Experimental Study of Back Wall Dross and Surface Roughness in Fiber Laser Microcutting of 316L Miniature Tubes Page: 4
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Micromachines 2018, 9, 4
Figure 1. Experimental setup.
The experimental design was a two-level full factorial 25 with four central points and three
replications for each parameter combination. Separate experimental designs were applied for each tube
thickness and hardness condition. An analysis of variance (ANOVA) was performed to evaluate the
process parameter's significance for each kind of miniature tube. Table 5 depicts the five experimental
factors investigated, as well as their corresponding high and low levels. The experimental responses of
interest were average surface roughness and back wall dross percentage.
Average surface roughness was measured over the laser cut surface on the Y-Z plane with a
confocal microscope (Zeiss Model CSM 700, Carl Zeiss AG, Oberkochen, Germany) according to the
ISO 4288 standard. The measurement procedure consisted of obtaining a measurement on the cut
edge using a sample basic length of 0.8 mm and tracing an evaluation line of 4 mm. Back wall dross
percentage was assessed by measuring a total area of 1080 .m by 780 .m in the middle of the miniature
tube on the X-Y plane with a stereomicroscope (Zeiss Model Discovery V8, Carl Zeiss AG, Oberkochen,
Germany). The reference area for back wall dross measurement was selected based on the miniature
tube dimensions and laser trajectory in the cut geometry.
ImageJ software (National Institutes of Health, Bethesda, MD, USA) was used for the image
processing of the back-wall dross measurements. Back wall dross was measured as the percentage
of the area covered by adhered particles over the whole measured area using the "analyze particle"
command and particle diameter range of 16 .m to 100 .m. Figure 2 presents a drawing of (a) the laser
beam phenomena, (b) the cut geometry which consists of two separable pieces to measure the surface
roughness on the cut edge, and (c) the dross adhered at the back wall of the tube.
AISI316L tube Rotary unit
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García-López, Erika; Medrano-Tellez, Alexis G.; Ibarra-Medina, Juansethi R.; Siller, Héctor R. & Rodríguez, Ciro A. Experimental Study of Back Wall Dross and Surface Roughness in Fiber Laser Microcutting of 316L Miniature Tubes, article, December 26, 2017; Basel, Switzerland. (digital.library.unt.edu/ark:/67531/metadc1062077/m1/4/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Engineering.