Experimental Study of Back Wall Dross and Surface Roughness in Fiber Laser Microcutting of 316L Miniature Tubes

García-López, Erika; Medrano-Tellez, Alexis G.; Ibarra-Medina, Juansethi; Siller, Héctor R.; Rodríguez, Ciro A.

doi:10.3390/mi9010004

Cited by 8 publications

(8 citation statements)

References 31 publications

(27 reference statements)

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“…Separate experimental designs were applied to each tube diameter, with two replicates for pulse overlapping and pulse energy factors (see Table 4 ), while argon gas assisted the process (P A = 4.1 bar). These process parameters were selected according to a previous experiment with laser cutting of miniature stainless steel tubes, with the same order of magnitude in wall thickness [ 33 ]. Considering that magnesium alloys have a higher thermal conductivity (~3 times) than stainless steel materials, the process parameters were selected in the same range as the cited work.…”

Section: Methodsmentioning

confidence: 99%

Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy

et al. 2018

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Magnesium alloys are of increasing interest in the medical industry due to their biodegradability properties and better mechanical properties as compared to biodegradable polymers. Fiber laser cutting of AZ31 magnesium alloy tubes was carried out to study the effect of cutting conditions on wall surface roughness and back-wall dross. During the experiments, an argon gas chamber was adapted in order to avoid material reactivity with oxygen and thus better control the part quality. A surface response methodology was applied to identify the significance of pulse overlapping and pulse energy. Our results indicate minimum values of surface roughness (Ra < 0.7 μm) when the spot overlapping is higher than 50%. A back-wall dross range of 0.24% to 0.94% was established. In addition, a reduction in back-wall dross accumulations was obtained after blowing away the dross particles from inside the tube using an argon gas jet, reaching values of 0.21%. Laser cutting experimental models show a quadratic model for back-wall dross related with the interaction of the pulse energy, and a linear model dependent on pulse overlapping factor for surface roughness.

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Section: Methodsmentioning

confidence: 99%

Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy

et al. 2018

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“…Kathuria et al [48] applied the short pulse Nd-YAG laser to fabricate a stent with a diameter of 2.0 mm and a length of 20 mm and found that the cutting surface quality can be improved by controlling the heat-affected zone and dross removal process. Erika et al [49] investigated the formation mechanism of back wall dross and surface roughness during fiber laser micro-cutting of 316 L miniature tubes and fabricated the stents with a surface roughness of less than 1 µm and dross deposits of less than 3.5%. Bear et al [50] designed and fabricated a novel laser-activated shape memory polymer stent, and the deformation of the fabricated stents was calibrated in a water-filled artery model in vitro.…”

Section: Laser Cuttingmentioning

confidence: 99%

“…Laser cutting [44][45][46][47][48][49][50][51][52][53][54][55][56] Good quality High processing accuracy Heat-affected zone 3D printing [57][58][59][60][61][62][63][64] Personalized customization High material utilization Poor accuracy µEDM…”

Section: Difficult To Processingmentioning

confidence: 99%

“…At present, design optimization mainly focuses on the following aspects including bridge/link [25][26][27][28][29], representative volume element/representative unit cell [30][31][32][33][34], and patient-specific structure [35][36][37][38]. Then, the commonly used manufacturing technologies of vascular stents mainly include the braiding technique [39,40], micro-injection molding [41][42][43], laser cutting [44][45][46][47][48][49][50][51][52][53][54][55][56], and 3D printing [57][58][59][60][61][62][63][64]. Each processing method has its advantages and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

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A Review on Manufacturing and Post-Processing Technology of Vascular Stents

et al. 2022

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Percutaneous coronary intervention (PCI) with stent implantation is one of the most effective treatments for cardiovascular diseases (CVDs). However, there are still many complications after stent implantation. As a medical device with a complex structure and small size, the manufacture and post-processing technology greatly impact the mechanical and medical performances of stents. In this paper, the development history, material, manufacturing method, and post-processing technology of vascular stents are introduced. In particular, this paper focuses on the existing manufacturing technology and post-processing technology of vascular stents and the impact of these technologies on stent performance is described and discussed. Moreover, the future development of vascular stent manufacturing technology will be prospected and proposed.

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“…The authors concluded that the effect of scanning speed on the microgroove geometry was more critical compared to the laser pulses. García-López et al 6 focused on assessing process parameters' influence on average surface roughness (R a ) and back-wall dross during fiber laser micro-cutting of small SS tubes. The study revealed that the highest level of spot overlaps (60%-93%) reduced average surface roughness by a considerable amount.…”

Section: Introductionmentioning

confidence: 99%

A Study of Fiber Laser Micro-Grooving of 316L Stainless Steel at Different Temperatures

Sen¹,

Doloi

Bhattacharyya

2021

Journal of Micromanufacturing

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The present article deals with the generation of micro-grooves on 316L stainless steel (SS) by a nanosecond pulsed fiber laser system. Fabrication of micro-grooves on 316L SS has immensely contributed to the biomedical and automotive industries through improving the mechanical, lubrication, and corrosion resistance properties. In the present work, the considered process parameters are the preheating temperature (100°C and 200°C), along with the room temperature (24°C), cutting speed, sawing angle, pulse frequency, and laser power. The ranges of cutting speed and sawing angle are 0.1–1.1 mm s−1 and 0.1°–1°, respectively. Besides, pulse frequency and laser power vary from 55 kHz to 85 kHz and from 15 W to 45 W, respectively. The constant parameters are the pulse width of 99% and assist air pressure of 6 kgf cm−2. The variable parameters for the analysis are cut width and heat-affected zone (HAZ) width. The article aims to showcase a comprehensive study of fiber laser process parameters at different temperatures (preheated condition and room temperature) with variable sawing angles to produce better process control and bring about each considered process parameter’s critical value. The experimental results show that higher dimensions of cut width and HAZ width are observed at 200°C with the increment of sawing angle and laser power, compared to other temperatures. With the increment of cutting speed and laser power, the HAZ width tends to rise sharply. A significant drop in cut width and HAZ width dimensions is observed with the increment in pulse frequency for any temperature.

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Experimental Study of Back Wall Dross and Surface Roughness in Fiber Laser Microcutting of 316L Miniature Tubes

Cited by 8 publications

References 31 publications

Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy

Surface Finish and Back-Wall Dross Behavior during the Fiber Laser Cutting of AZ31 Magnesium Alloy

A Review on Manufacturing and Post-Processing Technology of Vascular Stents

A Study of Fiber Laser Micro-Grooving of 316L Stainless Steel at Different Temperatures

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