Method and apparatus for damping pressure peaks occurring at the end of the mold filling phase in pressure casters
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United States of America Patent
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-
May 23, 1989
Grant Date -
N/A
app pub date -
Sep 24, 1987
filing date -
Sep 27, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a method of damping the pressure peak occurring at the end of the die filling phase in die casting machines, with a hydraulic damping device being disposed between the piston rod of the drive piston and the piston rod of the casting piston. The damping chamber of the damping device is closed by a control piston through which no fluid flows in the case of damping and which is not required to move against the direction of movement of the casting piston rod in order to open the control edge. It is here the object of the invention to shorten to a minimum the response time of the control piston. According to the invention, a device is proposed for this purpose which is characterized in that the chamber (25) disposed on the side opposite the reservoir chamber (10) of the control piston (4) is connected to a pressure medium conduit (26) in which a control valve (27) is disposed. It is here of advantage that a preselectable excess pressure, a vacuum, but preferably atmospheric pressure, is connected to the 'T' terminal of the so-called return flow conduit (28) of the control valve (27).
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