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| 1 | RESEARCH ON THE EVALUATION METHOD OF FRICTION AND LUBRICATION IN DEEP DRAWING显示文摘The deformation characteristic of bland in deep drawing is discussed. It is pointed out that the friction and lubrication conditions in for drawing are different from that in mechanical motion or machine work or other plastic process. The common test methods in laboratories are analyzed. It shows that though all those test methods can test the friction coefficient, the probe test method is most suitable for the research of friction and lubrication and the process in deep drawing, for this method is identical with the actual work condition either from the test principle or deformation status of the blank. Last the successful application in the deep drawing simulator newly developed the the probe method are intro- duced in detail. | D. N. He, X. F. Yin, H. Z. Thao, D. L*, X. Y. Ruan, J. L. Cheng and J. Y. Jiang 1) Shanghai Jiao Tong University, National Die & Mold CAD E. R. C, Shanghai 200030, China 2) Shanghai Vopkswagen Automotive Company Ltd., Shanghai 201805, China Manuscript re | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，2： | 13 |
| 2 | A LOOP DRAWBEAD RESTRAINING FORCE MODEL IN SHEET METAL DEEP DRAWING PROCESS显示文摘In sheet metal forming, drawbeads are often used to control uneven material flow which may cause defects such as wrinkles, fracture, surface distortion and springback. Appropriate setting and adjusting the drawbead force is one of the most important pa- rameters in sheet metal forming process control. This paper derives the model of loop drawbead restraining force (DBRF) using plastic forming theory, and gives the min imum blankholding force. Experiments are carried out to verify the proposed DBRF model. The good agreement between the calculated values and experiments data justi- fies the proposed loop drawbead restraining force model. | Y.J. Luo, S.P. Li, J.F. Zheng, D.N. He, Y.Q. Zhang, J.L. Cheng and J. Y. Jiang 1)National Mold & Die CAD Engineering Research Center, Shanghai 200030, China 2)Shanghai Volkswagen Automotive Company Ltd.(SVM), Shanghai 201805, China | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，5： | 11 |
| 3 | EXPERIMENTS AND SIMULATIONS OF A NEW DEVELOPED FORMING TECHNOLOGY-SHEAR-EXTRUSION PROCESS OF COMPONENTS WITH BRANCHES显示文摘Shear-extrusion process and its forming parumeters are proposed, whilst its laborsav- ing characteristic is utilized to forge large-size shutoff valve body on middle-due press. This new process is intended for the manufacture of large-size forged tubular components with branches on middle-due press. Experiments are carried out and processing parameters are obtained regarding the shear-extrusion process of a large-size shutoff valve body. Daformation and metal flow in the shear-extrusion process are inves- tigated. In orber to verify the laborsaving characteristic of this new process some contrastive experiments of extrusion force are performed between shear-extrusion and upsetting-extrusion for forming tubular components with branches. Based on rigid plastic FEM a plane-stain model is established to analyze shear-extrusion process of tubular components with branches. The analysis results by 2-dimensions PEM are comparatively quite well consistent with those of experiments. Both simulated and experimental results show that this new forming process is feasible for forging large-size tubular components with branches on middle-due press. | H.L. Yang, D.C. Kang, Z.L. Zhang, X.H. Piao and Z.D. Shi (National Die and Mold CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China) (School of Materials Sci. & Eng., Harbin Institute of Technology, Harbin 150001, China) | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，3： | 6 |
| 4 | OPTIMIZATION OF AUTOBODY PANEL STAMPING PROCESS BASED ON DYNAMIC EXPLICIT FINITE ELEMENT METHOD显示文摘Taking CPU time cost and analysis accuracy into account, dynamic explicit finite ele- ment method is adopted to optimize the forming process of autobody panels that often have large sizes and complex geometry. In this paper, for the sake of illustrating in detail how dynamic explicit finite element method is applied to the numerical simulation of the autobody panel forming process,an example of optimization of stamping process pain meters of an inner door panel is presented. Using dynamic explicit finite element code Ls-DYNA3D, the inner door panel has been optimized by adapting pa- rameters such as the initial blank geometry and position, blank-holder forces and the location of drawbeads, and satisfied results are obtained. | X. G. Bao D. N. He D. Lu C. X. Li J. L. Cheng and J. Y. Jiang( 1) National Mold and Dies CAD Engineering Research Center, Shanghai 200030, China 2) Shanghai Volkswagen Automotive Company Ltd.(SVW), Shanghai 201805, China) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 6 |
