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| Vehicle control system |
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| Procedure for the thermal treatment of powdered and granulated catalysts and the like |
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Alloying system and heating control device for high grade galvanized steel sheet
| Details |
Inventors: Wada, Kozo; Hirai, Etsurou; Tsurusaki, Kazuya; Asahara, Yuuji; Han, Kwang-Hee; Lee, Jae-Young; Cho, Noi-Ha; Shim, Jang-Sub; Chun, Si-Youl;
Assignee: Mitsubishi Heavy Industries, Ltd. (Tokyo, JP)
Primary Examiner: Hoang; Tu Ba
Assistant Examiner:
Attorney, Agent or Firm:
An alloying system for a galvanized steel sheet, using an induction heating coil, wherein the temperature of the steel sheet in an induction heating furnace is measured based on the impedance of a high frequency heater, and the amount of heating is controlled by feedback, to form an alloy layer of the steel sheet. |
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DETAILED DESCRIPTION The present invention has been accomplished in the light of the above-described problems.
An object of the invention is to provide an alloying treatment system, etc.
for a galvanized steel sheet, equipped with means by which the steel sheet temperature of a heating furnace can be accurately grasped to supply an appropriate heating temperature necessary for the formation of an alloy layer of the galvanized steel sheet by use of an induction heater.
To attain the above object, the constitution of the present invention is characterized by: 1) Involving a method which measures impedance on a load side as viewed from a high frequency power source to calculate the resistivity of a material to be heated, and which, based on the values of the relevant properties, detects the accurate temperature of the material to be heated.
2) Involving a heating temperature control method which measures the impedance on the load side as viewed from the high frequency power source to calculate the resistivity of the material to be heated, thereby making it possible, based on the values of the relevant properties, to detect the accurate temperature of the material to be heated, and to obtain an appropriate temperature.
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