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Study of residual stresses in tailor rolled blanked Al5J32-T4 sheets 被引量:10
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作者 KIM Dongok KIM Jinpyeong +3 位作者 LEE Yong KWAK Heeman RYU Yongmun HAN Beomsuck 《Rare Metals》 SCIE EI CAS CSCD 2006年第z2期111-117,共7页
Several automotive parts such as door panels have been manufactured by using load-adapted blanks for crash optimization and weight minimization. Recently, Tailor Rolled Blanks (TRB) has been introduced to remove the d... Several automotive parts such as door panels have been manufactured by using load-adapted blanks for crash optimization and weight minimization. Recently, Tailor Rolled Blanks (TRB) has been introduced to remove the disadvantages of a welding process which was used in joining panel components. TRB offers better structural design capabilities due to the seamless transitions on the panels with different thicknesses. In spite of the advantages of the process, TRB leaves internal stresses in the panel. This residual stresses lower the formability of Tailor Rolled Blanked (TRBed) parts and cause cracks near severe curvature during subsequent forming processes. In this research, the residual stresses of TRBed Al5J32-T4 sheets were studied by X-ray stress analysis, and also microstructure was observed along the rolling direction. In addition, heat treatment was done after TRB process in order to compare the residual stresses to that of the TRBed sheets before the heat treatment. 展开更多
关键词 tailor rolled blanks residual stresses deformation microstructure
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TRB及其轧制应用关键技术 被引量:21
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作者 杜继涛 甘屹 +1 位作者 齐从谦 任灏宇 《汽车技术》 北大核心 2007年第7期45-48,共4页
讨论了车身用连续变截面辊轧板(TRB)在轧制和应用过程中的关键技术。TRB技术的实质是传统纵轧与辊间距实时调整变化相协调的过程,TRB轧制的关键是建立板厚综合系统控制模型,TRB在车身上的应用需要解决相应的冲压模具设计及冲压成型性评... 讨论了车身用连续变截面辊轧板(TRB)在轧制和应用过程中的关键技术。TRB技术的实质是传统纵轧与辊间距实时调整变化相协调的过程,TRB轧制的关键是建立板厚综合系统控制模型,TRB在车身上的应用需要解决相应的冲压模具设计及冲压成型性评价等技术。该研究为实现车身轻量化拓宽了思路。 展开更多
关键词 车身 连续变截面辊轧板 轧制模型 板厚控制
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影响TRB单向拉伸的几何参数研究 被引量:9
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作者 李艳华 杜继涛 费宏斌 《现代制造工程》 CSCD 北大核心 2010年第3期83-85,107,共4页
将连续变截面辊轧板(Tailor Rolled Blanks,TRB)厚度过渡区离散为有限数量的等厚度区域,采用线性插值的方法描述TRB材料的非均匀性,建立TRB材料的应力应变场。参照等厚度板的单向拉伸试验国家标准,提出TRB单向拉伸试验的概念,在有限元软... 将连续变截面辊轧板(Tailor Rolled Blanks,TRB)厚度过渡区离散为有限数量的等厚度区域,采用线性插值的方法描述TRB材料的非均匀性,建立TRB材料的应力应变场。参照等厚度板的单向拉伸试验国家标准,提出TRB单向拉伸试验的概念,在有限元软件ABAQUS中建立TRB单向拉伸的数学模型。以影响TRB单向拉伸的板料过渡区长度、板料厚度比等为参数,以厚度过渡区伸长率和厚度过渡区移动量等为评价标准,通过数值模拟和回归分析对不同方案下的厚度过渡区伸长率和厚度过渡区移动量进行比较。最后得到板厚比和伸长率之间关系的三次拟合曲线,分析厚度过渡区长度、板厚比对厚度过渡区移动量的影响。其结果为TRB拉伸性能标准的制定以及推动TRB在车身轻量化上的应用提供了重要的技术参考。 展开更多
关键词 连续变截面辊轧板 有限元建模 单向拉伸
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TRB轧制集成建模及成型关键技术 被引量:5
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作者 杜继涛 齐从谦 甘屹 《汽车技术》 北大核心 2008年第9期56-59,共4页
给出了实现连续变截面辊轧板(TRB)厚度控制的框架模型,研究了TRB轧制液压伺服系统建模控制方法,并进行了仿真分析。为进一步提高板厚形状控制精度,提出了将数学模型、人工智能和虚拟制造集成起来建模的策略,并给出了相应厚度集成控制模... 给出了实现连续变截面辊轧板(TRB)厚度控制的框架模型,研究了TRB轧制液压伺服系统建模控制方法,并进行了仿真分析。为进一步提高板厚形状控制精度,提出了将数学模型、人工智能和虚拟制造集成起来建模的策略,并给出了相应厚度集成控制模型。分析了基于虚拟技术的覆盖件产品开发平台和反映TRB制造过程的多层次信息模型,为TRB轧制控制提供了一种有效方法。 展开更多
关键词 连续变截面辊轧板 轧制模型 虚拟制造
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利用ABAQUS与正交试验理论的TRB成形参数优化 被引量:6
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作者 李艳华 杜继涛 费宏斌 《现代制造工程》 CSCD 北大核心 2009年第11期136-138,共3页
在有限元软件ABAQUS中建立连续变截面板的数值模型,以影响变截面板矩形件成形的板料过渡区长度、板料过渡区位置和板料厚度比等为参数,以最大料厚减薄率和板料节约率等为考核目标,通过数值模拟和正交优化方法,对比分析不同方案下最大料... 在有限元软件ABAQUS中建立连续变截面板的数值模型,以影响变截面板矩形件成形的板料过渡区长度、板料过渡区位置和板料厚度比等为参数,以最大料厚减薄率和板料节约率等为考核目标,通过数值模拟和正交优化方法,对比分析不同方案下最大料厚减薄率和板料节约率,确定最优方案,以提高变截面板的成形性能。结果表明,厚度过渡区的长度对矩形件成形的影响最大,过渡区的位置次之,厚度比的影响最小。 展开更多
关键词 轻量化 连续变化的轧辊薄板 ABAQUS有限元建模 正交试验
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高强钢TRB高温下热流变特性 被引量:1
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作者 雷呈喜 邢忠文 +3 位作者 徐伟力 吴严俊 李云 单德彬 《材料科学与工艺》 EI CAS CSCD 北大核心 2015年第3期66-70,共5页
为了准确仿真高强钢板热冲压成形过程,获得高强钢高温下的材料本构关系模型,利用Gleeble3500热模拟试验机在不同温度和应变速率下对不同厚度的高强钢B1500HS钢板进行了单向拉伸试验,获得各种工艺条件下的应力-应变曲线,并基于变形抗力... 为了准确仿真高强钢板热冲压成形过程,获得高强钢高温下的材料本构关系模型,利用Gleeble3500热模拟试验机在不同温度和应变速率下对不同厚度的高强钢B1500HS钢板进行了单向拉伸试验,获得各种工艺条件下的应力-应变曲线,并基于变形抗力数学模型,引入板材厚度参数,通过最小二乘法进行数据拟合获得高强钢TRB高温下的材料本构关系.利用试验结果对本构关系模型进行的拟合验证表明,拟合程度较好,说明建立的材料本构关系能很好地描述高强钢TRB在高温下的应力-应变关系. 展开更多
关键词 高强钢 trb 高温 流变特性 应力-应变曲线
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CR340 TRB的晶体塑性有限元模拟及参数标定 被引量:3
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作者 付秀娟 赵严 +1 位作者 杨帅 于歌 《热加工工艺》 北大核心 2019年第23期93-96,共4页
基于Voronoi图形方法生成了随机晶粒形状的二维多晶体几何模型。同时将轧制差厚板的晶体塑性本构模型通过用户子程序嵌入到分析软件Abaqus中,进行单向拉伸模拟。结合晶体塑性理论和有限元数值模拟,采用控制变量法研究了参考剪切应变率... 基于Voronoi图形方法生成了随机晶粒形状的二维多晶体几何模型。同时将轧制差厚板的晶体塑性本构模型通过用户子程序嵌入到分析软件Abaqus中,进行单向拉伸模拟。结合晶体塑性理论和有限元数值模拟,采用控制变量法研究了参考剪切应变率、应变率敏感指数、初始硬化模量、饱和流动应力、初始临界分剪切应力对模拟结果的影响,通过拉伸试验和模拟得到应力应变曲线,确定了轧制差厚板晶体本构方程的各项参数。 展开更多
关键词 VORONOI图 轧制差厚板 晶体塑性理论 材料参数
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TRB板轧制-弯曲-回弹的多工步分析 被引量:3
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作者 张渝 谭键 《塑性工程学报》 CAS CSCD 北大核心 2016年第3期72-76,共5页
轧制差厚板的变厚度轧制过程中,由于厚区和薄区的变形程度不同,使得厚区和薄区的残余应力分布不均匀,对后续弯曲成形制件的回弹产生较大影响。将轧制和成形的有限元分析相结合,研究轧制差厚板的弯曲制件的残余应力对回弹的影响。推导了... 轧制差厚板的变厚度轧制过程中,由于厚区和薄区的变形程度不同,使得厚区和薄区的残余应力分布不均匀,对后续弯曲成形制件的回弹产生较大影响。将轧制和成形的有限元分析相结合,研究轧制差厚板的弯曲制件的残余应力对回弹的影响。推导了变厚度轧制过程中轧辊竖直方向运动的速度公式,用于实现变厚度轧制的有限元分析。把轧制差厚板的弯曲成形作为多工步塑性成形的后续工序,将轧制引起的残余应力继承到弯曲回弹的分析中,分析了轧制对回弹的影响。所得结果与物理试验进行对比,验证了该方法的有效性。 展开更多
关键词 轧制差厚板 变厚度轧制 弯曲 回弹
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TRB结构的某车型仪表板横梁轻量化设计 被引量:4
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作者 丁华 王烨 《重庆理工大学学报(自然科学)》 CAS 北大核心 2018年第1期7-13,共7页
为了实现某车型的仪表板横梁轻量化设计,利用CAE和连续变截面板(TRB)结构的特点对目标横梁进行优化设计。首先在有限元软件ANSYS中通过APDL的参数迭代,在满足仪表板横梁刚度的前提下将厚度截面的横梁管优化为连续变截面管。其次通过各... 为了实现某车型的仪表板横梁轻量化设计,利用CAE和连续变截面板(TRB)结构的特点对目标横梁进行优化设计。首先在有限元软件ANSYS中通过APDL的参数迭代,在满足仪表板横梁刚度的前提下将厚度截面的横梁管优化为连续变截面管。其次通过各支架部件的模态因子来定量分析各部件减重对仪表板横梁模态的影响,以明确支架零件的减重方向。最终仪表板横梁整体减少质量9.65%。 展开更多
关键词 仪表板横梁 连续变截面薄板 轻量化设计
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基于TRB结构的汽车前纵梁轻量化设计 被引量:2
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作者 马军伟 张渝 丁波 《汽车零部件》 2015年第3期21-23,共3页
以某汽车的前纵梁为例,参照我国C-NCAP中车辆正面碰撞测试要求,建立汽车前纵梁碰撞简化模型作为有限元仿真模型,并通过正交试验采样和多项式回归法构建响应面近似模型,将连续变截面板技术应用于前纵梁轻量化设计。结果表明:基于连续变... 以某汽车的前纵梁为例,参照我国C-NCAP中车辆正面碰撞测试要求,建立汽车前纵梁碰撞简化模型作为有限元仿真模型,并通过正交试验采样和多项式回归法构建响应面近似模型,将连续变截面板技术应用于前纵梁轻量化设计。结果表明:基于连续变截面板结构的汽车前纵梁相对于等厚板前纵梁具有更好的耐撞性,并且具有明显的减重效果,前纵梁质量减少了3.85kg,减重17.7%。 展开更多
关键词 汽车前纵梁 有限元仿真 连续变截面板 耐撞性 轻量化
