共查询到19条相似文献,搜索用时 109 毫秒
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薄壁筒形件多道次滚珠旋压成形机理研究 总被引:4,自引:0,他引:4
为研究多道次成形条件下薄壁筒形件滚珠旋压的成形机理,采用实验和有限元法相结合对薄壁筒形件多道次滚珠旋压的应力应变、旋压力和成形性进行了分析。结果表明:各道次下的等效应力和等效应变都是由旋压件的内表面向外表面逐渐增大,且随着旋压道次数的增加,等效应力和等效应变也都是逐渐增大;每道次的轴向旋压力随着滚珠行程的增加而增大,且各道次的旋压力也逐渐增大;多道次滚珠旋压时,由于采用较小的壁厚减薄量和材料的加工硬化,金属易于稳定流动,能够保证管坯的轴向伸长。因此,通过多道次滚珠旋压可实现大减薄量薄壁筒形件的旋压成形。 相似文献
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工艺参数对筒形件强力旋压过程的影响 总被引:11,自引:0,他引:11
在分析筒形件强力旋压的变形特点基础上建立了计算机仿真模型,利用计算机模拟技术系统地对筒形件强力旋压过程进行了模拟,主要研究变薄率、旋轮进给量、旋轮成形角、旋轮圆角半径四个关键的工艺秘压成形过程及工件质量的影响,通过依次变化每一个参数得到一系列的塑性力学的分布效果图及相应的曲线图,并对成形缺陷进行了预测,实现了相应的参数优化。 相似文献
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7055铝合金兼具钢的高强度与钛合金的低密度,同时具有良好的耐腐蚀性,且成本远低于钛合金,可推广并应用至固体火箭发动机的制造领域。通过分析毛坯性能、材料可旋性和温度对7055高强铝合金材料的力学性能的影响,制定了合理的工艺试验方案,以研究该材料旋压成形精度以及缺陷控制方法。通过开展7055高强铝合金多道次旋压试验,得到了旋压温度对成形缺陷的影响规律,以及旋轮成形角、进给比对工件成形精度的影响规律。最终确定了成形精度最佳的温度区间为90~110℃,旋轮圆角半径为6 mm,进给比为0.40~0.45,实现了7055高强铝合金筒形件壁厚由8.0 mm至1.6 mm的多道次、大减薄量的旋压成形,为该材料应用于固体火箭发动机壳体的旋压成形奠定基础。 相似文献
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筒形件强力旋压的刚塑性有限元分析 总被引:12,自引:0,他引:12
筒形件强力旋压是当代的一种重要生产工艺过程。本文建立了筒形件强力旋压的平面变形力学模型,通过刚塑性有限元分析,获得了正旋工艺和反旋工艺的塑性流动速度场,以及应变和应变速率的分布。塑性流动模型与网格实验结果在趋势上得到较好的吻合。 相似文献
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Process factors influencing spinning deformation of thin-walled tubular part with longitudinal inner ribs 总被引:3,自引:2,他引:3
As a successively and locally plastic deformation process, ball backward spinning is applied for the purpose of producing thin-walled tubular parts with longitudinal inner ribs. By simplifying ball backward spinning as forward extrusion mechanics model, slab method is used in order to solve spinning force. Based on plastic mechanics, the influence of the process parameters involved on formability of inner ribs as well as the quality defects of spun parts is analyzed so as to present an approach to acquire the desired parts. The quality of inner ribs is one of the critical tasks in obtaining the desired spun workpieces and the height of inner rib depends greatly on spinning material,ball diameter, feed ratio, and wall thickness of tubular blank. The knowledge of the influence of process variables such as ball diameter, feed ratio, and wall thickness of tubular blank on the spinning process is essential to prevent the quality defects of the spun parts and obtain the desired spun parts. 相似文献
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旋轮参数对铝合金分形旋压的影响规律 总被引:2,自引:2,他引:0
铝合金分形旋压是一个复杂的多因素耦合影响的塑性成形过程,研究其旋轮参数对成形过程的影响可为相关成形参数的确定和优化设计提供理论依据。基于建立的可靠的铝合金分形旋压三维有限元模型,文章研究揭示了旋轮分形角、旋轮圆角半径、旋轮轴向进给比等旋轮参数对成形过程中的切向拉应力、周向压应力以及成形凸缘的不均匀变形程度和最终壁厚偏差的影响规律。结果表明,增大旋轮分形角,可以消除旋轮前方的金属堆积和降低成形过程中坯料开裂失效的可能性,可以使得成形凸缘的不均匀变形程度减小和成形精度降低;旋轮圆角半径的改变,对消除旋轮前方的金属堆积和降低成形过程中坯料开裂失效的可能性影响并不明显,但增大旋轮圆角半径,可以使得成形凸缘的不均匀变形程度增大和成形精度升高;旋轮轴向进给比的改变,对消除旋轮前方的金属堆积和成形凸缘的成形精度的影响并不明显,但增大旋轮轴向进给比,可以降低成形过程中坯料开裂失效的可能性,可以使得成形凸缘的不均匀变形程度减小。 相似文献
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高温合金旋压塑性变形稳定性试验研究 总被引:1,自引:0,他引:1
通过高温合金管材不同旋压变薄率的试验,探讨了常用高温合金的旋压工艺参数。在高温合金管材可旋性试验的基础上,有效控制塑性变形的稳定流动,可以旋压高精度薄壁管材。当坯料退火以后,经旋压工艺参数优化,可提高变形区金属三向塑性流动的稳定性,并有助于获取尺寸精良的管材。 相似文献
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Effects of material properties on power spinning process of parts with transverse inner rib 总被引:1,自引:0,他引:1
Material properties of blank have a great effect on power spinning process of aluminum alloy parts with transverse inner rib. By using finite element(FE) and Taguchi method, the effects and significance of five key material parameters, namely, anisotropic index in thickness direction, yield strength, hardening exponent, strengthening factor and elastic modulus on the formability of inner rib, tendency of wall fracture and degree of inhomogeneous deformation of finished spun parts were obtained. The achievements provide an important guide for selecting reasonable spinning material, and are very significant for the optimum design and precision control of power spinning process of parts with transverse inner rib. 相似文献
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Based on the process experiments, micrography analysis was dedicated to advancing the understanding of plastic flow of the metal in backward ball spinning of thin-walled tubular part with longitudinal inner ribs. Micrography analysis reveals that severe plastic deformation leads to grain refinement, grain orientation and grain flow line of the spun part. Based on rigid-plastic finite element method, DEFORME3D finite element code was used to simulate and analyze multi-pass backward ball spinning of thin-walled tubular part with longitudinal inner ribs. Finite element simulation results involve the distributions of the strain, the shape variation of the inner ribs as well as the prediction of the spinning loading. 相似文献