Papers by Author: Jian Zhang

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Authors: Horst Meier, O. Dewald, Jian Zhang
Abstract: This paper describes a new sheet metal forming process for the production of sheet metal components for limited-lot productions and prototypes. The kinematic based generation of the shape is implemented by means of a new forming machine comprising of two industrial robots. Compared to conventional sheet metal forming machines this newly developed sheet metal forming process offers a high geometrical form flexibility and also shows comparatively small deformation forces for high deformation degrees. The principle of the procedure is based on flexible shaping by means of a freely programmable path-synchronous movement of the two robots. The sheet metal components manufactured in first attempts are simple geometries like truncated pyramids and cones as well as spherical cups. Among other things the forming results could be improved by an adjustment of the movement strategy, a variation of individual process parameters and geometric modifications of the tools. Apart from a measurement of the form deviations of the sheet metal with a Coordinate Measurement Machine rasterised and deformed sheet metals were used for deformation analyses. In order to be able to use the potential of this process, a goal-oriented process design is as necessary as specific process knowledge. In order to achieve process stability and safety the essential process parameters and the process boundaries have to be determined.
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Authors: W.L. Wang, K.J. Liao, Jian Zhang, P. Yu, G.B. Liu
Abstract: In this paper, the optical properties and structure of CdS films were investigated by SEM, X-ray diffraction, and x-ray photoelectron spectroscopy. The CdS films in this study were deposited on the plane transparent glass by chemical bath deposition technique. The experimental results have shown that the annealing treatment has an important effect on the optical properties and structure of CdS films. This may be ascribed to decreasing surface contaminations and oxide content in the films.
3721
Authors: De Lin Sun, Jian Zhang, Jiao Lee, Qiu Xiang Zhou, Wen Sun, Ming Gu Xun Cemaati, Qian Zhang, Hong Dan Li
Abstract: This research propose that it guide by the ministry of education Undergraduate teaching engineering and professional comprehensive reform spirit, with the new concept cooperation education, collaborative innovation, and common development , to break institute of professional disciplines and barriers, to build the school discipline professional cooperation, outside the school and enterprise cooperation new mechanism, to carry out mode for cultivation of diversified informationized innovative and entrepreneurial talents research and practice, to promote reform and innovation of personnel training mode, to cultivate the new thinking of information technology innovation entrepreneurship diverse talents.
1626
Authors: Yong Zhang, Jian Zhang, Hui Yu Wang
Abstract: The wireless network technology can achieve harmony and coordination of residential environment, this paper studies the smart home system energy saving control system design, system design ensures the correct transmission of data in the system of communication protocols. This class smart home smart home system using traditional control technology and system improvements made, there is a certain degree of intelligence programs home improvement, cost, and power consumption is significantly reduced, improving the accuracy of the data transfer for the establishment of a targeted communication conflict-free data transmission protocol, and ultimately achieve intelligent energy control.
1333
Authors: Horst Meier, V. Smukala, O. Dewald, Jian Zhang
Abstract: This paper describes a new development of an incremental, robot based sheet metal forming process for the production of sheet metal components for limited-lot productions and prototypes. The kinematic based generation of the shape is implemented by means of two industrial robots, which are interconnected to a cooperating robot system. Compared to other incremental sheet metal forming machines this system offers a high geometrical form flexibility without the need of any workpiece dependent tools. The principle of the procedure is based on flexible shaping by means of a freely programmable path-synchronous movement of two robots. So far, the final shape is produced by the incremental infeed of the forming tool in depth direction and its movement along the contour in lateral direction on each level. The counter tool, with its simple geometry, was used to support the sheet metal on the backside by moving synchronously along the outer contour, constantly on the same level. This corresponds to a fixed backplate used in other incremental sheet metal forming processes. Due to the use of a new robot system with extended control algorithms for cooperating robots, it will be possible to release the counter tool from its constant path on the outer contour and support the forming tool right on the opposite side of the sheet to generate a predefined gap between the two hemispherical tools. This way at each moment a small part of a full die, as it is used in other processes, is simulated without the need of producing a workpiece dependent die. The extended payload of the new robot system gives the opportunity to form steel blanks, for the first time.
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