US3867795A - Composite resinoid bonded abrasive wheels - Google Patents

Composite resinoid bonded abrasive wheels Download PDF

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Publication number
US3867795A
US3867795A US406918A US40691873A US3867795A US 3867795 A US3867795 A US 3867795A US 406918 A US406918 A US 406918A US 40691873 A US40691873 A US 40691873A US 3867795 A US3867795 A US 3867795A
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US
United States
Prior art keywords
abrasive
wheel
primary
zirconia
alumina
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.)
Expired - Lifetime
Application number
US406918A
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English (en)
Inventor
William C Howard
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.)
Saint Gobain Abrasives Inc
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Norton 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 Norton Co filed Critical Norton Co
Priority to US406918A priority Critical patent/US3867795A/en
Priority to GB44013/74A priority patent/GB1481195A/en
Priority to IT70072/74A priority patent/IT1024576B/it
Priority to BR8629/74A priority patent/BR7408629D0/pt
Priority to DE2449317A priority patent/DE2449317C2/de
Priority to DE19747434685U priority patent/DE7434685U/de
Priority to FR7434748A priority patent/FR2247319B1/fr
Application granted granted Critical
Publication of US3867795A publication Critical patent/US3867795A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/14—Anti-slip materials; Abrasives
    • C09K3/1409—Abrasive particles per se

