EP0657251B1 - Cutting-off grinding disc for stationary grinding machine and use of same - Google Patents

Cutting-off grinding disc for stationary grinding machine and use of same Download PDF

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Publication number
EP0657251B1
EP0657251B1 EP94115358A EP94115358A EP0657251B1 EP 0657251 B1 EP0657251 B1 EP 0657251B1 EP 94115358 A EP94115358 A EP 94115358A EP 94115358 A EP94115358 A EP 94115358A EP 0657251 B1 EP0657251 B1 EP 0657251B1
Authority
EP
European Patent Office
Prior art keywords
abrasive
wheel according
ring
support
grinding
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
EP94115358A
Other languages
German (de)
French (fr)
Other versions
EP0657251A1 (en
Inventor
Dr. Diethard Sinram
Dipl.-Ing. Theodor Schneider
Dr. Dipl.-Ing. Bernd Stuckenholz
Dipl.-Ing. Peter Alfer
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
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Filing date
Publication date
Application filed by August Rueggeberg GmbH and Co KG filed Critical August Rueggeberg GmbH and Co KG
Publication of EP0657251A1 publication Critical patent/EP0657251A1/en
Application granted granted Critical
Publication of EP0657251B1 publication Critical patent/EP0657251B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone
    • B28D1/121—Circular saw blades
    • 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
    • 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

