Laser cutting and drilling with zero conicity

Martin, Paul-Etienne; Estival, Sébastien; Dijoux, Mathieu; Laygue, Pierre; Kupisiewicz, Axel; Braunschweig, Robert

doi:10.1117/12.2253432

Cited by 1 publication

(1 citation statement)

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“…The similar hole diameters of the top and bottom side coincide well with the measured small taper angles shown in Figure 10 e. This result regarding small taper angle is very important for application to the SPR for dissimilar CFRP/metal joints. In an effort to reduce the taper angle, precision machining was developed and the effect of the top-hat beam was investigated [ 41 , 42 ]. Those methods might be not suitable for millimeter-scale machining of CFRP materials due to thermal effects and low processing time.…”

Section: Resultsmentioning

confidence: 99%

Green Picosecond Laser Machining of Thermoset and Thermoplastic Carbon Fiber Reinforced Polymers

et al. 2021

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There has been an increase in demand for the development of lightweight and high-strength materials for applications in the transportation industry. Carbon fiber reinforced polymer (CFRP) is known as one of the most promising materials owing to its high strength-to-weight ratio. To apply CFRP in the automotive industry, various machining technologies have been reported because it is difficult to machine. Among these technologies, picosecond laser beam-induced machining has attracted great interest because it provides negligible heat transfer and can avoid tool wear. In this work, we conducted and compared machining of 2.15 mm-thick thermoset and 1.85 mm-thick thermoplastic CFRPs by using a green picosecond laser. The optimized experimental conditions for drilling with a diameter of 7 mm led to a small taper angle (average ~ 3.5°). The tensile strength of the laser-drilled specimens was evaluated, and the average value was 570 MPa. Our study indicates that green picosecond laser processing should be considered as a promising option for the machining of CFRP with a small taper angle.

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Section: Resultsmentioning

confidence: 99%