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Prediction of mechanical properties for deep drawing steel by deep learning 被引量:2
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作者 Gang Xu Jinshan He +2 位作者 Zhimin Lü Min Li Jinwu Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第1期156-165,共10页
At present,iron and steel enterprises mainly use“after spot test ward”to control final product quality.However,it is impossible to realize on-line quality predetermining for all products by this traditional approach... At present,iron and steel enterprises mainly use“after spot test ward”to control final product quality.However,it is impossible to realize on-line quality predetermining for all products by this traditional approach,hence claims and returns often occur,resulting in major eco-nomic losses of enterprises.In order to realize the on-line quality predetermining for steel products during manufacturing process,the predic-tion models of mechanical properties based on deep learning have been proposed in this work.First,the mechanical properties of deep drawing steels were predicted by using LSTM(long short team memory),GRU(gated recurrent unit)network,and GPR(Gaussian process regression)model,and prediction accuracy and learning efficiency for different models were also discussed.Then,on-line re-learning methods for transfer learning models and model parameters were proposed.The experimental results show that not only the prediction accuracy of optimized trans-fer learning models has been improved,but also predetermining time was shortened to meet real time requirements of on-line property prede-termining.The industrial production data of interstitial-free(IF)steel was used to demonstrate that R2 value of GRU model in training stage reaches more than 0.99,and R2 value in testing stage is more than 0.96. 展开更多
关键词 machine learning recurrent natural network transfer learning on-line prediction deep drawing steel mechanical properties
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Microstructure and texture of commercially pure titanium in cold deep drawing 被引量:6
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作者 张绪虎 唐斌 +3 位作者 张下陆 寇宏超 李金山 周廉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第3期496-502,共7页
The development of microstructure and texture during cold deep drawing of commercially pure titanium(CP-Ti) was investigated.Three parts,stretching region,drawing region and flange region,were sequentially formed in... The development of microstructure and texture during cold deep drawing of commercially pure titanium(CP-Ti) was investigated.Three parts,stretching region,drawing region and flange region,were sequentially formed in the deep drawing process of the hemispheric surface part,with reference to deformation modes and strain regimes.Results show that the plastic strain is accommodated by dislocation slip and deformation twinning in the whole deep drawing process.The texture of the CP-Ti sheet and its drawn part consists of rolling texture component and recrystallization texture component.The intensity and type of the initial texture varied during the drawing process are related to the production of deformation twinning and dislocation slip.Twinning weakens the initial texture by randomizing the orientations of crystals,especially for the recrystallization texture.The recrystallization texture in the drawing region disappears due to the significant forming of twinning.Furthermore,over drawing would result in the predominance of dislocation slip and the texture is strengthened. 展开更多
关键词 pure titanium deep drawing MICROSTRUCTURE TEXTURE
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Effect of friction coefficient in deep drawing of AA6111 sheet at elevated temperatures 被引量:7
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作者 马闻宇 王宝雨 +2 位作者 傅垒 周靖 黄鸣东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第7期2342-2351,共10页
The effect of friction coefficient on the deep drawing of aluminum alloy AA6111 at elevated temperatures was analyzed based on the three conditions using the finite element analysis and the experimental approach.Resul... The effect of friction coefficient on the deep drawing of aluminum alloy AA6111 at elevated temperatures was analyzed based on the three conditions using the finite element analysis and the experimental approach.Results indicate that the friction coefficient and lubrication position significantly influence the minimum thickness,the thickness deviation and the failure mode of the formed parts.During the hot forming process,the failure modes are draw mode,stretch mode and equi-biaxial stretch mode induced by different lubrication conditions.In terms of formability,the optimal value of friction coefficient determined in this work is 0.15.At the same time,the good agreement is performed between the experimental and simulated results.Fracture often occurs at the center of cup bottom or near the cup corner in a ductile mode or ductile-brittle mixed mode,respectively. 展开更多
