ガス切断面の研究

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書誌事項

タイトル別名
  • A Study on the Aspect of Gas Cutting Surface

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説明

Through a series of experiment of gas cutting under various cutting conditions, we found the following relation about drag line density, i, e., number n of drag lines for each 10mm cutting length : n=n_0(V×10^<-2> cosθ)^<m>, where no is numerical constant peculiar to range of cutting speed V mm/min, and m is independent to V. 0 is inclination of cutting oxygen jet to steel plate surface. Other factors, that is, plate thickness, pressure, flow and velocity of cutting oxygen, kind and flow of preheating gas, nozzle distance, size and type of tip are nearly independent of n. Similarly, distance between top edge and folds or discontinuities of cut surface h, continued and parallel to top edge, varied by V as following experimental formula, h=h_0(V×10^<-2>)^<-1>, where h_0 is a numerical constant peculiar to velocity or quantities of cutting oxygen jet and of nozzle. Roughness of cut surface increases slightly according to V, but it will not be over 50μ at practical maximum cutting velocity, if any mechanical vibration transmitted to the nozzle tip. The slag flow through a cut groove has great influence on the growth mechanism of drag line. This slag flow is considered to be a pulsatory stream with accurate period (if the cutting conditions are constant), which has been explained by analogy of model experiment to be forced movement of a viscous fluid under a high speed oxygen blast acting on the liquid surface.

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