis 4 is formed. The support body 2 is inserted into this recess 3. The diameter of the recess 3, i.e. the inner diameter Di of the slip ring 1 is a few tenths of a millimeter larger than the outside diameter d of the support body 2. The slip ring 1 has an outer diameter Da on, where the relationship Da / Di applies: 1.4 <Da / Di <2, i.e. the slip ring 1 has one based on its Outside diameter Since relatively large recess 3. For hand cutting discs applies 100 mm <Da <300 mm. The same applies to grinding disks 100 mm <Da <230 mm.

Die Dicke a des Schleifrings 1 in Richtung der Achse 4 liegt im Bereich von 2,0 mm bis 4,0 mm und ist größer als die Dicke b des Tragkörpers 2 in Richtung der Achse 4, so daß der Schleifring 1 mit beiden Stirnseiten 5, 5' über die Stirnseiten 6, 6' des Tragkörpers 2 vorsteht. Grundsätzlich kann die Dicke des Tragkörpers 2 in Richtung der Achse 4 gleich der Dicke des Schleifrings 1 sein, wobei dann der Schleifring 1 und der Tragkörper 2 planparallel zueinander angeordnet sind; für Trennscheiben ist es aber von Vorteil, wenn die Dicke b des Tragkörpers 2 in Richtung der Achse 4 etwas geringer ist als die Dicke a des Schleifrings 1, um ein Eintauchen der Trenn-Schleifscheibe in ein zu durchtrennendes Werkstück zu ermöglichen bzw. zu erleichtern. Der Schleifring 1 und der Tragkörper 2 sind miteinander mittels eines geeigneten Klebstoffes, vorzugsweise Epoxid-Harz, verbunden. Um die Klebeverbindung zwischen Schleifring 1 und Tragkörper 2 möglichst fest zu machen, ist der aufgrund des Durchmesserunterschiedes von D und d gebildete Spalt 7 zwischen der zylindrischen Innenumfangsfläche 8 des Schleifrings 1 und der zylindrischen Außenumfangsfläche 9 des Tragkörpers 2 mit einer dünnen ringzylindrischen Klebstoffschicht 10 gefüllt. Weiterhin sind die aufgrund des axialen Überstandes des Schleifrings 1 gegenüber dem Tragkörper 2 gebildeten Zwickel 11 mit Klebstoffnähten 12 gefüllt, die einerseits an den freiliegenden Teilen der zylindrischen Innenumfangsfläche 8 und andererseits an den benachbarten Bereichen der Stirnseiten 6, 6' angreifen.The thickness a of the slip ring 1 in the direction of the axis 4 is in the range from 2.0 mm to 4.0 mm and is greater than the thickness b of the supporting body 2 in the direction of the axis 4, so that the slip ring 1 with both ends 5, 5 'protrudes over the end faces 6, 6' of the support body 2. Basically can the thickness of the support body 2 in the direction of the axis 4 equal to Thickness of the slip ring 1, wherein the slip ring 1 and Support body 2 are arranged plane-parallel to each other; for cutting discs but it is advantageous if the thickness b of the support body 2 in the direction the axis 4 is a little less than the thickness a of the slip ring 1 Immersion of the cutting wheel in a workpiece to be cut to enable or facilitate. The slip ring 1 and the support body 2 are preferably together using a suitable adhesive Epoxy resin. To the adhesive connection between slip ring 1 and to make the supporting body 2 as firm as possible is due to the difference in diameter gap D formed by D and d between the cylindrical Inner peripheral surface 8 of the slip ring 1 and the cylindrical Outer peripheral surface 9 of the support body 2 with a thin cylindrical ring Adhesive layer 10 filled. Furthermore, due to the axial Projection of the slip ring 1 relative to the support body 2 formed Gusset 11 filled with adhesive seams 12 on the one hand to the exposed Share the cylindrical inner peripheral surface 8 and on the other attack the adjacent areas of the end faces 6, 6 '.

Der Tragkörper 2 weist eine konzentrisch zur Achse 4 ausgebildete Aufnahmeöffnung 13 für die Antriebswelle einer handgeführten Schleifmaschine auf. Der Tragkörper 2 besteht aus Metall, und zwar üblicherweise aus Stahl. Er wird durch Stanzen oder Drehen aus Blech hergestellt. The support body 2 has a receiving opening formed concentrically to the axis 4 13 for the drive shaft of a hand-held grinding machine on. The support body 2 is made of metal, usually from steel. It is made from sheet metal by punching or turning.

Der Schleifring 1 hat - wie Fig. 2 erkennen läßt - den üblichen Grundaufbau, d.h. er weist im Bereich der Stirnseiten 5, 5' jeweils eine Armierungslage 14, 14' auf, die in noch zu beschreibender Weise ausgestaltet ist. Zwischen den Armierungslagen 14, 14' befinden sich Schleifkorn 15, bevorzugt aus Aluminiumoxid, Siliziumcarbid, Zirkonkorund, Solgel-Korn oder Gemischen hieraus und Bindemittel 16 in Form reiner oder modifizierter Kunstharze und Füllstoffe 17, wie z.B. Pyrit oder Kryolith. Das Schleifkorn 15 hat eine Nennkorngröße im Bereich von 315 bis 1000 µm.As can be seen in FIG. 2, the slip ring 1 has the usual basic structure, i.e. it has a reinforcement layer in the area of the end faces 5, 5 ' 14, 14 ', which is designed in a manner to be described is. Abrasive grain is located between the reinforcement layers 14, 14 ' 15, preferably made of aluminum oxide, silicon carbide, zirconium corundum, sol gel grain or mixtures thereof and binder 16 in the form of pure or modified Synthetic resins and fillers 17, e.g. Pyrite or cryolite. The Abrasive grain 15 has a nominal grain size in the range from 315 to 1000 µm.

