When someone joins large structural components, the importance of the joining technology increases. Well-known joining processes such as welding and classic adhesive bonding reach their limits with respect to cycle times and tolerances. A new two-component polyurethane injection process based on the reaction in mold technology, offers an alternative and has the potential to reduce costs and compensate tolerances. The objective of this paper is to characterize and evaluate this process for potential applications so that it is possible to set the parameters as necessary. The example that was chosen for this research is the battery housing for electric vehicles. The advantage that this process does not only join the parts within seconds, but also will seal or fill long gaps if necessary, makes it particularly interesting for the industry. Classic adhesive technology applies the adhesive on one part, then takes the second part for the joining process, grouts the adhesive to a defined gap and afterwards, it still has to cure in a geometrically-defined tool. The PUR injection process fixes the two components in a tool with a defined gap and afterwards, injects the PUR that then reacts in the gap and joins the two parts within seconds. The adhesion and as well the rheology decreases with an increase in crosslinkings. These two parameters are therefore described relative to time and temperature. A steep increase in viscosity is detected after just a few seconds. With higher adherend temperatures the increase in viscosity appears earlier and steeper. The property for adhesion to the surface is decreasing the longer the PUR takes to hit the surface. These dependencies are described in this paper to develop a reproducible application process with a battery housing for electric vehicles as a case study.

中文翻译：

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用快速固化的两组分PUR系统进行结构组分的注射粘合

当有人连接大型结构部件时，连接技术的重要性增加。众所周知的焊接工艺（例如焊接和经典的粘接）在循环时间和公差方面达到了极限。一种基于模具技术中反应的新型双组分聚氨酯注射工艺，是一种替代选择，具有降低成本和补偿公差的潜力。本文的目的是表征和评估此过程的潜在应用，以便可以根据需要设置参数。本研究选择的示例是电动汽车的电池外壳。该工艺不仅可以在几秒钟内将零件连接起来，而且在必要时还会密封或填充较长的缝隙，这一优势使整个行业特别感兴趣。经典的胶粘技术将胶粘剂应用到一部分上，然后将第二部分用于连接过程，将胶粘剂灌浆到定义的间隙，然后，仍必须使用几何定义的工具进行固化。PUR注入过程将两个组件固定在具有确定间隙的工具中，然后注入PUR，然后在间隙中反应，然后在几秒钟内将两个零件连接起来。粘合性以及流变性随交联度的增加而降低。因此，相对于时间和温度描述了这两个参数。仅几秒钟后，粘度就急剧上升。随着较高的被粘物温度，粘度的增加出现得更早和更陡。PUR击打表面所需的时间越长，与表面的粘附性就会下降。