Definitions

  • ABSTRACT Reinforced resin bonded abrasive depressed and I straight center wheels for portable snagging grinders in which the thickness of each wheel comprises a primary abrading portion containing a superior, expensive, premium, fast cutting and durable cofused alumina-zirconia abrasive particles and an adjoining secondary abrading portioncontaining different, less costly, slower cutting abrasive particles which, it has been discovered, does not materially reduce the grinding performance of the wheel from one made entirely with alumina-zirconia abrasive throughout the thickness of the wheel.
  • the invention relates to resin bonded abrasive grinding wheels and particularly to relatively thin reinforced raised hub or depressed center and straight center snagging wheels for portable grinders.
  • peripheral grinding face or edge of the wheel wears at an angle to the axis of rotation and the opposite sides of the wheel.
  • a sharp and relatively thin fragile peripheral edge is formed at the junction of the grinding face and the back or top sideof the wheel.
  • the fragile edge has a tendency to break away and contributes very little to removing the unwanted material.
  • wheels having various types of backing materials for reinforcing the fragile edge and for supporting the primary cutting or abrading portion of the wheel.
  • abrasive particles of a tough, superior, more durable, faster cutting and more expensive aluminazirconia abrasive material such as disclosed in US. Pat. No. 3,181,939 and a commonly owned prior copending application Ser. No. 386,718 filed Aug. 8, 1973 and to which reference may be had for details not disclosed herein, is used in the primary abrading portion and differs from the abrasive used in the secondary abrading portion of the wheel.
  • US. Pat. No. 3,181,939 discloses rapidly cooled co-fused alumina-zirconia containing 10 to 60% zirconia.
  • the preferred abrasive for this invention is the 35 to 50% zirconia, very rapidly cooled material of Ser. No. 386,718.
  • FIG. 1 is a sectional veiw through the center of a typical depressed center or raised hub wheel made according to the invention
  • FIG. 2 is a sectional view through the center of a straight center wheel made according to the invention.
  • FIG. 3 is a partial sectional view through a peripheral portion of a wheel showing the wheel inclined and the grinding edge thereof worn at an angle during grinding.
  • SUMMARY OF THE INVENTION Depressed and straight center reinforced resin bonded abrasive grinding wheels comprising a primary abrading portion or layer containing tough, durable, fast cutting and relatively expensive bonded aluminazirconia abrasive particles occupying a portion of the thickness of the wheel situated on the working or bottom side of the wheel.
  • a secondary abrading portion or layer containing different, less expensive, less durable abrasive particles is bonded to the primary abrading portion and situated on the back or top sideof the wheel.
  • a backing consisting of at least one layer of reinforcing material molded in and bonded to the back or top side of the secondary abrading portion of the wheel.
  • the reinforced wheel may have one or more additional layers or discs of fiber glass reinforcing material integrally molded and bonded therein.
  • One layer of reinforcement is preferably bonded to and situated in between the secondary and primary abrading layers of the wheel.
  • the central hub portion of the wheel is preferably further reinforced with a disc of fiber glass cloth molded in and bonded to the bottom side of the primary abrading layer or portion.
  • each of the wheels 10 and 10 being substantially the same except for the configuration of the central hub mounting portion around the center mounting hole which may be adapted to receive any suitable mounting, such as shown in FIG. 3, for attaching the wheel to the drive spindle or shaft of a portable grinder.
  • any suitable mounting such as shown in FIG. 3, for attaching the wheel to the drive spindle or shaft of a portable grinder.
  • US. Pat. Nos. 3,081,584; 3,136,100; 3,500,592; and 3,596,415 there are disclosed wheel mountings which may be attached to the wheels disclosed herein and to which reference may be had for details not disclosed herein.
  • there are many other types of suitable mountings known to those skilled in the art which may be attached in various ways to the wheels.
  • the mounting forms no The wheels may be molded by first placing the paper side of the paper stick fiber glass disc 28-of composite backing material with a center hole around the arbor and in contact with the bottom of the mold. Then, spreading a uniform layer of a prepared abrasive mixture containing a suitable resin bond and the secondary abrasive particles on top of the fiber glass backing disc 28. Thereafter, placing the disc 24 of fiber glass reinforcing material with a center hole about the arbor and onto the layer of secondary abrasive mix followed by spreading a uniform layer of a prepared mixture comprising a suitable and compatible resin bond and the primary abrasive containing particles of aluminazirconia abrasive material thereon.
