精轧机轧辊轴窜动原因分析与解决措施

运用轴承预紧理论对国产45°无扭精轧机轧辊轴轴向窜动故障进行了全面分析,对轴承预紧与轴向窜动的关系进行深入阐述,并从实际出发,提出了轧辊轴轴承组件预紧控制和调整方法。     

关于万能轧机轧辊轴向窜动间隙消除方案的探讨

某企业的万能轧机组功能是轧制高精度钢轨的重要设备。万能轧机的轧辊系是箱型孔型,由上下水平辊和两立棍组成;在孔型的组合变化上均由液压全自动控制。在实际的轧制过程中,由于轧件的金属流动变形产生的内应力不同,进而造成上下水平辊产生严重的轴向窜动,该窜动的间隙量严重影响着轧辊系孔型的变化,进而影响着轧件的规格,严重影响产品质量。故此,该文着重探讨了轴向窜动间隙产生的原因以及如何解决间隙的问题,从而保证产品的规格质量。     

F3精轧减速机高速轴轴窜分析

介绍承钢1780 mm精轧机F3减速机高速轴的轴窜问题,通过对轧制过程中高速轴的受力分析,结合现场检测,找出导致减速机高速轴发生窜动现象的原因,提出了具体改进措施,有效解决了轴向窜动现象,防止出现重大设备事故。     

型钢轧机轴向调节新机构研制

通过对国内某轧钢分厂型钢轧机轴向调节机构的技术改造，研制出蜗轮-蜗杆轧辊轴向调节新机构。该机构具有结构紧凑、调整精度高、轧辊轴向窜动量控制在止推轴承游隙范围内、轴向刚度大等优点，并显著提高轧制产品精度。本型钢轧机轴向调节新机构研制对于已有高刚度轧机的现代化技术改造和新型高刚度轧机设计具有重要的应用价值。     

万能轧机中保持板的故障分析与处理

如何防止万能轧机轧制钢轨的过程中,轧辊轴承座不出现轴向窜动现象,与保持板的合理设计和正确维护有至关重要的作用.本文针对近几年来保持板频繁发生的故障现象进行了原因分析,提出改进了方案,并应用到生产实际中,取得显著效果.     

轧辊锥体锥度检测仪

介绍了一种检测高速线材轧机轧辊锥轴与锥套锥度的检测方法以及相应的锥体锥度检测仪。该检测仪进行锥度测量的相对误差约为10-4,可在计算机上显示出被测锥体的实际轮廓,并可进行锥轴和锥套的虚拟装配,实现了锥体的高精度选择装配。     

弹性胶体在轧辊平衡中的应用

新型弹性胶体应用于高速线材轧机轧辊平衡装置,比传统的平衡装置成本低、工作可靠、使用效果好。     

离心铸造合金白口铸铁轧辊的研究

应用离心铸造方法,研制CrMoWVNb白口铸铁轧辊。分析合金元素在轧辊中的作用及裂纹产生原因,提出了消 除裂纹措施并应用于高速线材轧机预精轧机架,使用寿命达到高镍铬无限冷硬铸铁轧辊的4～5倍。     

轧辊轴向窜动分析及预防措施

介绍了非工艺性轧辊轴向窜动的危害,定性、定量地分析了其产生的原因,并提出技术改进措施。     

螺杆轴向窜动误差分析

螺杆轴向窜动误差是影响螺旋传动精度的重要因素之一,螺杆轴向窜动误差呈周期性变化.最大的轴向窜动误差计算公式为△max＝Dtanamin,对于αmin为什么取最小者,文献资料上并没有具体分析,针对此问题分三种情况展开分析了螺杆轴肩端面、轴承止推面的形位误差对螺旋传动精度的影响,进一步完善了最大轴向窜动误差的理论计算公式.     

国产高速线材精轧机辊箱常见故障分析及处理措施

主要介绍国产高速精轧机辊箱的一些常见故障并分析轧辊轴窜动超标、辊箱进水、油膜轴承烧毁和辊缝调整装置失效等故障原因,通过优化装配工艺、改进设计缺陷等进行改进,有效地降低国产仿摩根高线精轧机辊箱故障发生,也大大提高了辊箱平均使用寿命。     

高速线材精轧机油膜轴承油研制

冶金工业使用的高速线材精轧机机械传动复杂,精度高,速度快,其集中润滑系统(包括轴承、齿轮等)需要专用的油膜轴承润滑油.本文介绍了高速线材精轧机油膜轴承油的研制过程与应用,主要包括高速线材精轧机油膜轴承油基础油、添加剂配方的筛选,分别从理论上进行了论述,以正交试验方法确定最佳配方,并以充分的实验数据进行了验证,研制出高速线材精轧机油膜轴承油;其性能达到了美钢联136规格要求.     

