Two-platen die casting machine is mainly different from three-platen one in closing system.Closing system of two-platen die casting machine is made of plate of the fixed half and plate of the moving half.The locking device includes a split nut and a locking hydraulic cylinder.The split nut can realize close and open function.The teeth of the nut are engaged with the teeth on the tie bar when the nut is closed.The locking cylinder is a thin-walled hydraulic chamber

and it can expand to lock the die.