Method of forming semi-solidified metal composition
AssigneeRheo-Technology, Ltd.
InventorsMitsuru Moritaka, Sadahiko Shinya, Katsuhiro Takebayashi, Seiro Yahata, Chisato Yoshida
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Abstract
When a semi-solidified metal composition is formed in a forging die assembly, it is formed under conditions satisfying particular mass fraction solid and flowing rate in the die and then held under a given pressure until the metal composition is completely solidified.
Claims6
In a method of forming a semi-solidified metal composition by die forging a semi-solidified metal composition as a starting material at a solid-liquid coexistent state under conditions that said starting material is filled in a filling region of a die assembly at a mass fraction solid of 0.2-0.8 at a time of starting said die forging and then held under a pressure of not less than 6 kg/mm.sup.2 until said starting material is completely solidified after the filling in said die assembly, an improvement wherein said starting material is flowed in said filling region at a flowing rate of not less than 3.5 m/sec during the filling.
A method of forming a semi-solidified metal composition by die forging a semi-solidified metal composition as a starting material at a solid-liquid coexistent state, said method comprising the steps of:
- a) preparing a semi-solidified metal composition at a solid-liquid coexistent temperature region;
- b) cooling and solidifying said semi-solidified metal composition to form an ingot having a granular structure;
- c) forming a starting material from said ingot;
- d) heating said starting material to a temperature corresponding to a mass fraction solid at the solid-liquid coexistent temperature region of 0.2-0.8;
- e) filling said heated starting material in a die assembly having a filling region;
- and
- f) die forging said heated starting material by operating a ram at a speed sufficient to create a starting material flowing rate in the filling region of said die of at least 3.5 m/sec.
Dependencies are inferred from the claim text.