US3890115A - Backing wheel for a belt grinder - Google Patents

Backing wheel for a belt grinder Download PDF

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Publication number
US3890115A
US3890115A US500024A US50002474A US3890115A US 3890115 A US3890115 A US 3890115A US 500024 A US500024 A US 500024A US 50002474 A US50002474 A US 50002474A US 3890115 A US3890115 A US 3890115A
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US
United States
Prior art keywords
wheel
disks
disk
set forth
belt
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
US500024A
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English (en)
Inventor
Herbert Stahl
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.)
Sm Maschinenfabrik Herbert Stahl
Original Assignee
Sm Maschinenfabrik Herbert Stahl
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Publication date
Application filed by Sm Maschinenfabrik Herbert Stahl filed Critical Sm Maschinenfabrik Herbert Stahl
Application granted granted Critical
Publication of US3890115A publication Critical patent/US3890115A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
    • H01S3/16—Solid materials
    • H01S3/1688—Stoichiometric laser compounds, i.e. in which the active element forms one component of a stoichiometric formula rather than being merely a dopant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B21/00—Machines or devices using grinding or polishing belts; Accessories therefor
    • B24B21/04—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces
    • B24B21/12—Machines or devices using grinding or polishing belts; Accessories therefor for grinding plane surfaces involving a contact wheel or roller pressing the belt against the work
    • B24B21/14—Contact wheels; Contact rollers; Belt supporting rolls