关键词 aluminum alloy deep drawing friction coefficient FORMABILITY fracture surface
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EFFECTS OF SPECIFIED BLANK SIZE ON BODY WRINKLING DURING HYDRODYNAMIC DEEP DRAWING OF TAPERED RECTANGULAR BOX 被引量:21
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作者 L. H. Lang, D. C. Kang, S. H. Zhang, Z. R. Wang, S. J. Yuan, K. B. Nielsen and J. Dancket 1) Department of Materials Engineering, Harbin Institute of Technology, Harbin 150001, China 2) Aalberg University, Denmark 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第2期476-480,共5页
In this paper, the forming features of tapered rectangular box during hydrodynamic deep drawing are studied by means of FEM.The effect rules of square blank corner corner amount on body wrinkling are recognized and co... In this paper, the forming features of tapered rectangular box during hydrodynamic deep drawing are studied by means of FEM.The effect rules of square blank corner corner amount on body wrinkling are recognized and corresponding methods are discussed. At last, the results of FEM are verified by experi- ment. 展开更多
关键词 sheet metal forming hydrodynamic deep drawing FEM
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A LOOP DRAWBEAD RESTRAINING FORCE MODEL IN SHEET METAL DEEP DRAWING PROCESS 被引量:13
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作者 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 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2001年第5期380-386,共7页
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 ... 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. 展开更多
关键词 DRAWBEAD restraining force sheet metal deep drawing
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RESEARCH ON THE EVALUATION METHOD OF FRICTION AND LUBRICATION IN DEEP DRAWING 被引量:13
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作者 D.N.He X.F.Yin +4 位作者 H.Z.Thao D.Lv X.Y.Ruan J.L.Cheng J.Y.Jiang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第2期439-445,共7页
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... 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. 展开更多
关键词 deep drawing probe test method friction and lubrication evaluation method
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Effects of Loading Paths on Hydrodynamic Deep Drawing with Independent Radial Hydraulic Pressure of Aluminum Alloy Based on Numerical Simulation 被引量:10
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作者 Xiaojing LIU Yongchao XU Shijian YUAN 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第3期395-399,共5页
In order to meet the forming demands for low plasticity materials and large height-diameter ratio parts, a new process of hydrodynamic deep drawing (HDD) with independent radial hydraulic pressure is proposed. To in... In order to meet the forming demands for low plasticity materials and large height-diameter ratio parts, a new process of hydrodynamic deep drawing (HDD) with independent radial hydraulic pressure is proposed. To investigate the effects of loading paths on the HDD with independent radial hydraulic pressure, the forming process of 5A06 aluminum alloy cylindrical cup with a hemispherical bottom was studied by numerical simulation. By employing the dynamic explicit analytical software ETA/Dynaform based on LS-DYNA3D, the effects of loading paths on the sheet-thickness distribution and surface quality were analyzed. The corresponding relations of the radial hydraulic pressure loading paths and the part's strain status on the forming limit diagram (FLD) were also discussed. The results indicated that a sound match between liquid chamber pressure and independent radial hydraulic pressure could restrain the serious thinning at the hemisphere bottom and that through adjusting radial hydraulic pressure could reduce the radial tensile strain and change the strain paths. Therefore, the drawing limit of the aluminum cylindrical cup with a hemispherical bottom could be increased significantly. 展开更多
关键词 Hydrodynamic deep drawing Numerical simulation Independent radial hydraulic pressure 5A06 aluminum alloy
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Influence of variables in deep drawing of AA 6061 sheet 被引量:8
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作者 S.RAJU G.GANESAN R.KARTHIKEYAN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第10期1856-1862,共7页
