EP3046729B1 - Harzgebundene schleifscheibe - Google Patents

Harzgebundene schleifscheibe Download PDF

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Publication number
EP3046729B1
EP3046729B1 EP14766728.1A EP14766728A EP3046729B1 EP 3046729 B1 EP3046729 B1 EP 3046729B1 EP 14766728 A EP14766728 A EP 14766728A EP 3046729 B1 EP3046729 B1 EP 3046729B1
Authority
EP
European Patent Office
Prior art keywords
fabric
grinding disk
reinforcing fabric
roughing
disc
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.)
Not-in-force
Application number
EP14766728.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3046729A1 (de
Inventor
Gunnar BÜHLER
Martin E. Davies
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.)
Rhodius Schleifwerkzeuge GmbH and Co KG
Original Assignee
Rhodius Schleifwerkzeuge 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 Rhodius Schleifwerkzeuge GmbH and Co KG filed Critical Rhodius Schleifwerkzeuge GmbH and Co KG
Priority to SI201430624T priority Critical patent/SI3046729T1/en
Priority to PL14766728T priority patent/PL3046729T3/pl
Publication of EP3046729A1 publication Critical patent/EP3046729A1/de
Application granted granted Critical
Publication of EP3046729B1 publication Critical patent/EP3046729B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B37/00—Lapping machines or devices; Accessories
    • B24B37/11—Lapping tools
    • B24B37/20—Lapping pads for working plane surfaces
    • B24B37/24—Lapping pads for working plane surfaces characterised by the composition or properties of the pad materials
    • 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
    • B24D5/02—Wheels in one piece
    • B24D5/04—Wheels in one piece with reinforcing means
    • 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
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B24D7/04—Wheels in one piece with reinforcing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/18—Wheels of special form