高速轧机润滑油品含水率实时检测系统的设计

简要介绍了高速轧机润滑油品含水率实时检测系统的设计与应用情况,其使用效果明显．在国内同行业中处于领先地位。     

Consideration of some hot forming methods for producing better steels more cheaply

Some of the methods and equipment used in the steel industry for the securing of increased efficiency are discussed. Particular reference is made to continuous casting, covering such aspects as: working of the cast slab; the combination of continuous casting and edge rolling; slitting of wide slabs; widening of slabs; pre-forming of sections, etc. The paper goes on to consider typical rolling mills for both high and low capacity, reporting on: a high-capacity bar mill; a high-capacity rod mill; a bar mill — mini mill; a wire mill for special steels; a mill for hollow bars, with further reference to pass schedules, roll material, tolerances — automatic gauges, cooling beds, etc. Proposals for securing higher utilization are suggested.     

Experimental study for roll gap adjustment due to roll wear in single-stand rolling and multi-stand rolling test

To investigate a correlation between the amount of wear and roll gap (pass height) adjustment, we performed a single-stand reversible pilot groove rolling test as well as rolling test in an actual rod mill. In case of the pilot rolling test, we designed wear contour (profile) and machined it on the original roll groove (i.e., roll groove with no wear) to make the roll groove worn down. For the actual rod mill test, we developed a measuring device which can detect the actual wear profile. To determine the amount of roll gap adjustment, we propose a model for equivalent roll gap decrement which reduces the increased exit cross sectional area due to wear. We applied the proposed model to multi-stand rolling (roughing train of POSCO No. 2 Rod Mill) as well as single-stand reversible rolling. The wear profile of rolls worn down at each stand in mill yard was measured at different roll tonnage. The pilot hot rolling test shows that variation of exit cross sectional area is almost linearly proportional to roll gap change while the roll gap decreases from reference roll gap (6.5mm) to 3.5mm. In an actual rod mill which has consecutive rolling system, relationship between tonnage (total amount of tons that the produced rod weighs) and roll gap change at a stand is dependent on the rolling type (oval-to-round or round-to-oval) together with the cross sectional shape of incoming workpiece.     

新型UHMPE滤材的研制及在鞍钢高速线材轧机上的应用

针对高速线材轧机润滑的难题,研制开发了新型高分子滤材,并成功地进行了实际应用.     

无缝管工程中CTP到PQF横移小车的分析

文中介绍了包钢159连轧工程中,从穿孔机(CTP)到三辊连轧管机(PQF)之间的横移小车(天车系统),阐述了横移小车的结构组成、工作原理以及重要构件的计算与分析等。     

Analyses for roll force and torque in ring rolling, with some supporting experiments

Analyses are developed for predicting roll force and torque during ring rolling between plain cylindrical rolls. A nomograph is given to allow easy application of the theory. Conventional analyses for flat rolling are not generally appropriate to ring rolling, whereas the present theory considers the particular roll geometry and rolling conditions encountered in the process.Measurements of roll force and torque, taken during ring rolling experiments, are shown to be in good agreement with the theoretical predictions. The experiments are carried out on a new experimental mill having a mandrel which retracts axially for loading and unloading the ring, and is symmetrically supported between roller bearings within a four-column frame during rolling. This arrangement is believed to offer certain advantages over most commercial machines.     

国产高速线材轧辊箱常见故障分析及预防措施

本文阐述了国产高速线材轧辊箱常见故障,并进行原因分析,提出系统性的预防措施,为轧辊箱设备维护及维修提供技术保障.     

基于ARM的精轧机润滑油含水监测系统设计

针对高速线材生产冷却水污染精轧机润滑系统的问题,设计一种基于ARM Cortex M3处理器的在线式润滑油含水监测系统。该系统采用EIS阻抗谱传感器FWD-1,并对含水率测量值进行温度补偿,提高了测量精度和稳定性;采用了隔离型CAN总线网络,提高了网络通信的可靠性;主控站监控界面采用了uCOSIII和emWin系统。实验模拟测结果显示,该系统能够精确检测润滑油含水率,具有良好的实用价值。