共查询到17条相似文献,搜索用时 187 毫秒
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从技术及应用的角度介绍了塑料型材挤出模CAE技术的概况、内涵及发展趋势。系统地将挤出模CAE技术的发展从五个方面给予了总结。 相似文献
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综述了塑料异型材挤出模CAE技术的研究进展,讨论了CAE技术中的熔体流动分析、挤出胀大分析、定型冷却分析的研究成果和发展趋势。 相似文献
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利用Unigraphics NX(简称UG)软件设计了8孔微孔薄膜挤出模,并对挤出模成型段及挤出物部分进行了CAE模拟,利用参数渐变法研究了不同拉伸应力下挤出物外形及横截面形状尺寸的变化。结果表明,随着拉伸应力的增大,挤出物横截面尺寸越来越小;气孔由圆形变为菱形、椭圆形;挤出物表面具有明显的波纹特征。 相似文献
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本文从技术及应用角度系统地介绍了塑料注射成型、气体辅助注射成型、反应注射成型、挤出成型、吹塑成型和热成型CAE技术的概况、内涵及发展趋势。 相似文献
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对挤出吹塑型坯吹胀过程的CAD/CAE技术进行了初步研究。此技术可通过对吹塑CAD几何造型,CAD/CAE间信息传递,以及CAE分析的集成,实现对挤出吹塑型坯吹胀成型工艺过程的模拟和分析。最后用实例验证了此技术的可行性,为塑料制品的设计、材料选择、模具设计、吹塑成型工艺的制定及吹塑成型工艺过程的控制提供了科学依据。 相似文献
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流线型挤出模参数化建模方法研究 总被引:1,自引:0,他引:1
在编程实现对型材截面轮廓凸凹性自动判断的基础上,采用射线法与比例间隔法相结合的方法,确定流道人口圆周上型值点的位置,以三次多项式作为流道模腔型曲线的数学模型,依据流线型要求给出的初始、边界条件得出型曲线的数学方程,构建了挤出模流道的三维参数化模型,为挤出模CAD/CAE的双向集成技术研究奠定基础。数值分析结果显示,该方法创建的流线型流道模型,其流动稳定性和平顺性都优于直线型流道。 相似文献
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塑料异型材流线型挤出模头形状复杂,模腔表面要求平滑过渡,无滞料,流速要求稳定增加,其结构设计和曲面设计难度大,目前主要依赖于设计者的经验和操作者的熟练程度,设计效率低,无法满足越来越高的整体质量要求。针对以上问题,提出了模具内腔结构曲面的三维建模方法,基于UG和VS平台,应用UG/Open二次开发和MFC技术,实现了多封闭环快速识别,草图曲线一键排序,通过人机交互界面进行曲线匹配和曲面构造,从而搭建了从二维草图到三维建模的CAD集成模块,有效地提高了挤出模流道曲面设计效率和质量,并为后续CAE分析和CAM加工提供有力支撑。 相似文献
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R. S. Lenk 《应用聚合物科学杂志》1978,22(7):1775-1779
A simple method is presented for calculating the pressure drop for the flow of power law liquids in dies with a wide slit profile and with vertical and/or lateral tapers, as well as in dies with the shape of a circular truncated right cone. Tapered dies are known to give improved extrudate quality and/or higher output rates without encountering extrudate defects which occur in dies with parallel channels at similar extrusion pressures. A possible ultimate optimization of the extrusion process—as far as die design is concerned—is discussed. It is suggested that this be based upon an extension of the method from dies with a rectilinear convergent taper to dies with a curvilinearly converging channel aspect the generation of which latter is indicated. 相似文献
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Bruce J. Kellett Claude Carry Alain Mocellin 《Journal of the American Ceramic Society》1990,73(7):1922-1927
Workability of 3-mol%-yttria-stabilized tetragonal ZrO2 has been gauged through a series of extrusion experiments performed under vacuum with graphite dies at 1500°C and 35 MPa piston stress. It is shown that dense and smooth extrusions can be obtained from solid billets when graphite paper is used as a lubricant. Sigmoidal dies and conical dies with cone angles of 18.4°, 26.6°, and 45° and diameter ratios of 1.5, 2, and 3 were used to explore extrusion behavior. Observed piston velocities correspond to what may be predicted from the experimental uniaxial constitutive creep equation and a simple slab analysis. A precise analysis, however, is not attempted because of lack of steady-state behavior of the material itself. 相似文献
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A vibration force field was applied to the whole process of polymer plasticating extrusion by periodical vibration of the screw. It observably affected both the extruder screw extrusion characteristics and the round-section die extrusion characteristics. It also affected the polymer plasticating extrusion process and the quality of the extrudates. An analytical model of typical dynamic extrusion of round-section dies was created. The results showed that a vibration force field can improve extrusion output. 相似文献
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塑料异型材挤出口模的三维罚有限元设计 总被引:1,自引:2,他引:1
讨论了现有塑料异型材挤出口模研究中的流变学分析方法,指出了前人运用流变学方法设计挤出口模的不足。本文采用三维罚有限元方法,对幂律流体在塑料异型材口模中的流动进行了计算机模拟研究,阐述了采用三维罚有限元方法进行塑料异型材挤出口模设计的重要意义 相似文献