Definitions

  • the invention relates to a cutting wheel for stationary Grinding machines and their use.
  • 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 lies in the fact that the Grinding disks clamped on the grinding spindles with the help of flanges that are spread over a substantial portion of the diameter extend the grinding wheel, as well as in that the diameter of the goods to be separated impossible to use the cutting disc again makes.
  • Cut-off wheels for stationary grinding machines usually have a large outside diameter in the range of 305 to 1800 mm, while Grinding discs for hand-held grinding machines have an outer diameter from 100 to 300 mm and in special cases up to 400 mm.
  • the invention has for its object a cutting wheel for stationary To create grinding machines in which the amount 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 2 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.
  • the further developments according to claims 3 to 6 indicate how the connection between Support body and slip ring in a particularly simple and particularly durable Way can be designed.
  • Claim 7 gives a particularly simple design for the support body on.
  • Claims 8 to 11 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.
  • Claim 12 specifies a further embodiment of a support body, the is designed to be particularly thin, which ensures that the grinding wheel receives a particularly high flexibility, so that parallel to the Axial forces occurring can be absorbed without the The slip ring breaks off from the edge of the supporting body.
  • the selection of the binder of the slip ring according to claim 14 causes the Slip ring on the one hand is sufficiently hard that it does not lubricate and is self-sharpening at the same time; 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.
  • Claim 16 gives diameter ranges for the outer diameter of the Cutting wheel, while claim 17 ranges for the thickness of the Slip ring indicates.
  • Claim 18 gives areas for the ratio of Outside diameter to inside diameter of the slip ring. Against that Claim 19 the use of a grinding wheel according to the invention.
  • a grinding wheel is shown, which is a cut-off grinding wheel for a stationary grinding machine. It has a ring-cylindrical slip ring 1, into which a likewise ring-cylindrical support body 2 is glued.
  • the slip ring 1 has an annular recess 3 which is concentric with the central longitudinal axis 4.
  • the support body 2 is inserted into this recess 3.
  • the diameter of the recess 3, ie the inner diameter Di of the slip ring 1, is a few tenths of a millimeter larger than the outer diameter d of the support body 2.
  • the slip ring 1 has an outer diameter Da, the following applying to the ratio Da / Di: 1.4 ⁇ Da / Di ⁇ 2, ie the slip ring 1 has a relatively large recess 3 with respect to its outer diameter Da. This is only approximate; Details are set out below.
  • the outer diameter Da is 300 mm ⁇ Da ⁇ 1800 mm and in particular 450 mm ⁇ Da ⁇ 1800 mm.
  • the thickness a of the slip ring 1 in the direction of the axis 4 is greater than that Thickness b of the support body 2 in the direction of the axis 4, so that the slip ring 1 with both end faces 5, 5 'over the end faces 6, 6' of the supporting body 2 stands out.
  • the thickness of the support body 2 in Direction of the axis 4 be equal to the thickness of the slip ring 1, wherein then the slip ring 1 and the support body 2 are arranged plane-parallel to each other are; for cutting discs, however, it is advantageous if the thickness b of the support body 2 in the direction of the axis 4 is slightly less than that Thickness a of the slip ring 1 to immerse the cutting wheel in enable or facilitate a workpiece to be cut.
  • a of the slip ring 1 of grinding wheels for stationary Use applies 3.3 mm ⁇ a ⁇ 18.0 mm and in particular 4.5 mm ⁇ a ⁇ 18.00 mm.
  • the slip ring 1 and the support body 2 are together by means of a suitable adhesive, preferably modified Phenolic resin.
  • a suitable adhesive preferably modified Phenolic 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.
  • 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 '.
  • the support body 2 has a receiving opening formed concentrically to the axis 4 13 for the drive shaft of a stationary grinding machine, on.
  • the support body 2 is made of metal, usually from Stole. 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 1500 ⁇ 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 grinding wheels is to be used.
  • a reinforcement layer 14 or 14 ' is formed from one or more reinforcing threads 18, which in optimal Counteract tangential and radial expansions of the slip ring 1.
  • the reinforcing threads run in the region of a central opening 19 18 exactly tangential; they then run radially-tangentially to to the outer circumference and are redirected there and again straight to Opening 19 returned where they are tangentially passed. You run thus essentially according to the actual stress of the rotating slip rings 1.
  • the greatest main tension of a rotating 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 to say radially on the inside in the region of the inner peripheral surface 7 of the Slip ring 1, its highest value, which decreases steadily to the outside.
  • the reinforcing threads 18 only run exactly tangential in the area of the opening 19 that they but receive a radial component between the opening 19 and the outer edge, to counteract the radial tension, which is also strong in this area.
  • the reinforcing threads 18 are at the respective crossing points 20 connected to each other, by a synthetic resin.
  • the Reinforcing threads 18 become the one shown in Fig. 3 before laying Pattern soaked in a synthetic resin solution.
  • the reinforcement layer 14 or 14 ' is therefore sufficient intrinsically stable to be used for the production of a slip ring 1. Except in the area of the outer deflection points 21 and the inner ones The reinforcing threads 18 run in the region of the opening 19 straightforward.
  • the inner diameter D'i of the reinforcement layer 14 or 14 ' corresponds essentially to the inner diameter Di of the slip ring 1. The same applies to the ratio of the outer diameter D'a Reinforcement layer 14 or 14 'in relation to the diameter of the Slip ring 1.
  • the apex angle c of the reinforcing threads 18 in the area the deflection points 21 are directed when the radius of curvature, not shown is neglected in the area of the deflection points 21, exclusively according to the ratio of D'a to D'i. Because the reinforcement threads 18 arranged essentially like the legs of an isosceles triangle are also referred to as triangles.
  • 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 stationary grinding machines are.
  • the reinforcing threads 18 are each from the central opening 19 according to 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.
  • 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 inserted into the mold and another reinforcement layer 14 is placed on it. A pressure of 50 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 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 shows a cutting wheel, on the one hand Slip ring 1 and on the other hand has a support body 2 '.
  • the slip ring 1 essentially corresponds in structure to that described above Structure, wherein it is provided with reinforcement layers 14, 14 'as they are 4 and are described above for this purpose.
  • the support body 2 ' consists of sheet steel, possibly stainless Steel, aluminum or brass, whose thickness e applies 0.6 mm ⁇ e ⁇ 3.0 mm.
  • the very thin support body 2 ' is an annular 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 anterior peripheral surface 9 ' is connected to the slip ring 1.
  • the slip ring 1 is immediately on the outer circumferential surface 9 'of the annular cylindrical edge 24, which is further explained in the following description of the manufacture becomes.
  • the cutting wheel as shown in FIGS. 5 and 6 is against lateral forces, i.e. against forces acting on the slip ring 1 engage at a radial distance from the supporting 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 therefore also flexible parallel to axis 4.
  • 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 ' may 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 torsional forces to be transmitted to the supporting body 2 'and also those mentioned Transfer side bending forces from the slip ring 1 to the support body 2 ' to be able to.
  • Cut-off wheels of this design are used in stationary use preferably used in the lower diameter range, i.e. it applies 300 mm ⁇ Da ⁇ 500 mm and in particular 450 mm ⁇ Da ⁇ 500 mm.
  • For axial extension b of the margin 24 applies that it should only be insignificantly smaller than the thickness a.
  • 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 A reinforcement 14 or 14 'is present in the grinding ring 1 in the slip ring 1 is, the reinforcing threads 18 run purely tangential in this area and therefore the high occurring here in a particularly favorable manner Can absorb tangential forces.
  • the support body 2 ' should be 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, copper plating or painting of the support body 2 ' Consider, but especially a plasma polymer treatment of Carrying body 2 ', because such treatment on the one hand extreme cleaning takes place and on the other hand a particularly high adhesiveness is achieved, which is particularly for the outer peripheral surface 9 ' is cheap.
  • 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 support 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 1500 microns, binder 16 and filler 17, the binder is also a phenol-formaldehyde adhesive, which is usually 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 granules are then pressed with the support body 2 'under a pressure of 50 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 adhesive with numerous modification options have here as proven particularly advantageous.
  • 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.
  • a stationary grinding machine 26 is indicated, one of has a motor-driven grinding spindle 27.
  • a receiving flange 28 is attached, which in the usual way receives ring-cylindrical support body 2 or 2 'centered.
  • the in the Drawing shown grinding wheel corresponds - in simplified Representation - which according to FIGS. 5 and 6.
  • the support body 2 and 2 ' is located with its end face 6 'or 6' 'against the receiving flange 28.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

A cutting-off grinding disc for stationary grinding machines has an annular-cylindrical inner carrying element (2) made of metal and a grinding ring (1) surrounding the latter, these being connected to one another. The grinding ring (1) projects beyond the carrying element (2) on both sides in the direction of the common axis (4). The grinding ring (1) can be fully worn down. The carrying element (2) is reusable or at least recyclable. <IMAGE>

Description

Die Erfindung betrifft eine Trenn-Schleifscheibe für stationäre Schleifmaschinen und deren Verwendung. The invention relates to a cutting wheel for stationary Grinding machines and their use.

