US3885358A - Abrasive tool and methods of producing same - Google Patents

Abrasive tool and methods of producing same Download PDF

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Publication number
US3885358A
US3885358A US443538A US44353874A US3885358A US 3885358 A US3885358 A US 3885358A US 443538 A US443538 A US 443538A US 44353874 A US44353874 A US 44353874A US 3885358 A US3885358 A US 3885358A
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US
United States
Prior art keywords
abrasive
brush
brush bristles
mass
bristles
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
US443538A
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English (en)
Inventor
Edwin Enzian
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.)
Stemcor Corp
Original Assignee
Carborundum 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
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Publication of US3885358A publication Critical patent/US3885358A/en
Assigned to KENNECOTT CORPORATION reassignment KENNECOTT CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 31, 1980 NORTH DAKOTA Assignors: BEAR CREEK MINING COMPANY, BEAR TOOTH MINING COMPANY, CARBORUNDUM COMPANY THE, CHASE BRASS & COPPER CO. INCORPORATED, KENNECOTT EXPLORATION, INC., KENNECOTT REFINING CORPORATION, KENNECOTT SALES CORPORATION, OZARK LEAD COMPANY, PLAMBEAU MINING CORPORATION, RIDGE MINING CORPORATION (ALL MERGED INTO)
Assigned to STEMCOR CORPORATION, 200 PUBLIC SQUARE, CLEVELAND, OHIO 44114 A DE. CORP. reassignment STEMCOR CORPORATION, 200 PUBLIC SQUARE, CLEVELAND, OHIO 44114 A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KENNECOTT MINING CORPORATION
Assigned to KENNECOTT MINING CORPORATION reassignment KENNECOTT MINING CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 31, 1986. (SEE DOCUMENT FOR DETAILS) Assignors: KENNECOTT CORPORATION
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
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes

