棒材连轧线冷床齐头分析及齐头辊道结构改进

分析了目前国内外棒材连轧线冷床齐头系统存在的不足，特别是对切分轧制时冷床齐头存在的问题，介绍了一种新型结构的齐头辊道，很好的解决了冷床齐头，特别是切分轧制冷床齐头问题。     

螺纹钢冷床头部弯曲分析与措施

中南股份棒材三号线于2022年1月完成改造热试，由于工艺与设备的改变导致成品上冷床后，在冷床头部出现弯曲现象，严重制约了冷床的工作能力与冷飞剪的剪切效率。针对螺纹钢上冷床后弯曲现象，从加热温度、轧后冷却、倍尺剪切等因素分析，制定方案，并成功改善了冷床弯钢现象。     

立置式钢板冷床

冷床是精整设备中重量及占地面积最大的设备，直接影响钢板的质量，立置式钢板冷床的特点是钢板垂直立于冷床上做步进式移动。通过与现有冷床进行分析比较，表明该冷床是一种钢板冷却快，冷却均匀，无划伤，钢板平面度好，占地面积小，投资省的新型冷床。     

六轧钢厂冷床改造

介绍了涟钢六轧钢厂冷床的现状，通过计算确定冷床起始线的位置，校核传动轴的强度，以增加冷床的长度，提高定尺率，适应提速轧制。     

现代化小型冷床上料装置结构设计分析及计算

近年来，由于轧钢工艺趋向于采用无扭轧制等先进技术，使轧制速度迅速提高，对冷床高速上料装置提出了更高的要求。冷床高速上料装置是冷床设计中的难点，也是关键设备，它的设计质量与安装精度直接决定着产品的最终质量。本文对冷床高速上料装置进行了结构分析与计算，对冷床的设计、维护有一定的指导意义。     

步进冷床轧件制动问题的探讨

步进齿条式冷床具有冷却效率高、轧件冷却均匀等优点，且在冷床运输冷却的过程中对轧件具有矫直作用，是现代小型、中型、无缝钢管生产线普遍采用的冷床，轧件进入冷床时一般是高速，要求上冷床床体前要完全静止，在这短时间内轧件从高速至静止并安全上冷床，其中一个重要机构就是制动板。轧件在冷床输入端的制动是步进式齿条冷床的一个重点技术课题。     

一种防碰撞冷床拔爪

目前，国内地方钢铁650轧机的冷床，仍广泛采用集中传动齿条式冷床。这种冷床的推钢拔爪，在待推钢时，齿条与推杆连接处的和第一个拔爪，通常要隐藏在辊道盖板的侧板背后，以避免拔爪被轧件冲坏，但是齿条与辊道伞齿轮传动轴之间的高度仅80mm，所以使用中冷床后退时，拔爪安装部位很容易碰撞伞齿轮的传动轴，造成辊道传动机构碰坏，影响生产的正常进行。为了解决冷床齿条与推杆连接处的拔爪防碰撞问题，设计了一种L型冷床拔爪，如图1所示。图IL型冷床拔爪示意图1－冷床推杆；2－拔爪；3－拔爪轴；4－L型拔爪；5－冷床齿条这种L型冷床拔爪…     

滚动式步进冷床齿条设计研究

对滚动式步进冷床齿条齿形参数进行了理论研究，导出了轧件纯滚动条件；分析了齿条运动速度对齿形参数的影响；建立了常用轨迹冷床齿条参数计算公式，为该冷床设计和使用打下了基础     

无缝钢管生产线冷床及选型

冷床是无缝钢管生产线上必不可少的设备,冷床的形式有多种,可根据生产需求的不同进行选择.总结了单链冷床、双链冷床、新型链式冷床、步进齿条式冷床、螺杆式冷床等各种冷床的优缺点,介绍了无缝钢管生产线上各种冷床的结构、工作原理及特点,为用户选择和设计冷床提供了参考.     

冷床传动系统动力学分析及适时控制

本文对冷床传动系统进行了动力学分析，并指出适时性控制方案，为解决冷床的启停运动方式提供了依据。     

浅谈水平连铸TP2紫铜管坯的工艺制度

水平连铸TP2紫铜管是铸轧法生产优质空调管坯的第一步工艺,其产品质量的好坏对最终空调管坯起决定作用。严格地按照工艺制度进行生产是为获得质量优良、稳定的铸造管坯的前提条件,水平连铸TP2铜管工艺制度主要包括铸造温度,铸造速度、冷却强度三方面,本文将对水平连铸铜管坯铸造生产过程中的三项工艺制度进行探讨。     

金属半固态铸造成形技术

金属的半固态铸造是近年来出现的一种新的铸造加工成形方法。该方法与传统的全液态铸造相比，具有节约能源、生产率高、产品质量好等优点。本文介绍了半固态金属浆料的制备方法，半固态压铸、半固态连铸等金属半固态铸造成形技术，并指出了存在的问题及进一步研究工作。     

