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Technology and Experiments of 42CrMo Bearing Ring Forming Based on Casting Ring Blank 被引量:17
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作者 LI Yongtang JU Li +3 位作者 QI Huiping ZHANG Feng CHEN Guozhen WANG Mingli 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2014年第2期418-427,共10页
Bearing ring is the crucial component of bearing. With regard to such problems as material waste, low efficiency and high energy consumption in current process of producing large bearing ring, a new process named "ca... Bearing ring is the crucial component of bearing. With regard to such problems as material waste, low efficiency and high energy consumption in current process of producing large bearing ring, a new process named "casting-rolling compound forming technology" is researched by taking the typical 42CrMo slew bearing as object. Through theoretical analysis, the design criteria of the main casting-rolling forming parameters are put forward at first. Then the constitutive relationship model of as-cast 42CrMo steel and its mathematical model of dynamic recrystallization are obtained according to the results of the hot compression experiment. By a coupled thermal-mechanical finite element model for radial-axial rolling of bearing ring, the fraction of dynamic recrystallization is calculated and recrystallized grains size are predicated. Meanwhile, the effects of the initial rolling temperature and feed rate of idle roll on material microstructure evolution are analyzed. Finally, the industrial rolling experiment is designed and performed, based on the simulation results. In addition, mechanical and metallographic tests are conducted on rolled bearing ring to get the mechanical parameters and metallographic structure. The experimental data and results show that the mechanical properties of bearing ring produced by casting-rolling compound forming technology are up to industrial standard, and a qualified bearing ring can be successfully formed by employing this new technology. Through the study, a process of forming large bearing ring directly by using casting ring blank is obtained, which could provide an effective theoretical guidance for manufacturing large ring parts. It also has an edge in saving material, lowering energy and improving efficiency. 展开更多
关键词 bearing ring 42CrMo casting ring blank casting-rolling compound forming microstructure evolution
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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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Effect of blank holder pressure on viscous pressure forming aluminum alloy ladder parts 被引量:1
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作者 王忠金 王新云 王仲仁 《中国有色金属学会会刊:英文版》 CSCD 2002年第1期109-114,共6页
Viscous pressure forming (VPF), is suitable for forming difficult to form sheet metal parts. An investigation in the effect of blank holder pressure (BHP) on VPF aluminum alloy ladder parts was conducted. Based on exp... Viscous pressure forming (VPF), is suitable for forming difficult to form sheet metal parts. An investigation in the effect of blank holder pressure (BHP) on VPF aluminum alloy ladder parts was conducted. Based on experimental and numerical simulation results of the effect of BHP on dimensional accuracy, wall thickness reduction, forming pressure, material flow and defects (such as wrinkling and fracture) of specimens, the effect patterns of BHP load path on VPF ladder parts were explained. The limits of BHP corresponding to specimens with no defect and with wrinkling or fracture defect were determined. In the limits of formable BHP, the variable load path of BHP was beneficial to drawing blank into the die and decreasing wall thickness reduction of specimens. The experimental results show that the ladder parts of good surface fineness and high dimensional accuracy can be obtained by variable load paths of BHP. 展开更多