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基于TRB技术的车身减量化设计与优化分析 被引量:5
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作者 程江洪 王丽娟 +2 位作者 陈宗渝 徐鸣涛 方柘林 《机械强度》 CAS CSCD 北大核心 2017年第1期57-62,共6页
连续变截面薄板(Tailor Rolled Blank,TRB)是新型的厚度连续变化的板材,它是实现轻量化的有效途径之一。基于TRB技术,结合车身碰撞力的传递路径及载荷流的合理分布的设计方法,以某款SUV车侧面碰撞中的主要关重件为例,对其结构进行优化... 连续变截面薄板(Tailor Rolled Blank,TRB)是新型的厚度连续变化的板材,它是实现轻量化的有效途径之一。基于TRB技术,结合车身碰撞力的传递路径及载荷流的合理分布的设计方法,以某款SUV车侧面碰撞中的主要关重件为例,对其结构进行优化设计。研究表明:应用新型TRB板材,在侧面碰撞过程中降低了整车的变形和胸部以及骨盆处侵入速度峰值,保证在耐撞性不减的前提下,整车质量减轻了5.5 kg,零件数量减少了5个。相应地也减少焊接工艺、生产工序,同时实现耐撞性和减量化的双重目标。 展开更多
关键词 trb板材 碰撞力 载荷流 关重件 优化设计 减量化
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Study on Nonuniform Deformation of Tailor Rolled Blank During Uniaxial Tension 被引量:14
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作者 Hua-Wei Zhang Xiang-Hua Liu +2 位作者 Li-Zhong Liu Ping Hu Jia-Lu Wu 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第9期1198-1204,共7页
The deformation characteristics of tailor rolled blank (TRB) in the course of uniaxial tension were studied by means of analysis, test and simulation. The mechanical analytical model of TRB during uniaxial tension w... The deformation characteristics of tailor rolled blank (TRB) in the course of uniaxial tension were studied by means of analysis, test and simulation. The mechanical analytical model of TRB during uniaxial tension was set up, and the deformation formulae for the thinner side and for the thicker side were derived to quantify the deformation of TRB. On this basis, uniaxial tension tests on TRB and ordinary blanks (the thinner side and the thicker side of TRB) were conducted. Lagrange polynomial interpolation method was adopted to construct the stress-strain fields of unannealed and annealed TRBs for solving TRB material parameters, and then, uniaxial tension simulation on TRB was completed. Deformations and properties of unannealed TRB were compared with those of annealed TRB, and the thinner side and the thicker side were also compared. Finally, the research results were explained by metallurgical structure. The results show that nonuniform deformation happens in TRB during uniaxial tension, and the necking occurs on the thinner side. The agreement of analysis, test and simulation confirms the correctness of the analytical model and the deformation formulae. The findings of this paper can lay the foundation for the future study on TRB stamping formability and provide a way for TRB modeling. 展开更多
关键词 tailor rolled blank (trb Nonuniform deformation Uniaxial tension ANNEALING Metallographical
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Forming Limit and Thickness Transition Zone Movement for Tailor Rolled Blank during Drawing Process 被引量:8
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作者 Hua-wei ZHANG Xiang-hua LIU +2 位作者 Li-zhong LIU Ping HU Jia-lu WU 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第3期185-189,共5页
