EP0239918B1 - Grinding wheel - Google Patents

Grinding wheel Download PDF

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Publication number
EP0239918B1
EP0239918B1 EP87104352A EP87104352A EP0239918B1 EP 0239918 B1 EP0239918 B1 EP 0239918B1 EP 87104352 A EP87104352 A EP 87104352A EP 87104352 A EP87104352 A EP 87104352A EP 0239918 B1 EP0239918 B1 EP 0239918B1
Authority
EP
European Patent Office
Prior art keywords
abrasive
core
aluminum
rim
grinding wheel
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
EP87104352A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0239918A2 (en
EP0239918A3 (en
Inventor
Richard H. Sioui
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
Original Assignee
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
Publication of EP0239918A2 publication Critical patent/EP0239918A2/en
Publication of EP0239918A3 publication Critical patent/EP0239918A3/en
Application granted granted Critical
Publication of EP0239918B1 publication Critical patent/EP0239918B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • the invention relates to grinding wheels having a non-abrasive core supporting an abrasive containing rim, in particular, a super abrasive material in which the rim abrasive section contains active filler material and silver powder.
  • Diamond grit or CBN grit containing grinding wheels are customarily made with an abrasive rim section and a supporting core.
  • the core is desireably an organic polymer filled with a metal powder.
  • Aluminum is a particularly desireable filler metal for the core because of its relatively low density, high conductivity, and low cost.
  • U.S. Patent 3,868,233 teaches that such cores may employ aluminum, copper, or a mixture of aluminum and copper as a filler.
  • graphite has been employed to facilitate dressing away of the core material near the abrasive rim in cup-type wheels. Such wheels may employ the graphite additive only in the portion of the core adjacent to the abrasive rim.
  • the use of active fillers in the abrasive rim section became commercially used to improve the grinding of ferrous and other metals.
  • Such fillers which improve the grindability of the metal work piece may also be used in cases where diamond is the abrasive, or where a blend of diamond and CBN is used.
  • Secondary, non premium abrasives may also be used.
  • the diamond and CBN are preferably metal clad. Nickel is a common cladding.
  • the effective solution was found to be a substitution of copper for the aluminum in the core at those portions of the core immediately adjacent the abrasive containing section, while retaining aluminum filler in the major portion of the core.
  • figure 1 shows a straight wheel with a composite core 10 of the aluminum filled resin, with a non-aluminum section 11 adjacent to the abrasive rim 12, and a mounting hole 13.
  • Figure 2 shows a cup-type wheel with an aluminum filled core 20, and non-aluminum filled portion 21, an abrasive rim 22, and a mounting hole 23.
  • Typical molding conditions are 5 tons per square inch pressure, a temperature of 160°C., and a molding time of 20 minutes.
  • the final cure can be carried out in an air atmosphere oven for 24 hours at 175°C.
  • the time and temperature of cure is varied to control the grade of hardness of the wheel depending upon the specific application.
  • Abrasive rims were fabricated containing CBN (cubic boron nitride) abrasive grits, nickel clad, 25% by volume (based on the CBN volume), and mounted on cores of different composition.
  • a suitable formulation for the bond and fillers for the rim is as follows:
  • the mix for the rim sections was prepared by wetting the CBN abrasive grit material with furfural and blending it with the mixture of bond and fillers. The mix was cold pressed to a shape in the recess in the cup, and the whole assembly cured by heat.
  • the core material may also contain graphite and other fillers.
  • a suitable core composition is taught in U.S. Patent 3,868,233.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP87104352A 1986-04-02 1987-03-24 Grinding wheel Expired - Lifetime EP0239918B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84733486A 1986-04-02 1986-04-02
US847334 1986-04-02

Publications (3)

Publication Number Publication Date
EP0239918A2 EP0239918A2 (en) 1987-10-07
EP0239918A3 EP0239918A3 (en) 1990-03-07
EP0239918B1 true EP0239918B1 (en) 1993-01-27

Family

ID=25300367

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104352A Expired - Lifetime EP0239918B1 (en) 1986-04-02 1987-03-24 Grinding wheel

Country Status (6)

Country Link
EP (1) EP0239918B1 (xx)
JP (1) JPH0671706B2 (xx)
BR (1) BR8701479A (xx)
CA (1) CA1324492C (xx)
DE (1) DE3783791T2 (xx)
ZA (1) ZA871902B (xx)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5219463A (en) * 1990-02-13 1993-06-15 Minnesota Mining And Manufacturing Company Abrasives containing ammonium fluoride-based grinding aid
US5110321A (en) * 1990-02-13 1992-05-05 Minnesota Mining And Manufacturing Company Abrasives containing ammonium fluoride-based grinding aid
GB201701246D0 (en) 2017-01-25 2017-03-08 Fives Landis Ltd Machine tools and methods of operation thereof
DE202017004776U1 (de) 2017-09-13 2017-10-10 Prime Supply Inc. Verbessertes Schleifwerkzeug

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4945557B1 (xx) * 1964-08-14 1974-12-04
US3592618A (en) * 1969-03-10 1971-07-13 Avco Corp Abrasive article having a metal filler and an active filler
US3816997A (en) * 1972-03-20 1974-06-18 Itek Corp Apparatus for simultaneously performing rough and fine grinding operations
US3984214A (en) * 1973-03-05 1976-10-05 Federal-Mogul Corporation Metal-coated diamond abrasive article containing metal fillers
JPS55120980A (en) * 1979-03-13 1980-09-17 Toshiba Mach Co Ltd Grinder for vertical-axis plane grinding
JPS5641390A (en) * 1979-09-12 1981-04-18 Masami Fujii Anticorrosion method for earth electrode material of galvanized steel pipe
JPS5893456U (ja) * 1981-12-18 1983-06-24 株式会社東芝 研削砥石

Also Published As

Publication number Publication date
DE3783791T2 (de) 1993-05-19
EP0239918A2 (en) 1987-10-07
DE3783791D1 (de) 1993-03-11
EP0239918A3 (en) 1990-03-07
CA1324492C (en) 1993-11-23
JPH0671706B2 (ja) 1994-09-14
ZA871902B (en) 1987-11-25
JPS62251079A (ja) 1987-10-31
BR8701479A (pt) 1988-01-19

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