Definitions

  • An abrasive wire brush tool is provided with an embedded mass which surrounds the bases of the brush bristles of the abrasive tool, but leaves free ends of the brush bristles to which abrasive grains are bonded.
  • the tool is well suited for polishing operations or for aftergrinding operations on manually manipulated workpieces of complex shape, especially plastic or wood workpieces.
  • This invention relates to an abrasive brush tool and methods for producing such an abrasive brush tool.
  • this invention relates to an abrasive brush tool of high sharpness and of a high dimensional accuracy and of a high resistance to clogging by abraded material, as well as to different methods for the production of such an abrasive tool.
  • Wood, plastic and various metallic materials are difficult to machine with solid grinding wheels, because of clogging.
  • the use of coated abrasive belts brings about difficulties in some situations, in particular in those cases where a high abrasion rate is desired, only one pass of the material is to be made, and close tolerances are to be maintained. Since the sharpness of the grain on the belt deteriorates, current control of the dimensional stability and frequent adjustment of the tool are required.
  • Solid foam grinding wheels have been proposed, but they wear very quickly.
  • the present invention provides an abrasive brush tool, comprising (a) a plurality of brush bristles; (b) an embedded mass surrounding the bases of the brush bristles, but leaving free ends of the brush bristles non-embedded; and (c) abrasive grain bonded to the free, non-embedded ends of the brush bristles.
  • FIG. 1 is a plan view of an abrasive brush tool in accordance with the present invention
  • FIG. 2 is a sectional view of the abrasive brush tool of FIG. 1, taken along line 2-2 of FIG. 1;
  • FIG. 3 is a broken away view on an enlarged scale in the region of the abrasive surface of the abrasive brush tool indicated by the letter A in FIG. 1;
  • FIG. 4 is an illustration of the same broken away portion as in FIG. 3, but illustrating a further embodiment of the abrasive brush tool.
  • the abrasive brush tool of the present invention is preferably in the form of a circular (disc-shaped) brush for rotary abrasive use, the abrasive grain being arranged on the circumference of the circular brush.
  • the wire bristles have a diameter ranging from about 0.3 to about 0.5 millimeters, and the diameter of the abrasive grain is about one-tenth of the diameter of the brush bristles.
  • Preferred grains for application to the free nonembedded ends of the brush bristles include boron carbide, silicon carbide and diamond.
  • the bond can be effected by an electrolytical precipitation.
  • electrolytical precipitation it is feasible not only to precipitate a metallic bond, but also a cured resin (plastic) bond, by electrophoretic precipitation, which is known per se.
  • the abrasive brush tool has a diamond abrasive grain bonded with a metallic bond.
  • the bristles are to good advantage embedded in foamed elastic material which is electrically non-conductive and indifferent to galvanic baths, the wire ends projecting from the mass. It has proven appropriate to have the wire ends project from the mass by 0.1 to 2.0 millimeters, in particular 0.2 to 0.5 millimeters.
  • the embedding mass is polyurethane, i.e. an isocyanatc resin formed by the reaction of a polyisocyanate, usually a diisocyanate, with a polyether or polyester.
  • a metallic coating is arranged between the free nonembedded ends of the brush bristles and the abrasive grain.
  • This metallic coating preferably has a head-like form.
  • the abrasive brush tool of the invention can be made in a variety of different manners.
  • the brush bristles are introduced into the embedding mass, whereby to form a blank body, as illustrated in FIGS. 1 and 2, i.e., a plurality of brush bristles in an embedding mass surrounding the bases of the brush bristles, but not having free nonembedded ends of the brush bristles.
  • a layer of material is next ground off the surface of the blank body, whereby to expose the ends of the brush bristles, and a metallic coating is galvanically applied to the ends of the brush bristles exposed by the grinding operation.
  • the metallic coating applied to the exposed end of the brush bristles is next lightly ground, and abrasive grain is applied galvanically to the lightly ground coating.
  • an elastic material is used for the embedding mass.
  • the blank body is rotated at a rotational speed sufficient to stretch the embedding mass in the direction of the embedded brush bristles.
  • a layer of the blank body is then ground off, whereby to expose the ends of the brush bristles and remove a portion of the embedding mass, while the blank body is being rotated. Rotation of the blank body is then discontinued, whereby to allow a relaxation and shrinking of the elastic material in a direction away from the free nonembedded ends of the brush bristles.
  • the embedding mass is stretched in an outward radial direction, and relaxed in an inward radial direction.
  • an appropriate arrangement can be made so that the stretching and relaxation occur in the proper directions.
  • abrasive grain is applied to the projecting free nonembedded ends of the brush bristles. As indicated above, this can be either by metallic bonding or by means of a cured resin.
  • the circumferential speed employed for radial stretching is preferably sufficient to cause a centrifugal force five times higher than that developed during ordinary operational speeds.
  • An advantage of this method of production of abrasive brush tools is that it permits production of slightly contoured wheels which are particularly suited for a later use for contour grinding, by the use of a contoured tool to cut both the brush bristles and the embedding mass in the same desired shape.
  • Another preferred method for the production of an abrasive brush tool in accordance with this invention comprises placing the brush bristles so as to intrude into a melted mass in a mold, cooling and solidifying the melted mass within the mold containing the intruding brush bristles, and filling the remaining space in the mold with plastic to form the embedding mass.
  • wax or paraffins are acceptable as melted masses, as they may be removed by heating again.
  • the wire ends intrude into the melt mass from about 1 to about 2 millimeters.
  • the abrasive brush tool is in the form of a circular brush for rotary abrasive use
  • the placement of the brush bristles so as to intrude into a melted mass in a mold is preferably accomplished by centrifuging.
  • the brush bristles are denominated l, the embedding mass 2, the free nonembedded ends of the brush bristles (or simple wire ends) 3, and the abrasive grain particles which are bonded to the free, nonembedded ends of the brush bristles 4.
  • FIGS. 1 and 2 show the circular brush in its unfinished state, although the brush circumference has already been ground circular. Electrically nonconductive material which is indifferent to galvanic baths may be used for the embedding mass 2, so that a coating by a galvanic procedure may be effected only on the ends 3 of the brush bristles.
  • Foam embedding masses, in particularly based on polyurethane, are particularly well suited for use in the present invention.
  • FIG. 3 shows a broken away view on an enlarged scale in the region of the abrasive surface of the abrasive brush tool indicated by the letter A in FIG. 1.
  • FIG. 3 only the righthand part of the figure diagrammatically shows the final state of the abrasive tool
  • head-like elements are built up on the ground off or slightly ground wire cross sections by a galvanic coating, which elements 5 represent and extension of the bursh bristles 1, beyond the circumference of the embedding mass 2. These elements 5 must again be ground to define a circular path of rotation, as indicated by reference 6, so that the application of abrasive grain 4 in the galvanic bath is affected uniformly and circularly. In the galvanic bath, the abrasive particles 4 are applied in a metallic bond to elements 5 in the required precision and strength.
  • a particular advantage of the embodiment illustrated in FIG. 4 is the high self-cleaning effect of this abrasive tool.
  • the reason for this may be considered to be that the abrasive surface has certain resiliency.
  • the ends of the brush bristles 3 are more or less elastically clamped into the embedding mass 2.
  • a pressure is exerted on the wire ends 3, and a certain recoiling is thereby caused.
  • the wire ends 3 spring forward again and thus perform a relative movement regarding the tool upon each revolution, i.e., the wire ends oscillate or constantly swing. This causes a self-cleaning effect.
  • the use of a scraper support is recommended.
  • scraper supports are well-known in the prior art. They are among other embodiments known in the form of thick adhesive fabrics through which the wire scrapers are past from rearwardly. Such tools are, for instance, known as roughening tools in the shoemaker art.
  • a solution proposed is to join such a conventional scraper support, possibly by a helical winding and a firm bonding by means of an adhesive, to a metal roll. The scrapers may then be provided with an abrasive grain coating, in the manner described above.
  • the abrasive tool of this invention is well suited for polishing operations or for aftergrinding operations on manually manipulating workpieces of the most complex shape.
  • the particularly cool abrasion of metallic bond with a weak application and also for a grain too fine for the abrasive use up to now, satisfactory results can be obtained by increasing the pressure engagement, without a burning" being noted at the workpiece.
  • the abrasive tool of this invention is to be considered a tool dressed dull, in this greatly reduces the risks of injuries in practice when manipulating the tool manually. lnjuries by touching open abrasive belts are inevitable in practice, and are particularly painful.
  • the abrasive tool of this invention therefore is of particular interest for the wood processing industries, since it does not bring about even visible traces in cases of contact with pressure engagement.
  • a further advantage in the use will be noted in the sharpening of paper webs which are readily prone to burning. Proper and dimensionally true grinding operations have been achieved there with the abrasive tool of this invention.
  • An abrasive brush tool comprising:
  • An abrasive brush tool in the form of a circular brush for rotary abrasive use, the abrasive grain being arranged on the circumference of the circular brush.
  • An abrasive brush tool according to claim 1, wherein the abrasive grains are bonded to the free nonembedded ends of the brush bristles by means of cured resin.
  • An abrasive brush tool according to claim 1, wherein the abrasive grains are bonded to the free nonembedded ends of the brush bristles by means of metallic bonding.
  • An abrasive brush tool according to claim 10, wherein the brush bristles are provided with metallic coating between the free nonembedded ends of the brush bristles and the abrasive grain.
  • An abrasive brush tool according to claim 1, wherein the grain is selected from the group consisting of boron carbide, silicon carbide and diamond abrasive grain.
  • a process for producing the abrasive brush tool of claim 1, comprising the steps of a. introducing the brush bristles into the embedding mass, whereby to form a blank body;
  • a process for producing an abrasive brush tool according to claim 1, comprising the steps of a. introducing the brush bristles into an embedded mass, the embedded mass being elastic material, whereby to form a blank body;
  • abrasive brush tool is in the form of a circular brush for rotary abrasive use, and the placement of the brush bristles so as to intrude into a melted mass in a mold is accomplished by centrifuging.
  • a process according to claim 17, comprising in addition the step of exposing the free nonembedded ends of the brush bristles to solvent to free the ends of the brush bristles of adhering residue of the cooled so-