The process of automobile lightweight can be promoted by the application of tailor rolled blank(TRB)in the automobile industry.Therefore,research on the formability of TRB is of good practical significance and appli... The process of automobile lightweight can be promoted by the application of tailor rolled blank(TRB)in the automobile industry.Therefore,research on the formability of TRB is of good practical significance and application value because of the enormous potential of TRB in the aspect of automobile lightweight.Aiming at the present condition of lack of researches on the influence of characteristic parameters on TRB drawing process,the drawing formability of TRB was studied with a combination method of simulation and experiment by taking square box as the research object.Firstly,drawing simulation and experiment of TRB were carried out.Then,effects of thickness transition zone(TTZ)position and blank size on the drawing formability of TRB were analyzed.Forming limit and TTZ movement for TRB square box during the drawing process were respectively discussed,when transition zones of TRB were located at different positions and blanks were of different sizes.The results indicate that lubrication condition exerts greater influence on TRB forming limit in comparison with TTZ movement,and the smaller blank size and TTZ being located at the blank center or slightly offset to the thinner side are preferable for acquiring greater forming limit and smaller TTZ movement. 展开更多
关键词 tailor rolled blank square box forming limit thickness transition zone movement drawing formability
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Crack defect of tailor rolled blank in deep drawing process 被引量:5
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作者 Hua-wei Zhang Jia-lu Wu Xin-gang Wang 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2018年第12期1237-1243,共7页
The deformation process of tailor rolled blank (TRB)is different from that of a monolithic blank as a result of the variable thickness in the rolling direction,and thus,the mechanism of the crack phenomenon needs to b... The deformation process of tailor rolled blank (TRB)is different from that of a monolithic blank as a result of the variable thickness in the rolling direction,and thus,the mechanism of the crack phenomenon needs to be further studied.The crack defect of TRB square box was studied by numerical simulation and stamping experiment.The stress state of TRB square box was elaborated.On this basis,the forming characteristics of TRB square box were summarized.The effects of blank size and blank holder force (BHF)on the thickness thinning of TRB were discussed.Finally,the mechanism.of the crack defect for TRB square box was revealed.Results indicate that non-uniformity is the most prominent characteristic during forming of TRB square box.The larger the blank size and BHF on the thinner side are,the more inclined TRB is to crack. Excessive BHF or insufficient BHF on the thicker side can also lead to the occurrence of the crack defect.BHF on the thinner side slightly greater than that on the thicker side (40 kN on the thinner side and 20 kN on the thicker side)is advantageous to restrict the excessive thickness thinning of TRB and acquire a better formability.The location inclined to crack for TRB square box is the round comer of the wall on the thinner side. 展开更多
关键词 tailor rolled blank Square box CRACK blank size blank HOLDER force
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Transverse Bending Characteristics in U-channel Forming of Tailor Rolled Blank 被引量:4
