Device for hydraulic drive of injection molding machines

Details Device for hydraulic drive of injection molding machines Device for hydraulic drive of injection molding machines

1994-02-07

1996-06-25

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

Mold motion or position control

425171, 425589, 425590, B29C 4580

Patent

active

055294782

ABSTRACT:
An acceleration pressure is used as set value for the movement of the mass which is to be shifted, such as the mold clamping unit in an injection molding machine. For this purpose it is proposed to use preferably an electrically modulated pressure control valve for the pressure regulating device in the pressure drive system. Even with extremely short acceleration periods resonance oscillations are avoided, which until now prohibited the reduction of the acceleration period. With computing devices the movement of the mass can now be really controlled in relation to a selected velocity profile and/or a position profile or at least a part thereof.

REFERENCES:
patent: 3433256 (1969-03-01), Stillhard et al.
patent: 4240781 (1980-12-01), Flickinger et al.
patent: 4312828 (1982-01-01), Flickinger et al.
patent: 4375747 (1983-03-01), Friedrich
patent: 4563939 (1986-01-01), Siegrist
patent: 4817498 (1989-04-01), Takagi
patent: 4855095 (1989-08-01), Sato
Backe, Fluidtechnische Realisierung Ungleichmassiger Periodischer Bewegungen, Olhydraulic und Pneumatik, at 22 (May, 1987).

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