US3597597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for monitoring the progress of rimming of a steel ingot
Assignee: Centre de Recherches Metallurgiques CRM ASBL
•
Filing: 1968-05-24
•
Granted: 1971-08-03
•
Expires: 1988-05-24
Abstract
Abstract A physical and/or chemical parameter, the development of which is connected with that of the rimming of an ingot, is measured while the major part of he gases issuing from he ingot in the course of the rimming process escape freely, practically without being disturbed, and while the molten steel has free access to the oxygen of the surrounding atmosphere. The curve representing the variation with time of the value measured is plotted, from which it is possible to obtain indications regarding the development of rimming.
Inventors
- 👤 Robert Alfred Pirlet
- 👤 Roland Holper
- 👤 Leon Jean Philippe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:08
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/44; G01N29/46; B; B22; B22D; B22D2/00; B22D7/00; G01N29/02; G01N29/024; G01N29/22; G01N29/223; G01N29/24; G01N29/2418; G01N29/50; G01N33/00; G01N33/20; G01N33/202; G01N33/2022; G01N33/2025; G01N2291/00; G01N2291/02; G01N2291/024; G01N2291/02433; G01N2291/025; G01N2291/0252; G01N2291/10; G01N2291/106
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A method of monitoring the progress of rimming of a steel ingot, comprising the steps of continuously measuring the intensity of thermal radiation emitted from a region located just above the surface of the steel, by means of a cell sensitive to thermal radiation, the major part of the gases evolved during rimming escaping freely, the upper surface of the molten steel having free access to the oxygen of the atmosphere; continuously transmitting a signal representing said intensity to a graph generator; and tracing a graph of the signal against time, whereby a curve is obtained representing the progress of rimming of the steel ingot.
Claim 2
Independent Claim
105 words
A method of monitoring the progress of rimming of a steel ingot, comprising the steps of continuously measuring the intensity of thermal radiation emitted from a region located just above the surface of the steel, by means of a cell sensitive to thermal radiation, the major part of the gases evolved during rimming escaping freely, the upper surface of the molten steel having free access to the oxygen of the atmosphere; continuously transmitting a signal representing said intensity to a graph generator; and tracing a graph of the signal against time, whereby a curve is obtained representing the progress of rimming of the steel ingot.
Claim 3
Dependent Claim
100 words
A method as claimed in claim 1, including the steps of carrying out the continuous measuring step for each of a plurality of ingots during rimming, graphing the measurement against time during rimming of each ingot, relating the curves obtained to variables known to influence the progress of rimming and to the quality of the ingots obtained, carrying out the continuous measuring step for a further ingot during rimming, graphing the measurement against time during rimming of said further ingot, and comparing the curve obtained for said further ingot with the curves related to said variables and said ingot quality.
Claim 4
Dependent Claim
38 words
A method as claimed in claim 1, including during teeming of the ingot, selectively measuring the intensity of thermal radiation emitted by the teeming jet to determine the moment at which the jet ceases to affect said curve.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 3, including automatically starting the tracing step on cessation of thermal radiation due to the teeming jet.
Claim 6
Dependent Claim
93 words
A method as claimed in claim 1, wherein the measuring step comprises i. receiving the thermal radiation by means of a first cell sensitive to thermal radiation; ii. arranging a second cell substantially similar to the first cell at a position adjacent to the first cell; iii. shielding the second cell from the thermal radiation emitted from the region located just above the surface of the steel; and iv. transmitting the output of the first cell and the output of the second cell to a comparison circuit providing the signal representing the intensity.
Claim 7
Dependent Claim
57 words
A method as claimed in claim 1, including carrying out the measuring, transmitting, and tracing steps for a plurality of ingots, and when the curve obtained for a given ingot is unsatisfactory, modifying at least one of the variables known to influence rimming so as to cause curves obtained for succeeding ingots to approach an ideal curve.
Claim 8
Dependent Claim
108 words
Apparatus for monitoring the progress of rimming of a steel ingot, compriSing a. means for measuring the intensity of thermal radiation coming from a given region, the measuring means including a cell sensitive to thermal radiation and means for restricting the field of observation of the cell; b. a graph generator connected to the output of the measuring means, to trace a graph of the intensity measurement against time; c. a thermal radiation detector for sighting a teeming jet, having a field of observation narrower than said cell; and d. a relay controlling the graph generator, the relay being connected to the output of the thermal radiation detector.
Claim 9
Dependent Claim
108 words
Apparatus for monitoring the progress of rimming of a steel ingot, compriSing a. means for measuring the intensity of thermal radiation coming from a given region, the measuring means including a cell sensitive to thermal radiation and means for restricting the field of observation of the cell; b. a graph generator connected to the output of the measuring means, to trace a graph of the intensity measurement against time; c. a thermal radiation detector for sighting a teeming jet, having a field of observation narrower than said cell; and d. a relay controlling the graph generator, the relay being connected to the output of the thermal radiation detector.
Claim 10
Dependent Claim
36 words
Apparatus as claimed in claim 7, wherein the observation field restricting means comprises a divergent horn of rectangular transverse section, the longitudinal axis of the horn coinciding substantially with the radiation reception axis of the cell.
Claim 11
Dependent Claim
120 words
Apparatus as claimed in claim 7, wherein the measuring means comprises i. a first cell sensitive to thermal radiation; ii. means for restricting the field of observation of the first cell to a given region; iii. a second cell substantially similar to the first cell; iv. a shield protecting the second cell from thermal radiation coming from points in the field of observation of the first cell; and v. a comparison circuit connected to the output of the first cell and the output of the second cell to provide a signal proportional to the difference between the signals received from the outputs of the first and second cells, the output of the comparison circuit being connected to the graph generator.
Claim 12
Dependent Claim
56 words
Apparatus as claimed in claim 9, wherein the comparison circuit comprises a Wheatstone bridge circuit, the output of the first cell being connected in one arm of the bridge, the output of the second cell being connected in the other arm of the bridge, and the graph generator being connected in the diagonal of the bridge.
References Cited (Backward Citations)
US2303655A
Cited
US2653471A
Cited
US2582232A
Cited
US3186232A
Cited
US3286098A
Cited
US3283562A
Cited
US3432288A
Cited
US3442124A
Cited
US3483378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |