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4J× 12汽车车轮轮辐中心孔是典型的轴对称翻边件 ,采用计算机仿真技术分析其成形过程 ,并对其成形区的应力、应变分布规律进行探讨 ,对影响翻边成形的关键参数———冲模斜角进行了优化 相似文献
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内孔翻边时变形区应力应变规律研究 总被引:2,自引:5,他引:2
内孔翻边是冲压成形生产中的一个常用工序,变形区的变形特征是一种物理和几何非线形的变形过程.用主应力法对内孔翻边成形过程中变形区的应力、应变及模具上的受力进行了理论分析,得出了变形区的应力、应变随冲模斜角的变化规律.结合具体算例,用ADINA软件模拟了变形区的应力、应变及模具上的受力,得出了与理论分析相同的结论,即翻边使变形区变薄;材料会沿径向收缩;冲模斜角越大,孔边缘处等效应变越大,冲压力也越大. 相似文献
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将 1 2× 4J轮辐翻边的变形区看作是平面应力状态 ,从翻边高度与初始孔径变化规律及翻边变形区径向应变和轴向应变的变形规律出发 ,探讨了 1 2× 4J轮辐翻边开裂缺陷的形成原因 ,对现有的翻边成形工艺提出了改进方案。 相似文献
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通过对外缘外曲翻边应力应变状态的分析,提出了预规变形区的变形和对毛坯尺寸进行修正的方法,从而提高翻边成形精度。 相似文献
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《中国有色金属学会会刊》2015,(7)
拉伸翻边工艺受多种几何形状、材料和工艺参数的影响。冲模间隙和初始翻边长度是影响边界裂纹位置和沿模侧面半径应力分布的主要参数。采用数值模拟研究AA-5052铝板的非轴对称拉伸翻边工艺,预测翻边的变形行为、裂纹位置和扩展,并且研究拉伸翻边过程中冲模间隙、翻边长度、冲模外形半径和摩擦力的影响。利用实验研究对模拟结果进行验证。结果表明,裂纹长度随翻边长度的增加而增加,翻边长度在周向的影响比在轴向的影响大,冲模间隙比翻边长度对裂纹扩展的影响更大。当冲孔外形半径比模的外形半径小时,周向应变增加,这导致了较快的边裂纹扩展。在边裂纹位置和变形负载方面,模拟结果和实验结果较好吻合。 相似文献
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钢制车轮轮辐拉深翻边成形复合模设计 总被引:1,自引:0,他引:1
分析了钢制车轮轮辐的冲压成形工艺,提出了一种新的拉深翻边模具,阐述了复合模的工作原理及动作过程,确定了模具设计要点和结构特征参数.使用拉深翻边模可以高效优质地完成轮辐成形加工.该模具结构设计合理,动作安全可靠,生产效率高,产品质量好. 相似文献
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二级浮动弹压复合模设计 总被引:3,自引:1,他引:2
分析了脱排油烟机内支架复合冲压成形工艺方案,介绍了相应冲模结构设计。冲压工艺有冲裁、弯曲、不规则翻边、胀形、局部压凸、整形等。为优化冲压工艺,降低生产成本,第2副冲模采用了下模部分二级浮动弹压的结构,成功实现局部胀拉和翻边工艺以及压凸、弯曲、整形多道工序一次成形。 相似文献
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Shangguan Hao-long Kang Jin-wu Yi Ji-hao Deng Cheng-yang Hu Yong-yi Huang Tao 《中国铸造》2018,15(3):210-215
3D printing technology has been used for sand molding and core printing, but they simply substitute the traditional molding and core making method without changing the shape or size of the sand mold(core) and their dense structure. In this study, a new type of hollow mold based on 3D printing is presented. The new type of mold is a rib reinforced thickness-varying shell mold. This mold design can realize the controlled cooling of castings, i.e., different cooling rates at different areas, and improve the temperature uniformity of a casting after its solidifi cation. Therefore, the performance of castings can be improved and their residual stress and deformation can be reduced. This kind of new mold was applied to a stress frame of A356 aluminum alloy. The 3D printed rib reinforced thickness-varying shell mold was compared with the traditional dense mold, and the castings obtained by these two kinds of molds were also compared. The experimental results showed that the rib reinforced shell mold increased the cooling rate of the casting by 30%, tensile strength by 17%, yield strength by 11%, elongation by 67%, and decreased its deformation by 43%, while sand consumption was greatly reduced by 90%. 相似文献
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通过分析电池盒成型工艺特点,产品有一处薄壁位置,很容易造成注射时注不满和取工件时易使工件变形,从而导至工件报废。重点介绍了该处模具结构特点,对同类模具设计有一定的参考价值。 相似文献
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简要分析了精密复杂模具的热处理变形,并提出了几种常用精密复杂塑料模具钢,同时介绍了精密复杂模具的预硬型热处理、时效硬化型热处理、沉淀硬化热处理、渗氮热处理、真空热处理和深冷热处理,其核心是为了减少模具的变形,提高模具的精度,延长模具的使用寿命。 相似文献
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1 INTRODUCTIONHybridformingisanewmethodformanufactur ingofmetalsheetandplasticcombinedmacro com positecomponents[1] .Twometalsheetswith pre treatedsurfacesareheldtogetheralongtheiredgesbyclampingoperationofthemoldforhybridformingthroughtheinjectionmachine … 相似文献
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Since composite components have been used in many fields with high-performance requirements, their quality is always of great concern. During production, improving temperature uniformity of the mold, which has close contact with the composites, is critical for reducing component deformation. However, the bottleneck is realizing the rapid and accurate prediction for the mold temperature distribution. Therefore, this paper designs a new hybrid modeling method for mold temperature prediction, which is driven by both physical and data models. The proposed method is applied in a case study of quality assurance for a plate component. Its advantages are also validated. 相似文献
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卡箍是一种半环形薄壁的304不锈钢铸件,该铸件具有充型难、易变形、易缩松的特点,且外表面不加工,表面质量要求严格,因此铸造生产比较困难.作者经过多次试验改进,采用一组两件的方式,成功地实现了该铸件的熔模铸造生产. 相似文献
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简要分析了精密复杂模具热处理变形及硬度问题,介绍了PMS钢的性能及特点,该钢固溶后硬度低便于机械加工,成形后时效,模具硬度提高,减少了模具热处理变形,是精密复杂塑料模具最佳模具材料,并介绍了PMS钢的热处理工艺及应用。 相似文献