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Zhao S.-Y.,Yanshan University | Jin M.,Yanshan University | Fan Y.-Q.,Yanshan University | Guo B.-F.,Yanshan University | Zhao X.,CFHI Dalian Design and Research Institute Co.
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2015

In this paper, taking the cylinder of the double spherical hinge middle lever structure of the large free forging hydraulic press as a example, the experiment apparatus is designed with the scale of 1∶10. With the effect of different eccentric load, the experiments for testing the side thrust between piston and guide sleeve were conducted by changing length of middle levers and radius of spherical hinges. Under the conditions of different contact positions of guide sleeve and piston, the influence rules of middle lever's length and spherical hinge's radius on contact force and side thrust were released. Beside, combined with the design factors of actual project and considering influential factors of side thrust and contact force, the criteria ensuring length of middle levers and radius of spherical hinges were put forward. When designing the double spherical hinge structure of hydraulic cylinder, the length of the middle lever should be 0.64~0.81 times of piston's length, the radius of spherical hinge should be 0.48~0.57 times of piston's diameter. And if the piston is under greater eccentric load, or the movable crossbeam is often working in a higher position, both values should be lower limit as far as possible. The bases for designing hydraulic cylinder of double spherical hinge structure were provided by the results. ©, 2015, Beijing Res. Inst. of Mechanical and Elec. Technology. All right reserved. Source


Song Q.,Yanshan University | Song Q.,CFHI Dalian Design and Research Institute Co. | Guo B.,Yanshan University | Li J.,CFHI Dalian Design and Research Institute Co.
International Journal of Advanced Manufacturing Technology | Year: 2013

An efficient drawing mode for heavy servo press was proposed with four sections which are defined on the whole slide motion stroke. Four key control points, which represent the requirements of drawing process, were employed to realize the eccentric drawing motion profile planning. To reduce the power requirement of the servo motor, a flexible acceleration and deceleration control algorithm was proposed, and the eccentric motion profile of the servo press was constructed based on the algorithm. Then, the optimization model of the drawing eccentric motion profile was established to maximize the production rate, taking into account all boundary conditions including the maximum velocity and acceleration of slide, the space and time limit of feeder, the torque and thermal limit of servo motor. This optimization model was solved by the combination of the penalty function and the complex method, which need the least time. The program of the drawing motion profile optimization was developed and applied on a 2,500 t servo press. Finally, the experimental validation of the body side panel drawing was carried out. The results show that the proposed efficient drawing mode and the optimization method could obtain the optimal motion profile and the maximum production rate. This research provides the theoretical foundation and optimization method for the drawing motion profile optimization design for heavy servo press. © Springer-Verlag London 2013. Source

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