共查询到16条相似文献,搜索用时 125 毫秒
1.
2.
3.
结合实际项目,就解决六辊单机架冷轧机组出现的带钢表面清洁度差、吨钢轧制油耗高、乳化液系统电机过载、管路系统振动大、板换及阀门备件更换频繁、乳化液泄漏等等问题,提出了降低带钢表面乳液残留,改善工艺润滑环境,降低设备备件、轧辊、轧制油消耗等一系列工艺设备改造措施,经过改造后,各项技术经济指标均达到了国内先进水平。同时为后续新建和改造类似项目的优化设计提供了可行的技术方案。 相似文献
4.
针对传统双机架平整兼二次冷轧机的系列问题,开发了一套双机架六辊UCM平整兼二次冷轧机组。该机组相对传统机型增加中间辊窜辊、中间辊弯辊等板形调节手段,更好地改善板形;该机型采用1#机架乳化液直喷辊缝润滑、1#机架配置双辊系,大幅度降低轧制力、提高轧制稳定性;该机型开发乳化液阻隔及防结露装置、辊缝吸尘装置及支承辊擦拭器等装置,降低板面乳化液残留、消除金属粉尘,提高产品质量,减少环境污染。 相似文献
5.
针对二次冷轧机组轧制升降速过程中轧制压力波动的问题,充分考虑乳化液直喷系统的设备与工艺特点,在分析了轧制速度、乳化液体积分数等对带钢表面析出油膜厚度、轧制变形区油膜厚度、摩擦因数、前滑值、轧制压力影响的基础上,建立了乳化液体积分数与轧制速度之间的对应关系,通过在线实时调节乳化液体积分数弥补升降速过程轧制压力的波动,形成一套二次冷轧机组乳化液体积分数在线控制技术。本技术在某钢厂1 220二次冷轧机组应用后,有效地减少了升降速过程轧制压力与带钢厚度波动,提升了轧制稳定性与产品质量,具有进一步推广应用的价值。 相似文献
6.
7.
结合现场生产实践,针对单机架冷轧机组出现的管路系统振动大的问题,提出降低管道压力、加固部分管道、更改管道连接方式等一系列工艺技术措施。经过改造后,彻底解决了乳化液系统震动问题,大幅降低了相应的故障处理时间和轧制油耗。 相似文献
8.
9.
为了解决二次冷轧机组轧制过程中带钢上、下表面油膜厚度存在差异的问题,通过分析油膜厚度形成与演变机理,建立了二次冷轧机组带钢上、下表面析出油膜厚度计算模型。在此基础上,采用增加带钢下表面乳化液流量和乳化液配比浓度的方法,开发出一套二次冷轧机组带钢下表面润滑工艺补偿技术。通过该技术实现了二次冷轧机组带钢上、下表面轧制变形区油膜厚度均等的目标,同时,最大程度降低了带钢表面条状斑迹缺陷的发生率。并将该技术应用到国内某钢厂1 220二次冷轧机组,应用效果显著,典型钢种带钢上、下表面条状斑迹缺陷发生率大大降低,降低程度均在50%以上。 相似文献
10.
11.
12.
13.
为解决现场无法在线测量轧辊表面油膜厚度的问题,考虑二次冷轧机组润滑设备与工艺特点,在阐述了二次冷轧过程轧辊表面油膜厚度形成及演变过程机理的基础上,运用流体动力学原理,建立了一套适合于二次冷轧机组的轧辊表面油膜厚度模型。定量分析了轧制速度、轧辊表面粗糙度、辊间接触最大应力、乳化液初始动力黏度和乳化液压力黏度系数等5个因素对轧辊表面油膜厚度的影响规律。将轧辊表面油膜厚度模型应用到某厂1220二次冷轧机组,并通过对比建立的模型求解得出的轧辊表面油膜厚度与现场离线采用称重法测量得到的轧辊表面油膜厚度结果发现,两者误差小于10%,这表明模型计算精度满足现场使用要求。 相似文献
14.
15.
《Baosteel Technical Research》2010,(Z1):79
SUS304 stainless steel is typical of austenitic stainless steel,which organization is metastable austenite,easily appears work hardening in cold rolling.According to the common process,the max reduction of cold rolling in one stage is below 80%,we try to rasie the max reduction to 90%in one stage (wecalled that "great reduction" ) from the view of cuting cost.Due to the work hardening,great reduction brings lots of problem(the difficulty of flatness control,strip break..etc)。This article analyzed the great reduction from properity of SUS304 steel,mill types,flatness control,rolling technics etc,supplied the corresponding solutions,and formed a sophisticated great reduction theory. This article focuses on the unusual thermal crown of raw materials(ie,abnormal distribution of horizontal thickness) and the rolling force fluctuations in "great reduction" rolling.First,the "distortion" phenomenon which caused by unusual thermal crown of raw materials is explained,wedge-shaped strip In coiling, because of a big difference in thickness on both sides,leads to different compressive stress on both sides of flatness roll,so that the flatness measurement is distorted;Second,the "strip shifting" phenomenon caused by wedge shape of strip is explained,we analysis the stress on both sides of the strip,concluded that the wedge-shaped strip on the coiler will shift to the thick side of the deviation,the amount of strip shifting is related to the wedge level;Because of the characteristics of SUS304,the strip is difficult to be rolled in the last few passes.so the strip breaking is easily occurred,we found the reasonable parameters(rolling speed, cooling oil,tension,etc) to solute that problem;The deviation of rolling force will cause the shape of the roll gap,thus affecting the shape control,especially in the head and tail part of the strip,It is important to minimize the deviation of rolling force;The "great reduction" process provide the favorable flatness(< 8I-unit) and thickness deviation which less than±3 um,with no significant difference between common process.In mechanical properties,the elongation of the great reduction strip is less than common products by 2%-3%,but that can be adjusted through the annealing process improvement.At present,we have been using this technology for mass production,achieving good economic benefits. 相似文献
16.
利用大型有限元软件Marc建立了轧制过程三维有限元仿真模型,以某1700mm冷连轧机为对象,分析了冷连轧机不同入口厚度和不同架次下的金属横向流动的特点,发现冷连轧机门户机架1#机架带钢厚度最厚、压下量最大,带钢金属横向流动最有条件,为实现凸度和平坦度的解耦创造了基础。提出了一种新的边降控制工作辊辊形即连续变锥度工作辊CVTR(Continuously Variable Taper Roll),并配套使用VCR(Varying Contact Length Backup Roll)支持辊,提高了轧机的辊缝横向刚度,增强了轧机抵抗轧制力波动而保持不变的能力,为实现板形的良好控制创造了条件。 相似文献