板坯SP调宽用新型侧压模块的研究

针对热轧厂SP侧压调宽后出现板形不良而造成热轧成材率下降的问题,提出采用新型双斜面侧压模块以改善SP侧压后的板坯形状、降低板坯的尾部翘曲。有限元数值模拟与实验的研究结果表明:采用新型双斜面模块调宽后,板坯中部的狗骨峰值有较大程度的降低,其狗骨的最大高度值小于目前热轧厂普遍使用的单斜面模块,而宽度方向上中心部位的厚度大于单斜面模块;同时,双斜面模块的调宽效率高于单斜面模块;相同变形条件下,经单斜面模块侧压后的板坯尾部翘曲程度大,双斜面模块能够明显减小SP侧压后的板坯尾部翘曲,采用双斜面模块可以改善板坯SP侧压后的板形。     

Sizing Stormwater Infiltration Structures

A design aid is presented for sizing stormwater infiltration structures. The proposed procedure is based on the hydrological storage equation for an infiltration structure coupled with the Green and Ampt infiltration equation. For the filling process, the two equations are solved simultaneously using a numerical method, and the results are presented in chart form. These charts are useful to determine the maximum water depth in an infiltration structure. For the emptying process, the governing equations are integrated analytically resulting in an algebraic equation that can be solved for the emptying time explicitly. A practical application is included to demonstrate the ease of the suggested procedure.     

EIC自动化控制系统的Right—Sizing技术

在Ｄｏｗｎ－Ｓｉｚｉｎｇ，低成本和开放性成为ＥＩＣ控制系统的发展潮流的当今世界，大小，新旧ＥＩＣ控制系统产品并存。在新建或改造一个自动化控制系统过程中，采用文中介绍的Ｒｉｇｈｔ－Ｓｉｚｉｎｇ技术，可最适化配置好一个工业自动化控制系统，实现低成本和高ＲＡＳ性能的目标。     

SP 轧机模块锁紧装置改进

1580的SP轧机模块锁紧装置采用液压控制形式,在轧钢状态时利用液压力对模块进行锁紧,该处工况复杂,距离钢坯较近,非常容易发生油缸漏油甚至火灾事故,对生产产生较大影响,经过对该锁紧装置分析,对结构进行改进,提出采用蝶形弹簧形式的锁紧缸,并进行相关分析、计算和设计。应用后可以有效的避免油缸漏油、火灾等事故的发生,保证生产的稳定运行。     

提高棒材定尺率的优化改造措施

山钢股份莱芜分公司针对半连轧棒材生产线钢材定尺率低的现状,采取了系列优化改进措施:经过计算确定了坯料的长度及切头、切尾长度,控制钢坯开轧温度,改用液压缸直接驱动锯体横移和设计安装活动锯口对热锯机进行改造等,在保证成材率稳定的前提下,钢材定尺率由15%提高至98%,热锯定尺精度可控制在30 mm之内。     

SP轧机运动状态分析

以上海宝钢1580热轧线上的SP定宽机为例,对SP轧机侧压模块的运动规律进行了理论分析与试验研究,给出了侧压模块的运动方程,计算了侧压模块的运动规律。通过对侧压模块运动状态的实测,分析了操作侧与传动侧侧压模块的同步关系、侧压机构与同步机构的相位关系及空载与轧制状态模块的动态特性。由试验结果可发现设备存在的问题,为设备维护与检修提供了依据。     

新型钢管管端定径机

介绍了Ф400新型钢管管端定径机的工作原理及结构特点。该设备具有定径精度高、结构简单、工作效率高、造价低等特点。     

三辊定径机架中心位置研究

轧制线是轧钢工艺的主要参数,三辊定径机架中心是保证轧制线的前提条件,经KRI75数控机床定位检验孔型位置,确保轧制工艺要求.     

三辊定径机架中心位置研究

轧制线是轧钢工艺的主要参数，三辊定径机架中心是保证轧制线的前提条件，经KRI75数控机床定位检验孔型位置，确保轧制工艺要求。     

大型进口风机的设计选型及应用

介绍了进口风机的结构特点，列举了设计选型的实例，分析了风机效率影响因素，指出选用进口风机需要考虑的因素。     

Image-Based System for Particle Counting and Sizing

A procedure is developed to provide measurements of particle size by adapting parts of a commercially available particle image velocimetry system to obtain in situ digital images of the particles. The procedure is nonintrusive and is able to capture images of the particles as they are mixed, thus avoiding the need for disturbing the flow or withdrawing samples for later analysis. Measured size distributions are shown to compare closely with manufacturer's values for standard polystyrene spherical particles, and particles with diameters as small as 6 μm are resolved. The system also is shown to track changes in particle-size distribution during an aggregation test. In addition, information on particle geometry is obtained, which should be useful for improving the ability to model aggregation processes. A simple modeling framework based on the Smoluchowski equation is presented to demonstrate the use of data obtained with this procedure in particle aggregation modeling.     

1880压力调宽机砧型的改造研究

针对压力调宽机在轧制连铸坯时出现的夹送辊输送打滑现象,运用有限元软件DEFORM建立某钢厂1880SSP压力调宽机定宽轧制模型。将模拟结果与理论计算对比,找出了打滑的主要原因是"狗骨"变形纵向高度差值过大。通过对砧型3个阶段的研究,提出新的砧型,使生成的"狗骨"变形满足夹送辊输送时的咬入条件,并进行了试验得到了验证。     

大型进口风机的设计选型及应用

介绍了进口风机的结构特点,列举了设计选型的实例,分析了风机效率影响因素,指出选用进口风机需要考虑的因素。     

Graphical Sizing of Small Single-Outlet Detention Basins in the Semiarid Southwest

A graphical procedure is presented for sizing single-outlet detention basins to control stormwater runoff from small catchments in the semiarid southwestern United States. The approach relies on the modified rational method to provide the catchment runoff hydrograph, a linearized relation between basin water depth and storage volume, and a rainfall-intensity-duration equation for which coefficients can be found easily for any location covered by NOAA Atlas 14, Volume 1 (Arizona, Southeast California, Nevada, New Mexico, and Utah). Numerical solutions of a dimensionless form of the differential detention storage continuity equation are carried out, and solution values are related to a dimensionless discharge coefficient that provides a comprehensive characterization of catchment hydrology, outlet structure type and size, and regional precipitation. Graphs that supply dimensionless values of the maximum peak outflow rate from a basin, the maximum storage volume, and the critical storm duration (that is, the storm duration that produces the peak outflow and maximum storage volume) are prepared from the numerical solutions. The method avoids repetitive calculations and provides accurate solutions rapidly in an uncomplicated way for small catchments of about 12 ha or less with times of concentration less than about 30 min.     

IHI定宽压力机的运动学分析

应用解析法建立了ＩＨＩ定宽压力机运动的数学模型，并对它的运动学进行了研究。结果表明：ＩＨＩ定宽压力机的机构设计是合理的，但还存在一些问题。     

定径机机架加工及检测方法探析

文章介绍了定径机机架的加工工艺及采用加工中心机床和常规百分表相结合对机架进行检测的方法。机架的成功加工为下一步制作其它型号的机架提供了依据,且具有较好的市场发展前景。