The Design Of Control System Of Vacuum Sintering Furnace Based On S7-300PLC

Hard alloy is made of an alloy material to molten metal and hard compound adhesive metal through powder metallurgy processes. Because of its high hardness, high strength, wear resistance, heat resistance, corrosion resistance and other properties are widely used in various mechanical, automotive, electronics, aerospace and other fields. This paper introduces the preparation method of cemented carbide, sintering furnace and auxiliary equipment of the structure and working principle and control strategy. According to the characteristics of sintering process, the selection of Siemens S7-300 PLC as the core controller, touch screen as man-machine interface, the implementation of automatic control of sintering process.Vacuum hot pressing sintering furnace is the key equipment in the production of hard alloy, mainly realizes the alloy powder pressing and sintering. The press pressure and sintering temperature must be in strict accordance with the production process of the products processed curve to control. Due to the dynamic characteristics of vacuum sintering furnace has the characteristics of nonlinear, time lag, it is difficult to establish accurate mathematical model, depending on the control algorithm in general difficult to achieve. Through the fuzzy PID control and parameter self-tuning fuzzy PID control simulation and comparison analysis, and ultimately determine the use of self-tuning fuzzy PID control algorithm, the silicon controlled voltage regulating heater automatic control, and achieved good control effect.The process of temperature, pressure, and other parameters monitoring system using KunLun state touch screen is developed for real-time monitoring and centralized management, set up a real-time curve, alarm, curve records and other functions, image, intuitive response the real situation of the production site.