US2032484A - Segmental grinding wheel - Google Patents

Segmental grinding wheel Download PDF

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Publication number
US2032484A
US2032484A US26338A US2633835A US2032484A US 2032484 A US2032484 A US 2032484A US 26338 A US26338 A US 26338A US 2633835 A US2633835 A US 2633835A US 2032484 A US2032484 A US 2032484A
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US
United States
Prior art keywords
segments
wheel
grinding
segment
support
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
US26338A
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English (en)
Inventor
George N Jeppson
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
Priority to US26338A priority Critical patent/US2032484A/en
Application granted granted Critical
Publication of US2032484A publication Critical patent/US2032484A/en
Priority to DED72721D priority patent/DE657756C/de
Priority to FR810831D priority patent/FR810831A/fr
Priority to GB16197/36A priority patent/GB468097A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D45/00—Clamping or other pressure-applying devices for securing or retaining closure members
    • B65D45/02—Clamping or other pressure-applying devices for securing or retaining closure members for applying axial pressure to engage closure with sealing surface
    • B65D45/28—Elongated members, e.g. leaf springs, located substantially at right angles to closure axis and acting between the face of the closure and abutments on container
    • 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

Definitions

  • This invention relates to a grinding wheel, and more particularly to a segmental type of grinding wheel especially adapted for grinding logs into wood pulp.
  • a single wedge block is ar- 5 i ranged toA engage clamping faces within reentrant dovetailed portions of two adjacent segments and serves to simultaneously engage and secure both segments to a central iron drum.
  • This method of fastening the segments to a cen- 10 tral rotatable support has not been found entirely satisfactory due to the fact that it hinders uniform lateral expansion of the individual segments when subjected to sudden rises in temperature due to the friction of grinding.
  • This 15 impeding of uniform expansion ofthe segments may be suilicient to cause wheel breakage across the narrow throat of bonded abrasive material which extends between the reentrant dovetailed portions within the opposed faces of each seg- 20 K ment.
  • the segments may be secured in spaced relation on their central support to aid in compensating for lateral expansions thereof oc- 30 casioned by heat of grinding and, if desired, these spaces between the individual segments may be suitably filled with a deformable or compressible material.
  • the primary object of this invention to provide a segmental type of grinding 'videasegmentaltypeofgrinding wheel wherein the maybe uniformly andindividuailysecm'edtoacentralsupportin suchamannerthattheyarefreetoindividually expand and contract under the influence of tem perature changes vand relieve internal wheel stresses dining a grinding operation. thereby and composed of a plurality of bonded abrasive ts rigidly secured to a central rotatable support independently of'each other and in 'such a manner that the segments may individually expand and relieve Ainternal wheel stresses-'during grinding.
  • 'Ihe central rotatable support may be composed ⁇ of any suitable moldable material .which may be cast in position against the bot.-
  • each segment has one ormore anchoring members such as nuts imbedded within its bese portion and adjacent to the central wheel support. These anchoring members are in such spaced relation that they may aid in uniformly securing the segments in grinding position.
  • each anchoring member is connected to a suitable elongated tension member, such as a clamping bolt, which is slidably mounted within but adjustably secured under a predetermined initial tension to a sleeve member imbedded within and integrally secured to the central wheel support.
  • a suitable elongated tension member such as a clamping bolt
  • These anchoring bolts preferably embody elastic properties, so that they may serve to resiliently secure the segments in grinding position on their central support under an initial predetermined but elastic tension to compensate for individual expansions of each wheel segment during a grinding operation.
  • Fig. 1 is a fragmentary sectional view through a portion of my grinding wheel which illustrates my preferred type of segmental wheel construction
  • Fig. 2 is a sectional viewvof a portion of my grinding wheel taken along the line 2--2 of Fig. l;
  • abrasive grains such as crystalline alumina,siliconcarbideorothersuitable granular abrasive material bonded together into the desired sectoror wheel segment shape by a matured bond, suchasavitriiledceramiematerial ofthe nature of porcelainoirglass.
  • the segments are provided with curved outer abrading faces II stantially continuous peripheral grinding wheel face i3, opposed side faces Il, end faces Il, and innersupportingfaces Il whicharearrangedto member or hub Il, and preferably a monolithic center composed of concrete or other cementitious material which may be cast in position.
  • Each nut may be further provided with a knurled or otherwise roughened outer face 25 and the cavities 22 may be provided with sharp reentrant portions, such as grooves 26, in the sides thereof which aid in rigidly and permanently locking the nuts vin their required imbedded positions.
  • one or preferably several clamping members arranged in desired spaced relation may be employed to secure each segment individually to the central support i8.