关键词 坯件夹住器 铝合金 粘性模压成型 阶梯部分 VPF
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Forming defects in aluminum alloy hot stamping of side-door impact beam 被引量:12
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作者 周靖 王宝雨 +2 位作者 林建国 傅垒 马闻宇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3611-3620,共10页
The forming defects, including thinning, rupture, wrinkling and springback, usually arising in producing a side-door impact beam, were investigated by trial and numerical simulation. A temperature-related constitutive... The forming defects, including thinning, rupture, wrinkling and springback, usually arising in producing a side-door impact beam, were investigated by trial and numerical simulation. A temperature-related constitutive model specific to the temperature range from 350 °C to 500 °C was established and used for the numerical simulation. The trial and numerical simulation were conducted to clarify the quantitative characteristics of forming defects and to analyze the effects of process parameters on the forming defects. Results show that the rupture situation is ameliorated and the springback is eliminated in the aluminum alloy hot stamping. The wrinkling severity decreases with increasing blank holder force (BHF), but the BHF greater than 15 kN causes the rupture at the deepest drawing position of workpiece. The forming defects are avoided with lubricant in the feasible ranges of process parameters: the BHF of 3 to 5 kN and the stamping speed of 50 to 200 mm/s. 展开更多
关键词 aluminum alloy hot stamping forming defects numerical simulation blank holder force
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Theoretical prediction and experimental investigation on formability of tailor-welded blanks 被引量:5
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作者 马向东 官英平 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期228-236,共9页
Based on the elastoplastic mechanical properties of the weld and heat affected zone metals obtained by a nanoindentation test, a theoretical calculation model was established for the forming limit diagram(FLD) of ta... Based on the elastoplastic mechanical properties of the weld and heat affected zone metals obtained by a nanoindentation test, a theoretical calculation model was established for the forming limit diagram(FLD) of tailor-welded blanks(TWBs) on the basis of plastic constitutive relations and Hosford yield criteria. Hemispherical punch bulging tests were performed to verify the FLD theoretical calculation results. The results demonstrated that not only the FLD theoretical calculation of base materials but also that of TWBs had a good agreement with their experiments. Besides, poorer formability of TWBs caused its FLD significantly lower than that of base materials. The theoretical calculation model offers a reliable approach to obtain the specific FLD of TWBs. 展开更多
关键词 tailor-welded blank forming limit diagram nanoindentation test hemispherical punch bulging test
