US20130203326A1 - Grinding wheel for longitudinal or transverse grinding - Google Patents

Grinding wheel for longitudinal or transverse grinding Download PDF

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Publication number
US20130203326A1
US20130203326A1 US13/759,193 US201313759193A US2013203326A1 US 20130203326 A1 US20130203326 A1 US 20130203326A1 US 201313759193 A US201313759193 A US 201313759193A US 2013203326 A1 US2013203326 A1 US 2013203326A1
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US
United States
Prior art keywords
grinding
grinding wheel
wheel defined
core part
fibers
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.)
Abandoned
Application number
US13/759,193
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English (en)
Inventor
Egon Evertz
Ralf Evertz
Stefan Evertz
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.)
Egon Evertz KG GmbH and Co
Original Assignee
Egon Evertz KG GmbH and Co
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 Egon Evertz KG GmbH and Co filed Critical Egon Evertz KG GmbH and Co
Assigned to EGON EVERTZ K.G. (GMBH & CO) reassignment EGON EVERTZ K.G. (GMBH & CO) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EVERTZ, EGON, EVERTZ, RALF, EVERTZ, STEFAN
Publication of US20130203326A1 publication Critical patent/US20130203326A1/en
Abandoned 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
    • B24D5/02—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
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/001—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 supporting member
    • 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
    • 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
    • B24D3/344—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 the bonding agent being organic
    • 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
    • B24D5/08—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 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 present invention relates to a grinding disk or wheel. More particularly this invention concerns such a disk or wheel that can grind both longitudinally and transversely.
  • a typical grinding wheel for longitudinal and transverse grinding has an inner core part and an outer annular grinding part that are connected to each other.
  • the grinding part is made of a material that contains a granular abrasive compound.
  • EP 1,129,824 discloses a grinding wheel of this kind.
  • abrasive machining When processing plate slabs in the manufacture of steel, the surfaces undergo abrasive machining to remove any faulty areas such as voids that may be present.
  • a grinding wheel is used to this end containing particles in the abrasive compound thereof in the grinding part.
  • the selection of the abrasive particles depends on the workpiece being machined. In most cases, abrasive particles should be very hard, with sufficient particle toughness and resistance to heat, as well as suitable particle sizes and shapes. Frequently used abrasive particles are made from carborundum (aluminum oxide), silicon carbide, cubic boron nitride or diamond, which grinding materials have been named in the order of ascending hardness.
  • the shape of the abrasive particles as well as the particle sizes thereof depend on the type of machining, namely, whether so-called rough-grinding, pregrinding, finish-grinding or precision-grinding.
  • the grinding wheel is rotated at relatively high speeds of 80 m/s or more. Considerable centrifugal forces are generated at such grinding speeds requiring high-level security measures.
  • the relatively high susceptibility of the grinding wheels to breakage poses a risk for operators, as it can cause single large pieces of the grinding disk or even entire segments of grinding parts to detach.
  • the durability of the grinding wheel is of the utmost importance. In particular, any detachment of individual segments of the grinding part must be effectively avoided.
  • Another object is the provision of such an improved grinding wheel that overcomes the above-given disadvantages, in particular that is very rugged and unlikely to come apart even if rotated at very high speeds.
  • a grinding wheel has according to the invention an inner core part and an outer annular grinding part connected the inner core part.
  • the outer grinding part is made of a granular abrasive medium and plastic or glass fibers.
  • the fibers form between 0.15% and 1%, preferably 0.2% to 0.4%, by weight of the grinding part.
  • glass fibers of a length of 5 mm to 15 mm and a thickness of 0.8 mm to 1.2 mm are used.
  • the grinding wheels according to the invention have, for example, a standardized diameter of 615 mm with a thickness of 79 mm and an inner bore hole in the core part with a diameter of 203 mm.
  • the outer diameter of the core part is 340 mm.
  • the weight of such a grinding wheel, including any embedded iron reinforcement rings, is about 63 kg.
  • the substantially cylindrical outer surface of the core part is formed with individual grooves or singular recesses, and the cylindrical inner surface of the grinding part includes complementary individual ridges or singular bumps.
