Temperature control system for preparing semi-solid rheoforming slurry based on pulse-width modulation （PWM） was described

and working principle

working circuit of the system and structure and application of PWM control chip were analyzed. SiMo rod was adopted as heating unit. It is found that working current of SiMo rod is less than 200A （designed value） during temperature increases

holding temperature and temperature decrease process

realizing the goal of current-control. Temperature control system exhibits stability and non-oscillation in condition of disturbance

where constant temperature control is less than 0.5℃ and temperature fluctuation is in range of ±1℃

fully meeting requirements of heating for ferrous metal semi-solid more than 1500℃.