Automated apparatus and method for resin transfer molding

Details Automated apparatus and method for resin transfer molding Automated apparatus and method for resin transfer molding

1993-12-14

1996-05-21

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

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

Temperature control

425145, 425149, B29C 4576

Patent

active

055183883

ABSTRACT:
In an automated apparatus and method for resin transfer molding, a resin pot defining a resin chamber for receiving liquid resin is coupled in fluid communication with a mold cavity. A pump unit in the form of a piston member driven by a hydraulic cylinder, is received within the resin chamber, and pumps the resin from the resin chamber into the mold cavity upon stroking the piston member. A control unit is coupled to the pump unit, and to a pressure sensor which transmits signals to the control unit indicative of the pressure of the resin flowing between the resin chamber and the mold cavity. The control unit is responsive to the signals from the pressure sensor to control the pump unit, and maintain the resin flowing between the resin chamber and the mold cavity at a substantially constant pressure. Another sensing unit, in the form of a position sensor, transmits signals to the control unit indicative of movement of the pump unit, and thus indicative of the flow rate of resin between the resin chamber and the mold cavity. The control unit is responsive to the signals transmitted by the position sensor, to terminate the flow of resin into the mold cavity and operation of the pump unit, and thus terminate the resin transfer process, in response to the flow rate of resin decreasing below a predetermined minimum value.

REFERENCES:
patent: 3840312 (1974-10-01), Paulson et al.
patent: 4386898 (1983-06-01), Sera

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