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首页> 外文期刊>International Journal of Mechanical Sciences >Analysis and die design of flat-die hot extrusion process - 2: numerical design of bearing lengths
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Analysis and die design of flat-die hot extrusion process - 2: numerical design of bearing lengths

机译：平板模具热挤压工艺的分析和模具设计-2：轴承长度的数值设计

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This paper deals with the assignment of bearing lengths for the control of material flow in the flat die hot extrusion. The design process makes the use of the three-dimensional non-steady analysis using the thermo-rigid-viscoplastic finite element method that includes an automatic remeshing module. The exit velocity distribution of the workpiece obtained from the analysis results was used to find appropriate values for the factors used in the proposed bearing length design equation. This equation for designing bearing lengths is a function of the cross-sectional thickness and distance from the die center of die exit section. A geometric factor was included in formulation of the design equation to consider the end region of the die exit. The appropriate values of factors were determined from three-dimensional analyses of flat-die hot extrusion processes with single and double channel-sections. The analysis of a flat-die hot extrusion process with a L-section was used to verify the proposed design equation. It was found that the design equation determined bearing lengths that resulted in a fairly uniform exit velocity distribution throughout the extruded section. From the results of this study, it was found that the proposed design equation can be effectively used to estimate appropriate bearing lengths.
机译：本文讨论了轴承长度的分配，以控制平模热挤压中的材料流动。设计过程利用了三维非定常分析，该分析采用了热刚粘塑性有限元方法，该方法包括一个自动重定格模块。从分析结果获得的工件出口速度分布用于为建议的轴承长度设计方程式中使用的因素找到合适的值。该设计轴承长度的方程式是横截面厚度和到模具出口部分模具中心距离的函数。在设计方程式的公式中考虑了几何因素，以考虑模具出口的末端区域。从具有单通道和双通道截面的平模热挤压工艺的三维分析确定合适的因子值。对具有L型截面的平模热挤压工艺进行了分析，以验证所提出的设计方程。发现设计方程确定了轴承长度，轴承长度导致整个挤压段的出口速度分布相当均匀。从这项研究的结果发现，所提出的设计方程可以有效地用于估算合适的轴承长度。

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