Machine part blank casting mold with overflow discharging structure

The utility model discloses a machine part blank casting mold with an overflow discharging structure, which comprises a lower mold plate and a lower mold frame, the lower mold frame is arranged at the top end of the lower mold plate, an upper mold plate is arranged at the top end of the lower mold frame, an upper mold frame is arranged at the bottom end of the upper mold plate, a blank product is arranged in the lower mold frame below the upper mold frame, and the overflow discharging structure is arranged on the lower mold frame. An air overflowing groove is formed in the portion, below the blank product, in the lower die frame, an air overflowing column is installed at the bottom end of the air overflowing groove, and an air overflowing hole is formed in the center of the air overflowing column. According to the utility model, the mechanical part blank casting mold can discharge and output gas conveniently and quickly, one-way limiting and stopping of the gas hole are facilitated, and the gas is effectively