Design And Simulation Of Actuator Of Blank Holder Force Control By Servo Motor Direct Drive

Nowadays, NC technology has already been widely applied in the mechanical manufacturing industry. It is an inevitable tendency that this technology will be used in the prototype manufacturing field. The BHF control method driven by the servo motor can change according to the preset stroke curve. In this way, the BHF in the deep drawing process can be controlled precisely. This BHF control method can better agree with the requirement of deep drawing craft and it can also promote and perfect the basic theory research of the deep drawing technology based on experimental techniques. Both of the above two aspects embody the forming idea which is"more refined, faster and cheaper".A new type of servo binder mechanism has been designed by the control principle of the BHF driven by the servo motor. The BHF executive mechanism directly driven by the servo motor can be used in the experiment and the actual production. The main part of which takes advantage of the six-bar linkage having non-uniform transmission ratio. The relationship between input and output has also been calculated, which helps to ascertain the bars dimensions. The strength and stiffness of the part were checked by FEA method. The travel of the servo binder mechanism is 130 mm and can realize the BHF of 200 kN , which meets the design requirements.In order to analyze the working condition of the BHF executive mechanism directly driven by the servo motor and feasibility of the control method of the BHF, executive mechanism was analyzed by virtual prototyping. By means of virtual simulation of the BHF control system under different BHF it has been verified that the BHF control system comprising six-bar linkage and servo motor can meet the need of BHF in the deep drawing process. Simulation of the motor torque under different BHF verifies the force increasing characteristics of this binder mechanism. Analysis shows that the motor of power of 1.8kw can meet the design requirements. As a result, this mechanism can reduce the demand for the servo motor performance and help to realize the design concept of low energy consumption.The control program and man-machine interface have been written in the VC++ 6.0 environment. The BHF curve changing over time and real time data are displayed on the computer in order to find out the binder conditions in real time.