Fig. 3 zeigt eine in der DE 38 19 199 C2 beschriebene Armierungslage 14 bzw. 14', die bevorzugt anstelle eines Gewebes bei derartigen Schleifringen 1, und zwar insbesondere bei Hand-Trenn-Schleifscheiben einzusetzen ist. Eine derartige Armierungslage 14 bzw. 14' ist aus einem oder mehreren Verstärkungsfäden 18 gebildet, die in optimaler Weise tangentialen und radialen Dehnungen des Schleifringes 1 entgegenwirken. Im Bereich einer mittleren Öffnung 19 verlaufen die Verstärkungsfäden 18 exakt tangential; sie verlaufen dann radial-tangential bis zum Außenumfang und sind dort umgelenkt und wiederum geradlinig zur Öffnung 19 zurückgeführt, wo sie tangential vorbeigeführt sind. Sie verlaufen damit im wesentlichen entsprechend der tatsächlichen Beanspruchung der rotierenden Schleifringe 1. Die größte Hauptspannung eines rotierenden Schleifrings verläuft in tangentialer Richtung. Die Tangential-Spannung, d.h. der Tangentialkraftverlauf, hat im Bereich der Öffnung 19, also radial innen im Bereich der Innenumfangsfläche 8 des Schleifringes 1, ihren höchsten Wert, der nach außen stetig abnimmt. Aus diesem Grunde ist es auch vertretbar, daß die Verstärkungsfäden 18 lediglich im Bereich der Öffnung 19 exakt tangential verlaufen, daß sie aber zwischen Öffnung 19 und Außenrand eine radiale Komponente erhalten, um der in diesem Bereich ebenfalls starken Radialspannung entgegenzuwirken. Die Verstärkungsfäden 18 sind an den jeweiligen Kreuzungsstellen 20 miteinander verbunden, und zwar durch ein Kunstharz. Die Verstärkungsfäden 18 werden vor dem Legen zu dem in Fig. 3 dargestellten Muster mit einer Kunstharzlösung getränkt. Nach dem Legen werden die Verstärkungsfäden 18 heiß verpreßt, wodurch dieses Kunstharz anhärtet, so daß eine Verbindung der Verstärkungsfäden 18 an den Kreuzungsstellen 20 eintritt. Die Armierungslage 14 bzw. 14' ist damit ausreichend eigenstabil, um zur Herstellung eines Schleifrings 1 eingesetzt zu werden. Mit Ausnahme im Bereich der äußeren Umlenkstellen 21 und der inneren Umlenkung im Bereich der Öffnung 19 verlaufen die Verstärkungsfäden 18 geradlinig. Der Innendurchmesser D'i der Armierungslage 14 bzw. 14' entspricht im wesentlichen dem Innendurchmesser Di des Schleifrings 1. Entsprechendes gilt für das Verhältnis des Außendurchmessers D'a der Armierungslage 14 bzw. 14' im Verhältnis zum Durchmesser Da des Schleifrings 1. Die Scheitelwinkel c der Verstärkungsfäden 18 im Bereich der Umlenkstellen 21 richten sich, wenn der nicht dargestellte Krümmungsradius im Bereich der Umlenkstellen 21 vernachlässigt wird, ausschließlich nach dem Verhältnis von D'a zu D'i. Da die Verstärkungsfäden 18 im wesentlichen wie die Schenkel eines gleichschenkligen Dreiecks angeordnet sind, spricht man auch von einer Dreiecks-Legung.3 shows a reinforcement layer 14 described in DE 38 19 199 C2 or 14 ', which is preferred instead of a fabric in such slip rings 1, in particular to use with hand-cut grinding wheels is. Such a reinforcement layer 14 or 14 'is made of one or a plurality of reinforcing threads 18 are formed, which are optimally tangential and counteract radial expansion of the slip ring 1. in the The reinforcing threads 18 run in the area of a central opening 19 exactly tangential; they then run radially tangentially to the outer circumference and are redirected there and again straight to the opening 19 returned to where they passed tangentially. You run with it essentially according to the actual stress on the rotating Slip rings 1. The greatest principal tension of a rotating The slip ring runs in the tangential direction. The tangential tension, i.e. the tangential force curve has in the area of the opening 19, that is radially inside in the area of the inner peripheral surface 8 of the slip ring 1, their highest value, which steadily decreases towards the outside. For this reason it is also justifiable that the reinforcing threads 18 only in the area the opening 19 are exactly tangential, but that they are between the opening 19 and outer edge received a radial component to the in this Counteract also strong radial tension in the area. The reinforcement threads 18 are at the respective crossing points 20 with each other connected, namely by a synthetic resin. The reinforcing threads 18 are before laying to the pattern shown in Fig. 3 with a Soaked synthetic resin solution. After laying, the reinforcement threads 18 hot pressed, causing this resin to harden, so that a connection the reinforcing threads 18 occurs at the crossing points 20. The Reinforcement layer 14 or 14 'is therefore sufficiently inherently stable to Production of a slip ring 1 to be used. With the exception of Area of the outer deflection points 21 and the inner deflection in the The reinforcement threads 18 run in a straight line in the region of the opening 19. The inside diameter D'i of the reinforcement layer 14 or 14 'corresponds to essentially the inner diameter Di of the slip ring 1. Corresponding applies to the ratio of the outer diameter D'a of the reinforcement layer 14 or 14 'in relation to the diameter Da of the slip ring 1. Die Vertex angle c of the reinforcing threads 18 in the region of the deflection points 21 align when the radius of curvature, not shown, in the range of Deflection points 21 is neglected, only according to the ratio from D'a to D'i. Since the reinforcing threads 18 are essentially like that Legs of an isosceles triangle are arranged also from a triangle.

