Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1987-09-04
1989-01-10
Jordan, M.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164155, B22D 3700
Patent
active
047966882
ABSTRACT:
The variation with time of the temperature is analyzed during the heating-up of a melting charge in dental engineering. If the slope (d.theta./dt) of the temperature curve changes by a predetermined measure, this is used for detecting the liquidus point. Time and/or temperature for casting the melt are determined by a criterion (.DELTA..theta.; .DELTA.t) referring to the liquidus point determined in this manner. The values determined for the casting time and other casting parameters are stored and used as controlling variables for subsequent melting and casting processes. In addition, the entire temperature variations of successive processes can be stored. A subsequently measured temperature variation is compared with the stored temperature variations during the measurement (section by section). In the case of agreement (within predetermined tolerances) an identified stored temperature variation is used as nominal variation for the further melting and casting process.
REFERENCES:
patent: 3620294 (1971-11-01), Hetzel et al.
patent: 3788382 (1974-01-01), Daniel et al.
Gundlach Hans-Werner
Jacob Friedrich
Bego Bremer Goldschagerei Wilh. Herbst GmbH & Co.
Jordan M.
Seidel Richard K.
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