EP2785495A1 - Outil de rectification et son procédé deproduction - Google Patents

Outil de rectification et son procédé deproduction

Info

Publication number
EP2785495A1
EP2785495A1 EP12816639.4A EP12816639A EP2785495A1 EP 2785495 A1 EP2785495 A1 EP 2785495A1 EP 12816639 A EP12816639 A EP 12816639A EP 2785495 A1 EP2785495 A1 EP 2785495A1
Authority
EP
European Patent Office
Prior art keywords
wear
grinding tool
particle
matrix
promoting
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.)
Granted
Application number
EP12816639.4A
Other languages
German (de)
English (en)
Other versions
EP2785495B1 (fr
Inventor
Franz Egger
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
Publication of EP2785495A1 publication Critical patent/EP2785495A1/fr
Application granted granted Critical
Publication of EP2785495B1 publication Critical patent/EP2785495B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
    • 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
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
    • 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
    • B24D18/0054—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by impressing abrasive powder in a matrix
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/346—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties utilised during polishing, or grinding operation
    • 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
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • 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
    • B24D5/12—Cut-off wheels
    • B24D5/123—Cut-off wheels having different cutting segments
    • 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

Definitions

  • the invention relates to a grinding tool, in particular a cutting disk, with a matrix, in particular with a sintered metal matrix, and diamonds embedded in the matrix. Furthermore, a method for producing the grinding tool according to the invention is to be specified.
  • Such grinding tools are state of the art and are described, for example, in AT 506 578 B1.
  • the abrasive action of these tools is based on the diamonds sticking out of the matrix a little and in contact with the object to be ground.
  • the abrasive effect can be adversely affected essentially by two effects: First, it can lead to premature breaking out of the diamond from the matrix. On the other hand, the effect was observed that the areas - viewed in the direction of grinding - "clog up" in front of the diamonds during the grinding process and thus the possibility of intervention of the diamonds is lost.
  • the object of the present invention is to avoid these disadvantages and to provide a comparison with the prior art improved grinding tool of the type mentioned, and a method for producing the same, wherein the grinding tool according to the invention is characterized in particular by an improved grinding action and increased life.
  • At least the majority of the diamonds are each assigned at least one wear-promoting particle and / or at least one wear-inhibiting particle, wherein the at least one wear-promoting particle or the at least one wear-inhibiting particle is likewise embedded in the matrix.
  • the grinding tool has a preferred grinding direction, it is advantageous if in each case the at least one wear-promoting particle is embedded in the matrix in the direction of the grinding in front of the diamond assigned to it, or if in each case the at least one wear-inhibiting particle behind the grinding direction Diamonds, which it is assigned, embedded in the matrix.
  • the at least one wear-promoting particle then ensures that the region of the bond of the diamond in the matrix-seen in the grinding direction of the grinding tool-wears out sufficiently in front of the diamond, thus preserving the possibility of engagement of the diamond.
  • the at least one wear-inhibiting particle in each case causes the wear of the rear region, seen in the grinding direction of the grinding tool, to reduce the binding of the diamond in the matrix and thereby prevent premature break-out of the diamond from the matrix.
  • the described effect of the respective at least one wear-promoting particle or of the at least one wear-inhibiting particle can furthermore be increased by the fact that the at least one wear-promoting particle has a smaller distance from the grinding contact surface of the grinding tool than the diamond to which it is assigned , or in each case the at least one wear-resistant particles with respect to the diamond to which it is associated, has a greater distance from the sliding contact surface.
  • the at least one wear-promoting particle initially comes into contact with the object to be ground, thereby breaks out and releases the diamond arranged slightly below. If this diamond is additionally assigned a wear-inhibiting particle which is arranged somewhat below the diamond, then this anti-wear particle causes a stabilization of the bond of the diamond in the matrix.
  • the at least one wear-promoting particle at least partially, preferably entirely, from pre-sintered granules, preferably from a binder phase and embedded Mölybdändisulfid and / or graphite powder exists.
  • the binder phase may consist at least partially, preferably entirely, of copper, cobalt, iron, bronze or nickel.
