Injection assembly for pressure die casting systems
AssigneeIdra S.R.L.
InventorsFiorenzo DIONI, Richard OBERLE
Life of this patent
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Abstract
An injection assembly, for pressure die casting systems, has an injection cylinder adapted to inject liquid metal into a casting cavity; the injection cylinder is actuated by a hydraulic flow of an oil-pressure controlled circuit; the oil-pressure controlled circuit includes a hydraulic cushion which blocks and releases the flow of the hydraulic fluid in the injection cylinder and provides a counter-pressure of preset value to control the injection speeds and to prevent cavitation in the injection cylinder.
Claims7
An injection assembly for pressure die casting systems, comprising an injection cylinder adapted to inject liquid metal into a casting cavity, said injection cylinder being actuated by a hydraulic flow of an oil-pressure controlled circuit;
- said oil-pressure controlled circuit comprising a hydraulic cushion which blocks and releases the flow of said hydraulic fluid in said injection cylinder;
- said hydraulic cylinder providing a counter pressure of a preset value to control the injection speeds and to prevent cavitation in said injection cylinder;
- said injection cylinder comprising an injection piston which forms a piston side chamber and an annular chamber;
- said hydraulic cushion comprising a cylindrical body which contains a stem provided with a piston and moving axially in said cylindrical body;
- said piston dividing the internal volume of said cylindrical body into a reduced chamber and into a larger chamber;
- wherein said cylindrical body of said hydraulic cushion comprises a resting surface opposed to said stem;
- said resting surface being smaller than the surface of said stem.
Dependencies are inferred from the claim text.