Press molding apparatus and press molding method

Details Press molding apparatus and press molding method Press molding apparatus and press molding method

2005-07-19

2005-07-19

Griffin, Steven P. (Department: 1731)

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

C065S305000, C065S319000, C264S001320

Reexamination Certificate

active

06918267

ABSTRACT:
A press molding apparatus includes upper and lower mother molds102and104. Each of the mother molds102and104has four molding surfaces arranged in a single line and satisfies the relationship given by L×α×ΔT/t<0.0008, where L represents the length, t, the thickness, α, the thermal expansion coefficient, and ΔT, the temperature difference between both ends in the thickness direction during induction heating. The press molding apparatus may include a pressing mold set including upper mother molds102aand102battached to a common fixed shaft118through upper supporting shafts110aand110band lower mother molds104aand104bdriven by a common drive shaft120through lower supporting shafts112aand112b. The upper mother molds102aand102band the lower mother molds104aand104bare collectively heated by induction heating coils122and124, respectively.

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