  • the at least one wear-promoting particle consists at least partially, preferably entirely, of glass spheres, mineral granules (ceramics or ceramic fracture) or mineral fracture (eg soapstone, limestone, chamotte, silicates, carbonates, nitrides, sulfides).
  • the at least one wear-inhibiting particle is preferably at least partially, preferably entirely, of hard metal grit, corundum, silicon carbide and / or boron nitride.
  • the at least one wear-promoting particle and / or the at least one wear-inhibiting particle has a particle size between 250 ⁇ m and 600 ⁇ m. It is thus slightly smaller than the preferred grain size of diamonds from 350 pm to 700 pm.
  • the grinding tool comprises at least one grinding segment, wherein the at least one grinding segment is arranged on at least one carrier body, preferably made of steel.
  • the at least one abrasive segment can be attached to the at least one carrier body, e.g. welded or soldered.
  • Protection is also desired for a method for producing the grinding tool according to the invention, the method being characterized in that
  • a matrix layer is formed from a pulverulent, sinterable material
  • diamonds are placed in a predetermined setting pattern on the matrix layer,
  • At least one wear-promoting particle and / or at least one wear-inhibiting particle is placed on the matrix layer at a predetermined distance relative to at least the majority of the diamonds
  • a fourth process step the matrix layer which is provided with the diamonds and the respectively at least one wear-promoting particle or the respectively at least one wear-resistant particle is pressed, and - In a final process step, a sintering process is performed.
  • recesses for receiving the diamonds and / or the respectively at least one wear-promoting particle or the respectively at least one wear-inhibiting particle are formed in the matrix layer.
  • Fig. 1 is a schematically illustrated plan view of a preferred embodiment
  • Fig. 2a is a schematically illustrated plan view of a first preferred embodiment
  • Fig. 4 is a schematically illustrated plan view of a third preferred embodiment
  • FIG. 5 is a schematically illustrated plan view of a fourth preferred embodiment
  • Fig. 6 is a schematically illustrated flowchart for illustrating a
  • FIGS. 7a-7d show a schematically illustrated sequence of two method steps
  • Particles are placed on a matrix layer.
  • Fig. 1 shows a preferred embodiment of a grinding tool 1 according to the invention in the form of a cutting disc.
  • This is generally a circular, flat disc, which is usually used as part of an angle or cutting grinder for workpiece machining.
  • cutting discs are also used in wall and floor cutting machines.
  • a distinction is made between different types of cutting discs, which in the case shown is a so-called diamond cutting disc, which is used in particular for the processing of natural stone, concrete or asphalt.
  • the cutting disc 1 consists of a support body 7 in the form of a steel disc (disc blade), on the outer circumference of a series of abrasive segments 6 are arranged. The abrasive segments 6 are welded to the outer edge 11 of the carrier body 7.
  • the support body 7 further comprises receiving or mounting holes 10 for installation of the cutting wheel 1 in an angle or cut grinder or in a wall or joint cutting machine.
  • the individual abrasive segments 6 are separated by slots 12.
  • the blade 1 is rotated, wherein the blade 1 has a preferred grinding direction D.
  • Cutting discs are usually used for separating material sections and therefore have a very narrow sliding contact surface S, which extends over the end face of the cutting wheel 1.
  • abrasive segments 6 is shown enlarged in a first preferred embodiment.
  • the basic component of the grinding segment 6 is a sintered metal matrix 2, in which a plurality of diamonds 3 are embedded.
  • the Diamonds 3 have a grain size K d of 350 pm to 700 pm.
  • the distance between the centers of the diamonds 3 is 1 to 2 mm.
  • the majority of the diamonds 3 are each assigned a wear-promoting particle 4, the wear-promoting particles 4 being embedded in the matrix 2 before the diamonds 3, as seen in the grinding direction D.
  • they have a smaller distance A f to the sliding contact surface S with respect to the diamonds 3 to which they are associated.
  • the grain size K f of the wear-promoting particles 4 is 250 ⁇ m to 600 ⁇ m. It should also be pointed out that individual diamonds 3, in particular in the edge region of the grinding segment 6, are each assigned no wear-promoting particle 4. The distance of the center point of the diamonds 3 to the center of the respectively assigned wear-promoting particles 4 corresponds approximately to the grain size K f of the wear-promoting particles 4th
  • FIG. 2b schematically shows a perspective view of the grinding segment 6 from FIG. 2a.
  • the abrasive segment 6 in this case consists of four layers 2 ', which are arranged one above the other and constructed in much the same way as the upper layer facing the observer.
  • the layer structure is indicated by the three dashed dividing lines.
  • the width of the grinding segment 6 is provided with the reference symbol b.
  • FIGS. 3, 4 and 5 show three further preferred embodiments of the grinding segment 6.
  • the embodiment to be seen in FIG. 3 is characterized in that the plurality of diamonds 3 are each assigned two wear-promoting particles 4. In this way, the wear-promoting effect of these particles 4 (see introduction to the description) is increased even further.
  • each of the two wear-promoting particles 4 - seen in the grinding direction D of the grinding tool - are embedded in the matrix 2 in front of the diamond to which they are associated, and that one of the two particles 4 opposite the diamond 3 a smaller distance A f to the sliding contact surface S and the other of the two particles 4 has a greater distance A f to the sliding contact surface S.
  • the exemplary embodiment shown in FIG. 4 is characterized in that the diamonds 3 are each assigned a wear-inhibiting particle 5, wherein these wear-inhibiting particles 5 each - seen in the grinding direction D - behind the diamond 3, which they are assigned, in the matrix. 2 are embedded. In addition, they have a greater distance A h to the sliding contact surface S with respect to the diamonds to which they are associated.
  • the grain size K h of the wear-inhibiting particles 5 is in turn between 250 ⁇ and 600 pm.
  • the fourth exemplary embodiment of the grinding segment 6, which can be seen in FIG. 5, is finally characterized in that the plurality of diamonds 3 are each assigned at least one wear-promoting particle 4 and a wear-inhibiting particle 5, wherein the wear-promoting particle 4 in each case in the grinding direction D before Diamonds 3, with which it is associated, is embedded in the matrix 2 and the wear-inhibiting particles 5 are each embedded in the matrix 2 in the grinding direction D behind the diamond 3 to which it is associated.
  • a matrix layer of a pulverulent, sinterable material is formed.
  • diamonds are placed in a predetermined setting pattern on the matrix layer.
  • at least one wear-promoting particle and / or at least one wear-inhibiting particle are placed on the matrix layer at a predetermined distance relative to at least the majority of the diamonds.
  • the matrix layer provided with the diamonds and the respectively at least one wear-promoting particle or the respectively at least one wear-resistant particle is pressed and finally sintered in a concluding process step v.
  • further matrix layers are successively applied before the concluding process step v, and in each case the second, third and fourth process steps ii, iii and iv repeatedly until a predetermined width b is reached (see also Fig. 2b).
  • recesses for receiving the diamonds and the respective at least one wear-promoting particle or the respectively at least one wear-inhibiting particle are formed in the matrix layer.
  • the matrix layer is formed by first pouring the powder-form sinterable material into a segment mold via a portioning device. After pouring, the surface is scraped to obtain a flat surface. Subsequently, the metal powder layer is slightly pressed. In the course of this pressing, the recesses for receiving the diamonds and the respectively at least one wear-promoting particle or each a wear-inhibiting particle in the matrix layer are formed at the same time, said recesses being e.g. have the shape of conical or truncated pyramids.
  • the diamonds and the wear-promoting particles or the wear-inhibiting particles are easily pressed into the metal powder when placed on the matrix layer.
  • the second and third method steps ii and iii are also carried out simultaneously.
  • preference is given to using either two different setting devices, one for the diamonds and the other for the wear-promoting and / or wear-inhibiting particles, or there is only a single setting device which can handle both the diamonds and the wear-promoting and / or or in the latter case, the setting of the diamonds and the wear-promoting and / or wear-inhibiting particles is carried out successively or simultaneously.
  • FIGS. 7a to 7d schematically show an exemplary implementation of the second and the third method step. Not shown is the preceding first method step, in which the metal matrix layer 2 is formed and then recesses 8 and 9 are formed for receiving the diamonds 3 and their associated wear-promoting particles 4.
  • the illustrated setting device 13 is substantially a perforated plate 14 which is provided with holes 15, wherein the bores 15 are penetrated by pins 17 which are connected to a die plate 16.
  • a negative pressure is generated, which propagates to the mouths of the bores 15, so that there each one diamond 3, a wear-promoting particle 4 or a wear-inhibiting particles 5 (not shown) can be recorded.
  • the perforated plate 14 is moved so close to the metal powder layer 2, that there is still no suction of powder.
  • the diamonds 3, the wear-promoting particles 4 or the wear-inhibiting particles 5 were simply dropped from the height thus caused, the diamonds 3, the wear-promoting particles 4 or the wear-inhibiting particles 5 would not be uniform 3, the wear-promoting particles 4 and the wear-inhibiting particles 5 are ejected by moving the die plate 14 in a suitable guide 18 by means of the pins 17. In the illustrated setting device 13, the diamonds 3, the wear-promoting particles 4 or the wear-inhibiting particles 5 are therefore not pressed into the metal powder, as may also be provided (see above).
  • the diamonds 3 and the wear-promoting particles 4 are provided Metal powder layer 2 pressed, if necessary, another Metal powder layer 2 applied and the second, third and fourth process step is repeated and finally completed the grinding segment in a sintering process.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Abstract

Outil de rectification (1), notamment meule de tronçonnage, comportant une matrice (2), notamment une matrice métallique frittée, ainsi que des diamants (3) incorporés dans la matrice (2). Au moins une particule favorisant l'usure (4) et/ou au moins une particule empêchant l'usure (5) sont respectivement associées à au moins la majorité des diamants (3). Ladite au moins une particule favorisant l'usure (4) ou ladite au moins une particule empêchant l'usure (5) est également incorporée dans la matrice (2).
EP12816639.4A 2011-12-01 2012-11-28 Outil de rectification et son procédé deproduction Active EP2785495B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA1778/2011A AT511967B1 (de) 2011-12-01 2011-12-01 Schleifwerkzeug sowie verfahren zur herstellung desselben
PCT/AT2012/000299 WO2013078487A1 (fr) 2011-12-01 2012-11-28 Outil de rectification et son procédé de production

Publications (2)

Publication Number Publication Date
EP2785495A1 true EP2785495A1 (fr) 2014-10-08
EP2785495B1 EP2785495B1 (fr) 2019-05-01

Family

ID=47598532

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12816639.4A Active EP2785495B1 (fr) 2011-12-01 2012-11-28 Outil de rectification et son procédé deproduction

Country Status (5)

Country Link
US (2) US9579774B2 (fr)
EP (1) EP2785495B1 (fr)
AT (1) AT511967B1 (fr)
AU (1) AU2012344710B2 (fr)
WO (1) WO2013078487A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019117796A1 (de) * 2019-07-02 2021-01-07 WIKUS-Sägenfabrik Wilhelm H. Kullmann GmbH & Co. KG Zerspanungswerkzeug mit Pufferpartikeln
AT522810B1 (de) * 2019-07-16 2023-02-15 Tyrolit Schleifmittelwerke Swarovski Kg Schleifsegment für eine Schleifwalze
KR102182704B1 (ko) * 2019-12-31 2020-11-25 주식회사 르본인터내셔널 정밀하고 신속한 래핑이 가능한 래핑방법

Family Cites Families (17)

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Publication number Priority date Publication date Assignee Title
ZA721535B (en) * 1971-03-15 1972-11-29 Norton Co Grinding wheels
IT961770B (it) * 1971-08-03 1973-12-10 Winter & Sohn Ernst Mola con un legante per i corpi abrasivi
DE2138679A1 (de) * 1971-08-03 1973-02-15 Winter & Sohn Ernst Schleifscheibe mit einer bindung fuer die schleifkoerper
US5049165B1 (en) * 1989-01-30 1995-09-26 Ultimate Abrasive Syst Inc Composite material
US5427987A (en) * 1993-05-10 1995-06-27 Kennametal Inc. Group IVB boride based cutting tools for machining group IVB based materials
US5846269A (en) * 1996-08-07 1998-12-08 Norton Company Wear resistant bond for an abrasive tool
US6039641A (en) * 1997-04-04 2000-03-21 Sung; Chien-Min Brazed diamond tools by infiltration
WO1999008837A1 (fr) * 1997-08-15 1999-02-25 Struers A/S Produit abrasif et procede de meulage
DE29920212U1 (de) * 1999-11-17 2000-02-17 Henn Kurt Werkzeug für die Steinbearbeitung
JP3739304B2 (ja) * 2001-07-26 2006-01-25 株式会社ノリタケスーパーアブレーシブ 回転円盤砥石
KR100428947B1 (ko) 2001-09-28 2004-04-29 이화다이아몬드공업 주식회사 다이아몬드 공구
KR100531499B1 (ko) * 2002-02-08 2005-11-28 이화다이아몬드공업 주식회사 다이아몬드 공구용 절삭팁 및 다이아몬드 공구
KR100597717B1 (ko) * 2005-02-15 2006-07-10 이화다이아몬드공업 주식회사 다이아몬드 공구
WO2010031089A1 (fr) * 2008-09-19 2010-03-25 Tyrolit Schleifmittelwerke Swarovski K.G. Procédé de production d'un outil de rectification
AT506578B1 (de) 2008-09-19 2009-10-15 Swarovski Tyrolit Schleif Verfahren zur herstellung eines schleifwerkzeuges
WO2010075091A2 (fr) * 2008-12-15 2010-07-01 Saint-Gobain Abrasives, Inc. Article abrasif aggloméré et procédé d'utilisation
US9259855B2 (en) * 2011-07-13 2016-02-16 Tae Ung Um Diamond tool

Also Published As

Publication number Publication date
AT511967A4 (de) 2013-04-15
US20170120421A1 (en) 2017-05-04
AU2012344710A1 (en) 2014-06-26
US9751191B2 (en) 2017-09-05
US9579774B2 (en) 2017-02-28
EP2785495B1 (fr) 2019-05-01
AU2012344710B2 (en) 2016-02-25
US20140273778A1 (en) 2014-09-18
WO2013078487A1 (fr) 2013-06-06
AT511967B1 (de) 2013-04-15

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