Cooling simulation method, cooling simulation program, cooling simulation device, and method of cooling workpiece

Abstract

A cooling simulation method is a cooling simulation method for predicting a temperature change inside a heated workpiece when a coolant is brought into contact with the workpiece. In the cooling simulation method, a flow velocity of the coolant on the surface of the workpiece is calculated by a flow analysis of the coolant by a thermal fluid simulation, and the temperature change inside the workpiece is calculated based on a temperature of the surface of the workpiece and the calculated flow velocity.

What is claimed is: 
     
         1 . A cooling simulation method for predicting a temperature change inside a heated workpiece when a coolant is brought into contact with a surface of the workpiece, the cooling simulation method comprising
 calculating a flow velocity of the coolant on the surface of the workpiece by a flow analysis of the coolant by a thermal fluid simulation, and calculating the temperature change inside the workpiece based on a temperature of the surface of the workpiece and the calculated flow velocity.   
     
     
         2 . The cooling simulation method according to  claim 1 , wherein a heat transfer coefficient on the surface of the workpiece is estimated based on the temperature of the surface of the workpiece and the flow velocity, and the temperature change inside the workpiece is calculated using the heat transfer coefficient. 
     
     
         3 . The cooling simulation method according to  claim 2 , wherein a value of the heat transfer coefficient is determined in consideration of a boiling phenomenon of the coolant. 
     
     
         4 . The cooling simulation method according to  claim 1 , wherein a temperature of the coolant on the surface of the workpiece and a pressure of the coolant are also calculated by the thermal fluid simulation, and the temperature change inside the workpiece is calculated based on the temperature of the surface of the workpiece, the flow velocity of the coolant, the temperature of the coolant, and the pressure of the coolant. 
     
     
         5 . The cooling simulation method according to  claim 4 , wherein a heat transfer coefficient on the surface of the workpiece is estimated based on the temperature of the surface of the workpiece, the flow velocity of the coolant, the temperature of the coolant, and the pressure of the coolant, and the temperature change inside the workpiece is calculated using the heat transfer coefficient. 
     
     
         6 . The cooling simulation method according to  claim 1 , wherein when the temperature change inside the workpiece is calculated, a structure, a stress, and a strain of the workpiece are also calculated. 
     
     
         7 . The cooling simulation method according to  claim 6 , wherein a deformation of the workpiece is fed back to the thermal fluid simulation. 
     
     
         8 . The cooling simulation method according to  claim 1 , wherein the temperature change inside the workpiece is fed back to the thermal fluid simulation. 
     
     
         9 . The cooling simulation method according to  claim 1 , wherein an initial value of the temperature of the surface of the workpiece and an initial value of the temperature inside the workpiece are obtained by a simulation when high-frequency induction heating is performed on the workpiece. 
     
     
         10 . A cooling simulation program for predicting a temperature change inside a heated workpiece when a coolant is brought into contact with a surface of the workpiece, the cooling simulation program causing a computer to
 calculate a flow velocity of the coolant on a surface of the workpiece by a flow analysis of the coolant by a thermal fluid simulation, and calculate the temperature change inside the workpiece based on a temperature of the surface of the workpiece and the calculated flow velocity.   
     
     
         11 . A cooling simulation device for predicting a temperature change inside a heated workpiece when a coolant is brought into contact with a surface of the workpiece, the cooling simulation device comprising:
 a calculator that calculates a flow velocity of the coolant on the surface of the workpiece by a flow analysis of the coolant by a thermal fluid simulation, and calculates the temperature change inside the workpiece based on a temperature of the surface of the workpiece and the calculated flow velocity.   
     
     
         12 . The cooling simulation device according to  claim 11 , further comprising:
 a storage that stores a relation between the temperature of the surface of the workpiece, the flow velocity of the coolant, and the heat transfer coefficient on the surface, wherein   the calculator acquires the heat transfer coefficient from the storage based on the temperature of the surface of the workpiece and the calculated flow velocity, and calculates the temperature change inside the workpiece using the read heat transfer coefficient.   
     
     
         13 . A method of cooling a workpiece, comprising:
 determining a cooling condition by the cooling simulation method according to  claim 1 ; and   cooling the workpiece under the determined condition.   
     
     
         14 . The method of cooling a workpiece according to  claim 13 , wherein
 the cooling condition includes a shape of a cooling jacket, and   in the cooling the workpiece, a cooling jacket having the shape determined in the determining the cooling condition is used.