  • the resin bond may comprise any one of a number of the conventional and well known thermosetting or infusible resins, such as, phenol-aldehyde, epoxy, polyester, polyimides, and polybenzimadazole in either liquid for powder form.
  • the resin bond com prises a phenolic (phenol-aldehyde) resin in powder form which is premixed with other fillers and coloring materials and then mixed with predetermined amounts of the secondary and primary abrasive particles.
  • a suitable primary abrasive mixture of primary abrasive particles andresin bond for a snagging operation may comprise the following percentage of ingredients by weight:
  • the secondary abrasive mixture of secondary abrasive and resin bond may comprise the following percentage of ingredients by weight:
  • FIG. 3 there is shown a sectional view through a portion of a grinding wheel of the invention mounted on a shaft and positioned at an angle to the surface of the workpiece W being worked upon to show how in normal use the initial grinding face or edge 16 is worn at an angle to the back or top side 14 and bottom or working side 12. It can be seen that when the wheel is used at an angle that the length of the grinding face 16 is increased and that the thinnest. weakest and most fragile part of the wheel is at and adjacent the outer tip or edge 16a located at the junction of the grinding face 16 and the back side 14. When grinding pressure is applied, the edge 16a and the adjacent tapered portions of the secondary abrading portion have a tendency to break away because they are only supported by the fiber glass backing layer 28.
  • the secondary abrading portion 26 does much less grinding or cutting of unwanted material.
  • the primary abrading portion 20 does not have as fragile an edge or corner as the edge 16a and is more rigidly supported and backed up by the secondary abrading portion of the wheel. Therefore, the primary abrading portion 20 with the more durable faster cutting and more efficient alumina-zirconia abrasive therein does most of the grinding or cutting away of material without the tendency to break away.
  • Wheels 7 inches in diameter, one-quarter of an inch thick each with a seven-eighths inch diameter center hole were made according to the invention with the 24 grit size alumina-zirconia abrasive resin mixtures, and 24 grit aluminum oxide abrasive resin mixtures disclosed above.
  • the wheels were tested and compared with a variety of other wheels all of comparable size and shape, 24 grit size particles and resin bond disclosed above but with variations in the type, amount by volume and location of abrasive particles in the wheel.
  • Some of the wheels were made with aluminum oxide or the alumina-zirconia throughout, with the aluminazirconia abrasive in the secondary portion and alumina in the primary portion, and with a mixture containing by volume 50% of alumina-zirconia and 50% alumina in both portions of the wheel.
  • Another wheel had a mixture containing by volume 75% of alumina-zirconia and 25% garnet in the primary portion and alumina in the secondary portion.
  • the alumina-zirconia abrasive used in all the wheels tested contained about 43% zirconia by weight.
  • the grinding tests were performed by mounting each wheel on an automated apparatus adapted to transverse and manipulate a Chicago Pneumatic 360 cycle right angle portable grinder rotatable at 5,200 RPM and inclined so the bottom side of the wheel was at an angle of 25 from a horizontal plane to simulate the position, applied force and movements ofa hand operated portable grinder.
  • Each wheel tested was run four times during each of which the grinding wheels ground into the annular edge of a 12 inch O.D. X inch 1.D. ring of cast steel, mounted on a reversible rotary table rotated at 15 RPM in reversed directions every one-half minute. Each run lasted for a period of 15 minutes while a constant downward force of pounds was applied to the wheel reciprocated 1% inches across the annular edge. After each run the ring of cast steel was weighed and the wheel measured to determine the number of pounds of metal removed per hour and the number of cubic inches of wheel wear per hour. The grinding ratio" of the wheel isth e ratio of n etal rem oved to wheel wear.
  • RGR refers to the Relative Grinding Ratio" in percent which is determined by dividing the grinding ratio X 100 of the wheel being tested by the grinding ratio of a conventional standard wheel with 24 grit aluminum oxide abrasive perior to the standard wheel with aluminum oxide in both the primary and secondary portions.
  • the wheel having a mixture of one-half alumina-zirconia and one-half(50 aluminum oxide by volume in both the primary and secondary portions gave as expected a 159% RGR and 108% RRC which is an improvement over the standard wheel with aluminum oxide throughout but not equal to the wheel with alumina-zirconia in both portions of the wheel.
