Ultra-large type integrated car body chassis die-casting die and die-casting process

The invention relates to the technical field of die-casting, in particular to an ultra-large type integrated car body chassis die-casting die and a die-casting technology.The die-casting die comprises a movable end, a fixed end, a first cavity and a second cavity, and a first piston cavity with a first piston is formed between the first cavity and the second cavity; the first piston is in sliding connection with the fixed end and is connected with a first elastic piece, a second piston cavity with a second piston is formed in the inner end of the first piston, a second elastic piece is connected between the second piston and the second piston cavity, an inner mold locking hole for clamping the second piston is formed in the movable end, and an unlocking structure is arranged at the position of the inner mold locking hole of the movable end; according to the ultra-large type integrated car body chassis die-casting die and the die-casting process, secondary die locking can be automatically achieved after molten