共查询到19条相似文献,搜索用时 93 毫秒
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目的 选用充液拉深先进成形技术制备钛/铁复合板平底球形薄壁件,并研究其充液拉深变形行为,以解决传统拉深工艺制备平底球形薄壁件极易产生褶皱的问题。方法 对钛/铁复合板平底球形薄壁件在不同液压力、压边间隙及凸模与板料间摩擦因数等工艺参数下的充液拉深过程进行数值模拟。对数值模拟结果进行分析,讨论工艺参数对零件成形性能的影响以及抑制起皱的机理。最后在不同拉深工艺下进行成形试验,制备钛/铁复合板平底球形薄壁件并与数值模拟结果进行对比。结果 数值模拟和成形试验结果表明,传统拉深工艺制备的钛/铁复合板平底球形薄壁件出现了明显的褶皱,采用充液拉深工艺可以有效解决零件侧壁起皱的问题。增大液压力、减小压边间隙或增大凸模与板料间摩擦因数会导致零件减薄率的提高并降低零件侧壁起皱的风险。在压边间隙1.5 mm、液压力25 MPa的条件下,采用充液拉深工艺可以制备出侧壁无褶皱的平底球形薄壁件。结论 通过充液拉深工艺可以有效解决钛/铁复合板平底球形薄壁件成形过程中起皱的问题。 相似文献
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目的探究液室压力和拉深速度以及温度场分布规律对成形性能的影响。方法在通用有限元软件MSC.Marc中建立5A06铝镁合金温热介质充液成形有限元模拟的专用平台,对典型零件温热介质充液成形进行有限元模拟。结果在液室压力为5 MPa、拉深速度为5 mm/s的情况下成形效果最好,最佳温度场分布为凹模与板料温度250℃、凸模温度20℃、压边圈温度300℃,在此条件下,凸模直径为100 mm时极限拉深深度可达到161.4 mm。结论液室压力和拉深速度以及温度场的分布对成形性能有着显著影响。 相似文献
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目的研究工艺参数对2A12铝合金平底筒形件充液拉深成形的影响规律。方法采用数值模拟方法,研究了液室压力加载路径、成形液室压力、压边力和压边间隙对板材充液拉深成形效果的影响。结果获得了充液拉深成形的失效形式,以及不同工艺参数下零件壁厚减薄率的变化规律。成形前期,液室压力不宜过大,最大液室压力在10~25 MPa之间,压边间隙在1.05~1.15mm之内,可有效避免零件过度减薄和法兰起皱。结论合理的液室压力加载路径和压边间隙,可以有效地控制零件法兰区起皱,防止凸模圆角处破裂。 相似文献
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The effect of different punches head profile on deep drawing of 5005 H34 Aluminium circular blanks to manufacture a cup-shape product were studied. Experiments were conducted by a 150 ton hydraulic press with using different punches geometry and lubricants viscosity. The drawing force, blank holder pressure, and movement of the punch were measured during experiments to monitor effects of various manufacturing parameters during the drawing process. The surface finish and dimensions of all cups were determined after drawing processes. The geometry of the punch influences the friction force between the blank and punch, and consequently the stretching bottom surface of the cup. The Flat punch geometry produced cups with better surface finish, higher drawing force, and thinner cup wall thickness in comparison to other punches geometry. The Bore punch geometry enhances the stretching of the bottom part of the cup. The presence of lubricant in the process improves the stretching of bottom part of a cup for all punches profile. 相似文献
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为完善车身冲模结构设计的理论体系,提出了制件在冲模设计坐标系中定位的概念,并应用六点定位原理对这一问题进行了研究,探讨了冲压方向的选择原则与工序件的设计方法,根据数字设计的特点对拉延模零件及其特征进行了分类,在此基础上提出了拉延模数字设计的工作策略与方法.结果表明:制件在冲模设计坐标系中的定位是通过设计基准点与冲压方向实现的;拉延模数字设计的工作策略与方法经工程实例验证是可行的. 相似文献
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AZ31薄板热拉深工艺研究 总被引:2,自引:0,他引:2
为提高AZ31薄板热拉深质量、确定热拉深过程的合理工艺参数,选取不同的成形温度、模具间隙及凸模圆角半径,拉深成形了AZ31试样,采用KH-2200MD金相显微镜观察其内部组织变化,并通过x-ray衍射实验分析晶面取向的变化.实验结果表明,0.8mm的AZ31B镁合金板料在240℃附近的成形性能最好,拉深后材料组织晶粒大小均匀,晶面取向分布均匀.热拉深AZ31B镁合金板料应将凸、凹模间隙选为1.1倍的板料厚度.在压边力不变的条件下,随着凸模圆角半径的减小,拉深高度降低加快,并且起皱现象加重. 相似文献
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Deep drawing is an important process used for producing cups from sheet metal in large quantities. The deep drawing process is affected by many variables such as blank shape, punch and die radii, material’s formability characteristics, and many more. In order to obtain optimal process parameters with regard to part geometry, the blank and die geometry are particularly important factors. In this study, we investigated the effects of blank holder and die shapes, using six different blank holder and die shapes. We measured the distribution of blank holder force (BHF), the forming load at different drawing depths as well as thickness reduction of cup wall thickness for each set of die and punch geometries. The experimental study shows that the angle of blank and die surface influence the forming load and blank holder force distribution. Deep drawing dies with matrix and blank holder angle designed in this study provided deep drawing ratios that are about 25 % larger than those that usually can be obtained by a conventional die. 相似文献
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目的解决2A16铝合金锥形件常温充液成形困难、表面质量差的问题。方法介绍了充液热成形工艺,并提出了3种锥形件成形方案,通过专用有限元软件Dynaform对所有方案进行了数值仿真;同时,对一步成形方案进行了试验。结果通过试验验证了有限元模型的正确性。由仿真分析可知,成形缺陷包括悬空区起皱和凹模圆角及底部破裂,一步成形方案不可取,两步成形方案均可以将减薄率控制在13%以下。起皱危险主要发生在零件法兰以下30~55 mm处。结论充液热成形与常温充液成形相比,可以显著提高材料的成形性;两步充液热成形方案可以获得2A16铝合金锥形件;预成形凸模的形状设计对零件的表面质量影响明显;最终确定用先热冲压筒形件,后充液热成形的工艺方案,来成形2A16铝合金锥形件。 相似文献
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Reza Bagheriasl Kamyar Ghavam Michael J. Worswick 《International Journal of Material Forming》2014,7(2):139-154
A combined experimental and numerical study of the effects of die and punch temperature on the formability of a modified AA3003 aluminum alloy sheet for a case study sample is presented. Here, the non-isothermal deep drawing of a cup-like feature in a thin gauge aluminum automotive component is considered. An experimental forming setup that incorporates both heated dies and a cooled punch has been developed. A parametric study of the effects of die temperature, punch temperature, and blank holder force on the formability of the part is conducted. Numerical simulations of the warm forming process are performed using a coupled thermo-mechanical finite element model. The temperature-dependant material model combines the Bergstrom hardening rule with Barlat’s YLD2000 yield function and was implemented in LS-DYNA as a user-defined material model. Selected experimental cases were modelled numerically and compared to experiments. The FEA model was validated against experimental results by comparing measured and predicted punch force versus displacement as well as trends in the formability as a function of die temperature. 相似文献