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冷轧板带残余应力是影响板带质量的重要因素。为了提高板形质量,根据板带轧制前后体积不变原理,推导了残余应力的数学模型,采用有限元法对板带失稳时的临界载荷进行了求解,运用解析法和有限元法相互耦合的计算方法建立了板带失稳后的残余应力修正模型。结果表明:初始残余应力的作用使板带产生了失稳,因此需要对残余应力进行修正计算,修正后的残余应力与现场实测结果有较好的一致性。
Cold rolled strip residual stress is an important factor affecting strip quality. In order to improve the quality of the strip shape, the mathematical model of residual stress is deduced according to the principle of constant volume before and after strip rolling. The critical load of strip instability is solved by the finite element method. The analytic method and the finite element method Coupling the calculation method to establish a model of residual stress correction after instability of the plate. The results show that the effect of initial residual stress destabilizes the strip, so the residual stress needs to be corrected and calculated. The corrected residual stress is in good agreement with the field measurements.