包钢薄板厂冷轧工作辊剥落失效分析

对包钢薄板厂5Cr锻钢冷轧工作辊连续发生的剥落事故进行分析，指出了裂纹是导致剥落的根本原因，而轧辊的材质、磨削工艺、检测手段是产生剥落的影响因素，同时针对所存在的问题在配辊管理、磨削制度、检测制度三方面提出了技术改进措施。     

冷轧工作辊的早期失效及预防措施

讨论了冷轧工作辊接触疲劳裂纹、剥落、夹杂物裂纹和磨损等失效形式。指出冷轧工作辊早期失效三要形式为剥落，其原因为局部过热和过载。使用轧辊时定期磨削去除微裂纹和表面无损探伤是提高轧辊使用寿命的关键措施。     

冷轧支承辊边部剥落原因分析及对策

对在客户现场使用的支承辊边部剥落原因进行了分析认为,支承辊剥落是边部倒角结构不合理引起的接触应力疲劳剥落。针对其轧制特点,制定单机架冷轧支承辊边部倒角的加工规定,预防支承辊剥落事故的发生。     

关于冷轧辊的使用与维护

介绍了冷轧生产中所用冷轧辊的两种主要消耗类型 ,着重分析了冷轧辊产生剥落和断辊的原因及预防措施     

浅析冷轧辊辊面剥落原因及改善

冷轧辊是冷轧设备中的重要零件之一,冷轧辊质量直接影响着冷轧发展。因此人们总希望轧辊质量完美无缺,但由于种种原因,轧辊还会出现各种形式的损坏,其中最常见的损坏形式有三种:辊身断裂、辊面磨损和辊面剥落。其中辊面剥落是冷轧辊报废的主要形式,有人统计,由于剥落而引起的报废占冷轧辊总消耗量的70％以上,所以     

浅析冷轧辊表面剥落原因及改善

介绍冷轧辊表面剥落产生的原因，及在轧辊的生产和使用中采取佬措施预防辊面剥落。     

浅析冷轧辊的失效与维护

就宝钢冷轧薄板厂冷轧辊的使用状态介绍了冷轧辊的损耗类型,着重分析了冷轧辊产生剥落甚至爆辊的原因,同时提出了预防措施.     

辊面裂纹引起的冷轧辊大面积剥落失效分析

针对某产线冷轧工作辊多次出现大面积剥落事故,为了研究其失效原因,从剥落面断口观察、化学成分、工作层组织、淬硬层深度、裂纹扩展等角度对其进行了较为深入的分析研究。结果表明,该轧辊大面积剥落失效为疲劳裂纹扩展所致,裂纹源是轧钢过程中异常压痕产生的辊面裂纹。最后,针对如何预防辊面剥落恶性事故的问题,从轧辊使用、维护和设计制造三个角度提出了相应的建议,确保了近期未再发生类似的事件。     

冷轧HC轧机支承辊剥落失效分析及改进措施

通过断口分析和使用情况分析，找出冷轧ＨＣ轧机支承辊６次剥落失效的原因，主要是支承辊与中间辊肩部相接触的辊面承受着较大的辊间接触压力；疲劳损伤；磨削量过小；轧钢量过大，并提出相应的改进措施。     

冷连轧中间辊剥落原因分析

某厂中间辊上机使用后发生整个辊身的剥落,脱壳.通过金相组织、硬度检测等方法对该支轧辊进行了失效分析,认为中间辊的剥落原因是支承辊卡死后与中间辊发生滑动摩擦、烧伤引起的表面大面积龟裂.其结论对中间辊的失效分析和使用维护具有重要的指导意义.     

热连轧支撑辊剥落的原因分析

本文对梅山1422热连轧支撑辊剥落掉块和辊身边部“掉肩”进行了深入的分析,结果表明加工硬化、磨损不均匀、接触疲劳、辊身边部倒角设计不合理及工作层内缺陷是造成轧辊剥落的主要原因。并结合生产实际提出合理的使用维护方法与预防措施。     

The Properties and Performance of Cast Iron Grinding Media

Cast iron balls have been used for decades as a grinding media in all types of grinding applications. Early applications of cast iron grinding balls in mineral processing operations were disastrous due to spalling and premature breakage. Better control and understanding of a high chromium cast iron metallurgical system have led to the use of high chromium cast iron balls in all types of grinding. This paper reviews the wear properties of cast iron grinding media materials during dry and wet grinding conditions. The media wear mechanisms and the factors influencing the grinding ball wear during grinding are discussed, giving special importance to the corrosion and abrasion properties of cast iron media materials.     