  • the wheel of the invention with all of alumina-zirconia in the primary abrading portion of the wheel and aluminum oxide in the secondary portion gave a result of 247% RGR and 97% RRC which is very nearly equal to the wheel with alumina-zirconia throughout the wheel.
  • the wheel with the aluminum oxide in the primary portion and alumina-zirconia in the secondary portion gave a result of 102% RGR and 106% RRC which shows a performance equal to that of the standard wheel with aluminum oxide throughout the wheel.
  • the primary abrading portion may contain a primary abrasive mixture consisting of the superior co-fused primary alumina-zirconia abrasive particles and up to one-fourth or 25% by volume of the primary abrasive particles therein of a different, less costly, less efficient and less durable diluent or filler abrasive particles of material such as, garnet, flint, silica, emery, silicon, carbide, alumina and quartz and mixtures thereof which it hasbeen discovered does not materially reduce the performance of the wheel below one without the 25% of diluent abrasive therein.
  • a primary abrasive mixture consisting of the superior co-fused primary alumina-zirconia abrasive particles and up to one-fourth or 25% by volume of the primary abrasive particles therein of a different, less costly, less efficient and less durable diluent or filler abrasive particles of material such as, garnet,
  • Secondary Abrading Portion 7 by Ingredients Weight Abrasive-24 grit aluminum oxide abrasive 75.62
  • Table I discloses that the wheel with alumina-zirconia abrasive blended with 25% garnet abrasive particles in the primary abrading portion and 24 grit size aluminum oxide in the secondary portion gave a RGR of 193% and RRC of 100% and a performance nearly equal to the wheels with alumina-zirconia in only the primary portion and throughout the wheel.
  • a wheel of comparable size and shape was made according to the invention with finer 46 grit size alumina particles in the secondary portion and with a mixture of alumina-zirconia and 25% garnet in the primary portion.
  • the wheel consisted of the following percentages by weight of ingredients.
  • the grinding'wheel was tested and compared with a comparable standard wheel.
  • the grinding test was performed on the annular edge of a rotating ring of cast steel of the same type, in the same manner and with the same apparatus disclosed above except that the wheel was reciprocated and traversed 3 /sinches across the edge instead of 1 /6 inches disclosed above. Results of the test are shown for comparison in Table 11 below.
  • a reinforced resin bonded abrasivegrinding wheel of predetermined thickness having a relatively. narrow peripheral grinding face usually presented and worn at an angle during grinding, extending between a top and a bottom side, reinforcing material bonded thereto and means for mounting the wheel for rotstion about its axis, wherein the improvement comprises:
  • a primary abrading portion extending along the bottom side to the peripheral grinding face and occupying a portion of the predetermined thickness of the wheel, and having resin bonded primary abrasive particles of co-fused alumina-zirconia abrasive material containing from to 60% by weight of zirconia; and a secondary abrading portion bonded to and extending from the primary abrading portion to the top side and peripheral grinding face of the wheel and h n resin bonded secondary abrasive particles of a secondary abrasive material which differs from and of less durability than the alumina-zirconia abrasive material.
  • resin bonded diluent abrasive particles of an abrasive material selected from a group consisting of garnet, aluminum oxide, silicon carbide, emery, flint, silica, quartz and mixtures thereof mixed in with the alumina-zirconia particles and comprising up to 25% by volume of the abrasive particles in the primary abrading portion.
  • a reinforced resin bonded abrasive grinding wheel according to claim 1 wherein the reinforcing material comprises:
  • a third backing disc of fiber glass cloth bonded to the top side and secondary abrading portion of the wheel.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US406918A 1973-10-16 1973-10-16 Composite resinoid bonded abrasive wheels Expired - Lifetime US3867795A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US406918A US3867795A (en) 1973-10-16 1973-10-16 Composite resinoid bonded abrasive wheels
GB44013/74A GB1481195A (en) 1973-10-16 1974-10-10 Composite resinoid bonded abrasive wheels
IT70072/74A IT1024576B (it) 1973-10-16 1974-10-15 Mola abrasiva rinforzata
BR8629/74A BR7408629D0 (pt) 1973-10-16 1974-10-16 Aperfeicoamento em rebolo reforcado para polimento com abrasivo ligado por resina
DE2449317A DE2449317C2 (de) 1973-10-16 1974-10-16 Harzgebundene Schleifscheibe
DE19747434685U DE7434685U (de) 1973-10-16 1974-10-16 Verstaerkte harzgebundene schleifscheibe
FR7434748A FR2247319B1 (fr) 1973-10-16 1974-10-16