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作者 Hua-wei ZHANG Ying-ping GUAN +1 位作者 Jia-lu WU Xiang-hua LIU 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2016年第12期1249-1254,共6页
Research on the formability of tailor rolled blank (TRB) is of good practical significance and application value because of the enormous potential of TRB in the aspect of automobile lightweight. However, the forming... Research on the formability of tailor rolled blank (TRB) is of good practical significance and application value because of the enormous potential of TRB in the aspect of automobile lightweight. However, the forming of TRB is problematic because of the varying properties; especially, springback is a main challenge. The transverse bending (bending axis is perpendicular to the rolling direction) of TRB U channel was studied through simulation and experiment. The forming characteristics of TRB U channel during transverse bending were analyzed. The mechanisms of forming defects, including bending springback and thickness transition zone (TTZ) movement, were revealed. On this basis, effects of blank geometric parameters on springbaek and TTZ movement were discussed. The results indicate that springback and TTZ movement happen during transverse bending of TRB U-channel. Nonuni form stress distribution is the most fundamental reason for the occurrence of springback of TRB during transverse bending. Annealing can eliminate nonuniform stress distribution, and thus diminish springbaek of TRB, especially springback on the thinner side. Therefore, springback of the whole TRB becomes more uniform. However, annealing can increase the TTZ movement. Blank thickness and TTZ position are the main factors affecting the formability of TRB U-channel during transverse bending. 展开更多
关键词 tailor rolled blank transverse bending springback U-CHANNEL annealing thickness transition zone
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Springback characteristics in U-channel forming of tailor rolled blank 被引量:4
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作者 Huawei ZHANG Lizhong LIU +1 位作者 Ping HU Xianghua LIU 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2012年第3期207-213,共7页
Residual stress developed during the rolling process of tailor rolled blank (TRB) can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigate... Residual stress developed during the rolling process of tailor rolled blank (TRB) can affect the springback of finished parts considerably. Springback characteristics of unannealed and annealed TRBs were investigated by means of numerical simulation and experiments taking U-Channel as an example. TRBs were annealed by the annealing process (700 ℃, holding time 10 h), then stamping and springback processes of unannealed and annealed TRBs were simulated, and corresponding experiments were also carried out. Effects of the transition zone length, the blank thickness, the friction coefficient and the die clearance on the springback of TRB were analyzed. The results demonstrate that the springback of TRB annealed at 700 ~C for 10 h re- duces significantly. For unannealed and annealed U-Channels, the springback of TRB U-Channel is in direct proportion to the die clearance and is in inverse proportion to the transition zone length, the blank thickness and the friction coefficient. Spring- backs of the thinner monolithic (uniform thickness) blank, the thinner side of TRB, the thicker side of TRB and the thicker monolithic blank are sorted in descending order. 展开更多
