Molten metal pouring device and centrifugal casting machine using the same

Abstract

A molten metal pouring device is configured to pour molten metal into a mold cavity formed between an upper mold and a lower mold of a centrifugal casting machine. The molten metal pouring device includes a pouring unit including an end formed with a pouring hole, through which the molten metal is poured into the mold cavity, the end of the pouring unit being inserted into a riser formed along a rotation axis of the upper mold and being drawn out of the riser as the molten metal is poured, a stopper inserted into the pouring unit to open and close the pouring hole so as to adjust the flow of the molten metal, and a base unit, to which the pouring unit is mounted, the base unit being configured to lift the pouring unit up and down.

What is claimed is: 
     
         1 . A molten metal pouring device for pouring molten metal into a mold cavity formed between an upper mold and a lower mold of a centrifugal casting machine, which are configured to be rotated while in an engaged state, the molten metal pouring device comprising:
 a pouring unit including an end formed with a pouring hole, through which the molten metal is poured into the mold cavity, the end of the pouring unit being inserted into a riser formed along a rotation axis of the upper mold and being drawn out of the riser as the molten metal is poured;   a stopper inserted into the pouring unit through the other end of the pouring unit and configured to open and close the pouring hole, so as to adjust flow of the molten metal; and   a base unit, to which the pouring unit is mounted, the base unit being configured to lift the pouring unit up and down.   
     
     
         2 . The molten metal pouring device according to  claim 1 , wherein the pouring unit includes a lower member configured to be inserted into the upper mold and formed to have a pipe shape having an outer diameter of a size corresponding to an inner diameter of the riser, and an upper member extending from the lower member in a funnel shape, and
 the stopper is formed to have a column shape having a diameter that is less than an inner diameter of the lower member and greater than a diameter of the pouring hole.   
     
     
         3 . The molten metal pouring device according to  claim 2 , wherein the stopper is pointed at an end thereof, so as to be inserted into the pouring hole. 
     
     
         4 . The molten metal pouring device according to  claim 1 , further comprising:
 a servo-motor mounted to the base unit; and   a seesaw member connecting the servo-motor and the stopper.   
     
     
         5 . A centrifugal casting machine having an upper mold and a lower mold configured to be rotated while in an engaged state and defining a mold cavity therebetween to receive molten metal poured thereinto, the centrifugal casting machine comprising:
 a molten metal pouring device configured to be lifted up and down so as to be inserted into or drawn out of a riser formed along a rotation axis of the upper mold, thereby adjusting whether the molten metal is poured and a speed with which the molten metal is poured;   a driving module configured to rotate a rotating shaft having an end coupled to the lower mold;   a cooling unit configured to cool the upper mold and the lower mold using cool air; and   an electric heater unit configured to heat the upper mold and the lower mold.   
     
     
         6 . The centrifugal casting machine according to  claim 5 , wherein the cooling unit includes:
 an upper cooler including a first chamber coupled to a top of the upper mold and a first pump for supplying cool air to the first chamber through a first passage; and   a lower cooler including a second chamber coupled to a bottom of the lower mold and communicating with a second passage formed in the rotating shaft and a second pump for supplying cool air to the second chamber through the second passage.   
     
     
         7 . The centrifugal casting machine according to  claim 5 , wherein the electric heater unit includes:
 an upper heater including a first heating wire mounted to a top of the upper mold and a first socket connected with the first heating wire and mounted to a bottom surface of an upper flange extending from a periphery of the upper mold;   a lower heater including a second heating wire mounted to a bottom of the lower mold and a second socket which is connected with the second heating wire, mounted to a top surface of a lower flange extending from a periphery of the lower mold, and engaged with the first socket;   a rotary connector connected with the second socket and mounted to the other end of the rotating shaft; and   a power supply connected with the rotary connector to supply electricity to the same.   
     
     
         8 . The centrifugal casting machine according to  claim 5 , wherein the driving module includes:
 a motor;   a driving belt for transmitting rotational force from the motor to the rotating shaft; and   a brake configured to selectively contact the driving belt to stop rotation of the rotating shaft.