EP3278927B1 - Trennscheibe - Google Patents

Trennscheibe Download PDF

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Publication number
EP3278927B1
EP3278927B1 EP17180725.8A EP17180725A EP3278927B1 EP 3278927 B1 EP3278927 B1 EP 3278927B1 EP 17180725 A EP17180725 A EP 17180725A EP 3278927 B1 EP3278927 B1 EP 3278927B1
Authority
EP
European Patent Office
Prior art keywords
cutting disc
mixture
cutting
region
grain
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.)
Active
Application number
EP17180725.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3278927A1 (de
Inventor
Adolf Lang
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.)
Tyrolit-Schleifmittelwerke Swarovski KG
Original Assignee
Tyrolit-Schleifmittelwerke Swarovski 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 Tyrolit-Schleifmittelwerke Swarovski KG filed Critical Tyrolit-Schleifmittelwerke Swarovski KG
Priority to PL17180725T priority Critical patent/PL3278927T3/pl
Priority to SI201730983T priority patent/SI3278927T1/sl
Publication of EP3278927A1 publication Critical patent/EP3278927A1/de
Application granted granted Critical
Publication of EP3278927B1 publication Critical patent/EP3278927B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • B24D5/14—Zonally-graded wheels; Composite wheels comprising different abrasives

Definitions

  • the invention relates to a cutting wheel, in particular for use in the metal-producing industry, with an outer edge, a central hole for connecting the cutting wheel to a rotary drive for rotating the cutting wheel about an axis of rotation running through the central hole and a mixture of abrasive grain, at least one binding agent and optionally fillers , wherein the mixture extends from the outer edge of the cutting disk to the central bore, and wherein the cutting disk has a diameter of 1000 mm to 2000 mm and an average disk thickness.
  • the invention also relates to a method for producing such a cutting disc.
  • Such cutting disks are already known from the prior art and are for example in the EP 1 332 834 A1 described. They are used, for example, in the steel industry to cut slabs.
  • the ratio of diameter to average, i.e. average, slice thickness is approx. 100: 1.
  • the rotary drive of the cutting discs also requires high motor power.
  • a thick cut-off wheel also means high wear and tear on the rotary drive and a large amount of waste after the cut-off wheel is used up.
  • the WO 2013/184873 A1 discloses a cutting tool with a small diameter which should not be larger than 100 cm.
  • the objective technical object of the present invention is to provide a cutting disc in which the disadvantages described are avoided or significantly reduced. Another object is to provide a suitable method for producing such a cutting disc.
  • the cutting disk has a ratio of diameter to average disk thickness of at least 150: 1, preferably from 150: 1 to 250: 1.
  • a ratio of diameter to average disk thickness allows a significant reduction in the average disk thickness while maintaining the same diameter. This results in less waste, lower engine power, less machine wear, less heat input into the workpiece, lower weight of the cutting disc, lower raw material consumption and a reduction in waste after the cutting disc has been used.
  • mixture of abrasive grain does not necessarily mean that it has to be a single type of abrasive grain. Rather, the mixture can also contain several types of abrasive grain, it being possible for the types of abrasive grain to differ in their chemical and / or physical properties. It can also be provided that a first type of abrasive grain is present in the mixture in the region of the central bore and a second type of abrasive grain is present in the remaining part of the cutting wheel.
  • the cutting disk is provided with stabilizing elements, preferably sheet steel, laterally in the area of the central bore.
  • the cutting wheel has a first side surface and an opposing second side surface
  • the axis of rotation of the cutting wheel is aligned essentially normal to the two side surfaces
  • the abrasive grain has a grain size
  • the abrasive grain on the Side surfaces have a protrusion of less than half, preferably less than a third, of the grain size.
  • the cutting wheel thus has very smooth side surfaces compared to the prior art.
  • the side surfaces of a large cutting wheel must have a certain roughness (structure) so that the cutting wheel also has a corresponding grinding performance on the sides and thus grinds itself freely and does not get jammed in the workpiece.
  • very smooth side surfaces in addition to the mentioned lateral stabilization of the cutting disk, lead to an increase in rigidity, reduce the notch effect and thus overall lead to cutting disks that are more resistant to cracking.
  • a fine-grain layer at least in some areas on the two side surfaces.
  • a further measure to increase the lateral stability can be to work layers of fabric into the separating disc, whereby a person skilled in the art has previously assumed that three to four layers of fabric are necessary, whereas the separating disc according to the invention already has one or two layers of fabric, preferably made of glass fibers can cause a significant increase in lateral stabilization.
  • protection is also sought for a method for producing a cutting disc, the invention providing that the mixture of abrasive grain, at least one binder and optionally fillers is applied to a first press plate, covered with a second press plate and applied to the two press plates is compressed, the pressure being exerted on the two press plates in such a way that the abrasive grain has a protrusion of less than half, preferably less than a third, of the grain size on the side surfaces, and / or at least in some areas before the mixture is applied a fine-grain layer is applied to the first press plate and, after the mixture has been applied and before it is covered with the second press plate, a fine-grain layer is applied to the mixture at least in some areas.
