考虑疲劳损伤的支撑辊主动再制造时机决策方法

Timing Decision Method for Predecisional Remanufacturing of Backup Roll Considering Fatigue Damage

针对轧辊再制造毛坯质量不确定导致其再制造前后性能不确定的问题,以支撑辊为对象,提出了考虑疲劳损伤的主动再制造时机决策方法。结合现有轧辊修磨技术,基于磨损和疲劳裂纹之间的耦合关系确定修磨量大小,研究了多次修磨对疲劳强度的影响;应用改进的非线性连续损伤理论,建立了支撑辊主动再制造时机决策模型;最后,对某四辊轧机中的支撑辊进行仿真分析,得到了辊面和辊颈的主动再制造时机,验证了该方法的可行性。

Aiming at the problem of the uncertain quality of roll remanufacturing blanks,which leads to the uncertainty of performance before and after remanufacturing,a timing decision method was proposed for predecisional remanufacturing of backup roll considering fatigue damage.Combined with the existing roll grinding technology,the sizes of grinding were determined based on the coupling relationship of wear and fatigue cracks,and the effects of multiple grinding on fatigue strength were studied.The improved nonlinear continuous damage theory was applied to establish a timing decision model for predecisional remanufacturing of backup roll.Finally,the backup rolls in a four-high rolling mill were simulated and analyzed,and the predecisional remanufacturing timings of the roll surface and the roll neck were obtained,which verifies the feasibility of the method.