Process characteristics:In-line, six-cylinder structure. The self-hardening sand on-line production process is adopted for on-line core assembling, core setting, and pouring. Castings are poured using a horizontal pouring process. The pouring system is designed with the concept of large flow rate and low flow velocity. An overflow exhaust structure is added to the top surface to effectively ensure a controllable defect rate of pores and sand holes in castings.