著者

市川 慎平 竹花 范平 植松 義量 小林 捷雄

出版者

独立行政法人 海上技術安全研究所

雑誌

船舶技術研究所報告 (ISSN:0495775X)

巻号頁・発行日

vol.1, no.3, pp.207-234, 1964-07-30

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It is generally well-known that gas cutting speed can be remarkably increased dy using a divergent-type gas cuttig nozzle instead of a normal straight-type one. In order to the peculiar curvature of its inner shape, however, it is considered to be very difficult to produce a divergent nozzle by simple machining. Therefore, the authors have newly developed two kinds of methods to produce a divergent gas cutting nozzle; one is an electrolytic-forming and another is a swaging. In this paper, the detail of the methods and the processes related to the massproduction and the results of many investigations carried on the cutting performance of the divergent nozzles made by these two methods are described. The following conclusions are summarized. A divergent nozzle made by the electrolytic-forming method shows many advantages; such as a better accuracy, higher cutting capabilities and a lower production-loss, while by the swaging somewhat inferior only in an accuracy compared to the former. However, it is confirmed that the both methods have an extremely higher economies and an easier production, and that, moreover, the gas cutting performance of the divergent nozzles made by these methods is increased 15% in cutting speed and 8% in cutting thickness of plate compared to straight nozzles.