Papers by Author: Tie Jun Wu

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Authors: Tie Jun Wu, Long Gen Li, Hui Yuan Cao
Abstract: Fixture is technological equipment which is able to determine the location of the workpiece accurately and clamp the workpiece steadily. A good fixturing scheme could help improve the quality of products. A new design algorithm of fixturing scheme based on RBR and CBR is developed. The appropriate parts feature information model is decided based on requirements of design of fixturing scheme. The rules of constraint of DOFs and the rules of fuzzy inference are used to determine the correctness of the scheme location of the workpiece according to requirements of machining dimensions and the geometry information. In the case library, some appropriate fixturing schemes are retrieved according to constraint DOFs. Their entire similarities of these appropriate fixturing schemes are figured out and ranked from high to low. The fixturing scheme with the highest similarity is modified and stored into the case library. This entire method makes the best of advantages of RBR and CBR to achieve automation of fixturing scheme. It could help the automation of CAFD. This method has higher practical value.
1847
Authors: Guo Hua Qin, Shi Ping Sun, Zhi Xiong Chen, Tie Jun Wu, Zhi Qiang Ao
Abstract: Multiple clamps are frequently used to serve the purpose of workholding in a fixture. So multiple clamping forces including their magnitudes, placements and application sequences, greatly influence contact forces and workpiece machining accuracy. In this paper, the impact of multiple clamping forces on workpiece location error is formulated analytically for a workpiece-fixture system. The proposed model takes into account the varying contact forces and friction force during entire clamping operation. It reveals that the historical accumulation of clamping steps influences heavily the final distribution of contact forces in the workpiece-fixture system. In addition, based on effect of contact forces from one step to another on workpiece location, a novel design model is presented to optimize the multiple clamping forces in order to minimize the workpiece location errors. Some numerical tests are finally demonstrated to validate the proposed model and approach.
619
Authors: Zhi Qing Wu, Tie Jun Wu
Abstract: This paper introduced a new design method for mechanical and electrical products,for example electric drill handle. By using Geomagic Studio Software, the cloud data about scanning electric drill was preprocessed, the three-dimension surface was reconfigured according to the preprocessed data, the surface reconstruction file was imported into UG Software for substantialization. Finally, the model was improved and optimized according to individual customer needs. Key words: Electric drill handle, Reverse engineering, Individual design
2746
Authors: Tie Jun Wu, Hong Bing Wu, Hong Bo Wang
Abstract: The determination of process route is a complex process and one of key techniques of computer-aided process planning. workpiece surfaces are classified. The machining element is determined and ranked according to rules of technological design. Finally, all the machining elements are reorganized and ranked with the comprehensive consideration of freedom constraints of workpiecesand technological equipment. The operation sequence is generated automatically.
1554
Authors: Tie Jun Wu, Hong Jun Wang
Abstract: The residual stress distribution of fillet of the diesel engine crankshaft on laser shock processing was analyzed by ANSYS software. The simulation results compared with the experimental data, to get results as follows: the simulation results were basically consistent with the experimental data. This fully proved that the finite element simulation method and related simulation parameters were correct. The parameters of laser impacting were optimized by ANSYS simulation, and the residual stress favorable distribution of the crankshaft fillet was obtained.
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