小口径ノズルプラズマによる非晶質箔の熱切断

概要

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Fundamental characteristics of the cutting is studied. The foil is made of steel based amorphous alloy (B : 13%, Si : 9%, Fe : bal.) with 28 μm thickness and 25 mm width. An XY table bearing the foil specimen moves at a constant speed toward X-direction under the plasma jet. Two weights placed on the both sides of cutting line fix the specimen. The nozzle diameter is O.15mm and O.3mm.The plasma gas is argon. Nitric acid diluted by ethyl alcohol etches the cut specimen to show heat affected region. Three types of dross are observed ; straight line, straight line spotted by spheres and rugged shape. The size of heat affected region ranges from 150 to 664 μm on the plasma torch side of the specimen and from 156 to 823 μm on the opposite side. Use of smaller arc current, greater plasma gas pressure, greater table speed and smaller nozzle-foil distance reduces the size. Dimensional analysis of four controllable parameters gives several combinations of the parameters. Under the assumption that those combinations are linearly combined, multiple linear regression by least square method shows that the size of heat affected region is well described by the linear combination of H and SQRT (I/(Pv)), where H, I, P and v are nozzle-foil distance, arc current, plasma gas pressure and table speed respectively.
公益社団法人精密工学会の論文
1992-07-05