Metal founding – Process – With measuring – testing – inspecting – or condition determination
Patent
1990-01-16
1991-07-02
Lin, Kuang Y.
Metal founding
Process
With measuring, testing, inspecting, or condition determination
164449, 164500, B22D 1118
Patent
active
050278851
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to an injection apparatus and an injection rate control method for injecting molten metal into a casting mold in a high-speed type thin plate continuous casting machine which can continuously cast into a thin strand at high speed.
In this type of apparatus, for example, thin steel plates having a thickness of about 40 mm are directly produced from molten steel, so that a process of manufacturing a steel plate can be rationalized. However, it is necessary to pull the strand out at high speed in order to increase the productivity (ton/hour) because the thickness of the strand is so thin.
The present invention relates to an injection apparatus and an injection control method for injecting molten metal into a casting mold in a thin plate continuous casting machine which can cast at high speed.
2. Background Art
Generally, in a continuous casting plant, it is important to keep a molten metal level constant within a casting mold, to stabilize the quality of a stand, especially to stabilize the trace in the surface of the strand, and to prevent the molten metal from overflowing in the casting mold and damage the plant. Therefore, in a conventional continuous casting plant, the molten metal level is controlled by detecting the molten metal level within the casting mold using a molten metal level sensor, such as a sensor utilizing the principle of electromagnetic induction, and adjusting the injection rate by moving a stopper filling a hole provided in bottom of a tundish up or down or by opening or closing a sliding nozzle.
In the aforementioned thin plate continuous casting plant, it is required to raise a pulling-out rate of the stand to five to ten times as much as in a general continuous casting machine to achieve production equal to the general continuous casting machine, because of the small cross section, as mentioned before. In that case, as fluctuation in the molten metal level in the casting mold is frequent and violent, it is required to control the level using an apparatus having quick response.
Therefore, development of a molten metal level detecting means and a injection rate control means which have far quicker response than a molten metal level sensor or injection rate control unit usually used, is required to realize a high-speed type thin plate continuous casting machine to which the present invention relates.
Various molten metal level detecting means having quick response have been proposed (for example, molten metal level detection using a light-sensitive element described in Examined Patent Publication (Kokoku) No. 62-52663 On the other hand, an injection rate control means to which the principle of electromagnetic force is applied, is promising as an injection rate control means having quick response.
Three kinds of systems, i.e., a direct current static magnetic field (electromagnetic brake) system, a current flowing (forced direct current plus direct current static magnetic field) system, and a linear motor (alternating current moving magnetic field) system are known at present. The present inventors grasped various characteristics of the three system through experiments, theoretical calculations, and literature, and compared and examined those characteristics. The present inventors then found that the linear motor is most suitable for the injection apparatus for a thin plate continuous casting machine.
The reason for the selection is as follows. In the direct current static magnetic field system, the molten metal cannot be accelerated and heating characteristics are not sufficient. In the current flowing system, the apparatus is large and complicated, and interferes with the operator's work. Furthermore, there is some anxiety regarding the safety of the system.
Researching prior arts relating to linear motors, Japanese Examined Utility Model Publication No. 44-17619 was found as a publication which discloses an application of a linear motor to a continuous casting machine. The publication discloses a technique where a tundish is divid
REFERENCES:
patent: 2743492 (1956-05-01), Easton
Fujisake Keisuke
Hashimoto Akira
Inaba Azumi
Kanai Noriyuki
Kashio Shigeki
Lin Kuang Y.
Nippon-Steel Corporation
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