Time filter

Source Type

Wang Z.T.,Zhejiang University | Feng Z.L.,Ningbo Ruyi Joint Stock Co. | Chen S.M.,Zhejiang University | Xu Y.T.,Zhejiang University
Applied Mechanics and Materials | Year: 2014

Vertical high-speed feeding system which based on direct-drive technology possesses unique advantages, and has broad development potential. This paper describes the mechanical structure and working processes of vertical high-speed feeding system, analyzes the punching force and deformation of sheet metal, then establishes the dynamic equations, and finally conducts a dynamic simulation of punching stage and returning stage. And the simulation results in line with expectations. © (2014) Trans Tech Publications, Switzerland. Source

Fu J.,Zhejiang University | Ding Z.,Zhejiang University | Xu Y.,Zhejiang University | Xu Y.,Suzhou Zijingang Intelligent Manufacturing Equipment Co. | And 2 more authors.
Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering | Year: 2014

As the core component of contact measurement mechanism, double-reed guide mechanism is widely used in automatic detection, and its transfer error modeling directly affects the measurement accuracy of the sensor. The overall flexibility modeling of cantilever beam is adopted in traditional modeling methods, which however, does not accord with the actual physical structure and can lead to greater transfer error in the measurement. In this paper, the overall mechanics model of the guide mechanism was established firstly, and then the cantilever beam segment modeling methods of flexibility-rigid-flexibility of reed mechanism was proposed. Based on this method, the reed force and the bending moment expressions were deduced, so that the parasitic rotational angle of translational board and the transfer error expressions were obtained. Finally, through the finite element simulation technology, the simulation experiments were conducted and the simulation results suggest that the transfer error of the cantilever beam segment modeling method of flexibility-rigid-flexibility was greatly reduced, compared with the overall flexibility modeling method of cantilever beam. Therefore, the model proposed in this paper is proved to be effective, and it also provides theoretical basis for design of double-reed guide mechanism, dynamic compensation of measurement accuracy and data processing. ©, 2014, Tianjin University. All right reserved. Source

Ningbo Ruyi Joint Stock Co. | Date: 2009-09-29

Hand operated hydraulic vehicles for carrying goods, namely, trucks.

Jiang J.H.,Zhejiang University | Ye G.Y.,Ningbo Ruyi Joint Stock Co. | Xu Y.T.,Zhejiang University
Applied Mechanics and Materials | Year: 2014

Because of its high dynamic response speed and acceleration, high rigidity and positioning accuracy, the permanent magnet linear synchronous motor (PMLSM) is able to meet the requirements of high-speed precision CNC machine tools. However, its thermal problems have seriously hampered its development. This paper establishes a PMLSM temperature field model, designs a cooling structure, determines the boundary conditions of the finite element model and conducts computer simulation of the model. The result shows that the designed cooling structure can effectively alleviate the motors thermal problems. © (2014) Trans Tech Publications, Switzerland. Source

Wang Z.,Zhejiang University | Feng Z.,Ningbo Ruyi Joint Stock Co. | Ye G.,Ningbo Ruyi Joint Stock Co. | Xu Y.,Zhejiang University | Fu J.,Zhejiang University
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2015

Aiming at the path planning problem of synchronous dual-robot welding process of the hand pallet truck frame main, the multiple traveling salesman problem (MTSP) was transformed into a traveling salesman problem (TSP) by introducing virtual points, and weld lines were encoded by transposition express. An artificial bee colony (ABC) algorithm was adopt to build a mathematical model of dual-robot synchronous welding based on a state transfer strategy, and an approximate solution of global optimal welding path was calculated by simulation. Then a simulation experiment with ABC algorithm was conducted and compared with the improved adaptive genetic algorithm and artificial fish swarm algorithm. The result shows that the ABC algorithm has a faster convergence speed. It possesses an essence of good repeatability, and can obtain a shorter welding time. The dual-robot path planning method based on ABC algorithm can deal with dual-robot simultaneous welding problem of the pallet truck frame effectively. ©, 2015, Harbin Research Institute of Welding. All right reserved. Source

Discover hidden collaborations