  • the bottom portions of said crevices adjacent to surfaces I1v may be filled with a moldablematerial, such as putty, or said crevices may becovered by strips of fibrous material, such as paper or Acloth.
  • the interstices between adjacent segmentV faces I4 and between segment faces il may be nues with a deformable material, auth as Babbitt metal, lead, Lavasul", rubber or other suitable compressible materials well known in the art.
  • each segment is arranged to resiliently expandand contract by itself in grinding position and in the event that wheel breakage 'should' occur due to improper wheel use, one or more segments may be individually replaced in the field without necessitating shipping of the entire grinding wheel back to the factory to be completely rebuilt, as has been necessary heretofore.
  • the broken segment may be removed by loosening nuts 36 securing it in position and breaking out the filling material t8 within the crevices between the segments. A new segment may then.
  • a modined form of my invention as shown in Fig. '3 of the drawing, comprises a plurality of separately manufactured bonded abrasive segments B0 of the same general material, shape and size as the segments employed in my preferred type of invention.
  • 'I'hese segments are provided with arcuate outer grinding faces 5I which cooperate with each other in the assembled wheel to form an operative peripheral wheel face 53.
  • the segments are also provided with substantially radial 65 v opposed side faces, end faces 65 and inner supporting faces 51 which are arranged to be firmly seated upon a rotatable central support or hub l! composed of a suitable cementitious material,
  • each segment is provided with one or a plurality of spaced recessed or reentrant cavities l2 within which anchoring members such as nuts 6 3 are imbedded.
  • 'Ihese nuts are permanently and rigidly secured in position within said cavities by a cementitious material 84, such as Babbitt metal, Portland cement, sulphur or other suitable materials which may be cast in position about each nut and i111 the cavities.
  • the nuts are preferably provided with -knurled outer faces l! and the cavities are provided with grooves orreentrant portions in their side faces to aid in securing the cement B4 and nuts 63 integrally to the segments.
  • One or preferably a plurality of these nuts are secured within the bottom of each segment in such spaced relation that each segment may be uniformly secured in position upon the central rotatable support I9.
  • each segment is each secured in position with their respective inner faces l1 seated upon correspondingly shaped faces 10 of the molded central support 59, and these mating faces are preferably made flat to evenly support the segments and aid in imparting rotation thereto.
  • the bottom face of each segment may be. coated with a thin sheet of paper or paint to prevent the cementitious material of the central support 59 from entering the segments and adhering thereto during wheel assembly.
  • each imbedded nut 63 is engaged by an elongated clamping tension member, such as a bolt 14, threaded therein.
  • the outer face of sleeves 1B may be roughened or provided with knurled portions to aid the cementitious material of the central support in securing them in position as integral members therewith.
  • any expansive forces within the grinding wheel during grinding operations such as those normally caused by the heat of grinding, may be compensated for by the elastic properties of bolts 14 which are free to expand and contract within the sleeves 15.
  • the sleeves are made of suitable length and the bolts may be provided with such elastic properties as are necessary to. meet the requirements of each individual wheel.
  • each segment will be individually clamped in position under an initial -tension which may be regulated prior to wheel assembly, but this tension is resisted entirely by the sleeves 1I and is not transmitted to the central wheel support Il, as is the case in prior segmental grinding wheel constructions employing segments clamped to a central support.
  • the lsegments may be located in spaced relation during assembly and, as in my preferred type of invention, the spaces between the adjacent segment faces may be filled with a suitable deformable material to further aid in compensating for lateral expansions of the segments.
  • the nuts 0I are suitably secured within the cavities l2 by means of cementitious material and bolts 14 are firmly screw threaded into the nuts.
  • a sleeve is slid over each of the bolts 14 and a nut 11 is threaded on the protruding end of each bolt and thereafter tightened against the sleeve under a predetermined initial tension.
  • each bolt 14 is secured under a predetermined initial tension before assembly of the grinding wheel. 'Ihe segments are then mounted by means of suitable clamps or guides in the form of an annulus and the cementitious wheel support l!
  • each segment is cast against the bottom faces l1 of each segment and around the sleeves 1l and nuts 11, thereby forming an' integral grindingl unit.
  • the segments may be mounted'in spaced relation to each other and a suitable deformable material cast in the crevices therebetween, as described in my preferred type of invention.
  • a grinding member comprising 'a bonded abrasive block, a support therefor composed of a material molded in situ, an anchoring device including an elongated elastic tension member arranged to secure the abrasive block upon the support, and means embedded within the support which maintains the tension member under an initial predetermined tension, thereby resiliently fastening the abrasive block upon its support and compensating for expansion and ccntraetion within the grinding member.
