Simulation Analysis And Control Study On Hydraulic Systems Of Large-capacity Electroslag Furnace

Electroslag Remelting (ESR) is an important special metallurgical methods. It is used in the production of national defense industry and civilian industry important parts. After the electroslag refining,high purity steel with compact organization need not the surface processing basically. Furthermore, ESR can easily produce titanic ingots, meeting the requirements of large forgings in industrial production. Increasing capacity of electroslag furnace makes a lot of control problems for the concerns of engineers and technicians.Transmission system is indispensable part of the equipment,which is responsible for the implementation of power transmission components from the prime mover. In the ESR process, as with the melting, the electrodes continue to shorten while the steel ingot increases gradually. In order to ensure the stability of melt-speed and current settings the electrode height needs to be adjusted in real-time. At the same time, the distance between the metal surface and the bottom electrode directly determining the value of the slag resistance, in order to ensure the power entering the slag pool, the electrode position with the mold needs to be adjusted to stabilize the melting current as well. It is a good choice to use the hydraulic system with low inertia and high ratio power as transmission control system to ensure the location parameters rapid adjustment and accurate positioning.Large-capacity electroslag furnace to drive a large load, this increases the inertia of the system, moreover in precise adjusting the parameters, the system will have a negative load interference. In addition, the proportional valves have large zero dead zone in order to reduce manufacturing costs. When the system stability has been ensured, meanwhile, how to balance speediness and accuracy is the issue of in-depth study in this paper.Simulation studies through a variety of control algorithms have shown that fuzzy control of the non-overload basically, short response time, is better than conventional PID. In this paper, fuzzy self-tuning PID and PID compound control are chosen by Switch Module. PID application can make the system with great deviations quickly close to a given position. Fuzzy self-tuning PID control is applied to improve accuracy when the systematic deviations become smaller. This can reduce the online calculation and automatically adjust control parameters which have greatly improved dynamic performance.