菜单
  

    system is called conformal cooling channels. The application of this
    new kind of cooling channels is based on the development of solid
    free-form fabrication (SFF) technology. Some of works studied the
    advantages of the conformal cooling system and how to optimize
    the conformal cooling channels in injection molding tools.
    11,12
     The
    results were reported that conformal cooling channels offer better
    temperature uniformity within the mold cavity and better molded
    part’s quality compared to straight cooling channels. SFF or rapid
    prototyping technology brings the opportunities to fabricate very
    complex conformal cooling channels inside the mold core and mold
    cavity,
    13
     but this technique is still expensive, especially for large-
    sized mold. On the other hand, the kinds of metal powders used in
    rapid prototyping techniques, for example 3D printing, selective
    laser sintering, electron beam melting, and laser engineered net
    shaping, are limited. It means that the choice of mold material with
    appropriate thermal and mechanical properties for making
    conformal cooling channels by SFF is narrower than that of
    conventional mold. These issues hinder the popular use of rapid
    prototyping technique for making large injection mold.
    Although a great of attention has been paid to improve the
    performance of the cooling system, most of the published works are
    only feasible for simple plastic parts. One of the evidence is that all
    the examples used in various case studies are very simple.
    8
     Some of
    works
    3,6,7,12,14
     relied on 1-D or 2-D heat transfer analysis meanwhile
    the geometry of plastic parts are usually complex, and they need a
    3-D analysis. Moreover, sensitive analysis, finite element or
    boundary element coding for optimization of some specific cases
    are still academic and lack of generalization, so they are
    inconvenient to apply in reality. On the contrary, some of works
    8,9,15
     
    applied 3-D CAE tools to solve the cooling problem for some more
    complex parts. Yet, the method of reducing the cooling time and
    optimizing the configuration of conformal cooling channels of these
    studies were not adequate.
    This paper is intended as a contribution to solve this on-going
    problem by introducing U-shape milled groove conformal cooling
    channels fabricated by CNC milling machine instead of rapid prototyping method. This approach is suitable for medium-sized
    and large-sized molded part with free-form surface. The relation
    between the configuration of cooling channels and cycle averaged
    thermal behavior of the mold cavity are investigated thoroughly.
    The size, location, and layout of cooling channels for a quite
    complex molded part are optimized by the combination of an
    applicable analytical model based on the equivalent model,
    computer-aided 3-D heat transfer analysis, and effective
    optimization strategy. This approach would therefore offer a more
    feasible and practical way to design an optimal conformal cooling
    channel and to meet the requirement of reducing the cooling time
    and increasing molded part quality with less effort of plastic
    designers.
     
     
    2. U-shape milled groove conformal cooling channels
     
    Milled groove cooling channels in spiral form has been used for
    flat parts with round and circular shape in order to obtain better
    temperature control. This kind of cooling channels is more
    expensive to make comparing to straight-drilled one, but produces
    high-quality and distortion-free parts such as precision gears and
    compact discs.
    16
     Sun8
     proposed a modified milled groove method
    applied to medium free-form parts with two case studies of mouse
  1. 上一篇:反击式破碎机英文文献和中文翻译
  2. 下一篇:发动机缸体工艺英文文献和中文翻译
  1. 接头的形状对沥青塞接头...

  2. 开口端纺纱系统中的锥形...

  3. 旅客船运行时波浪形态的...

  4. 冷轧带钢的工业形状检测...

  5. 车身外表面变形校正方法英文文献和中文翻译

  6. 成形预测级进模冲压件多...

  7. 路几何线形和交通速度英文文献和中文翻译

  8. 十二层带中心支撑钢结构...

  9. java+mysql车辆管理系统的设计+源代码

  10. 大众媒体对公共政策制定的影响

  11. 酸性水汽提装置总汽提塔设计+CAD图纸

  12. 中考体育项目与体育教学合理结合的研究

  13. 杂拟谷盗体内共生菌沃尔...

  14. 当代大学生慈善意识研究+文献综述

  15. 河岸冲刷和泥沙淤积的监测国内外研究现状

  16. 电站锅炉暖风器设计任务书

  17. 乳业同业并购式全产业链...

  

About

751论文网手机版...

主页:http://www.751com.cn

关闭返回