| 摘要 |
<p>PURPOSE:To mold easily and efficiently a self-curing casting mold by storing the sand mixed with a binder and curing agent in a hopper and sucking said sand through a release hole at the bottom plate of a hopper into a molding flask under the reduced pressure below said plate while leveling off the height of the sand by an impeller. CONSTITUTION:The aperture of the molding flask 8 placed on a pattern board 1 is hermetically closed by the bottom plate 11a of the hopper 9 lowered by the actuation of a cylinder 10, thereby forming a hollow chamber C. On the other hand, the sand supplied from a hopper 31 and the binder and curing agent for molding the self-curing casting mold to be supplied respectively from conduits 33, 34 are added and mixed in a mixing vessel 23 provided with the impeller 26 and thereafter the mixture is supplied through the release port 28 into said hopper 9. The sand is stored in the hopper 9 while the height is leveled off by the impeller 22 attached to the vertical revolving shaft 21 of a motor 20. The inside of the hollow chamber C is then sucked and evacuated through the hollow chambers 2, 16 of the pattern plate 1 and the plate 11a by a vacuum pump 7 to suck and pack the sand in the hopper 9 into the chamber C; further the hopper 9 is lowered by the cylinder 10 to squeeze the sand if necessary. The packed sand is cured in this state and the self-curing type molding sand is thus obtd.</p> |
