Papers by Author: Xiao Zhong Deng

Abstract: To achieve the effect of anti-fatigue manufacturing for hypoid gear, the author put forward a new type cold rotary forging technology, the method simplifies the die structure and adopts the local line contact continuous plastic forming. Based on the basic theory of elastic-plastic finite element method (FEM),the author uses ABAQUS to carry out numerical simulation of cold rotary forging and discuss how to build finite element geometric model and grid it in detail, and analyse the definition of workpiece material model in ABAQUS and the merger technology of Abaqus / Explicit and Abaqus / Standard. In order to measure springback error accurately, the alveolar surface shap after springback was got through the technology of surface reconstruction, it was put into Geomagic Qualify software and compare with target CAD model,then the springback error can befully assessed through comparing results.The examles proof that ABAQUS can simulate the deformation and springback process accurately, springback error of cold rotary forging can not be ignored,so springback error must be compensated.

Abstract: The purpose of this paper is achieve machining the equal base circle bevel gear with a disc cutter. Based on the equal base circle bevel gear theory, By solving coordinate values of the disk cutter section, made tool model in VERICUT environment. By planning disc cutter machining path , the disc cutter trajectory is obtained, simulated the NC machining to a equal base circle bevel gear using VERICUT software. The results show that machining this gear in NC machine can be realized using disk cutter.

Abstract: Machining parameters optimization in face-milling the hypoid gear was often needed in order to obtain lowest cost or highest productivity. In this study, the optimum value of machining parameters including feed rate, rotation speed are obtained using improved harmony search algorithm(IHSA), to yield minimum total time while considering constrains such as allowable cutting speed, tool life and machine tool capabilities. Results indicate that the IHSA converged to optimum solution with similar accuracy in comparison with the genetic algorithm (GA).

Abstract: Prediction of the forces in milling hypoid gear was often needed in order to establish automation and optimization of the tooth-milling processes. Based on the geometrical theory of the format face-milling, the multi-toothed milling forces theoretical model for form milling the gear of the hypoid gears is presented, the milling force factors were calibrated via single factor experiments and the simulation programs were prepared. Experiments were carried out to verify the availability of the multi-toothed dynamic milling force model, the experimental results is consistent with the simulation results.

Abstract: Based on non-smooth impact theory, the dynamic model of spiral bevel gear is constructed by considering of input shaft angle excitation. The Maximal Lyapunov Exponents (MLEs) curves for backlash 0.10mm and 0.14mm caused by exciting amplitude are given. The simulation results indicate that gear backlash, excited amplitude and retard torque have influence on the dynamics behavior of spiral bevel gear system. The experiments show that the vibration noise is deduced after ultrasonic gear lapping.

Abstract: Planetary gear trains have many advantages in applications. In these advantages, quiet noise and slight vibration may be contribute to low Transmission Error (TE), which can be calculated by Tooth Contact Analysis (TCA). However, to obtain numerical solution of the meshing equations based on TCA for planetary gear trains is very difficult because of a large number of nonlinear equations and unknowns. A simplified method utilizing planet phase angle is investigated and the numerical solution of planetary gear trains TE by TCA can be realized in this paper.

Abstract: Based on the in-depth study the principle of NC generating gear tooth surfaces by application of the disc milling-cutter, finger milling-cutter NC generating spiral bevel gear tooth surfaces is presented in this paper. Through using a 5 shaft 4 linkage machining center, the finger milling-cutter is mounted on the imagination disc milling-cutter, in fact, 2 NC axes are used simultaneously to control the finger milling-cutter motion, imitating a blade motion of disc milling-cutter, and the motion of the blank is not change, to generate the spiral bevel gear tooth surfaces. A spiral bevel pinion is simulation machined by using machining simulation system VERICUT and the feasibility of the machining method is verified.

Abstract: The system of automatic correction and deviation measurement of hypoid gears is the basic platform for the digital closed-loop manufacturing technology. Based on the gear measuring center and the numerical controlled gear milling machine, a measurement and correction system is developed by the application of Visual C++ and Fortran. The architecture and the implement of the main modules are elaborated. Experiments and applications indicate that the tooth surface deviation can be effectively reduced by the system of automatic correction and measurement, and the stability of tooth surface precision and manufacturing quality is improved. It would provide the foundation for the digitalization of manufacture and quality control of hypoid gears.

Abstract: The cone angle effect of CBCT system and affecting reconstructing slice are discussed. The CC-FDK algorithm is introduced. The redundancy data is not disposed accurately in FDK algorithm. The thesis puts forward a weighting projection method based on cone angle and distance to center plane. The method compensates the information of projection unused in FDK algorithm. The simulation model is scanned and reconstructed. The result indicates that this method can extend the cone angle of scanning.

Abstract: The tooth face width characteristics of offset face-gear drive are considered in this paper. Base on the generation process of offset face-gear, the analytical geometry of the offset face-gear drive is derived. The conditions of undercutting and pointing for offset face-gear are studied, the expressions of inner radius and outer radius able to avoid undercutting or pointing are presented. The effects of the tooth number of the shaper, gear ratios and offset distance on undercutting, pointing and tooth face width of offset face-gear are analyzed, respectively. The expressions of approximate solution for inner radius and outer radius are provided.