  • the press plates it is possible to produce very smooth side surfaces with the advantages described above.
  • the cutting disk 1 shown has an outer edge 2 and a central bore 3 for connecting the cutting disk 1 to a rotary drive for rotating the cutting disk 1 about an axis of rotation 4 running through the central bore 3 (see also the one in FIG Figure 2 shown cross-sectional representation along the cross-sectional plane 24).
  • Clamping flanges 23 may be provided, which are not an integral part of the cutting disc 1.
  • the cutting wheel 1 also has a mixture of abrasive grain 5, at least one binding agent 6 and optionally abrasive fillers, the mixture extending from the outer edge 2 of the cutting wheel 1 to the central bore 3.
  • the cutting disk 1 finally has a diameter 7 of 1000 mm to 2000 mm and an average disk thickness 8.
  • average disk thickness is to be understood as an average disk thickness averaged over the radius. It can namely be provided that the cutting disk 1 runs conically from the central bore 3 to the outer edge 2, that is to say that the thickness of the disk increases from the central bore 3 in the radial direction 18 to the outer edge 2.
  • the disk thickness in the area of the central bore 3 is provided with the reference number 20, the disk thickness at the outer edge 2 with the reference number 21 and the average disk thickness with the reference number 8.
  • FIG 3 shows a cutting disk 1 according to the prior art, this cutting disk 1 having an inner disk thickness 20 of 11 mm, an outer disk thickness 21 of 13 mm and an average disk thickness of 12 mm.
  • this cutting disk 1 according to the prior art has a ratio of diameter 7 to average disk thickness 8 of approximately 100: 1.
  • the cutting disk 1 according to the prior art is made up of four layers 25 which are separated from one another by three layers of fabric 22.
  • a region of the cutting disc 1 is also shown enlarged.
  • the mixture of abrasive grain 5 and a binding agent 6 is schematically indicated.
  • the protrusion 13 of the abrasive grain 5 on the side surfaces 11 and 12 is equal to or greater than half the mean grain size 10 of the abrasive grain 5.
  • the side surfaces 11 and 12 therefore have a relatively high roughness on.
  • the illustrated embodiment of the invention provides that the cutting disk 1 has an inner disk thickness 20 of 7 mm, an outer disk thickness 21 of 9 mm, an average disk thickness 8 of 8 mm and a diameter 7 of 1250 mm. This results in a ratio of diameter 7 to average slice thickness 8 of just over 150: 1.
  • the inner disk thickness 20 is 7 mm, the outer disk thickness 21 9 mm, the average disk thickness 8 8 mm and the diameter 7 2000 mm, which results in an overall ratio of diameter 7 to average slice thickness 8 of 250: 1 results. Any ratio in between can also be achieved by matching the diameter and the mean slice thickness accordingly.
  • the cut-off wheel 1 - as the enlarged section shows - has a protrusion 13 which is reduced compared to the prior art and is less than half, preferably less than a third of the mean grain size 10. This results in very smooth side surfaces 11 and 12.
  • the cutting wheel 1 according to the in Figure 4
  • the exemplary embodiment shown has only two fabric layers 22 which divide the separating disk 1 into three layers 25.
  • a fine-grain layer 14 with a thickness 15 of 5% of the average disk thickness 8 of the cutting wheel 1 is arranged on each of the two side surfaces 11 and 12 equal to 24 mesh, preferably with a grain size 10 of 24 mesh to 46 mesh.
  • the remaining abrasive grain 5 has a grain size 10 of 15 to 20 mesh, preferably it is a 50/50 mixture of grain size 10 of 16 mesh and 20 mesh.
  • the cutting disk 1 has an annular edge region 16 with an increased roughness on the two side surfaces 11 and 12.
  • the fine-grain layers 14 in this case only extend from the central bore 3 to this annular edge area 16.
  • This embodiment ensures that the smooth inner area of the cutting disc 1 can be guided through the material to be cut with little friction and resistance.
  • the outer area 16 with a rough surface ensures a high level of material removal in the cut area and prevents the cutting disks 1 from jamming in the material (free cut).
  • the cutting wheel 1 according to the exemplary embodiments according to the invention have corundum and / or silicon carbide as abrasive grain 5 and / or synthetic resin as binder 6.
  • Figure 9 shows a flow chart to illustrate a preferred exemplary embodiment of the method 19 according to the invention for producing a cutting disk 1:
  • a first method step 26 a first press plate is provided.
  • a fine-grain layer 14 and / or at least one stabilizing element 9 in the form of a steel sheet is optionally applied to this at least in some areas.
  • This optional method step is provided with the reference number 27.
  • Method step 29 is again optional and consists in that, depending on the exemplary embodiment to be produced, a fine-grain layer 14 and / or at least one stabilization element 9 in the form of a steel sheet is applied to the mixture at least in some areas.
  • the cutting disk 1 is hardened at a suitable temperature (method step 32).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP17180725.8A 2016-08-04 2017-07-11 Trennscheibe Active EP3278927B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL17180725T PL3278927T3 (pl) 2016-08-04 2017-07-11 Tarcza tnąca
SI201730983T SI3278927T1 (sl) 2016-08-04 2017-07-11 Rezalni disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ATA50717/2016A AT518913B1 (de) 2016-08-04 2016-08-04 Trennscheibe