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US443538A 1973-02-20 1974-02-19 Abrasive tool and methods of producing same Expired - Lifetime US3885358A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2308258A DE2308258C3 (de) 1973-02-20 1973-02-20 Verfahren zum Herstellen eines rotierenden Schleifwerkzeugs

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US3885358A true US3885358A (en) 1975-05-27

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CA (1) CA1004856A (de)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5211725A (en) * 1991-08-12 1993-05-18 Fowlie Robert G Method for manufacturing abrasively-tipped flexible bristles, and flexible abrasive hones therefrom
US5226929A (en) * 1991-05-15 1993-07-13 Sumitomo Chemical Company, Ltd. Abrasive brush
US5772055A (en) * 1996-11-18 1998-06-30 The Croydon Company, Inc. Rotatable display tower
US20100255765A1 (en) * 2007-12-12 2010-10-07 Serafino Ghinelli Abrasive tool
US20210323112A1 (en) * 2020-04-15 2021-10-21 Nantong Jinchang Machinery Manufacturing Co., Ltd. Derusting machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8614687U1 (de) * 1986-05-30 1987-10-29 KADIA Maschinenbau Kopp GmbH & Co, 7440 Nürtingen Werkzeug zur Beseitigung der Blechmantelbildung gehonter zylindrischer Bohrungen
SE501993C2 (sv) * 1992-01-29 1995-07-10 Sjoedin Sven Eric Roterande verktyg innefattande ett roterbart lagrat nav omkring vars omkrets ett antal bearbetningsspetsar är anordnade