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 sowohl darin, daß die Schleifscheiben auf den Schleifspindeln mit Hilfe von Flanschen aufgespannt werden, die sich über einen beträchtlichen Teil des Durchmessers der Schleifscheibe erstrecken, als auch darin, daß der Durchmesser des zu trennenden Guts einen weiteren Einsatz der Trennscheibe unmöglich macht. 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 stationäre Schleifmaschinen in erheblichem Maße Seitenkräfte aufnehmen können müssen. Darüber hinaus können die Flanschplatten beim Trennschleifen nicht in das Werkstück eintauchen. 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 lies in the fact that the Grinding disks clamped on the grinding spindles with the help of flanges that are spread over a substantial portion of the diameter extend the grinding wheel, as well as in that the diameter of the goods to be separated impossible to use the cutting disc again makes. Clamping the grinding wheels is necessary because the fabric reinforcements only then absorb the occurring tangential forces can, if they have a sufficient radial range - starting from their inner recess - are clamped. Furthermore, these are reinforcement layers necessary because such grinding wheels for stationary Grinding machines must be able to absorb considerable lateral forces. In addition, the flange plates cannot when grinding plunge into the workpiece.  

Aus der EP 0 530 691 A1 sind Schleifscheiben bekannt, die einen lösbar mit dem Schleifring verspannten bzw. verspannbaren Tragkörper aufweisen, so daß der Tragkörper wiederverwendbar ist. Mit dieser Lösung kann der Schleifring sehr viel weiter abgearbeitet werden, als dies bisher möglich war. Ein Rest des Schleifrings muß allerdings auch hier entsorgt werden. Grinding wheels are known from EP 0 530 691 A1, which can be detached have support bodies braced or braced with the slip ring, so that the support body is reusable. With this solution you can the slip ring can be processed much further than before was possible. A rest of the slip ring must also be disposed of here will.

Der nächstkommende Stand der Technik ergibt sich aus der nicht vorveröffentlichten EP-A2-0 612 586 - Artikel 54(3) EPÜ - die eine Trenn-Schleifscheibe für handgeführte Schleifmaschinen,

  • mit einem inneren, ringscheibenförmig ausgebildeten Tragkörper und
  • mit einem mindestens eine Armierungslage und eine Kunstharzbindung des Schleifkorns aufweisenden, ringscheibenförmig ausgebildeten Schleifring mit einer konzentrisch zu einer Mittel-Längs-Achse ausgebildeten Ausnehmung, in der der Tragkörper angeordnet und mit dem Schleifring (1) verbunden ist, offenbart. Diese Schleifscheibe läßt sich abfallfrei einsetzen.
The closest prior art results from the unpublished EP-A2-0 612 586 - Article 54 (3) EPC - which is a cut-off wheel for hand-held grinding machines,
  • with an inner, ring-shaped support body and
  • with an at least one reinforcing layer and a synthetic resin bond of the abrasive grain, an annular disk-shaped slip ring with a concentric to a central longitudinal axis recess in which the support body is arranged and connected to the slip ring (1). This grinding wheel can be used without waste.

Weiterhin ist es aus der DE 23 11 506 A und der PCT WO 91/05636 bekannt, bei Trenn-Schleifscheiben für stationäre Schleifmaschinen einen Tragkörper vorzusehen, an dessen Außenrandbereich Schleifsegmente aufgespannt werden, die über den Umfang einen Schleifring bilden, der aber nicht über den Umfang geschlossen ist. Der Tragkörper ist wiederverwendbar. Die Schleifsegmente sind nicht abfallfrei aufbrauchbar. Des weiteren sind diese Schleifsegmente gegen Ausbruch gefährdet, was zu einer Zerstörung des Werkstücks und/oder der Schleifscheibe und/oder der Schleifmaschine führen kann. Furthermore, it is known from DE 23 11 506 A and PCT WO 91/05636, one for cutting-off wheels for stationary grinding machines To provide support body, on the outer edge area stretched grinding segments be that form a slip ring over the circumference, but is not closed on the scope. The support body is reusable. The grinding segments cannot be used up without waste. Furthermore these grinding segments are at risk of breakout, leading to destruction of the workpiece and / or the grinding wheel and / or the grinding machine can lead.

Trenn-Schleifscheiben für stationäre Schleifmaschinen haben in der Regel einen großen Außendurchmesser im Bereich von 305 bis 1800 mm, während Schleifscheiben für handgeführte Schleifmaschinen einen Außendurchmesser von 100 bis 300 mm und in Sonderfällen bis 400 mm aufweisen. Cut-off wheels for stationary grinding machines usually have a large outside diameter in the range of 305 to 1800 mm, while Grinding discs for hand-held grinding machines have an outer diameter from 100 to 300 mm and in special cases up to 400 mm.

