| 摘要 |
<P>PROBLEM TO BE SOLVED: To form a die cast product having little casting defect by pouring clean molten metal containing no solidified layer, oxidized film, etc., and little gas content into a cavity for product. <P>SOLUTION: A die casting molding method is is disclosed for performing casting by pouring the molten metal 30 injected from an injection sleeve 15 by shifting of an injection plunger 16 into the cavity for product in a die 6 through a runner 9 in the die 6. The die 6 is provided with a branching weir 17 at the circumference near the inlet 9a of the runner, a capturing cavity 18 around the branching weir 17 and an air-vent 20 communicating with the catching cavity 18. The molten metal 30 is branched into an impurity layer 30a and a clean layer 30b at the outer peripheral part by bumping the molten metal 30 injected from the injection sleeve 15 against the branching weir 17. The branched clean layer 30b is poured into the cavity for product through the runner 9, and the branched impurity layer 30a at the outer peripheral part is captured into the capturing cavity 18. Then, the gas collected in the capturing cavity 18 is exhausted externally through the air-vent 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
