Research On Melting Speed Control Strategy For Vacuum Arc Remelting Furnace

Vacuum melting speed control is the key to electricity arc smelting for acuum arcremelting furnace, directly related to product quality and yield.Considering the instability ofsmelting arc, strong coupling between arc voltage and arc current, and for vacuum arc furnacemelting speed control of large lag, nonlinear characteristics, this paper proposes strategy whichis "decoupling first, then control" on the melting speed control, it has great significance toachieve high quality, high efficiency of the melting speed controlIn this article, through analysis of parameters related to arc melting process and meltingspeed control, combined with the actual situation, melting speed control mathematical modelis established, based on the analysis of smelting arc structure and static and dynamiccharacteristics, in view of the coupling between arc voltage and arc current, studied a kind oftwo input-two output decoupling PID control strategy to implement of dynamic compensationfor system coupling. At the same time according to melting speed control model, to solve theexisting problem about delay, nonlinear, strong disturbance, etc. in the melting speed control,design a kind of controller based on fuzzy PID speed controller, through reasoning, knowledgebase, and the dynamic operation situation of the control system, using fuzzy inference, tocomplete the self-tuning of PID parameters, to achieve efficient control of electric arc furnacemelting speed, guarantee the stability of the vacuum smelting arc furnace.According to the fact condition, analysis the actual production data parameters such asmelting current and voltage, to determine that the strategy can effectively overcome theproblems arising from the melting speed control, to provide vacuum arc smelting furnacesystem efficient and stable control, and wide application promotion value. effec t.