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第3讲 冷挤压零件设计
冷挤压零件设计是根据挤压变形的需要,对原产品零件图进行适当修改,使之具有良好的挤压工艺性,设计成适于冷挤压加工的零件图。冷挤压参数设计是冷挤压工艺设计的基础。 相似文献
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对内螺旋状零件的冷挤压成形过程进行数值模拟,系统地研究了摩擦系数、螺旋角和挤压角等因素对内螺旋状零件冷挤压成形过程中凸模所受挤压力和成形缺陷的影响,并对挤压成形工艺参数进行了优化.研究结果表明:摩擦系数、螺旋角和挤压角等因素对内螺旋状零件冷挤压成形过程中挤压力存在显著的影响.随着摩擦系数的增加,挤压力呈线性增加;随着螺旋角和挤压角的增加,挤压力呈非线性增加.摩擦系数和螺旋角等对内螺旋状零件的冷挤压成形缺陷影响较大,而挤压角的影响较小.采用优化后的工艺参数对内螺旋状零件进行了冷挤压成形实验,获得了合格的制件.本文的研究结果为内螺旋状零件的冷挤压成形提供了工艺指导,具有实际的应用价值. 相似文献
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针对传统有限元法进行冷挤压成形模拟时出现的网格畸变问题,开展基于物质点法冷挤压成形过程的数值模拟研究。通过建立冷挤压成形过程物质点法仿真模型和编制程序,分别对锥模和平模两种情况下的冷挤压成形过程进行模拟研究,得到其变形规律,并与实验和有限元方法计算结果进行比较。通过锥模冷挤压成形过程的数值模拟,得到不同挤压量下挤压件形状和挤压件高度值,与实验结果吻合较好,最大误差为0.52%。通过平模冷挤压成形过程的数值模拟,得到不同挤压量下挤压件的变形规律,当压下量较大时,物质点法能较好地实现冷挤压成形过程的数值模拟,而有限元法出现了网格畸变。研究结果表明,物质点法模拟冷挤压成形过程是可行的,能够有效地消除网格畸变。 相似文献
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对冲击块零件进行了工艺分析,选择了挤压端面齿毛坯的正确形状,确定了零件冷挤压图及毛坯尺寸,制定了冲击块冷挤压工艺流程图,并对零件的挤压模进行了简单的介绍。 相似文献
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反挤压凸模形状对挤压成形工艺的影响 总被引:3,自引:0,他引:3
通过数值模拟分析,比较了不同形状反挤压凸模对挤压过程中金属流动、挤压力以及凸模温升等方面的影响,进而得出凸模形状对反挤压成形工艺的影响,为挤压凸模及挤压件形状的优化设计提供一定的参考依据。 相似文献
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The subject of theoretical analysis for the extrusion of profiled sections has been heavily worked on by many researchers. However most of these have concentrated on the extrusion of sections with some axes of symmetry. This paper aims to provide a new formulation for the analysis of the extrusion process for non symmetric profiled sections with no axis of symmetry. The upper bound theorem has been used to obtain an approximate solution. Both flat faced dies and bilinear dies were used in the present work. In fact this formulation could be applied to the extrusion process of hollow sections as well as solid parts. The advantage of the proposed method is the new way of discretizing the deforming region in the extrusion of shaped sections based on which a generalized kinematically admissible velocity field was formulated. For a given extruded profiled section this method employs fewer number of sub-divisions than before, giving a lower upper bound value for the extrusion power. The generality, easy application to different sections, short computing time and fairly realistic outcomes of the analysis could be regarded as other strengths of the present method. The lack of incorporation of temperature effects for hot extrusion processes could be mentioned as one of the disadvantages of the present method. The position of the die cavity was also optimized using the new method. A design map for the extrusion die geometry was also given as a graph of extrusion pressure versus the optimum die length for the bilinear dies with different frictional conditions and reductions of area. The extrusion of L-shape profiled section was chosen as a sample since it had no axis of symmetry. Extrusion dies were also manufactured and experiments carried out to verify the theoretical results. Finite element simulation for the extrusion of U, T and I-shape profiled sections was also carried out using ABAQUS\CAE\Explicit commercial software. 相似文献
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热挤压对SiCw/MB15镁基复合材料组织和性能的影响 总被引:2,自引:0,他引:2
利用SEM,TEM,X射线衍射仪等方法,研究了挤压对SiCw/MB15镁基复合材料组织和性能的影响。结果表明:热挤压后复合材料组织更加均匀,SiC晶须长轴与挤压方向平行,晶须的增强作用得到了充分的发挥,显著提高了SiCw/MB15镁基复合材料的力学性能。 相似文献
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基于UG的铝型材挤压分流模设计KBE系统 总被引:2,自引:2,他引:0
结合铝型材挤压特点,将KBE系统引入型材挤压分流模设计中,在基于知识工程的铝型材挤压分流模智能设计系统框架内,将铝型材挤压分流模设计知识通过UG系统用户界面实现同分流模几何特征构建的搭接。系统是以UG NX为CAD/CAE开发平台,以VC++、UG/API、UG/GRIP等为编程开发语言环境,以工程实际经验及专家知识为分流模设计指导,并综合运用UG多种二次开发手段开发各个功能模块,包含零件管理信息、材料分析、截面特征、挤压工艺参数确定、模具结构设计、模具强度校核以及模具其他尺寸设计。系统的开发是KBE与CAX系统融合的一次有益尝试,对于挤压分流模KBE及计算机辅助设计具有积极的推广作用。 相似文献