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Influence of PVD-duplex-treated, Bionic Surface Structures on the Wetting Behavior for Sheet-Bulk Metal Forming Tools 被引量:1
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作者 Wolfgang Tiilmann Dominic Stangier Nelson Filipe Lopes Dias 《Journal of Bionic Engineering》 SCIE EI CSCD 2017年第3期520-531,共12页
Bionic surface structures, inspired by the flora, were developed for Sheet-Bulk Metal Forming (SBMF) in order to locally control the friction condition by adjusting the wetting behavior. Five bionic structures were ... Bionic surface structures, inspired by the flora, were developed for Sheet-Bulk Metal Forming (SBMF) in order to locally control the friction condition by adjusting the wetting behavior. Five bionic structures were micromilled on ASP 2023 in annealed as well as hardened and tempered conditions. Subsequently, the structured surfaces were plasma-nitrided and coated with a CrA1N thin film. The influence of the treatment method on the structural geometry was investigated with the aid of a scanning electron microscope and 3D-profilometer. The wetting behaviors of water and deep drawing oil (Berufluid ST6007) on bionic surfaces were evaluated using contact angle measurements. The resulting micro-milled structures exhibit an almost identical shape as their bionic models. However, the roughness of the structured surfaces is influenced by the microstructure. The combination of plasma-nitriding and Physical Vapor Deposition (PVD) leads to an increase in roughness. All bionic struc- tures possess higher contact angles than that of the unstructured surfaces when wetted by water. This can be explained by the fact that the structural elevations block the spreading. When the bionic surfaces are wetted by deep drawing oil, the lubricant spreads in the structural cavities, leading to smaller contact angles. Furthermore, the anisotropy of the structure has an influence on the wetting behavior. 展开更多
关键词 bionic structures sheet-bulk metal forming CrA1N PVD-duplex treatment wetting behavior
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Reduction of die roll height in duplex gears through a sheet-bulk metal forming method
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作者 Xiao-Long Sun Xin-Cun Zhuang +1 位作者 Feng-Chun Yang Zhen Zhao 《Advances in Manufacturing》 SCIE CAS CSCD 2019年第1期42-51,共10页
In the existing shearing processes for fabricating parts such as duplex gears, die roll is difficult to avoid. Accordingly, a method based on sheet-bulk metal forming for fabricating a duplex gear with extremely small... In the existing shearing processes for fabricating parts such as duplex gears, die roll is difficult to avoid. Accordingly, a method based on sheet-bulk metal forming for fabricating a duplex gear with extremely small die roll in one stroke is proposed in the current work. The process could be divided into three stages according to the forming features: upsetting and shearing stage, lateral extrusion stage, and local filling stage. The die roll appeared in the shearing stage, which could be reduced in the subsequent extrusion and local filling stages. To reveal the underground mechanism, material flows under two situations, as a key factor to influence the forming quality, were compared and investigated. The results revealed that by controlling material flow, one could avoid the defects and reduce the die roll. 展开更多
关键词 DIE ROLL DUPLEX gear part sheet-bulk metal forming Lateral extrusion Material flow
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Flexible-die forming process with solid granule medium on sheet metal 被引量:13
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作者 董国疆 赵长财 曹秒艳 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第9期2666-2677,共12页
Certain non-metallic granules (NMG) were selected as the research object. It was proposed to conduct the volume compression experiments as well as those on the NMG physical properties at high stress levels. Then, no... Certain non-metallic granules (NMG) were selected as the research object. It was proposed to conduct the volume compression experiments as well as those on the NMG physical properties at high stress levels. Then, not only the volume compression ratio curve but also the extended Drucker-Prager linear model were obtained. In addition, through the friction strength tests, parameters of the Mohr-Coulomb model were gained, which proved in basic agreement with those of the extended Drucker-Prager linear model. Additionally, curves of the friction coefficients between the NMG and the sheet metal trader different pressures were also obtained. Based on the material performance experiments, numerical analysis in respect of flexible-die forming process with solid granule medium (SGM) was conducted. The die and device for experiments of solid granule medium forming (SGMF) on sheet metal were designed and manufactured. Typical parabolic parts were successfully trial-produced. The tests and simulation results show that the sheet formability is significantly improved for the extraordinary friction performance during interaction between the SGM and the sheet metal surface. The process control and die structure are simple, and the shaped work-pieces enjoy many advantages, such as satisfactory surface quality and favorable die fitability, which offers a brand-new method and means for processing and preparation of sheet metals. 展开更多
