轧辊表面通常处于极不利的工作条件。大量断辊事故表明:轧辊断裂的根源是表面横向裂纹,与轧辊突然断裂直接相关的是裂纹的失稳扩展。本文阐述了轧辊裂纹的成因及其假设,分析了轧辊内各种应力的计算方法,建立了轧辊应力强度因子的近似公式,讨论了轧辊的复合型断裂条件,为解决轧辊断裂问题提供了一个分析途径。 The roll surface is usually in extremely unfavorable working conditions. A large number of broken roller accidents show that the root cause of roll breakage is surface transverse crack, which is directly related to the sudden rupture of the roll. In this paper, the cause of the roll crack and its assumptions are introduced. The calculation methods of the various stresses in the roll are analyzed. The approximate formula of the stress intensity factor of the roll is established. The composite fracture conditions of the roll are discussed. The analysis provides an analysis for the roll break problem way.