Definitions

  • a laminar backing wheel for the abrasive belt of a belt grinder or polisher has a disk of soft and resilient material compressed to one half or less of its relaxed axial thickness between two disks of stronger and more rigid material by threads stitched axially through the wheel.
  • the tensioned belt rides over the circumferences of the more rigid material.
  • the soft material of the first disk is caused to project beyond the more rigid disks by centrifugal forces and spreads axially into radial alignment with the more rigid disks to provide a soft backing for the belt while deformation of the wheel under starting stresses is resisted by the harder disks.
  • This invention relates to metal shaping apparatus, such as belt grinders and polishers, and particularly to a backing wheel for backing the abrasive belt of such metal shaping apparatus.
  • the backing wheel should be as soft and resilient as possible.
  • the wheel must also transmit driving force to the belt, and the driving force, particularly the force transmitted to the belt during starting of the apparatus would permanently distort a very soft and resilient backing wheel, and the belt may be thrown off the wheel circumference if the latter does not maintain its circular cross section.
  • the primary object of the invention is the provision of a backing wheel for metal shaping apparatus of the type described which is soft and resilient enough during grinding or polishing to conform readily to the contour of a workpiece, yet is hard and rigid enough to with stand deformation under the driving stresses transmitted to the belt, particularly during starting from a standstill.
  • Another object is the provision of a metal shaping apparatus employing the backing wheel of the invention.
  • the invention provides a backing wheel of laminar structure. It includes first, second, and third, substantially circular disks, the first disk being coaxially fastened between the second and third disks under axial compression. Respective circumferential face portions of the second and third disks define a common surface of rotation, usually a cylinder, and the circumferential face portion of the first disk is substantially completely confined within the surface of rotation when the wheel does not rotate.
  • the elastic modulus in tension of the material of the first disk is so much smaller than the corresponding moduli of the second and third disks to cause the circumferential face portion of the first disk to project radially beyond the afore-mentioned common surface under centrifugal forces when the wheel rotates at its normal operating speed.
  • the axial compression of the first disk must be sufficient to cause the radially projecting face portion of the first disk to spread axially into radial alignment with the second and third disks.
  • FIG. 1 is a fragmentary perspective view of a belt grinding machine equipped with a backing wheel of the invention
  • FIG. 2a shows a first wheel of the invention in fragmentary section on its axis of rotation, the wheel being shown in its standing condition;
  • FIG. 2b shows the wheel of FIG. 2a in the condition assumed when rotating at its normal grinding speed
  • FIG. 3a illustrates another wheel of the invention in the manner of FIG. 2a.
  • FIG. 3b shows the wheel of FIG. 3a in its operating condition.
  • FIG. I there is shown as much of an otherwise conventional belt grinding machine using a backing wheel of the invention as is necessary for an understanding of the invention.
  • the horizontal output shaft of an electric motor 2 carries a laminar wheel 4 whose several layers are fastened to each other by a spiral row of quilting stitches 43 terminating at a distance from the circumferential face of the wheel 4.
  • a tensioning pulley 6 is mounted for rotation about an axis parallel to that of the wheel 8 in bearings, not shown, which are resiliently biased away from the wheel 6 so that a desired longitudinal tension is maintained in an abrasive belt 8 trained over the wheel 4 and the pulley 6 and traveling in the direction indicated by an arrow when the motor 2 is energized.
  • a workpiece is normally ground on the illustrated apparatus by holding it against the belt-covered face portion of the wheel 4 indicated by the arrow 10.
  • the backing wheel illustrated in more detail in FIGS. 2a and 2b consists basically of three axially juxtaposed, practically circular disks.
  • the axially central disk 41 consists of foam rubber or of foamed, elastomeric plastic, such as polyurethane.
  • the two axially outer disks 42 consist each of multiple layers of cotton muslin.
  • the three disks are fastened to each other by the textile threads of the stitches 43 which pass axially through the several layers and are so tight that the central elastomer disk 41 is axially compressed between the muslin disks 42. If permitted to relax, the elastomer disk 41 would expand to an axial thickness more than twice its illustrated thickness in the assembled wheel.
  • the outer circumferential faces of the three disks 41, 42 are located in a common, cylindrical surface of rotation about the wheel axis when the wheel 4 does not rotate.
  • the belt 8, under these conditions, directly engages the face portions of the muslin disks 42, and these disks, of a material relatively hard and rigid, are not deformed when the motor 2 is started suddenly and while it accelerates to its normal working speed.
  • the centrifugal forces acting on the central elastomer disk 41 are sufficient to stretch the disk in a radially outward direction so that it projects beyond the circumferential faces of the muslin layers 42 which still define a surface of rotation, not significantly greater in diameter than the circummferential surface of the wheel at rest. Because the material of the elasto mer disc 41 was initially under severe compressive stress between the adjacent faces of the muslin disks 4], its projecting portion 44 spreads axially so that it is radially aligned with the two disks 42. Such spreading is enhanced by the radial pressure exerted by the belt 8.
  • the belt 8 engages only the circumferential face portion 44 of the elastomer disk 41 and is radially separated by the soft, elastomeric material from the harder and more rigid, circumferential faces of the muslin disks 42.
  • the modified backing wheel shown in FIGS. 3a and 3b in the rest condition and at operating speed respectively differs from the first-described backing wheel by having two disks 41 of elastomeric foam material sandwiched between three muslin disks 42, the five layers of the wheel being fastened axially to each other by yarns 43 under sufficient tension to compress the foam disks 4] to about one third of their relaxed axial thickness, as evident from the lateral expansion of the projecting face portions 44 of the elastomeric disks at normal operating speed of the wheel.
  • the radial expansion of the elastomer disks 41 is limited mainly to those circumferential portions of the disks which extend radially beyond the outermost row of stitches 43.
  • the portions of the disks 41 radially inward from the outermost row of stitches contribute little to the expansion, and no significant radially outward movement under centrifugal forces can be observed in those parts of the disks 41 separated from the free circumferential face by two or more rows of stitches.
  • the softness of the backing provided by the wheel 4 to the traveling belt 8 at normal grinding or polishing speed can thus be selected by varying the radial spacing of the outermost stitches 43 from the wheel circumference.
  • Muslin is widely used as a wheel or disk material in this field, but is not the only material which may be used to advantage as the harder or more rigid wheel material. Other materials are suitable if their elastic moduli in tension are much higher than the moduli of foam rubber or foam plastic which are the preferred elastomers for the wheels of the invention at this time.
  • Outer fisks 42 made of fabrics other than muslin, and of fibers other than cotton have been used successfully, as well as metal disks, particularly aluminum disks employed either exclusively or combined with fabric layers in a single disk.
  • a rotatable, laminar backing wheel for an abrasive belt comprising:
  • fastening means coaxially fastening said first disk between said second and third disks under axial compression
  • said second and third disks having respective circumferential face portions defining a common surface of rotation, and said first disk having a circumferential face portion substantially completely confined within said surface when said wheel does not rotate,
  • said first modulus being sufficiently smaller than said second and third moduli to cause the circumferential face portion of said first disk to project radially beyond said common surface under centrifugal forces when said wheel rotates.
  • said compression being sufficient to cause the radially projecting face portion of said first disk to spread axially into radial alignment with said second and third disks.
  • said fastening means include at least one textile thread axially passing through said layers in a plurality of stitches, said face portion of said first layer being free of said stitches.
  • a metal shaping apparatus comprising:

