• Title/Summary/Keyword: Laser cutting

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A Study on Cutting Mechanism and Heat Transfer Analysis in Laser Cutting Process (FDM을 이용한 레이저 절단 공정에서의 절단 메카니즘 및 절단폭의 해석)

  • 박준홍;한국찬;나석주
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.10
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    • pp.2418-2425
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    • 1993
  • A two-dimensional transient heat transfer model for reactive gas assisted laser cutting process with a moving Gaussian heat source is developed using a numerical finite difference technique. The kerf width, melting front shape and temperature distribution were calculated by using the boundary-fitted coordinate system to handle the ejection of workpiece material and heat input from reaction and evaporation. An analytical solution for cutting front movement was adopted and numerical simulation was performed to calculate the temperature distribution and melting front thickness. To calculate the moving velocity of cutting front, the normal distribution of the cutting gas velocity was used. The kerf width was revealed to be dependent on the cutting velocity, laser power and cutting gas velocity.

Development of 5-axis $CO_2$ Laser Cutting Machine and CAM (5축 CO2 레이저 컷팅 머신 및 CAM 시스템 개발)

  • Kang Jae-Gwan;Yeom S.B.;Kang B.S.;Lee H.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.245-246
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    • 2006
  • For developing 5-axis laser cutting systems, many problems such as rotating of laser head or table, 5-axis tool path generation and collision avoidance between laser head and product should be solved. In this paper, a five-axis laser cutting machine with table swivel and rotary type configuration is developed. The five axes (X,Y,Z,A,B) are controlled and interfaced to PC via MMC board. Two kinds of CAM S/W such as commercial 5-axis CAM S/W(Euclid) and UG-API are engaged to generate NC code for the developed 5-axis laser cutting machine.

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Femto-Second Laser Glass Cutting for Flat Panel Display (펨토초 레이저를 이용한 평판 디스플레이 유리기판 절단 연구)

  • Kim, Kwang-Ryul
    • Korean Journal of Materials Research
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    • v.18 no.5
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    • pp.247-252
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    • 2008
  • A laser glass cutting system using a femto-second laser was evaluated for Flat Panel Display (FPD) glass. A theoretical analysis of the ablation threshold and depth is described using an explicit analytic form. Experiments for clean and deep grooves were performed using a 3W femto-second laser, and the relationships between the input energy and the scribing depth as well as the threshold energy are presented. Mechanical breaking after the scribing process was carried out and the results are compared with a theoretical method. It was found that a two-sided LCD panel glass can be cut clearly using the laser cutting method. The methodology was found to be very effective as a mass-production cutting system.

A Study on Laser Assisted Machining for Silicon Nitride Ceramics (III) - Variation of the Main Cutting Force and Life of Cutting Tool by LAM of SSN and HIPSN - (질화규소 세라믹의 레이저 예열선삭에 관한 연구 (III) - SSN 및 HIPSN의 예열선삭시 절삭력 및 공구수명의 특성 -)

  • Kim, Jong-Do;Lee, Su-Jin;Kang, Tae-Young;Suh, Jeong;Lee, Jae-Hoon
    • Journal of Welding and Joining
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    • v.28 no.6
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    • pp.35-39
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    • 2010
  • Generally, ceramic material is very difficult to machine due to high strength and hardness. However, ceramic material can be machined at high temperature by plastic flow as metallic material due to the deterioration of the grain boundary glassy phase. Recently, a new method was developed to execute cutting process with CBN cutting tool by local heating of surface with laser. There are various parameters in LAM because it is a complex process with laser treatment and machining. During laser assisted machining, high power results in reducing of cutting force and increasing tool life, but excessive power brings oxidation of the surface. The effect of laser power, feed rate, cutting depth and etc. were investigated on the life of cutting tool. Chips were observed to find out suitable machining conditions. Chips of SSN had more flow-types than HIPSN. It means SSN is easier to machining. The life of cutting tool was increased with increasing laser power and decreasing feed rate and cutting depth.

Fabrication and Chracteristics of Cutting Cell with Various Laser Conditions (다양한 레이저 조건에 따른 컷팅셀 제작 및 특성 분석)

  • Park, Jeong Eun;Kim, Dong Sik;Choi, Won Seok;Jang, Jae Joon;Lim, Dong gun
    • Journal of the Korean Solar Energy Society
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    • v.39 no.3
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    • pp.9-17
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    • 2019
  • Laser cutting cell of solar cells can achieve high voltage and efficiency through more array than conventional 6 inch cell compared to same area. In this study, we fabricated c-Si cutting cell with various lasers and laser conditions such as power, speed, and number of times. In the case of picosecond laser, excellent surface characteristics were obtained due to small surface defects and low thermal damage at the output of 20W and the speed of 100 mm/s. However, it is not possible to fabricate a cutting cell having good characteristics due to nonuniform cutting inside the wafer when the processing for forming a cutting cell is not sufficiently performed. For nanosecond lasers, the best wafer characteristics were obtained for fabrication of excellent cutting cells at a frequency of 500 kHz and a laser speed of 100 mm/s. However, the nanosecond laser has not been processed sufficiently in the condition of a number of times. As a result, it was confirmed that the wafer thickness was cut by $63{\mu}m$ of the cell thickness of $170{\mu}m$ in the condition of five times of laser process. It was found that more than 30% of the wafer thickness had to be processed to fabricate the cutting cell. After cutting the 6-inch cell having the voltage of 0.65 V, we obtained the voltage of about 0.63 V.