In Fig. 4 ist eine Armierungslage 14 bzw. 14' dargestellt, die ganz besonders bevorzugt anstelle eines Gewebes bei den geschilderten Schleifringen 1 von Trenn-Schleifscheiben für handgeführte Schleifmaschinen einzusetzen sind. Bei dieser Ausgestaltung sind die Verstärkungsfäden 18 jeweils von der mittleren Öffnung 19 aus entsprechend der Resultierenden der Hauptspannungsrichtung gelegt. In Fig. 4 ist der Verlauf eines solchen Verstärkungsfadens in verstärkter Linienführung dargestellt. Er beginnt - bei spiegelsymmetrischer Ausgestaltung - tangential im Bereich der Öffnung 19 und ist in etwas mehr als einer Halb-Spiraldrehung derart zur äußeren Umlenkstelle 21 geführt, daß er dort bereits wieder einen annähernd tangentialen Verlauf hat. Wie Fig. 4 entnehmbar ist, liegt ein Verstärkungsfaden 18 angenähert nur punktförmig an der mittleren Öffnung 19 an. Daraus folgt, daß keine übermäßige Anhäufung von Material der Verstärkungsfäden 18 im Bereich der Öffnung 19 auftritt. Diese Tatsache und der geschilderte Verlauf der Verstärkungsfäden lassen diese Armierungslage 14 bzw. 14' noch vorteilhafter erscheinen als die Armierungslage nach Fig. 3.In Fig. 4, a reinforcement layer 14 or 14 'is shown, which is very special preferably instead of a fabric in the slip rings described 1 of cut-off wheels for hand-held grinding machines are. In this embodiment, the reinforcing threads 18 in each case from the central opening 19 in accordance with the resultant the main stress direction. 4 is the course of such Reinforcement thread shown in reinforced lines. He begins - with mirror-symmetrical design - tangential in the area opening 19 and is such in slightly more than a half-spiral rotation led to the outer deflection point 21 that he already there again has an approximately tangential course. As can be seen in FIG. 4, Reinforcing thread 18 approximates only point-wise at the central opening 19 on. It follows that there is no excessive accumulation of material the reinforcing threads 18 occurs in the region of the opening 19. this fact and the described course of the reinforcing threads leave them Reinforcement layer 14 or 14 'appear even more advantageous than the reinforcement layer 3.

Bei der Ausgestaltung einer Schleifscheibe nach den Fig. 5 und 6 ist der Schleifring 1 in gleicher Weise ausgestaltet wie bei dem Ausführungsbeispiel nach den Fig. 1 und 2. Der Tragkörper 2' ist ebenfalls scheibenförmig ausgebildet wie in Fig. 1 dargestellt, wobei für die Dicken a und b die obigen Ausführungen gelten. Er besteht aus Zinkdruckguß und ist durch Einspritzen in die Ausnehmung 3 des Schleifrings 1 hergestellt. In the design of a grinding wheel according to FIGS. 5 and 6 is the Slip ring 1 designed in the same way as in the embodiment 1 and 2. The support body 2 'is also disc-shaped formed as shown in Fig. 1, wherein for the thicknesses a and b the above statements apply. It is made of die-cast zinc and is produced by injection into the recess 3 of the slip ring 1.

Hierbei dringt das Zink entsprechend der vergrößerten Detaildarstellung in Fig. 6 im Bereich der Ausnehmung 3 in Hohlräume 22 zwischen dem Schleifkorn 15 bzw. Bindemittel 16 und Füllstoffen 17 ein, wodurch eine hochfeste formschlüssige Verbindung zwischen Tragkörper 2' und Schleifring 1 bewirkt wird.Here, the zinc penetrates according to the enlarged detail 6 in the region of the recess 3 in cavities 22 between the Abrasive grit 15 or binder 16 and fillers 17, thereby a high-strength positive connection between support body 2 'and slip ring 1 is effected.

Nachfolgend wird die Herstellung einer Schleifscheibe anhand dreier Beispiele erläutert:The following is the production of a grinding wheel based on three examples explains:

Beispiel I:Example I:

Es wird eine Armierungslage 14' in eine Preß-Form eingelegt. Anschliessend wird ein aus Schleifkorn 15, Füllstoff 17 und Bindemittel 16 bestehendes Schleifgranulat in die Form eingegeben und eine weitere Armierungslage 14 aufgelegt. Auf dieses Paket wird dann ein Druck von 500 bis 4000 N/cm2 ausgeübt, wodurch der Schleifring 1 verdichtet wird. Bei diesem Verdichten tritt eine Klebeverbindung ein, die als Grünfestigkeit bezeichnet wird. Bei diesem Verpressen drückt sich das Schleifgranulat, also Schleifkorn 15, Bindemittel 16 und Füllstoff 17 jeweils durch die Armierungslage 14 bzw. 14' nach außen durch.A reinforcement layer 14 'is placed in a press mold. Subsequently, an abrasive granulate consisting of abrasive grain 15, filler 17 and binder 16 is introduced into the mold and another reinforcement layer 14 is placed on it. A pressure of 500 to 4000 N / cm 2 is then exerted on this package, as a result of which the slip ring 1 is compressed. During this compression, an adhesive bond occurs, which is referred to as green strength. During this pressing, the abrasive granules, ie abrasive grain 15, binding agent 16 and filler 17, each press outward through the reinforcing layer 14 or 14 '.

