Abstract
Radial distribution pattern of heat source can be supposed to be influenced not only on the kerf shape but also on the gouging characteristics, that is based on the previous our reports that are Report 1 and 2 of this series. And then, it was clarified that the heat source can be assumed to be exponentially decreasing type along the flow axis. Moreover, the authors have made the new simulation algorithm to estimate the kerf shape and gouging depth at various cutting conditions in the Report 3 of this series.
So, the relationships between the heat distribution pattern and the cutting characteristics were examined in the present study with the simulation program that was described in the Report 3.
Gaussian type, a truncated corn type and a near square type were selected for the radial heat distribution model of heat source in the calculation. The simulated results were verified with some experimental results with various sorts of working gas ; argon, argon-hydrogen, nitrogen and oxygen that are used to change the radial heat distribution pattern of heat source.
As a result, it was clarified that the radial heat distribution pattern remarkably influences the kerf shape and the relationship between cutting speed and gouging depth. The bevel angel of kerf was improved by using a heat source of near square distribution pattern. And then, in this case of heat source, the gouging depth (cutting depth) and cutting speed was in almost inverse proportion to each other. Moreover, it was made clear that the differences of cutting characteristics among various sorts of gas can be explained by the radial heat distribution pattern.
