Casting apparatus for cylinder head and heat treatment method for cylinder head

Abstract

A casting apparatus for a cylinder head and heat treatment method for a cylinder head manufactured by the apparatus is provided. The casting apparatus for a cylinder head is connected with a mold by a pressing unit and a connection pipe and casts a product by pressing and injecting molten metal into the mold. A heat treatment method for the cylinder head manufactured by the apparatus includes: a molten metal supply unit that stores and stabilizes supplied molten metal and a pressing unit that is separately formed from the molten metal supply unit, receives the stabilized molten metal from the molten metal supply unit, and supplies the molten metal to the mold. In addition, a stopper that is soaked in the molten metal in the molten metal supply unit controls the amount of molten metal sent to the pressing unit.

What is claimed is: 
     
         1 . A casting apparatus for a cylinder head which is connected with a mold by a pressing unit and a connection pipe and casts a product by pressing and injecting molten metal into the mold, the apparatus comprising:
 a molten metal supply unit that stores and stabilizes supplied molten metal;   a pressing unit separately formed from the molten metal supply unit, receives the stabilized molten metal from the molten metal supply unit, and supplies the molten metal to the mold; and   a stopper soaked in the molten metal in the molten metal supply unit controls the amount of molten metal sent to the pressing unit.   
     
     
         2 . The apparatus of  claim 1 , wherein the stopper is moved vertically by a driving cylinder, and includes:
 a rod formed at one end of the driving cylinder and selectively inserted into a connection aperture that connects the pressing unit and the molten metal supply unit; and   a refractory material coated on the rod.   
     
     
         3 . The apparatus of  claim 2 , wherein the rod is made of an SUS material. 
     
     
         4 . The apparatus of  claim 1 , wherein four molten metal gates are symmetrically formed at the upper portion of the connection pipe. 
     
     
         5 . The apparatus of  claim 1 , wherein combustion cooling channels and spark plug pins are formed at the mold. 
     
     
         6 . A heat treatment method of a cylinder head manufactured by a casting apparatus for a cylinder head, comprising:
 solution treatment of the cylinder head manufactured by the casting apparatus;   quenching cylinder head materials; and   aging the cylinder head materials, wherein the casting apparatus includes:
 a molten metal supply unit that stores and stabilizes supplied molten metal; 
 a pressing unit separately formed from the molten metal supply unit, receives the stabilized molten metal from the molten metal supply unit, and supplies the molten metal to the mold; and 
 a stopper soaked in the molten metal in the molten metal supply unit controls the amount of molten metal sent to the pressing unit. 
   
     
     
         7 . The method of  claim 6 , wherein the solution treatment is performed for about 3.5˜4.5 hours with a temperature range of about 490-510° C. 
     
     
         8 . The method of  claim 6 , wherein the aging is performed for about 3.5˜4.5 hours with a temperature range of about 240-260° C. 
     
     
         9 . The method of  claim 6 , wherein the quenching is performed to about 70-80° C.