关键词 solid granules medium forming DRAWING sheet metal finite element simulation
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Effect of minor Fe addition on glass forming ability and mechanical properties of Zr_(55)Al_(10)Ni_5Cu_(30) bulk metallic glass 被引量:2
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作者 刘广桥 寇生中 +2 位作者 李春燕 赵燕春 索红莉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期590-595,共6页
A series of rod samples with diameter of 3 mm(Zr0.55Al0.10Ni0.05Cu0.30)100-xFex(x=0,1,2,3,4) were prepared by magnetic suspend melting and copper mold suction casting method.The effects of a small amount of Fe on ... A series of rod samples with diameter of 3 mm(Zr0.55Al0.10Ni0.05Cu0.30)100-xFex(x=0,1,2,3,4) were prepared by magnetic suspend melting and copper mold suction casting method.The effects of a small amount of Fe on glass forming ability(GFA) and mechanical properties of Zr55Al10Ni5Cu30 bulk metallic glass(BMG) were investigated.The results show that the addition of an appropriate amount(less than 3%,mole fraction) of Fe enhances GFA,as indicated by the increase in the reduced glass transition temperature Trg(=Tg/Tl) and the parameter γ(=Tx/(Tg+Tl)) with increasing Fe content,and GFA gets deteriorated by further Fe addition(4%).The addition of Fe also effectively improves the compressive plasticity and increases the compressive fracture strength in these Zr-based BMGs.Compressive tests on BMG sample with 3 mm in diameter and 6 mm in length reveal work-hardening and a certain plastic strain in the alloy containing 2% Fe.The BMG composite containing 4% Fe also exhibits a high fracture strength along with significant plasticity. 展开更多
关键词 bulk metallic glass glass forming ability mechanical properties microstructure
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Sheet Metal Forming Simulation and Its Application in Stamping Process of Automobile Panels 被引量:4
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作者 张扬 张连洪 +1 位作者 李双义 王洪志 《Transactions of Tianjin University》 EI CAS 2002年第4期269-272,共4页
The paper starts with a brief overview to the necessity of sheet metal forming simulation and the complexity of automobile panel forming, then leads to finite element analysis (FEA) which is a powerful simulation too... The paper starts with a brief overview to the necessity of sheet metal forming simulation and the complexity of automobile panel forming, then leads to finite element analysis (FEA) which is a powerful simulation tool for analyzing complex three-dimensional sheet metal forming problems. The theory and features of the dynamic explicit finite element methods are introduced and the available various commercial finite element method codes used for sheet metal forming simulation in the world are discussed,and the civil and international status quo of automobile panel simulation as well. The front door outer panel of one certain new automobile is regarded as one example that the dynamic explicit FEM code Dynaform is used for the simulation of the front door outer panel forming process. Process defects such as ruptures are predicted. The improving methods can be given according to the simulation results. Foreground of sheet metal forming simulation is outlined. 展开更多
关键词 finite element analysis dynamic explicit methods sheet metal forming finite element method codes automobile panel computer simulation APPLICATION
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Multi-Point Forming Technology for Sheet Metal 被引量:10
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作者 LI Ming-zhe, CAI Zhong-yi, SUI Zhen, YAN Qing-guang (Roll Forging Institute, Jilin University of Technology, Changchun 130025, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期17-,共1页
Multi-point forming (MPF) is an advanced manufacturing technology for three-dimensional sheet metal parts. In this paper, the MPF integrated system is described that can form a variety of part shapes without the need ... Multi-point forming (MPF) is an advanced manufacturing technology for three-dimensional sheet metal parts. In this paper, the MPF integrated system is described that can form a variety of part shapes without the need for solid dies, and given only geometry and material information about the desired part. The central component of this system is a pair of matrices of punches, and the desired discrete die surface is constructed by changing the positions of punches though the CAD and control system. The basic MPF process is introduced and the typical application examples show the applicability of the MPF technology. Wrinkle and dimple are the major forming defects in MPF process, numerical simulation is a feasible way to predict forming defects in MPF. In conventional stamping, the mode to form sheet metal with blankholder is an effective way to suppress wrinkling; the same is true in MPF. A MPF press with flexible blankholder was developed, and the forming results indicated the forming stability of this technique. Based on the flexibility of MPF, varying deformation path MPF and sectional MPF were explored that cannot be realized in conventional stamping. By controlling each punch in real-time, a sheet part can be manufactured along a specific forming path. When the path of deformation in MPF is designed properly, forming defects will be avoided completely and lager deformation is achieved. A work piece can be formed section by section though the sectional MPF, and this technique makes it possible to manufacture large size parts in a small MPF press. Some critical experiments were performed that confirmed the validity of two special MPF techniques. 展开更多
