共查询到19条相似文献,搜索用时 552 毫秒
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研究基于曲面重构技术的塑料异型材挤出模具制造技术。采用三角网格法对塑料异型材挤出模具机颈段数据进行测头半径补偿;采用基于3个基准点的对齐方法进行直接对齐;基于扫掠造型方式进行曲面重构。经试验验证:采用曲面重构技术进行挤出模制造,缩短了挤出模具的开发周期,提高了模具质量。反求工程技术为国外先进模具的设计制造国产化提供了重要手段,为企业异型材模具设计与制造提供参考。 相似文献
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针对塑料异型材挤出模头中几何形状复杂的功能块流道设计依赖于经验,常常造成模头挤出不稳定的现状,应用Polyflow软件,以挤出模头出口截面上各子区域的平均流速相等的设计准则,对功能块流道的合理设计进行了研究,以2种不同类型的功能块为例,给出了数值设计的方法和步骤,获得的功能块流道结构与适用的挤出模头设计基本一致。 相似文献
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基于有限元的塑料异型材挤出模头分流段设计 总被引:1,自引:1,他引:0
针对由于模具设计不合理导致流动性能较差的塑料异型材挤出模具,通过有限元软件ANSYS模拟计算,根据流动平衡理论,分析了模头分流段流动平衡方面存在的问题,以流动平衡为原则对其设计加以改进,对比改进前后理论分析结果与模头的实际使用情况,提出了提高挤出模头稳定性的模头分流段流道设计准则。 相似文献
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异型材挤出模流道的设计 总被引:1,自引:0,他引:1
塑料异型材的挤出成形是一个连续的动态过程,塑料在挤出机中经过熔融、塑化、稳流、分流、成形和冷却定型一系列过程,从而成为连续的异型材产品.基于大量工程实践,浅析了异型材挤出口模定型段、压缩段、分流段和发散段流道设计. 相似文献
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Hanliang Zhu Tao Wei Malcolm J. Couper Arne K. Dahle 《JOM Journal of the Minerals, Metals and Materials Society》2013,65(5):618-624
Aluminum alloy extrusions with variations in profiles and Fe-rich particles were produced using different extrusion dies and iron contents. A microstructural examination of the extrusion surface shows that the extrusion profile and iron content have a great effect on the size and number of Fe-rich particles, grain size, texture, and fraction of high-angle grain boundaries due to varying localized plastic deformation and temperature in the extrudate. After etching and anodizing, surface imperfections such as grain boundary grooves that influence the final surface appearance are formed on the extrusion surfaces. The severity of grain boundary grooves is found to be directly linked to the number of Fe-rich particles. Hence, the extrusion profile has a dramatic influence on surface imperfections and the appearance of the final anodized extrusions through its effect on the surface microstructure. 相似文献
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介绍了几种多腔复杂工业铝型材的模具设计方案。对上模采取二次分流的形式来改善均匀流动和充分焊合,从而合理地设计出这类型材的模具。 相似文献
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M.J. Anderson K. McGuire R.C. Zante W.J. Ion A. Rosochowski J.W. Brooks 《Journal of Materials Processing Technology》2013,213(1):111-119
The dies used in the extrusion of nickel based super alloys are subject to severe mechanical and thermal stresses, resulting in shortened life and high manufacturing costs. It is necessary to understand the dominant damage mode in order to guide improvements for increased tool life. The operation under examination consists of the hot extrusion of a nickel based superalloy using nitrided hot work tool steel, glassed workpieces and graphite lubrication. The investigation was conducted through a combination of metallurgical analysis, metrology and finite element analysis. Out of the damage modes observed under these conditions, the plastic deformation of the substrate was found to be the cause for tool failure. This paper discusses the relationship between plastic deformation of the substrate and the formation of scoring marks, which fail the die. 相似文献
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Multi-hole pocket dies are a type of extrusion tooling setup commonly used across the aluminium extrusion industry for efficient production of solid aluminium profiles. Such dies are designed on the basis of experience and corrected after a number of trial extrusion runs before becoming usable. Computer simulation based on the finite element method (FEM) is in principle capable of predicting metal flow through the dies designed, but it is yet a huge technological challenge to simulate the extrusion process to produce profiles of industrial significance. The present research was attempted to investigate the effect of steps in the die pocket on metal flow to produce two chevron profiles with unequal thicknesses through two-hole dies, by means of 3D FEM simulation of extrusion in the transient state. The results showed that the pocket step could be effectively used to balance metal flow. Extrusion experiments validated the predictions of metal flow, extrudate temperature and the pressure required for extrusion through the pocket dies with three different designs. 3D FEM was demonstrated to be a powerful tool in optimising die design and decreasing the number of trial extrusion runs. 相似文献
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