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신경회로망 및 반응표면분석법을 이용한 파우더 블라스팅시의 표면거칠기 및 재료제거량 예측
박동삼(Dong-Sam Park),유우식(Woo-Sik Yoo),김권흡(Quan-Qia Jin),성은제(Eun-Je Seong),한진용(Jin-Yong Han) 한국기계가공학회 2007 한국기계가공학회지 Vol.6 No.1
Powder blasting technique has been considered one of the most appropriate micro machining methods for hard and brittle materials, since the productivity is high and the heat layers caused by material removal are very thin. Recent development of special purposed parts, such as the parts for semiconductor processing, the parts for LCD, sensors for micro machine fabrication and so on, has been expanded. Thus, it is essential to develop powder blasting technologies for micromachining of hard and brittle materials such as glass, ceramics and so on. In this paper, the characteristics of powder blasted glass surface were tested under various blasting parameters. Finally, we proposed a predictive model for powder blasting process using the neural network and the response surface method. Detail analysis of the simulation results is carried out and the performance of two predictive models is compared.
Powder Blasting을 이용한 교차구멍의 내부 모서리 디버링
박동삼(Dong-Sam Park),한진용(Jin-Yong Han),성은제(Eun-Je Seong),한일용 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
Burr generation in intersection hole drilling causes serious problems. These burrs must be removed to make fluid flow smoothly, to improve fatigue life or to prevent injury. Despite the full or partial automation of FMC or FMS, deburring operations to obtain workpiece with fine surface quality are difficult to be automated since the generation and conditions of burr are not constant. This study focused on developing deburring technique for intersection hole in small solenoid valve parts. The successful performance was demonstrated by deburring experiment using the powder blasting.
파우더 플라스팅에 의한 Si₃N₄-hBN계 머시너블 세라믹스의 미세패턴 가공성 평가
박동삼(Dong Sam Park),조명우(Myeong Woo Cho),김동우(Dong Woo Kim),조원승(Won Seung Cho) 한국생산제조학회 2004 한국생산제조학회지 Vol.13 No.2
Sandblasting has recently been developed into a powder blasting technique for brittle materials. In this study, the machinability of Si₃N₄-hBN based machinable ceramics are evaluated for micro - pattern making processes using powder blasting. Material properties of the developed machinable ceramics according to the variation of h-BN contents give a good machinability to the ceramics. The effect of scanning times, the size of patterns and variation of BN contents on the erosion depth of samples without mask and samples with different mask patterns in powder blasting of Si₃N₄-hBN ceramics are investigated. The Parameters are the impact angle of 90°, the scanning times of nozzle up to 40, and the stand-off distances of l00㎜. The widths of masked pattern are 0.l㎜, 0.5㎜ and 1㎜. The powder used is Alumina particles, WA#600. and the blasting pressure of powder is 0.2㎫ Through required experiments, the results are investigated and analyzed. As the results, the machinability of the developed ceramics increases as the BN contents in the ceramics.
파우더 블라스팅에 의한 OELD용 유리캡의 가공 및 크랙 특성
박동삼(Dong Sam Park),강대규(Dae Kyu Kang),김정근(Jeong Keun Kim),성은제(Enu Je Seong),한진용(Jin Yong Han) 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.5
The old technique of sandblasting which has been used for paint of scale removing, deburring and glass decorating has recently been developed into a powder blasting technique for brittle materials, capable of producing micro structures larger than 100㎛. Recently, this technique is applied to fabrication of the glass cap for OELD packaging. But, micro crack is generated on the blasted glass, which cause to decrease fracture strength. In this paper, we investigated the effect of blasting parameters on surface characteristics, surface shape and fracture strength of the powder blasted glass surface.
황동의 Micro Groove 가공시 절삭칩과 표면거칠기
박동삼(Dong Sam Park),윤대진(Dae Jin Yun),장호수(Ho Su Jang) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Importance of micro pattern such as micro V or R groove which have been used in LGP pattern and optical instrument parts is growing larger recently. This study deals with creation of ultra-precision micro V or R grooves in 6:4 brass using non-rotational single crystal diamond tool and 3-axis micro stages. Chatter generation, chip formation and surface roughness were investigated for the analysis of machinability of 6:4 brass.