共查询到19条相似文献,搜索用时 203 毫秒
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为了得到成形质量高、变形均匀的QSn7-0.2连杆衬套筒形件,采用有限元数值模拟的方法对正、反旋两种筒形件强力旋压的旋压方式进行分析,介绍了两种筒形件强力旋压方式的工艺原理,并制定了相应的成形工艺方案。使用锡青铜作为研究对象,利用Simufact有限元仿真软件,对两种不同的筒形件强力旋压方式的成形过程进行了数值模拟。结果表明,正旋的成形质量好于反旋;正旋的瞬时最大等效应力应变值及径向和切向的最大应力分量的变化幅度均小于反旋;反旋的旋压时间小于正旋,在精度允许的范围内,反旋的生产效率高于正旋。 相似文献
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基于BP神经网络响应曲面的筒形件强力旋压工艺参数优化研究 总被引:2,自引:0,他引:2
以BP神经网络为基础构建响应曲面,建立材料参数、筒形件强力旋压工艺参数等和旋压力最大变化值之间的关系,并用粒子群优化算法求解,获得符合优化条件的最优解,从而实现筒形件强力旋压工艺参数的优化。经MARC模拟验证,取得了较好的效果。 相似文献
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带内筋铝合金筒形件强力旋压成形工艺研究 总被引:1,自引:0,他引:1
通过试验和利用有限元软件ANSYS/LS-DANA进行数值模拟,探讨了带内筋铝合金筒形件强力旋压变形过程中应力、应变的分布规律,分析了各种因素及工艺参数对成形的影响,合理地描述了实际产品的生产过程。结果表明,该加工过程适于采用大减薄率的一道次成形。在坯料的自由端施加一定的阻力,在合理的范围内尽可能地选择较大的进给比,且在虑减薄率和进给比等各种工艺参数的综合影响的基础上,可以加工出较好的产品。 相似文献
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带内筋筒形件强力旋压成形试验研究 总被引:6,自引:1,他引:6
通过选取不同的壁厚减薄率和旋轮进给比作为工艺参数,利用双旋轮强力旋压机对带内筋筒形件作旋压加工实验。根据实验结果分析了各种生产缺陷产生的原因,并提出了一定的解决办法,从而为减少大规模生产的经济损失,生产出合格的工件提供了理论和实践依据。 相似文献
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Role of ball size in backward ball spinning of thin-walled tubular part with longitudinal inner ribs 总被引:1,自引:0,他引:1
Shuyong Jiang Zhengyi Ren Chunfeng Li Kemin Xue 《Journal of Materials Processing Technology》2009,209(4):2167-2174
As a successively and locally plastic deformation process, backward ball spinning is applied in order to manufacture thin-walled tubular part with longitudinal inner ribs. Based on the experiments and rigid-plastic finite element method (FEM), the influence of the ball size on deformability of thin-walled tubular part with longitudinal inner ribs during the backward ball spinning is investigated in the present study. The size of ball plays a significant role in backward ball spinning of thin-walled tubular part with longitudinal inner ribs. The size of the ball not only is a critical factor in determining the magnitude of the spinning force, but also has a great influence on the surface finish of the spun part, the steady flow of the metal material as well as the formability of the inner ribs. The results have shown that increasing the size of the balls contributes to the formability of the inner ribs as well as the steady flow of the metal material on the surface of the spun part, but too large ball size leads to poor dimensional accuracy and inferior surface quality of the spun part. 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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筒形件强力旋压工艺参数选取方式分析 总被引:9,自引:2,他引:9
强力旋压是制造薄壁简形件的一种高效加工方法,但在加工过程中会受到很多工艺参数的影响。为改善加工工艺和提高产品质量,对包括旋轮形状在内的几种影响较大的工艺参数进行了分析比较,论证了工艺参数的选取与产品生产缺陷之间的内在规律,提出了可行的选取方式。认为:旋轮形状参数要依据理论公式和经验在一定范围内选择;旋轮进给比要考虑壁厚减薄率、管坯厚度、旋轮直径以及圆角半径等因素的影响,通常在0.5mm/r~1.5mm/r之间选取;普通简形件采用多道次成形,道次减薄率应逐渐增大,道次减薄量由大到小递减;带内筋筒形件采用大减薄率一道次成形或采用不同的芯模实现预成形和终成形;旋压力的大小要综合考虑其它工艺参数的变化情况,合理施加。这样,经过一定的调整就可以加工出质量较好的产品,从而为该工艺提供了一定的技术支持和理论保证。 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