Definitions

  • the invention relates to a resin-bonded cranked grinding disk, according to the preamble of claim 1, such as from WO2013 / 163305 A1 known.
  • Resin-bonded grinding wheels are used for cutting (cutting) or roughing (roughing) machining of workpieces. They consist inter alia of a resin-reinforcing fabric composite in which abrasive grains are incorporated, the abrasive grains cause the exciting lifting of the material from the workpiece. With the roughing discs a surface machining of the workpiece is possible. Due to the higher lateral load on the surfaces, the material of roughing discs is stronger than that of cutting discs. In addition, roughing discs are always cranked to further increase the stability. On the other hand, cutting discs are relatively thin in order to be able to ensure the narrowest possible cuts.
  • a main task of the reinforcement fabric is to ensure the stability and, not least, the safety of the grinding wheel.
  • Safety is particularly important for hand-operated machines because, unlike stationary machines, the operator is inevitably in the immediate vicinity of the grinding wheel during machining. Furthermore, it is always to be expected by the manual guide with a non-optimal guidance of the machine. Thus, side forces can arise suddenly, which must withstand the rather narrow cutting disc.
  • the reinforcing fabric is relatively expensive. It is therefore an object of the present invention to provide an improved resin-bonded grinding disc, which is cheaper to produce.
  • the object of the invention is achieved by a roughing disc according to claim 1.
  • the essence of the invention lies in the fact that the roughing disc according to the invention now has as little as possible reinforcing fabric, one of which on the top and one on the underside of the grinding wheel.
  • Each reinforcement fabric initially serves to support the torque input from the clamping flange into the roughing disc. It is essential that each reinforcing fabric protrudes into the region of the roughing disc on which the clamping takes place with the clamping flange. For the forwarding of the torque up to the radially outer regions of the roughing disc, on which the machining usually takes place, it is then sufficient that only a single reinforcing fabric supports the passage of the torque there. A second reinforcement fabric is there largely unnecessary and can be saved.
  • the minimum requirement for the reinforcing fabric results: twice reinforcing fabric radially inside, once reinforcing fabric radially outside.
  • up to about 35% of the reinforcing fabric can be saved, which means a considerable cost savings potential.
  • such disks are also included, in which the base area of the first reinforcement fabric, in particular due to production, is slightly smaller than the nominal diameter of the disk.
  • the first reinforcing fabric It is essential for the first reinforcing fabric that it essentially reinforces the entire surface of the disk, so that the radially outer regions are also stabilized accordingly. In particular, in the case of the roughing discs, it has been found that they crumble away in the edge region if at least one layer of reinforcing fabric is not provided there, at least over the entire surface.
  • the first Arm istsgewebe has in particular a circular shape.
  • the second reinforcing fabric must be arranged only in the radially inner region. A circular form is not important here; Rather, other forms are conceivable.
  • the second Reinforcing fabrics can be chosen for shapes that enable jam-free production, such as rectangular shapes or interlocking shapes, such as star or triangular shapes.
  • a diameter of the first reinforcing fabric may correspond to the nominal diameter of the grinding wheel.
  • a diameter of the second reinforcement fabric is significantly smaller than the nominal diameter of the abrasive wheel, in particular at least 10%, preferably at least 20% or 40% smaller than the nominal diameter.
  • the base area of the second reinforcement fabric is preferably also significantly smaller, preferably at least 15%, in particular at least 20% or at least 50% smaller than the base area of the grinding wheel.
  • the grinding wheel comprises as reinforcing fabric only the first and the second reinforcing fabric.
  • this arrangement is sufficient.
  • the amount of reinforcing fabric to be used here is significantly reduced to previous solutions, with at least single-layer full-surface coverage of the grinding wheel. This option is applicable to cut-off wheels and roughing wheels, in particular to roughing wheels if they have a maximum thickness of 10 mm.
  • the first reinforcing fabric that is to say that with the large surface
  • the second reinforcing fabric ie the one with the smaller area
  • the reinforcing fabric is obstructive in schruppenden contact with the workpiece rather.
  • the reinforcement fabric does not disturb the roughing process.
  • FIG. 1 a known hand-held machine tool in the form of an angle grinder 1 is shown.
  • This comprises a housing 2 with handles 6, 7, on which an operator leads the angle grinder 1 during a work operation with both hands.
  • the angle grinder 1 further has a drive shaft 3, which is mounted in the housing 2.
  • On the drive shaft 3 is a grinding wheel, in the present case a Cutting disc 9 'attached, the use of a roughing disc is also possible.
  • a power line 8 of the angle grinder 1 receives electrical energy.
  • such a machine tool can also be driven by other sources of energy, for example pneumatically or hydraulically.
  • the term housing is to be understood widely and may also include internal support structures of the machine tool.
  • the upper side 17 that axial side of the grinding wheel 9 which faces the machine tool is referred to as the upper side 17.
  • the other side is the underside 18.
  • the underside is the side with which the disc is in rough contact with the workpiece to be machined.
  • FIG. 2 shows an inventive arrangement with a machine tool, for example, the angle grinder after FIG. 1 , As well as a grinding wheel according to the invention in the form of a cutting disc 9 '.
  • the cutting disc 9 ' is frictionally secured by means of a clamping flange 4 to the drive shaft 3 of the angle grinder 1.
  • a drive torque is thus introduced from the drive shaft 3 into the cutting disk 9', which is to be transferred to the entire cutting disk 9 'and, in particular, to be guided radially outward.
  • the central that is to say radially inner region 19, in operation there are consequently large stresses within the cutting disk 9 'which must be distributed over the entire cutting disk 9'.
