Abstract
Blank holder force (BHF) control is used to prevent wrinkles of sheet metal in deep drawing process. Based on a novel conception of BHF control technique driven by servo-motor, a new BHF device with six-bar linkage mechanism has been designed and manufactured. Whole control system of the new BHF technique was developed, and the basic structure of the hardware configuration of the system was given. Software analysis, implementation and division of the functional modules have been done. Also, the control software in data acquisition and processing module has been developed in the relevant technology of the BHF control system for the requirements of real-time, stability and accuracy. By the new BHF device combined with the hardware and the software system, the BHF can be regulated accurately variation with the predefined BHF profile in deep drawing process.
Highlights
In deep drawing, the blank holder plays a role in regulating the metal flow and when the blank holder forces (BHF) selected properly, it can eliminate wrinkles and delay fracture in the drawn part
Based on a novel conception of Blank holder force (BHF) control technique driven by servo-motor, a new BHF device with six-bar linkage mechanism has been designed and manufactured
BHF control system mainly consists of an industrial personal computer (IPC), a motion controller, programmable multi-axis card (PMAC), an AC servo drive and a motor made of Yaskawa, a force sensor, an optical grating, an on-off control, some I/O ports and power units and other components, which is a closed-loop control system (Figure 4)
Summary
The blank holder plays a role in regulating the metal flow and when the blank holder forces (BHF) selected properly, it can eliminate wrinkles and delay fracture in the drawn part. As a result of large transmission ratio and easy to control, hydraulic transmission is used to implement the variable BHF profile control system [7,8,9]. Because of their size and complexity, slow response time, control accuracy, and high energy consumption, the hydraulic systems are not suitable for precision, numerical control, flexibility and other requirements in the process of forming. In this paper, according to the BHF control technique based on servo motor driven and the requirements for the BHF in deep drawing process, a whole control system, and its hardware and software have been designed. In the open-CNC technology, the computer is a platform of hardware and software of numerical control system, the motion controller is a key component to control the servo motor and the BHF actuator, so that the blank holder would follow certain movement trajectory, to ensure reasonable BHF profile or other predefined one
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