| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 92 === Servo presses are the manufacturing equipments resulted from the need of the recent precision manufacturing and the current automatic producing for high-tech electronic products. The slider of the servo press can perform various processes by digital servo control. Here we apply the concept of variable-input-speed for finding the suitable kinematic functions for the various requirements of sheet-metal forming processes for servo presses that are driven by ball-screw-mechanisms. The dynamic requirements are considered for the application of the variable-speed ball-screw-mechanisms on the servo presses. Firstly, the introduction of servo presses and ball-screw-mechanisms is presented. Then, the functions of the kinematic relationship between the input link and the output link of the ball-screw-mechanisms are derived. And, the functions of desired input torque and the input power are derived. Then, the minimum input power of the slider is selected as the objective function for designing the desired input speed trajectories that satisfy the specific kinematic and dynamic specifications. Finally, a prototype “Servo-Ball-Screw-Mechanism” is built and tested. The results show that the derived input speed trajectories also can be applied to ball-screw-mechanisms such that the direction of the input link is reversed. And, the various characteristics of the output motion of ball-screw-mechanisms can achieve high speed dropping, uniform processing, and extending the retention period of the low dead center of servo presses.
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