US2019205A - Glass grinding apparatus - Google Patents

Glass grinding apparatus Download PDF

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Publication number
US2019205A
US2019205A US5508A US550835A US2019205A US 2019205 A US2019205 A US 2019205A US 5508 A US5508 A US 5508A US 550835 A US550835 A US 550835A US 2019205 A US2019205 A US 2019205A
Authority
US
United States
Prior art keywords
grooves
portions
radius
operative surface
abrasive
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
US5508A
Other languages
English (en)
Inventor
Waldron Frederic Barnes
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers Ltd
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
Priority to BE407652D priority Critical patent/BE407652A/xx
Priority to NL41404D priority patent/NL41404C/xx
Priority to FR785088D priority patent/FR785088A/fr
Priority to DEP70733D priority patent/DE659172C/de
Application filed by Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Priority to US5508A priority patent/US2019205A/en
Application granted granted Critical
Publication of US2019205A publication Critical patent/US2019205A/en
Priority to GB35610/35A priority patent/GB467836A/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
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
    • B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
    • 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

Definitions

  • the operative surface of grinding tools used in a continuous grinding machine on a travelling strip of glass, and supplied with abrasive at the centre of the tools, is commonly composed of the surfaces of blocks, formed by two sets of grooves, one set leading the abrasive outwardly from the centre, while the other set is circular, and concentric with the axis of the tool.
  • the outwardly leading grooves serve to enable abrasive supplied at the centre to reach the outer parts of the tool, and the circular grooves serve for the renewal of the spent abrasive.
  • a quantity of abrasive reaches the operative surface of the block, it travels to the outer edge of this block while performing grinding work. After doing a certain amount of grinding, it loses its efilciency as an abrasive. Its path from the inner to the outer edge of the block, that is to say, from one circular groove to the next, is such that, before the abrasive becomes spent, it reaches a circular groove and there becomes mixed with fresh abrasive, so that fresh abrasive reaches the operative surface of the next block outwards.
  • grooves serving mainly to lead the abrasive outwardly will be termed spreading grooves
  • grooves serving mainly to provide fresh abrasive will be termed mixing grooves.
  • the spreading grooves are radial and the mixing grooves circular.
  • the glass produced by grinding tools of the above described customary form is sufficiently flat for many commercial purposes, but certain irregularities in flatness are produced which render the glass unsuitable for certain purposes.
  • annular grinding surface be regarded as divided up into narrow concentric rings, it has been found that irregularities in flatness are produced when the area of grinding surface in any one ring differs largely from that in the adjacent rings.
  • a disc grinding tool for operating on travelling flat glass has its op- 1557 erative surface broken up by grooves reaching from the central space to points near the periphery, the grooves having a plurality of portio-ns inclined to the radius by an angle greater than 45, the inclination being such that the outer ends of such portions are in advance (having reference to the direction of rotation) of their inner ends.
  • the grooves are preferably wider at the operative surface than at the bottom, at least in the said inclined portions, the greater width being given by inclination of their trailing walls.
  • the said portions may be straight or curved, and each groove may consist entirely of curved portions.
  • the inclination to the radius of the said inclined portions preferably increases V with increasing radius.
  • Figures 1, 2 and 3 are each plan views of the operative surface of one-quarter of a grinding tool, showing alternative forms of the invention on a single disc, and
  • Figure 4 is a plan view of a portion of Figure 2, showing an alternative form of groove.
  • each groove 3 has a short inner radial portion 6, then a portion 1 inclined to the radius at about 70, then another short radial portion 8, then a portion 9 inclined to the radius at about 75, then another short radial portion I0 and finally a portion ll inclined to the radius at about 80".
  • each groove 3 has three straight portions I2 inclined to the radius at about 25, alternating with curved portions [3, l4 and I5 at average inclinations to the radius of about and respectively.
  • each groove 3 is of the same general form as the grooves in Figure 2, but is curved into a wavy form throughout.
  • Figure 4 shows the inner portion of the groove marked 3' in Figure 2, but so formed as to be wider at the operative surface than at the bottom, the greater width being given by inclining the trailing wall as at Hi,
  • This form of groove is of advantage in tools operating on the under surface of a strip of glass, since, as explained in my Patent No. 1,956,781, the abrasive is forced upwards to the operative surface by reason of the inclination of the wall l6 together with the inclination of the groove.
  • Disc grinding tool for operating on travelling fiat glass, grooves in the operative surface thereof of general zig-zag form reaching from the central space to points near the periphery, and having a plurality of portions which produce leading faces of the operative surface inclined to the radius by angles between forty-five and seventy degrees near their inner ends and between fifty and eighty degrees near their outer ends, the inclination being such that the outer ends of such portions are in advance (with reference to the direction of rotation) of their inner ends,
  • Disc grinding tool for operating on travelling fiat glass, grooves in the operative surface thereof of general zig-zag form reaching from the central space to points near the periphery, and having a plurality of portions which produce leading faces of the operative surface inclined to the radius by angles between forty-five and seventy degrees near their inner ends and between fifty and eighty degrees near their outer ends, the inclination being such that the outer ends of such portions are in advance (with reference to the direction of rotation) of their inner ends, and other portions alternating with the said portions inclined to the radius in the same direction but to a lesser degree.
  • Disc grinding tool for operating on travelling fiat glass grooves in the operative surface thereof of general zig-zag form reaching from the central space to points near the periphery and having a plurality of portions which produce leading faces of the operative surface inclined to the radius by angles between forty-five and seventy degrees near their inner ends and between fifty and eighty degrees near their outer ends, the inclination being such that the outer ends of such portions are in advance (with reference to the direction of rotation) of their inner ends, and radial portions alternating with the said portions.
  • Disc grinding tool for operating on travelling flat glass wavy grooves in the operative surface thereof of general zig-zag form reaching from the central space to points near the periphery having a plurality of portions which produce leading faces of the operative surface inclined to the radius by angles between f orty-five and seven ty degrees near their inner ends and between fifty and eighty degrees near their outer ends, the inclination being such that the outer ends of such portions are in advance (with reference to the direction of rotation) of their inner ends.
  • Disc grinding tool for operating on travelling flat glass grooves in the operating surface thereof of general zig-zag form reaching from the central space to points near the periphery, and having a plurality of portions which produce leading faces of the operative surface inclined to the radius by angles between forty-five and seventy degrees near their inner ends and between fifty and eighty degrees near their outer ends, the inclination being such that the outer ends of such portions are in advance (with reference to the direction of rotation) of their inner ends, the grooves being Wider at the operative surface than at the bottom, the greater width being given by inclination of their trailing walls.
  • Disc grinding tool for operating on travelling flat glass wavy grooves in the operative surface thereof of general zig-zag form reaching from the central space to points near the periphery, having a plurality of portions which produce leading faces of the operative surface inclined to the radius by angles between forty-five and seventy degrees near their inner ends and between fifty and eighty degrees near their outer ends, the inclination being such that the outer ends of such portions are in advance (with reference to the direction of rotation) of their inner ends, the grooves being Wider at the operative surface than at the bottom, the greater width being given by inclination of their trailing Walls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
US5508A 1935-02-08 1935-02-08 Glass grinding apparatus Expired - Lifetime US2019205A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE407652D BE407652A (de) 1935-02-08
NL41404D NL41404C (de) 1935-02-08
FR785088D FR785088A (fr) 1935-02-08 1935-02-04 Appareil à dresser le verre
DEP70733D DE659172C (de) 1935-02-08 1935-02-05 Scheibenfoermiges Schleifwerkzeug fuer Flachglas
US5508A US2019205A (en) 1935-02-08 1935-02-08 Glass grinding apparatus
GB35610/35A GB467836A (en) 1935-02-08 1935-12-23 Improvements in glass grinding tools

