EP0832720A2 - Disque de meulage pour meuleuse portative, en particulier disque de tronçonnage - Google Patents

Disque de meulage pour meuleuse portative, en particulier disque de tronçonnage Download PDF

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Publication number
EP0832720A2
EP0832720A2 EP97121891A EP97121891A EP0832720A2 EP 0832720 A2 EP0832720 A2 EP 0832720A2 EP 97121891 A EP97121891 A EP 97121891A EP 97121891 A EP97121891 A EP 97121891A EP 0832720 A2 EP0832720 A2 EP 0832720A2
Authority
EP
European Patent Office
Prior art keywords
slip ring
grinding wheel
support body
wheel according
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.)
Withdrawn
Application number
EP97121891A
Other languages
German (de)
English (en)
Other versions
EP0832720A3 (fr
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
Application filed by August Rueggeberg GmbH and Co KG filed Critical August Rueggeberg GmbH and Co KG
Priority claimed from EP94100690A external-priority patent/EP0612586B1/fr
Publication of EP0832720A2 publication Critical patent/EP0832720A2/fr
Publication of EP0832720A3 publication Critical patent/EP0832720A3/fr
Withdrawn legal-status Critical Current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
    • B24D5/12—Cut-off wheels
    • 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
    • B24D5/16—Bushings; Mountings