关键词 sheet metal multi-point forming flexible forming forming path WRINKLING forming defects
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SIX SIGMA OPTIMIZATION IN SHEET METAL FORMING BASED ON DUAL RESPONSE SURFACE MODEL 被引量:13
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作者 LI Yuqiang CUI Zhenshan ZHANG Dongjuan RUAN Xueyu CHEN Jun 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第2期251-255,共5页
Iterations in optimization and numerical simulation for the sheet metal forming process may lead to extensive computation. In addition, uncertainties in materials or processing parameters may have great influence on t... Iterations in optimization and numerical simulation for the sheet metal forming process may lead to extensive computation. In addition, uncertainties in materials or processing parameters may have great influence on the design quality. A six sigma optimization method is proposed, by combining the dual response surface method (DRSM) and six sigma philosophy, to save computation cost and improve reliability and robustness of parts. Using this method, statistical technology, including the design of experiment and analysis of variance, approximate model and six sigma philosophy are integrated together to achieve improved quality. Two sheet metal forming processes are provided as examples to illustrate the proposed method. 展开更多
关键词 Six sigma optimization Sheet metal forming Dual response surface
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FAST ACCURATE PREDICTION OF BLANK SHAPE IN SHEET METAL FORMING 被引量:14
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作者 LiuYuqi LiZhigang YahYakun 《Acta Mechanica Solida Sinica》 SCIE EI 2004年第1期58-64,共7页
By using the Finite Element Inverse Approach based on the Hill quadratic anisotrop-ically yield criterion and the quadrilateral element, a fast analyzing software-FASTAMP for the sheet metal forming is developed. The ... By using the Finite Element Inverse Approach based on the Hill quadratic anisotrop-ically yield criterion and the quadrilateral element, a fast analyzing software-FASTAMP for the sheet metal forming is developed. The blank shapes of three typical stampings are simulated and compared with numerical results given by the AUTOFORM software and experimental results, respectively. The comparison shows that the FASTAMP can predict blank shape and strain distribution of the stamping more precisely and quickly than those given by the traditional methods and the AUTOFORM. 展开更多
关键词 sheet metal forming Finite Element Inverse Approach blank shape FASTAMP software
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Sheet Metal Forming Optimization by Using Surrogate Modeling Techniques 被引量:6
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作者 WANG Hu YE Fan +1 位作者 CHEN Lei LI Enying 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2017年第1期22-36,共15页
Surrogate assisted optimization has been widely applied in sheet metal forming design due to its efficiency. Therefore, to improve the efficiency of design and reduce the product development cycle, it is important for... Surrogate assisted optimization has been widely applied in sheet metal forming design due to its efficiency. Therefore, to improve the efficiency of design and reduce the product development cycle, it is important for scholars and engineers to have some insight into the performance of each surrogate assisted optimization method and make them more flexible practically. For this purpose, the state-of-the-art surrogate assisted optimizations are investigated. Furthermore, in view of the bottleneck and development of the surrogate assisted optimization and sheet metal forming design, some important issues on the surrogate assisted optimization in support of the sheet metal forming design are analyzed and discussed, involving the description of the sheet metal forming design, off-line and online sampling strategies, space mapping algorithm, high dimensional problems, robust design, some challenges and potential feasible methods. Generally, this paper provides insightful observations into the performance and potential development of these methods in sheet metal forming design. 展开更多
关键词 surrogate OPTIMIZATION sheet metal forming
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Dislocation evolution with rheological forming of metal 被引量:4
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作者 Luo Yingshe(罗迎社) Guo Xiaogang(郭小刚) +1 位作者 Mei Yafu(梅亚夫) Hu Yungui(胡云贵) 《中国有色金属学会会刊:英文版》 CSCD 1999年第3期623-628,共6页
It is known that some internal defects exist in metal materials. Preliminary attempt to relate dislocation evolution with metal rheological forming was done. By the attempt, it is learned that the evolution of disloca... It is known that some internal defects exist in metal materials. Preliminary attempt to relate dislocation evolution with metal rheological forming was done. By the attempt, it is learned that the evolution of dislocation density ρ(x, y, t) is essentially the change of n independent internal variables q α(α=1, 2, …, n) with material. The preliminary research in theory and experiments showed that dislocations piling up could be avoided. One can improve the internal microstructure and mechanical properties of products by rheological forming method. 展开更多
