Nanocrystalline Alloy Magnetic Powder Induction Vacuum With Continuous Casting Equipment Control System Development

Inductive vacuum continuous strip casting device (hereinafter shortformed continued rapid solidification) is a high performance equipment to produce magnetic nanocrystalline powder of rare earth alloys (hereinafter shortformed high performance powder). The system adopts the techniques such as continued yielding, induction melting, ceramic filter filting, nozzle jetting,strip casting and rapid solidifying. Development of such devices is of high importance to the large scale production of high-stabilization, high-consistency magnetic powder.Highly automatic powder manufacturing equipment can satisfy the special technological requirements of powder production, realizing effective control of the content of minim element, crystallization temperature, surface structure, little oxygenation, uniformity and consistency of powder, ensuring the production of high-consistency high-performance magnetic powder.Nanocrystallin powder of rare earth alloys is advantageous at magnetic speciality, reliability and stability. It is widely applied in economical and military applications. Because the advanced equipment is the basis for production of high performance powder, many countries compitete intensively in this area. GE Co.,Ltd (USA) lead on this field. At present, research in this area becomes the hotspot.This thesis describes the control system design of continued rapid solidification based on induction in vacuum system. Based on the study of the relationships among different subsystems, the thesis analyzed and summarized the functionalities and characteristics of the subsystems: intermediate frequency induction alloys melting system, constant temperature tundish system, high frequency induction nozzle system, rapid solidification wheel variable frequency device VFD system, vacuum acquirement system,oxygen analsys system and cooling system. The control models of each subsystem are designed and the associated control system is built. The system HMI(Human/ Machine Interface), the system program and the electric control circuit are designed and implemented based on MCGS(Monitor and Control Generated System) , SIEMENS S7-300 PLC and DDC(Direct Digital Control).