Deep drawing is one of the most important processes for forming sheet metal parts.It is widely used for mass production of cup shapes in automobile,aerospace and packaging industries.Cup drawing,besides its importance... Deep drawing is one of the most important processes for forming sheet metal parts.It is widely used for mass production of cup shapes in automobile,aerospace and packaging industries.Cup drawing,besides its importance as forming process,also serves as a basic test for the sheet metal formability.The effect of equipment and tooling parameters results in complex deformation mechanism.Existence of thickness variation in the formed part may cause stress concentration and may lead to acceleration of damage.Using TAGUCHI's signal-to-noise ratio,it is determined that the die shoulder radius has major influence followed by blank holder force and punch nose radius on the thickness distribution of the deep drawn cup of AA 6061 sheet.The optimum levels of the above three factors,for the most even wall thickness distribution,are found to be punch nose radius of 3 mm,die shoulder radius of 8 mm and blank holder force of 4 kN. 展开更多
关键词 deep drawing aluminium alloy thickness distribution signal to noise ratio
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Investigation of SUS304 Stainless Steel with Warm Hydro-mechanical Deep Drawing 被引量:7
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作者 Yongchao XU, Dachang KANG and Shihong ZHANGSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaShihong ZHANGInstitute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第1期92-93,共2页
Basing on warm mechanical property of SUS304 stainless steel and hydro-mechanical deep drawing process, warm hydro-mechanical deep drawing process is proposed and discussed with experiments in this paper. The experime... Basing on warm mechanical property of SUS304 stainless steel and hydro-mechanical deep drawing process, warm hydro-mechanical deep drawing process is proposed and discussed with experiments in this paper. The experiments are performed at four different temperatures. The results show that the formability of stainless steel is improved under the condition of warm temperature. Warm hydro-mechanical deep drawing raises limiting drawing ratio of SUS304 effectively, and limiting drawing ratio 3.3 is obtained, which is beyond 2.0 with conventional deep drawing. The temperature of 90℃ is beneficial to the forming of SUS304 stainless steel, the strain-induced martensite is controlled effectively, and the thickness distribution is more uniform. 展开更多
关键词 SUS304 stainless steel Warm hydro-mechanical deep drawing FORMING Cylindrical cup
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Process window diagram of conical cups in hydrodynamic deep drawing assisted by radial pressure 被引量:5
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作者 Abbas HASHEMI Mohammad HOSEINPOUR GOLLO S.M.Hossein SEYEDKASHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第9期3064-3071,共8页
Major defects in forming of conical cups are wrinkles and rupture.Hydrodynamic deep drawing assisted by radial pressure(HDDRP) is a sheet hydroforming process for production of shell cups in one step.In this work,pr... Major defects in forming of conical cups are wrinkles and rupture.Hydrodynamic deep drawing assisted by radial pressure(HDDRP) is a sheet hydroforming process for production of shell cups in one step.In this work,process window diagrams(PWDs) for Al1050-O,pure copper and DIN 1623 St14 steel are obtained for HDDRP process.The PWD is determined to provide a quick assessment of part producibility for sheet hydroforming process.Finite element method is used for this purpose considering the process parameters including pressure path,and the blank material and its thickness.Numerical results are validated by experiments.It is shown that the sheets with less initial thickness and higher strength show better formability and uniformity of thickness distribution on final product.The results demonstrate that the obtained PWD can predict appropriate forming area and probability of rupture or wrinkling occurrence under different pressure loading paths. 展开更多
关键词 conical cups hydrodynamic deep drawing finite element simulation process window diagram
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Hydrodynamic deep drawing of double layered conical cups 被引量:4
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作者 Alireza JALIL Mohammad HOSEINPOUR GOLLO +1 位作者 M.Morad SHEIKHI S.M.Hossein SEYEDKASHI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期237-247,共11页
