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Full movie description for : Decide to dive into the worlds of the young and to discover one night with the lover of his dreams.The present invention relates generally to casting methods and, more particularly, to a method for producing cast irons from aluminum powders, particularly micro-alloyed iron powders.
Casting is a commonly used method for forming metal products from liquid metal or metal powder. The process usually involves the use of a mold that defines a cavity having the desired shape and size for the product. The mold and liquid metal are generally brought to a state of uniform temperature and then pressure is applied to the mold and metal. The temperature and pressure are then released, and the metal is cooled and solidified to form the cast product.
Most cast irons are produced from molds of a general size and shape. It is usually desirable to cast cast irons into smaller molds, such as those used to form small springs, gears, and other parts. In order to produce cast iron parts with a close tolerance, such small parts are usually produced from small (i.e., less than 5 cm long) molds. Unfortunately, the small sizes of the molds limit the ability of the mold to withstand the high pressures (on the order of approximately 1200 MPa to 1400 MPa) applied during the casting operation. Thus, the use of small molds results in less tolerance than desired, and conventional methods of producing small cast parts from molds suffer from various deficiencies. For example, small metal parts produced by conventional methods may not be completely uniform in size, since individual cast pieces have different geometrical configurations. In addition, the small pieces may not have the same uniformity in heat treatment or other surface treatments as would be desired for a finished product.
There are several conventional methods for casting parts from molds. One method uses a mold with relatively small, generally tubular cavities that are located in the mold walls. The mold is first heated and then molten metal is poured into the mold to fill the cavities. The molten metal is then allowed to cool in the mold to form the desired cast product. This method suffers from a number of disadvantages. First, the cavities are narrow and have a non-uniform wall thickness. The unevenness of the mold wall thickness is caused by the displacement of the molten metal as it fills the mold cavity. The displacement of the molten metal
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