共查询到19条相似文献,搜索用时 156 毫秒
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分析了热保护器外壳制件的结构特点和冲压工艺性,完成了热保护器外壳拉深级进模设计。解决了深矩形件成形、矩形小过渡圆角区起皱及矩形长宽比大的制件容易拉裂问题。生产的制件质量稳定,对同类零件的冲压工艺和模具设计有一定参考作用。 相似文献
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首次拉深系数对深筒制件多次拉深成形工艺和成形件质量有重要的影响,工程应用中主要依靠经验和反复试错的方法来确定,如何快速、准确地设定深筒制件首次拉深系数成为生产中亟需解决的问题。提出了一种深筒制件首次拉深系数的确定方法,该方法以控制筒壁最大减薄率为目标,基于有限元模拟技术,应用0.618优化方法确定首次拉深系数。将该方法应用于某深筒制件案例,结果表明:该方法可以快速、准确地获得与经验法一致的结果;同时,使用DC01钢及相似材料进行多次拉深时,将首次拉深最大减薄率控制在11%,后续拉深能够顺利进行。 相似文献
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分析了圆筒内六角阶梯的成形工艺,采用冲孔、拉深、底孔倒角及落料的冲压工序,配合压力机上的自动送料装置实现自动化生产;并介绍了制件的排样、模具结构及部分拉深凸、凹模的设计与制造。模具经实际生产验证:成形的制件质量稳定,生产效率高,满足大批量生产的需求,可为类似的制件成形提供参考。 相似文献
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分析了鼠笼端面透盖和闷盖冲压组合成形反拉深工艺,介绍了反拉深模具设计要点,计算了反拉深模的冲压力,设计了拉深模和反拉深模。合理的工艺对简化模具结构,减少模具数量,降低成本,提高制件质量有重要意义。 相似文献
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采用落料、拉深、变薄拉深三工序依次连续进行了复合冲压成形工艺.设计了一种用于液压卡套坯件批量生产的一次成形复合冷冲模.模具一个工位,即一次冲压行程成形卡套坯件.介绍了相应的冷冲压工艺数据计算方法和模具结构. 相似文献
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采用流函数法,通过建立流线型速度场对模腔形状进行了优化.使用有限元软件建立了矩形管的拉拔模型,模拟了整个冷拔过程.得到了管料的应力、应变分布及金属流动的变化规律.分析得知,管料在冷拔过程中发生不均匀变形,在矩形截面圆角处应力和等效塑性应变均大于直边,这一结论对在生产中提高钢管质量有实践指导意义. 相似文献
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Wu-Jiao Xu Kai-Qing Wang Ming-Ping Zou Peng-Cheng Wang 《Journal of Materials Engineering and Performance》2013,22(4):974-982
This paper focuses on improving the quality of aluminum rectangular tube in the cold drawing process. The newly developed drawing tools (i.e., the drawing die and the plug) which are considered as one of the most significant factors influencing the final forming quality are proposed. The new-type drawing die is designed with the “convex hull” shape in sizing zone corner and the plug is featured with a “boss club” structure in sizing zone. The equivalent plastic strain, drawn tube’s dimensional accuracy, contact stress distribution, and drawing load have been analyzed for the conditions under which the original tools and the new-type ones have been used, respectively, based on finite element simulations. The simulation results show clearly that the discrepancy of plastic strain in the axial cross section and the tube axial elongation are smaller when the new-type die is employed, which indicates the more uniform metal deformation and steady material flow. Besides that, the fluctuation of wall thickness is also unobvious showing the new-type die is very helpful to improve the tube dimensional accuracy. The newly developed plug can cause higher compressive plastic strain and contact stress, which are crucial to guaranteeing the high surface quality. An experiment on the cold drawing process of the aluminum rectangular tube has been performed. The comparisons of the drawn tube dimensions, e.g., height/width and wall thickness, have been made between simulation results and practical production. Meanwhile, the surface finish has also been measured. The experimental result exhibits that the drawn tube can better fulfill the requirements of the design and usage when the new-type tool is adopted. 相似文献
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以一大型烧烤炉上盖的拉伸模设计为例,首先用Pro/E建模并分析落料尺寸和压力中心,然后用先进的CAE软件FASTFORM Advanced作为辅助工具,确定模具设计的其它参数,再结合生产实际进行验证。为这类拉伸件的模具提出了一种独特的、先进的基于数字化成形技术的设计方法。 相似文献
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通过对A侧管的工艺分析及计算,提出了落料、冲孔、拉伸成形工艺,介绍了连续拉伸模的冲压方案。经多年来生产及验证,该模具结构合理、可靠,加工质量好,生产效率高,对此类零件的级进模设计工作者有重要的参考价值。 相似文献