Method for Predicting and Preventing Shrinkage Cavity of Iron Casting

Abstract

A method for predicting and preventing occurrence of shrinkage cavity in an iron casting of any of various shapes or in each part of an iron casting precisely prior to casting. The shape of an iron casting is approximated entirely or partially to a rectangular parallelepiped or a cube, to the sum of the two long sides is divided by the short side to determine a shape coefficient, and occurrence of shrinkage cavity is predicted by determining whether the value exceeds a predetermined value (determination coefficient) or not.

1 . A method for predicting shrinkage cavity in an iron casting, the method comprising:
 determining a shape coefficient which is a value obtained by dividing a sum of two long sides by a remaining short side from a shape of a casting product; and   confirming whether the shape coefficient is not more than 8 or not to predict occurrence of the shrinkage cavity.   
   
   
       2 . A method for predicting shrinkage cavity in an iron casting, the method comprising:
 determining a shape coefficient of each of closed elliptical loops in a solidification distribution chart obtained from a temperature distribution or a solidification time distribution in a solidification of a casting product; and   confirming whether or not the shape coefficient is 8 or more to predict occurrence of the shrinkage cavity in each of the closed elliptical loops.   
   
   
       3 . The method for predicting shrinkage cavity according to  claim 2 , wherein the size of the elliptical loop is measured on a screen using the solidification distribution chart obtained from the temperature distribution or the solidification time distribution due to a solidification simulation, thereby to calculate the shape coefficient. 
   
   
       4 . The method for predicting shrinkage cavity according to  claim 2 , wherein the shape coefficient is calculated from the number in X, Y and Z directions of elements constituting the elliptical loops divided by mesh cutting by use of the solidification distribution chart obtained from the temperature distribution or the solidification time distribution due to a solidification simulation. 
   
   
       5 . A method for predicting shrinkage cavity in an iron casting, the method comprising:
 dividing a product using a chiller or a feeder head or using the chiller and the feeder head together when the shape coefficient is more than 8 to set the shape coefficient to 8 or less.   
   
   
       6 . The method for predicting and preventing shrinkage cavity according to,  claim 1  wherein the shape coefficient of whether the shrinkage cavity occurs or not is determined by a component of the casting, a property of a mold and a cast position. 
   
   
       7 . The method for predicting and preventing shrinkage cavity according to  claim 2  wherein the shape coefficient of whether the shrinkage cavity occurs or not is determined by a component of the casting, a property of a mold and a cast position. 
   
   
       8 . The method for predicting and preventing shrinkage cavity according to  claim 3  wherein the shape coefficient of whether the shrinkage cavity occurs or not is determined by a component of the casting, a property of a mold and a cast position. 
   
   
       9 . The method for predicting and preventing shrinkage cavity according to  claim 4  wherein the shape coefficient of whether the shrinkage cavity occurs or not is determined by a component of the casting, a property of a mold and a cast position. 
   
   
       10 . The method for predicting and preventing shrinkage cavity according to  claim 5  wherein the shape coefficient of whether the shrinkage cavity occurs or not is determined by a component of the casting, a property of a mold and a cast position.