| 摘要 |
<p>In casting metal objects in casting cavities (2) in moulds (1), connectable to a pressurized mould-filling furnace (5) through a delivery tube (8) and a connector (9), the main novel feature is the use of an external riser (13) connected to and extending upwardly from the junction of said tube (8) and said connector (9), said riser (13) being used as a temporary reservoir in which the level of molten metal is regulated by controlling the gas pressure (in 7) in said furnace (5) in such a manner, that the filling head, defined as the difference in level between the metal in the casting cavities (2) and that in the external riser (13), is kept constant or made to vary in a desired manner, e.g. so as to cause the level in the cavities to ascend at a substantially constant rate. The invention makes it inter alia possible to produce high-quality aluminium castings in sand moulds, e.g. using automatic foundry equipment of the DISAMATIC® type.</p> |