  • the first reinforcing fabric 11 is circular and has a diameter D1 which corresponds to a nominal diameter N of the cutting disk 9 '.
  • the base of the first Arm istsgewebes 11 also corresponds to the base of the blade 9 '.
  • the second reinforcing fabric 12 is formed smaller in diameter and has a diameter D2 of only 55% of the nominal diameter N of the substantially Cutting disc 9 '.
  • the second reinforcing fabric 12 has essentially the task of basically supporting the transmission of the torque from the clamping flange 4 in different areas of the disc. For the further distribution of the torque in the peripheral region, however, it has proved to be sufficient that this is supported only by a reinforcing fabric, namely the first reinforcing fabric.
  • the advantage over conventional resin-bonded cutting discs is now in the material savings, since only a large layer and a small layer of reinforcing fabric is to be used instead of two large layers of reinforcing fabric.
  • the reduction to only one reinforcing fabric, which extends to the outer periphery, also has the following advantage.
  • the reinforcement fabric can bring stability in the disc, but it has no abrasive effect.
  • the robustness of the reinforcing fabric can have an adverse effect on the separating process, for example, the movement of the disc is slowed down by the tissue. This basically also applies to roughing. Due to the reduction in the size of the second disk, only one reinforcing fabric is present on the outer circumference, which can then "disturb" the actual separating process.
  • the thickness B of the cutting disc is about 2 mm and is suitable for producing quite thin cuts.
  • FIG. 3 shows an alternative embodiment, wherein instead of the cutting disc 9 'now a cranked grinding disc 9 "is mounted on the angle grinder 1.
  • two reinforcing fabrics 11, 12 are present, wherein the first reinforcing fabric 11 corresponds to the base of the roughing wheel 9 ", while the second reinforcing fabric 12 has a significantly smaller base area, in which case the underside 18, which is in contact with a workpiece to be machined, is in contact is provided with the smaller second reinforcing cloth 12.
  • the second reinforcing cloth 12 is provided exclusively in the radially inner portion 19 in which the roughing disc 9 "is cranked, and thus does not protrude into the plane E of the working surface.
  • the reinforcing fabric is a hindrance during the roughing process and should therefore not come into contact with the workpiece.
  • the thickness B of the scrubbing wheel 9 " is approximately 8mm.
  • FIG. 4 shows a development of the embodiment FIG. 3 ,
  • a third reinforcing fabric is disposed between the first and second reinforcing fabrics 11, 12.
  • This third reinforcement fabric 13 also has a significantly smaller base area than the base area of the roughing wheel; the third reinforcing fabric 13 is furthermore provided exclusively in the radial inner region 19 in which the roughing disc 9 "is cranked, so that even with partially worn-out roughing disc 9" the reinforcing fabric does not project into the then displaced plane E of the processing surface.
  • the thickness B of the roughing disc 9 " is about 9 mm.
  • FIG. 5 are presented, not to conclude, different possible geometries, wherein the fabric shapes of the first and second reinforcing fabrics are shown superimposed. This representation applies to both the cutting discs and the grinding discs. Should a roughing disc be provided with an additional third reinforcing fabric, then it is preferable for the shape of the third reinforcing fabric as shown in FIGS FIGS. 5a-d for the second, that is smaller reinforcement fabric 12 is shown.
  • FIG. 5a shows the first reinforcement fabric and the second reinforcement fabric substantially as shown in FIG. 2 and 3 , In both Arm michsgeweben 11, 12, a mounting recess 5 is provided, through which the drive shaft 3 is inserted through during assembly.
  • Both the first reinforcing fabric 11 and the second reinforcing fabric 12 is circular.
  • the second reinforcing fabric 12 has a smaller diameter D2 than the diameter D1 of the first Arm michsgewebes 11 and thus a smaller footprint.
  • FIG. 5b an alternative form is shown.
  • the second reinforcing fabric 12 is formed by a rectangle, in the present case a square.
  • the rectangular shape has the advantage that the corresponding reinforcement fabric can be produced without any rejects. In contrast, rejects are inevitably generated in the production of circular reinforcing fabrics.
  • Other examples are in the FIGS. 5c and 5d shown where the second reinforcing fabric is formed as a triangle or a star, which can each be made without jetting. It can therefore be seen that polyhedral shapes are particularly suitable for the reject-free production of the reinforcing fabric.
  • first reinforcing fabric 11 is always circular and substantially covers the entire pane.
  • FIG. 6 the manufacturing process is explained. It is based essentially on the usual method for the production of resin-bonded grinding wheels, such as the German patent application 10 2011 109 536 underlying. Successively, the second reinforcing fabric 12, the mixture 10 and the first reinforcing fabric 11 are introduced into a mold 14. Subsequently, a lid is placed. The assembly is then pressed by means of a pressing force F. In conventional wafers, however, the second reinforcement fabric 12 completely covers the bottom of the die 14, which is no longer possible with the second reinforcement fabric 12 reduced according to the invention. So there is the danger that the mixture 10 can get directly to the bottom of the mold 14 and can stick with the mold. A removal of the finished pressed disc is then difficult or impossible.
  • a surface layer 16 is placed under the second reinforcing fabric 12 in the mold, which is a barrier to the mixture 10 opposite the bottom of the mold 14.
  • the surface layer has a diameter corresponding to the nominal diameter N of the disk.
  • the surface layer 16 may be formed from a fabric, for example a paper or textile fabric.
  • a third reinforcing fabric 13 can additionally be inserted into the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP14766728.1A 2013-09-17 2014-09-17 Harzgebundene schleifscheibe Not-in-force EP3046729B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI201430624T SI3046729T1 (en) 2013-09-17 2014-09-17 Resin-bonded grinding disc
PL14766728T PL3046729T3 (pl) 2013-09-17 2014-09-17 Tarcza szlifierska związana żywicą

