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Study of measurement and control of free loop of hot steel strip in twin-roll strip casting

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Baosteel Technical Research 2018年第1期12卷 27-33页

作者： ye changhong FANG Yuan ZHANG Qing Research Institute Baoshan Iron & Steel Co.Ltd. Baosteel Engineering & Technology Group Co. Ltd.

In the twin-roll strip casting process, hot cast strips can be broken or tom if the casting speed does not match the rolling speed. Usually, a certain length of hot steel strip is hung freely between the caster and rolling mill to deal with the effect of this speed difference. In this paper,the freely hanging hot steel strip is referred to as the free loop of hot steel strip. Accurately measuring and controlling the height of this free loop is the key factor in maintaining a stable casting operation. Several methods for measuring the loop height of a steel strip are discussed and a method for accurately measuring and controlling the free loop height of hot steel strip is presented. Based on the results of the casting loop quantity change curve, this control method is confirmed to be effective and able to meet the requirements of continuous casting strip production.

关键词： twin-roll strip casting free loop height of free loop measurement method measurement error control of free loop height

Wear analysis of a side dam in twin-roll strip casting

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Baosteel Technical Research 2019年第3期13卷 14-18页

作者： ye changhong FANG Yuan ZHANG Yujun HAN Yuesheng Research Institute Baoshan Iron & Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and Rolling Shanghai 201999China Baosteel Engineering & Technology Group Co. Ltd.Shanghai 201999China

Reducing wear on a side dam can prolong the casting operation life of a twin-roll strip casting process,thus reducing production cost and improving casting *** lengthen the service life of the side dam,it is necessary to understand the wear performance of the side dam *** investigate the wear behavior mechanism of the side dam,in this study,the UMT-2 friction and wear tester was used to determine the relationship between the wear rate of the side-dam material and various *** on the roughness of the contact area between the side dam and the end of the casting rolls as well as on the amount of deformation of the side dam,which was derived using a thermal-deformation simulation model,the reasons for the uneven wear of the side dam were obtained.

关键词： twin-roll strip casting side dam wear test thermal deformation roughness of the contact region

Microstructure of shot-blasting casting roll and effect on strip solidification during strip-casting process

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Baosteel Technical Research 2019年第2期13卷 32-38页

作者： WANG Chengquan ye changhong ZHANG Yujun YU Yan FANG Yuan Research Institute Baoshan Iron & Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and Rolling Shanghai 201999China

In the strip-casting process,the surface topography of the casting roll has a significant influence on the solidification microstructure and surface quality of the as-cast strip. Shot-blasting treatment is an important way to achieve a suitable surface topography on the casting roll. In this study,a casting roll of beryllium copper alloy was shot blasted using steel pellets in the laboratory,resulting in a randomly distributed discontinuous peak and dent surface topography,in which cold deformation-slip bands and fine-deformation twins were formed. The thickness of the deformed copper alloy was about 100 μm during the shot-blasting process,and the copper hardness value increased significantly within 40 μm of the surface,with a maximum increase of more than 20% compared to the mean substrate hardness value. Within 60-100 μm of the surface,the hardness at the peak position was still higher than the copper substrate mean value,but the hardness at the dents was not,which was mainly due to the copper alloy slip and twinning deformation mechanisms. The surface hardness was similar to that of the substrate after the shot-blasted sample had been subjected to thermal shock. The molten steel first chilled and nucleated at the surface peaks of the casting roll;furthermore,fine dendrites grew and crossed over the middle of the dents. Therefore,the peak intervals of the shot-blasted surface are an important factor in solidification quality control.

关键词： shot blasting casting roll strip casting solidification

A unified computational model for surface texturing process of strip casting rollers

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Baosteel Technical Research 2019年第2期13卷 39-46页

作者： ZHANG Yujun YU Yan LIANG Yongli ye changhong FANG Yuan Research Institute Baoshan Iron &Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and Rolling Shanghai 201999China

A new unified computational method is proposed for modeling the relationship between the parameters of the high-speed particle-impact texturing process and the final surface morphology of the casting roller. The whole surface-texturing process is divided into three parts. The first part is the acceleration process of particles inside and outside the nozzle,which can be analyzed using the computational fluid dynamics method to obtain the particle impact velocities. The second part is a simulation of the bombardment process of particles onto the roller surface using the LS-DYNA software as the analysis tool and the results obtained in the first part as input parameters. The last part is the continuously random impact process of particles on the casting roller surface to form a functional surface,which is characterized by a simplified roughness model. Finally,the above three parts are combined to establish a unified computational model,the performance of which is successfully verified in a series of experiments.

