高速钢复合轧辊液固结合过程数值模拟

在试验的基础上,建立了高速钢复合轧辊铸造过程中外层高速钢钢液充型湍流流动及辊芯和外层高速钢液固结合时的三维速度场和温度场的计算模型,模拟了辊芯预热温度对凝固及界面结合情况的影响。结果表明,高速钢钢液在铸型中是从下到上、从两侧的交界面向中间顺序凝固的,但随着辊芯表面预热温度的不同,呈现出不同的特点。在同一截面上,当预热温度较低时,其最后凝固的位置位于工作层金属中间的某一位置,当预热温度较高时,最后凝固的位置位于工作层金属和辊芯之间的界面上。预热温度较低时,两者之间将难以形成冶金结合,预热温度适宜时,两者之间可以形成良好的冶金结合,适宜的辊芯预热温度为1100~1200℃。     

分析轧件流动速度的刚塑性边界单元法

边界单元法作为一种数值方法，具有降低维数、减小计算量及计算精度高等特点，非常适合于有塑性变形问题的分析。本文建立了刚塑性边界单元法，并用该方法计算了平板轧制中轧件的流动速度，验证了中性面的存在，从而证明该方法是有效的。     

拉力芯棒在二辊斜轧延伸中的应用

介绍了在二辊斜轧延伸中采用拉力芯棒轧制的新工艺。探讨了拉力芯棒轧制与固定芯棒轧制、浮动芯棒轧制和限动芯棒轧制相比所显示的优越性。实践表明，采用拉力芯棒轧制方式，可以轧制薄壁管，提高产品尺寸精度和内表面质量。     

自动轧管机组的计算机软件系统

介绍了自动轧管机组计算机软件系统的功能与结构、硬件与软件的配置。分析了穿孔轧制压力的数学模型。     

冷轧轧制油特性的探讨

本文介绍了窄带钢冷轧机组在现场生产中,使用乳化状轧制油遇到的一些情况,同时讨论了冷轧轧制油的几个工艺特性及理化指标。     

基于西门子PLC的ACCU轧机基础自动化系统设计与开发

该文介绍攀成钢180ACCU轧管机的基础自动化系统设计与开发,该系统采用基于西门子S7—400PLC的解决方案。文中描述了该轧管机组的工艺流程和控制系统的功能需求,并从系统选型、系统结构及软硬件配置、应用软件开发和功能特点等方面进行了详细阐述。该方案对同类型轧管机控制系统的设计与开发具有较高的参考价值。     

能耗曲线在带钢热连轧负荷分配控制中的应用

主要介绍了带钢热连轧厚度控制中采用能耗曲线的方法,对轧机的负荷分配进行分析和设计,详细论述了能耗曲线的建立过程以及运用于实际生产过程中的轧制力分配和辊缝分配的控制方案,并给出了它们各自具体的控制原理、计算公式以及程序框图。该负荷分配方法用于在线,有较好的使用效果。     

Wire + Arc Additive Manufacturing

Depositing large components (>10?kg) in titanium, aluminium, steel and other metals is possible using Wire + Arc Additive Manufacturing. This technology adopts arc welding tools and wire as feedstock for additive manufacturing purposes. High deposition rates, low material and equipment costs, and good structural integrity make Wire+Arc Additive Manufacturing a suitable candidate for replacing the current method of manufacturing from solid billets or large forgings, especially with regards to low and medium complexity parts. A variety of components have been successfully manufactured with this process, including Ti–6Al–4V spars and landing gear assemblies, aluminium wing ribs, steel wind tunnel models and cones. Strategies on how to manage residual stress, improve mechanical properties and eliminate defects such as porosity are suggested. Finally, the benefits of non-destructive testing, online monitoring and in situ machining are discussed.     

Rolling texture and its effect on tensile property of a near-α titanium alloy Ti60 plate

Rolling texture and its effect on tensile properties of Ti60 alloy plates were investigated in the present study. The plates wereβ-rolled at 1070℃ and(α+β)-rolled at 980℃, using uni-directionally rolling(UDR) and cross-directionally rolling(CDR) processes, respectively.β-rolled plates exhibited weak textures, which were attributed to the dispersive orientations of secondary α during the β→α phase transformation. Strong deformation textures formed in(α+β)-rolled plates as a result of slipping mechanisms: the strong T-type texture in UDR plate was related to {10 1 0}[11 2 0] slipping, while the B-type texture in CDR plate was relevant with {0001}[11 2 0] slip. Strong T-type textures led to anisotropic tensile properties. B-type textures would decrease such an anisotropy. The(α+β)-CDR process was found to be a candidate process for reducing anisotropy of Ti60 alloy plates.     

ORACLE数据库在大H型钢轧线二级系统中的应用

该文阐述了ORACLE数据库的特点及其访问方式,并介绍了ORACLE数据库及其所带的Form,Reports在开发大H型钢轧线二级系统中的应用。