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013110237.9A DE102013110237A1 (de) 2013-09-17 2013-09-17 Harzgebundene Trennscheibe
PCT/EP2014/069835 WO2015040083A1 (de) 2013-09-17 2014-09-17 Harzgebundene schleifscheibe

Publications (2)

Publication Number Publication Date
EP3046729A1 EP3046729A1 (de) 2016-07-27
EP3046729B1 true EP3046729B1 (de) 2017-12-06

Family

ID=51564664

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14766728.1A Not-in-force EP3046729B1 (de) 2013-09-17 2014-09-17 Harzgebundene schleifscheibe

Country Status (9)

Country Link
US (1) US20160229024A1 (zh)
EP (1) EP3046729B1 (zh)
CN (1) CN105592984A (zh)
DE (1) DE102013110237A1 (zh)
ES (1) ES2660568T3 (zh)
HU (1) HUE036683T2 (zh)
PL (1) PL3046729T3 (zh)
SI (1) SI3046729T1 (zh)
WO (1) WO2015040083A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018102754U1 (de) 2018-05-17 2018-05-28 Robert Bosch Gmbh Trennscheibe

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016103580A1 (de) 2016-02-29 2016-05-19 MÜLLER Maschinen und Anlagen GmbH & Co. KG Vorrichtung zur Herstellung einer Schleif- und/oder Trennscheibe und Verfahren zur Verteilung eines streu- oder rieselfähigen Materials in einer Werkzeugform
EP3421178A1 (en) * 2017-06-26 2019-01-02 Dronco GmbH Method of manufacturing an abrasive member, in particular rotary abrasive disc and abrasive member, in particular rotary abrasive disc
DE102018109528A1 (de) 2018-04-20 2019-10-24 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Abrasive Scheibe für handgeführte Werkzeugmaschinen mit unterschiedlichen Arbeitsbereichen
US20220088747A1 (en) * 2019-01-14 2022-03-24 Pferd Milwaukee Brush Company, Inc. Grinding disc and use of such a grinding disc

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USRE24548E (en) * 1958-10-07 Cut-off wheel
US2540112A (en) * 1949-12-29 1951-02-06 Carborundum Co Abrasive wheel
US2694886A (en) * 1952-07-12 1954-11-23 Allison Company Abrasive cutting wheel
US3121981A (en) * 1960-09-23 1964-02-25 Rexall Drug Chemical Abrasive wheels and method of making the same
US3477180A (en) * 1965-06-14 1969-11-11 Norton Co Reinforced grinding wheels and reinforcement network therefor
US3487589A (en) * 1967-01-30 1970-01-06 Federal Mogul Corp Cutoff wheel
US3838543A (en) * 1970-05-25 1974-10-01 Norton Co High speed cut-off wheel
US3685215A (en) * 1970-12-04 1972-08-22 Pacific Grinding Wheel Co Inc Reinforced grinding wheel
US3828485A (en) * 1971-10-12 1974-08-13 Clure C Mc Reinforced abrasive wheels
US3716950A (en) * 1971-10-12 1973-02-20 C Mcclure Reinforced abrasive wheels
US3867795A (en) * 1973-10-16 1975-02-25 Norton Co Composite resinoid bonded abrasive wheels
BR9706508A (pt) * 1997-12-30 1999-10-26 Norton Ind E Comercio Ltda Tela de fibra de vidro resinada para reforço de um disco abrasivo de desbaste e/ou de corte e/ou rebolo resinóide e disco abrasivo incluindo tal tela.
TW550141B (en) * 1999-07-29 2003-09-01 Saint Gobain Abrasives Inc Depressed center abrasive wheel assembly and abrasive wheel assembly
CN2863361Y (zh) * 2005-11-22 2007-01-31 董瑞平 新型砂轮
CN201164972Y (zh) * 2007-12-24 2008-12-17 郭晓明 增强型玻璃纤维网盖
US8641481B2 (en) * 2008-12-30 2014-02-04 Saint-Gobain Abrasives, Inc. Reinforced bonded abrasive tools
CN101817171B (zh) * 2009-02-27 2015-03-18 圣戈班研发（上海）有限公司 薄型树脂砂轮
DE102011109536A1 (de) 2011-08-05 2013-02-07 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Verfahren zur Herstellung eines harzgebundenen Schleifwerkzeuges
DE102011112412A1 (de) * 2011-09-06 2013-03-07 Rhodius Schleifwerkzeuge Gmbh & Co. Kg Harzgebundene Trennscheibe
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CN103100985A (zh) * 2013-03-01 2013-05-15 福建一胜多砂轮有限公司 超高速纤维增强树脂切割砂轮

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202018102754U1 (de) 2018-05-17 2018-05-28 Robert Bosch Gmbh Trennscheibe

Also Published As

Publication number Publication date
CN105592984A (zh) 2016-05-18
HUE036683T2 (hu) 2018-07-30
SI3046729T1 (en) 2018-05-31
DE102013110237A1 (de) 2015-03-19
WO2015040083A1 (de) 2015-03-26
ES2660568T3 (es) 2018-03-23
EP3046729A1 (de) 2016-07-27
US20160229024A1 (en) 2016-08-11
PL3046729T3 (pl) 2018-06-29

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