A Study on Changes of Drape Shapes and Physical Properties by Applying Laser-Cutting Technique on Neoprene Materials (네오프렌 소재의 레이저 커팅기법 적용에 따른 물성 및 드레이프 형상 변화 연구)

  • Han, Yoojung;Kim, Jongjun
    • Journal of Fashion Business
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    • v.19 no.4
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    • pp.109-119
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    • 2015
  • A wide variety of fashion materials focus on good drape property and softness. Among the recently emerging materials, Neoprene that consists of laminated knit on both sides of foamed neoprene sheet seeks a unique appearance that is considerably deviated from the current flow. Diverse processing methods for the newly released material heighten the value in function and beauty among trends of fashion materials by enhancing the appearance, touch and material property. Laser-cutting technique is one of the processing methods that is consistently used in the textile area. This study aimed to find the basic materials for applicability of laser-cutting technique to clothing goods after consideration of the changes in material property and drape shape, and to furthermore enforce different pattern conditions to Neoprene material, one of the newly attractive materials in the fashion area. In this study, we applied laser-cutting technique to Neoprene material sample under different conditions of pattern appearance, size and distance, based on current evaluation and theoretical background of Neoprene material, fashion trend and laser-cutting technique. Drape property can improve and the drape direction could also be controlled by a wide variety of laser-cutting techniques applied to Neoprene materials that have uniquely different appearances from most other textiles. This technique could be applied to the design for diversification of Neoprene clothing goods in the future.

Influence of Process Parameters on Characteristics of the Cut Surface for the Case of Cutting of CSP IN Sheet Using High Power CW Nd:YAG Laser (고출력 CW Nd:YAG 레이저를 이용한 CSP 1N 박판재 절단시 공정변수의 절단표면특성에 미치는 영향)

  • 안동규;김민수;이상훈;유영태;박형준
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.10a
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    • pp.286-291
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    • 2004
  • The objective of this research work is to investigate the influence of process parameters, such as power of laser, travel speed of laser and material thickness, on roughness and striation of the cut surface for the case of cutting of CSP 1N sheet using high power Nd:YAG laser with continuous wave(CW). In order to find the practical cutting region and the relationship between process parameters on the roughness and the striation, several laser cutting experiments are carried out. From the results of experiments, the allowable cutting region and an optimal cutting speed for each cutting condition have been obtained to improve the quality of the cut surface. In addition, it has been shown that the surface roughness is related to the number of striation and depth of valley of the cut surface.

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Processing Evaluations of the Eagle Glass Cutting Using Pico-second Laser (피코초 레이저를 이용한 Eagle Glass 절단 시 가공성 평가)

  • Lee, Sang Kyun;Lee, Young Gon;Kim, Jae Do
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.4
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    • pp.403-408
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    • 2013
  • In this paper, the characteristics of ablation processing of the eagle glass by pico-second laser are investigated. The laser ablation is used to process micro forms on materials. The ablation causes little thermal effect and little burr on the surface of eagle glass. In order to examine the characteristics of panic cracks, experiments are conducted under various cutting conditions such as a frequency of 600 kHz, laser powers, scan speeds and number of scan(NS). To minimize the panic cracks, the specimens are heated at $30^{\circ}C$, $45^{\circ}C$, and $60^{\circ}C$ for ten minutes respectively and then they are broken by hands. Laser powers, NS and scan speeds have an effect on glass cutting results. The ablation depths increase with an increase in the laser power and NS whereas the panic cracks decrease with an increase in scan speed. The high temperature on processed specimens reduces the panic cracks and makes good results of laser cutting. The optimal condition for eagle glass laser cutting is found to be at 30 W of laser power, 3 mm/s of scan speed and 500 of NS, respectively.

A Study on the Development of High Speed Feeding Type Laser Cutting M/C (초고속 이송방식 Laser Cutting M/C 개발에 관한 연구)

  • 이춘만;임상헌
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.405-408
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    • 2002
  • A high speed feeding type laser cutting UC is developed for the precise cutting of sheet metal. The M/C is a flying optics type one with specified functions of movability and strength in order to increase workability. The gantry frame should be moved with a certain velocity within a relatively short time for the proper cutting of object materials. The gantry is actuated by rack and pinion. In this paper, modal and structural analysis for a laser culling M/C, is carried out in development of the machine The machine is modeled by placing proper shell and solid finite elements and fictitious mass properties to represent the real one.

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Integrated Automation System of Pattern Design and $CO_2$ Laser Cutting for Diving Suits (잠수복 패턴 자동 설계 및 $CO_2$ 레이저 절단을 위한 통합 시스템 개발)

  • 윤세봉;강병수;강재관;김여숙
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.409-412
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    • 2004
  • In this paper, an integrated automation system of pattern design and $CO_2$ laser cutting for diving suits is presented. Pattern design includes grading which creates a full-size range from a base pattern. Tool path for laser cutting from the patterns is generated in G-code format. $CO_2$ Laser cutting machine is developed to help cut the patterns with accuracy and speed. Aluminum profiles, ball screws, and stepping motors are engaged into the machine as frame structure, transfer unit, and driving devices respectively. The developed system is tested in dry suit cutting, convincing it can be readily introduced in driving suits manufacturing with respect to cost and efficiency.

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