基于振动参数优化的方坯轴承钢铸坯表面渣沟缺陷控制OA

To address the problem of surface longitudinal slag streak defects occurring in the continuous casting production of GCr15 bearing steel with a 220 mm×220 mm billet section at Mas-teel Special Steel,systematic industrial trials were carried out to study the optimization measures of the mold sinusoidal oscillation parameters(frequency and amplitude).The orthogonal design method was adopted in the trials to analyze the effects of different parameter combinations on the casting surface quality.The results show that reducing the oscillation frequency from 161 min-1 to 149 min-1 and optimizing the amplitude to 6.7 mm can effectively extend the negative strip time and form shallow and uniform oscillation marks,thereby significantly improving the lubrication and heat transfer uniformity of the mold flux in the meniscus region,promoting flux consumption,and inhibit-ing the formation of slag rings and their extrusion on the initial shell.After the implementation of this optimization scheme,the surface slag streak defects of the casting were fundamentally controlled,ensuring the stable mass production of bearing steel.The surface qualification rate was significantly increased from 73.2%to 97.5%,and the breakout rate was reduced from 13.0%to 0,effectively solving the production problem and providing a practical basis for the setting of oscillation param-eters in high-carbon steel continuous casting processes.