  • the ridges or singular bumps engage in the grooves or singular recesses of the core part, respectively, to produce an effective “keying” between the core part and the grinding part.
  • the corresponding grooves, recesses or bumps can be easily incorporated during cold shaping.
  • the present invention provides, in principle, for the use of all common grinding materials, preferably Al 2 O 3 , SiC, CBN, ZrO 2 , diamond or mixtures of these material, the maximum particle diameter being no more than 1 mm.
  • the core part and the grinding part have the same thermal coefficients of expansion. If necessary, the coefficients of expansion can deviate by a maximum of 5% from each other. This measure ensures that, when the grinding wheel becomes hot during operation, differential stresses between the core region and the grinding part are for the most part avoided.
  • the core and grinding parts can principally be made of the same or different materials.
  • the grinding part can contain a matrix of metal or a metal alloy or a thermally curable resin in which the granular abrasive medium and the plastic or glass fibers are embedded in a homogenous distribution, at least for the most part homogeneously.
  • the core part can substantially be made of metal and/or metal alloys that have filler materials added thereto, if necessary. In particular, it is possible to use the core part multiple times. Thus after the grinding part is worn out, what is left of the grinding part can be separated from the core part, and a new grinding part can be formed on the core part.
  • the core part (preferably the grinding part as well) can contain a thermally curable resin and a cross-linking agent as well as filler materials.
  • Fillers can be, for example, powdery SiC, Al 2 O 3 , bauxite, graphite or molybdenum sulfide.
  • the core section first, followed by the cutting portion, by cold shaping.
  • the green compact formed in this manner which is made of the core and grinding parts, is already provided with grooves and ridges that engage with each other in the manner following a tongue-and-groove principle (or, in the alternative, singular recesses and singular pegs).
  • the combined compacted green compact is then heated to 180° C. to 200° C. and compacted to the desired final dimensions.
  • the compression pressures are, for example, 7 ⁇ 107 Pa (700 bar).
  • FIG. 1 is a top view of a grinding wheel according to the invention
  • FIG. 2 is a side view of the grinding wheel
  • FIG. 3 is a section taken along line III-III of FIG. 1 .
  • a grinding wheel according to the invention has an inner core part 10 and an outer grinding part 11 , both centered on an axis A.
  • the outer diameter of the grinding part measured diametrally is 615 mm and the axial thickness of the grinding wheel, as seen in FIG. 2 , is 79 mm.
  • Both parts 10 and 11 are, in fact annular, with the grinding part 11 outside the core part 10 so that the cylindrical inner surface of the outer part 11 is in surface contact with and bonded to the cylindrical outer surface of the inner part 10 .
  • a keyed connection can be created between the core part 10 and the grinding part 11 in that the core part 10 is provided with radially outwardly extending circumferential ridges 12 that engage in complementary radially inwardly open annular grooves 13 of the grinding part 11 .
  • Such projections or depressions are formed already at the time of production of the green compact by precompacting, such that the combined body, which is made of the precompacted core part and precompacted grinding part, is placed into a mold and subsequently heated to 180° C. to 200° C., then finally compacted to the above-given final dimensions.
  • the grinding part aside from the matrix material in which are imbedded the abrasive particles made of, for example, aluminum oxide, the grinding part has a mass fraction of 0.15% to 1.0% of plastic or glass fibers 17 .
  • a concrete embodiment provides for the use of about 100 g glass fibers 17 of a mean length of 10 mm and a thickness of 1 mm for the core part 10 and the grinding part 11 .
  • the glass fibers 17 were homogeneously blended.
  • the core part had a total weight of 12 kg, while the grinding part, on the other hand, had a powder weigh-in of 49.5 kg.
  • Two additional iron rings 16 are also embedded in the structure and have a weight of 1.0 kg, resulting in a total weight of 62.5 kg for the grinding wheel.
  • the glass fiber fraction of the weight of the grinding part and the core part was approximately 0.17%, respectively.
  • the grinding wheel was inspected during a test run at rotational speeds of 140 m/sec; chipped spots on larger parts of the grinding part or hair-line fractures that can result in detachments later on were not found. Contrary to grinding wheels without glass fiber content, by the targeted addition of glass fibers 17 it is possible to achieve a considerable improvement in terms of the solidity of the grinding wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US13/759,193 2012-02-06 2013-02-05 Grinding wheel for longitudinal or transverse grinding Abandoned US20130203326A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012002105.4 2012-02-06
DE102012002105A DE102012002105A1 (de) 2012-02-06 2012-02-06 Schleifscheibe, insbesondere zum Längs- oder Querschleifen

