Adjustable forming of thermoplastic composites for orthopaedic applications
Adjustable forming of thermoplastic composites for orthopaedic applications
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DOI：
10.1023/a:1008894930867
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发表时间：
1998-02
期刊：
影响因子：
--
通讯作者：
M. Hou;K. Friedrich
中科院分区：
文献类型：
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作者：
M. Hou;K. Friedrich
本研究的重点是开发一种特殊的热成型技术，用于制造具有复杂表面轮廓的连续纤维增强热塑性复合材料零件。特别是，修改了冲压成型工艺，以研究热塑性复合材料在骨科应用中的潜在制造优势。设计了一种设备，该设备允许热成型过程是全自动的，即冷的预固结层压板作为进料，在红外加热区中加热，然后转移到冷模具系统中，在那里冲压成型。模具的两半都是由金属框架中的许多小圆金属棒制成的。这种针床模具允许人们通过在弹簧固定棒上轻轻推动它来复制任何轮廓。然后可以通过将金属框架的侧板压在一起来调整这些杆的期望位置。为了防止复合材料上的任何压痕，即为了实现热变形复合材料部件的光滑表面，需要柔性橡胶垫来覆盖模具表面。实验结果表明，用该模具成型的CF/PP和GF/PP复合材料的表面轮廓较好地再现了马鞍形复杂模型试样的轮廓。该针床模具的独特性能在于它可以重复使用，并且它可以复制任何复杂的表面轮廓，例如骨表面，只需根据特殊表面要求调整棒的位置。© 1998年查普曼和霍尔
The present study was focused on the development of a special thermoforming technique for manufacturing of continuous fibre reinforced thermoplastic composite parts with complex surface contours. In particular, a stamp forming process was modified to investigate the potential manufacturing advantages of thermoplastic composites in orthopaedic applications. An apparatus was designed which allowed the thermoforming procedure to be fully automatic, i.e. a cold pre-consolidated laminate panel, as the feed material, was heated up in an infrared heating zone and then transferred into a cold mould system, where it was stamp formed. Both halves of the mould were made of many tiny round metal sticks in a metal frame. This needle-bed mould allowed one to copy any contour by pushing it slightly on spring fixed sticks. The desired position of these sticks could then be adjusted by forcing the side plates of the metal frame together. To prevent any press mark of stick-tops on the composite, i.e. to achieve smooth surfaces of the themoformed composite parts, flexible rubber pads were needed to cover the mould surfaces. Experimental results showed that the surface profile of CF/PP and GF/PP composites formed by the needle-bed mould reproduced fairly well the contour of a saddle shaped, complex model sample. Unique properties of this needle-bed mould are that it can be repeatedly used, and that it can copy any complex surface contours, for example a bone surface, by simply adjusting the stick positions according to the special surface requirements. © 1998 Chapman & Hall