Abstract: In order to solve the problem of increasing the proportion of longitudinal cracks in the corner of the slab during the high-speed production of small chamfered mold in a steel plant, based on the existing chamfer furcal cooling structure water slot, a one-hole one-slot scheme with different round hole diameters and round hole positions was proposed. A three-dimensional heat transfer coupling model of the narrow side copper plate and cooling water was established. Industrial measured thermocouple temperatures and cooling water inlet/outlet temperature difference were used for validation. The temperature and velocity fields of the narrow side copper plate and cooling water were calculated for different one-hole-one-slot cooling structure schemes with different circular hole diameters and positions. The results show that the proposed one-hole-one-slot cooling structure with a circular hole diameter of 8 mm and a circular hole position of 26 mm results in a maximum temperature reduction of 14.4-17.6 K on the chamfered hot surface of bent copper plate and a maximum temperature reduction of 10.9-12.3 K on the chamfered hot surface of bolt cross-sectional copper plate, compared to the furcal water slots cooling structure. The cooling water flow in the circular hole reaches 8.4 m/s, effectively cooling the chamfered surface and vertex of the copper plate. Additionally, the cooling water flow rates on both sides of the bolt's water tank reach 10.0 m/s, enhancing the cooling uniformity of the plate around the bolt. 

Key words: small chamfered mold, narrow plate, chamfer copper plate cooling, structural optimization