VBHF System Research Basing on the Technology of Fuzzy PID Control

ABSTRACT

High precision in sheet metal stamping parts is required to control springback in sheet metal process; however, how to accurately predict and control the springback is a scientific problem for high-performance precision manufacturing. VBHF (Variable blank holder force) technology is an effective measure to control the springback of sheet metal, and the realization of the variable blank-holder force system is a difficulty. VBHF system mostly controls the flow of servo valve to control the pressure of ejection cylinder so as to control the blank-holder force. The stability and realtime factors are influenced greatly by the precision of the valve and the control current instantaneous changes. This paper quotes PID control module based on the technology of fuzzy to control the VBHF. Its principle is based on PID controller to add a fuzzy control module. Application of virtual instrument LabVIEW software incorporates the operating system and real-time data acquisition system. Through parameter, adjustment can meet the system's rapid, stable and robust requirements.

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