Definitions

  • the invention relates to a grinding wheel according to the preamble of the claim 1.
  • Such grinding wheels are only 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 Share of the grinding wheel is in a range from 30 to 50% of the initial weight of the grinding wheel. This remaining remainder must are disposed of via hazardous waste landfills, which is increasingly causing problems since the number of hazardous waste landfills is declining and because of the cost for this rises sharply. The reason for the relatively high remaining The rest of the unused grinding wheel is that the Grinding wheels on the grinding spindles or shafts of hand-guided Grinding machines between flange plates resting on the end faces to be clamped over a considerable part 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-off grinding wheel can not be consumed by the workpiece thickness corresponds.
  • 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 5 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 7 to 10 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.
  • the selection of the binder of the slip ring according to claim 11 leads on the one hand that the slip ring is sufficiently hard that it does not lubricated and self-sharpening at the same time; on the other hand, the necessary Bending elasticity and the necessary strength of the connection between slip ring and supporting body.
  • a grinding wheel is shown, which is a cut-off grinding wheel for a hand-held grinding machine.
  • She points a ring-cylindrical slip ring 1, in which is also a ring-cylindrical Support body 2 is glued.
  • the slip ring 1 has an annular shape Recess 3, which is concentric to the central longitudinal axis 4th is trained.
  • the support body 2 is inserted into this recess 3.
  • the inside diameter Di des 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 ratio Da / Di applies: 1.4 ⁇ Da / Di ⁇ 2, i.e. H. of the Slip ring 1 has a relative to its outer diameter Da large recess 3.
  • 100 mm ⁇ Da ⁇ 300 applies mm.
  • 100 mm ⁇ Da ⁇ 230 mm applies.
  • 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 support body 2 in Direction of the axis 4, so that the slip ring 1 with both end faces 5, 5 ' protrudes beyond the end faces 6, 6 'of the support body 2.
  • the thickness of the support body 2 in the direction of the axis 4 is equal to the thickness of the Slip ring 1, in which case the slip ring 1 and the support body 2 are arranged plane-parallel to each other; for cutting discs it is from Advantage if the thickness b of the supporting body 2 is somewhat in the direction of the axis 4 is less than the thickness a of the slip ring 1 to immerse the To enable a cutting wheel in a workpiece to be cut or to facilitate.
  • the slip ring 1 and the support body 2 are together by means of a suitable adhesive, preferably 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.
  • abrasive grain 15 preferably made of aluminum oxide, silicon carbide, zirconium corundum, solgel grain or mixtures from this 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 for hand-cut grinding wheels.
  • a reinforcement layer 14 or 14 ' consists of one or more Reinforcement threads 18 formed, which are optimally tangential and counteract radial expansion of the slip ring 1.
  • the reinforcing threads 18 run exactly tangentially; they then run radially tangentially to the outer circumference and are there deflected and in turn returned straight to the opening 19 where it are passed tangentially. They run essentially accordingly the actual stress on the rotating slip rings 1.
  • the greatest principal tension of a rotating slip ring is tangential Direction.
  • the tangential stress i.e.
  • the tangential force curve has in the region of the opening 19, that is to say radially on the inside in the region of the inner peripheral surface 8 of the slip ring 1, its highest value, the outside steadily decreases.
  • the reinforcing threads 18 run exactly tangentially only in the area of the opening 19, that they have a radial component between the opening 19 and the outer edge obtained to the radial tension, which is also strong in this area counteract.
  • the reinforcing threads 18 are on the respective Crossing points 20 connected to each other, namely by a synthetic resin.
  • the reinforcing threads 18 become the one in FIG. 3 before being laid illustrated pattern soaked with a synthetic resin solution.
  • the reinforcement layer 14 or 14 ' is therefore sufficient inherently stable to be used for the production of a slip ring 1 will.
  • 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. Since the reinforcing threads 18 essentially arranged 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 hand-held grinding machines are to be used.
  • 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 of the opening 19 and is in slightly more than a half-spiral rotation to the outside Deflection point 21 performed that there is already an approximate tangential course. As can be seen in FIG. 4, there is a reinforcing thread 18 approximates only point-wise at the central opening 19. Out of it follows that there is no excessive accumulation of reinforcement filament material 18 occurs in the area of the opening 19. This fact and the one described This reinforcement layer 14 leaves the course of the reinforcement threads or 14 'appear even more advantageous than the reinforcement layer according to FIG. 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 Comments apply. It is made of die-cast zinc and is made by injection made in the recess 3 of the slip ring 1.
  • the zinc penetrates in accordance with the enlarged detail Fig. 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.
  • An annealing layer 14 ' is placed in a press mold. Subsequently is an existing of abrasive grain 15, filler 17 and binder 16 Grinding granules entered in the form and another reinforcement layer 14 hung up. A pressure of 500 to is then printed on this package 4000 N / cm2 exerted, whereby the slip ring 1 is compressed. With this Compression occurs an adhesive bond, which is called green strength becomes. During this pressing, the grinding granulate presses, that is Abrasive grain 15, binder 16 and filler 17 each through the reinforcement layer 14 or 14 'to the outside.
  • a support body 2 is placed in each of these finished hardened slip rings 1 glued in the manner already described.
  • the adhesive layer 10 and the adhesive seam 12 forming adhesive is then in one Continuous furnace cured at around 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 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 an internal one in a known manner Have 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 reinforcement layers 14, 14 ', as shown in Fig. 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 is 2 "to 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 circumferential surface 9 "of the annular cylindrical rim 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 support body 2 is itself so also parallel to axis 4 flexible.
  • the entire grinding wheel is flexible as a composite body, i.e. there are no side bending forces Jumps in the bending stress curve in the area of the edge 24, so that the risk of bending failure due to acting parallel to axis 4 Lateral forces are not given.
  • the slip ring 1 is for such forces are flexurally elastic, which on the one hand affects the synthetic resin bond the slip ring 1 and on the other hand to the presence of the reinforcement layers 14, 14 '.
  • the thickness e of the supporting body 2 cant be small; on the other hand, the edge 24 necessary so that the outer peripheral surface 9 "a sufficient axial extent b has to from the slip ring 1 to the support body 2 " transmitting torsional forces and also the mentioned lateral bending forces to be transferred from the slip ring 1 to the support body 2 ".
  • the thickness a of the slip ring 1 of cut-off grinding wheels is in the range from 2 to 4 mm. It follows that the thickness e of the support body 2 "is considerably smaller is the thickness a of the slip ring 1. 0.1 a ⁇ e ⁇ 0.25a applies.
  • 0.8 a ⁇ b ⁇ 1.0 a applies.
  • the special spiral arrangement according to FIG. 4 allows the recess 3 of the slip ring 1 relative to the outer diameter To make very large, which again leads to the fact that the Slip ring 1 can be completely used up during cut-off grinding, to the extent that there are no residues of the slip ring 1 on the edge 24 remain present. This is due to the fact that until the end of the grinding insert there is a reinforcement in the slip ring 1, the reinforcing threads of which 18 run purely tangential in this area and therefore in particular favorably absorb the high tangential forces occurring here can.
  • the outer peripheral surface 9 " is covered with a thin layer 25 of elastic Phenol-formaldehyde adhesive provided that the function of a Has an adhesion promoter and is not absolutely necessary. Then the support body 2 "inserted into a press mold, with its edge facing away from the edge 24 End face 6 "is placed on the bottom of the mold, i.e. the edge 24 is high. Then a reinforcement layer 14 'is inserted, the Opening 19 is completely filled by the support body 2 ". Then grinding granulate is poured into the mold and combed or knife.
  • This grinding granulate consists of the one already described Abrasive grain 15 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 usually identical to that from which layer 25 exists. In any case, it should be a curing polycondensation adhesive be.
  • the second reinforcement layer 14 is placed on the combed or scraped layer of the grinding granulate. Subsequently the grinding granulate is pressed with the supporting body 2 "under a pressure of 500 to 4000 N / cm2.
  • abrasive grain 15 presses into layer 25 on the one hand and on the other also in the outer peripheral surface 9 "of the edge 24, which makes a particular fixed tooth-like connection between the slip ring 1 and the support body 2 "is reached.
  • These compact but not yet hardened Grinding wheels are stacked between steel plates and placed in an oven for hardening and depending on the desired degree of hardness cured at temperatures between 120 and 200 ° C. Manufacturing the connection between slip ring 1 and support body 2 "on the one hand and on the other hand, the hardening of the grinding granulate takes place in one work step.
  • the slip ring 1 itself should have as hard a binder 16 as possible, on the one hand for lubrication to prevent during the grinding process and on the other hand an early Break out the abrasive grain 15 to ensure self-sharpening the grinding wheel is reached.
  • the binder must not be so be hard or brittle that the slip ring 1 breaks off the support body 2 "can occur. Polycondensation adhesives with numerous modification options have proven to be particularly advantageous here.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP97121891A 1993-02-15 1994-01-19 Disque de meulage pour meuleuse portative, en particulier disque de tronçonnage Withdrawn EP0832720A3 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4304513 1993-02-15
DE4304513 1993-02-15
DE4311529A DE4311529A1 (de) 1993-02-15 1993-04-07 Schleifscheibe für handgeführte Schleifmaschinen, insbesondere Trenn-Schleifscheibe
DE4311529 1993-04-07
EP94100690A EP0612586B1 (fr) 1993-02-15 1994-01-19 Disque abrasif pour meuleuse portative, en particulier disque de trançonnage