  • a grinding wheel comprising a plurality of bonded abrasive segments arranged in the form of an annulus. a rotatable central support therefor composed of ay material cast in position against the bottoms of the segments. an anchoring device securing each segment upon the support including an elongated elastic tension member, and means embedded .within the support.
  • a grinding wheel comprising a plurality of bonded abrasive segments arranged in the form' of an annulus having a peripheral grinding face, a rotatable central support therefor composed of a material cast in .position against the abrasive annulus, anchoring devices fastening the segments upon the support, each of said devices including an elongated elastic tension member connectible with a segment. a member embedded within the support which secures the tension member in position but permits slidable movement thereof, and means engageable with the embedded member for securing the tension member under an initial tension, thereby resiliently fastening each segment in grinding position and compensating for expansions within the wheel during grinding.
  • a grinding wheel comprising a plurality of bonded abrasive segments, a rotatable hollow central support therefor. composed of a material molded in situ, anchoring devices securing the segments upon the support.
  • each ci said devices including a sleeve member embedded within the support, an elastic tension member movable within each sleeve, means at one end of each tension member integrally securing it to a ⁇ segment and means at the other end of each tension member arranged td individually and removably secure the segments in positionl under a predetermined but resilient tension to compensate for wheel expansions during grinding.
  • a grinding wheel comprising a plurality of spaced bonded abrasive segments arranged in the form of an abrasive annulus having a substantially continuous grinding face, a rotatable central support therefor composed of a material molded in position against the bottom oi the segments, an anchoring device individually and resiliently fastening each segment upon the support in grinding position which includes an elon-I gated elastic tension member arranged to compensate ior expansion and contraction within the Wheel, means at one end oi said member embedded within the bottom of a segment and integrally secured thereto, and means embedded within the support and engageable with said tension member which permits free expansive and contractive movement thereof and serves to maintain said member under an initial predetermined tension so that the segments may be individually and resiliently secured in position under a predetermined tension.
  • a grinding wheel comprising a plurality o! bonded abrasive segments arranged as an abrasive annulus, a rotatable central support therefor, anchoring devices securing the segments tc the support including elongated elastic tension members which compensate for expansions and contractions withinthe wheel during grinding and means to exert a predetermined initial tension upon each tension member without exerting any clamping force between the segments and their support.
  • a grinding wheel comprising a plurality ot bonded abrasive segments arranged in the form of an abrasive annulus, a rotatable central support therefor composed of a cementitious material cast in position against the bottom of the segments, an anchoring device individually securing each segment to the support including an elongated elastic bolt arranged to expand and contract during grinding and compensate for expansive stresses and strains within the wheel, a sleeve member integrally secured to and embedded within the support which permits a relative slidable movement of the bolt therein, means removably engageable with one end of the bolt embedded within a segment, and means removably engageable with the other end o! said bolt and engageable with said sleeve to resiliently secure each segment in position under a predetermined tension.
  • a grinding wheel comprising a plurality of separately manufactured bonded abrasive segments assembled as an annulus having a cylindrical grinding face, a rotatable central support therefor composed of a material cast in po'sltion against the bottoms of the segments, a plurality of spaced anchoring devices arranged to individually and removably secure each segment upon its central support, each anchoring device including an elongated elastic tension bolt arranged to compensate for individual expansions oi' the segments during grinding, anchoring members embedded within the bottom portion of each segment and removably engageable with said elastic bolts, a rigid sleeve member embedded within and integral with the support.
  • each sleeve engaging an anchoring member andpermitting slidable movement of an elastic bolt therein, and means adjustably and removably engageable with an elastic bolt and sleeve which maintains said bolt under an initial predetermined tension and resiliently but removably secures each segment in position in such a manner that it may be replaced irrespective ci other segments in the wheel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US26338A 1935-06-13 1935-06-13 Segmental grinding wheel Expired - Lifetime US2032484A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US26338A US2032484A (en) 1935-06-13 1935-06-13 Segmental grinding wheel
DED72721D DE657756C (de) 1935-06-13 1936-05-15 Schleiferstein, insbesondere fuer Holzschleifer, mit aus Kunststeinsektoren bestehendem Mantel
FR810831D FR810831A (fr) 1935-06-13 1936-06-09 Meule utilisable notamment pour la production de la pâte de bois
GB16197/36A GB468097A (en) 1935-06-13 1936-06-10 Improvements relating to grinding or abrading wheels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26338A US2032484A (en) 1935-06-13 1935-06-13 Segmental grinding wheel