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Study of Magnetic Force Distribution for Electromagnetic V-shape Bending Forming of Small Size Flat Sheet
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作者 Xiao-Wei Chen Wen-Ping Wang +5 位作者 Min Wan Long Pan An-Lin Long Wei-Ren Xiong Cheng-Long Shi Zhong-Yu Zhou 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2014年第1期25-31,共7页
Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on ... Electromagnetic V-shape bending of small size sheet blank is investigated numerically and experimentally. Three-dimensional electromagnetic field models are established to calculate the magnetic force distribution on the sheet by software ANSYS / EMAG. Series of electromagnetic V-shape bending forming experiments are presented,in which small size uniform pressure coil and big size round flat spiral coil are used. The results show that small size uniform pressure coil is not suitable for electromagnetic forming of small size flat sheet,and the coil is susceptible to failure such as bulging,ablation and cracking. When the plane dimension of round flat spiral coil is bigger than sheet blank sizes,the induced current crowding effect will be resulted which seriously influence the magnetic force distribution on the sheet. In this case,magnetic force distribution can be adjusted through the change of the relative position between coil and sheet,the desired deformation can be obtained finally. Therefore,big size round flat spiral coil can be well applied to electromagnetic V-shape bending forming of small size flat sheet. 展开更多
关键词 Electromagnetic forming Small size sheet blank Induced current crowding effect Magnetic force distribution
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火锅菜盆复合模设计
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作者 邹泽昌 谢宇玲 陈忠士 《模具工业》 2024年第9期28-30,36,共4页
根据火锅菜盆的尺寸、结构和材料厚度,对其冲压工艺进行分析,并设计了“落料+第1次成形+拉深”复合模、第2次成形单工序模、侧冲孔单工序模。在复合模中,120°的斜边可视为拉深工序的压边圈,将第1次成形120°夹角的工序排在拉... 根据火锅菜盆的尺寸、结构和材料厚度,对其冲压工艺进行分析,并设计了“落料+第1次成形+拉深”复合模、第2次成形单工序模、侧冲孔单工序模。在复合模中,120°的斜边可视为拉深工序的压边圈,将第1次成形120°夹角的工序排在拉深工序前。在第2次成形70°夹角的单工序模的下模中设计了活动顶板,与上模的成形凸模将120°的斜边压住,防止120°的斜边变形。在“落料+第1次成形+拉深”复合模和第2次成形单工序模中,在下模成形零件的底部设置橡胶垫块,在上模向下运动时橡胶垫块的弹力将材料顶住,同时给上模向下运动腾出空间,防止模具零件卡死。 展开更多
关键词 落料 拉深 成形 复合模
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差厚板U形件工艺孔成形性能仿真
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作者 胡贤磊 朱永胜 支颖 《东北大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第8期1080-1087,共8页
以冷冲压差厚板U形件作为研究对象,通过有限元仿真分析了工艺孔的位置、数量、尺寸以及形状对成形性能的影响.结果表明,差厚板在薄区侧壁处开孔时有利于减少侧壁的残余应力;差厚板的回弹与工艺孔在板件中的位置分布关系不大,与工艺孔的... 以冷冲压差厚板U形件作为研究对象,通过有限元仿真分析了工艺孔的位置、数量、尺寸以及形状对成形性能的影响.结果表明,差厚板在薄区侧壁处开孔时有利于减少侧壁的残余应力;差厚板的回弹与工艺孔在板件中的位置分布关系不大,与工艺孔的数量、半径及形状有关.从成形性能和回弹影响角度考虑,工艺孔优先选差厚板U形件端部的厚区与过渡区区域,如果必须在侧壁开孔,优选侧壁薄区区域.在相邻区域,工艺孔的数量尽量不超过2个,工艺孔尺寸小一些更合适,工艺孔形状沿轧制方向距离越小越合适. 展开更多
关键词 差厚板 工艺孔 U形件 冷冲压 成形性能 回弹
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深轮辐齿坯多工位闭式模锻材料流动规律研究
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作者 夏琴香 彭冲 +2 位作者 刘梅华 肖刚锋 †徐尔灵 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第9期35-41,共7页
探索闭式热模锻成形时材料的流动规律是控制充填不满等成形缺陷、获得高精度模锻件的理论基础。针对深轮辐齿坯件热模锻成形时易出现填充不满的问题,以某SCr420H深轮辐齿坯为研究对象,基于齿坯件结构分析,设计了“下料-加热-镦粗-预锻Ⅰ... 探索闭式热模锻成形时材料的流动规律是控制充填不满等成形缺陷、获得高精度模锻件的理论基础。针对深轮辐齿坯件热模锻成形时易出现填充不满的问题,以某SCr420H深轮辐齿坯为研究对象,基于齿坯件结构分析,设计了“下料-加热-镦粗-预锻Ⅰ-预锻Ⅱ-终锻”的多工位闭式热模锻工艺方案;基于Deform软件,构建了深轮辐齿坯件多工位闭式热模锻全流程有限元模拟模型;采用试验验证了有限元模型的可靠性,并对多工位闭式热模锻成形过程中材料的流动规律进行了研究。结果表明:镦粗比为3.7时,可获得外形良好的圆饼形预制坯,镦粗时受上下表面摩擦效应的影响,材料径向流动不均匀,在坯件腰部出现鼓形;预锻Ⅰ工位成形出用于定位的底面内凹结构,同时减小了后续工位材料填充难度;预锻Ⅱ和终锻成形时的材料流动规律相似,成形前期材料集中流向轮缘部分、成形中期主要流向轮毂部分、末期流向圆角处;终锻成形时未出现材料填充不满的缺陷,在成形后期,少量金属材料从终锻上下模的导向间隙中流出,形成纵向飞边。通过生产试验,成形出填充良好的深轮辐齿坯件,模拟数值获得温度与实际生产数值最大误差不超过3.15%,纵向飞边高度小于0.5 mm,零件各尺寸偏差均小于0.2 mm,验证了所设计多工位闭式模锻工艺的合理性。 展开更多
