At the beginning of the work, the core box is placed on the worktable, and the table is raised to make the core box and the bottom plate pressed tight. When shooting sand, open the shooting pressure valve, the compressed air in the air storage tank enters the shooting sand barrel through the gap on the shooting sand barrel, then the core sand forms a high-speed sand flow from the shooting hole into the core box, and the core sand is compacted, while the air is discharged into the atmosphere from the shooting head and the vent hole of the core box. It can be seen that sand shooting compaction is the completion of sand filling and sand tightening two processes at the same time, so the productivity is very high. It is not only used for core building, but also began to be used for modeling.