Notch Formation Mechanism in Low Speed Oxygen Gas Cutting

概要

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Notching phenomenon, which is likely to occur in low cutting speed range, makes a troublesome barrier of cutting thicker plate, but its detail has not been clarified. Notch is often formed accidentally in practical cutting process, but it is an intrinsic unstable combustion reaction in very low cutting speed. The authors conducted some fundamental research on this matter to obtain detailed knowledges. Notching in low speed cutting is characterized by the periodic combustion and extinction at the front cutting wall, and the phenomena are greatly influenced by the flow characteristic of oxygen jet, behavior of thin molten layer at the front wall and thermal stability at the upper part of plate. The paper describes the detailed observation of phenomena and discusses the mechanisms of extinction and its propagation, re-combustion and self-sustaining condition of periodic phenomenon.
大阪大学の論文