Diese verdichteten aber noch nicht ausgehärteten Schleifringe werden zwischen Stahlplatten gestapelt und zum Aushärten in einen Ofen gegeben, wo sie je nach gewünschtem Härtegrad Temperaturen von 120°C bis 200°C ausgesetzt werden.These compressed but not yet hardened slip rings are between Steel plates stacked and placed in an oven for hardening where depending on the desired degree of hardness, they are exposed to temperatures of 120 ° C to 200 ° C will.

In diese fertigen ausgehärteten Schleifringe 1 wird jeweils ein Tragkörper 2 in der bereits geschilderten Weise eingeklebt. Der die Klebstoffschicht 10 und die Klebstoffnähte 12 bildende Klebstoff wird anschließend in einem Durchlaufofen bei etwa 120°C ausgehärtet.In this finished hardened slip rings 1 is a support body 2 glued in the manner already described. The the adhesive layer 10 and the adhesive seams 12 forming adhesive is then in cured in a continuous furnace at about 120 ° C.

Beispiel II:Example II:

Das Herstellen des Schleifrings 1 bis zur Verdichtung erfolgt wie beim Beispiel I. Anschließend wird vor dem Aushärten des Schleifrings 1 der Tragkörper 2 in der geschilderten Weise eingeklebt. Die aus Schleifring 1 und Tragkörper 2 bestehende Schleifscheibe wird dann zwischen Stahlplatten gestapelt und zum Aushärten wie beim Beispiel I in einen Ofen gegeben, wobei jetzt gleichzeitig das Bindemittel 16 des Schleifrings 1 und der Klebstoff der Klebstoffschicht 10 und der Klebstoffnähte 12 bei Temperaturen zwischen 120°C und 200°C - je nach gewünschtem Härtegrad - ausgehärtet werden.The production of the slip ring 1 up to the compression takes place as for Example I. Then before the hardening of the slip ring 1 Support body 2 glued in the manner described. The slip ring 1 and support body 2 existing grinding wheel is then between steel plates stacked and placed in an oven for curing as in Example I, now simultaneously the binder 16 of the slip ring 1 and the adhesive of the adhesive layer 10 and the adhesive seams 12 at temperatures between 120 ° C and 200 ° C - depending on the desired degree of hardness - be cured.

Beispiel III:Example III

Das Herstellen des Schleifrings 1 erfolgt wie beim Beispiel I. Anschließend wird dieser Schleifring 1 in eine Spritzgußform einer Zink-Spritzgießmaschine eingelegt und der Tragkörper 2' durch Einspritzen hergestellt. Wegen der hohen Abkühlgeschwindigkeit des Zinks erfolgt keine thermisch bedingte Schädigung des Schleifrings 1 und insbesondere des Bindemittels 16.The slip ring 1 is produced as in Example I. Then this slip ring 1 is in an injection mold of a zinc injection molding machine inserted and the support body 2 'produced by injection. Because of the high cooling rate of the zinc does not occur thermally conditional damage to the slip ring 1 and in particular the binder 16.

Anstelle äußerer, d.h. im Bereich der Stirnseiten 5, 5', liegender Armierungslagen 14, 14' kann der Schleifring 1 auch in bekannter Weise eine innenliegende Armierungslage aufweisen.Instead of external, i.e. reinforcement layers lying in the area of the end faces 5, 5 ' 14, 14 ', the slip ring 1 can also be in a known manner have internal reinforcement layer.

Die Schleifscheibe kann bis zur vollständigen Abarbeitung des Schleifrings 1 eingesetzt werden, und zwar insbesondere auch beim Einsatz als Trenn-Schleifscheibe, da sie in einen durch Trennschleifen am Werkstück erzeugten Spalt eintauchen kann, ohne daß Kollisionen zwischen dem Tragkörper 2 und dem bearbeiteten Werkstück auftreten können.The grinding wheel can be used until the grinding ring has been completely processed 1 are used, especially when used as a cutting wheel, because they are created in a cut-off on the workpiece Gap can dip without collisions between the support body 2 and the machined workpiece can occur.

Reste des Schleifrings 1 und der Klebstoffschicht 10 und der Klebstoffnähte 12 können durch Erwärmen des übriggebliebenen Tragkörpers 2 und durch anschließendes Abbürsten mittels Stahlbürsten entfernt werden. Die Tragkörper 2 können dann wieder verwendet werden. Sollten sie beschädigt sein, so können sie in einfacher Weise recycelt werden.Remains of the slip ring 1 and the adhesive layer 10 and the adhesive seams 12 can by heating the remaining support body 2 and can be removed by subsequent brushing with steel brushes. The Support body 2 can then be used again. Should they be damaged they can be easily recycled.

Bei der Schleifscheibe mit eingespritztem Tragkörper 2' aus Zinkdruckguß erfolgt das Trennen von Resten des Schleifrings 1 und Tragkörpers 2' durch Erhitzen des Zinks auf Schmelztemperatur.For the grinding wheel with injected support body 2 'made of die-cast zinc remains of the slip ring 1 and support body 2 'are separated by heating the zinc to the melting temperature.

