• Title/Summary/Keyword: laser cutting

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Process Optimization for the Laser Cutting of Cold Rolled STS Sheet (냉연 스테인리스강판의 레이저 절단 특성)

  • 이기호;김기철
    • Journal of Welding and Joining
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    • v.14 no.5
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    • pp.59-68
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    • 1996
  • This study was aimed to characterize the laser cutting process for the cold rolled stainless steel sheet. The principal process parameters of the cutting process were applied to both the continuous wave form and the pulsed wave form for the laser output mode. The laser-oxygen cutting process and the laser-nitrogen cutting process were also considered to characterize the quality and efficiency of the cutting process. The laser-oxygen cutting process revealed the better productivity than the laser-nitrogen cutting process, since the laser energy and the exothermic oxidation energy exerted on the laser-oxygen cutting process simultaneously during the entire cutting process. However, the straightness of the cutting section, which was considered as the most important factors, was inferior to that of the laser-nitrogen cutting process due to the formation of chromum oxide on the cutting surface. Frequency and duration of the pulsed wave form act as the main factors for the better quality, When the frequency increased from 100 Hz to 200 Hz and the duty increased from 20% to 40%, the quality factors such as the height of dross and the surface roughness were improved remarkably. The increase in the frequency from 200 Hz to 300 Hz, on the other hand, revealed the less effective in the cutting quality.

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Underwater Laser Cutting of Thick Stainless Steel in Various Cutting Directions for Application to Nuclear Decommissioning

  • Shin, Jae Sung;Oh, Seong Y.;Park, Seung-Kyu;Kim, Taek-Soo;Park, Hyunmin;Lee, Jonghwan
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.19 no.3
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    • pp.279-287
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    • 2021
  • For application in nuclear decommissioning, underwater laser cutting studies were conducted on thick stainless-steel plates for various cutting directions using a 6 kW fiber laser. For cutting along the horizontal direction with horizontal laser irradiation, the maximum cutting speed was 110 mm·min-1 for a 48 mm thick stainless-steel plate. For cutting along the vertical direction with horizontal laser irradiation, a maximum speed of 120 mm·min-1 was obtained for the same thickness, which confirmed that the cutting performance was similar but slightly better. Moreover, when cutting with vertically downward laser irradiation, the maximum cutting speed was 120 mm·min-1 for a plate of the same thickness. Thus, the cutting performance for vertical irradiation was nearly identical to that for horizontal irradiation. In conclusion, it was possible to cut thick stainless-steel plates regardless of the laser irradiation and cutting directions, although the assist gas rose up due to buoyancy. These observations are expected to benefit laser cutting procedures during the actual dismantling of nuclear facilities.

A Study on Cutting Characteristics Evaluation of High Speed Feeing Type Laser Cutting M/C (고속 이송 방식 Laser Cutting M/C의 절단성 평가에 관한 연구)

  • 이춘만;임상헌
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.1820-1823
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    • 2003
  • A high speed feeding type laser cutting M/C is developed for precise cutting of sheet metal. This paper has been carried out to obtain cutting characteristics and optimal cutting conditions of the developed high speed feeding type laser cutting M/C by a design of experiments. Cutting speed. laser power. laser duty and gas pressure are control factors for the surface roughness. The major factors affecting the surface roughness and the optimum cutting conditions are studied with minimum experiments using Taguchi method.

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Effects of Laser Parameters and Workpiece Conditions on Cutting Characteristics of Solid Wood and Wood-based Panel(I) - Cutting Depths and Kerf Widths - (레이저변수(變數)와 피삭재조건(被削材條件)이 목재(木材) 및 목질(木質)보드의 절삭특성(切削特性)에 미치는 영향(影響)(I) - 절삭(切削)깊이와 절삭폭(切削幅) -)

  • Sim, Jae-Hyeon;Jung, Hee-Suk
    • Journal of the Korean Wood Science and Technology
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    • v.25 no.4
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    • pp.75-91
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    • 1997
  • Laser cutting tests were conducted to investigate the laser cutting characteristics of solid woods such as 25mm-thick white oak(Quercus acutissima) and maple(Acer mono), and wood-based panels such as 15mm-thick medium density fiberboard and particleboard. Test variables were laser power, cutting speed, grain direction, and moisture content. Cutting depths, kerf widths and the maximum cutting speed were measured. Cutting depths were increased as focus of laser beam was moving from above the workpiece to on the surface of workpiece, and also to below the workpiece. Kerf widths were decreased as focus of laser beam was moving from above the workpiece to on the surface of workpiece, but were increased as focus of laser beam was moving from on the surface of workpiece to below the workpiece. Minimum kerf widths were obtained when focus of laser beam was positioned on the surface of workpiece. Cutting depths and kerf widths were decreased with increase in moisture content, and cutting depths and kerf widths of more dense white oak were smaller than those of maple. And also cutting depths and kerf widths of particleboard were smaller than those of medium density fiberboard.

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A study on the optimal cutting condition of a high speed feeding type laser cutting machine by using Taguchi method

  • Lim Sang-Heon;Lee Choon-Man;Chung Won Jee
    • International Journal of Precision Engineering and Manufacturing
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    • v.7 no.1
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    • pp.18-23
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    • 2006
  • Cutting by a high speed laser cutting machine is one of most effective technologies to improve productivity. This paper has presented the cutting characteristics and optimal cutting conditions in a high speed feeding type laser cutting machine by using Tacuchi method in the design of experiment. An L9(34) orthogonal array is adopted to study the effect of adjustment parameters. The adjustment parameters consist of cutting speed, laser power, laser output duty and assistant gas pressure. The surface roughness of sheet metal is regarded as a quality feature. Analysis of variance is performed in order to evaluate the effect of adjustment parameters on the quality feature of laser cutting process.

