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首页> 外文期刊>International Journal of Production Research >Thermal conditions in stereolithography injection mould tooling and their use for polyether-ether-ketone moulding
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Thermal conditions in stereolithography injection mould tooling and their use for polyether-ether-ketone moulding

机译：立体光刻注模工具中的热条件及其在聚醚醚酮成型中的用途

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The use of stereolithography (SL) as a rapid tooling technique for injection moulding provides a low cost and quick alternative to hard tooling methods when producing a small quantity of parts. However, previous work has shown that different characteristics are developed by crystalline plastic parts produced from SL moulds and those produced from conventional tooling methods. Differing characteristics means that the parts are not truly the same as those that would be produced by hard tooling and highlights a disadvantage to SL tooling. Such differences are due to the cooling rate experienced by the part. Parts produced from SL moulds are cooled more slowly than those from metal tools as a result of the differing thermal conductivity of the mould material itself. This work concerned establishing the extent of the difference in the heat transfer characteristics. The different cooling rates were demonstrated by real-time data acquisition. The results illustrated the very different thermal history imparted on the moulding that is likely to be the cause of characteristic differences in the parts. The work then describes how the thermal conditions experienced in SL moulds can be used to an advantage. A case study details the use of SL moulds for the injection moulding of polyether-ether-ketone, which has high process parameter demands. The results of the case study have shown that not only is the SL rapid tooling method capable of producing a low volume of polyether-ether-ketone parts, but also under conditions that would not be possible using a metal mould. The thermal characteristics of SL moulds allowed fully crystalline polyether-ether-ketone parts to be produced with the mould at room temperature; the equivalent steel mould would require a pre-moulding temperature of about 200℃ and much higher injection pressures and speeds.
机译：在生产少量零件时，将立体光刻（SL）用作注塑的快速加工技术可提供低成本且快速替代硬加工方法的功能。但是，以前的工作表明，由SL模具生产的结晶塑料零件和由常规加工方法生产的结晶塑料零件具有不同的特性。不同的特性意味着零件与通过硬模具生产的零件并不完全相同，这凸显了SL模具的缺点。这种差异是由于零件所经历的冷却速度所致。由于模具材料本身的热导率不同，因此从SL模具生产的零件的冷却速度比从金属工具冷却的零件的冷却速度慢。这项工作涉及确定传热特性差异的程度。实时数据采集证明了不同的冷却速度。结果表明，模制件上的热历史差异很大，这很可能是零件特性差异的原因。然后，工作描述了如何利用SL模具中经历的热条件来发挥优势。案例研究详细介绍了将SL模具用于聚醚醚酮的注塑成型，这对工艺参数有很高的要求。案例研究的结果表明，SL快速加工方法不仅能够生产少量的聚醚醚酮部件，而且在使用金属模具无法生产的条件下也是如此。 SL模具的热特性允许在室温下用模具生产出全结晶聚醚-醚-酮零件。等效的钢模需要200℃左右的预成型温度，以及更高的注射压力和速度。

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