The running principle of squeezing casting mould with bi-parting surface was described systematically. The problems existed in the mould with bi-parting surface have been discussed

including getting and pouring liquid metal

separating remains from the sprue

setting leader and determining the length of leader. Given-distance parting mechanism in the mould with bi-parting surface was designed including pendulum-hooked parting

spring parting and given-distance leader parting. The production in practice has verified that the pendulum-hooked parting mould is suitable for the components with large diameter center runner

while the spring parting mould and given-distance lead parting mould suitable for ones with small diameters center runner.