Steel ladle exchange models during steelmaking and continuous casting process

The models and influencing factors of steel ladles exchange during the steelmaking and continuous casting process of H steel plant were investigated.Based on analysis of the operation process and turnover time of steel ladles, relationship models for the turnover number, turnover rate, continuous casting number, number of ladles with additional turnover, and number of ladles without additional turnover were built.The turnover rules of steel ladles for one basic oxygen furnace (BOF) matching one continuous caster (CC) and two BOFs matching two CCs modes were simulated by using a Gantt chart.The models of steel ladle exchange were proposed for casting of a single CC and overlapping casting of two CCs.By analyzing the influencing factors, the following conclusions were drawn.The exchange ladle should not have the task of transporting liquid steel in the CC that stops casting earli-er.The end time of the empty ladle in the CC that stops casting earlier should be earlier than the start time of the full ladle in the CC that stops casting later.After evaluating the factors influencing the start casting time, turnover cycle, casting time, continuous casting number, and overlapping time, a prioritization scheme of steel ladle exchange was proposed based on the steel grade.First, the turn-over cycle and single heat casting time were determined; based on these, a reasonable ladle turnover number was calculated.Second, the turnover number and continuous casting number were optimized for maximizing the number of ladles without additional turnover.Lastly, to reduce the casting number during the overlapping time to be lower than the turnover number, the overlapping time was shortened.     

大方坯中低碳钢连铸保护渣研制与应用

在借鉴国内外研究经验的基础上,结合攀钢中低碳钢方坯连铸工艺条件,在实验室进行了保护渣结晶与玻璃化特性协调、吸收夹杂物能力及配碳模式等方面的研究,确定了合理的渣系及物理性能、化学成分.工业试验结果表明,研制的保护渣能够满足工艺要求,可以取代进口保护渣.     

钛合金异形薄壁壳体铸造工艺数值模拟及优化

为解决钛合金精密铸造产品合格率低、试验优化周期长的问题,以某钛合金异形薄壁件为研究对象,采用逆向工程手段优化浇注系统设计。结合ProCAST有限元分析软件确定铸件缺陷分布位置,依据铸件缩松分布情况对铸造方案进行迭代优化,解决铸件承力板区域缩孔问题。根据优化结果进行生产验证,结果表明,钛合金铸件采用真空熔模铸造方案,铸件上、下端分别设置3处浇/冒口时,模拟结果显示铸件凝固过程整体温度分布合理,铸件中的缩孔均被优化剔除。该工艺方案可行性高,试制件无损检测结果与数值模拟结果吻合度高,铸件成形质量、冶金质量均达到预期效果。     

Determination of interfacial heat-transfer boundary conditions in an aluminum low-pressure permanent mold test casting

Great advances in casting modeling/simulation software have been made in the past several years. However, software predictions are only as accurate as the material and processing properties used as inputs. The process of low-pressure semipermanent mold casting is widely used by the automotive industry in the production of aluminum cylinder head castings. However, the process is highly sensitive to various casting parameters and many of the influences are not well understood. This report presents results from casting experiments and simulations using a specially designed casting, the “wing casting.” The casting experiments demonstrated the variation in temperature change in different parts of the casting for different processing parameters. Boundary conditions were determined for different areas on the mold surface and those parameters were discussed in terms of temperature sensitivity in the casting behavior. It was also demonstrated that boundary conditions play a major role in the thermal behavior in the casting during solidification. Finally, changes in the mold/casting surface geometry were found to have a large influence on the value of the boundary conditions.     

Strength of castings with cavity formation by a cylindrical rod

A mathematical model is developed for the stress state of a casting when a cavity is formed by a cylindrical rod. Formulas for the radial and azimuthal stresses and also the contact-force distribution permit prediction of the forces between the casting and the rod, with different rigidities expressed by the longitudinal elastic modulus. The stress is found to be greatest in layers of the casting in contact with the rod surface. The dependence of the radial and azimuthal stresses in the casting and the distributed contact force on various factors—the temperature gradient, the rigidity of the casting and the sand–clay casting mixture, and the geometric parameters of the casting (the wall thickness and external radius)—is considered. The influence of these factors on the stress–strain state of the casting wall—specifically, the equivalent stress obtained by means of the second strength hypothesis—is assessed.     

铜阳极板浇铸装置的设计

分析铜阳极板浇铸装置的特点、组成部分、浇铸曲线在浇铸过程中的关键性，阐述阳极板优良质量的重要意义，介绍一种铜阳极板浇铸曲线的设计方法。     

宽板坯结晶器保护渣的开发

宽板坯连铸与常规板坯连铸相比有着较大的差异.通过对保护渣理化性能、绝热保温性能的研究,确定了适合于宽板坯中碳钢连铸用保护渣的理化指标,并开发出XCN-Z型保护渣.工业应用表明:研制的XCN-Z型宽板坯连铸用保护渣使用效果好,能满足拉速为1.3～1.5 m/min的中碳钢中厚板坯连铸连轧的要求.     

钛合金异形薄壁壳体铸造工艺数值模拟及优化

为解决钛合金精密铸造产品合格率低、试验优化周期长的问题,以某钛合金异形薄壁件为研究对象,采用逆向工程手段优化浇注系统设计。结合ProCAST有限元分析软件确定铸件缺陷分布位置,依据铸件缩松分布情况对铸造方案进行迭代优化,解决铸件承力板区域缩孔问题。根据优化结果进行生产验证,结果表明,钛合金铸件采用真空熔模铸造方案,铸件上、下端分别设置3处浇/冒口时,模拟结果显示铸件凝固过程整体温度分布合理,铸件中的缩孔均被优化剔除。该工艺方案可行性高,试制件无损检测结果与数值模拟结果吻合度高,铸件成形质量、冶金质量均达到预期效果。