Applied Mechanics and Materials Vols. 401-403

Abstract: The development of worm gear wheel blanks cold extrusion forming technology which can both reduce the manufacturing costs of the worm gear and enhance the Market competitiveness of products .Numerical simulation of cold extrusion forming technology of wheel blank was built by using Qform3D forging simulation software. That is, after the quantitative analysis of the distribution of stress fields and strain fields in the forming technology, determining the technology plan and conducting technology test, then the reasonable and feasible technology is designed. Cold extrusion can avoid the presence of the air gap, shrinkage and other tissue defects in the casting process, meanwhile raw materials can be saved 47% approximately than cutting.

Abstract: A car battery bracket was taken as the research object and the warp deformation of plastic products was as the quality evaluation index, through the range analysis of orthogonal test method, the influence degree of the warp deformation from the melt temperature, mold temperature, injection time, packing pressure and dwell time was determined, the preliminary optimization of process parameters combination was obtained. Further uniform design was applied for local optimization by taking the preliminary optimized parameters as the basis, the optimal process parameters combination was obtained and further verified by simulation.

Abstract: In this article, the influence of different process parameters on the bottom thickness of CNG container during the deep drawing and ironing process has been analyzed by simulation. The bottom die fillet R, the spacer height H between blank holder and bottom die and the friction coefficient μ between punch and billet were selected as parameters for optimization. The simulation results reveals that the appropriate bottom die fillet R and spacer height H is needed to reduce the thinning of product bottom. Meanwhile, the bigger the friction coefficient μ, the thicker the product bottom. The optimized results were utilized in the experimental production and the products in the three passes meet the designed requirements, which illustrates that the simulation results have great help for the actual production.

Abstract: Large hydrogenated forging cylindrical shell material whose composition is 2.25Cr-1Mo-0.25V is the main machining material of large nuclear power and petrochemical industry, and doing research on its machining ability is of great significance. In this article contrast test of machining ability of three materials: 2.25Cr-1Mo-0.25V steel, 45steel and 42CrMo steel was carried out from three aspects: force of cutting, temperature of cutting and breaking of chips. Then machining ability of three materials was contrasted and analyzed through force of cutting data, temperature of cutting data and object of chips which had been got from test. The reason why cylindrical shell material is difficult to machine was analyzed and some associated measures to improve machining ability of cylindrical shell material were put forward.

Abstract: The physical model of natural gas catalytic combustion furnaces was established, furnace was simulated using ANSYS software, and verifying the validity of the simulation through the experimental test data. Simulation results and test results were analyzed, concluding that law of internal temperature field in furnace, to provide a reference for the next application of furnace

Abstract: Spline finite strip method is the basic theory to analyze the cold-bending formation. Based on principle of virtual work by spline finite strip method, energy model of strip element was established. The qualitative forming factors which are difficult to quantify, and the constraint conditions to form model were given into information description. Combing with specialist experience, solving task system of multi-Agent was established. By amending the Agent of knowledge containers and social relationships, every random factor influencing on forming quality effected objectively in the multi-Agent systems based on the changing environment. Then, the formation of dynamic task is solved. This work can provide theoretical guidance for complex design of steel in roll pass.

Abstract: In previous studies guide-based blending including inner and outer blending has been found to be an efficient way to deal with large composite optimization problem considering structural integrity. A new blending model named generalized blending based on genetic algorithm for composite optimization is presented. First, On the basis of region division, a length-control indicator is introduced to decide the covered regions of each ply for the generalized blending model. Also, the master-slave parallel genetic algorithm (GA) is adopted to decrease optimization time. Finally, the three blending models are used for a large composite wing optimization. The result shows that the three optimal designs are manufacturable and the generalized blending model has more design freedom in blending designs.

Abstract: In waxy crude oil transportation process, wax crystals start to precipitate as the oil temperature drops to wax appearance point, and then form a network structure gradually which attaches to the wall. The problem of wax deposition seriously affects the normal operation of pipeline. Based on the wax deposition tendency coefficient method, combined with experimental data, the parameters related to wax deposition tendency coefficient is fitted, and the wax deposition rate equation of crude oil is determined finally. The variation law of wax deposition rate along the pipeline is analyzed, and the influence of different seasons and different throughput the on wax deposition rate is discussed subsequently.

Abstract: This paper studies the dynamic modeling of weld seam by using the laser vision sensor in virtual environment (VE). By introducing virtual guide (VG), lowering operative difficulty and showing high security can be obtained. Template matching is used to recognize remote weld seam, and the uniform contour of V is defined to represent the features of remote seam. Cubic spline interpolation is employed to construct the continuous model of the seam.

Abstract: This paper introduces the current situation of the ethylene oxide/ethylene glycol plants decarbonization system of Sinopec Maoming company. The solid polymer produced in condensate liquid of reecycle gas is characterized. The formative factors of polymer are analysed.Some referential basises are provided for plants long-periodic safety production.