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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.
박동삼(Dong Sam Park),서태일(Tae Il Seo) Korean Society for Precision Engineering 2004 한국정밀공학회지 Vol.21 No.6
The old technique of sandblasting which has been used for decoration of glass surface has recently been developed into a powder blasting technique for brittle materials such as glass, silicon and ceramics, capable of producing micro structures larger than 100μ m. In this study, we introduced oblique powder blasting, and investigated the effect of the impacting angle of particles, the scanning times and the stand-off distance on the surface roughness and the weight-loss rate of samples with no mask, and the wall profile and overetching of samples with different mask pattern in powder blasting of soda-lime glass. The varying parameters were the different impact angles between 50° and 90°, scanning times of nozzle up to 40 and the stand-off distances 70㎜ and 100㎜. The widths of mask pattern were 0.2㎜, 0.5㎜ and 1㎜. The powder was alumina sharp particles, WA #600. The mass flow rate of powder during the erosion test was fixed constant at 175g/min and the blasting pressure of powder at 0.2㎫.
Weld Strength of Longitudinal and Longitudinal-Torsional Mode Horns in Ultrasonic Metal Welding
박동삼(Dong Sam Park),김진범(Jin Bom Kim),서지원(Ji Won Seo) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.8
The ultrasonic metal welding technique has been widely used because of the need to weld different materials for meeting high quality performance requirements. The key part in this type of welding is the horn, which plays an important role in the weld quality. Longitudinal vibration has so far been the most popular vibration mode for ultrasonic horns, but the longitudinal mode coupled with torsional mode is gaining a lot of attention these days owing to its better performance compared to the pure longitudinal mode. Although there are many studies on the performance of these two mode horns, comparative studies based on the performance of these two modes, particularly in ultrasonic metal welding, are very rare. This study focuses on the welding performance comparison of these two horns with 20 kHz resonant frequency. Experimental results show that the performance of the longitudinal-torsional horn is better than that of the longitudinal horn in terms of welding strength.
미립분사가공을 이용한 유리 소재의 가속도 센서 구조물 성형
박동삼(Dong Sam Park),강대규(Dae Kyu Kang),김정근(Jeong Keun Kim) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.2
Acceleration sensors have widely been used in the various fields of industry. In recent years, micromechanical accelerometers have been developed and commercialized by the micromachining technique or MEMS technique. Typical structure of such sensors consist of a cantilever beam and a vibrating mass fabricated on Si wafers using etching. This study investigates the feasibility of powder blasting technique for micro fabrication of sensor structures made of the pyrex glass alternating the existing Si based acceleration sensor. First, as preliminary experiment, effect of blasting pressure, mass flow rate of abrasive and no. of nozzle scanning on erosion depth of pyrex and soda lime glass is studied. Then the optimal blasting conditions are chosen for pyrex sensor. Structure dimensions of designed glass sensor are 2.9㎜ and 0.7㎜ for the cantilever beam length and width and 1.7㎜ for the side of square mass. Mask material is from aluminium sheet of 0.5㎜ in thickness. Machining results showed that tolerance errors of basic dimensions of glass sensor ranged from 3㎛ in minimum to 20㎛ in maximum. This results imply the powder blasting can be applied for micromachining of glass acceleration sensors alternating the exiting Si based sensors.
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.
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.