High rigidity, high damping capcity cast iron

Abstract

A high rigidity, high damping capacity cast iron, which is a cast iron containing 3 to 7% of Al, and produced by heating at 280 to 630° C. after casting, and then cooling.

What is claimed is: 
     
         1 . A method of producing a high rigidity, high damping capacity cast iron, comprising:
 casting a cast iron comprising 3 to 7 mass % of Al;   heating the cast iron at a temperature falling within a range of 280 to 630° C.; and   cooling the cast iron.   
     
     
         2 . The method according to  claim 1 , wherein the cast iron comprises 3 to 7 mass % of Al, 0.25 to 1.0 mass % of Mn, 0.04 mass % or less of P, 0.03 mass % or less of S, and the balance of Fe and inevitable impurities. 
     
     
         3 . The method according to  claim 1 , wherein the temperature falls within a range of 360 to 580° C. 
     
     
         4 . A method of producing a high rigidity, high damping capacity cast iron, comprising:
 casting a cast iron comprising 3 to 7 mass % of Al and 0.03 to 0.20 mass % of Sn;   heating the cast iron at a temperature falling within a range of 280 to 630° C.; and   cooling the cast iron.   
     
     
         5 . The method according to  claim 4 , wherein the cast iron comprises 3 to 7 mass % of Al, 0.25 to 1.0 mass % of Mn, 0.04 mass % or less of P, 0.03 mass % or less of S, 0.03 to 0.20 mass % of Sn, and the balance of Fe and inevitable impurities. 
     
     
         6 . The method according to  claim 4 , wherein the temperature falls within a range of 360 to 580° C. 
     
     
         7 . A method of producing a high rigidity, high damping capacity cast iron, comprising:
 casting a cast iron comprising 3 to 7 mass % of Al, and C and Si in such amounts that a carbon equivalent represented by formula (1) below is from 3.30 to 3.95;   heating the cast iron at a temperature falling within a range of 280 to 630° C.; and   cooling the cast iron, wherein formula (1) is as follows:
   carbon equivalent (mass %)=C content (mass %)+(⅓)×Si content (mass %)
 
   
     
     
         8 . The method according to  claim 7 , wherein the cast iron comprises C and Si in such amounts that the carbon equivalent represented by the formula (1) is from 3.30 to 3.95, 3 to 7 mass % of Al, 0.25 to 1.0 mass % of Mn, 0.04 mass % or less of P, 0.03 mass % or less of S, 0.03 to 0.20 mass % of Sn, and the balance of Fe and inevitable impurities. 
     
     
         9 . The method according to  claim 7 , wherein the temperature falls within a range of 360 to 580° C.