For the industrial repair of carbon fiber reinforced plastics (CFRP), scarfing is used to re-establish the load path. In the industry today, the state of the art removal of CFRP layers for a repair process is done mainly manually, leading to a time-consuming process. Therefore, an automation of this process is desirable. Today, vacuum suction blasting is used to pre-treat CFRP surfaces only for the superficial removal of impurities or the removal of the cover layer before bonding. With the common used blasting agents and nozzle geometries, the even removal of larger areas together with the fiber was not possible. This work shows that the technology of vacuum suction blasting was adapted to be used as an automated scarfing method. A combination of blasting parameters, especially the nozzle geometries together with a blasting agent were found to be able to remove CFRP layers precisely, detecting and correcting errors in-line with a line scanner-measuring unit. The presented method allows treating large-scale surfaces, scarfing the area one single layer at a time, increasing the removal rate in comparison to common blasting. With vacuum suction blasting the grinding dust emissions and process forces are low, post cleaning or further surface activation are not necessary and the removal results can directly be controlled. Challenges still exist with inaccurate removal due to interruptions in the blasting program and the generation of sharp edges for a stepped scarf.

中文翻译：

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通过粘合剂粘合自动去除碳纤维增强塑料层以进行修复

对于碳纤维增强塑料 (CFRP) 的工业修复，使用熔接来重新建立负载路径。在当今的行业中，用于修复过程的最先进的 CFRP 层去除主要是手动完成的，这导致了一个耗时的过程。因此，需要该过程的自动化。今天，真空抽吸喷砂仅用于对 CFRP 表面进行预处理，仅用于表面去除杂质或在粘合前去除覆盖层。使用常用的喷​​砂剂和喷嘴几何形状，不可能将更大的区域与纤维一起均匀去除。这项工作表明，真空抽吸爆破技术适用于作为一种自动清理方法。爆破参数组合，尤其是喷嘴几何形状与喷砂剂一起被发现能够精确地去除 CFRP 层，检测和纠正在线扫描仪测量单元中的错误。所提出的方法允许处理大面积表面，一次烧毁该区域一层，与普通爆破相比，提高了去除率。使用真空吸尘喷砂，研磨粉尘排放量和加工力都很低，不需要后期清洁或进一步的表面活化，并且可以直接控制去除结果。由于喷砂程序的中断和阶梯式围巾的锋利边缘的产生，仍然存在不准确去除的挑战。所提出的方法允许处理大面积表面，一次烧毁该区域一层，与普通爆破相比，提高了去除率。使用真空吸尘喷砂，研磨粉尘排放量和加工力都很低，不需要后期清洁或进一步的表面活化，并且可以直接控制去除结果。由于喷砂程序的中断和阶梯式围巾的锋利边缘的产生，仍然存在不准确去除的挑战。所提出的方法允许处理大面积表面，一次烧毁该区域一层，与普通爆破相比，提高了去除率。使用真空吸尘喷砂，研磨粉尘排放量和加工力都很低，不需要后期清洁或进一步的表面活化，并且可以直接控制去除结果。由于喷砂程序的中断和阶梯式围巾的锋利边缘的产生，仍然存在不准确去除的挑战。