关键词 深轮辐齿坯 多工位闭式热模锻 材料流动 成形工艺 有限元模拟
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TC4钛合金复杂曲率蒙皮热成形失稳缺陷及消除方法
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作者 杨晓华 韩颖杰 +4 位作者 谢洪志 付和国 王会东 齐文 王英杰 《塑性工程学报》 CAS CSCD 北大核心 2024年第10期78-84,共7页
为解决钛合金复杂曲率板材零件的高精度成形技术性难题,以厚3.0 mm的TC4钛合金薄壁复杂曲率蒙皮作为研究对象,利用PAM-STAMP有限元分析软件对蒙皮零件进行热成形工艺仿真与分析。结果表明:仿真预测结果与试验结果均表现出零件会产生褶... 为解决钛合金复杂曲率板材零件的高精度成形技术性难题,以厚3.0 mm的TC4钛合金薄壁复杂曲率蒙皮作为研究对象,利用PAM-STAMP有限元分析软件对蒙皮零件进行热成形工艺仿真与分析。结果表明:仿真预测结果与试验结果均表现出零件会产生褶皱或死褶缺陷,导致零件无法正常交付使用。基于仿真数据,分析了复杂曲率蒙皮零件成形失稳缺陷的产生原因,采用一种新方法为零件热成形模具设计了压边装置,优化了成形效果。经实际生产验证可知,优化后的模具结构可以有效解决成形过程中产生的成形缺陷,成形后表面质量好、材料厚度分布均匀,且型面精度满足设计和装配的使用要求。 展开更多
关键词 钛合金 热成形 成形仿真 模具设计 压边装置
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基于Dynaform仿真拉深成形过程参数研究 被引量:3
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作者 孙钿科 王绍清 +2 位作者 于红娟 李芳 曲庆文 《机械科学与技术》 CSCD 北大核心 2014年第4期541-545,共5页
应用Dynaform仿真软件对金属板料进行了拉深过程的模拟分析,得到了压边力、拉深速度和摩擦系数对于拉深过程中板料成形速度的影响。板料成形速度决定拉深质量,在成形过程中压边力和拉深速度是可控参数,摩擦系数是在一定条件下可以干预... 应用Dynaform仿真软件对金属板料进行了拉深过程的模拟分析,得到了压边力、拉深速度和摩擦系数对于拉深过程中板料成形速度的影响。板料成形速度决定拉深质量,在成形过程中压边力和拉深速度是可控参数,摩擦系数是在一定条件下可以干预控制的参数,同时是多参数共同作用的表现,对成形质量和模具寿命影响较大。影响摩擦系数的主要因素除材料外,还有压边力、拉深速度及润滑状态,成形速度是影响润滑状态的关键因素。 展开更多
关键词 拉深 压边力 拉深速度 成形速度 摩擦系数
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基于Deform的精冲模具磨损特性研究 被引量:8
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作者 史双喜 李福涛 《润滑与密封》 CAS CSCD 北大核心 2015年第7期89-92,共4页
建立精冲模具磨损有限元分析模型,采用有限元软件Deform-3D对常温下的精冲凸模磨损进行仿真分析,研究模具材料的硬度、毛坯与模具间摩擦因数和成型载荷等工艺参数对模具磨损的影响。结果表明:凸模边缘的磨损严重,而侧面的磨损量较小;最... 建立精冲模具磨损有限元分析模型,采用有限元软件Deform-3D对常温下的精冲凸模磨损进行仿真分析,研究模具材料的硬度、毛坯与模具间摩擦因数和成型载荷等工艺参数对模具磨损的影响。结果表明:凸模边缘的磨损严重,而侧面的磨损量较小;最大磨损深度随着模具材料硬度的增大而减小,随着摩擦因数的增大而增大;反顶力也是影响对凸模磨损的重要因素,最大磨损深度随着反顶力的增大而增大。 展开更多
关键词 精冲 模具 磨损 成型载荷
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基于Dynaform的汽车覆盖件冲压成形仿真研究与应用 被引量:7
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作者 刘世豪 王东方 唐绍华 《电加工与模具》 2008年第B04期45-49,共5页
介绍了汽车覆盖件冲压成形仿真的研究背景,阐明了拼焊板的应用现状,论述了拼焊板冲压成形数值模拟的理论和流程。在Dynaform中对拼焊板进行了冲压成形过程的仿真,通过对仿真结果进行分析,提出了减少成形缺陷的措施。
关键词 汽车覆盖件 拼焊板 冲压成形 仿真 DYNAform
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Forming process chain for manufacturing complex conical-section profiled rings:On a co-design method
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作者 Lei LIANG Chaojiang ZOU Lianggang GUO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第6期485-503,共19页
The final quality of complex conical-section rings depends on co-design of multiple processes in forming process chain.In this study,for a complex aeroengine casing ring with a large slope and a flange on its end,a co... The final quality of complex conical-section rings depends on co-design of multiple processes in forming process chain.In this study,for a complex aeroengine casing ring with a large slope and a flange on its end,a co-design method of the forming process chain is put forward towards the objective of precision forming,which not only proposes a standard process route composed of multiple processes of upsetting,punching,rectangular ring rolling,loose tooling forging and profiled ring rolling,but also presents co-design methods of dies and blanks for all the processes.For profiled