Der Erfindung liegt die Aufgabe zugrunde, eine Trenn-Schleifscheibe für stationäre Schleifmaschinen zu schaffen, bei der die zu entsorgende Abfallmenge stark reduziert ist. The invention has for its object a cutting wheel for stationary To create grinding machines in which the amount 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 2 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. Die Weiterbildungen nach den Ansprüchen 3 bis 6 geben an, wie bei einer Ausgestaltung die Verbindung zwischen Tragkörper und Schleifring in besonders einfacher und besonders haltbarer Weise ausgestaltet sein kann. 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 2 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. The further developments according to claims 3 to 6 indicate how the connection between Support body and slip ring in a particularly simple and particularly durable Way can be designed.

Anspruch 7 gibt eine besonders einfache Ausbildung für den Tragkörper an. Claim 7 gives a particularly simple design for the support body on.

Die Ansprüche 8 bis 11 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 8 to 11 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.

Anspruch 12 gibt eine weitere Ausgestaltung eines Tragkörpers an, der besonders dünn ausgestaltet ist, wodurch erreicht wird, daß die Schleifscheibe eine besonders hohe Biegeeleastizität erhält, so daß parallel zur Achse auftretende Seitenkräfte aufgefangen werden können, ohne daß der Schleifring vom Rand des Tragkörpers abbricht. 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. Claim 12 specifies a further embodiment of a support body, the is designed to be particularly thin, which ensures that the grinding wheel receives a particularly high flexibility, so that parallel to the Axial forces occurring can be absorbed without the The slip ring breaks off from the edge of the supporting body. Through a special kind the manufacture it is possible to have a particularly intensive interlocking of To achieve slip ring and support body according to claim 13. The selection of the binder of the slip ring according to claim 14 causes the Slip ring on the one hand is sufficiently hard that it does not lubricate and is self-sharpening at the same time; 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.

Anspruch 16 gibt Durchmesserbereiche für den Außendurchmesser der Trenn-Schleifscheibe an, während Anspruch 17 Bereiche für die Dicke des Schleifrings angibt. Anspruch 18 gibt Bereiche für das Verhältnis von Außendurchmesser zu Innendurchmesser des Schleifrings an. Dagegen gibt Anspruch 19 die Verwendung einer erfindungsgemäßen Schleifscheibe an. Claim 16 gives diameter ranges for the outer diameter of the Cutting wheel, while claim 17 ranges for the thickness of the   Slip ring indicates. Claim 18 gives areas for the ratio of Outside diameter to inside diameter of the slip ring. Against that Claim 19 the use of a grinding wheel according to the invention.

Weitere Merkmale, 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
einen Teil-Querschnitt durch eine weitere Ausführungsform einer Trenn-Schleifscheibe,
Fig. 6
einen Teilausschnitt aus Fig. 5 in vergrößertem Maßstab und
Fig. 7
eine Teil-Ansicht einer stationären Schleifmaschine mit einer Trenn-Schleifscheibe in stark vereinfachter Darstellung.
Further features, advantages and details of the invention result 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 partial cross section through a further embodiment of a cutting wheel,
Fig. 6
a partial section of FIG. 5 on an enlarged scale and
Fig. 7
a partial view of a stationary grinding machine with a cutting wheel in a greatly simplified representation.

In Fig. 1 ist eine Schleifscheibe dargestellt, bei der es sich um eine Trenn-Schleifscheibe für eine stationäre 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. Dies gilt nur angenähert; Einzelheiten werden weiter unten noch dargelegt. Für den Außendurchmesser Da gilt 300 mm ≤ Da ≤ 1800 mm und insbesondere 450 mm ≤ Da ≤ 1800 mm. In Fig. 1, a grinding wheel is shown, which is a cut-off grinding wheel for a stationary grinding machine. It has a ring-cylindrical slip ring 1, into which a likewise ring-cylindrical support body 2 is glued. The slip ring 1 has an annular recess 3 which is concentric with the central longitudinal axis 4. The support body 2 is inserted into this recess 3. The diameter of the recess 3, ie the inner diameter Di of the slip ring 1, is a few tenths of a millimeter larger than the outer diameter d of the support body 2. The slip ring 1 has an outer diameter Da, the following applying to the ratio Da / Di:
1.4 <Da / Di <2, ie the slip ring 1 has a relatively large recess 3 with respect to its outer diameter Da. This is only approximate; Details are set out below. The outer diameter Da is 300 mm ≤ Da ≤ 1800 mm and in particular 450 mm ≤ Da ≤ 1800 mm.

