板坯连铸机扇形段导轨的更换及安装工具

叙述了1500板坯连铸机扇形段更换导轨的定位原理、安装工具以及使用安装工具安装大型设备的特点与效果.     

马钢异形坯连铸机扇形段改造实践

分析了马钢第三炼钢厂异形坯连铸机扇形段在生产中出现的问题，针对这些问题，对扇形段进行了—系列的改造，达到了令人满意的使用效果。     

日本SPCO公司连铸机扇形段工艺分析

以宝钢分公司1900连铸机改造项目为例,介绍了日本SPCO设计的连铸机扇形段结构特点、制造难点及制造工艺。     

板坯连铸机扇形段制造质量控制

分析了板坯连铸机主要零件制造过程中的质量控制点,提出了相应的解决措施.     

薄板坯连铸机扇形段缺陷分析及改进

济钢中厚板厂针对连铸机扇形段暴露出的开口度超差、辊子漏水等问题,采取超公差控制、改进辊端结构和顺弧控制等措施,使扇形段的在线使用寿命大幅度提高,每台连铸机每年更换扇形段数量由30台降低到15台,同时提高了铸坯质量,降低了生产成本。     

大板坯连铸机扇形段的预变形优化

结合大板坯连铸机辊缝实际测量数据和扇形段结构特征的分析，查明了引起扇形段内部辊缝变大的主要原因。基于扇形段内弧辊架梁受力特征的分析，提出了一种扇形段预变形优化方法。按照扇形段内部辊缝变大的程度确定铸机实施调整的区域，实施后将扇形段内部辊缝增大量控制在0.2mm以内。     

板坯连铸机扇形段上框架有限元分析

采用有限元软件ANSYS8.0建立了扇形段上框架有限元模型,分别计算正常浇铸和重拉坯两种情况下,上框架的强度与变形情况,为扇形段框架的设计提供依据,可靠性提供保障。     

连铸机扇形段框架漏水修复工艺及实践

通过研究安钢连铸机扇形段的框架设计结构特性,找到一种解决扇形段框架漏水的修复工艺,经过实践证明,这种框架的修复工艺设计合理、方便维修、实用性强。     

对包钢轨梁厂技术发展的探讨

本文通过我国钢轨、型钢的市场需求及产品竞争能力分析,阐述了包钢轨梁厂的发展机遇与面临的挑战,认为轨梁厂的技术发展应定位在钢轨专业生产厂,发展重轨品牌战略上.生产精品钢轨,满足国内外铁路发展的需求,塑造强势品牌,参与国内外市场竞争.     

Influence of FCA Welding Process Parameters on Distortion of 409M Stainless Steel for Rail Coach Building

The influence of flux cored arc welding (FCAW) process parameters such as welding current, travel speed, voltage and CO2 shielding gas flow rate on bowing distortion of 409M ferritic stainless steel sheets of 2 mm in thickness was discussed. The bowing distortions of the welded plates were measured using a simple device called profile tracer. An experimental regression equation was developed to predict the bowing distortion and with this equation, it is easy to select optimized process parameters to achieve minimum bowing distortion. It is revealed that the FCAW process parameters have significant influence on bead profile and the bowing distortion.     

连铸机结晶器振动装置及扇形段安装调整技术

连铸机的结晶器与扇形段的安装为整个连铸机的关键,在安装过程中通过采用液压扳手控制技术、精密仪器及专用卡规综合测量技术、对弧样规、垫片调整技术、阶梯式调整等技术,保证了整个铸机的安装质量符合外方标准和生产工艺要求。     

Development of New Combined Manufacturing Technologies ‐ Influence of the Cutting Process on Workpiece Properties

Properties of materials for high‐strength structure components are influenced by production processes. These influences can be augmented by a combination of two presently consecutively executed process steps. The presented work shows first results in the development of novel combined manufacturing technologies, which along with prospective tools use this effect to adjust the material properties locally, adapted to the requirements. The combination consists of a merging of the process steps ‘material separation’ (metal cutting) and ‘changing properties’ (rubbing, rolling) to one single process step. For this purpose novel combined tools have to be developed. For the estimation of the possibilities of properties changes by combined processes at first the influences of single processes have to be determined. This contribution presents results of a “material separation” process. The investigated material is the industrially important aluminium wrought alloy AI7075‐T6, the applied process is orthogonal turning, the process parameters varied are cutting speed and feed as well as the tool geometry. Cutting force and feed force are measured, and the process influences on surface and subsurface properties are determined.     

焊接长钢轨运输过程中的断裂原因分析

通过金相显微镜和扫描电镜检验了钢轨焊接接头断口的宏观和微观形貌,检验发现U75V钢轨接头处对应轨头和轨底三角区中心区域存在大量高碳马氏体组织,而其它部位的显微组织正常.结合焊轨过程的操作工艺综合分析,确认钢轨断裂是正火处理后,接头表面温度下降到400℃以下,而轨头及轨底三角区中心部位温度仍在相变温度以上时,采用浇水强制冷却导致的组织异常现象所致.     

武钢重轨生产中取消缓冷工艺的探讨

介绍了武钢冶炼重轨钢经过真空脱气后氢含量控制以及钢轨热锯取样白点检验和性能对比情况，借鉴国外钢厂的经验提出了将武钢重轨除氢工艺从成品轨在缓冷坑除氢前移到低氢冶炼和钢水真空处理，并实行连铸坯热堆垛缓冷的工艺路线。     

浅谈机械加工工艺对金属零件加工精度的影响

现如今,我国机械加工行业在不断发展,市场对零件加工精度的要求也在不断提高。为了满足各类市场需求,要提升加工工艺,了解影响零件精度的主要原因,并采取有效的误差控制措施,进而出产更多合格产品。本文主要就机械加工工艺对金属零件加工精度的影响进行了相关的阐述和分析。     

3D Thermo-mechanical Coupled Simulation of Whole Rolling Process for 60kg/m Heavy Rail

3D thermo-meehanical coupled simulation of whole rolling process for 60 kg/m heavy rail was accomplished by FEM method. The finite element model, physical parameters of U75V and parameter setting of simulation were introduced in detail. The whole rolling process of 60 kg/m heavy rail was divided into 27 time cells to simulate respectively, and the model rebuilding and temperature inheritance method in intermediate pass were proceeded. Then, based on simulation results, the workpiece deformation result, metal flow, stress and strain of 60 kg/m heavy rail for typical passes were obtained. The temperature variation curves of whole rolling process for section key points of 60 kg/m heavy rail were plotted, and the temperature falling law of whole rolling process for 60 kg/m heavy rail was studied. In addition, temperature distribution of 60 kg/m heavy rail after whole rolling process was analyzed, and the results showed that temperature was highest at center of rail head and lowest at fringe of rail base. Moreover, the simulation results and measured results of rolling force for 60 kg/m heavy rail were compared, and the regularity was in good agreement.     

BD轧辊加工轴向定位精度控制工艺设计

根据大型闭口式孔型辊辊加工的特点,设计采用轧辊轴向定位精度控制工艺和焊接式成型刀具,成功地进行了BD轧辊的新辊加工和旧辊修复,满足了轧钢生产需要。     

一种发动机滤清器的焊接变形与工艺控制研究

一种发动机滤清器几何尺寸较大,在焊接过程中会产生较大的焊接变形,但设计要求焊后的平面度、端面平行度不大于2.5mm,很难满足要求。通过分析该产品的结构特点和变形影响因素,采取了设计焊接结构,优化焊接顺序和利用组合夹具等措施,有效控制了焊接变形并满足使用要求。