Fig. 7 und 8 zeigen eine Hand-Trenn-Schleifscheibe, die einerseits einen Schleifring 1 und andererseits einen Tragkörper 2'' aufweist. Der Schleifring entspricht in seinem Aufbau im wesentlichen dem oben geschilderten Aufbau, wobei er mit Armierungslagen 14, 14' versehen ist, wie sie in Fig. 4 dargestellt und vorstehend hierzu beschrieben sind.7 and 8 show a hand-cutting wheel, the one hand Slip ring 1 and on the other hand has a support body 2 ''. The slip ring Its structure corresponds essentially to that described above Structure, wherein it is provided with reinforcing layers 14, 14 ', as in 4 and are described above for this purpose.

Der Tragkörper 2'' besteht aus relativ dünnem Blech aus Stahl, gegebenenfalls rostfreiem Stahl, Aluminium oder Messing, für dessen Dicke e gilt 0,4 mm ≤ e ≤ 1,0 mm, wobei für praxisnahe Fälle gilt 0,5 mm ≤ e ≤ 0,8 mm.The support body 2 '' consists of a relatively thin sheet of steel, if necessary stainless steel, aluminum or brass, whose thickness e applies 0.4 mm ≤ e ≤ 1.0 mm, whereby applies to practical cases 0.5 mm ≤ e ≤ 0.8 mm.

Um die Aufnahmeöffnung 13 herum sind sich radial zur Achse 4 erstreckende Rippen 23 ausgebildet, die lediglich den Zweck haben, die Einspannung des Tragkörpers 2'' auf den üblichen Aufnahmen der Spindeln von handgeführten Schleifmaschinen zu ermöglichen.Around the receiving opening 13 are radially extending to the axis 4 Ribs 23 formed, which have only the purpose that Clamping the support body 2 '' on the usual recordings of the spindles of hand-held grinding machines.

Am Außenrand ist der sehr dünne Tragkörper 2'' zu einem ringzylindrischen Rand 24 umgebördelt, dessen Erstreckung b in Richtung der Achse 4 gleich oder etwas kleiner ist als die Dicke a des Schleifrings 1. Auf dem ringzylindrischen Rand 24 ist eine Außenumfangsfläche 9'' ausgebildet, die mit dem Schleifring 1 verbunden ist. Der Schleifring 1 ist unmittelbar an der Außenumfangsfläche 9'' des ringzylindrischen Randes 24 angebracht, was bei der nachfolgenden Beschreibung der Herstellung noch weiter erläutert wird. Die Trenn-Schleifscheibe, wie sie in den Fig. 7 und 8 dargestellt ist, ist gegen Seitenkräfte, d.h. gegen Kräfte, die am Schleifring 1 mit radialem Abstand zum Tragkörper 2'' parallel zur Achse 4 angreifen, so elastisch, daß ein Brechen der Schleifscheibe, und zwar insbesondere im Bereich des Randes 24 nicht eintreten kann. Der Tragkörper 2'' selber ist also auch parallel zur Achse 4 biegeelastisch. Die gesamte Schleifscheibe ist als Verbundkörper biegeelastisch, d.h. bei Seitenbiegekräften treten keine Sprungstellen im Biegespannungsverlauf im Bereich des Randes 24 auf, so daß die Biegebruchgefahr aufgrund von parallel zur Achse 4 wirkenden Seitenkräften nicht gegeben ist. Andererseits ist auch der Schleifring 1 für derartige Kräfte biegeelastisch, was einerseits auf die Kunstharzbindung des Schleifringes 1 und andererseits auf das Vorhandensein der Armierungslagen 14, 14' zurückzuführen ist. Aus den vorgenannten Gründen muß die Dicke e des Tragkörpers 2'' gering sein; andererseits ist der Rand 24 notwendig, damit die Außenumfangsfläche 9'' eine ausreichend axiale Erstreckung b hat, um die vom Schleifring 1 her auf den Tragkörper 2'' zu übertragenden Torsionskräfte und auch die erwähnten Seitenbiegekräfte vom Schleifring 1 auf den Tragkörper 2'' übertragen zu können. Die Dicke a des Schleifrings 1 von Trenn-Schleifscheiben ist im Bereich von 2 bis 4 mm. Daraus ergibt sich, daß die Dicke e des Tragkörpers 2'' erheblich geringer ist als die Dicke a des Schleifrings 1. Es gilt 0,1 a ≤ e ≤ 0,25a. Für die axiale Erstreckung b des Randes 24 gilt, daß sie nur unwesentlich kleiner sein sollte, als die Dicke a. Hier gilt 0,8 a ≤ b ≤ 1,0 a.On the outer edge, the very thin support body 2 '' is a ring-cylindrical Edge 24 flanged, its extension b in the direction of axis 4 is equal to or slightly less than the thickness a of the slip ring 1. On the annular cylindrical edge 24 is formed an outer peripheral surface 9 '' is connected to the slip ring 1. The slip ring 1 is immediately on the outer peripheral surface 9 ″ of the ring-cylindrical edge 24, which is further explained in the following description of the manufacture becomes. The cutting grinding wheel, as shown in FIGS. 7 and 8 is against lateral forces, i.e. against forces acting on the slip ring 1 engage at a radial distance from the support body 2 '' parallel to the axis 4, so elastic that the grinding wheel breaks, in particular cannot occur in the area of the edge 24. The supporting body 2 '' itself is also flexible in parallel to axis 4. The whole As a composite, the grinding wheel is flexible, i.e. with lateral bending forces there are no jumps in the bending stress curve in the area of the edge 24, so that the risk of bending due to parallel lateral forces acting on axis 4 are not given. On the other hand also the slip ring 1 is flexible for such forces, which on the one hand on the synthetic resin bond of the slip ring 1 and on the other hand on the The presence of the reinforcement layers 14, 14 'can be traced back. From the the aforementioned reasons, the thickness e of the support body 2 '' must be small; on the other hand, the edge 24 is necessary so that the outer peripheral surface 9 '' has a sufficient axial extent b around that from the slip ring 1 on the support body 2 '' to be transmitted torsional forces and also those mentioned Transfer side bending forces from slip ring 1 to support body 2 '' to be able to. The thickness a of the slip ring 1 of cutting grinding wheels is in the range of 2 to 4 mm. It follows that the Thickness e of the supporting body 2 ″ is considerably less than the thickness a of the Slip ring 1. The following applies: 0.1 a ≤ e ≤ 0.25a. For the axial extension b of margin 24 applies that it should be only slightly smaller than that Thickness a. Here 0.8 a ≤ b ≤ 1.0 a applies.

