共查询到19条相似文献,搜索用时 907 毫秒
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闭式模锻液压模架液压缸的优化设计研究 总被引:1,自引:0,他引:1
精密成形技术不仅能节省原材料和能源,缩短生产周期,还能获得复杂形状的制件,提高产品质量和增强其市场竞争力。闭塞模锻是精密成形技术的一个重要分支,模架是这项技术的重要装备。液压模架又是闭塞模锻模架的发展趋势。本文在综合分析的基础上,研制出液压力合模的模架。在该模架液压缸缸体设计中引入第三强度理论和优化设计理论,为缸体结构参数的优化选取提供理论指导。利用该模架成功地锻出轿车等速万向节星形套冷精锻件。这项技术用于生产中,经济效益显著,应用前景广阔。 相似文献
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针对扭臂模锻成形过程,采用三维刚塑性有限元法进行了数值模拟,分析了金属的塑性变形行为,对可能产生的缺陷进行预测,给出了等效应力、等效应变的分布情况,从而为工艺制订和模具设计提供理论依据。 相似文献
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房车转向节轮廊尺寸大、结构极其复杂,目前采用的分体制造技术存在材料利用率和生产效率低、产品性能差的问题。为此,提出了转向节整体模锻成形的工艺方案,着重研究了其关键工序弯曲成形的工艺优化并进行了专用模具装置开发。采用经典塑性成形理论、有限元数值模拟和试验相结合的方法,分析了弯曲过程的应力应变状态、金属流动和损伤分布。工艺试验结果表明,所提出方案合理,实现了以整体模锻取代分体制造,材料利用率由约45%提高至70%以上,生产效率提高4~5倍。 相似文献
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赵一平 《机械工人(热加工)》2014,(5)
正按照金属体积模锻中最后成形工步的成形方法,可以把体积模锻分为镦粗、镦挤、挤压及顶镦四种。另外金属还有许多局部成形方法,如辊锻、楔横轧、扩辗、摆辗、径向锻造、旋压、弯曲及精压等。塑性成形按金属材料温度分类有冷锻、温锻、热锻。按应力状态,塑性成形主要包括三类成形工艺:①低压应力开式模锻工艺。低压应力模锻成形包括镦粗和开式模锻(镦挤成形)。②高压应力闭式模锻和 相似文献
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汽车前轴精密辊锻成形过程的数值模拟 总被引:13,自引:1,他引:12
汽车前轴的精辊-模锻工艺是一种用小成形力锻造设备成形较大型前轴锻件的塑性加工技术,其工艺关键在于精密辊锻。前轴的精密辊锻分4个道次,是典型的局部成形工艺。辊锻工艺由于旋转的模具与辊锻件之间的接触区域在不断变化,一直以来成为数值模拟的难点。对4个道次的模具建立了模型,采用三维刚塑性有限元程序DEFORM-3D模拟了前轴精密辊锻工艺,分析了辊锻过程中金属变形的规律,研究了模具参数对成形质量的影响以及辊锻力矩的变化规律。模拟结果对于改进辊锻工艺设计、提高模具设计水平具有指导作用。 相似文献
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一种模拟塑性成型过程的新方法—模拟块技术及其应用 总被引:2,自引:0,他引:2
提出一种模拟塑性成型过程的模拟块技术。用它进行齿轮锻件的模锻模拟时,把齿轮分成内外两部分,每一部分使用一个模拟块。两部分通过一个接口传递数据。每个模拟块在各自的型腔内自动进行形状和尺寸变化的模拟。不必关心模块的内部工作细节,只须注意表示其几何形状和尺寸变化的边界参量即可。详细介绍了基于UBET原理的轴对称矩形模拟块的建立、使用性能及其在正反向模拟中的用途与应用实例。 相似文献
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针对汽轮机叶片加工精度要求高、精锻模具误差补偿难度大以及加工效率低等问题,以某型号汽轮机叶片为例,利用DEFORM-3D数值模拟软件分别对叶片精锻模具Z=5 mm叶根截面、Z=35 mm叶身截面以及Z=75 mm叶尖截面在不同锻压步数下的弹性变形进行了模拟分析,得出精锻模具型腔曲面变形规律。基于数值模拟结果,提出利用反向迭代补偿与黄金分割相结合的方法来修正精锻模具型腔。以该汽轮机叶片最大允许误差80μm为迭代目标,采用黄金分割法调整迭代区间,对各迭代点进行仿真,确定最优修正系数为0.94,最后得到满足终锻叶片精度要求的合理模具型腔,大大提高了模具设计质量与效率。 相似文献
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A study on precision forging of spur gear forms and spline by the upper bound method 总被引:1,自引:0,他引:1
Precision forging is an important manufacturing procedure of spline and spur gear forms. It has advantages of improved strength, good tolerance, saving billet material, dispensing with the cutting, etc. In this paper, a mathematical model using an upper bound method is proposed for forging of spur gear forms and spline to investigate the plastic deformation behavior of billet within the die cavity. The material of solid billet was assumed as rigid–plastic and the shape of the tooth profile was accounted for the mathematical modeling of the kinematically admissible velocity field assumed for the plastic zone. The non-uniform velocity was employed for simulating the inhomogeneous deformation and the effect of barreling during the forging. Using the present model, various effects of forming parameter such as the friction factor, reduction, number of teeth, etc. upon the non-dimensional forging pressure, forging force and barreling of the spur gear forms and spline were analyzed systematically and the results compared with those of other researcher's analytical and experimental work. It is shown that the present modeling of the process improves knowledge of the process design performance for the precision forging of spur gear form and spline. 相似文献
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Aluminum alloy is a preferred metal material for lightweight part manufacturing in aerospace, automobile, and weapon industries due to its good physical properties, such as low density, high specific strength, and good corrosion resistance. However, during forging processes, underfilling, folding, broken streamline, crack, coarse grain, and other macro- or microdefects are easily generated because of the deformation characteristics of aluminum alloys, including narrow forgeable temperature region, fast heat dissipation to dies, strong adhesion, high strain rate sensitivity, and large flow resistance. Thus, it is seriously restricted for the forged part to obtain precision shape and enhanced property. In this paper, progresses in precision forging technologies of aluminum alloy parts were reviewed. Several advanced precision forging technologies have been developed, including closed die forging, isothermal die forging, local loading forging, metal flow forging with relief cavity, auxiliary force or vibration loading, casting-forging hybrid forming, and stamping-forging hybrid forming. High-precision aluminum alloy parts can be realized by controlling the forging processes and parameters or combining precision forging technologies with other forming technologies. The development of these technologies is beneficial to promote the application of aluminum alloys in manufacturing of lightweight parts. 相似文献
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上限元模拟技术在金属塑性加工优化设计中的应用 总被引:8,自引:0,他引:8
根据上限元理论提出了上限元模拟技术,阐述了采用该模拟技术依据金属塑性成型理论对金属塑性加工进行优化设计的模拟式设计方法,并以此建立了锻造工艺与锻模参数优化设计的CAS/CAD系统。模拟式设计方法可解决经验式设计必须多次试验和不能进行最优化设计的问题。实验室验证和生产的成功证明,以金属塑性成型理论和上限元模拟技术为基础的金属塑性加工优化设计的模拟式设计方法具有强大的吸引力和良好的应用前景。 相似文献