B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/706
B29C 45/66 (2006.01) B29C 45/56 (2006.01) B29C 45/82 (2006.01)
Patent
CA 1277115
HYDRAULIC SYSTEM FOR A TOGGLE-TYPE PLASTIC INJECTION MOLDING MACHINE CAPABLE OF PRECISION COINING Ronald A. Hertzer ABSTRACT OF THE INVENTION An improved computer controlled hydraulic system for a conventional toggle-type plastic injection molding machine of the type comprising an injection assembly and a mold clamping assembly. The hydraulic system comprises a first low volume pump and a second high volume pump connected between a reservoir of hydraulic fluid and a pressure and flow control manifold. The output of the pressure and flow control manifold is connected to an injection control manifold, in turn connected to and operating the instrumentalities of the injection assembly. The output of the pressure and flow control manifold is also connected to a clamping control mani- fold, in turn connected to and operating the cylinder of the clamping assembly. An isolation manifold is con- nected between the pressure and flow control manifold and the clamping control manifold. A third low volume pump is connected between the reservoir and the isolation manifold. The isolation manifold is also connected to the reservoir. When unactuated, the isolation manifold connects the output of the pressure and flow control manifold directly to the clamping control manifold and recirculates the third pump to reservoir, when the machine is to perform sequential cycles such as conven- tional injection molding or conventional coining. When actuated, the isolation manifold disconnects the clamping manifold from the pressure and flow control manifold and connects the third pump to the clamping control manifold, enabling the machine to perform a coining cycle with individual and simultaneous clamping and injection control, and precise and repeatable position and speed control of the coining step.
543341
Cincinnati Milacron Inc.
Smart & Biggar
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