关键词： strip casting casting rollers surface texturing numerical simulation unified computational model

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贵州草海斑头雁的冬季食性分析

动物学杂志 1998年第4期33卷 29-33页

作者：李凤山聂卉叶长虹国际鹤类基金会贵州威宁民族师范学校东北林业大学野生动物资源学院

在贵州草海越冬的斑头雁粪便中共检出３６种植物，其中天然植物２８种，栽培作物８种。禾本科植物是斑头雁主要食物，在其粪便中的平均检出率是６５０％，白花三叶草平均为１６４％，莎草科植物为９７％，农作物仅占５６％，其... 详细信息

在贵州草海越冬的斑头雁粪便中共检出３６种植物，其中天然植物２８种，栽培作物８种。禾本科植物是斑头雁主要食物，在其粪便中的平均检出率是６５０％，白花三叶草平均为１６４％，莎草科植物为９７％，农作物仅占５６％，其他的材料为３３％。随着月份的不同，六种主要植物及栽培作物在斑头雁粪便中的变化非常明显（Ｐ＜００００１，ｄｆ１＝４，ｄｆ２＝７０）。

关键词：斑头雁食性粪便分析

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开发水泥生产线纯低温余热发电新技术

中国水泥 2006年第9期 85-87页

作者：叶长虹中信重型机械公司河南洛阳471039

1前言中信重型机械公司作为大型干法水泥成套设备生产的龙头企业,积极响应国家产业政策,经过几年来持续研究和攻关,开发出了水泥熟料于法生产线的纯低温余热发电双压技术,通过了国内行业专家论证,已投入市场.为水泥行业走向循环经济提... 详细信息

1前言中信重型机械公司作为大型干法水泥成套设备生产的龙头企业,积极响应国家产业政策,经过几年来持续研究和攻关,开发出了水泥熟料于法生产线的纯低温余热发电双压技术,通过了国内行业专家论证,已投入市场.为水泥行业走向循环经济提供了一项新技术,开辟了新途径,受到了水泥行业的广泛欢迎.

关键词：低温余热发电水泥生产线技术开发水泥行业干法生产线龙头企业设备生产

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信息技术在档案管理中的应用研究

电子测试 2016年第3期27卷 83-83,104页

作者：叶长虹佳木斯市疾病预防控制中心 154007

档案管理工作已经成为人们关注的焦点。人们的生活和工作都需要从档案中调取相关信息与材料。而传统的档案管理重在保存纸质文件,对档案信息的信息化管理与应用,没有给予足够的重视。导致了档案信息获取困难,档案文件保存耗费巨大人力... 详细信息

档案管理工作已经成为人们关注的焦点。人们的生活和工作都需要从档案中调取相关信息与材料。而传统的档案管理重在保存纸质文件,对档案信息的信息化管理与应用,没有给予足够的重视。导致了档案信息获取困难,档案文件保存耗费巨大人力与物力资源等现象的发生。现在信息化技术在档案管理中的应用,解决了这些问题。本文就档案管理中存在的问题、信息化技术的具体应用以及未来的展望进行了详细的阐述。

关键词：信息化档案人事评定查询

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薄带连铸摆动导板的工艺研究与设备设计

宝钢技术 2018年第4期11卷 52-57页

作者：韩月生叶长宏宝钢工程技术集团有限公司上海201900 上海薄带连铸连轧工程技术研究中心上海201900 宝山钢铁股份有限公司中央研究院上海201900

根据薄带连铸的技术特点,研究了摆动导板的工艺参数;选取一组参数进行摆动导板的设备设计,并对摆动导板进行力学计算,确定设备的关键参数,用于详细设计及配套件选型;对导板本体进行热应力校核及热变形仿真,仿真计算结果满足摆动导板的... 详细信息

根据薄带连铸的技术特点,研究了摆动导板的工艺参数;选取一组参数进行摆动导板的设备设计,并对摆动导板进行力学计算,确定设备的关键参数,用于详细设计及配套件选型;对导板本体进行热应力校核及热变形仿真,仿真计算结果满足摆动导板的使用要求。

关键词：薄带连铸工艺参数铸带导向摆动导板

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双辊薄带连铸熔池密闭方法及结构分析

世界钢铁 2012年第1期12卷 29-33页

作者：姜洪滨叶长宏上海宝华国际招标有限公司宝山钢铁股份有限公司

双辊薄带连铸生产薄带钢技术具有节能环保、工艺流程短等优点。对已公开的薄带连铸熔池密闭室工作方法及结构形式进行了分析,并按照功能和结构将熔池密闭室分为:可分段控制铸辊冷却强度的熔池密闭室装置、多气体腔室的熔池密闭室装置、... 详细信息

双辊薄带连铸生产薄带钢技术具有节能环保、工艺流程短等优点。对已公开的薄带连铸熔池密闭室工作方法及结构形式进行了分析,并按照功能和结构将熔池密闭室分为:可分段控制铸辊冷却强度的熔池密闭室装置、多气体腔室的熔池密闭室装置、采用混合气体影响熔池传热的熔池密闭装置以及能主动去除熔池表面浮渣的熔池密闭室装置等,最后总结了一套密闭室的设计思路。

关键词：双辊薄带连铸熔池密闭室