ring rolling,a design method of preformed blank that makes the blank and the target conical-section ring have the same axial volume distribution is proposed.By the method,the axial metal redistribution during the process can be alleviated greatly thus improving the forming stability and precision of the ring.Based on the geometric features of designed preformed blank,design methods of blanks and dies for loose tolling forging,rectangular ring rolling,punching and upsetting are proposed sequentially.In view of the key roles of loose tooling forging(manufacturing the preformed blank)and profiled ring rolling on the final quality of the conical ring parts,inherited FE simulations for these two processes are performed to verify the proposed design methods and determine appropriate design parameter.It is demonstrated that the proposed design method has significant advantages in improving forming precision.Besides,a suggestive value 1.5 of the rolling ratio for profiled ring rolling(a key design parameter)is given based on comprehensive consideration of multiple indicators such as ring roundness,deformation uniformity and forming load.The corresponding industrial experiments performed illustrate that a high forming precision of the conical-section aeroengine casing ring is achieved. 展开更多
关键词 Complex conical-section ring Co-design of forming process chain Profiled ringrolling Preformed blank Loose tooling forging
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基于FLD成形极限理论的盒型冲压件质量控制的研究
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作者 刘雅聪 《承德石油高等专科学校学报》 CAS 2024年第3期14-17,23,共5页
为研究复杂盒形件成型质量的控制,使用USIBOR1500高强钢,通过SIS系统建立了盒形件有限元模型,对冲压过程进行了仿真模拟,通过在压料板上添加拉延筋结构对比成形结果,分析拉延筋对盒形件冲压成形的影响。仿真结果表明,通过增加拉延筋可... 为研究复杂盒形件成型质量的控制,使用USIBOR1500高强钢,通过SIS系统建立了盒形件有限元模型,对冲压过程进行了仿真模拟,通过在压料板上添加拉延筋结构对比成形结果,分析拉延筋对盒形件冲压成形的影响。仿真结果表明,通过增加拉延筋可以改变材料流动,减少拉延过程中材料起皱的程度。同时,提取了冲压成形过程中的行程曲线,确定拉延过程所需成形力和压边力大小,为模具设计提供依据,也可为其他同类冲压制件的成形提供参考。 展开更多
关键词 冲压成形 盒形件 拉延筋 成形力 压边力
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铝合金壳体精密成形回弹控制工艺优化
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作者 梁家生 《精密成形工程》 北大核心 2024年第2期104-107,共4页
目的精确控制铝合金壳体成形回弹角度,对铝合金壳体成形工艺进行优化。方法针对影响回弹角度的多个成形工艺参数(保温成形温度、模具间隙、摩擦因数和压边力)进行单变量逐步优化研究。结果随着保温成形温度的升高,壳体回弹角度因流变应... 目的精确控制铝合金壳体成形回弹角度,对铝合金壳体成形工艺进行优化。方法针对影响回弹角度的多个成形工艺参数(保温成形温度、模具间隙、摩擦因数和压边力)进行单变量逐步优化研究。结果随着保温成形温度的升高,壳体回弹角度因流变应力的降低和校正力的升高而逐渐降低;随着模具间隙的增大,可变动模具的圆角半径增大,板材贴合模具程度降低,壳体回弹角度逐渐增大;随着摩擦因数的增大,板材加工的形状与模具更契合,成形后回弹的角度降低;随着压边力的增大,板材内/外表面间的应力差大大降低,回弹角度逐渐降低。结论通过多个参数的逐步优化,获得最终优化工艺参数如下:保温成形温度为310℃,摩擦因数为0.15,模具间隙为1.1 mm,压边力为12 kN,对应的回弹角度为7.027°。 展开更多
关键词 铝合金 回弹角度 保温成形温度 模具间隙 摩擦因数 压边力
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多弯弹片级进模设计
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作者 宁涛 黄燕林 《模具工业》 2024年第11期25-28,共4页
通过对弹片的成形工艺进行分析,设计了级进模,模具整合冲废料、弯曲、角度调整等多道工序,并对模具的关键部位和难点进行了特殊设计,以提高成形效率和零件尺寸的稳定性。经实际生产验证:模具成形零件的方式稳定可靠,可为类似零件的模具... 通过对弹片的成形工艺进行分析,设计了级进模,模具整合冲废料、弯曲、角度调整等多道工序,并对模具的关键部位和难点进行了特殊设计,以提高成形效率和零件尺寸的稳定性。经实际生产验证:模具成形零件的方式稳定可靠,可为类似零件的模具设计提供参考。 展开更多
关键词 成形工艺 排样 级进模 导向精度
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基于DYNAFORM叶轮前盖板拉伸成形的数值模拟研究
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作者 袁昕 孔繁余 +1 位作者 沈小凯 陈凯 《中国农村水利水电》 北大核心 2015年第10期133-135,140,共4页
基于板料成形有限元分析软件DYNAFORM,对不同厚度的叶轮前盖板拉伸成形进行数值模拟,分析板料在不同厚度下的应力、厚度、压边力变化情况。结果表明:板料的相对厚度t/D越大,危险区域所受的应力越小,对拉伸有利;在板料拉伸过程中,压边力... 基于板料成形有限元分析软件DYNAFORM,对不同厚度的叶轮前盖板拉伸成形进行数值模拟,分析板料在不同厚度下的应力、厚度、压边力变化情况。结果表明:板料的相对厚度t/D越大,危险区域所受的应力越小,对拉伸有利;在板料拉伸过程中,压边力的平衡状态不随板料厚度变化而变化,基本保持一稳定的值。叶轮前盖板拉伸成形研究对冲压泵制造具有一定的指导意义。 展开更多
