Method for the precision moulding of glass articles, method of m

Details Method for the precision moulding of glass articles, method of m Method for the precision moulding of glass articles, method of m

1982-01-18

1983-08-09

Kellogg, Arthur D.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65 26, 65103, 65275, 65305, 65319, 6537413, C03B 1112, C03B 2702

Patent

active

043976697

ABSTRACT:
A method for the manufacture of a mould intended for the precision moulding of glass articles, notably aspherical lenses. The desired shape and dimensional accuracy are imparted to a mechanically treated preform by an accurate polishing operation. Subsequently, the polished preform is prestressed and reinforced by a chemothermal treatment. The surface of the mould thus obtained comprises an edge zone which is subject to compressive stress and which changes over, via a neutral stress-free zone, to the core which is subject to tensile stress. The mould in accordance with the invention has a longer life and produces moulded products having a quality which is higher than that of products made by means of known moulds.

REFERENCES:
patent: 2253697 (1941-08-01), Genesy
patent: 3155748 (1964-11-01), Couri
patent: 3244497 (1966-04-01), Copeland

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