In the present work, a hot-stamping system for carbon fiber reinforced thermoplastic (CFRTP) plates based on electrical resistance heating was developed, where CFRTP consisted of polyphenylene and polyacrylonitrile. With the hot-stamping process, a simple hat-shaped sample was made. The heating rate and maximum sample temperature varied depending on the electrical resistance of the CFRTP plate. Moreover, the contact conditions between the electrodes and the CFRTP plate also affected the sample temperature owing to their influence on the electrical resistance, which was determined by the amount of exposed carbon fiber (CF) on the sample surface. Temperature measurements performed using samples with various amounts of exposed CF (20%–95% CF) revealed that approximately 65% CF afforded the highest sample temperature and fastest heating rate. The CFRTP plate underwent non-uniform heating, especially during the early stages, e.g. less than 10 s. Sample heating to 150℃ resulted in permanent deformation of the hat-shaped CFRTP samples with less springback, whereas heating to higher temperatures above the melting point led to meandering of the samples. In contrast, CFRTP samples subjected to hot-stamping at lower temperatures, such as 110℃, exhibited rough surfaces. In addition to the sample temperature, the formability of CFRTP during hot-stamping was affected by the holding time. When hot-stamping was performed without a holding time, even at high temperatures of 150℃ and above, low-quality samples with dented surfaces and irregular sample thickness were obtained. The results of this study indicate that a temperature of 150℃ and a holding time of 10 s are optimal for fabricating high-quality hot-stamped CFRTP with smooth surfaces and uniform thickness.

中文翻译：

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基于电阻加热的碳纤维增强热塑性板材热冲压技术

在目前的工作中，开发了一种基于电阻加热的碳纤维增强热塑性塑料 (CFRTP) 板的热冲压系统，其中 CFRTP 由聚苯和聚丙烯腈组成。通过热冲压工艺，制作了一个简单的帽形样品。加热速率和最高样品温度取决于 CFRTP 板的电阻。此外，电极和 CFRTP 板之间的接触条件也会影响样品温度，因为它们会影响电阻，电阻由样品表面暴露的碳纤维 (CF) 的量决定。使用具有不同暴露 CF (20%–95% CF) 的样品进行的温度测量表明，大约 65% CF 提供了最高的样品温度和最快的加热速率。CFRTP 板经历了不均匀的加热，尤其是在早期阶段，例如不到 10 秒。样品加热至 150℃ 导致帽形 CFRTP 样品发生永久变形，回弹较小，而加热至高于熔点的较高温度导致样品曲折。相比之下，CFRTP 样品在较低温度（如 110℃）下进行热冲压，表面粗糙。除了样品温度外，CFRTP 在热冲压过程中的成型性还受到保温时间的影响。在没有保温时间的情况下进行热冲压时，即使在150℃及以上的高温下，也会得到表面凹陷和样品厚度不规则的低质量样品。