关键词 DYNAform 数值模拟 叶轮前盖板拉伸 成形厚度 应力变化 厚度变化 压边力变化
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新能源汽车后雾灯散热器机械加工工艺设计
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作者 孟玉喜 王玉忠 +1 位作者 张建雷 陈杰 《模具制造》 2024年第5期14-17,共4页
以某款新能源汽车中的后雾灯为机械加工研究对象,通过对后雾灯散热器零件的原材料、尺寸几何精度、表面质量和使用功能要求等进行逐一分析,牢牢抓住产品零件上76根散热小圆柱的成形作为设计的重点,经过多种可行加工方案的优化比较,选择... 以某款新能源汽车中的后雾灯为机械加工研究对象,通过对后雾灯散热器零件的原材料、尺寸几何精度、表面质量和使用功能要求等进行逐一分析,牢牢抓住产品零件上76根散热小圆柱的成形作为设计的重点,经过多种可行加工方案的优化比较,选择了从冷挤压模具成形→冲裁模具冲压加工→数控铣削加工的主要加工工艺路径,并对实际生产过程中出现的质量缺陷进行分析并加以解决。实际生产证明,该后雾灯散热器的机械加工工艺设计合理可行,所生产的产品符合图纸技术要求,能够满足大批量生产的需求。 展开更多
关键词 后雾灯散热器 76根小圆柱 冷挤压成形 冲裁模具 铣削加工
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Teflon-pad shaping process of circular metal blanks into quasi-cup specimens by theoretical and experimental methods 被引量:1
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作者 Abbas NIKNEJAD Iman KARAMI FATH 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第1期213-227,共15页
Teflon-pad shaping process of circular metal blanks into quasi-cup specimens is investigated by theoretical and experimental methods in the quasi-static condition. In the experiments, circular metal sheets are formed ... Teflon-pad shaping process of circular metal blanks into quasi-cup specimens is investigated by theoretical and experimental methods in the quasi-static condition. In the experiments, circular metal sheets are formed into the quasi-cup samples by compressing them between a Teflon-filled die and a rigid punch with desirable shape. To investigate influences of different parameters on the forming progress, 12 rigid punches with different dimensions, two blank material types of aluminum and galvanized iron, three blank thicknesses of 0.6, 1.1 and 1.5 mm, and two Teflon-fillers of PVC and polyurethane are used in several experimental tests. In the analytical part, theoretical deformation models of metal blank and Teflon-filler are introduced and based on energy method, energy absorptions by the blank and Teflon-filler are calculated to derive a theoretical formula for predicting total required energy of the forming process. For this purpose, several energy absorption mechanisms are considered in the blank and filler. Furthermore, predictions by theoretical equation are compared with the corresponding experimental tests to study the verity of the calculated formulas. Theoretical and experimental results illustrate change trend of forming energy with respect to blank thickness. Also, the performed forming tests show that when external cone angle of rigid punch with respect to the horizontal direction increases, forming energy increases nonlinearly; and when the depth of spherical part of rigid punch increases, the probability of rupture increases. Additionally, the experiments demonstrate that there is a direct relationship between the forming energy and flow stress of the blanks. Furthermore, experimental observations illustrate that forming energy of a certain blank with PVC Teflon-filler is higher than that of a similar specimen with polyurethane Teflon-filler; but, the probability of wrinkling decreases when PVC Teflon-pad is used as the filler; and it is advantage of PVC Teflon-filler with respect to polyurethane Teflon. 展开更多
关键词 Teflon-pad forming circular metal blank quasi-cup specimen PVC Teflon-filler polyurethane Teflon-filler forming energy
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