| 5 | Investigating on casting mold (or core) making with coated sand by the selected laser sintering显示文摘1 .Introduction Based on the parameters and cross-section’s information from a CAD model, the selected laser sintering (SLS) uses a laser beam to sinter selectively powdered solid materials (plastic, wax, ceramic, metal, etc.), and the solidified material is built up layer by layer to formthepart needed} As there are still some problems in material and technology, it is difficulty to sinter or produce | ~*Zitian FAN, Naiyu HUANG, Yan LI, Zhili LIU(State Key Laboratory of Plastic Simulation and Die & Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China) | 2004 | China Foundry2004，1，2： | 6 |
| 6 | STRESS ANALYSIS OF INJECTION MOLDED PARTS IN POST-FILLING STAGE显示文摘The linear isothermo-viscoelastic constitutive equation is established according to the principle of viscoelastic mechanics. Given the boundary conditions of the temperature field, the linear thermo-viscoelastic constitutive equation is established acording to the analysis of the thermorheologically simple. The stress analysis model is constructed on the base of some reasonable hypotheses which consider the restraint conditions of mold and the characteristics of injection molding in the post-filling stage. The mathematical model is calculated by the finite difference method. The results can help to predict the warpage of plastic products. | Jiang Tao Chen Xing Li Dequn (National Key ho of Plastic Simulation & Molding Technology Huazhong University of Science & Technology) | 2000 | Chinese Journal of Mechanical Engineering2000，13，1： | 5 |
| 7 | Modeling and simulation of residual stresses during glass bulb pressing process显示文摘The residual stresses accumulated in the forming process have great effects on the product quality of the glass bulb. Based on the characteristics analysis of glass bulb forming, a mathematical model has been established for calculating residual stresses of glass pressing process. The material is assumed as thermorheologi-cally simple thermoviscoelastic material, and the flow-induced stress is neglected. The consequences of equilibrium and compatibility equations are discussed in detail, and the boundary conditions are specified for various stages of the forming process. The numerical solution is based on the theory of thin layers, combined with finite difference method in the time and layer difference in the thickness di-rection. The presented model and solution method could easily be extended to general pressing process of glass, and applied to problems relative to glass pressing, providing extensive reference values. | ZHOU HuaMin, XI GuoDong & LI DeQun State Key Laboratory of Plastic Forming Simulation and Mold & Die Technology, Huazhong University of Science and Technology, Wuhan 430074 | 2007 | Science China(Technological Sciences)2007，50，1： | 4 |
| 8 | PREDICTION OF ACOUSTIC PERFORMANCE IN EXPANSION CHAMBER MUFFLERS WITH MEAN FLOW BY FINITE ELEMENT METHOD显示文摘The equation of wave propagation in a circular chamber with mean flow is obtained. Computational solution based on finite element method is employed to determine the transmission loss of expansive chamber. The effect of the mean flow and geometry (length of expansion chamber and expansion ratio)on acoustic attenuation performance is discussed, the predicted values of transmission loss of expansion chamber without and with mean flow are compared with those reported in the literature and they agree well. The accuracy of the prediction of transmission loss implies that finite element approximations are applicable to a lot of practical applications. | Liu YadongLi CongxinRuan XueyuNational Die & Mold CAD EngineeringResearch Center,Shanghai Jiaotong University,Shanghai 200030, China | 2003 | Chinese Journal of Mechanical Engineering2003，16，3： | 4 |