Die Dicke a des Schleifrings 1 in Richtung der Achse 4 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. Für die Dicke a des Schleifrings 1 von Trenn-Schleifscheiben für stationären Einsatz gilt 3,3 mm ≤ a ≤ 18,0 mm und insbesondere 4,5 mm ≤ a ≤ 18,00 mm. Der Schleifring 1 und der Tragkörper 2 sind miteinander mittels eines geeigneten Klebstoffes, vorzugsweise modifiziertem Phenolharz, 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 greater than that Thickness b of the support body 2 in the direction of the axis 4, so that the slip ring 1 with both end faces 5, 5 'over the end faces 6, 6' of the supporting body 2 stands out. Basically, the thickness of the support body 2 in Direction of the axis 4 be equal to the thickness of the slip ring 1, wherein then the slip ring 1 and the support body 2 are arranged plane-parallel to each other are; for cutting discs, however, it is advantageous if the thickness b of the support body 2 in the direction of the axis 4 is slightly less than that Thickness a of the slip ring 1 to immerse the cutting wheel in enable or facilitate a workpiece to be cut. For the thickness a of the slip ring 1 of grinding wheels for stationary Use applies 3.3 mm ≤ a ≤ 18.0 mm and in particular 4.5 mm ≤ a ≤ 18.00 mm. The slip ring 1 and the support body 2 are together by means of a suitable adhesive, preferably modified Phenolic 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 stationären 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 stationary grinding machine, on. The support body 2 is made of metal, usually from Stole. 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 1500 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 1500 µm.

Fig. 3 zeigt eine in der DE 38 19 199 C2 beschriebene Armierungslage 14 bzw. 14', die bevorzugt anstelle eines Gewebes bei derartigen 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 7 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 grinding wheels is to be used. Such a reinforcement layer 14 or 14 ' is formed from one or more reinforcing threads 18, which in optimal Counteract tangential and radial expansions of the slip ring 1. The reinforcing threads run in the region of a central opening 19 18 exactly tangential; they then run radially-tangentially to to the outer circumference and are redirected there and again straight to Opening 19 returned where they are tangentially passed. You run thus essentially according to the actual stress of the rotating slip rings 1. The greatest main tension of a rotating 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 to say radially on the inside in the region of the inner peripheral surface 7 of the Slip ring 1, its highest value, which decreases steadily to the outside. Out for this reason it is also justifiable that the reinforcing threads 18 only run exactly tangential in the area of the opening 19 that they but receive a radial component between the opening 19 and the outer edge, to counteract the radial tension, which is also strong in this area. The reinforcing threads 18 are at the respective crossing points 20 connected to each other, by a synthetic resin. The Reinforcing threads 18 become the one shown in Fig. 3 before laying Pattern soaked in a synthetic resin solution. After laying the reinforcing threads 18 are hot-pressed, whereby this synthetic resin hardens, so that a connection of the reinforcing threads 18 at the crossing points 20 occurs. The reinforcement layer 14 or 14 'is therefore sufficient intrinsically stable to be used for the production of a slip ring 1. Except in the area of the outer deflection points 21 and the inner ones   The reinforcing threads 18 run in the region of the opening 19 straightforward. The inner diameter D'i of the reinforcement layer 14 or 14 ' corresponds essentially to the inner diameter Di of the slip ring 1. The same applies to the ratio of the outer diameter D'a Reinforcement layer 14 or 14 'in relation to the diameter of the Slip ring 1. The apex angle c of the reinforcing threads 18 in the area the deflection points 21 are directed when the radius of curvature, not shown is neglected in the area of the deflection points 21, exclusively according to the ratio of D'a to D'i. Because the reinforcement threads 18 arranged essentially like the legs of an isosceles triangle are also referred to as triangles.

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 stationäre 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 stationary grinding machines are. In this embodiment, the reinforcing threads 18 are each from the central opening 19 according to 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.

Nachfolgend wird die Herstellung einer Schleifscheibe anhand zweier Beispiele erläutert: The following is the production of a grinding wheel using two 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 50 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 inserted into the mold and another reinforcement layer 14 is placed on it. A pressure of 50 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.

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.

Fig. 5 und 6 zeigen eine Trenn-Schleifscheibe, die einerseits einen Schleifring 1 und andererseits einen Tragkörper 2' aufweist. Der Schleifring 1 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. 5 and 6 show a cutting wheel, on the one hand Slip ring 1 and on the other hand has a support body 2 '. The slip ring 1 essentially corresponds in structure to that described above Structure, wherein it is provided with reinforcement layers 14, 14 'as they are 4 and are described above for this purpose.

Der Tragkörper 2' besteht aus Stahl-Blech, gegebenenfalls rostfreiem Stahl, Aluminium oder Messing, für dessen Dicke e gilt 0,6 mm ≤ e ≤ 3,0 mm. The support body 2 'consists of sheet steel, possibly stainless Steel, aluminum or brass, whose thickness e applies 0.6 mm ≤ e ≤ 3.0 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 stationären 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 stationary 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 Anßenumfangsfläche 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. 5 und 6 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 kann 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. At the outer edge, the very thin support body 2 'is an annular 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 anterior peripheral surface 9 ' is connected to the slip ring 1. The slip ring 1 is immediately on the outer circumferential surface 9 'of the annular cylindrical edge 24, which is further explained in the following description of the manufacture becomes. The cutting wheel, as shown in FIGS. 5 and 6 is against lateral forces, i.e. against forces acting on the slip ring 1 engage at a radial distance from the supporting 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 therefore also flexible 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 'may 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 torsional forces to be transmitted to the supporting body 2 'and also those mentioned Transfer side bending forces from the slip ring 1 to the support body 2 ' to be able to.