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US500024A 1973-08-24 1974-08-23 Backing wheel for a belt grinder Expired - Lifetime US3890115A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2342831A DE2342831C3 (de) 1973-08-24 1973-08-24 Kontaktscheibe für Bandschleifmaschinen

Publications (1)

Publication Number Publication Date
US3890115A true US3890115A (en) 1975-06-17

Family

ID=5890644

Family Applications (1)

Application Number Title Priority Date Filing Date
US500024A Expired - Lifetime US3890115A (en) 1973-08-24 1974-08-23 Backing wheel for a belt grinder

Country Status (12)

Country Link
US (1) US3890115A (it)
JP (1) JPS533838B2 (it)
AT (1) AT330005B (it)
BE (1) BE819144A (it)
CH (1) CH581009A5 (it)
DE (1) DE2342831C3 (it)
DK (1) DK142566C (it)
FR (1) FR2241383B1 (it)
GB (1) GB1435879A (it)
IT (1) IT1020165B (it)
NL (1) NL167113C (it)
SE (1) SE408532B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD874205S1 (en) * 2018-03-27 2020-02-04 Gideon Williams Duvall Beverage brewing machine external surface belt configuration
TWI812137B (zh) * 2021-03-31 2023-08-11 日商牧野銑床製作所股份有限公司 帶加工裝置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527554A (en) * 1945-04-16 1950-10-31 Minnesota Mining & Mfg Abrading contact wheel
US2977725A (en) * 1957-05-13 1961-04-04 Joseph A Simendinger Contact wheels
US3153306A (en) * 1962-08-27 1964-10-20 Hammond Machinery Builders Inc Belt abrader
US3739535A (en) * 1971-03-03 1973-06-19 Red Lee Metal Finishing Co Inc Fluid cooled hub assembly for a contact wheel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2527554A (en) * 1945-04-16 1950-10-31 Minnesota Mining & Mfg Abrading contact wheel
US2977725A (en) * 1957-05-13 1961-04-04 Joseph A Simendinger Contact wheels
US3153306A (en) * 1962-08-27 1964-10-20 Hammond Machinery Builders Inc Belt abrader
US3739535A (en) * 1971-03-03 1973-06-19 Red Lee Metal Finishing Co Inc Fluid cooled hub assembly for a contact wheel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD874205S1 (en) * 2018-03-27 2020-02-04 Gideon Williams Duvall Beverage brewing machine external surface belt configuration
TWI812137B (zh) * 2021-03-31 2023-08-11 日商牧野銑床製作所股份有限公司 帶加工裝置

Also Published As

Publication number Publication date
DK142566B (da) 1980-11-24
NL7411174A (nl) 1975-02-26
SE7410684L (it) 1975-02-25
DK142566C (da) 1981-09-14
SE408532B (sv) 1979-06-18
DE2342831B2 (de) 1977-08-25
DE2342831A1 (de) 1975-03-13
DK450974A (it) 1975-04-21
IT1020165B (it) 1977-12-20
JPS533838B2 (it) 1978-02-10
AT330005B (de) 1976-06-10
BE819144A (fr) 1974-12-16
DE2342831C3 (de) 1978-04-27
NL167113B (nl) 1981-06-16
GB1435879A (en) 1976-05-19
NL167113C (nl) 1981-11-16
FR2241383A1 (it) 1975-03-21
ATA676074A (de) 1975-08-15
FR2241383B1 (it) 1977-11-04
CH581009A5 (it) 1976-10-29
JPS5072286A (it) 1975-06-14

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