Advanced Materials Research Vols. 341-342

Abstract: According to the actual work conditions, 3D FE model of channel bending forming is established on the platform of eat/DYNAFORM. Belytschko-Tsay (element # 2) in the cell library unit of eta/DYNAFORM is selected, and the geometric model is reasonably meshed by using topological mesh technology. In order to improve the accuracy, adaptive function is adopted. We established the proper material constitutive model for Ti-6Al-4V; gave a reasonable load curve by reasonable calculating and adjusting the loading time step in solving process; chose reasonable lubricant, provided practical coefficient of friction between the mould and blank in the simulation process by using the contact theory and classic coulomb friction law. Finally, we established the finite element model of the channel bending forming of Ti-6Al-4V actually, provided supplementary support for actual production.

Abstract: High deformation hardening, low thermal conductivity, high built-up edge tendency of austenitic stainless steels were the main factors that make their machinablity difficult. For determination of the suitable cutting parameters in machining austenitic stainless steel AISI 304 by PcBN cutting tools, the samples which were prepared to be used in the experiment, 300 mm in length and 60 mm in diameter, were dry machined in a numerical control lathe. During experiments, dry turning parameters, such as feed rate, cutting speed and cut depth were investigated. The suitable cutting speed and feed rate were determined according to workpieces surface roughness, cutting tools flank wear. Finally, cutting speed of 180 to 200 m/min, feed rate of 0.05 to 0.06 mm/rev and cut depth of 0.10 mm gave the satisfied results.

Abstract: This paper, according to the movement principle of clothing dynamic mannequin, discusses the research and development of the clothing dynamic mannequin. This paper, particularly, does the research on spherical joints technology application in clothing mannequin, in order to give clothing industry relevant dynamic mannequin technology as reference.

Abstract: In this study, the precision forging process of spur gears has been investigated by means of numerical analysis. The effect of some parameters such as teeth number and module on the forming force and specific pressure were presented. The simulation works were performed rigid-plastic finite element method using DEFORM 3D software. In order to validate the estimated numerical results, they were compared with those obtained experimentally during precision forging of spur gear using lead as a model material. Results showed that the optimum number of gear teeth is between 10 to 20, that is because of being the specific pressure in its minimum value. Also the results obtained from analyzing the effective strain distribution showed that the maximum strain is located on the root area of the teeth. The work presented in this paper might be used for basic data in the design of the precision forging process.

Abstract: The experimental study results show that the system’s nonlinear characteristics, incluing the dynamic responses of the poincare mapping, the bifurcation plots, three-dimensional waterfalls diagrams etc. The effects factors of system experiment are studied and analyzed, including the misalignment and the rub-impact stiffness on system responses. So, the faults characteristics of the misalignment and the rub-impact of the rotation shaft-mechanical seal system on the drainge motor and drainge pump are also gained by the experiment. The dynamic performance of the system show nonlinear characteristics in different working conditions. The rotating shaft-mechanical seal system on the drainge motor and drainge pump can be optimization design and performance prediction based on the studied results of our work. The experiment’s results show that: the multiple frequencies are produced of the rotating shaft-mechanical seal system on drainge motor and drainge pump, and the frequencies of 1-time and 2-time are dominating components under the exciting force effects of misalignment and imbalance. At the fault state of misalignment coupling rub-impact, the multiple frequencies including 2-time, 3-time, 4-time and so on, will be induced under the critical speed. Over the value of the critical speed, will cause the phenomenon of frequency demultiplication and chaos. With rub-impact stiffness value increased, the phenomenon of frequency demultiplication and chaos are induced more frequently; with the degree of misalignment increased, the phenomena of chaos will decrease and the system will tend to be the stable state.

Abstract: Carbon fiber composite tubes with symmetric winding angles were experimented under tensional loading and theoretically calculated using classical laminate theory. The experimental result showed that the axial stiffness of filament wound tubes without woven fiber was a little higher than that of filament wound tubes with woven fibers. In addition, the theoretical calculation results of axial stiffness had a good agreement with the experimental results of filament wound tubes without woven fiber.

Abstract: The filament winding pattern of composite tube, the winding parameters and the undulation degree are studied in this paper. The study shows that the winding pattern mainly depends on S_p , the number of angular sections between the last circuit and the next circuit and N_c, the number of circuits performed until the fiber tow is deposited just next to the first circuit, and the changes of N_c and winding angle all have effects on the undulation degree.

Abstract: Machinery industry changes with each passing day, asking for the more and more importance of the machinery industry performance. The innovative design needs to be used to tools designing for improving the work more efficiency. Take the wrench product designing as an example, this article analyzes the issue of the mechanical products innovation, applies the theories of innovation to a manual wrench innovative design and puts forward the thought of the wrench innovative design scheme, principles and the design process. In the end, the design scheme is evaluated, which indicates that the innovative design approach can be applied to a manual wrench design.

Abstract: Improving thermal characteristics is a crucial approach for increasing machining accuracy of NC lathe. Modeling and analysis of thermal characteristics to a high speed NC lathe were implemented by using finite element method in this paper. Based on this, temperature rise characteristic of the whole spindle system was obtained. The thermal deformation of spindle system due to thermal-mechanical coupling was calculated. Layout and parameter were optimized for the radiating plate of spindle box. And this leads to a considerable reduction in the run-out error of spindle head. The optimization result reaches the expected goal.

Abstract: The method of piston pin's strength calculation base on FEA is proposed to solve the pin's failure. The pin's circular deformation is measured by node displacements, and the conventional static strength analysis is replaced by multi-case fatigue calculation. Compared with the conventional strength verification method, the FEA result is more accurate with the reality.