Trenn-Schleifscheiben dieser Ausgestaltung werden bei stationärem Einsatz bevorzugt im unteren Durchmesserbereich eingesetzt, d.h. es gilt 300 mm ≤ Da ≤ 500 mm und insbesondere 450 mm ≤ Da ≤ 500 mm. Entsprechendes gilt für die Dicke a des Schleifrings 1. Sie ist im Bereich von 3,3 bis 7,0 mm und insbesondere von 4,5 bis 7,0 mm. Daraus ergibt sich, daß die Dicke e des Tragkörpers 2' 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. Cut-off wheels of this design are used in stationary use preferably used in the lower diameter range, i.e. it applies 300 mm ≤ Da ≤ 500 mm and in particular 450 mm ≤ Da ≤ 500 mm. The same applies to the thickness a of the slip ring 1. It is in the range from 3.3 to 7.0 mm and in particular from 4.5 to 7.0 mm. It follows that the thickness e of the support body 2 'is less than the thickness a of the slip ring 1. The following applies: 0.1 a ≤ e ≤ 0.25a. For axial extension b of the margin 24 applies that it should only be insignificantly smaller than the 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 14 oder 14' 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, Verkupfern oder Lackieren 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 A reinforcement 14 or 14 'is present in the grinding ring 1 in the slip ring 1 is, the reinforcing threads 18 run purely tangential in this area and therefore the high occurring here in a particularly favorable manner Can absorb tangential forces. So that the firm connection between Support body 2 'and slip ring 1 on the outer circumferential surface 9' are not   is negatively affected, the support body 2 'should be a surface treatment have been subjected to surface oxidation, in particular Rust formation in non-stainless steel, counteracts. Therefor comes nickel plating, copper plating or painting of the support body 2 ' Consider, but especially a plasma polymer treatment of Carrying body 2 ', because such treatment on the one hand extreme cleaning takes place and on the other hand a particularly high adhesiveness is achieved, which is particularly for the outer peripheral surface 9 ' is cheap.

Nachfolgend wird beispielhaft die Herstellung der Trenn-Schleifscheibe nach den Fig. 5 und 6 erläutert: The production of the cutting wheel is shown below as an example 5 and 6 explained:

Beispiel III:Example III

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 1500 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 50 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 support 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 1500 microns, binder 16 and filler 17, the binder is also a phenol-formaldehyde adhesive, which is usually 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 granules are then pressed with the support body 2 'under a pressure of 50 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-Klebstoff 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 adhesive with numerous modification options have here as proven particularly advantageous.

Wie Fig. 6 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. 6 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.

In Fig. 7 ist eine stationäre Schleifmaschine 26 angedeutet, die eine von einem Motor antreibbare Schleifspindel 27 aufweist. Auf dieser Schleifspindel 27 ist ein Aufnahmeflansch 28 angebracht, der in üblicher Weise den ringzylindrischen Tragkörper 2 bzw. 2' zentriert aufnimmt. Die in der Zeichnung dargestellte Trenn-Schleifscheibe entspricht - in vereinfachter Darstellung - der nach den Fig. 5 und 6. Der Tragkörper 2 bzw. 2' liegt mit seiner Stirnseite 6' bzw. 6'' gegen den Aufnahmeflansch 28 an. Gegen die andere Stirnseite 6 des Tragkörpers 2 bzw. 2' liegt ein auf die Schleifspindel 27 nach dem Aufstecken der Trenn-Schleifscheibe aufsteckbarer Spannflansch 29 an. Die Befestigung erfolgt mittels einer Spannmutter 30, die auf einen Gewindezapfen 31 der Schleifspindel 27 aufgeschraubt wird. In Fig. 7, a stationary grinding machine 26 is indicated, one of has a motor-driven grinding spindle 27. On this grinding spindle 27 is a receiving flange 28 is attached, which in the usual way receives ring-cylindrical support body 2 or 2 'centered. The in the Drawing shown grinding wheel corresponds - in simplified Representation - which according to FIGS. 5 and 6. The support body 2 and 2 'is located with its end face 6 'or 6' 'against the receiving flange 28. Against the other end face 6 of the support body 2 or 2 'is on the Grinding spindle 27 after the cutting-off grinding wheel has been plugged on Clamping flange 29 on. It is attached using a tension nut 30, which is screwed onto a threaded pin 31 of the grinding spindle 27 becomes.

Der Durchmesser A der Flansche 28, 29 hat eine von der Ausgestaltung der stationären Schleifmaschine 26 her vorgegebene Größe, wobei für die vorliegende Beschreibung davon ausgegangen wird, daß der Aufnahmeflansch 28 und der Spannflansch 29 denselben Durchmesser haben. Sollte dies nicht der Fall sein, so entspricht A dem größeren Durchmesser. Um ein Werkstück 32 vollständig durchtrennen zu können und gleichzeitig den gesamten Schleifring 1 vollständig aufbrauchen zu können, gilt im Hinblick auf eine vorgegebene größtmögliche Dicke f eines solchen Werkstücks 32 für den Innendurchmesser Di des Schleifrings 1 Di ≥ A + 2 f. Ein Beispiel soll die Maßangaben verdeutlichen. Es zeigt

