在分析连铸机拉矫辊破坏原因的基础上，提出了预应力结构拉矫辊，并对拉矫辊的热应力、预应力辊的预应力及其工作时的总应力进行了光弹和热光弹性实验研究。结果表明预应力辊内、外表面处的应力幅值有了较大的降低。 Based on the analysis of the causes of the straightening roll straightening of the continuous caster, a straightening and stretching roller with prestressed structure was proposed. The thermal stress of the straightening roller, the prestressing force of the prestressing roller and the total stress of the straightening roller during its operation were studied by photoelastic and Thermal Photoelastic Experimental Research. The results show that the stress amplitude at the inner and outer surfaces of the prestressed roller has been greatly reduced.