Automated Scarfing Process for Bonded Composite Repairs

Holzhüter, Dirk; Pototzky, Alexander; Hühne, Christian; Sinapius, Michael

doi:10.1007/978-3-642-29190-6_23

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…Currently, the certified removal process of fiber composite materials is often accomplished by manual grinding, which a worker has to carry out using a hand-held electrical or compressed air grinder (see Figure 2(a)). 7 The result depends then significantly on the level of knowledge and skill of the specialist staff (see Figure 2(b) and (c)).…”

Section: State Of the Artmentioning

confidence: 99%

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Brieskorn

Hintze

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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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.

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Section: State Of the Artmentioning

confidence: 99%

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Brieskorn

Hintze

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…In principle, it is possible to use a three-axis CNC machine [30]. With an integrated point laser sensor such a low-cost approach can even mill light curved structures by using ball nose cutters.…”

Section: Fabrication and Automation Of Reliable Bonded Composite Repamentioning

confidence: 99%

“…Even scarfing of complex geometries [28] becomes possible. There are several attempts to automate parts of the repair process [1,[29][30][31][32][33]. Most of them try to improve the scarfing process.…”

Section: Fabrication and Automation Of Reliable Bonded Composite Repamentioning

confidence: 99%

On the Fabrication and Automation of Reliable Bonded Composite Repairs

Holtmannspötter¹,

Czarnecki²,

Feucht³

et al. 2014

The Journal of Adhesion

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“…Automated removal methods are in approach to avoid the exhausting work for future repair operations [8, 9,10]. Scar ng with automated milling tools is an advanced approach developed for using it in the production line at Airbus [11].…”

Section: Automated Scarfing and Model Approachesmentioning

confidence: 99%

A Model Based Material Removal Simulation for Vacuum Suction Blasting of Composites

Brieskorn,

Hintze,

Rajanna

2023

Preprint

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Automated scarfing of carbon reinforced plastic (CFRP) layers is on its way to support commercial aircraft repair. In the industry, still, the manual scarfing operation is the qualified method. However, automated techniques as milling, laser removal and water jet cutting are in development and showed already good results. Another promising method is vacuum suction blasting (VSB) that was until now in particular used for the roughening of surfaces before adhesive bonding. To find the right adjustment for the parameters many experiments would be necessary accordingly to different CFRP parts with changing layer thicknesses. Simulation is a way to avoid this and to predict the removal result and the settings for the machining parameters. The VSB model uses a pixel method dividing the simulated part surface into smaller volume elements. Experimental data of VSB static blasting spots are the basic for the source matrix. The simulation feeds the matrix with the blasted depth and removal volume for different blasting times. A shifting of columns of the source matrix in the blasting movement direction simulates the movement of the blasting nozzle on the work piece surface. With this, the model can also predict the nozzle feed to remove exactly one complete layer for each scarfing step. In addition, it visualizes the seamless overlapping distance between two blasted tracks. With further adjustments, the model will predict the dynamic removal for varying input parameters such as negative pressure and nozzle distance or blasting agent. CLASSIFICATIO CODES MSC: 26B15, 65L12, 97G30, 15A24 JEL: C20

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Automated Scarfing Process for Bonded Composite Repairs

Cited by 9 publications

References 2 publications

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

Automated removal of carbon fiber reinforced plastic layers for the repair by adhesive bonding

On the Fabrication and Automation of Reliable Bonded Composite Repairs

A Model Based Material Removal Simulation for Vacuum Suction Blasting of Composites

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