Method and apparatus for injection molding of semi-solid metals
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B22D-017/00
B22D-023/00
B22D-027/08
출원번호
US-0259625
(1994-06-14)
발명자
/ 주소
Wang Kuo K. (Ithaca NY) Peng Hsuan (Ithaca NY) Wang Nan (Ithaca NY) Wang Shau-Poh (Ithaca NY)
출원인 / 주소
Cornell Research Foundation, Inc. (Ithaca NY 02)
인용정보
피인용 횟수 :
63인용 특허 :
0
초록▼
A new method and apparatus for the injection molding of semi-solid materials (SSM). In this process (called Rheomolding), a superheated liquid metal is cooled into the semi-solid state in the barrel of a special vertical injection-molding machine, with the growing dendrites of the solid phase being
A new method and apparatus for the injection molding of semi-solid materials (SSM). In this process (called Rheomolding), a superheated liquid metal is cooled into the semi-solid state in the barrel of a special vertical injection-molding machine, with the growing dendrites of the solid phase being broken into small and nearly spherical particles by the shearing force generated by the screw and barrel. Compared with the superheated liquid metal, SSM has lower temperature, lower shrinkage and a more stable flow pattern. Therefore, the rheomolding process can produce net-shape metal or metal-matrix-composite parts continuously at lower cost.
대표청구항▼
An injection molding machine for casting metals in semi-solid form, comprising: a) a hopper for liquid metal, having means for maintaining the metal at a temperature above the liquidus temperature and a fluid outlet for liquid metal at the lower end thereof, b) a vertical shearing/cooling section co
An injection molding machine for casting metals in semi-solid form, comprising: a) a hopper for liquid metal, having means for maintaining the metal at a temperature above the liquidus temperature and a fluid outlet for liquid metal at the lower end thereof, b) a vertical shearing/cooling section comprising i) a solid tubular barrel having lower and upper ends, an axial cavity in the center, and a fluid input near the upper end thereof for inlet of liquid metal connected to the fluid outlet of the hopper, ii) a screw located in the axial cavity of the barrel, having a shaft extending out of the upper end of the barrel, having a length less than the length of the barrel, and fitting in the axial cavity with only a small gap between the screw flights and the walls of the axial cavity, capable of rotational motion and axial motion from a first position in which the lower end of the screw is near the lower end of the barrel, to a second position in which the upper end of the screw is near the upper end of the barrel, iii) a nozzle for mating with a mold, sealably located in the lower end of the axial cavity, having a fluid passage from the axial cavity to the lower end of the nozzle which mates with the mold, iv) seal means for preventing liquid metal flow while permitting the screw shaft to rotate and move up and down, located around the screw shaft on the upper end of the axial cavity, v) temperature control means for maintaining the barrel at a temperature below the liquidus temperature of the metal, c) means for rotating the screw, connected to the screw shaft, d) means for moving the screw lengthwise from its first position to its second position, connected to the screw shaft, the machine operating such that the liquid metal is fed into the shearing/cooling section while the screw is in its first, lower position and is sheared by the rotating screw while being cooled below its liquidus temperature under the control of the temperature control means and forming a semi-solid material; the rotating screw is moved to its second, upper position; and the screw is quickly moved to its first, lower position, ejecting the semi-solid material through the nozzle into the mold. The method of injection molding semi-solid metals, comprising the steps of: a) starting with metal above its liquidus temperature, b) shearing the metal with a rotating, vertical, non-compression screw agitator, c) cooling the metal while it is being sheared, to a semi-solid state below its liquidus temperature, d) raising the screw agitator, causing the semi-solid metal to accumulate below the screw agitator, e) quickly lowering the screw agitator to inject the accumulated semi-solid metal into a mold.
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