Process and apparatus for the outer calibration of sections of g

Details Process and apparatus for the outer calibration of sections of g Process and apparatus for the outer calibration of sections of g

1991-10-23

1992-05-12

Lindsay, Robert L.

Glass manufacturing

Processes

With measuring, sensing, inspecting, indicating, or testing

65 86, 65158, 6537413, 65DIG9, 33502, C03B 930

Patent

active

051123762

ABSTRACT:
A softened section of length of a glass tube is expanded in a dimensionally accurate mold until it has assumed the dimensions of the mold, the mold being made of a material of lower thermal expansion than that of the glass, so that, after cooling, the calibrated section of tube can be released from the mold without any problems. A block of a .alpha.-o glass ceramic with a calibrated mold bore is preferably employed as the mold. It is possible for the first time to avoid a material-removing machining step, which causes damage to the glass surface, yet to be able to produce sections of the tube with a calibrated outside diameter of a dimensional accuracy which could previously be attained only by cylindrical grinding.

REFERENCES:
patent: 1848940 (1932-03-01), Delpech
patent: 2150017 (1939-03-01), Barnard
patent: 4391622 (1983-07-01), Alting et al.
Glas-Email-Keramo-Technik, 1953, pp. 172-175 May 1953 "Kalibreren von Glasrohren".

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