ガス切斷に関する研究(第 1 報) : 可視酸素氣流の長さと末廣ノズルについて

概要

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As the first step of the research on oxy-acetylene gas cutting, the authors measured the cutting speed under the same cutting pressure, thickness of plate and standard drag, using the controllable-speed gas cutting machine; fitted No. 2 blow-pipe with No. 1 nozzle (1mm dia.) and found the oxy-gas volume necessary to cut a meter length of the plates. Then the relation of the length of visible gas stream to cutting efficiency of blow-pipes was clarified and the tentative design and manufacture of a divergent nozzle with ρ the increasing ratio of cross-sectional area of nozzle was carried out and comparison made between cutting efficiency of this nozzle and that of a straight nozzle. It is concluded that the length of visible oxy-gas stream of a nozzle can be regarded as representative of cutting efficiency and gas cutting speed can be raised 10-15% with the divergent nozzle as compared with the straight one. Further, there is a critical cutting pressure for increase of cutting speed to the diameter of nozzle, the value for 1.0mm dia. being 5kg/(cm)^2.
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