关键词 DISLOCATION metal RHEOLOGICAL forming
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A Study on Super Speed Forming of Metal Sheet by Laser Shock Waves 被引量:4
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作者 ZHOU Jian-zhong 1, YANG Ji-chang 1, ZHANG Yong-kang 1, ZHOU Ming 2 (1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, 21 2013 China 2. School of Material Science and Engineering, Jiangsu University, Zhenjiang 21 2000, China) 《厦门大学学报(自然科学版)》 CAS CSCD 北大核心 2002年第S1期127-128,共2页
Metal sheet plastic deformation or forming is gener at ed through a mechanical pressure or a thermal variation. These pressure variatio ns or thermal variations can be created by a variety of means such as press form ... Metal sheet plastic deformation or forming is gener at ed through a mechanical pressure or a thermal variation. These pressure variatio ns or thermal variations can be created by a variety of means such as press form ing, hydroforming, imploding detonation and so on. According to the magnitude of the strain rates all these forming methods can be divided into quasi-static fo rming and dynamical forming. Up to now there are no reports of forming methods w ith the strain rates above 10 5sec -1, even though the exploding forming. In this article, we work on a dynamic super-speed forming method driven by lase r shock waves and advanced a novel concept of laser shock forming. The initial o bservation of the laser shock forming is done through a bugle testing with speci mens of SUS430 sheet metal, using a neodymium-glass laser of pulse energy 10J~ 3 0J and duration of 20 ns (FWHM). The investigation revealed that the plastic de formation during the laser shock forming is characterized as ultrahigh strain ra te up to 10 7sec -1. We indicate that plastic deformation increases nonlin early when the energy density of the laser varies. By investigating the hardness and residual stress of the surfaces, we conclude that laser shock forming is a combination technique of laser shock strengthening and metal forming for introdu cing a strain harden and a compressive residual stress on the surface of the wor k-piece, and the treated surface by laser shock forming has good properties in fatigue and corrosion resistance. This technique can achieve forming wit h or without mould. 展开更多
关键词 laser shock wave metal sheet forming ultrahigh strain rate residual stresses
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NC INCREMENTAL SHEET METAL FORMING PROCESS AND VERTICAL WALL SQUARE BOX FORMING 被引量:2
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作者 ZhouLiuru MoJianhua XiaoXiangzhi 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第3期442-445,共4页
The forming principle and deformation analysis of NC incremental sheet metalforming process as well as the process planning, experiment and key process parameters of verticalwall square box forming are presented. Beca... The forming principle and deformation analysis of NC incremental sheet metalforming process as well as the process planning, experiment and key process parameters of verticalwall square box forming are presented. Because the deformation of sheet metal only occurs around thetool head and the deformed region is subjected to stretch deformation, the deformed region of sheetmetal thins, and surface area increases. Sheet metal forming stepwise is to lead to the whole sheetmetal deformation. The forming half-apex angle 9 and corner radius R are the main processparameters in NC incremental forming of vertical wall square box. According to sine law, a verticalwall square box can't be formed by NC incremental sheet metal forming process in a single process,rather, it must be formed in multi processes. Thus, the parallel line type tool path process methodis presented to form the vertical wall square box, and the experiment and analysis are made toverify it. 展开更多
关键词 Sheet metal forming NC incremental forming Dieless forming Vertical wallsquare box forming
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DEFORMATION ANALYSIS OF SHEET METAL SINGLE-POINT INCREMENTAL FORMING BY FINITE ELEMENT METHOD SIMULATION 被引量:3
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作者 MA Linwei MO Jianhua 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2008年第1期31-35,共5页
Single-point incremental forming (SPIF) is an innovational sheet metal forming method without dedicated dies, which belongs to rapid prototyping technology. In generalizing the SPIF of sheet metal, the deformation a... Single-point incremental forming (SPIF) is an innovational sheet metal forming method without dedicated dies, which belongs to rapid prototyping technology. In generalizing the SPIF of sheet metal, the deformation analysis on forming process becomes an important and useful method for the planning of shell products, the choice of material, the design of the forming process and the planning of the forming tool. Using solid brick elements, the finite element method(FEM) model of truncated pyramid was established. Based on the theory of anisotropy and assumed strain formulation, the SPIF processes with different parameters were simulated. The resulted comparison between the simulations and the experiments shows that the FEM model is feasible and effective. Then, according to the simulated forming process, the deformation pattern of SPIF can be summarized as the combination of plane-stretching deformation and bending deformation. And the study about the process parameters' impact on deformation shows that the process parameter of interlayer spacing is a dominant factor on the deformation. Decreasing interlayer spacing, the strain of one step decreases and the formability of blank will be improved. With bigger interlayer spacing, the plastic deformation zone increases and the forming force will be bigger. 展开更多
