The Study on Buffering Stiffness and Damping in Vertical lifting and Dropping Movements of Oscillating-Bar Forging Manipulator’s Clamping-Bar

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Journal of Vibration and Shock ›› 2013, Vol. 32 ›› Issue (9) : 105-109.

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The Study on Buffering Stiffness and Damping in Vertical lifting and Dropping Movements of Oscillating-Bar Forging Manipulator’s Clamping-Bar

YANG Jin1，HE Qi-gong2，TONG Xin-xing1

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Abstract

A thought of getting buffering stiffness and damping through dynamic-theory-based analysis, taking vertical lifting and dropping movements as an example is presented with making buffer device for the hydraulic cylinder and the accumulator of the oscillating-bar forging manipulator’s clamping-bar hanging system. A hanging system’s vertical lifting and dropping movement dynamical model is made with a simplified physical model of the construction of equipment and a analysis of vertical lifting and dropping movement’s potential and kinetic energy with Lagrange method. Taking 50KN forging manipulator as a example, the influence of buffer device’s stiffness and damping to hanging bar’s swing angle, workpiece centroid position, swing angle of clamping bar is given respectively through solving dynamic model in Matlab, and the stiffness and damping’s effect to the vertical lifting and dropping movement has been analyzed. A method of confirming buffer device’s stiffness and damping is made to give a theoretical basement to the design of oscillating-bar forging manipulator’s hydraulic cylinder and accumulator.

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forging manipulator / hanging system / buffer device / stiffness and damping

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YANG Jin;HE Qi-gong;TONG Xin-xing. The Study on Buffering Stiffness and Damping in Vertical lifting and Dropping Movements of Oscillating-Bar Forging Manipulator’s Clamping-Bar[J]. Journal of Vibration and Shock, 2013, 32(9): 105-109