Hydraulic press assembly

Details Hydraulic press assembly Hydraulic press assembly

1981-02-13

1983-02-15

Pavelko, Thomas P.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Mold motion or position control

4254512, B29C 300

Patent

active

043738893

ABSTRACT:
A hydraulic press having an upper ram-die subassembly is lowered hydraulically toward a mold cavity at a relatively high speed while resting by gravity on lower sets of nuts attached to the lower ends of piston rods. When the upper die comes to rest on the pulverulent material in the cavity, the piston rods continue their downward movement through passageways in the ram. At a predetermined distance sensed by a sensor on a set of upper nuts located on the rods above the ram cooperating with a switch on the ram itself, the ram continues downward at a much slower speed against the material with very high pressure for an initial stroke and then is retracted for additional strokes to "de-air" the powder (optional). Finally, after de-airing, the ram-die combination effects the final forming operation on the powder in the cavity.

REFERENCES:
patent: 2689978 (1954-09-01), Roger
patent: 3704973 (1972-12-01), Renfrew
patent: 4106885 (1978-08-01), Poncet

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