关键词 Sheet metal incremental forming DEformATION Finite element method(FEM) Numerical simulation
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Simulation and prediction of microstructure in hot forming of metals 被引量:2
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作者 陈慧琴 张巧丽 +1 位作者 刘建生 郭会光 《中国有色金属学会会刊:英文版》 EI CSCD 2000年第4期465-468,共4页
The evolution of microstructure seriously influences the forming processes and the quality of forgings in metal hot forming processes, it is therefore desirable to gain information on the microstructure evolution of a... The evolution of microstructure seriously influences the forming processes and the quality of forgings in metal hot forming processes, it is therefore desirable to gain information on the microstructure evolution of a process by means of computer simulation, not by conventional trial and error method that is time consuming, expensive and does not always lead to optimum results. Models for microstructural simulation and prediction were set up according to the evolution of microstructure during hot forming and cooling processes. The expanding extrusion complex hot forming and cooling processes, as an example, were simulated. 展开更多
关键词 metal HOT forming MICROSTRUCTURAL simulation quality prediction
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STUDY ON THE FINITE ELEMENT NUMERICAL SIMULATION OF SHEET METAL FORMING 被引量:2
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作者 J.L.Song D.J.Hu +2 位作者 Z.L.Chang T.Y.Li Z.B.Jiang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第3期299-302,共4页
Based on the Finite Element Theory of Rigid Plastic,relevant problems during plas-tic simulation on sheet metal forming were technologically studied and simplified;a simplified model of the blank holder during the dra... Based on the Finite Element Theory of Rigid Plastic,relevant problems during plas-tic simulation on sheet metal forming were technologically studied and simplified;a simplified model of the blank holder during the drawing process was established and the effects of related parameters on the forming processes were also studied.At the same time,a finite--element numerical simulation program SPID was developed.The distribution of strain and relationship of stress--stroke simulated were compared with experimented,the results are well coincided with each other.It is verified that the analytical program is reliable. 展开更多
关键词 sheet metal forming FINITE-ELEMENT numerical simulation
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Theory and Method of Optimum Path Forming for Sheet Metal 被引量:2
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作者 蔡中义 李明哲 冯肇华 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2001年第2期118-122,共5页
Ideal forming results will be achieved if the sheet metal is formed along an optimum forming path. Such a path can be realized by multi-point forming technique. On the basis of the theory of the ideal forming path (or... Ideal forming results will be achieved if the sheet metal is formed along an optimum forming path. Such a path can be realized by multi-point forming technique. On the basis of the theory of the ideal forming path (or minimum plastic work path), the concept of an optimum forming path is proposed in this paper. The forming path can be described by the initial configuration, objective configuration and a series of intermediate configurations. According to the deformation theory and constitutive equation in ideal path forming, a finite element method to calculate the initial configuration is set up. The functional to determinate intermediate configurations is introduced and the numerical method to solve the configuration is presented. Based on the method presented in the paper, multi-step multi-point forming tests for sheet metal are designed. The test results demonstrate that when the sheet is deformed along an approximate optimum forming path, the maximum deformation curvature for the sphere objective shape and saddle objective shape are 11%∼40% and 15%∼50% greater than those of a sheet deformed along a common path respectively. 展开更多
关键词 Finite element method metal forming Numerical methods Plastic deformation
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EXPERIMENTAL TESTING OF DRAW-BEAD RESTRAINING FORCE IN SHEET METAL FORMING 被引量:2
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作者 J.H.Yang J.Chen +1 位作者 D.N.He X.Y.Ruan 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2003年第1期46-50,共5页
Due to complexities of draw-bead restraining force calculated according to theory and depending on sheet metal forming properties experiment testing system, a simplified method to calculate draw-bead restraining force... Due to complexities of draw-bead restraining force calculated according to theory and depending on sheet metal forming properties experiment testing system, a simplified method to calculate draw-bead restraining force is put forward by experimental method in cup-shaped drawing process. The experimental results were compared with numerical results and proved agreement. It shows the method is effective. 展开更多
