The Research Of The Growth And Control System Of Refractory Metal Based On The Floating Zone-Melting Method

Refractory metal has been used widely for electron, electric, machine, meter, manufacture, nuclear-powered industry and all kinds of high-tech research domain. Based on wide use and essentiality in the market, advanced computer control technology is used for single crystal of refractory metal in this paper, a full project of growth and control system of single crystal of refractory metal is brought forward, which is switched between manual mode and automatic mode.At first, this paper introduces simply the characteristic of refractory metal. Then this paper expatiates respectively development foreground of refractory metal in some domain now, such as the function material, the electron information material, the energy sources material, the structure material, the rising material and so on. And combing with the development history and status in quo of growth tech of single crystal of refractory metal, this paper brings forward the research meaning of this project. This paper discusses some kinds of growth technology of actual refractory metal in detail, and summarize that the most perfect technology of single crystal growth of refractory metal by compare is floating zone-melting tech by electron bundle. Based on it, this project designs the corresponding machine structure and brings forward double closed loop control with the velocity control and the position control. According to the practical measure demand, this paper presents the model of servo and grating which both satisfy control the system demand, and presents the circuit principle drawing of the hardware control.In this system, the PC-based DMC-1842 motion controller is used as the superior control unit, the 12A8 model direct current servo system which was produced by the U.S. AMC company and the direct current servo motor which was produced by Beijing YongGuang company is used for the execute element, the rotation motion of motor is changed to the rectilinear motion by the guide screw nut, the measure velocity machine which is the appurtenance of the direct current servo is the speed examination part of motor, the optical grating is the position examination part of linear motion, all of these make up of a double closed-loop synchronous motion system with four axes. Regarding these, this article describes the makeup, the essential technology and the classification of the motion control system, and analyzes the method of the motion control system. This paper introduces the characteristic of the motion controller, designs the correlative hardware circuit and actualizes the numeral control system of PC-based and the motion controller, regarding the design demand of the control system. Based on that, this paper uses the VC++ 6.0 language to compile the software control procedure.The item combines the theory research with the practice exploitation, realizes successfully the machine design and the control for the single crystal growth equipment of the refractory metal, and offers an important reference for the crystal growth of else material. According to the universal of the hardware control, the research of this item has the definite guidance meaning for the exploitation of any single crystal growth equipment.