GB1106062A - Bending of glass - Google Patents

Bending of glass

Info

Publication number
GB1106062A
GB1106062A GB992865A GB992865A GB1106062A GB 1106062 A GB1106062 A GB 1106062A GB 992865 A GB992865 A GB 992865A GB 992865 A GB992865 A GB 992865A GB 1106062 A GB1106062 A GB 1106062A
Authority
GB
United Kingdom
Prior art keywords
glass
coating
heated
alternatively
give
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
Application number
GB992865A
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss AG
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 Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB1106062A publication Critical patent/GB1106062A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/06—Devices for shaping or setting watch glasses
    • G04D3/062—Shaping without chipping away, e.g. by hot pressing or by punching out the whole piece from a plate
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/02—Re-forming glass sheets
    • C03B23/023—Re-forming glass sheets by bending
    • G—PHYSICS
    • G04—HOROLOGY
    • G04B—MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
    • G04B39/00—Watch crystals; Fastening or sealing of crystals; Clock glasses

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Surface Treatment Of Glass (AREA)

Abstract

A method of bending glass plates in an arcuate fashion comprises applying a coating to at least one part of the glass surface such that the surface stress (compressive or tensile) at that part, when the glass is heated to its deformation temperature, are different from the surface stresses on the opposite surface so that the plate becomes curved, without any action of external forces, on being heated. Alternatively a diffential surface stress may be induced by leaching the glass on one side. The applied coating may have a coefficient of expansion less than that of the glass to give a concave surface. The coating may alternatively be a thin dense layer of aluminium, silicon, titanium, or their suboxides which on heating and oxidation give a convex surface. The coating may contain volatile matter, e.g. urea, camphor or ammonium chloride, which can be removed e.g. by a weak alkaline solution, thus leaving a porous layer which on heating provides a concave surface. By varying the thickness of the coating over various parts of the glass surface different radii of curvature can be obtained.ALSO:A method of bending glass plates in an arcuate fashion comprises applying a coating to at least one part of the glass surface such that the surface stress (compressive or tensile) at that part, when the glass is heated to its deformation temperature, are different from the surface stresses on the opposite surface so that the plate becomes curved, without any action of external forces, on being heated. Alternatively a differential surface stress may be induced by leaching the glass on one side. The applied coating may have a coefficient of expansion less than that of the glass to give a concave surface. The coating may alternatively be a thin dense layer of aluminium, silicon, titanium, or their sub-oxides which on heating and oxidation give a convex surface. The coating may contain volatile matter, e.g. urea, camphor or ammonium chloride, which can be removed e.g. by a weak alkaline solution, thus leaving a porous layer which on heating provides a concave surface. By varying the thickness of the coating over various parts of the glass surface different radii of curvature can be obtained.
GB992865A 1964-03-13 1965-03-09 Bending of glass Expired GB1106062A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1964J0025444 DE1244345B (en) 1964-03-13 1964-03-13 Method of bending glass sheets

Publications (1)

Publication Number Publication Date
GB1106062A true GB1106062A (en) 1968-03-13

Family

ID=7202228

Family Applications (1)

Application Number Title Priority Date Filing Date
GB992865A Expired GB1106062A (en) 1964-03-13 1965-03-09 Bending of glass

Country Status (5)

Country Link
BE (1) BE660995A (en)
CH (2) CH463401A (en)
DE (1) DE1244345B (en)
FR (1) FR1426636A (en)
GB (1) GB1106062A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028781A2 (en) * 1996-12-20 1998-07-02 Forschungszentrum Jülich GmbH Layer with a porous layer area, an interference filter containing such a layer and a method for the production thereof
CN108943670A (en) * 2018-06-28 2018-12-07 信利光电股份有限公司 A kind of 3D cover board and its processing method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504106A (en) * 1973-05-17 1975-01-17

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998028781A2 (en) * 1996-12-20 1998-07-02 Forschungszentrum Jülich GmbH Layer with a porous layer area, an interference filter containing such a layer and a method for the production thereof
WO1998028781A3 (en) * 1996-12-20 1999-02-25 Forschungszentrum Juelich Gmbh Layer with a porous layer area, an interference filter containing such a layer and a method for the production thereof
US6413408B1 (en) 1996-12-20 2002-07-02 Forschungszentrum Jülieh GmbH Method for the production of a porous layer
CN108943670A (en) * 2018-06-28 2018-12-07 信利光电股份有限公司 A kind of 3D cover board and its processing method

Also Published As

Publication number Publication date
CH444393A (en) 1967-09-30
FR1426636A (en) 1966-01-28
CH337665A4 (en) 1968-05-15
CH463401A (en) 1968-11-15
DE1244345B (en) 1967-07-13
BE660995A (en) 1965-07-01

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