Importance

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Abstract

A liquid metal (49) poured into a filling chamber (20) is influenced in this chamber by a lower piston (43) and an upper piston (18), which are mounted on a lower machine table (5) and an upper machine table (10) respectively, which tables (5 and 10 respectively) support a lower mold part (24) and an upper mold part (22) respectively. The filling chamber (20) is disposed in or at the lower mold part (24) and receives, as regards the poured-in amount of metal, the lower piston (43), which is adjustable as to its elevational level and can be adjusted to make the amount of metal reach a level somewhat below the mold cavity (51) between the mold parts (22, 24). The lower piston (43) has a larger diameter than the upper piston (18), which, in connection with the filling of the metal (41), is designed to be lowered to a central position in a guiding and feeding sleeve (19) in the upper mold part (22) and is retained in this position by an adjustable holding force. The lower piston (43) is subsequently designed to be pressed upwards and carry out the basic feeding into the mold cavity (51), counteracted up to the holding force by the upper piston (18), which is designed to, in the final phase of the basic feeding, be actuated by a larger force and be lifted somewhat to an upper holding position. The upper piston (18) is designed to, subsequent to the pressing movement of the lower piston (43), be activated and lowered to a lower position, the final pressing being done, subsequent to which the mold parts (22, 24) are designed to be opened up and to release the casting.

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First Claim