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轴对称拉深成形多点压边常压边力拉深模设计 总被引:8,自引:0,他引:8
对轴对称拉深成形 ,为提高压边效果 ,提出了在径向多个位置施加压边力的方法 ,且根据常力压边原理 ,用弹簧和橡胶作弹性元件 ,使在不同压边位置所产生的压边力 ,在拉深过程中保持定值。以此设计的模具所提供的压边力 ,更符合拉深工艺对压边力的要求。 相似文献
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以油箱盖板为研究对象,利用Dynaform有限元软件模拟了油箱盖板的拉深成形过程,分析了板料拉深成形过程中的起皱与拉裂等缺陷,选取模具间隙、冲压速度以及压边力3种工艺参数进行正交试验及参数优化,通过正交试验的极差分析得出影响油箱盖板最大减薄率的主次顺序为:模具间隙、压边力、冲压速度.此外由方差分析可知模具间隙及压边力对最大减薄率的影响显著.模拟结果表明,油箱盖板拉深成形的最优工艺方案为:模具间隙1.5t,冲压速度3000 mm·s-1以及压边力60 kN,其零件的最大减薄率及最大增厚率分别为13.23%与11.12%.采用拉深模具对优化后的工艺方案进行实验验证,零件的最大减薄率及最大增厚率分别为14.87%与12.64%,模拟结果与实验结果比较吻合,且油箱盖板的成形质量较好. 相似文献
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起皱和拉裂是印涂铝盖在冲压拉深过程中的两大主要缺陷,合适的压边力对防止起皱和拉裂具有十分重要的作用。实际中,通常采用理论计算和模具调试的方法来获得合适的压边力数值,但理论计算方法计算复杂、可操作性差,而模具调试繁琐且费时费工。针对这一问题,以非线性有限元分析软件Dynaform为平台,对印涂铝盖冲压拉深工艺过程和压边力进行数值模拟和理论分析,确定了压边力的合理范围,并根据压边力范围试冲产品以确定最佳压边力。结果表明,1716印涂铝盖首次拉深的压边力数值的合理范围为7~8.8 k N,最理想的压边力数值在8.8 k N附近。该方法减少了压边力调试的盲目性,缩短了模具调试时间,减少了模具调试难度,最终达到降低产品制造成本的目的。 相似文献
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通过在拉深模具结构中,采用氮气弹簧用作拉深模具的弹顶部件,来替代传统模具中的橡胶或金属弹簧压边零件,较好地解决了拉深成形中的拉裂或起皱缺陷。由于氮气弹簧具有恒定而平稳的弹力特性,使压边力始终保持在一个稳定的数值范围内,因此保证了被加工材料顺利地进入凹模型腔,生产出的磁轭零件不破裂、圆周表面光滑。此项技术的应用,极大地改善了材料的拉深性能,使价格低廉的热轧酸性钢板应用于拉深材料行列,从而降低了生产成本。 相似文献
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对盒形件拉深成形,提出了在周边多个位置施加压力的方法,且根据常力边原理,用弹簧和橡胶作弹性元件,可根据需要在不同位置施加不同的压边力,且每个位置的压边力在拉深过程中保持定值,以此设计的模具所提供的压边力,更适合复杂零件的成形,也更符合拉深工艺对压边力的要求。 相似文献
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通过研究锥形拉深件的变形特征,确定了锥形件在拉深过程中的起皱部位,并通过模拟结构和试模结果验证了这一结论的科学性;利用Dynaform软件对锥形拉深件的无压边、平面压边和锥形压边的拉深过程进行数值模拟,分析了三种情况下的拉深状态,从而确定了合理的拉深成形方案;通过对模具结构的改进,解决了侧壁起皱问题,可生产出合格产品。此方法为锥形拉深件的成形工艺提供了实际参考价值。 相似文献
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L.M. Smith Y.J. Zhou D.J. Zhou C. Du C. Wanintrudal 《Journal of Materials Processing Technology》2009,209(10):4942-4948
A novel device for obtaining pulling and holding forces for draw bead tooling on inclined binder surfaces has been developed. A mechanical design featuring two load cells, a male–female draw bead set, translation and rotation degrees of freedom, and a screw-driven clamping system has been incorporated into a standard tensile test machine. On a real time basis, pulling force, holding force, and draw-in displacement are downloaded directly into a PC for data processing. Results for the sheet metal materials considered confirm quantitatively that the binder angle significantly influences the draw bead pulling force. For example, for the materials, bead penetrations, and bead geometries studied, the pulling force at a 20° binder angle ranged from 55% to 96% of that corresponding to a 0° binder angle. The pulling force data are useful for the purpose of theoretical and numerical draw bead model calibration. The proposed experimental system, called the Oakland University Angle Draw Bead Simulation (OU-ADBS) test, represents a significant breakthrough in draw bead simulation technology due to its relatively low cost and clever design. 相似文献
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针对薄板件装夹及加工时易变形的问题,为研究夹紧力对7075铝合金薄板件铣削变形的影响,对铝合金薄板件进行铣削实验,采用面支撑、四点夹紧的装夹方式,通过改变初始夹紧力的值,对铣削后平面度进行测量。结果表明:在铣削过程中,夹紧力一直处于动态变化中,最大变化幅度为9%,且铣削结束时,夹紧力不会恢复到初始值,初始与结束时夹紧力的最大差值为42N;增大初始夹紧力,切削力也随之增大;铣削后表面的平面度随着初始夹紧力的增大呈现出先增大后减小再增大的趋势。这说明,初始夹紧力的大小对工件变形的影响显著;加工过程中夹紧力的不断变化是影响工件变形的重要原因。 相似文献