关键词 tailor rolled blank SPRINGBACK ANNEALING
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Numerical Simulation and Experimental Investigation of Springback in U-Channel Forming of Tailor Rolled Blank 被引量:3
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作者 ZHANG Hua-wei 1 , LIU Li-zhong 1 , HU Ping 1 , LIU Xiang-hua 2 ( 1.Faculty of Vehicle Engineering and Mechanics , State Key Laboratory of Structural Analysis for Industrial Equipment , Dalian University of Technology , Dalian 116024 , Liaoning , China 2.Research Institute of Science and Technology , Northeastern University , Shenyang 110819 , Liaoning , China ) 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2012年第9期8-12,共5页
In order to grasp the springback rule of TRB ( tailor rolled blank ) parts after forming , the springback behavior of TRB was investigated by integrating such three means as theoretical research , numerical simulation... In order to grasp the springback rule of TRB ( tailor rolled blank ) parts after forming , the springback behavior of TRB was investigated by integrating such three means as theoretical research , numerical simulation and stamping experiments.Fundamental theories of springback were analyzed.The stamping and springback processes of annealed 1.2 / 2.0mm TRB , 1.2mm and 2.0mm plates for U-channel were simulated , and the simulation results were compared with the experiments.The results indicate that the springback of TRB falls in between those of the 1.2mm and 2.0mm plates.It is desirable for the TRB U-channel to have die clearance of 1.1times maximum blank thickness and friction coefficient of about 0.12 , and longer thickness transition zone is preferable.The simulation data demonstrate reasonably good agreement with the experiments. 展开更多
关键词 tailor rolled blank U-CHANNEL SPRINGBACK ANNEALING
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Velocity Preset and Transitional Zone′s Shape Optimization for Tailor Rolled Blank 被引量:3
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作者 Dong-cheng WANG Lian-chao DONG +1 位作者 Hong-min LIU Yan WANG 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2015年第4期279-287,共9页
Tailor rolled blank (TRB) is a type of emerging material to produce lightweight vehicle parts. Transitional zoners shape is an important parameter for tailor rolled blank. It not only affects mold design and the loc... Tailor rolled blank (TRB) is a type of emerging material to produce lightweight vehicle parts. Transitional zoners shape is an important parameter for tailor rolled blank. It not only affects mold design and the local carrying capacity of the stamping parts, but also determines the maximum value and variation characteristics of rolling force. How to get the best transitional zone's shape is a key problem for production of tailor rolled blank. A double power function is put forward using for transitional curve, which is continuous and smooth at all connection points inde- pendent of its parameters, so the sudden change of mechanical