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作品数:9 被引量:134H指数:6
相关作者:詹梅杨合李恒张旭光谷瑞杰更多>>
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基于有限元模拟的数控弯管过程轴力和弯矩的分析计算被引量:5
2005年
获取管材数控弯曲过程中的轴力和弯矩,有助于对成形机理的了解和后续的回弹分析,以及为选择设备和设计模具提供重要依据。提出了基于三维有限元模拟的数控弯管过程中轴力和弯矩的求解方法,详细阐述了其实现过程。采用该方法,分析了轴力和弯矩随弯曲角的变化特征以及工艺和材料参数对轴力和弯矩的影响规律:随着弯曲过程的进行,塑性变形区的轴力变化不大,弯矩呈指数关系变化,而弯曲变形区刚性端的轴力几乎线性递增,弯矩类似于阻尼正弦曲线变化;弯曲速度和材料强度系数的增大以及弯曲半径和硬化指数的减小会引起轴力和弯矩的增加。文中提出的方法也可推广应用于板材、其他型材和管材的弯曲。
詹梅杨合江志强
关键词:数控弯管三维有限元轴力弯矩
3D FEM simulation of NC precision bending process of thin-walled tube
The NC precision bending process of thin-walled tube is one of advanced plastic forming processes with high ef...
Lin Yan
基于关系数据库的数控弯管成形有限元仿真管理系统研究与开发被引量:1
2010年
采用计算机建模仿真与理论及实验研究有机结合的方法,对复杂的数控弯管成形过程进行研究是一种可行和可靠的手段。数控弯管仿真及实验过程涉及大量数据、模型和结果,为对这些信息进行存储和管理,以及将研究中积累的宝贵知识进行共享和重用,从而提高数控弯管成形过程有限元仿真和实际生产的效率和精度,文章基于关系数据库技术,研究开发了数控弯管成形有限元仿真管理系统。结果表明,该系统不仅能指导研究工作者进行高效精确的数控弯管数值模拟研究,而且能全程指导实验研究及实际生产,并且能迅速有效地将专家建议提供给操作人员。
薛艳丽杨合吴成宝郭良刚詹梅
关键词:数控弯管关系数据库通用查询
薄壁管小弯曲半径数控弯曲壁厚减薄的实验研究
外侧壁厚减薄是弯管成形中容易出现的加工缺陷之一,对于薄壁管小弯曲半径(R/D(?)2)数控弯曲成形尤为严重。本文采用实验法,对该成形过程中弯曲段的壁厚减薄进行了深入研究,得到芯头个数、芯棒伸出量、弯曲角度、压块与管件摩擦...
岳永保杨合詹梅寇永乐李恒
关键词:薄壁管小弯曲半径数控弯曲
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A Study on 3D FE Simulation Method of NC Bending Process of Thin-walled Tube
<正> The numerical control (NC) precision bending process of thin-walled tube is one of advanced plastic formin...
ZHAN Mei, YANG He, JIANG Zhi-qiang, ZHAO Zhen-song, LIN Yan(1. College of Materials Science and Engineering, Northwestern Polytechnical University,Xi’an 710072, China
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薄壁管数控弯曲成形过程管材/模具间隙的作用机理
管材与不同部位模具间隙是影响薄壁管数控弯曲过程成形极限和成形质量的重要因素。本文在对该成形过程变形特点进行描述的基础上,利用动态显式有限元软件ABAQUS/Explicit,建立了该复杂成形过程的三维弹塑性有限元模型,从...
