US2088393A - Glass grinding apparatus - Google Patents

Glass grinding apparatus Download PDF

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Publication number
US2088393A
US2088393A US5507A US550735A US2088393A US 2088393 A US2088393 A US 2088393A US 5507 A US5507 A US 5507A US 550735 A US550735 A US 550735A US 2088393 A US2088393 A US 2088393A
Authority
US
United States
Prior art keywords
grooves
sets
grinding
abrasive
glass
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
US5507A
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
Application filed by Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Application granted granted Critical
Publication of US2088393A publication Critical patent/US2088393A/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

  • This invention relates to grinding tools for grinding a travelling strip of glass, and has for its object a grinding tool in which the operative surface is so disposed as to produce a flatter sur- 5 face on the glass and to grind more efficiently.
  • 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 a block, it travels to the outer edge of this so block while performing grinding work.
  • grooves servbe 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 ofgrinding surface in any one ring differs largely from that in the adjacent rings. Now the condition that the area of grinding surface in any one ring should not differ largely from that in the adjacent rings can be 50 fulfilled by making the mixing grooves elliptical or eccentric, with suitable eccentricity.
  • a grinding tool with such grooves is found to grind unevenly for the reason that the abrasive becomes unevenly distributed round the elliptic or eccentric grooves, being driven by centrifugal ing mainly to lead the abrasive outwardly will force to the portions of the grooves at greater radii.
  • a disc grinding tool for operating on travelling fiat glass has its operative surface broken up into blocks by two sets of grooves, each block of the majority of blocks having two faces inclined at different anglealess than ninety degrees, to the radius of the tool, so that the outer end of each such face is not behind (with reference to the direction of rotation). its inner end.
  • each such face is preferably inclined to the operative surface, so that its edge away from the operative surface is in advance of its edge on the operative surface.
  • Figures 1 and 2 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 3 is a plan view of one of the blocks of Figure '2, showing an alternative form of block.
  • the disc I with central hole 2, through which abrasive is supplied, has fixed to it, or formed on it, blocks 3.
  • the disc turns in the direction shown by the arrow.
  • the blocks 3 are formed by two sets of grooves 4 and 5.
  • the spreading grooves 4 are inclined to the radius, so that their outer portions are in advance of the inner portions.
  • the mixing grooves 5 are at a substantially greater inclination in the same direction. The grooves terminate before the outer edge of the disc, leaving a solid rim 6.
  • the blocks formed by the two sets of grooves (excepting the innermost blocks and the outer rim) have two leading faces inclined to the radius, so that the outer end of each such face is in advance of the inner end.
  • the abrasive is evenly distributed, and the blocks can be formed in a variety of ways, of which the three figures show examples, so that the abrasive nowhere has an unduly long operative path before becoming mixed with fresh abrasive and so that no concentric ring of the tool differs largely in grinding area from the adjacent rings.
  • the grinding areas expressed as percentages of the whole area of the ring, in the successive rings, starting from the innermost, are:-
  • the invention includes the case where the inclination to the radius of the faces produced by the spreading grooves is zero, but this inclination is preferably a substantial angle.
  • Disc grinding tool for operating on travelling flat glass having a solid outer rim and two sets of intersecting grooves, substantially equal in number, the two sets being inclined respectively at different angles, between 0 and ninety degrees to the radius, so that the outer end of each groove is in advance (with reference to the direction of rotation) of its inner end, and a plurality of four-sided blocks of which the sides are formed by the said two sets of grooves, two of the sides thereof facing their direction of travel at such angles that the outer end of each is in advance of the inner.
  • Disc grinding tool for operating on travelling fiat glass having a solid outer rim and two sets of intersecting grooves, substantially equal in number, the two sets being inclined respectively at different angles, between 0 and ninety degrees to the radius, so that the outer end of each groove is in advance (with reference to the direction of rotation) of its inner end, and a plurality of four-sided blocks of which the sides are formed by the said two sets of grooves, two
  • Disc grinding tool for operating on travelling fiat glass having a solid outer rim and two sets of intersecting grooves, substantially equal in number, the two sets being inclined respectively at different angles between 0 and ninety degrees to the radius, so that the outer end of each groove is in advance (with reference to the direction of rotation) of its inner end, and a plurality of four-sided blocks of which the sides are formed by the said two sets of grooves, two of the sides thereof facing their direction of travel at such angles that the outer end of each is in advance of the inner, at least one of the two facing sides of each block being curved so that the inclination to the radius of any one block is greater than that of a block located nearer to the centre of the disc.
  • Disc grinding tool for operating on travelling fiat glass having a solid outer rim and two sets of intersecting grooves, substantially equal in number the two sets being inclined respectively at different angles between 0 and ninety degrees to the radius, so that the outer end of each groove is in advance (with reference to the direction of rotation) of its inner end, and a plurality of four-sided blocks of which the sides are formed by the said two sets of grooves, two of the sides thereof facing their direction of travel at such angles that the outer end of each is in advance of the inner, the trailing wall of each of the grooves of at least one of the two sets being so inclined to the operative surface that the edge of the wall away from the surface is in advance of the edge on the surface.

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)
US5507A 1935-02-04 1935-02-08 Glass grinding apparatus Expired - Lifetime US2088393A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB785087X 1935-02-04

Publications (1)

Publication Number Publication Date
US2088393A true US2088393A (en) 1937-07-27

Family

ID=32800436

Family Applications (2)

Application Number Title Priority Date Filing Date
US5507A Expired - Lifetime US2088393A (en) 1935-02-04 1935-02-08 Glass grinding apparatus
US137077A Expired - Lifetime US2088392A (en) 1935-02-04 1937-04-15 Glass grinding apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
US137077A Expired - Lifetime US2088392A (en) 1935-02-04 1937-04-15 Glass grinding apparatus

Country Status (6)

Country Link
US (2) US2088393A (sk)
BE (1) BE407653A (sk)
DE (1) DE663797C (sk)
FR (1) FR785087A (sk)
GB (1) GB467835A (sk)
NL (1) NL41206C (sk)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476334A (en) * 1946-06-27 1949-07-19 Titcomb Albert Shepard Abrasive wheel
US3142946A (en) * 1961-06-28 1964-08-04 Libbey Owens Ford Glass Co Grinding runner
US6267660B1 (en) * 1999-02-02 2001-07-31 Poul Erik Jespersen Rotatable grinding or polishing tool, an apparatus with such a tool and a method for grinding or polishing
US20160256982A1 (en) * 2015-03-04 2016-09-08 Saint-Gobain Abrasives, Inc. Abrasive article and method of use

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5243790A (en) * 1992-06-25 1993-09-14 Abrasifs Vega, Inc. Abrasive member
WO2021262602A1 (en) * 2020-06-26 2021-12-30 Applied Materials, Inc. Conditioner disk for use on soft or 3d printed pads during cmp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476334A (en) * 1946-06-27 1949-07-19 Titcomb Albert Shepard Abrasive wheel
US3142946A (en) * 1961-06-28 1964-08-04 Libbey Owens Ford Glass Co Grinding runner
US6267660B1 (en) * 1999-02-02 2001-07-31 Poul Erik Jespersen Rotatable grinding or polishing tool, an apparatus with such a tool and a method for grinding or polishing
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
FR785087A (fr) 1935-08-01
BE407653A (sk)
DE663797C (de) 1938-08-13
NL41206C (sk)
GB467835A (en) 1937-06-23
US2088392A (en) 1937-07-27

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