Publications (2)

Publication Number Publication Date
EP3278927A1 EP3278927A1 (de) 2018-02-07
EP3278927B1 true EP3278927B1 (de) 2021-09-01

Family

ID=59381059

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17180725.8A Active EP3278927B1 (de) 2016-08-04 2017-07-11 Trennscheibe

Country Status (5)

Country Link
EP (1) EP3278927B1 (es)
AT (1) AT518913B1 (es)
ES (1) ES2899358T3 (es)
PL (1) PL3278927T3 (es)
SI (1) SI3278927T1 (es)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078354A (en) * 1935-04-25 1937-04-27 Norton Co Abrasive article
US2690632A (en) * 1953-09-25 1954-10-05 Allison Company Abrasive cutting wheel
US2814918A (en) * 1956-06-07 1957-12-03 Norton Co Cut-off wheel
US3526999A (en) * 1968-08-08 1970-09-08 Leopold Jagers Cutting blades
US3838543A (en) * 1970-05-25 1974-10-01 Norton Co High speed cut-off wheel
JPH0730279Y2 (ja) * 1987-03-17 1995-07-12 三菱マテリアル株式会社 電鋳薄刃砥石
DE50200094D1 (de) * 2002-01-24 2003-12-11 Swarovski Tyrolit Schleif Trennschleifscheibe mit seitlichen Stahlblechen
DE102004032311A1 (de) * 2004-07-03 2006-01-19 August Rüggeberg Gmbh & Co. Kg Trenn-Schleifscheibe für stationären Einsatz
JP2006082187A (ja) * 2004-09-16 2006-03-30 Mitsubishi Materials Corp 薄刃砥石
EP1976667A1 (de) * 2006-01-24 2008-10-08 Dronco AG Schleif- und/oder trennscheibe, vorrichtung zur herstellung einer schleif- und/oder trennscheibe sowie verfahren zur herstellung einer schleif- und/oder trennscheibe
AR091282A1 (es) * 2012-06-06 2015-01-21 Saint Gobain Abrasives Inc Herramienta de corte de pequeño diametro

Also Published As

Publication number Publication date
SI3278927T1 (sl) 2022-01-31
EP3278927A1 (de) 2018-02-07
AT518913B1 (de) 2019-04-15
AT518913A1 (de) 2018-02-15
PL3278927T3 (pl) 2022-01-17
ES2899358T3 (es) 2022-03-11

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