Hydrodynamic deep drawing assisted by radial pressure is an advanced sheet forming technology with great advantages such as higher drawing ratio, good surface quality and higher dimensional accuracy. In this process, ... Hydrodynamic deep drawing assisted by radial pressure is an advanced sheet forming technology with great advantages such as higher drawing ratio, good surface quality and higher dimensional accuracy. In this process, both the bottom surface and the peripheral edge of sheets are under hydrodynamic pressure, so that the forming procedure is more uniform with low failure probability. Multi-layered sheets with complex geometries could be formed more easily with this technique compared with other traditional methods. Rupture is the main irrecoverable failure form in sheet forming processes. Prediction of rupture occurrence is of great importance for determining and optimizing the proper process parameters. In this research, a theoretical model was proposed to calculate the critical rupture pressure in production of double layered conical parts with hydrodynamic deep drawing process assisted by radial pressure. The effects of other process parameters on critical rupture pressure, such as punch tip radius, drawing ratio, coefficient of friction, sheet thickness and material properties were also discussed. The proposed model was compared with finite element simulation and validated by experiments on Al1050/St13 double layered sheets, where a good agreement was found with analytical results. 展开更多
关键词 hydrodynamic deep drawing radial pressure double layered sheet conical cup critical pressure
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DETERMINATION OF BLANK HOLDER FORCE IN SHEET METAL DEEP DRAWING PROCESS 被引量:5
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作者 Y.J.Luo Y.Q.Zhang D.N.He 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2003年第1期31-34,共4页
Blank holder force (BHF) is an important measure to control the sheet metal forming. BHF is identified quickly using artificial neural network (ANN) on the basis of its analytical description. And critical rupture and... Blank holder force (BHF) is an important measure to control the sheet metal forming. BHF is identified quickly using artificial neural network (ANN) on the basis of its analytical description. And critical rupture and wrinkle BHF curves are given. A close-loop control system is established to finish the forming process. 展开更多
关键词 blank holder force sheet metal deep drawing artificial neural network
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Formation of Aluminum-magnesium Alloy Cup by Hydrodynamic Deep Drawing with Twin-loading Paths 被引量:3
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作者 刘晓晶 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第2期193-197,共5页
In order to overcome the limitation of hydro-rim deep drawing, a new process of hydrodynamic deep drawing (HDD) with independent radial hydraulic pressure was proposed. By employing the dynamic explicit analytical s... In order to overcome the limitation of hydro-rim deep drawing, a new process of hydrodynamic deep drawing (HDD) with independent radial hydraulic pressure was proposed. By employing the dynamic explicit analytical software ETA/DynaformS.5 which is based on LS-DYNA3D, the effects of independent radia! hydraulic pressure on the stress, strain and the sheet-thickness of aluminum-magnesium cylindrical cup with a hemispherical bottom were analyzed by numerical simulation. The feature of stress distribution is that there exists a stress-dividing circle in the flange, and the radius of dividing circle was determined by theoretical analysis and stimulation. The experimental results indicate that the reasonable match of independent radial hydraulic pressure and liquid chamber pressure can effectively reduce the thinning at the bottom of hemisphere, decrease the radial stress-strain, and improve the drawing limit of aiuminum-magnesium alloy cylindrical cup. 展开更多
关键词 hydrodynamic deep drawing numerical simulation independent radial hydraulic pressure 5A06 aluminum-magnesium alloy
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Experimental Investigation on Micro Deep Drawing of Stainless Steel Foils with Different Microstructural Characteristics 被引量:2
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作者 Jingwei Zhao Tao Wang +4 位作者 Fanghui Jia Zhou Li Cunlong Zhou Qingxue Huang Zhengyi Jiang 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2021年第2期179-189,共11页
In the present work,austenitic stainless steel(ASS)304 foils with a thickness of 50μm were first annealed at temperatures ranging from 700 to 1100℃for 1 h to obtain different microstructural characteristics.Then the... In the present work,austenitic stainless steel(ASS)304 foils with a thickness of 50μm were first annealed at temperatures ranging from 700 to 1100℃for 1 h to obtain different microstructural characteristics.Then the effects of microstructural characteristics on the formability of ASS 304 foils and the quality of drawn cups using micro deep drawing(MDD)were studied,and the mechanism involved was discussed.The results show that the as-received ASS 304 foil has a poor formability and cannot be used to form a cup using MDD.Serious wrinkling problem occurs on the drawn cup,and the height profile distribution on the mouth and