基于感应加热的聚醚醚酮注射成型工艺研究

Research on technology of injection molding of polyether ether ketone based on induction heating

为提高聚醚醚酮制品的成型质量和性能,创新性地将电磁感应加热方式引入聚醚醚酮注射成型工艺中。首先,建立了模具感应加热的仿真模型,仿真得到加热后的温度分布以及相关的加热参数。然后,开展了模具感应加热和油加热的对比实验研究,油加热存在较大的温度耗散,感应加热根据模具初始温度的不同,仅需15~65 s即可将模具温度加热至聚醚醚酮的加工窗口。最后,对比了两种加热方式下聚醚醚酮制品的表面质量和力学性能。结果表明,相比于油加热,感应加热使聚醚醚酮制品的表面粗糙度降低9.5%~27.3%,拉伸性能提升8%以上,弯曲性能提升23%以上。

To improve the molding quality and properties of polyether ether ketone(PEEK)products,electromagnetic induction heating was innovatively introduced into the injection molding process of PEEK.Firstly,the mold induction heating model was established,and the temperature distribution after heating and related heating parameters were obtained by simulation.Then,induction heating and oil heating comparative experiments were carried out.There is a large temperature dissipation in oil heating,and induction heating only takes 15-65 s to heat the mold temperature to the processing window of PEEK at different initial mold temperatures.Finally,the surface quali⁃ties and mechanical properties of PEEK samples prepared by injection molding under two heating methods were compared.The results show that compared with oil heating,after induction heating,the surface roughness of PEEK products is reduced by 9.5%-27.3%,and the tensile properties and flexural properties are improved by more than 8%and 23%,respectively.