Use of speed changes during cycling of a shaping mold

Details Use of speed changes during cycling of a shaping mold Use of speed changes during cycling of a shaping mold

1979-11-02

1981-04-07

Kellogg, Arthur D.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65107, 65273, 65287, 65289, C03B 2303

Patent

active

042604087

ABSTRACT:
When glass sheets are shaped by a bending method in which the glass is first shaped to a longitudinal component of bend by gravity sagging onto an outline mold followed by press bending against a solid lower shaping mold to complete the bend which includes a complicated transverse component of bend, a particular speed cycle is provided to lift and lower the lower shaping mold to minimize the duration of the shaping cycle and to minimize the chance of misaligning the glass relative to the outline mold during transfer of the glass from the outline mold to the lower shaping mold and its return to the outline mold. This speed cycle includes a rapid initial lifting speed and final lowering speed of the lower shaping mold while it is out of contact with the glass and a lower speed of lifting and lowering when the lower shaping mold contacts and supports the glass.

REFERENCES:
patent: 2570309 (1951-10-01), Black

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