High Speed Laser Micro Drilling for Aerospace Applications

Stephen, Andreas; Schrauf, G.; Mehrafsun, Salar; Vollertsen, Frank

doi:10.1016/j.procir.2014.08.002

Cited by 23 publications

(4 citation statements)

References 8 publications

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“…As today's fiber optic lasers offer the possibility to drill fast even at high qualities [54,55], the laser machine used for drilling was equipped with a fiber optic laser source with a maximum peak pulse power of 20 kW.…”

Section: Drilling Of Experimental Samplesmentioning

confidence: 99%

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

2021

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Particularly in the aerospace industry and its applications, recast layers and microcracks in base materials are considered to be undesirable side effects of the laser beam machining process, and can have a significant influence on the resulting material behavior and its properties. The paper deals with the evaluation of the affected areas of the Inconel 718 nickel-base superalloy after its drilling by a laser beam. In addition, measurements and analyses of the mechanical properties were performed to investigate how these material properties were affected. It is supposed that the mechanical properties of the base material will be negatively affected by this accompanying machining process phenomenon. As a verification method of the final mechanical properties of the material, static uniaxial tension tests were performed on experimental flat shape samples made of the same material (Inconel 718) and three different thicknesses (0.5/1.0/1.6 mm) which best represented the practical needs of aerospace sheet metal applications. There was one hole that was drilled with an angle of under 70° in the middle of the sample length. Additionally, there were several sets of samples for each material thickness that were drilled by both conventional and nonconventional methods to emphasize the effect of the recast layer on the base material. In total, 192 samples were evaluated within the experiment. Moreover, different tensile testing temperatures (room as 23 °C and elevated as 550 °C) were determined for all the circumstances of the individual experiments to simulate real operation load material behavior. As a result, the dependencies between the amount of the recast layer and the length of the microcracks observed after the material was machined by laser beam, and the decrease in the mechanical properties of the base material, were determined.

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Section: Drilling Of Experimental Samplesmentioning

confidence: 99%

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

2021

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“…HAZ is the area of work material that does not melt during laser machining but has an effect on microstructures. The depth of the HAZ zone during laser machining is one of the important metallurgical performance characteristics [25] so, one of the main problems in percussion laser drilling is the deformation due to temperature caused by laser [26]. Due to focused beam energy on the surface of a workpiece during laser drilling, melting and evaporation take place.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Deformation Patterns Due to the High-Speed Micro-Laser Drilling Process for Ti-6Al-4V Used in Aerospace Applications

Çelebi

Tosun

Önçağ³

2020

Academic Platform Journal of Engineering and Science

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Hybrid Laminar Flow Control (HLFC) is used in the aviation industry to reduce fuel consumption of civil jet aircrafts. Small holes are required at the leading edges of the aircraft wings and tail planes to reduce friction caused by boundary layer suction. Much research has been made in the application of drilling small holes to Ti-6Al-4V alloys. The most important of these investigations is that the thermal distortion cannot be controlled during the application of a large number of holes in huge areas and thus, it causes deformation as a result of thermal deterioration. When micro drilling is applied, some problems arise due to close proximity of drilled holes. The aim of this investigation is to evaluate the deformation due to the micro laser drilling process and develop an efficient set of certain laser parameters to minimize it. 50 W power pulsed Ytterbium fiber laser having a galvo scanner have been used during the process. The effects of increased waiting time, use of weight on both sides of the specimens and nitrogen cooling upon the deformation of the drilled samples have been investigated. Before and after the drilling process the samples have been scanned by a 6-axis arm CMM having an integrated 3D laser scanner. The deformation patterns have been obtained with the use of PC-DMIS software. As a result, as the waiting time is increased, less deformation has been observed in the samples. In addition, addition of nitrogen gas to the process has positively influenced the deformation minimization efforts.

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“…Aspect ratios greater than 50 have been produced with high quality, usually by employing helical or trepanning drilling [5][6][7]. In addition to high precision and aspect ratios, high-speed drilling and micro drilling are utilized, especially in aerospace applications [8]. Burr formation and elimination are also important issues, studied e.g., by Duan et al [9].…”

Section: Introductionmentioning

confidence: 99%

Comparison of Laser-Engraved Hole Properties between Cold-Rolled and Laser Additive Manufactured Stainless Steel Sheets

et al. 2017

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Laser drilling and laser engraving are common manufacturing processes that are found in many applications. With the continuous progress of additive manufacturing (3D printing), these processes can now be applied to the materials used in 3D printing. However, there is a lack of knowledge about how these new materials behave when processed or machined. In this study, sheets of 316L stainless steel produced by both the traditional cold rolling method and by powder bed fusion (PBF) were laser drilled by a nanosecond pulsed fiber laser. Results were then analyzed to find out whether there are measurable differences in laser processing parts that are produced by either PBF (3D printing) or traditional steel parts. Hole diameters, the widths of burn effects, material removal rates, and hole tapers were measured and compared. Additionally, differences in microstructures of the samples were also analyzed and compared. Results show negligible differences in terms of material processing efficiency. The only significant differences were that the PBF sample had a wider burn effect, and had some defects in the microstructure that were more closely analyzed. The defects were found to be shallow recesses in the material. Some of the defects were deep within the material, at the end and start points of the laser lines, and some were close to the surfaces of the sample.

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High Speed Laser Micro Drilling for Aerospace Applications

Cited by 23 publications

References 8 publications

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

An Investigation of the Deformation Patterns Due to the High-Speed Micro-Laser Drilling Process for Ti-6Al-4V Used in Aerospace Applications

Comparison of Laser-Engraved Hole Properties between Cold-Rolled and Laser Additive Manufactured Stainless Steel Sheets

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