Method of producing same-edition split mould capable of generating two pieces in one box

The invention relates to a method of producing a same-edition split mould capable of generating two pieces in one box. The method comprises the following steps: step one, preparing an upper mould (2) provided with a pin (15) for positioning and a lower mould (1) provided with a pin hole (16) for positioning; step two, placing the upper mould (2) and lower mould (1) on a moulding flat plate (11), and then placing an upper sand box (5); step three, turning an upper casting mould (12) in 180 degrees, and blowing carbon dioxide gas into the upper casting mould (12) to hardening the upper casting mould (12); step four, covering the upper mould casting mould (4) and a sprue gate (10), putting a lower sand box (6), and filling sand; step five, pasting mud numbers on three sides of joint between the upper mould (2) and the lower mould (1), taking out the upper mould (2) and lower mould (1); step six, assembling the upper mould (2) and the lower mould (1); step seven, placing the moulding flat plate (11) on the lower sand box (6), turning 180 degrees, blowing carbon dioxide gas to harden a second lower casting mould (14), taking out the lower mould (1) and upper mould (2); step eight, establishing an inner sprue, and carrying out core setting and mould assembling so as to obtain the mould.