李恒杨合詹梅谷瑞杰
关键词:数控弯曲失稳起皱壁厚变化
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Explicit FE wrinkling simulation and method to catch critical bifurcation point in tube bending process
2006年
The wrinkling has become the main defect in the thin-walled tube NC bending process. In the study, a dynamic explicit FE model for aluminum alloy thin-walled tube NC bending process is developed to predict the wrinkling by using FE code ABAQUS/Explicit. Attention was paid to the influences of mass scaling, loading rate scaling, mesh density and element type on accurate wrinkling prediction. So the wrinkling modes and mechanism are revealed based on the reliable FE model. Then a two step strategy is proposed to capture the critical bifurcation point for the optimal design process. The results show: 1) The boundary conditions determine the tube materials response greatly so that the frequency analysis is meaningless to the simulation. It is the contact conditions that make the effect of the mass scaling and loading rate less significant.2) There are two wrinkling modes in the tube bending process. One refers to that local ripples occur initially in the straight regions contacted with wiper die and mandrel; the other refers to that local wrinkles occur in the curved regions due to the relative slipping between tube and clamp die. 3) Both the difference of the in-plane compressive stresses and the relative slipping distance are chosen to be the quantitative indexes to represent the critical point and wrinkling tendency. The experiment of aluminum alloy (5052 O) tube bending was carried out to verify whether the above wrinkle modes exist and the indexes proposed are reasonable to catch the critical bifurcation point. The results may help better understanding of the wrinkling mechanism and the process optimization of the tube bending.
杨合李恒詹梅谷瑞杰
关键词:起皱现象弯曲现象
管材数控弯曲回弹规律的有限元分析被引量:27
2004年
回弹是管材弯曲卸载后必然发生的现象,并严重影响弯曲管件的精度和管材弯曲生产的效率.成形参数对管材弯曲卸载后的回弹有重要的影响.为了研究成形参数对回弹角的影响,基于弹塑性有限元软件ANSYS建立了管材数控弯曲及回弹的有限元模型,以不锈钢管弯曲及回弹过程为典型研究对象,实验验证了所建立的有限元模型的可靠性,并分析了部分工艺和材料性能参数对管材数控弯曲回弹的影响规律.结果表明:回弹角随弯曲角、芯棒与管壁间隙及材料硬化系数的增大而增大,随材料硬化指数的增大而减小.
詹梅杨合栗振斌
关键词:弯曲回弹管材弯曲不锈钢管弹塑性有限元有限元模型
Effects of process parameters on numerical control bending process for large diameter thin-walled aluminum alloy tubes被引量:16
2009年
Numerical control(NC) bending experiments with different process parameters were carried out for 5052O aluminum alloy tubes with outer diameter of 70 mm, wall thickness of 1.5 mm, and centerline bending radius of 105 mm. And the effects of process parameters on tube wall thinning and cross section distortion were investigated. Meanwhile, acceptable bending of the 5052O aluminum tubes was accomplished based on the above experiments. The results show that the effects of process parameters on bending process for large diameter thin-walled aluminum alloy tubes are similar to those for small diameter thin-walled tubes, but the forming quality of the large diameter thin-walled aluminum alloy tubes is much more sensitive to the process parameters and thus it is more difficult to form.
李成杨合詹梅许旭东李光俊
关键词:工艺参数铝合金管大直径数控数字控制
Forming Characteristics of Al-alloy Large-diameter Thin-walled Tubes in NC-bending Under Axial Compressive Loads被引量:7
2010年
Tube thinning control without wrinkling occurring is a key problem urgently to be solved for improving the forming qualities in numerical control (NC) bending processes of large-diameter Al-alloy thin-walled tubes (AATTs). It may be a way solving this problem to exert axial compression loads (ACL) on the tube end in the bending. Thus, this article establishes a three-dimensional (3D) elastic-plastic explicit finite element (FE) model for the bending under ACL and has its reliability verified. Through a multi-index orthogonal experiment design, a combination of process parameters, each expressed by a proper range, for this FE model is derived to overcome the compression instability on tube ends. By combining the FE model with a wrinkling energy prediction model, an in-depth study is conducted on the forming characteristics of large-diameter AATTs with small bending radii and it can be concluded that (1) The larger the tube diameters and the smaller the bending radii, the larger the induced tangent tension stress zones on tube intrados, by which the tube maximum tangent compression stress zones will be partitioned in the bending processes; thus, the smaller the ACL roles in decreasing thinning degrees and the larger the compression instability possibilities on tube ends. (2) The tube wrinkling possibilities under ACL are larger than without ACL acting in the earlier forming periods, and smaller in the later ones. (3) For the tubes with a size factor less than 80, the ACL roles in decreasing thinning degrees are stronger than in increasing wrinkling possibilities.
闫晶杨合詹梅李恒
关键词:BENDINGFORMING
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