Urgency of master's work

                Modern automatic systems of control by engineering processes demand a great deal of measurement instrumentation variety, which provides elaboration of measuring information signals in a form, convenient for telecommuting, data collection and further transformation, for elaboration and representation. Temperature is a major parameter of metal manufacture engineering processes. That’s why quality of temperature test provides the success of production process quite frequently.

                In this connection, an important purpose appears to be exploitation of foolproof methods of temperature measuring, creation of accuracy requirement, stability and velocity, investigations of influence on measuring results of all collection of factors, which attend measuring process.

Enumeration of current task

Theoretical analysis

                We will consider the principle of continuous casting machine’s operation on example of curvilinear machine, which structural layout is shown on Fig.1. Liquid steel from the casting ladle enters the tundish ladle (1), which is intended for lowering and stabilization of ferrostatic pressure and dynamic head of current, skimming and temperature stabilization before the mold. Tundish ladle also spreads metal into molds, depending on number of streams. Further, steel gets to the water-cooled mold (2), where initial forming of ingot takes place. Seed is introduced into the mold before casting beginning. Ingot had been formed in, with the nardening crust gets to the secondary cooling zone(3), where the further cooling is carried with the help of water sprayers. For ingot protection from bulking, a secondary cooling zone (SCZ) with special backup system as rolls, skids is equipped. Then ingot passes over the withdrawal-roll set (4) and is taken to the tool zone (5).

Figure 1 – General view of curvilinear casting machine

System simulation

                The simulator can be realized with the help of Mat LAB application package. Master inputs appears - temperature of pouring out steel, casting rate, intensity of flow cooling in the secondary cooling zone, withdrawal rate. Characteristics of the desired regime, are characterized in the following way: 1) temperature of ingot surface supposed to be reduced uninterruptedly in the SCZ right up to the end of the consolidation moment; 2) temperature of ingot surface in the end of the consolidation zone supposed to be lower than 900°C; 3) it’s advisably to soften the cooling regime and block out of the cooling water shortly to the end of crystallization process throughout the section.

                Regulation circuit of cooling water flow consists of actuating mechanism, ingot, temperature transmitter (pyrometer), and is shown in Figure 2.

Figure 2 - Block diagram of the cooling water flow control

                After simulation we receive transient (fig.3).

Figure 3 - Simulated results

                Simulation of the process allows to optimize cooling water flow and to increase unit capacity.

Conclusion

                Developed automatic system of cooling of uninterruptedly-casted ingot, is oriented on representation of plant work in automatic regime and in adviser regime with recommendations delivery. Block diagram allows to realize simulation of storage consolidation in item involved and use it for receiving operation factors in future. Received process visualizes the process of optimal ingot cooling, on the basis of which we can analyze it’s state.