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《Science & Technology of Welding & Joining》2013,18(5):396-403
AbstractIn this paper, prediction and controlling angular distortion in fillet welded joint and structure were investigated. First, two methods to reduce angular distortion in fillet welded joint were investigated by experimental and numerical analysis. One was to apply a constant external force in-process and the other was rigid clamping. In numerical analysis, a new in-house finite element code has been developed based on the idea of iterative substructure method (ISM) to calculate welding distortion in rational time. During experimental analysis, the constant external force was designed and applied in-process to reduce angular distortion of fillet welded joint. The results showed that the distortion can be efficiently predicted by ISM, which were in good agreement with the experimental ones. Applying constant external force in process was a more effective method to reduce distortion than using rigid clamping. In addition, with a constant load distance from weld bead, the locations of the applied constant external force and rigid clamping along the longitudinal direction (welding direction) have little influence on the magnitude of welding angular distortion. Finally, the angular distortion of a large fillet welded structure was predicted with ISM and also controlled with applying a constant external force based on the simulation results of the fillet welded joint. 相似文献
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由于散热器叶片薄,叶片之间的间距小,环形的凹槽较深,用压铸工艺生产散热器,压铸模动模型芯若采用整体结构难以加工制造。压铸模的动模型芯采用镶块组合结构,不仅解决了型腔制造困难,而且改善了模具的填充、排气性能,使铸件组织致密,满足了散热器铸件对气密性的要求。在分析散热器压铸工艺性的基础上,论述了模具的设计要点,通过主胀型力和锁模力的计算,选择了压铸机,给出了工艺参数和实用的模具结构,进而论述了模具的工作原理和压铸工艺。 相似文献
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I. S. Song D. J. Yoo J. W. Yoon D. Y. Yang H. Huh J. H. Lee 《Journal of Materials Engineering and Performance》1995,4(5):593-598
The forming of automobile sheet metal parts in a draw die consists of clamping a blank by binders to form a binder wrap and
drawing the blank into the final part. This paper proposes a numerical method to calculate the binder wrap. A blank is composed
of two regions: the contact region with the die face and the noncontact region of the die cavity. In this study, surface boundary
condition is suggested for calculating the configuration of the binder wrap. Surface boundary condition means that the three-dimensional
geometric data of the die face are used as the base for the displacement boundary condition of the finite-element analysis.
To verify the validity of the proposed method, the binder wraps of complicated automobile parts, including a front fender
and a trunk lid, are analyzed. 相似文献
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田福祥 《特种铸造及有色合金》2006,26(5):290-292
抽拔交叉型芯机构设计是压铸模设计的难点之一。交叉复合弯销与液压抽拔交叉型芯压铸模结构,用于压铸带内侧凹的杯形零件。设在动模上成型杯形铸件内壁的型芯也是杯形的,即空心型芯,内装有成型铸件内侧凹的型芯和小弯销。小弯销与固定于定模的大弯销构成交叉复合弯销。空心型芯与固定在动模上的液压抽芯器相连。开模时,压铸机开模力驱动交叉复合弯销机构进行铸件内侧凹抽芯,然后液压抽芯器抽拔杯形型芯。 相似文献
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林王仲 《锻压装备与制造技术》2017,52(3)
本文介绍了一种哈夫模锁模力的设计计算。通过对制件的工艺分析,思考设计难点,重点介绍模具锁紧力设计过程。通过制件工艺分析,计算出最适合的锁紧力。 相似文献
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为了制作合格的上外罩零件,对其结构、成形工艺难点和工序内容进行了分析,确定了落料拉深、冲凸台、车边、冲孔、整形、压印等8道制作工序.结合冲压模具设计的知识和经验,设计了1副复合模和各单工序模,并对每1道制作工序和各模具工作过程进行了详细的阐述.为了保证车边工序的质量,设计了1副车边夹具,并对夹具的工作原理进行了详细说明... 相似文献