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP94100690A Division EP0612586B1 (fr) 1993-02-15 1994-01-19 Disque abrasif pour meuleuse portative, en particulier disque de trançonnage

Publications (2)

Publication Number Publication Date
EP0832720A2 true EP0832720A2 (fr) 1998-04-01
EP0832720A3 EP0832720A3 (fr) 2000-12-13

Family

ID=6480484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97121891A Withdrawn EP0832720A3 (fr) 1993-02-15 1994-01-19 Disque de meulage pour meuleuse portative, en particulier disque de tronçonnage

Country Status (3)

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EP (1) EP0832720A3 (fr)
DE (2) DE4311529A1 (fr)
ZA (1) ZA94753B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006042352A1 (fr) 2004-10-19 2006-04-27 Gerhard Gissing Anneau de tronçonneuse à double dispositif de serrage médian
CN104440622A (zh) * 2014-12-04 2015-03-25 张和庆 砂轮生产芯环分拣抓取装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4446591A1 (de) * 1994-12-24 1996-06-27 Schleifmittel Werk Karl Seiffe Recyclefähige Schleifkörperzonen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123948A (en) * 1964-03-10 Reinforced
US3262230A (en) * 1964-02-10 1966-07-26 Norton Co Reinforcement of molded abrasive articles
US3487590A (en) * 1967-02-02 1970-01-06 Itt Reinforced grinding wheel
EP0083380A1 (fr) * 1981-12-30 1983-07-13 Sankyo Diamond Industrial Co., Ltd. Scie diamentée

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE661847C (de) * 1938-06-28 Carl Krug Dr Ing Umlaufendes Schleifwerkzeug
DE1746395U (de) * 1955-09-17 1957-06-06 C Hilzinger Thum Fa Mehrteilige schleif- oder polierscheibe.
DE1291648B (de) * 1962-12-04 1969-03-27 Itt Ind Gmbh Deutsche Schleifscheibe mit Verstaerkungsgeflecht
DE1502644A1 (de) * 1964-02-10 1969-10-30 Norton Co Verfahren und Vorrichtung zur Herstellung von armierten Schleifscheiben
DE7240816U (de) * 1972-11-07 1973-03-15 Winter E & Sohn Kreissägeblatt mit einem ringförmigen Diamantschleifbelag
DE2719741A1 (de) * 1977-05-03 1978-11-09 Geb Riemer Elfriede Peltz Schleifscheibe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123948A (en) * 1964-03-10 Reinforced
US3262230A (en) * 1964-02-10 1966-07-26 Norton Co Reinforcement of molded abrasive articles
US3487590A (en) * 1967-02-02 1970-01-06 Itt Reinforced grinding wheel
EP0083380A1 (fr) * 1981-12-30 1983-07-13 Sankyo Diamond Industrial Co., Ltd. Scie diamentée

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006042352A1 (fr) 2004-10-19 2006-04-27 Gerhard Gissing Anneau de tronçonneuse à double dispositif de serrage médian
US8113920B2 (en) 2004-10-19 2012-02-14 Gerhard Gissing Cut-off wheel comprising a double core clamping device
CN104440622A (zh) * 2014-12-04 2015-03-25 张和庆 砂轮生产芯环分拣抓取装置

Also Published As

Publication number Publication date
ZA94753B (en) 1994-09-29
EP0832720A3 (fr) 2000-12-13
DE59407464D1 (de) 1999-01-28
DE4311529A1 (de) 1994-08-18

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