Patent: Casting mold for metal sheet
Time：2020-12-09 Hits：889
A method is mainly used which casts an amorphous alloy specimen by rapidly drawing the molten metal into the mold cavity by using negative pressure made by suction and by solidifying the molten metal by transferring heat to a main mold body having high thermal conductivity before crystallization of metal, and a casting mold used for the method is mainly provided. The main mold body of the mold is made of a material such as copper having high thermal conductivity, and particularly, the main mold body is configured such that a cooling fluid circulates inside or around the main mold body, and as a result, the molten metal, which is drawn into and thus fills the mold cavity, is rapidly cooled and solidified before crystallization thereof, and formed as amorphous metal. The present invention has made a casting mold, of which the mold cavity has a small thickness and a large area, in order to use the differential pressure type casting mold to manufacture an amorphous alloy in the form of a sheet. The casting mold according to the present invention includes: a support portion at an upper side on which molten metal is disposed or a solid metal is placed and melted; a mold cavity at a lower side in which the metal sheet is formed as the molten metal is drawn from the support portion while filling the mold cavity and cooled; and a passageway through which the molten metal is drawn into the mold cavity from the support portion, in which the mold cavity includes a first surface at the upper side which communicates with the passageway, and a second surface at the lower side which faces the first surface, a plurality of suction portions for drawing the molten metal are formed in the second surface and extended downward from the second surface, the suction portions are connected to a vacuum source and configured to draw the molten metal by suctioning air from the mold cavity, and a blocking member, which is in contact with the second surface or the suction portions to prevent a leakage of the molten metal and allow an air flow, is disposed on the suction portions in the mold cavity. The present invention has considered a method of changing a flow direction of molten metal while the molten metal is drawn and introduced into the mold cavity and fills the mold cavity, thereby enabling the molten metal to fill the mold cavity while uniformly flowing in the entire mold cavity. The object of the present invention is to provide a mold for casting a metal sheet which may be used not only to manufacture an amorphous alloy but also to manufacture a metal product that requires a process of rapidly cooling molten metal, and may be configured by adopting a basic configuration of a differential pressure type casting mold in the related art without changing main structures of a casting mold in the related art and using an apparatus that requires precise control and has a complicated configuration.