parameters during rolling and forming process can be avoided. At the same time, the velocity formula and restriction for arbitrary transitional curve are derived to preset vertical velocity of the roller and judge whether the curve can be rolled successfully or not. Then, the finite element method (FEM) is used to verify the precision of velocity formula and study the mechanical characteristics of different curves. Finally, a method to obtain the optimal curve equation is put forward and verified. 展开更多
关键词 tailor rolled blank transitional zone double power function velocity preset shape optimization
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使用TRB管无补料的液压胀形成形阶梯管的研究 被引量:4
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作者 张渝 顾栩 《热加工工艺》 CSCD 北大核心 2018年第23期168-172,共5页
建立了TRB(轧制差厚板)管无轴向补料阶梯管液压胀形的有限元模型,研究了TRB管的过渡区和胀形区长度及阶梯管的设计壁厚对终成形件壁厚分布的影响,并对某轴向非对称阶梯管的成形进行了模拟。结果表明:成形件最小壁厚与设计壁厚的最大差值... 建立了TRB(轧制差厚板)管无轴向补料阶梯管液压胀形的有限元模型,研究了TRB管的过渡区和胀形区长度及阶梯管的设计壁厚对终成形件壁厚分布的影响,并对某轴向非对称阶梯管的成形进行了模拟。结果表明:成形件最小壁厚与设计壁厚的最大差值为0.109 mm,为设计壁厚的5.45%,而最大壁厚与设计壁厚的最大差值为0.117 mm,为设计壁厚的5.85%;非轴向对称阶梯管成形中最小壁厚、最大壁厚与设计壁厚的差分别为设计壁厚的4%与4.88%,因此,壁厚分布是均匀的。随设计壁厚增大,壁厚差和最小壁厚与设计壁厚的差增大;过渡区长度增大,壁厚差增大,在过渡区长度小于30 mm时,最小壁厚与设计壁厚的差快速减小,之后变化不明显;胀形区的长度对两个壁厚差的影响规律相似,随账形区长度增大,均为先减后增且壁厚差值变化量不大。 展开更多
关键词 trb(轧制差厚板)管 阶梯管 液压胀形 均匀壁厚 非对称管
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Springback behavior of tailor rolled blank in U-shape forming 被引量:6
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作者 Ri-huan Lu Xiang-hua Liu +3 位作者 Shou-dong Chen Lu Feng Xian-lei Hu Li-zhong Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2017年第8期787-794,共8页
The springback of tailor rolled blanks with quenching and partitioning steels was investigated.In order to find out the springback behavior and related influence factors for the novel sheets,both experimental and simu... The springback of tailor rolled blanks with quenching and partitioning steels was investigated.In order to find out the springback behavior and related influence factors for the novel sheets,both experimental and simulation methods have been used to compare and analyze the springback characteristics of equal thickness blanks and tailor rolled blanks in U-channel forming.From the results,the overall springback angles of tailor rolled blanks at thin and thick sides are respectively 106.79° and 99.705°,which are both lower than those of the corresponding equal thickness blanks.Due to the existence of the thickness transition zone,the stress distribution in thin and thick sides of blanks is changed.The location of dangerous region in thin side of tailor rolled blanks is closer to the end of side,and the thick side moved to the middle of straight wall,which are different with the equal thickness blanks.Afterwards,the released quantitles of tangential stress and strain per unit section of blank are adopted to calculate relative springback angles and give novel evaluation criteria for qualitatively analyzing the amount of springback angles.By comparing the results,it shows that the tangential strain method is more suitable for the actual situation. 展开更多
关键词 tailor rolled blank Springback angle Elastic recovery Tangential stress Tangential strain
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