the symmetry of the drawn cup is quite non-uniform when the annealing temperature is 700℃.At annealing temperatures of 900 and 950℃,the drawn cups are both characterized with very few wrinkles,and the distribution of height profile,symmetry and mouth thickness are uniform on the mouths of the drawn cups.The wrinkling becomes increasingly significant with a further increase of annealing temperature from 950 to 1100℃.The optimal annealing temperatures obtained in this study are 900 and 950℃for reducing the generation of wrinkling,and therefore improving the quality of drawn cups.With non-optimized microstructure,the distribution of the compressive stress in the circumferential direction of the drawn foils becomes inhomogeneous,which is thought to be the cause of the occurrence of localized deformation till wrinkling during MDD. 展开更多
关键词 MICROFORMING Micro deep drawing Stainless steel foils WRINKLING ANNEALING Microstructure
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Finite element simulation on the deep drawing of titanium thin-walled surface part 被引量:2
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作者 GAO Enzhi, LI Hongwei, KOU Hongchao, CHANG Hui, LI Jinshan, and ZHOU Lian State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China 《Rare Metals》 SCIE EI CAS CSCD 2010年第1期108-113,共6页
The deep drawing of titanium thin-walled surface part was simulated based on a self-developed three-dimensional finite element model. After an investigation on forming rules, a virtual orthogonal experimental design w... The deep drawing of titanium thin-walled surface part was simulated based on a self-developed three-dimensional finite element model. After an investigation on forming rules, a virtual orthogonal experimental design was adopted to determine the significance of processing parameters, such as die radius, blank holder force, and friction coefficient, on the forming process. The distributions of thickness and equivalent plastic strain of the drawn part were evaluated. The results show that die radius has a relative major influence on the deep drawing process, followed by friction coefficient and blank holder force. 展开更多
关键词 deep drawing titanium alloy finite element simulation orthogonal experiment processing parameters
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Correlation of morphological anisotropy and Lankford value of deep drawing sheets hot-rolled by compact strip production 被引量:1
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作者 Shu-li Li Run Wu +4 位作者 Yuan-zheng Wei Zhi-fang Wu Xue-jun Zhou Yong-fu Zhang Cruang Xu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2012年第10期934-938,共5页
Cold-rolled steel sheets in automotive applications require an excellent deep draw ability, which is characterized by the Lankford value (r-value). In this study, a correlation was identified between r-value and pan... Cold-rolled steel sheets in automotive applications require an excellent deep draw ability, which is characterized by the Lankford value (r-value). In this study, a correlation was identified between r-value and pancake-shaped grain flatness which is indicated as the ratio of grain diameter in the rolling direction (RD) and normal direction (ND) of sheets (dr/dn). A mathematical model ( r = e^0.345(dn^1/2-dr^1/2) ) was developed to calculate r-value by the microstructure of steel sheets hot-rolled by compact strip production (CSP). It is shown that the r-value is higher, if the microstructure of steel sheet is of pancake-shaped grains elongated in the rolling direction. The calculated r-value is confirmed to fit exactly to the measured one from the large-scale production. 展开更多
关键词 cold rolling compact strip production (CSP) steel sheets deep drawing ANISOTROPY Lankford values microstructure
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Deep Drawing Process Using a Tractrix Die for Manufacturing Liners for a CNG High-Pressure Vessel(Type Ⅱ) 被引量:1
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作者 Gun‑Young Park Hyo‑Seo Kwak +1 位作者 Hyo‑Seong Jang Chul Kim 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2022年第1期132-143,共12页
