Design and implementation of the control system to vacuum diffusion furnace

This paper proposed the design proposal of the control system for vacuum furnace. The control system consist of a field bus control system (FCS) based on industrial control machine, PLC, intelligent PID instrument etc. The whole system realizes four closed loop controls of three sections of the furnace, which include temperature PID control, gas flow tracking control, Push-pull boat tracking control and furnace vacuum PI control. The upper computer programming software realizes the design of all kinds of control software by using the VB.NET and Access database, which mainly complete equipment monitoring and acquisition all kinds of real-time data of industrial production, control and monitor operation situation of lower computer equipment, store the history data of equipments, download/upload production process data and generate data curves and so on, and make the operation situation of whole process easier to control. Practice proves that the system is reliable operation and meets the demand of precision, and can completely replace the imported products.