Publications (1)

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US2032484A true US2032484A (en) 1936-03-03

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US26338A Expired - Lifetime US2032484A (en) 1935-06-13 1935-06-13 Segmental grinding wheel

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US (1) US2032484A (fr)
DE (1) DE657756C (fr)
FR (1) FR810831A (fr)
GB (1) GB468097A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544632A (en) * 1948-02-16 1951-03-06 Norton Co Repair of pulpstones
US2695478A (en) * 1952-12-29 1954-11-30 Norton Co Apparatus and method for grinding
US3310916A (en) * 1964-04-11 1967-03-28 Nussbaum-Christmann Guillermo Composite abrasive grindstones
US20040166791A1 (en) * 2001-03-16 2004-08-26 Olli Tuovinen Grinding segment and grinder stone

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2421885A (en) * 1945-09-18 1947-06-10 Norton Co Pulpstone
US2447943A (en) * 1945-10-30 1948-08-24 Norton Co Pulpstone
FI67240C (fi) * 1983-04-27 1985-02-11 Tampella Oy Ab Arrangemang foer fastsaettning av slipsegment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544632A (en) * 1948-02-16 1951-03-06 Norton Co Repair of pulpstones
US2695478A (en) * 1952-12-29 1954-11-30 Norton Co Apparatus and method for grinding
US3310916A (en) * 1964-04-11 1967-03-28 Nussbaum-Christmann Guillermo Composite abrasive grindstones
US20040166791A1 (en) * 2001-03-16 2004-08-26 Olli Tuovinen Grinding segment and grinder stone
US7086938B2 (en) 2001-03-16 2006-08-08 Metso Paper Inc. Grinding segment and grinder stone

Also Published As

Publication number Publication date
FR810831A (fr) 1937-03-31
GB468097A (en) 1937-06-29
DE657756C (de) 1938-03-12

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