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Influence of Abrasive Water-Jet on Workpiece Geometry (Abrasive Water-Jet이 가공물의 형상에 미치는 영향)

  • 장현석;하만경;류인일;곽재섭;이상진;이기백
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.585-590
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    • 2002
  • Abrasive water-jet(AWJ) machining is a new cutting technology. The AWJ can cut various materials touch as metal, glass and stone. However, the AWJ machining makes troubles including kerf, rounding and side taper. In this study, we investigated the correlation between parameters of abrasive water-jet machining arid cutting characteristics. The machining parameter were the material thickness and the traverse speed. The experiment was conducted to cut the stainless steel(STS41) and the mild steel(SS41) specimens. The results of the experiment weirs presented as the relation between cutting conditions and trouble of a dimension error, a conner error, an uncut width and a kerf.

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Effects of Traverse Speed on Dimensional Error in Abrasive Water-Jet (입자 워터 젯의 이송속도가 공작물의 치수정밀도에 미치는 영향)

  • 곽재섭;하만경
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.3
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    • pp.1-7
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    • 2004
  • Abrasive water-jet(AWJ) machining can cut various materials such as metal, glass and plastics. However, the AWJ machining has some troubles including kerf, rounding and side taper. In this study, we experimently investigated the correlation between the traverse speed of the abrasive water-jet and the dimensional error of the workpiece according to the thickness and the types of the material. The specimen was the stainless steel and the mild steel and the predetermined contour cutting was conducted. A comer radius error, an uncut width and a kerf were measured and evaluated.

Cutting Characteristics of Workpiece Using Abrasive Water-Jet Machining (Abrasive Water-Jet 가공에서 공작물의 절단특성)

  • 장현석;하만경;곽재섭;박후명;이상진;이기백
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.984-987
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    • 2002
  • Abrasive water-jet(AWJ) machining is a new cutting technology. The AWJ can cut various materials such as metal, glass and stone. However, the AWJ machining makes troubles including kerf, rounding and side taper. In this study, we investigated the correlation between parameters of abrasive water-jet machining and cutting characteristics. The machining parameters were the material thickness and the traverse speed. The experiment was conducted to cut the stainless steel(STS41) and the mild steel(SS41) specimens. The results of the experiment were presented as the relation between cutting conditions and troubles of a dimension error, a conner error, an uncut width and a kerf.

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Development of Recirculating Wick Hydroponic Techniques for Safe Seed Tuber Multiplication of Potatoe (심지 양액재배법에 의한 상위급 씨감자의 안정적 대량생산)

  • Kang Bong Kyoon;Kim Chan Woo
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.49 no.6
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    • pp.447-451
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    • 2004
  • This study was conducted to establish the proper techniques of the recirculating wick hydroponics for safe seed tuber proliferation of potatoes (Solanum tuberosum L. CV. Dejima). To achieve these, several intact tubers (5, 10 and 20 g) and cut seed-pieces (two or four) were treated in wick hydroponic system beds. A polystyrene box (31cm in width, 20cm in height, 51cm in length, and $0.031m^3$ in volume) was placed on a styrofoam hox. Eight wicks $(width\;1.5cm\;{\times}\;length\;40cm) $ were put into each polystyrene hox and the boxes were filled with perlite + peatmoss (1 : 2, v/v) medium. Top fresh weight per plant increased with increasing the tuber size from 10 to 30g/tuber. As the tuber size increases from 10 to 30 g/tuher in case of uncut tuber, the marketable tuber (>5g) production per plant increased from 83.8 to 141.8 g/plant and the marketable tuber (>5g) production per plant of cut tuber was slightly higher than that of uncut treatment. Total tuber yield ranged from 4.16 to $6.56kg/m^2$ and the percentage of seed tubers was greater than $97\%$ for all treatments. These results indicate that seed tuber should be cut to produce large tuber $(\geq10g)$ in the recirculating wick hydroponic system.