Mill hydraulic screw-down

Details Mill hydraulic screw-down Mill hydraulic screw-down

1975-09-19

1976-08-17

Mehr, Milton S.

Metal deforming

With use of control means energized in response to activator...

Sensing tool or tool-linked part

72 35, 72245, B21B 3708, B21B 3134, B21B 3132

Patent

active

039746720

ABSTRACT:
A hydraulically driven mill screw-down including an optical encoder directly coupled to the hydraulic drive for producing digital signals representative of motion and direction of motion of the movable roll, a bidirectional counter for maintaining a cumulative count representative of roll position, a pulse source, a bidirectional reference counter for maintaining a count representative of desired roll position, a digital subtractor for producing a difference signal, an analog-to-digital converter for producing an analog signal proportional to the digital difference signal, a servo amplifier and a continuously variable hydraulic valve for controlling the application of fluid pressure to the hydraulic screw-down apparatus. Also disclosed is an emergency stop preset register for dumping an emergency stop desired position into the reference counter when actuated.

REFERENCES:
patent: 3570288 (1971-03-01), Fischer et al.
patent: 3587279 (1971-06-01), Sendzimir et al.

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