A temperature control method for metal rolled pieces in a hydraulic tension warm rolling mill

Abstract

The invention discloses a method for controlling the temperature of a metal rolled piece of a hydraulic tension warm rolling mill, which belongs to the technical field of a hydraulic tension warm rolling mill. The present invention adopts a double transformer heating method; the length and thickness of the heated rolled piece are constantly changing during the rolling process. Due to the constant change of its resistance, the simple PID temperature controller cannot meet the temperature control accuracy requirements under such complex conditions, and it is necessary to design a special feedforward controller and adopt special control means to realize temperature control; the present invention is different from the traditional single transformer Compared with the heating method, it avoids the disadvantages of ineffective heating caused by energization during the rolling process. Through the calculation of the length and thickness of the rolled piece, the combination of the feedforward controller and the feedback controller is used to realize the heating of the rolled piece during the rolling process. And temperature control, fully able to meet the requirements of the rolled piece, especially the metal thin strip, to maintain temperature uniformity during the rolling process.

Description

technical field [0001] The invention belongs to the technical field of hydraulic tension warm rolling mills, and particularly relates to a temperature control method for a metal rolling piece of a hydraulic tension warm rolling mill. Background technique [0002] The working principle of the hydraulic tension warm rolling mill: clamps are installed on the two tension hydraulic cylinders arranged on the left and right sides of the warm rolling mill. The hydraulic cylinder applies tension to the rolling piece, and the rolling piece between the two clamps is heated by means of resistance heating with low voltage and high current. During the rolling process, the two tension hydraulic cylinders maintain constant tension and the rolling piece is kept at a constant temperature. [0003] The existing rolling stock heating methods are divided into two types: single-transformer heating and dual-transformer heating. [0004] (1) The heating method of a single transformer is to use the...

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Problems solved by technology

The advantage of this method is that the roll gap of the warm rolling mill can be opened during heating, but the disadvantage is that the rolled piece can only be heated after the warm rolling mill stops, and it cannot be heated during the rolling process, which is not conducive to ensuring the temperature uniformity of the metal sheet

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