Die casting machine with piston positioning control

Details Die casting machine with piston positioning control Die casting machine with piston positioning control

1974-01-02

1976-05-18

Schwadron, Martin P.

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

92223, 92248, 116124D, F01B 2526, F01B 3112

Patent

active

039569730

ABSTRACT:
A die casting machine has a piston rod connected to its main ram for positioning the ram as the piston rod extends and retracts from a cylinder. A control system is provided which directly senses the position, velocity and acceleration of the piston rod. A smooth continguous outer surface is formed on the piston rod. Magnetic and non-magnetic materials spaced alternately axially along the rod provide a series of magnetic discontinuity fields along the piston rod. Transducers are provided to sense the magnetic discontinuities as the piston rod moves to provide signals indicative of the position, velocity and acceleration of the piston rod. An electrohydraulic servo valve is electrically connected to the transducers and to a control console for moving the piston rod and for recording its position, velocity, and acceleration.

REFERENCES:
patent: 1195546 (1916-08-01), Wrightson
patent: 1204889 (1916-11-01), Lilly
patent: 2430757 (1947-11-01), Conrad et al.
patent: 3004336 (1961-10-01), Timuska
patent: 3095785 (1963-07-01), Cahill
patent: 3176241 (1965-03-01), Hogan et al.
patent: 3203321 (1965-08-01), Rosen
patent: 3212411 (1965-10-01), Storms
patent: 3218591 (1965-11-01), Caruthers
patent: 3231882 (1966-01-01), De Neergaard
patent: 3242472 (1966-03-01), Anthony
patent: 3641535 (1972-02-01), Knopf
patent: 3649450 (1972-03-01), Barton
patent: 3654549 (1972-04-01), Maurer et al.

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