US2014190233A1PendingUtilityA1

Metal mold for hot pressing

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Assignee: ISHII SHINJIPriority: Aug 29, 2011Filed: Aug 29, 2011Published: Jul 10, 2014
Est. expiryAug 29, 2031(~5.1 yrs left)· nominal 20-yr term from priority
Inventors:Shinji Ishii
B21D 37/01B21D 22/022B21D 22/208B21D 37/16
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Claims

Abstract

A metal mold for hot pressing according to the present invention includes a fixed mold and a movable mold disposed such that molding surfaces of the fixed mold and the movable mold face each other. The metal mold sandwiches a heated workpiece between the fixed mold and the movable mold to press the workpiece while, at the same time, cooling the workpiece by keeping the molding surfaces of the fixed mold and the movable mold in contact with surfaces of the workpiece. A layer formed by a shape-memory alloy is formed at least at a portion, on which fitting during pressing is tight, of the molding surface of the fixed mold. According to the metal mold for hot pressing of the present invention, formation of a gap between the metal mold and the workpiece is suppressed and uniform contact between the metal mold and the workpiece can be achieved.

Claims

exact text as granted — not AI-modified
1 . A metal mold for hot pressing comprising a fixed mold and a movable mold disposed such that molding surfaces of the fixed mold and the movable mold face each other, the metal mold sandwiching a heated workpiece between the fixed mold and the movable mold to press the workpiece while, at the same time, cooling the workpiece by keeping the molding surfaces of the fixed mold and the movable mold in contact with surfaces of the workpiece,
 wherein a layer formed by a shape-memory alloy is formed at least at a portion, on which fitting during pressing is tight, of the molding surface of the fixed mold.   
     
     
         2 . The metal mold for hot pressing according to  claim 1 , wherein
 a product shape of the workpiece has a hat-shaped section in a longitudinal direction and   the shape-memory alloy layer is formed at each of portions of the molding surface of the fixed mold, the portions corresponding to a flange face and a top face of the hat-shaped section of the product shape of the workpiece.   
     
     
         3 . The metal mold for hot pressing according to  claim 1 , wherein
 the shape-memory alloy layer formed on the molding surface of the fixed mold is formed by a superelastic alloy.   
     
     
         4 . The metal mold for hot pressing according to  claim 2 , wherein
 the shape-memory alloy layer formed on the molding surface of the fixed mold is formed by a superelastic alloy.

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