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Application Number Priority Date Filing Date Title
US406918A US3867795A (en) 1973-10-16 1973-10-16 Composite resinoid bonded abrasive wheels

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US3867795A true US3867795A (en) 1975-02-25

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US (1) US3867795A (fr)
BR (1) BR7408629D0 (fr)
DE (2) DE2449317C2 (fr)
FR (1) FR2247319B1 (fr)
GB (1) GB1481195A (fr)
IT (1) IT1024576B (fr)

Cited By (46)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982358A (en) * 1973-10-09 1976-09-28 Heijiro Fukuda Laminated resinoid wheels, method for continuously producing same and apparatus for use in the method
US4021209A (en) * 1975-07-23 1977-05-03 Federal-Mogul Corporation Aramid fiber reinforced abrasive wheel
US4164098A (en) * 1976-09-13 1979-08-14 Hiroshi Akita Grinding wheel
US4350497A (en) * 1980-09-08 1982-09-21 Abraham Ogman Reinforced grinding device
EP0161869A2 (fr) * 1984-05-09 1985-11-21 Minnesota Mining And Manufacturing Company Produit à revêtement abrasif avec substituants minéraux sélectifs
US4734104A (en) * 1984-05-09 1988-03-29 Minnesota Mining And Manufacturing Company Coated abrasive product incorporating selective mineral substitution
US4737163A (en) * 1984-05-09 1988-04-12 Minnesota Mining And Manufacturing Company Coated abrasive product incorporating selective mineral substitution
US4910924A (en) * 1986-12-22 1990-03-27 Norton Company Composite grinding wheel
US4988370A (en) * 1984-05-31 1991-01-29 Minnesota Mining And Manufacturing Company Alumina bonded abrasive for cast iron
AU612996B2 (en) * 1986-12-22 1991-07-25 Norton Company Composite grinding wheel
US5139539A (en) * 1981-12-15 1992-08-18 Minnesota Mining And Manufacturing Company Alumina bonded abrasive for cast iron
US5139536A (en) * 1981-12-15 1992-08-18 Minnesota Mining And Manufacturing Company Alumina bonded abrasive for cast iron
US5431596A (en) * 1993-04-28 1995-07-11 Akita; Hiroshi Grinding wheel and a method for manufacturing the same
US5573453A (en) * 1995-08-21 1996-11-12 B.O.T.S.G., Inc. Fiber reinforced abrasive mold and die finishing tools
US5584755A (en) * 1993-02-15 1996-12-17 August Ruggeberg Abrasive wheel for hand-guided grinding machines, in particular abrasive cutting-off wheel
US5876470A (en) * 1997-08-01 1999-03-02 Minnesota Mining And Manufacturing Company Abrasive articles comprising a blend of abrasive particles
US5928394A (en) * 1997-10-30 1999-07-27 Minnesota Mining And Manufacturing Company Durable abrasive articles with thick abrasive coatings
US6071185A (en) * 1997-10-16 2000-06-06 August Ruggeberg Gmbh & Co. Abrasive wheel
US6685539B1 (en) * 1999-08-24 2004-02-03 Ricoh Company, Ltd. Processing tool, method of producing tool, processing method and processing apparatus
US20040035058A1 (en) * 2002-02-11 2004-02-26 Sakura Color Products Corporation Abrasive solid
US20040242128A1 (en) * 2001-12-13 2004-12-02 Nikon Corporation Grindstone and method for producing optical element
US20050090192A1 (en) * 1999-06-09 2005-04-28 Saint-Gobain Abrasifs Technologie Et Services Method and installation for making abrasive grinders and grinder obtained by said method
US20050107020A1 (en) * 2002-01-24 2005-05-19 Adolf Lang Abrasive cutting disk with lateral steel sheets
US20060286907A1 (en) * 2005-06-20 2006-12-21 Hwang Young M Grinder wheel for liquid crystal display device and method of fabricating liquid crystal display device using the same
US20070173183A1 (en) * 2006-01-25 2007-07-26 Keene Milford M Cutting tool with integrated abrasive trimming elements
US20100022169A1 (en) * 2005-09-26 2010-01-28 Norbert Asen Base for a Rotating Grinding or Cutting Tool, and Grinding or Cutting Tool Produced Therefrom
ITMO20090198A1 (it) * 2009-07-30 2011-01-31 Giovanni Ficai Metodo per la produzione di mole abrasive a centro depresso o piane per molatrici e mola relativa.
US20110027564A1 (en) * 2009-08-03 2011-02-03 Saint-Gobain Abrasives, Inc. Abrasive tool having controlled porosity distribution
CN101691028B (zh) * 2009-09-22 2011-02-09 武汉法山磨料磨具有限公司 兼具切割软硬两类材质功能的树脂砂轮切割片制作方法
US20110041413A1 (en) * 2009-08-03 2011-02-24 Saint-Gobain Abrasives, Inc. Abrasive tool having a particular porosity variation
WO2011068678A1 (fr) 2009-12-03 2011-06-09 3M Innovative Properties Company Procédé de dépôt électrostatique de particules, grains abrasifs et articles associés
US20110212674A1 (en) * 2010-03-01 2011-09-01 Giovanni Ficai Abrasive annular grinding wheel
ES2379424A1 (es) * 2011-11-08 2012-04-26 Salinas E Hijos, S.L. Disco para desbaste de superficies met�?licas.
CN102581778A (zh) * 2012-03-14 2012-07-18 青岛四砂泰益研磨有限公司 一种医用磨针尖砂轮及其制造方法
CN102814767A (zh) * 2012-09-06 2012-12-12 刘凯 一种高速安全砂轮及其制备方法
US20140080392A1 (en) * 2012-09-18 2014-03-20 Ppr Gmbh Abrasive flap disc
US8834618B2 (en) 2009-12-03 2014-09-16 3M Innovative Properties Company Method of inhibiting water adsorption of powder by addition of hydrophobic nanoparticles
US20150079887A1 (en) * 2012-04-26 2015-03-19 Saint-Gobain Abrasifs Tool
EP2994270A1 (fr) * 2013-05-07 2016-03-16 REN S.r.l. Outil abrasif
US9321149B2 (en) 2011-11-09 2016-04-26 3M Innovative Properties Company Composite abrasive wheel
CN105592984A (zh) * 2013-09-17 2016-05-18 罗德斯磨削工具两合公司 树脂粘合的研磨盘
US20160279763A1 (en) * 2013-11-11 2016-09-29 Dipl.-Ing. Günter Wendt GmbH Vulcanized fiber grinding tool
WO2017151498A1 (fr) * 2016-03-03 2017-09-08 3M Innovative Properties Company Roue de meulage à centre renfoncé
CN109277956A (zh) * 2018-11-09 2019-01-29 浙江亚孙砂轮有限公司 一种手持式引擎大直径切割机用高速砂轮及生产工艺
US20200198095A1 (en) * 2017-08-22 2020-06-25 Cibo N.V. Sanding element and method for manufacturing a sanding element
US12122018B2 (en) * 2017-08-22 2024-10-22 Cibo N.V. Sanding element and method for manufacturing a sanding element