Publications (1)

Publication Number Publication Date
US20130203326A1 true US20130203326A1 (en) 2013-08-08

Family

ID=47603294

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/759,193 Abandoned US20130203326A1 (en) 2012-02-06 2013-02-05 Grinding wheel for longitudinal or transverse grinding

Country Status (4)

Country Link
US (1) US20130203326A1 (de)
EP (1) EP2623264B1 (de)
CN (1) CN103240684A (de)
DE (1) DE102012002105A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103770030A (zh) * 2013-12-31 2014-05-07 郑州磨料磨具磨削研究所有限公司 轧辊高速磨削用树脂结合剂超硬材料砂轮及其制备方法
CN105856081A (zh) * 2016-05-16 2016-08-17 郑州磨料磨具磨削研究所有限公司 一种微钻用精磨超硬砂轮及其制备方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107398837A (zh) * 2017-09-19 2017-11-28 广东新吉欣实业有限公司 研磨轮及其制造工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661544A (en) * 1969-11-28 1972-05-09 Bmi Lab Industry A method for making thermosetting resinous abrasive tools
US20070084133A1 (en) * 2005-10-18 2007-04-19 3M Innovative Properties Company Agglomerate abrasive grains and methods of making the same

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3524286A (en) * 1967-04-12 1970-08-18 Carborundum Co Resin bonded abrasive wheels containing fibrous and non-fibrous fillers
DE2342217A1 (de) * 1973-08-21 1975-03-13 Swarovski Tyrolit Schleif Schleifscheibe
CN2033323U (zh) * 1988-05-01 1989-03-01 李芧华 软研磨头
AT396213B (de) * 1990-04-11 1993-07-26 Swarovski Tyrolit Schleif Schleifscheibe
JP3011431B2 (ja) * 1990-05-11 2000-02-21 三和研磨工業株式会社 精密研磨用砥石
US5449388A (en) * 1990-05-21 1995-09-12 Wiand; Ronald C. Injection molded abrasive article and process
JPH08112767A (ja) * 1994-10-18 1996-05-07 Daido Steel Co Ltd 鋼片手入れ用砥石および鋼片手入れ用研削方法
DE19526397A1 (de) * 1995-07-19 1997-01-23 Eisenblaetter Gerd Gmbh Kunststoffaser mit eingearbeitetem Schleifkorn
IL138434A0 (en) * 1998-03-27 2001-10-31 Norton Co Abrasive tools
JP3538360B2 (ja) * 2000-03-02 2004-06-14 株式会社ノリタケカンパニーリミテド 重研削用のレジノイド研削砥石
DE10309021B4 (de) * 2003-02-21 2005-02-24 Schmirgelwerk Chemnitz Gmbh Schleifkörper
EP2384260B1 (de) * 2008-12-30 2018-07-04 Saint-Gobain Abrasives, Inc. Verstärkte werkzeuge mit gebundenen schleifkörpern

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3661544A (en) * 1969-11-28 1972-05-09 Bmi Lab Industry A method for making thermosetting resinous abrasive tools
US20070084133A1 (en) * 2005-10-18 2007-04-19 3M Innovative Properties Company Agglomerate abrasive grains and methods of making the same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103770030A (zh) * 2013-12-31 2014-05-07 郑州磨料磨具磨削研究所有限公司 轧辊高速磨削用树脂结合剂超硬材料砂轮及其制备方法
CN105856081A (zh) * 2016-05-16 2016-08-17 郑州磨料磨具磨削研究所有限公司 一种微钻用精磨超硬砂轮及其制备方法

Also Published As

Publication number Publication date
EP2623264B1 (de) 2021-07-28
EP2623264A3 (de) 2017-08-23
DE102012002105A1 (de) 2013-08-08
CN103240684A (zh) 2013-08-14
EP2623264A2 (de) 2013-08-07

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EGON EVERTZ K.G. (GMBH & CO), GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:EVERTZ, EGON;EVERTZ, RALF;EVERTZ, STEFAN;REEL/FRAME:029822/0288

Effective date: 20130213

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION