Advanced Materials Research Vols. 538-541

Abstract: The variable-speed reducer is the key transmission part in the transmission mechanism of oil press, and with the analysis of the transmission plan, the variable-speed reducer of the transmission mechanism is designed according to the performance requirements of the oil press. The simulation analysis is processed by Solidworks, and the simulation results are consistent with theoretical design which meets the requirements of the manufacturing. In practical production and processing, it has very good reference and directive significance.

Abstract: Adopting the finite element software ANSYS, this paper calculates the temperature and stress fields of the combined piston under the conditions of cooling and no cooling. The analytical results show that the piston under no cooling condition has higher thermal load and integrative stress than the condition of cooling, because the piston head can’t get better cooling. Moreover, the high thermal load causes the piston head creating great deformation, which has exceeded the normal gap between the piston and the liner, so the piston abrasion may worsen.

Abstract: A slope is studied with limiting equilibrium method and finite element method comparatively. It is found that the results of the two methods are almost the same. The distribution of principal stress, maximal plastic strain, plastic zone, lateral displacement, vertical settlement and incremental of displacement can be investigated by FEM effectively, which make it easy to expediently choose the method of slope reinforcement and the position of strengthening.

Abstract: Finite element analysis models of both ultrasonic vibration assisted and conventional milling of Ti-6Al-4V were developed. In ultrasonic vibration assisted milling model, high frequency vibration (frequency, f=20kHz; amplitude, a=50 um) is superimposed on the movement of the cutting tool. Comparative analyses of temperature distribution, cutting forces, cutting stress were carried out for both ultrasonic vibration assisted and conventional milling processes. Overall reduction in milling forces and temperatures for ultrasonic vibration assisted milling in comparison to conventional milling is obtained.

Abstract: The finite element method was carried out three-Dimensions analysis of the solid shelves, gained the deformation characteristics and stress distributions of the solid shelves. Finite element analysis software ANSYS was used to analyze the solid shelves from the static. We have the results after correct loading and constraint and stress values comparison. A simulation example for three-dimensional shelves is presented to illustrate the effectiveness of the finite element analysis method.

Abstract: Abstract: In this paper, the traditional trunk lid was analyzed using finite element method firstly, and then the basic mechanical properties of the lid were obtained, which were used as the topology optimization constrains of the trunk lid outer panel, then the aluminum alloy frame structure that could satisfy the static mechanical stiffness properties was designed; According to the requirement, the trunk lid inner panel was redesigned, the material properties determined in advance were given to the inner and outer panel respectively, after being assembled, the best panel thickness could be obtained by ways of size optimization. Compared to the analysis results, the new aluminum-plastic structure can meet the requirements in performance, and has significant effect on light-weight. This paper provides some reference for the development of the aluminum-plastic structure of the body design method.

Abstract: According to the recent rise in oil prices, interest in FCC Unit (Fluid Catalytic Cracking Unit) energy recycling is increasing. FCC Unit is a facility which refineries low-valued bunker C oil into high-valued gasoline. Pressure vessel that refines crude in FCC Unit needs vary interpretation because it operates in high-temp and press. Even our concern about this FCC Unit is increasing, our experiments about its safety is not enough. In this paper, whether FCC Unit has structural stability or not, we found out FEA(Finite Element) after trying 3D modeling by using FCC Unit’s condition of design and critical stress as a translating data. We conducted our structure prediction of fragile sites. And stress analysis was performed. Finally, we strengthened on the weak point and tried reinterpretation to bring both of simple measurement and increase of structural stability. Data of pressure vessel follows ASME, and we made an assessment through this standard.

Abstract: Flexible forming using plasma arc (FFUPA) is a newly developed process of sheet metal forming, which can deform the sheet metal without mould and die, and thus is a promising method for rapid prototyping and short-run production. To achieve a large bending angle, it is unavoidable to scan the sheet metal for multiple times. However, the average bending angle reported in literature for each time is limited. To obtain a larger bending angle by each scan, this paper proposes a new scanning process, in which an assistant heat source is placed ahead of the plasma arc. The proposed scanning process has been studied by numerical simulation and optimized for the optimal processing parameters.

Abstract: Firstly, methodology of valve spring’s static strength and fatigue strength reliability analysis is built up, and detailed computational formulas to derive distributions of the stress and strength are described. Secondly, to make full use of the material characteristic and consider reliability of the mechanism part, taking the spring’s mass as the objective function and based on spring’s traditional and reliability constraints, mathematic model of reliability optimization design of valve spring is established using mechanical reliability design method and mechanical optimization design method. At last, the proposed method is applied to a practical spring design example by integrating optimization tools with the optimization model. The comparison of reliability optimization design results and traditional optimization design results shows that the reliability optimization method is practical and reliable; its design results can satisfy all design requirements with smaller mass.

Abstract: Electromagnetic stirring is an effective technique of improving the solidification structure and mechanical properties during continuous casting，because there is a notably effect of the flow on the density,segregation and inclusion of molten metal. In order to better understand the molten metal flow, the analysis software-ANSYS is used to simulate the 3D couple field of electromagnetic field and flow field for the self-developed rotating electromagnetic stirring equipment. The pure aluminum,tin and lead are used for both of experiment and simulation. The following results are obtained: 1) The magnetic induction intensity of liquid metal surface (B0) is in inversely proportional to the current frequency and is proportional to the input volt/current. 2) The maximum electromagnetic force is directly proportional to the square of magnetic induction intensity (B0) and the nth-power of current frequency decreases with the increase of the electric resistance of molten metal and changes from 1/2 to 3/2. The n is 1/2 for aluminum metal and 1 for tin metal and lead metal. 3) The rotating velocity of molten metal is directly proportional to the magnetic induction intensity(B0) and is in inversely proportional to the square root of the density of molten metal. The viscosity of molten metal has little effect on the rotating velocity. The above results are consistent with experiment results, which prove the credibility of simulate results.