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US5508A US2019205A (en) 1935-02-08 1935-02-08 Glass grinding apparatus

Publications (1)

Publication Number Publication Date
US2019205A true US2019205A (en) 1935-10-29

Family

ID=21716230

Family Applications (1)

Application Number Title Priority Date Filing Date
US5508A Expired - Lifetime US2019205A (en) 1935-02-08 1935-02-08 Glass grinding apparatus

Country Status (6)

Country Link
US (1) US2019205A (de)
BE (1) BE407652A (de)
DE (1) DE659172C (de)
FR (1) FR785088A (de)
GB (1) GB467836A (de)
NL (1) NL41404C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160256982A1 (en) * 2015-03-04 2016-09-08 Saint-Gobain Abrasives, Inc. Abrasive article and method of use

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093250B (de) * 1951-05-24 1960-11-17 Saint Gobain Verfahren und Apparat zum Schleifen und Polieren der Oberflaeche eines ununterbrochen fortbewegten Glasbandes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160256982A1 (en) * 2015-03-04 2016-09-08 Saint-Gobain Abrasives, Inc. Abrasive article and method of use
US10086499B2 (en) * 2015-03-04 2018-10-02 Saint-Gobain Abrasives, Inc. Abrasive article and method of use

Also Published As

Publication number Publication date
NL41404C (de)
FR785088A (fr) 1935-08-01
DE659172C (de) 1938-04-27
GB467836A (en) 1937-06-23
BE407652A (de)

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