GB283174A - Process and apparatus for pressing articles of fused silica and novel products resulting therefrom - Google Patents
Process and apparatus for pressing articles of fused silica and novel products resulting therefromInfo
- Publication number
- GB283174A GB283174A GB34862/27A GB3486227A GB283174A GB 283174 A GB283174 A GB 283174A GB 34862/27 A GB34862/27 A GB 34862/27A GB 3486227 A GB3486227 A GB 3486227A GB 283174 A GB283174 A GB 283174A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blank
- crucible
- silica
- furnace
- heated
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B9/00—Blowing glass; Production of hollow glass articles
- C03B9/13—Blowing glass; Production of hollow glass articles in gob feeder machines
- C03B9/193—Blowing glass; Production of hollow glass articles in gob feeder machines in "press-and-blow" machines
- C03B9/1932—Details of such machines, e.g. plungers or plunger mechanisms for the press-and-blow machine, cooling of plungers
- C03B9/1936—Hydraulic or pneumatic displacement means of the plunger
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/021—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by induction heating
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Glass Melting And Manufacturing (AREA)
Abstract
283,174. Quartz et Silice. Jan. 6, 1927 [Convention date]. Forming silica glass articles ; pressing. - A method of producing pressed articles from fused silica consists in heating a silica blank up to a temperature at which the material volatilises freely, and then transferring the blank quickly to the press. The apparatus comprises a furnace A, an hydraulic press B, and a cooling or anneal. ing furnace C. The furnace A consists of a crucible a, which may be made of zirconium or graphite, contained in a casing c which is filled with heat-insulating material d, the whole, being revolvable on an axis e by means of a handle f. The crucible is inductively heated by highfrequency currents passing through a winding b on the outside of the casing and it is fitted with a stopper g having a peep hole h. The press is preferably operated by hydraulic pressure generated by a pump k operated by a motor l. Two moulds or dies m are used and they are operated by opposed cylinders i. The moulds are preferably made of nickel, although carbon or iron-chromium alloys can be used, and they are heated by a gas, ring q or by suitable electric heating means. The furnace C, into which the articles are placed after pressing, is heated up to a temperature of 1200‹ C. by gas burners s. In use, a silica blank is placed in the crucible a and is heated to a temperature of 2200‹ C. at which it volatilizes. The crucible is rotated in order to prevent the blank from sticking to the crucible, and this is also prevented by the free volatilization of the silica in contact with the hot walls of the crucible. The rotation also shapes the softened silica blank. The hot blank is transferred to the press and is shaped by pressure between the heated moulds. The shaped article is then transferred to the furnace C where it is reheated and then allowed to cool slowly. Articles may also be shaped by pressing and blowing. In this case, the silica blank is pressed into a mould t, Fig. 3, by a plunger v which grips a part of the blank against an apertured plate u placed on the mould. The pressed blank, or parison, thus formed is blown to shape by compressed air supplied through passages v<1>, v<2> in the plunger.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR283174X | 1927-01-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB283174A true GB283174A (en) | 1928-05-10 |
Family
ID=8887007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34862/27A Expired GB283174A (en) | 1927-01-06 | 1927-12-23 | Process and apparatus for pressing articles of fused silica and novel products resulting therefrom |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE526901C (en) |
| GB (1) | GB283174A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE747638C (en) * | 1941-02-13 | 1944-10-09 | Process for the production of spherical overpressure discharge lamps made of quartz glass | |
| CZ308253B6 (en) * | 2018-11-14 | 2020-03-25 | Ăšstav fyziky plazmatu AV ÄŚR, v. v. i. | Method of pressing optical elements from glass and a mould for it |
-
1927
- 1927-12-16 DE DES83124D patent/DE526901C/en not_active Expired
- 1927-12-23 GB GB34862/27A patent/GB283174A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE747638C (en) * | 1941-02-13 | 1944-10-09 | Process for the production of spherical overpressure discharge lamps made of quartz glass | |
| CZ308253B6 (en) * | 2018-11-14 | 2020-03-25 | Ăšstav fyziky plazmatu AV ÄŚR, v. v. i. | Method of pressing optical elements from glass and a mould for it |
Also Published As
| Publication number | Publication date |
|---|---|
| DE526901C (en) | 1931-06-11 |
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