Papers by Author: Guang Qi Cai

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Authors: Guang Qi Cai, Tao Jin, B.F. Feng
Authors: Jin Sheng Wang, Jia Shun Shi, Ya Dong Gong, G. Abba, Guang Qi Cai
Abstract: In this paper, a micro milling model is brought forward. The influences of different metal phases and the minimum chip thickness are considered in the model. The cutting forces and the surface generation in the micro milling process are predicted. Through the experiment validation, the results correlate to the model very well.
Authors: Ji Man Luo, Guang Qi Cai, X. Chen, B.J. Yang, W. Huang
Abstract: In this paper, based on some disciplinarians about the configuration design of Parallel Robot Mechanisms (PRM), the theory bases was established for parallel structural configuration design by developing different types of the partly degrees of freedom (DOF) parallel configuration designs. The new method to synthesize the partly DOF parallel mechanisms, called constraint accession, is provided to the classification of kinematical chains by use of screw theory. The active kinematical chains control the necessary DOF and the passive kinematical chains control the needless ones. In this paper, the relevant active and passive kinematical chains are put forward and the constraint chains are classified in detail. It is demonstrated by an example that new configurations can be obtained by assembling different kinematical limbs.
Authors: B.F. Feng, Hong Shi, Guang Qi Cai
Abstract: Kinematics, workspace, dynamics behavior of a 3-DOF 3-Legged parallel robot with horizontal slide 3-link for steel snagging, which was developed by Northeastern University, are introduced. The steel spot snagging experiments have also been carried out. The wheel selection, removal rate, grinding power and their influence factors are studied. Comparing with hanging grinders used in most steel mills of our country, this robotic grinder can reduce labor intensity of workers, raise efficiency and guarantee quality greatly.
Authors: Xiang Zhi Meng, Jia Shun Shi, Guang Qi Cai, Ming Hu, X. Chen
Authors: Xing Shan Li, Jun Wang, Guang Qi Cai
Abstract: This paper proposes a novel three degrees of freedom parallel machine tool. The parallel machine tool consists of three serial chains and a fixed base and a moving platform which can be moved in a pose space corresponding to the three degrees of freedom. By using matrix methods, a error model of the parallel machine was developed. The explicit solution of the error of joint and the stroke error of telescopic link were solved for analysis of influence factors of error on the position of moving platform. It provided a theoretical foundation for error compensation of parallel machine tool.
Authors: R. Cai, H.S. Qi, Guang Qi Cai
Abstract: Wheel structure has a critical influence on grinding performance especially active cuttingedge density. Experiments were carried out to find out the relationshipbetween active and staticcutting edge density. It was found that there are many more active cutting edges in grinding thanexpected based on chip thickness formulae mainly due to wheel deflection in grinding.
Authors: Chang He Li, Guang Qi Cai, Shi Chao Xiu, Feng Liu
Abstract: Surface microcosmic topography finished by abrasive jet with grinding wheel as restraint was analyzed and evaluated. Generating mechanism of surface morphology finished by abrasive jet with grinding wheel as restraint was investigated and surface topographical characteristics were also evaluated with cross correlation of random process. Experiments were performed with plane grinder M7120 and workpiece material 45# steel which was ground with the surface roughness values of Ra=0.20.6m. The machined surface morphology was studied using SEM and microscope and the microcosmic geometry parameters were measured with TALYSURF5 instrument. The experimental results shown that the machined surface change from continuous and parallel micro-groove and plough to randomly discontinuous micro-pit can be observed with machining circles increasing and surface roughness was obviously improved. Furthermore, The finished surface has little comparability compared to grinding machining surface.The isotropy surface and uniformity veins both parallel and perpendicular machining direction were attained by abrasive jet precision finishing with grinding wheel as restraint.
Authors: Liang Zhao, Ya Dong Gong, Guang Qi Cai
Abstract: The stiffness model of the parallel machine tool is established by static analysis, the static stiffness analysis is carried out through numerical Simulation and the stiffness distribution is given. On the basis of this, the optimal objective is given which is the average of 729 values of -axis stiffness and -axis stiffness corresponding to 729 positions in the workspace. With MATLAB software, the effects are simulated which the structural parameters of the parallel machine tool have on their stiffness, their change rules are gained, and this provides a basis for the structural design of this type of machine tools.
Authors: Ya Dong Gong, H. Li, Guang Qi Cai
Abstract: There’s a systemic exoteric analysis and experiment study about the distribution of Ultra-speed grinding airflow field and influence factors in this paper and lots of experiments has been done in different conditions by the method of PIV (particle image velocity). A great deal of data has been gathered and the method dealing with it by using the software such as FlowMap, Tecplot and Matlab has been brought forward. Experiment and measure have been done under different conditions and lots of experiment data and results have been obtained. Many kinds of general rules influenced by factors on Ultra-speed grinding airflow field by the analysis of the experiment results, for the purpose of supporting the base of study for the effective supply of cooling and lubrication liquid.
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