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608034A (en) * 1951-08-10 1952-08-26 Howard A Fromson Abrasive wire brush for internal grinding and cutting
US3105988A (en) * 1953-07-13 1963-10-08 Osborn Mfg Co Brush construction
US3122766A (en) * 1953-07-13 1964-03-03 Osborn Mfg Co Brush construction
US3142081A (en) * 1962-11-21 1964-07-28 Gen Tire & Rubber Co Polyurethane reinforced brush
US3233271A (en) * 1964-02-27 1966-02-08 Osborn Mfg Co Self-regulating composite brushing tool
US3384915A (en) * 1967-06-30 1968-05-28 Brush Res Mfg Co Multiple-compliant-bristle brush means having enlarged, abrasively coated outer bristle tip ends of multi-phase material
US3529945A (en) * 1959-08-18 1970-09-22 Sherwin Williams Co Rotary brushing tool containing nonwoven fibrous material
US3577839A (en) * 1968-06-27 1971-05-11 Sherwin Williams Co Brush and brush material

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2608034A (en) * 1951-08-10 1952-08-26 Howard A Fromson Abrasive wire brush for internal grinding and cutting
US3105988A (en) * 1953-07-13 1963-10-08 Osborn Mfg Co Brush construction
US3122766A (en) * 1953-07-13 1964-03-03 Osborn Mfg Co Brush construction
US3529945A (en) * 1959-08-18 1970-09-22 Sherwin Williams Co Rotary brushing tool containing nonwoven fibrous material
US3142081A (en) * 1962-11-21 1964-07-28 Gen Tire & Rubber Co Polyurethane reinforced brush
US3233271A (en) * 1964-02-27 1966-02-08 Osborn Mfg Co Self-regulating composite brushing tool
US3384915A (en) * 1967-06-30 1968-05-28 Brush Res Mfg Co Multiple-compliant-bristle brush means having enlarged, abrasively coated outer bristle tip ends of multi-phase material
US3577839A (en) * 1968-06-27 1971-05-11 Sherwin Williams Co Brush and brush material

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226929A (en) * 1991-05-15 1993-07-13 Sumitomo Chemical Company, Ltd. Abrasive brush
US5211725A (en) * 1991-08-12 1993-05-18 Fowlie Robert G Method for manufacturing abrasively-tipped flexible bristles, and flexible abrasive hones therefrom
US5772055A (en) * 1996-11-18 1998-06-30 The Croydon Company, Inc. Rotatable display tower
US20100255765A1 (en) * 2007-12-12 2010-10-07 Serafino Ghinelli Abrasive tool
US8393941B2 (en) * 2007-12-12 2013-03-12 Serafino Ghonelli Abrasive tool
US20210323112A1 (en) * 2020-04-15 2021-10-21 Nantong Jinchang Machinery Manufacturing Co., Ltd. Derusting machine
US11801581B2 (en) * 2020-04-15 2023-10-31 Nantong Jinchang Machinery Manufacturing Co., Ltd. Derusting machine

Also Published As

Publication number Publication date
CA1004856A (en) 1977-02-08
DE2308258C3 (de) 1980-04-24
DE2308258B2 (de) 1976-12-16
DE2308258A1 (de) 1974-09-05

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AS Assignment

Owner name: KENNECOTT CORPORATION

Free format text: MERGER;ASSIGNORS:BEAR CREEK MINING COMPANY;BEAR TOOTH MINING COMPANY;CARBORUNDUM COMPANY THE;AND OTHERS;REEL/FRAME:003961/0672

Effective date: 19801230

AS Assignment

Owner name: KENNECOTT MINING CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:KENNECOTT CORPORATION;REEL/FRAME:004815/0036

Effective date: 19870220

Owner name: STEMCOR CORPORATION, 200 PUBLIC SQUARE, CLEVELAND,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KENNECOTT MINING CORPORATION;REEL/FRAME:004815/0091

Effective date: 19870320