HC可逆冷轧机轧辊失效改进措施的试验研究

以1200HC6辊可逆冷轧机轧辊为研究对象,从轧辊检测、磨削和装配等多方面提出了轧辊缺陷的预防和消除措施.首先,采用磁粉探伤、便携式轧辊表面硬度检测仪、低倍组织分析等先进检测手段,及时发现肉眼难以观测到的轧辊缺陷.其次,通过改进工艺冷却润滑系统和过滤装置,给定轧辊合理的磨削量和换辊周期,采取中间辊、支撑辊两个肩部加工复合倒角等措施,降低轧辊消耗,提高轧辊寿命.改进后,轧辊换辊周期由原来的100 km提高到160 km,轧辊缺陷、轧辊消耗(含中间辊和支撑辊)大幅度降低,轧机小时产量提高11.1%.

Experimental Investigation on Elimination of Roll Defects for HC Reversing Cold Mills

For the rolls of the 1200 HC(high crown) 6-high reversing cold mills,the measures of precaution and elimination of roll failures were put forward from some aspects such as roll inspection,roll grinding and assembly etc.Firstly,advanced inspection methods such as magnaflux method,portable roll surface rigidity detector,macrostructure analysis and so on should be applied to find out the roll defects,which are difficult to be observed with naked eyes.Secondly,some measures,such as modifying cooling and lubrication systems and filtrating equipment,designing reasonable grinding amount and roll changing period,and machining the compound chamfer angles at two shoulders of the intermediate rolls and backup rolls etc.,can reduce roll consumption,and increase roll campaign.After modification,the roll changing period was increased from 100 km to 160 km,the roll defects and consumption(including the intermediate rolls and backup rolls) were greatly decreased,and the hour output of mill was improved by 11.1%.