The liner of a CNG pressure vessel is manufactured by a DDI(deep drawing and ironing)process for the cylinder part,which is a continuous process that includes a drawing process to reduce the diameter of the billet and... The liner of a CNG pressure vessel is manufactured by a DDI(deep drawing and ironing)process for the cylinder part,which is a continuous process that includes a drawing process to reduce the diameter of the billet and a subsequent ironing process to reduce the thickness of the billet.A tractrix die used in the 1^(st) deep drawing allows the blank to flow smoothly by decreasing the punch load and radial tensile stress occurring in the workpiece.It also increases the draw ratio compared to conventional dies,but it causes forming defects.In this study,a shape coefficient(S_(c))is proposed for the tractrix die using the blank diameter(D_(0)),inflow diameter of the workpiece(d_(i)),and inflow angle of the workpiece(θ)for design of the tractrix die.The effects of the thickness and inflow angle of the workpiece on wrinkling and folding were investigated through FEA.Also,a discriminant is proposed for the relative radial stress(σ)generated during the deep drawing process using the tractirx die and used to predict fracture.Based on the results,the blank thickness,the draw ratio,and the inflow of the workpiece angle in the 1^(st) deep drawing process are suggested,and the number of operations in the DDI process was reduced from 6 to 4.This improves the productivity and reduces the manufacturing cost. 展开更多
关键词 Tractrix die deep drawing WRINKLING FOLDING LDR(Limit draw ratio) FEM
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Numerical Study on Welding Line Behavior of Deep Drawing TWB Process 被引量:1
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作者 WANG Li-juan WANG Guo-dong LIU Xiang-hua WU Ming-tang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2007年第5期36-38,46,共4页
The FEM technology is used to analyze the welding line movement behavior of deep drawing TWB sheet with different thickness. It is found that high stress fields are concentrated around the welding line and large resid... The FEM technology is used to analyze the welding line movement behavior of deep drawing TWB sheet with different thickness. It is found that high stress fields are concentrated around the welding line and large residual stresses are left. The effect of the welding line movement is like a rigid string and the selected nodes of the thin part near the welding line show the related larger strain. 展开更多
关键词 welding line BEHAVIOR deep drawing TWB
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Deep Drawing of Titanium Alloy TC4 Sheet at Hot Temperatures 被引量:1
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作者 郭斌 孙圣迪 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第S1期128-131,共4页
The true strain-stress curves of TC4 titanium sheet were obtained by uniaxial tensile tests under different experimental conditions,and the effects of forming temperature and strain speed on the rheological stress and... The true strain-stress curves of TC4 titanium sheet were obtained by uniaxial tensile tests under different experimental conditions,and the effects of forming temperature and strain speed on the rheological stress and hot deforming capacity were analyzed.The Forming experience for titanium alloy TC4 sheet with 1mm thickness was executed to investigate the hot forming technology of Thin-walled cylindrical cup of titanium alloy.The results showed that the softening mechanism was dynamic re-crystallization,flow curves of the TC4 alloy were characterized by a linear increase until regular single peak after which flow softening was observed.And the flow stress decreased with increasing temperature and decreasing strain rate.as the forming temperature increased,the limit drawing coefficient would decreased first and then increased,there would be a minimum 0.461 when the temperature was 770 ℃,springback would be becoming smaller,but phenomenon of lug do not Significant improvement. 展开更多
关键词 TC4 flow stress deep drawing
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Numerical Analysis of Hydroforming Deep Drawing of Conical Cup 被引量:1
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作者 Yongming KONG Xianbin ZHOU and Min LI Research Center of Sheet Metal Forming, School of Mechanical Engineering & Automation, Beijing University of Aeronautics & Astronautics, Beijing 100083, China 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2001年第1期131-132,共2页
Aided by the FE-code. analysis is carried to find the proper hydroforming deep-drawing condition for the perfect forming of a conical cup that can not be drawn successfully by conventional deep drawing method. Hydraul... Aided by the FE-code. analysis is carried to find the proper hydroforming deep-drawing condition for the perfect forming of a conical cup that can not be drawn successfully by conventional deep drawing method. Hydraulic counter pressure must be reasonably controlled, otherwise defects such as fracture and wrinkling can not be avoided. Therefore, the forming procedure is divided into three stages, and the counter pressure is adjusted intentionally to make the blank clamped onto the punch at a suitable time, then deformation at dangerous area is resisted by the effect of the counter pressure and the conical cup can be formed without defects. 展开更多
关键词 Numerical Analysis of Hydroforming deep drawing of Conical Cup FIGURE
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