共查询到19条相似文献,搜索用时 218 毫秒
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挤压速度对铝型材分流模寿命影响的模拟分析 总被引:1,自引:0,他引:1
挤压速度是影响铝型材分流模寿命的主要因素之一。不同挤压速度下,模具所受温度和压力不同,对模具寿命产生直接影响。以矩形管铝型材挤压为例,利用Deform有限元分析软件对挤压过程进行数值模拟,得到不同挤压速度下分流模温度和压力变化情况。结果表明:随挤压速度的增大,分流模各工作部位温度逐渐升高,而所承受压力则先降低后升高。探讨了温度和压力的改变对模具寿命的影响机制,指出挤压速度对模具寿命的影响表现为加速模具各工作部分的塑性变形、磨损和应力集中部位失效,以及加剧挤压模的冷热疲劳现象。 相似文献
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铝材长方形空心管挤压过程数值模拟与模具结构优化设计 总被引:3,自引:0,他引:3
对AA1100铝材长方形空心管的挤压过程使用数值分析软件SuperForge进行数值模拟。在挤压生产中,金属流出工作带时的流速均匀性是得到高质量型材的关键。在挤压生产中通常采用几种方法修改模具,消除流速不均,例如修改分流孔的大小、形状和位置分布,修改工作带长度和焊合室形状尺寸等。本文通过数值模拟发现在长方形空心管挤压的初始模具设计中型材截面流速不均匀,造成端面不平。对此,提出了三种模具修改方案,并分别对其进行了数值模拟,经过分析比较确定了最佳模具设计方案,由此方案可以生产出合格的挤压件。 相似文献
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分流组合模挤压铝合金口琴管的数值模拟 总被引:2,自引:1,他引:1
采用刚粘塑性有限元法,在DEFORM-3D有限元商业软件上成功实现了铝合金口琴管分流组合模挤压过程的三维数值模拟,获得了分流组合模挤压过程中材料的流动规律,挤压力、应力场、应变场和温度场的分布,以及模具出口处金属流速的分布情况。通过数值模拟发现,型材出口流速不均匀,造成端面不齐,对此,提出了模具修改方案,通过调节模具工作带的长度,实现了型材挤压出口流速均匀的目的,从而保障了型材的产品质量。模拟结果为模具的优化设计及工艺参数的选取提供了理论参考。 相似文献
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To avoid distortion of complex extrudate profiles, it is essential that the exit velocity of the metal is uniform. The most important design parameter that controls the exit velocity is bearing length. However, this factor is not sufficient to achieve optimal design settings. This paper proposes an innovative layout design approach using a geometry based bearing length design methodology to minimise variations in exit velocity. This paper focuses on single hole extrusion dies and develops an optimisation algorithm suitable for any die profile. Since the optimised die design produces less bearing length difference, more uniform exit velocity and higher design quality would be achieved using the proposed approach. 相似文献
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According to the rigid-viscoplasticity finite element method, the porthole die extrusion process of an aluminum harmonica-shaped tube was successfully simulated based on software Deform-3D. The distribution of stress field, effective strain field, velocity field and temperature field during the extrusion process were discussed and the metal flow in welding extrusion was analyzed. The simulation results show that the material flow velocities in the bearing exit are non-uniform with the originally designed die and the forepart of the profile is not neat or even. Aiming at solving this problem, the modification method of die structure was improved. The result shows that the uniform material flow velocities in the die exit and a perfect extruded are obtained by modification bearing length. 相似文献
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导流室设计对薄壁铝型材挤压出口速度的影响 总被引:1,自引:0,他引:1
采用基于ALE算法的HyperXtrude软件,模拟薄壁铝合金型材挤压模具导流室各种设计的金属流动情况,分析了各设计参数对金属流速的影响规律,并统计挤出型材断面上挤出方向的流速均方差S.D.作为衡量流速均匀程度的指标。分析结果表明,在设计断面不对称、壁厚不等型材模具时,有时需将型材的质心相对于模具的中心做一定距离的调整。型材断面上各处的壁厚差异和局部质心偏离都对流速有影响,但壁厚差异对于流速均匀程度的影响更大。在模具的型腔内添加阻流块结构,流速均匀程度可大为改善。调节阻流块的宽度、高度、形状、位置等参数,能够完全消除流速不均匀,但如果尺寸调整超过最佳点,流速均匀程度将迅速恶化。根据最优模拟结果对应的设计生产模具,并进行挤压实验,所得型材的尺寸质检合格,模具达到"零试模"要求。 相似文献
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In this paper, a strategy for the thermo-mechanical processing of aluminum profiles by subsequent electromagnetic forming and heat treatment is given. A tool coil for electromagnetic compression was positioned behind the die exit and coaxially to the extrudate in order to reduce the workpiece cross section locally. Additionally, a counter die in the shape of a mandrel was mounted to the mandrel of a porthole extrusion die which extended into the tool coil. Besides achieving a more defined geometry in comparison to a free forming operation, by this also the geometrical complexity of locally compressed areas can be achieved. 相似文献