  • A = 330 mm
  • f = 100 mm
  • Di = 560 mm
  • Da = 1000 mm.
    • In diesem Beispiel hat der Innendurchmesser Di des Schleifrings 1 ein Übermaß gegenüber dem Durchmesser A der Flansche 28, 29 und der doppelten Dicke f des Werkstücks 32 von insgesamt 30 mm. Das Werkstück 32 kann also auch bei praktisch aufgebrauchtem Schleifring 1 durchtrennt werden, ohne daß es am Ende des Durchtrennens an den Flanschen 28, 29 anstößt. Für das Verhältnis des Außendurchmessers Da zum Innendurchmesser Di des Schleifrings 1 gilt Da/Di = 1000/560 = 1,79. Es liegt also in dem oben angegebenen Bereich. The diameter A of the flanges 28, 29 has a size which is predetermined by the design of the stationary grinding machine 26, it being assumed for the present description that the receiving flange 28 and the clamping flange 29 have the same diameter. If this is not the case, A corresponds to the larger diameter. In order to be able to completely cut through a workpiece 32 and, at the same time, to be able to completely use up the entire slip ring 1, the inner diameter Di of the slip ring applies to a given maximum possible thickness f of such a workpiece 32 1 Di ≥ A + 2 f . An example should clarify the dimensions. It shows
  • A = 330 mm
  • f = 100 mm
  • Di = 560 mm
  • Da = 1000 mm.
    • In this example, the inner diameter Di of the slip ring 1 has an oversize compared to the diameter A of the flanges 28, 29 and twice the thickness f of the workpiece 32 of a total of 30 mm. The workpiece 32 can thus be severed even when the slip ring 1 is practically used up, without it abutting the flanges 28, 29 at the end of the severing. The following applies to the ratio of the outer diameter Da to the inner diameter Di of the slip ring 1 Da / Di = 1000/560 = 1.79 . So it is in the range given above.

    Bei den vorstehenden Angaben wird davon ausgegangen, daß die stationäre Schleifmaschine 26 so ausgebildet ist, daß das Werkstück 32 auch in seiner den Flanschen 28, 29 nächstliegenden, in Fig. 7 gestrichelt eingezeichneten Stellung nicht mit der Schleifmaschine 26 in Kollision kommt. The above information assumes that the stationary Grinding machine 26 is designed so that the workpiece 32 also in its closest to the flanges 28, 29, shown in broken lines in FIG. 7 Position does not come into collision with the grinding machine 26.

    Claims (19)

    1. An abrasive cutting-off wheel for stationary grinding machines, comprising
      an inner support (2, 2') in the form of an annular disk, and
      a grinding ring (1) in the form of an annular disk having at least one reinforcement layer (14, 14') and resinoid bonding of the abrasive grain and a recess (3), which is formed concentrically of a central longitudinal axis (4) and in which the support (2, 2') is disposed and joined to the abrasive ring (1),
      wherein 305 mm ≤ Da ≤ 1800 mm applies to the outside diameter (Da) of the abrasive ring (1).
    2. An abrasive wheel according to claim 1, characterized in that at least one front face (5) of the abrasive ring (1) projects from a front face (6) of the support (2, 2').
    3. An abrasive wheel according to claim 1 or 2, characterized in that the abrasive ring (1) and the support (2, 2') are glued together.
    4. An abrasive wheel according to one of claims 1 to 3, wherein a gap (7) that is filled with a glue layer (10) is formed between the outer circumferential surface (9) of the support (2) and the inner circumferential surface (8) of the abrasive ring (1) which defines a recess (3).
    5. An abrasive wheel according to one of claims 1 to 4, characterized in that the inner circumferential surface (8) of the abrasive ring (1), which defines the recess (3), and/or the outer circumferential surface (9, 9') of the support (2, 2') are cylindrical.
    6. An abrasive wheel according to claim 3, characterized in that the abrasive ring (1) and the support (2) are glued together by means of modified phenolic resin.
    7. An abrasive wheel according to one of claims 1 to 6, characterized in that the support (2, 2') consists of sheet metal.
    8. An abrasive wheel according to one of claims 1 to 7, characterized in that the reinforcement layer (14, 14') consists of reinforcing threads (18) which run tangentially in the vicinity of a central opening (19) and radially tangentially towards the outer circumference and which are deflected at the outer circumference.
    9. An abrasive wheel according to claim 8, characterized in that the reinforcing threads (18) extend tangentially and radially tangentially in a straight line.
    10. An abrasive wheel according to claim 8, characterized in that the reinforcing threads (18) partially spiral from the central opening (19) towards the outer circumference.
    11. An abrasive wheel according to claim 8 to 10, characterized in that the reinforcing threads (18) are glued together at their positions of intersection (20).
    12. An abrasive wheel according to claim 7, characterized in that the thickness (e) of said support (2') is less than the thickness (a) of said abrasive ring (1) and in that, on its outer circumference, the support (2') is provided with a substantially annular cylindrical rim (24), the length (b) of which in the direction of the central longitudinal axis (4) exceeds the thickness (e) of the support (2'), and on the outer circumferential surface (9') of which the abrasive ring (1) is mounted.
    13. An abrasive wheel according to claim 12, characterized in that the abrasive grain (15) is partially forced into said 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) comprises a poly-condensation adhesive as a bonding agent (16).
    15. An abrasive wheel according to one of claims 12 to 14, characterized in that the outer circumferential surface (9') of the rim (24) is provided with a glue layer (25) of the same kind as that of the bonding agent of the abrasive ring (1).
    16. An abrasive wheel according to one of claims 1 to 15, characterized in that 450 mm ≤ Da ≤ 1800 mm applies to the outside diameter (Da) of the abrasive ring (1).
    17. An abrasive wheel according to one of claims 1 to 6, characterized in that 3.3 mm ≤ a ≤ 20.0 mm, and in particular 4.5 mm ≤ a ≤ 20.0 mm, applies to the thickness (a) of the abrasive ring (1).
    18. An abrasive wheel according to one of claims 1 to 17, characterized in that 1.4 ≤ Da/Di ≤ 2.0 applies to the ratio that the outside diameter (Da) bears to the inside diameter (Di) of the abrasive ring (1).
    19. Use of the abrasive cutting-off wheel according to one of claims 1 to 18 on a stationary grinding machine (26) which comprises a grinding spindle (27) with at least one clamping flange (29) of a greatest diameter (A) for a workpiece (32) of a thickness (f) to be cut through, Di ≥ A + 2f applying to the inside diameter (Di) of the abrasive ring (1).
    EP94115358A 1993-11-11 1994-09-29 Cutting-off grinding disc for stationary grinding machine and use of same Expired - Lifetime EP0657251B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE4338492A DE4338492A1 (en) 1993-11-11 1993-11-11 Cutting-off wheel for stationary grinding machines and their use
    DE4338492 1993-11-11

