Manufacturing method of complex camshaft cold core box sand core of large diesel engine body

The invention provides a manufacturing method of a complex camshaft cold core box sand core of a large diesel engine body. A core shooter cold core box manufactures a core, the advantages that the core sand is low in gas evolution, good in fluidity, easy to form and compact, the core box is not prone to deformation, the sand core is high in size precision, smooth in surface and good in collapsibility and deformability are utilized, and overall positioning of key size elements of different functional parts of the body is achieved on the side face of an outer mold. According to the specific shape, position and size of the camshaft part, a hot spot of the thick and large isolated part is balanced by using an inner chill and an outer chill, gas channels inside the sand core of the cold core box are connected into a net, a sand core gas channel is connected with a gas outlet in the side face of an upper-layer sand box, gas in the sand core is led out, and the dimensional accuracy and the internal and external qual