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DE3404871A1 (de) * 1983-02-14 1984-08-23 Rands, Mary, Los Angeles, Calif. Schleif-, hon- oder abreibkoerper
JPS59156670A (ja) * 1983-02-22 1984-09-05 ノ−トン　カンパニ− 研削砥石
JP2010052081A (ja) * 2008-08-27 2010-03-11 Fuji Grinding Wheel Mfg Co Ltd 回転砥石の製造方法及び該製造方法によって製造された回転砥石
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
BR112014005361A2 (pt) * 2011-09-07 2017-03-28 3M Innovative Properties Co artigo abrasivo colado
CN110087833A (zh) * 2016-12-22 2019-08-02 3M创新有限公司 具有多种颜色的树脂粘结磨料制品

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US2877105A (en) * 1957-06-27 1959-03-10 Norton Co Vitrified bonded grinding wheel with fine hard sides
US2997820A (en) * 1959-12-14 1961-08-29 American Emery Wheel Works Organic bond abrasive wheel
US3136100A (en) * 1962-07-11 1964-06-09 Norton Co Grinding wheel
US3250045A (en) * 1963-09-26 1966-05-10 Richard T Caserta Grinding wheel
US3576090A (en) * 1967-09-28 1971-04-27 Bendix Corp Abrasive disc and method of making it

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3982358A (en) * 1973-10-09 1976-09-28 Heijiro Fukuda Laminated resinoid wheels, method for continuously producing same and apparatus for use in the method
US4021209A (en) * 1975-07-23 1977-05-03 Federal-Mogul Corporation Aramid fiber reinforced abrasive wheel
US4164098A (en) * 1976-09-13 1979-08-14 Hiroshi Akita Grinding wheel
US4350497A (en) * 1980-09-08 1982-09-21 Abraham Ogman Reinforced grinding device
US5139539A (en) * 1981-12-15 1992-08-18 Minnesota Mining And Manufacturing Company Alumina bonded abrasive for cast iron
US5139536A (en) * 1981-12-15 1992-08-18 Minnesota Mining And Manufacturing Company Alumina bonded abrasive for cast iron
EP0161869A2 (fr) * 1984-05-09 1985-11-21 Minnesota Mining And Manufacturing Company Produit à revêtement abrasif avec substituants minéraux sélectifs
US4737163A (en) * 1984-05-09 1988-04-12 Minnesota Mining And Manufacturing Company Coated abrasive product incorporating selective mineral substitution
US4734104A (en) * 1984-05-09 1988-03-29 Minnesota Mining And Manufacturing Company Coated abrasive product incorporating selective mineral substitution
EP0161869A3 (en) * 1984-05-09 1987-11-25 Minnesota Mining And Manufacturing Company Coated abrasive product incorporating selective mineral substitution
US4988370A (en) * 1984-05-31 1991-01-29 Minnesota Mining And Manufacturing Company Alumina bonded abrasive for cast iron
US4910924A (en) * 1986-12-22 1990-03-27 Norton Company Composite grinding wheel
AU612996B2 (en) * 1986-12-22 1991-07-25 Norton Company Composite grinding wheel
US5584755A (en) * 1993-02-15 1996-12-17 August Ruggeberg Abrasive wheel for hand-guided grinding machines, in particular abrasive cutting-off wheel
US5431596A (en) * 1993-04-28 1995-07-11 Akita; Hiroshi Grinding wheel and a method for manufacturing the same
US5573453A (en) * 1995-08-21 1996-11-12 B.O.T.S.G., Inc. Fiber reinforced abrasive mold and die finishing tools
US5876470A (en) * 1997-08-01 1999-03-02 Minnesota Mining And Manufacturing Company Abrasive articles comprising a blend of abrasive particles
US6071185A (en) * 1997-10-16 2000-06-06 August Ruggeberg Gmbh & Co. Abrasive wheel
US5928394A (en) * 1997-10-30 1999-07-27 Minnesota Mining And Manufacturing Company Durable abrasive articles with thick abrasive coatings
US20050090192A1 (en) * 1999-06-09 2005-04-28 Saint-Gobain Abrasifs Technologie Et Services Method and installation for making abrasive grinders and grinder obtained by said method
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Also Published As

Publication number Publication date
BR7408629D0 (pt) 1975-09-23
DE7434685U (de) 1978-08-24
FR2247319B1 (fr) 1981-04-10
DE2449317A1 (de) 1975-04-17
GB1481195A (en) 1977-07-27
FR2247319A1 (fr) 1975-05-09
IT1024576B (it) 1978-07-20
DE2449317C2 (de) 1983-01-13

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