Materials Science Forum Vols. 704-705

Abstract: Based on actual production, the each mould in the production line of containment of nuclear power reactor and the frame of THP22-4000 hydraulic press was modeled by coupling method. By using the finite element analysis simulation software ANSYS Workbench, the stiffness and strength of each coupling models were analyzed by node-coupling method. According to the results having been analyzed formerly, the distribution of stress and strain of each coupling models were studied, and the influence rules of assembly area of mould on workbench and close-height of mould on coupling stiffness were drawn, so as to guide the mold and the hydraulic structure design and optimization. Under the prerequisite of ensuring the forming precision of containment, it would be possible to configure and optimize scientifically and rationally the structure of forming molds and equipments, lower the costs of productions, and obtain higher economic benefits.

Abstract: In this paper, the nosing process of metal tube with a conical die is investigated using the finite element method, and a series of simulations on the tube nosing process by using the program ABAQUS is carried out. The concrete process of tube nosing deformation is described. Some simulation results on tube nosing deformation such as the distributions of the Von Mises stress and effective strain, the material thickness variation of deformation zone are obtained and analyzed.

Abstract: Bending process is one of the important methods to form thick hull plate, whose accuracy is directly related to the quality of hull plate forming.In this paper, bending process of thick hull plate is simulated by using finite element software ANSYS, and some simulation results on bending deformation of thick hull plate such as the deformation of meshes in deformation zone, the distributions of the Von Mises stress and effective strain are obtained.

Abstract: In this paper, the spinning process of automotive wheel rim is simulated with the finite element software DEFORM-3D. The forming of the automotive wheel rim based on finite element method is completed by the improvement of the spinning process. it can be divided into three different stages: spinning stage, flattening stage and shaping stage. The reference data for technological parameter of spinning process is achieved.The results are useful to the further research of the spinning process of automotive wheel rim.

Abstract: Dual phase (DP) steel is a high strength steel for auto-panel. In this paper, mechanical property, forming ability, baked-hardening and work hardening properties of high strength steel DP450 are studied by experiments, and compared with those of steel MS6000.And theoretical research on predicting the forming limit of steel DP450 by the NADDRG model. The established mathematic model for relativity is of practical usefulness. Experimental results reveal that the yield strength of steel DP450 is about 7.2% lower than the MS6000,and the break strength increases by 18.9%,while the elongation increases by 19%.The strain hardening exponent of steel DP450 are superior to those of MS6000.The results show that mechanical property of high strength steel DP450 is better than that of MS6000,while forming ability of DP450 is not lower than that of MS6000.And baked-hardening and work hardening properties of steel DP450 are better than those of MS6000.The steel sheet DP450 owned a good forming ability.

Abstract: 6xxx based alloy auto body sheet will be used widely in the future, but, in the recent, one of the difficulty in practice is its poor formability. In this paper properties parameters of 6061 aluminum alloy sheet are investigated by means of examination; By using machine performance parameters of 6061 aluminum alloy, finite element software eta/DYNAFORM of Sheet Forming make the numerical simulation of auto deck lid outer panel .Stress, plastic strain, thick variety are analyzed; and the wrinkling and cracking prone areas identified. Therefore, the effective reference can be provided for design of forming process of 6xxx Based Alloy auto panel.

Abstract: Air-entrapped is a common defect for high pressure die-casting, so it is critical to discharge the air out of mold cavity as much as possible. This study takes the research on air quantitative prediction technology based mold-filling process. Firstly, the quantitative prediction technology is introduced and the mathematical model based on a simple die casting is established. Secondly, based on HZCAE technology the paper offers calculation module and post-processing module about air quantitative prediction. And then, water simulation is carried out to validate this air-entrapped prediction technology. Finally, combined with a die-casting case, we use the program to calculate its air quantitative prediction based on the simulation result of HZCAE/InteCAST. Keywords: Air quantitative prediction, HZCAE, High pressure die-casting, Numerical simulation, Mold-filling process

Abstract: The development of new products of seamless tubes require the development of corresponding grooves in order to manufacture tubes with high precision, high efficiency at low cost. In this work, a finite element model and dynamic simulation of continuous rolling pass for seamless tubes process has been implemented under the ANSYS/LS-DYNA environment to verify the validity of the pass design. The result show the deformation characteristic of cross-section, the variation regularity of rolling force, strain and stress conform to the reality. The work is effective for developing new grooves and products for seamless tube continuous rolling.

Abstract: Eccentric extrusion method is used in this paper，through this method achieved bending aluminum-alloy tube extrusion forming process. Used finite element method，achieved three-dimensional numerical simulation of bending aluminum-alloy tube in eccentric extrusion by DEFORM-3D finite element commercial software，analyzed velocity field distribution，material flow，squeezing pressure，stress and strain field distribution of the process；Introduce the mechanism of one step direct extrusion forming tube bending process，it will be of great guiding significance the actual die design.

Abstract: Under laboratory conditions, simulated Bell-type annealing technology , researched the annealing temperature on the SPCC cold-rolled steel sheet mechanical properties. The results indicate that when the time of annealing is shorter (1h), the hardness of steel that used to test decreased with the annealing temperature increased; when the time of annealing is longer (5h), the microhardness is increase slightly with the annealing temperature increased, while the lower plastic decreased.