Claims
- 1. Apparatus for controlling the rate of filling of a casting mold, comprising:
- a first chamber containing a crucible for the material to be cast and first pressure means operatively associated with the first chamber for supplying a pressure P.sub.1 to the crucible;
- a second chamber adjacent said first chamber and containing a casting mold and second pressure means operatively associated with the second chamber for supplying a pressure P.sub.2 to the mold;
- a tube extending between said chambers and connecting said crucible to said mold for conducting said material into said mold at a flow rate determined by the pressure differential P = P.sub.1 - P.sub.2 ; first signal-producing means connected to at least one of said chambers for producing a first signal representing the time derivative of one of said pressures;
- monitoring means connected to said signal-producing means for monitoring said first signal and controlling said one of said pressures to maintain the time derivative thereof substantially constant;
- second signal-producing means connected to said first signal-producing means for providing a second signal representing the time derivative of one of the parameters constituted by said pressure differential and the other of said pressures;
- comparison means connected to said second signal-producing means for comparing said second signal with a set-point value in accordance with a predetermined program; and
- control means connected to said comparison means for controlling said other pressure in response to a signal representing the comparison of said second signal and said set-point value.
- 2. An apparatus as defined in claim 1 wherein said second signal-producing means includes means for measuring said pressure differential.
- 3. An apparatus as defined in claim 1 wherein said second signal producing means includes means responsive to the other of said pressures.
Priority Claims (1)
Number |
Date |
Country |
Kind |
24336 |
Aug 1973 |
BG |
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Parent Case Info
This is a division of application 496,741 filed 12 Aug. 74, now U.S. Pat. No. 3,961,662, issued 8 June 1976.
US Referenced Citations (9)
Divisions (1)
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Number |
Date |
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Parent |
496741 |
Aug 1974 |
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