    Publications (2)

    Publication Number Publication Date
    EP0657251A1 EP0657251A1 (en) 1995-06-14
    EP0657251B1 true EP0657251B1 (en) 1998-05-06

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    Application Number Title Priority Date Filing Date
    EP94115358A Expired - Lifetime EP0657251B1 (en) 1993-11-11 1994-09-29 Cutting-off grinding disc for stationary grinding machine and use of same

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    EP (1) EP0657251B1 (en)
    AT (1) ATE165756T1 (en)
    DE (2) DE4338492A1 (en)
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    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    PT1332822E (en) * 2002-01-16 2007-11-16 Swarovski Tyrolit Schleif Bandsaw
    ES2682295T3 (en) 2008-12-30 2018-09-19 Saint-Gobain Abrasives, Inc. Reinforced chipboard abrasive tools
    DE102010016742A1 (en) * 2010-05-03 2011-11-03 Dietrich Wetzel Kg Grinding and cutting disk is made of bonded abrasives with textile reinforcement, where textile reinforcement is piece of embroidery, particularly glass fiber embroidery
    CN113681726B (en) * 2021-08-24 2022-09-09 北新集团建材股份有限公司 Gypsum board high-speed saw cutting system and tool bit thereof

    Family Cites Families (14)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3123948A (en) * 1964-03-10 Reinforced
    DE661847C (en) * 1938-06-28 Carl Krug Dr Ing Rotating grinding tool
    BE528134A (en) *
    DE606001C (en) * 1932-07-19 1934-11-23 Emil Motl Cutting and grinding disc with a disc-shaped carrier made of metal
    DE1769713U (en) * 1958-05-09 1958-07-03 Herm Schwarzhaupt & Soehne CUTTING-OFF DISC.
    DE1291648B (en) * 1962-12-04 1969-03-27 Itt Ind Gmbh Deutsche Grinding wheel with reinforcement mesh
    DE1502644A1 (en) * 1964-02-10 1969-10-30 Norton Co Method and device for the production of reinforced grinding wheels
    US3487590A (en) * 1967-02-02 1970-01-06 Itt Reinforced grinding wheel
    DE2156770C3 (en) * 1971-11-16 1974-06-20 Hermann 7031 Maichingen Hefner Device for the releasable fastening of a grinding wheel or the like on a drive spindle
    DE7240816U (en) * 1972-11-07 1973-03-15 Winter E & Sohn Circular saw blade with a ring-shaped diamond grinding layer
    DE2719741A1 (en) * 1977-05-03 1978-11-09 Geb Riemer Elfriede Peltz Abrasive disc for slitting semiconductor wafers - is made by bonding galvanically made abrasive disc onto metal disc
    DE83380T1 (en) * 1981-12-30 1984-02-16 Jiro Sagamihara Kanagawa Inoue DIAMOND STONE SAW.
    US4794737A (en) * 1987-03-06 1989-01-03 Black & Decker Inc. Universal backing flange
    ATE174544T1 (en) * 1993-02-15 1999-01-15 Rueggeberg August Gmbh & Co GRINDING DISC FOR HAND-HELD GRINDING MACHINES, ESPECIALLY CUT-OFF GRINDING DISC

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    Publication number Publication date
    DE59405896D1 (en) 1998-06-10
    DE4338492A1 (en) 1995-05-18
    ATE165756T1 (en) 1998-05-15
    ES2115835T3 (en) 1998-07-01
    EP0657251A1 (en) 1995-06-14

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