| Controlled cooling after rolling is widely used in high speed wire production line. Compared with natural cooling, it can not only improve cooling rate and reduce oxidation loss, but also guarantee the product quality. In the controlled cooling process, laying temperature is the key parameter which influences the product properties. The laying temperature control model is studied widely by researchers. The finite difference method is used in on-line control model, replacing the semi-analytic and semi-empirical formulae. The control precision of laying temperature is improved continually.The high speed wire plant of Shougang steel company was built in1987. The control method of water cooling segment is backward and control precision of laying temperature is poor, which can not meet the production requirement because the product properties are not stable. As a part of "water cooling system modification after rolling" project from Shougang high speed wire plant, the main aim of this study is to reach the target that the difference between average temperature of whole length and aim temperature is below±15℃at2σ level by enhancing the automatic control level of water cooling system, and improving the control precision of laying temperature.On the basis of study controlled cooling system of worldwide high speed wire production line, the heat transfer model of water cooling is built by using finite difference method. The heat transfer coefficients of different steel grade are evaluated. According to the situation of high speed wire production line of Shougang, the control system of cooling is designed and the level-two system function module of water cooling is developed. The cooling system after rolling is debugged. The precision of model is improved by self-adaptive calculation through measured datas.The control system of water cooling after high speed wire rolling runs steadily. The precision reaches the design target. |
PDF Full Text Request