Auch bei dieser Trenn-Schleifscheibe gilt für das Verhältnis Da/Di ≤ 2 und insbesondere gilt 1,4 ≤ Da/Di ≤ 2. Die spezielle Spirallegung nach Fig. 4 ermöglicht es, die Ausnehmung 3 des Schleifrings 1 relativ zum Außendurchmesser Da sehr groß zu machen, was wieder dazu führt, daß der Schleifring 1 beim Trennschleifen vollständig aufgebraucht werden kann, und zwar so weit, daß am Rand 24 keinerlei Reste des Schleifrings 1 mehr vorhanden bleiben. Dies liegt mit daran, daß bis zum Ende des Schleifeinsatzes im Schleifring 1 eine Armierung vorhanden ist, deren Verstärkungsfäden 18 in diesem Bereich rein tangential verlaufen und daher in besonders günstiger Weise die hier auftretenden hohen Tangentialkräfte aufnehmen können. Damit die feste Verbindung zwischen Tragkörper 2'' und Schleifring 1 an der Außenumfangsfläche 9'' nicht negativ beeinträchtigt wird, sollte der Tragkörper 2'' einer Oberflächenbehandlung unterworfen worden sein, die einer Oberflächenoxidation, insbesondere Rostbildung bei nicht-rostfreiem Stahl, entgegenwirkt. Hierfür kommt ein Vernickeln oder Verkupfern des Tragkörpers 2'' in Betracht, insbesondere aber auch eine Plasmapolymer-Behandlung des Tragkörpers 2'', da durch eine derartige Behandlung einerseits eine extreme Reinigung stattfindet und andererseits eine besonders hohe Klebefähigkeit erreicht wird, was für die Außenumfangsfläche 9'' besonders günstig ist.The ratio Da / Di ≤ 2 also applies to this cutting wheel and in particular applies 1.4 ≤ Da / Di ≤ 2. The special spiral laying according to Fig. 4 allows the recess 3 of the slip ring 1 relative to Outside diameter Da to make very large, which again leads to the fact that the slip ring 1 are completely used up during cut-off grinding can, so far that at the edge 24 no residues of the slip ring 1 more remain. This is due to the fact that by the end of the Grinding insert in the slip ring 1 is a reinforcement, the Reinforcement threads 18 run in this area purely tangential and therefore the high tangential forces occurring here in a particularly favorable manner be able to record. So that the fixed connection between the supporting body 2 '' and slip ring 1 on the outer peripheral surface 9 '' are not negative is impaired, the support body 2 '' should undergo a surface treatment have been subjected to surface oxidation, in particular Rust formation in non-stainless steel, counteracts. For this comes one Nickel plating or copper plating of the support body 2 ″ into consideration, in particular but also a plasma polymer treatment of the support body 2 ″, because of such treatment, on the one hand, an extreme cleaning takes place and on the other hand a particularly high adhesiveness is achieved, which is particularly favorable for the outer peripheral surface 9 ''.

Nachfolgend wird beispielhaft die Herstellung der Trenn-Schleifscheibe nach den Fig. 7 und 8 erläutert:The production of the cutting wheel is shown below as an example 7 and 8 explained:

Beispiel IV:Example IV:

Die Außenumfangsfläche 9'' wird mit einer dünnen Schicht 25 aus elastifiziertem Phenol-Formaldehyd-Klebstoff versehen, die die Funktion eines Haftvermittlers hat und nicht zwingend notwendig ist. Dann wird der Tragkörper 2'' in eine Preßform eingelegt, wobei er mit seiner dem Rand 24 abgewandten Stirnseite 6'' auf den Boden der Preßform aufgelegt wird, d.h. der Rand 24 steht hoch. Dann wird eine Armierungslage 14' eingelegt, deren Öffnung 19 von dem Tragkörper 2'' vollständig ausgefüllt wird. Dann wird Schleifgranulat in die Preßform eingefüllt und eingekämmt oder eingerakelt. Dieses Schleifgranulat besteht aus dem bereits geschilderten Schleifkorn 15 mit einer Nenn-Korngröße im Bereich von 600 µm, Bindemittel 16 und Füllstoff 17, wobei das Bindemittel ebenfalls ein Phenol-Formaldehyd-Klebstoff ist, der in der Regel identisch mit dem ist, aus dem die Schicht 25 besteht. Auf jeden Fall sollte es ein aushärtender Polykondensations-Klebstoff sein. Auf die eingekämmte oder eingerakelte Schicht des Schleifgranulats wird die zweite Armierungslage 14 aufgelegt. Anschließend erfolgt ein Verpressen des Schleifgranulats mit dem Tragkörper 2'' unter einem Druck von 500 bis 4000 N/cm2. Bei diesem Preßvorgang drückt sich Schleifkorn 15 zum einen in die Schicht 25 und zum anderen auch in die Außenumfangsfläche 9'' des Randes 24, wodurch eine besonders feste verzahnungsartige Verbindung zwischen dem Schleifring 1 und dem Tragkörper 2'' erreicht wird. Diese verdichteten aber noch nicht ausgehärteten Schleifscheiben werden zwischen Stahlplatten gestapelt und zum Aushärten in einen Ofen gegeben und je nach angestrebtem Härtegrad bei Temperaturen zwischen 120 und 200°C ausgehärtet. Das Herstellen der Verbindung zwischen Schleifring 1 und Tragkörper 2'' einerseits und das Aushärten des Schleifgranulats andererseits erfolgt also in einem Arbeitsgang.The outer peripheral surface 9 ″ is provided with a thin layer 25 of elasticized phenol-formaldehyde adhesive, which has the function of an adhesion promoter and is not absolutely necessary. Then the support body 2 ″ is placed in a mold, with its end face 6 ″ facing away from the edge 24 being placed on the bottom of the mold, ie the edge 24 stands up. Then a reinforcement layer 14 'is inserted, the opening 19 of which is completely filled by the supporting body 2''. Then grinding granulate is filled into the mold and combed or knife. This grinding granulate consists of the abrasive grain 15 already described with a nominal grain size in the range of 600 microns, binder 16 and filler 17, the binder also being a phenol-formaldehyde adhesive, which is generally identical to that from which the Layer 25 exists. In any case, it should be a curing polycondensation adhesive. The second reinforcement layer 14 is placed on the combed or scraped-in layer of the grinding granulate. The grinding granulate is then pressed with the supporting body 2 ″ under a pressure of 500 to 4000 N / cm 2 . During this pressing process, abrasive grain 15 presses into the layer 25 on the one hand and also into the outer peripheral surface 9 ″ of the edge 24, as a result of which a particularly firm tooth-like connection between the slip ring 1 and the support body 2 ″ is achieved. These compacted but not yet hardened grinding wheels are stacked between steel plates and placed in an oven for hardening and hardened at temperatures between 120 and 200 ° C, depending on the desired degree of hardness. The connection between the slip ring 1 and the support body 2 ″ on the one hand and the hardening of the grinding granulate on the other hand is thus carried out in one operation.

Für die Auswahl des Bindemittels 16 gilt, daß der Schleifring 1 selber ein möglichst hartes Bindemittel 16 aufweisen soll, um einerseits ein Schmieren beim Schleifvorgang zu verhindern und um andererseits ein frühzeitiges Ausbrechen des Schleifkorns 15 sicherzustellen, damit eine Selbstschärfung der Schleifscheibe erreicht wird. Andererseits darf das Bindemittel nicht so hart bzw. spröde sein, daß ein Abbrechen des Schleifrings 1 vom Tragkörper 2'' eintreten kann. Polykondensations-Klebstoffe mit zahlreichen Modifikationsmöglichkeiten haben sich hier als besonders vorteilhaft erwiesen. For the selection of the binder 16 applies that the slip ring 1 itself should have as hard a binder 16 as possible, on the one hand To prevent lubrication during the grinding process and on the other hand ensure premature breakout of the abrasive grain 15 so that a Self-sharpening of the grinding wheel is achieved. On the other hand, it can Binder should not be so hard or brittle that breaking off the Slip ring 1 from the support body 2 '' can occur. Polycondensation adhesives with numerous modification options have here as proven particularly advantageous.

Wie Fig. 8 entnehmbar ist und wie sich aus der vorstehend geschilderten Herstellungsart ergibt, ist die Stirnseite 5' des Schleifrings 1 bündig mit der Stirnseite 6'', während die Stirnseite 5 des Schleifrings 1 in Richtung der Achse 4 etwas über den Rand 24 vorsteht.As can be seen in FIG. 8 and as can be seen from the above Production type results, the end face 5 'of the slip ring 1 is flush with the end face 6 '', while the end face 5 of the slip ring 1 in the direction the axis 4 protrudes slightly beyond the edge 24.

Claims (16)

  1. An abrasive wheel for hand-guided grinding machines, in particular an abrasive cutting-off wheel, comprising an inner support (2, 2'') and an abrasive ring (1) connected with the latter and having a synthetic resin bonding of the abrasive grit (15), the annular-disk-type abrasive ring (1) having a recess (3) formed concentrically of a central longitudinal axis (4) and in which the annular-disk-type support (2, 2'') is arranged and connected with the abrasive ring (1),
    characterized
    in that the abrasive ring (1) has at least one reinforcement layer (14, 14'),
    in that the support (2, 2'') consists of metal sheet,
    in that the thickness (e) of the support (2'') is distinctly less than the thickness (a) of the abrasive ring (1), and
    in that, at its outer circumference, the support (2'') is provided with a substantially annular cylindrical rim (24), of which the length (b) in the direction of the central longitudinal axis (4) is greater than the thickness (e) of the support (2'') and to the outer circumferential surface (9'') of which the abrasive ring (1) is secured.
  2. An abrasive wheel according to claim 1, characterized
    in that 1.4 ≤ Da/Di ≤ 2 applies to the ratio which the outside diameter (Da) bears to the inside diameter (Di) of the abrasive ring (1).
  3. An abrasive wheel according to claim 1 or 2, characterized in that the support (2, 2'') is glued in the recess (3) of the abrasive ring (1).
  4. An abrasive wheel according to claim 1, characterized
    in that the support (2'') has a thickness (e) of 0.4 mm ≤ e ≤ 1.0 mm and preferably 0.5 mm ≤ e ≤ 0.8 mm.
  5. An abrasive wheel according to one of claims 1 to 4, characterized
    in that 0.8 a ≤ b ≤ 1.0 a applies to the axial length (b) of the rim (24) as compared to the thickness (a) of the abrasive ring (1).
  6. An abrasive wheel according to one of claims 1 to 5, characterized
    in that the support (2'') is provided with ribs (23) around a receiving aperture (13) formed concentrically of its central longitudinal axis (4).
  7. An abrasive wheel according to one of claims 1 to 6, characterized
    in that the abrasive ring (1), by at least one front face (5), projects from a front face (6) of the support (2, 2'').
  8. An abrasive wheel according to one of claims 1 to 7, characterized
    in that the inner circumferential surface (8), defining the recess (3), of the abrasive ring (1) and/or the outer circumferential surface (9, 9'') of the support (2, 2'') are cylindrical.
  9. An abrasive wheel according to one of claims 1 to 8, characterized
    in that the reinforcement layer (14, 14') comprises reinforcing threads (18) extending tangentially in the vicinity of a central opening (19) and radially tangentially towards the outer circumference and which are deflected at the outer circumference.
  10. An abrasive wheel according to claim 9, characterized
    in that the reinforcing threads (18) extend tangentially and radially tangentially in a straight line.
  11. An abrasive wheel according to claim 9, characterized
    in that the reinforcing threads (18) partially spiral from the central opening (19) towards the outer circumference.
  12. An abrasive wheel according to one of claims 9 to 11, characterized
    in that the reinforcement threads (18) are glued together at their intersections (20).
  13. An abrasive wheel according to claim 1, characterized
    in that the abrasive grit (15) is partially forced into the outer circumferential surface (9'') of the rim (24).
  14. An abrasive wheel according to one of claims 1 to 13, characterized
    in that the abrasive ring (1) has a polycondensation adhesive as a bonding agent (16).
  15. An abrasive wheel according to one of claims 1 to 14, characterized
    in that the outer circumferential surface (9'') of the rim (24) is provided with a layer (25) of glue of the same kind as the bonding agent (16) of the abrasive ring (1).
  16. An abrasive wheel according to one of claims 1 to 15, characterized
    in that 0.1 a ≤ e ≤ 0.25 a applies to the thickness (e) of the support (2'') in relation to the thickness (a) of the abrasive ring (1).
EP94100690A 1993-02-15 1994-01-19 Abrasive disc for power grinder, especially cutting-off disc Expired - Lifetime EP0612586B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97121891A EP0832720A3 (en) 1993-02-15 1994-01-19 Grinding disc for hand-held grinding machine, especially cutting disc

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4304513 1993-02-15
DE4304513 1993-02-15
DE4311529 1993-04-07
DE4311529A DE4311529A1 (en) 1993-02-15 1993-04-07 Grinding wheel for hand-held grinding machines, in particular cutting wheel

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP97121891A Division EP0832720A3 (en) 1993-02-15 1994-01-19 Grinding disc for hand-held grinding machine, especially cutting disc

Publications (2)

Publication Number Publication Date
EP0612586A1 EP0612586A1 (en) 1994-08-31
EP0612586B1 true EP0612586B1 (en) 1998-12-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP94100690A Expired - Lifetime EP0612586B1 (en) 1993-02-15 1994-01-19 Abrasive disc for power grinder, especially cutting-off disc

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US (1) US5584755A (en)
EP (1) EP0612586B1 (en)
AT (1) ATE174544T1 (en)
CA (1) CA2114582A1 (en)
ES (1) ES2127298T3 (en)

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DE4338492A1 (en) * 1993-11-11 1995-05-18 Rueggeberg August Cutting-off wheel for stationary grinding machines and their use
EP0909612B1 (en) * 1997-10-16 2002-06-19 August Rüggeberg GmbH &amp; Co. Grinding disc
DE19826919A1 (en) * 1998-06-17 1999-12-23 Hilti Ag Tool for processing hard surfaces
JP2002127020A (en) * 2000-10-26 2002-05-08 Noritake Co Ltd Method for regenerating grinding wheel
JP2003039331A (en) 2001-08-01 2003-02-13 Noritake Co Ltd Grinding wheel having resin core part, manufacturing method thereof, and recycling method thereof
AT502285B1 (en) * 2004-10-19 2008-12-15 Gissing Gerhard CIRCUIT RING WITH DOUBLE BOLTING DEVICE
US20070023026A1 (en) * 2005-07-28 2007-02-01 Broyles Michelle Dicing blade
JP2010052081A (en) * 2008-08-27 2010-03-11 Fuji Grinding Wheel Mfg Co Ltd Method for manufacturing rotary grinding wheel, and rotary grinding wheel manufactured by the same
US20100319513A1 (en) * 2009-06-21 2010-12-23 Yu-Chang Hsu Combined splitting blade
US9138869B2 (en) * 2012-08-28 2015-09-22 Saint-Gobain Abrasives, Inc. Large diameter cutting tool
JP5893669B2 (en) * 2014-04-30 2016-03-23 富士製砥株式会社 Rotating whetstone manufacturing method and rotating whetstone manufactured by the manufacturing method

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US5584755A (en) 1996-12-17
ES2127298T3 (en) 1999-04-16
EP0612586A1 (en) 1994-08-31
ATE174544T1 (en) 1999-01-15
CA2114582A1 (en) 1994-08-16

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