Crosshead and bolster spacing control for servo controlled press

Details Crosshead and bolster spacing control for servo controlled press Crosshead and bolster spacing control for servo controlled press

1982-04-07

1984-07-03

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

33147N, 33181R, G01B 702

Patent

active

044570724

ABSTRACT:
A transducer arrangement provides a feedback signal which indicates the position of a first part relative to a base and when a second movable part is positioned adjacent the first part the transducer provides a signal indicating the spacing between the two parts. Specifically the transducer provides for spacing control between the two halves of a mold mounted in a press wherein a crosshead moves a substantial distance and carries one part of the mold (the upper half) relative to the lower mold part. Hydraulic actuators act on the lower part of the mold to provide the molding force when the mold parts are close together. The transducer is mounted in a housing and arranged to provide a signal used for controlling the hydraulic actuators to control the spacing of the two molds parts unitl the mold parts are separated a known amount, after which the hydraulic actuators are controlled by sensing the spacing of one mold half relative to the base of the press.

REFERENCES:
patent: 1708333 (1929-04-01), Smith
patent: 2208910 (1940-07-01), Pampel et al.
patent: 2822620 (1958-02-01), Ulfeldt
patent: 3082536 (1963-03-01), McClung
patent: 3839944 (1974-10-01), Swift
patent: 4030202 (1977-06-01), Fadl et al.
patent: 4118963 (1978-10-01), Eibe
patent: 4385444 (1983-05-01), Possasti et al.

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