关键词 sheet metal forming draw-bead restraining force numerical simulation
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Experimental Investigation of the Effect of the Material Damage Induced in Sheet Metal Forming Process on the Service Performance of 22MnB5 Steel 被引量:7
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作者 ZHUANG Weimin XIE Dongxuan CHEN Yanhong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2016年第4期747-755,共9页
The use of ultra-high strength steels through sheet metal forming process offers a practical solution to the lightweight design of vehicles.However,sheet metal forming process not only produces desirable changes in ma... The use of ultra-high strength steels through sheet metal forming process offers a practical solution to the lightweight design of vehicles.However,sheet metal forming process not only produces desirable changes in material properties but also causes material damage that may adversely influence the service performance of the material formed.Thus,an investigation is conducted to experimentally quantify such influence for a commonly used steel(the 22MnB5 steel) based on the hot and cold forming processes.For each process,a number of samples are used to conduct a uniaxial tensile test to simulate the forming process.After that,some of the samples are trimmed into a standard shape and then uniaxially extended until fracture to simulate the service stage.Finally,a microstructure test is conducted to analyze the microdefects of the remaining samples.Based on the results of the first two tests,the effect of material damage on the service performance of 22MnB5 steel is analyzed.It is found that the material damages of both the hot and cold forming processes cause reductions in the service performance,such as the failure strain,the ultimate stress,the capacity of energy absorption and the ratio of residual strain.The reductions are generally lower and non-linear in the former process but higher and linear in the latter process.Additionally,it is found from the microstructure analysis that the difference in the reductions of the service performance of 22MnB5 by the two forming processes is driven by the difference in the micro damage mechanisms of the two processes.The findings of this research provide a useful reference in terms of the selection of sheet metal forming processes and the determination of forming parameters for 22MnB5. 展开更多
关键词 material damage sheet metal forming ultra-high strength steel 22MnB5 steel
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Zr-Co(Cu)-Al bulk metallic glasses with optimal glass-forming ability and their compressive properties 被引量:3
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作者 Masoud MOHAMMADI RAHVARD Morteza TAMIZIFAR Seyed Mohammad Ali BOUTORABI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第8期1543-1552,共10页
The formation of bulk metallic glasses(BMGs) in the ternary Zr(56) Co(28-x)Al(16) and quaternary Zr(56) Co(28-x)CuxAl16(x=2, 4, 5, 6, 7, mole fraction, %) glassy alloys was investigated via the copper mo... The formation of bulk metallic glasses(BMGs) in the ternary Zr(56) Co(28-x)Al(16) and quaternary Zr(56) Co(28-x)CuxAl16(x=2, 4, 5, 6, 7, mole fraction, %) glassy alloys was investigated via the copper mold suction casting method. The main purpose of this work was to locate the optimal BMG-forming composition for the quaternary Zr Co(Cu)Al alloys and to improve the plasticity of the parent alloy. The X-ray diffractometry(XRD), transmission electron microscopy(TEM) and differential scanning calorimetry(DSC) were used to investigate the glassy alloys structure and their glass forming ability(GFA). In addition, the compression test, microhardness, nano-indentation and scanning electron microscopy(SEM) were utilized to discuss the possible mechanisms involved in the enhanced plasticity achievement. The highest GFA among Cu-containing alloys was found for the Zr(56) Co(22) Cu6 Al(16) alloy, which was similar to that of the base alloy. Furthermore, the plasticity of the base alloy increased significantly from 3.3% to 6% for the Zr(56) Co(22) Cu)6 Al(16) BMG. The variations in the plasticity and GFA of the alloys were discussed by considering the positive heat of mixing within Cu and Co elements. 展开更多
关键词 bulk metallic glass zirconium base alloy glass forming ability PLASTICITY
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TOOL PATH GENERATION BASED ON STL FILE FOR SHEET METAL DIELESS FORMING 被引量:1
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作者 LiuJie MoJianhua 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2004年第2期230-232,共3页
Sheet metal dieless forming is a new metal forming technology. Thistechnology adopts the principle of rapid prototyping technology, so it can form sheet metal partswithout traditional die and moulds. According to the ... Sheet metal dieless forming is a new metal forming technology. Thistechnology adopts the principle of rapid prototyping technology, so it can form sheet metal partswithout traditional die and moulds. According to the characteristic of sheet metal dieless formingtechnology a new way of tool path generation based on the STL file for sheet metal dieless formingis proposed. 展开更多
关键词 Sheet metal Ddieless forming Tool path STL file
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