Cutting Motion Simulator for Nutating Head Type S-axis CNC Laser Cutting Machine (Nutating 헤드 타입 5축 CNC 레이저 절단기용 동작 시뮬레이터)

  • Kang, Jae-Gwan
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.34 no.3
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    • pp.35-40
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    • 2011
  • 5-axis laser cutting has great advantages when it is applied to three dimensional machining requiring high cutting quality. For developing 5-axis CNC laser cutting systems, however, many problems such as rotating a laser head or a working table, 5-axis servo-control mechanism, tool path generation and post-processing, and collision avoidance between a laser head and a work-piece should be solved. In this paper, we deal with developing a motion simulator for 5-axis laser cutting machine with a nutating cutting head whose rotational axis is in an inclined plane. Two essential modules such as post-processor and cutting motion simulator was developed based on a commercial 3D CAD of UG-NX. The developed system was applied to three dimensional cutting products and showed the validity of the developed methods.

A Study on the Optimal Cutting Condition of High Speed Feeding Type Laser Cutting Machine by Taguchi Method (다구찌 방법을 이용한 고속 이송방식 레이저 절단기의 최적 절단 조건에 관한 연구)

  • 임상헌;박동근;이춘만
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.6
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    • pp.77-83
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    • 2004
  • Cutting by a high speed laser cutting machine is one of most effective technologies to improve productivity. This paper has studied to obtain the cutting characteristics and optimal cutting conditions in a high speed feeding type laser cutting machine by Tacuchi method in design of experiments. A Lf(34) orthogonal array is adopted to study the effect of adjustment parameter. The adjustment parameters consist of cutting speed, laser power, laser output duty and assistant gas pressure. And the quality feature is selected as surface roughness of sheet metal. Variance analysis is performed in order to evaluate the effect of adjustment parameters on the quality feature of laser cutting process.

Influence of process parameters on the kerfwidth for the case of laser cutting of CPS 1N sheet using high power CW Nd:YAG laser (고출력 연속파형 Nd:YAG 레이저를 이용한 CSP 1N 냉연강판 절단시 공정변수의 절단폭에 미치는 영향)

  • Kim Min-Su;Lee Sang-Hoon;Park Hyung-Jun;Yoo Young-Tae;Ahn Dong-Gyu
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.7 s.172
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    • pp.19-26
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    • 2005
  • The objective of this study is to investigate the influence of process parameters, such as power of laser, cutting speed of laser and material thickness, on the practical cutting region and the kerfwidth fer the case of cutting of CSP IN sheet using high power Nd:YAC laser in continuous wave(CW) mode. In order to obtain the practical cutting region and the relationship between process parameters on the kerfwidth, several laser cutting experiments are carried out. The effective heat input is introduced to consider the influence of power and cutting speed of laser on the kerfwidth together. From the results of experiments, the allowable cutting region and the relationship between the effective heat input and kerfwidth fur the case of cutting of CSP 1N sheet using high power CW Nd:YAG laser have been obtained to improve the dimensionalaccuracyofthecutarea.

Effects of Laser Parameters and Workpiece Conditions on Cutting Characteristics of Solid Wood and Wood-based Panel(II) - Specific Cutting Energy and Surface Qualities - (레이저변수(變數)와 피삭재조건(被削材條件)이 목재(木材) 및 목질(木質)보드의 절삭특성(切削特性)에 미치는 영향(影響)(II) - 비절삭(比切削)에너지와 절삭면(切削面)의 품질(品質) -)

  • Sim, Jae-Hyeon;Jung, Hee-Suk
    • Journal of the Korean Wood Science and Technology
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    • v.26 no.1
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    • pp.38-50
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    • 1998
  • Laser cutting tests were conducted to investigate the laser cutting characteristics of solid woods such as 25mm-thick white oak(Quercus acutissima) and maple(Acer mono), and wood-based panels such as 15mm-thick medium density fiberboard and particleboard. Test variables were laser power, cutting speed, grain direction, and moisture content. Specific cutting energy was measured and the qualities of cut surface were estimated in constant laser power. Specific cutting energy of white oak was larger than that of maple, and specific cutting energy of medium density fiberboard was smaller than that of particleboard. For both white oak and maple, specific cutting energy of green wood was smaller than that of air-dried wood because weight loss of moisture evaporation in green wood was larger than that in air-dried wood. In laser-cut surface, wood cells were not deformed and damaged, but in circular saw-cut surface fibers were pushed out and cut, and wood cells were deformed severely. However, mechanical surface roughness of saw-cut surface was smoother than that of laser-cut surface because of the existence of undeformed cell cavity in laser-cut surface.

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High Quality Plasma Cutting and Laser Cutting Technology (고품질 플라즈마 절단 및 레이저 절단기술)

  • Kim, Hwan Tae;Kil, Sang Cheol
    • Journal of Welding and Joining
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    • v.35 no.2
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    • pp.30-34
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    • 2017
  • The trend of the plasma cutting and laser cutting technology of metal alloys including high strength steel, aluminum alloys for the welding structures has been studied. The high-precision plasma systems offer a denser, higher energy arc that in effect produces a sharper cutting tool and high quality cutting products. The high-quality fiber laser systems with compact design and easy set-up make it ideal for cutting in the pipeline or steel structre manufacturing. This paper covers the scientometric analysis of the high efficient cutting technology which are based on the published research works in the 'plasma and laser', and 'cutting technology' obtained from Web of Science, and deals with the details of the background data of the plasma cutting and laser cutting technology.