薄肉平板アルミニウム合金砂型鋳物の湯流れに対する鋳型傾斜角度の影響

抄録

  The influence of mold tilt on aluminum alloy melt flow was studied using sand molds for aluminum thin-wall plate castings. The mold tilt was changed from ＋15.5° to －15.5° at six grades. Using a heat-resistant glass plate for the upper sand mold, we observed the flow patterns through the glass plate with a high speed video recorder at 200 flames per second.

  If the tilt was negative, the melt went straight up to the end, then flowed backward. When the tilt was positive, the melt flowed while keeping the horizontal line. Nevertheless, if the mold was horizontally held, the flow pattern was unstable as expected. This result completely agreed with those of the sand mold experiments. These results can be explained by and agree with the Weber number, namely, the ratio of the surface tension and inertia.