Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1979-04-12
1981-10-20
Kellogg, Arthur D.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65110, 65359, 65102, 651821, C03B 2300
Patent
active
042958733
ABSTRACT:
A method and apparatus for reworking hollow workpieces, illustratively glass lamp bulbs, to a desired dimensional accuracy and optical finish. In the method, a workpiece is placed within a mold having a cavity which defines the desired dimensions. Molten metal, preferably tin, of temperature sufficient to soften the workpiece is introduced into the hollow interior of the workpiece. The static pressure of the molten metal forces the softened workpiece into contact with the interior surface of the mold thereby imparting to the workpiece the desired dimensions. Molten metal of lower temperature is then introduced into the workpiece from a lower interior portion thereof, displacing the molten metal of high temperature out of the workpiece. The newly introduced molten metal cools the workpiece so that it may be handled without deforming. The molten metal is then removed from the interior of the workpiece and the workpiece is removed from the mold. The method may advantageously be employed in a nonoxidizing environment, such as one of nitrogen gas.
In the apparatus, first and second mold portions have interior portions which align to define a mold cavity. The mold portions are laterally separated to receive a workpiece within the mold cavity. A reservoir supplies heated fluid to the interior of the hollow workpiece. The mold portions and contained workpiece are downwardly rotated to decant fluid from the interior of the workpiece.
REFERENCES:
patent: 1777206 (1930-09-01), Burthe et al.
patent: 3233999 (1966-02-01), Mumford
patent: 3283046 (1966-11-01), De Witt et al.
patent: 4010021 (1977-03-01), Foster
Thorington Luke
Trutner Donald G.
Duro-Test Corporation
Kellogg Arthur D.
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