酒钢二原料1#磨煤机本体检修方案优化

炼铁厂二原料1#磨煤机为ZGM113N中速辊盘式磨煤机,其碾磨部分是由转动的磨环和三个沿磨环滚动的固定且可自转的磨辊组成。年修周期一般为2年,年修工期在9 d左右,一般年修的主要任务量为磨环与磨辊更换。二原料磨煤机磨辊单重为10.5 t,而屋顶检修电葫芦的额定起重量为16 t,因此吊装工艺是否合理,将是整个磨煤机检修的关键。     

单机架冷轧支撑辊边部剥落原因分析

针对单机架冷轧生产中高牌号硅钢过程中出现的支撑辊剥离现象进行了深入分析,分析认为,加工硬化、接触疲劳、辊身边部倒角设计及磨削量不足是造成轧辊剥落的主要原因,并结合生产实际提出合理的使用维护方法与预防措施。     

Multiple Limit States and Expected Failure Costs for Deteriorating Reinforced Concrete Bridges

Accurate predictive analyses such as those associated with structural reliability and life-cycle costing are needed for the development of Bridge Management Systems. The present paper presents models for reliability and life-cycle cost analyses of reinforced concrete bridges damaged by corrosion. A stochastic deterioration process for corrosion initiation and propagation and then crack initiation and propagation are used to examine the effect of cracking, spalling, and loss of reinforcement area on structural strength and reliability. This will enable expected costs of failure for serviceability and ultimate strength limit states to be calculated and compared for different repair strategies and inspection intervals. It was found that, for a typical reinforced concrete slab bridge, the reduction of structural capacity at the time of severe cracking or spalling is relatively modest and causes probabilities of collapse conditional on spalling to increase by about an order of magnitude. Hence, expected costs of failure for serviceability were significantly higher than the expected costs of failure for ultimate strength limit states.     

O5板用辊的研究

根据O5板生产用辊要求,对其在磨削过程中产生缺陷的机理进行了分析,找出了消除缺陷的方法.从轧辊挑选、磨床状态、工艺方法、检查等四个方面进行控制,确保了磨出符合O5板轧制要求的轧辊.     

Effect of Microstructure on Impact Fatigue Resistance and Impact Wear Resistance of Medium Cr-Si Cast Iron

 A great amount of iron grinding balls in tube mills have been consumed. Under this impact abrasive wear working condition, the failure of wear resistant alloying white irons grinding balls is mainly caused by fatigue spalling. The impact wear resistance of martensitic high chromium cast iron (Cr of 15%) is not high sometimes, but its cost is not low. Thus, medium Cr Si wear resistant cast iron is recommended. The influence of the iron on impact fatigue resistance and impact wear resistance is pronounced. Ball on ball impact fatigue test and high stress impact wear test of the grinding balls have been carried out. The results show that the impact fatigue resistance (IFR) and impact wear resistance (IWR) of medium Cr Si cast iron are superior to those of martensitic high chromium cast iron (Cr of 15%). The main reasons are that (1) the stress in medium Cr Si cast iron is released in the as cast state; (2) the matrix is fine pearlite with better toughness and plasticity; (3) the pearlite is more stable compared with a retained austenite under repeated impact load and less phase transformation can take place; (4) high silicon content improves the morphology of eutectic carbide; (5) there is no secondary carbide which results in less crack sources. All these factors are beneficial to improvement of impact fatigue spalling resistance. The eutectic carbide M7C3 is the main constituent to resist wear.     

沙钢5m宽厚板轧机支承辊的使用技术

介绍了沙钢5 m宽厚板轧机支承辊的使用环境、使用技术和使用水平,指出适用的轧辊材质和性能、合理可控的换辊周期、优化的配辊和磨削技术以及完善的检测技术是轧辊使用和维护的关键。并对支承辊使用技术的发展作了展望。     

六辊可逆冷轧机组轧辊表面剥落原因分析及改善

以六辊可逆冷轧机组为研究对象，介绍常见的轧辊缺陷，主要是轧辊的表面剥落缺陷。从轧辊的使用、磨削、检测等方面，提出了相应的预防措施和消除方法。