電子ビームによる紡糸ノズルの製作

概要

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Many attempts of electron beam machining have been performed in the field of production engineering. The manufactures of spinning nozzles which are most outstanding examples are described. To produce these nozzles, the electron beam machine consisting of tetrode electron gun, electrical beam alignment system, reducing lens and octo-pole deflection system with astigmatic corrector was used for the experiments. The beam spot size of about 10μm in diameter at 80 kV and 800μA and the power density ranging 8 × 105 to 2 × 106 W/cm2 are obtained. The spinning nozzles for hollow shaped fibres, which consist of 10 to 23 holes or more complicated nozzles can be easily drilled by an electron beam by programing controlled system, and machining time is few seconds. The drilled materials of these nozzles are stainless steel and glass plate (manufactured by Vycol Glass work Co.) with thickness 0.5mm and 2mm respectively. It was found to be the most distinguished features that the ratio of diameter to depth in the drilled holes can be reached to 1 : 100, and the interior surfaces of hole and slit are very smooth by microscopic observations. Spinning nozzle manufacture by electron beam instruments has great value for producing synthetic fibres.
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