Mold designing method and mold

Abstract

In a mold designing, a deformation amount of a casting from a solidification start time to a cooling end time may be obtained by deformation analysis software, and a deformation amount of a mold from a pouring time to the solidification start time may be obtained by deformation analysis software. When a cavity shape is designed based on the obtained deformation amounts of the mold and the casting, the precision of a near net shape may be further improved by reflecting the mold cavity shape at the solidification start time to the mold design, and a lack in dimension of a casting product after the casting process may be prevented.

1 . A mold designing method of designing a cavity shape of a mold that casts a casting by pouring molten metal thereinto based on a numerical analysis, comprising:
 numerically analyzing a deformation of a mold caused by heat from a molten metal pouring time to a solidification start time so as to obtain a mold cavity shape change amount from the pouring time to the solidification start time;   numerically analyzing a deformation of the casting caused when the casting is solidified and cooled from the solidification start time to a cooling end time so as to obtain a casting shape change amount from the solidification start time to the cooling end time; and   designing the mold cavity shape based on the mold cavity shape change amount and the casting shape change amount.   
     
     
         2 . The mold designing method according to  claim 1 ,
 wherein a length dimension or an outer diameter dimension of the casting is 200 mm or more.   
     
     
         3 . The mold designing method according to  claim 1 ,
 wherein the casting includes a large-diameter portion and a small-diameter portion in the axial direction.   
     
     
         4 . The mold designing method according to  claim 1 ,
 wherein temperature dependency of a physical property value of a mold material used in the numerical analysis of the deformation of the mold caused by the heat is considered.   
     
     
         5 . The mold designing method according to  claim 1 ,
 wherein the mold cavity shape change amount is obtained by adding the deformation of the mold caused by a static pressure of the molten metal poured into the mold.   
     
     
         6 . A mold that casts a casting by pouring molten metal thereinto,
 wherein a cavity shape is designed by the mold designing method according to  claim 1 .