| 9 | Study on Semi-solid Rheocasting Forming for Magnesium Alloy by Mechanical Stirring显示文摘In this paper the effect of pouring temperature of magnesium melt, preheating temperature of the barrel of screw mixer and shear rate on the solidified microstructures of semi-solid slurry was investigated by mechanical stirring method. The appropriate processing parameters of slurry preparation were obtained. The mold filling for thin walled casting was examined. Results indicated that the solid volume fraction of non-dendritic structure increased with decrease in pouring temperature of magnesium melt and the barrel preheating temperature of screw mixer. Also the grain size of primary α phase was reduced. Furthermore, the solid volume fraction of semi-solid non-dendritic structure decreased with the increase in shear rate. In the same time, grain size of primary α phase slightly changed. The fine-round granular solidified structure with 30~50 μm of prepared AZ91D magnesium semi-solid slurry was presented. Finally, it is successful to fabricate 1.0 mm extremely thin walled casting with clear contour and good soundness. | LI Dong-nan, LUO Ji-rong, WU Shu-sen, XIAO Ze-hui, MAO You-wu, SONG Xiang-jun, WU Guang-zhong (State Key Lab of Mold & Die Technology, Huazhong University of Science and Technology, Wuhan 430074, China) | 2002 | 厦门大学学报(自然科学版)2002，41，S1： | 3 |
| 10 | Finite element simulation of stretch forging using a mesh condensation method显示文摘In order to reduce the computation time of finite element simulations of stretch forging process,a mesh condensation method is presented and applied to a three-dimensional rigid-viscoplastic finite element program.In this method,a conventional mesh for the whole zone of a workpiece is condensed to a computational mesh for the active deformation zone.Two vital problems are solved,which are automatic construction of the computational mesh and treatment of interfaces between the deformation zone and the rigid zone.The mesh condensation method is compared with conventional finite element method by simulations of a six-bite stretch forging process.Some simulation results including forging load,temperature distribution and effective strain distribution are illustrated.The efficiency and accuracy of this method are verified. | CHEN Wen & CUI ZhenShan National Die & Mold CAD Engineering Research Center,Shanghai Jiao Tong University,Shanghai 200030,China | 2010 | Science China(Technological Sciences)2010，53，1： | 3 |
| 11 | FINITE ELEMENT SIMULATION AND OPTIMIZATION OF MULTISTAGE WARM/HOT FORMING FOR OUTER RACE显示文摘A multistage warm/hot forming is simulated for the cross grove outer race of constant velocity joint, using athermo-mechanical coupled rigid viscoplastic finite element method, and specially some problem for process develop-ment and die design are analyzed. A forming test shows that computed results have good agreement with experimentalresults. Above obtained results can be applied to development of multistage warm/hot forming process and die designfor outer race. | Wang Huajun Xia Juchen Hu GuoanState Key Laboratory of Plastic Forming Simulation and Die & Mold Tech., Huazhong University of Science and Technology, Wuhan 430074, China | 2002 | Chinese Journal of Mechanical Engineering2002，15，4： | 2 |
| 12 | Serum amyloid P component and C-reactive protein mediate phagocytosis through murine FcγRs显示文摘 | Mold C Gresham H D Du Clos T W | 2001 | J Immunol2001，166，： | 2 |
| 13 | Complementary recognition of actemative pathway activator by decay - accelerating factor and factor H 显示文摘 | Kraus D Medof ME Mold C | 1998 | Infect Immun1998，66，2： | 1 |
| 14 | Role of laccase and low molecular weight metab olites from Tramctes versicolor in dye decolorizat ion显示文摘 | Diego Moldes Mar'ia Fern'andez-Fern'andez M 'Angeles San- rom'an | 2012 | The Scientif- ic World Journal2012，，2012： | 1 |
| 15 | Attitudes of Asian medical students towards smoking显示文摘 | Hussain SF Mold I Khan JA | 1995 | Thorax1995，50，9： | 1 |
| 16 | Inmunohisto chemistry and surgical approaches in solitary fibrous tumor of the pleura显示文摘 | Martinea P Moldes Rodriguea M Moreno Masta N | 2007 | Cir Esp2007，81，3： | 1 |
| 17 | Serum amyloid P component and C-reactive protein opsonize apoptotic cells for phagocytosis through Fcgamma receptors显示文摘 | Mold C Baca R Duclos TW | 2002 | J Autoimmun2002，19，3： | 1 |
| 18 | Degradation or polymerisation of phenol red dye depending to the catalyst system used显示文摘 | Moldes D Lorenzo M Sanroman M A | 2004 | Process Biochemistry2004，39，： | 1 |
| 19 | Evaluation of biosurfactant production from various agricultural residues by Lactobacillus pentosus显示文摘 | Moldes AB Torrado AM Barral MT | 2007 | J Agric Food Chem2007，55，11： | 1 |
| 20 | Optimization of D-lactic acidproduction by Lactobacillus coryniformis using response surfacemethodology 显示文摘 | BUSTOS G MOLDES A B | 2004 | Food Microbiol2004，，21： | 1 |
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