中厚板立辊轧机辊缝自动控制

介绍武钢中厚板分厂立辊轧机基本组成及工作原理,阐述基于西门子TDC的立辊辊缝自动控制原理(AWC),重点介绍了立辊6个液压缸的同步以及短行程控制.     

型钢连轧机组平／立转换轧机简介

介绍了世界上三种主要的平／立转换短应力线轧机的结构和特点。     

平/立可转换轧机的结构及其选用

系统介绍了平/立可转换轧机的种类、优缺点和选用原则。     

带钢生产线立轧机立辊故障分析和改进

本文对南钢带钢厂立轧机立辊存在的问题进行了简要分析,综述了立轧机立辊的改进方法及改进后的效果。     

950热轧带钢E1立辊轧机优化改进

介绍了立辊轧机的结构,针对存在的问题进行了较为详细的分析和制定了具体的优化方案。     

热带厂中轧立辊轧机机列改造

介绍杭钢热轧带钢厂中轧立辊的结构和性能,这种新颖的立式轧机采用φ500短应力线轧机装配、展开式硬齿面齿轮减速箱及快速换辊机构,实现了稳定轧制、快速换辊及年度零故障。     

万能轧机立辊断辊原因分析

通过对万能立辊的特性分析、断口分析、应力计算、过盈装配、轧辊在使用过程中的热应力计算等系列工作,得出造成辊身断裂的主要原因是:轧辊的热应力偏大,和轧制时的机械应力相叠加,超过了轧辊的强度极限,导致轧辊断裂。并给出了避免立辊断裂的主要措施。     

万能轧机的辊缝调节技术

介绍和分析了万能轧机采用的液压伺服辊缝控制（HGC）、自动厚度控制（AGC）等辊缝调节技术。这些技术为得到尺寸精度高、内外部质量好的产品提供了保证。     

中板轧机辊缝异常分析及解决办法

1　前言南钢中板厂 2 5 0 0 mm四辊可逆式中厚板轧机采用电动压下和液压压下的混合压下系统。压下系统的总速比 i=1 6.7,电动压下速度为0 .2 0 m /s。液压压下系统由“一重”设计和制造 ,其液压缸行程为 2 5 mm ,在压下过程中只对两边辊缝做微量的精确调整 ,轧制过程中辊缝主要由电动压下来实现。在 1 996年前该压下系统未出现过异常。此后一段时间内该系统在轧钢过程中时常会出现辊缝值发生变化这种不正常现象 ,使得压下工不能很好地控制厚度 ,造成“计划外”,甚至废品。一般情况下 ,在“咬钢”开始一段时间 (0～ 1 s内 ) ,两侧辊缝会增大 …     

矿渣立磨修复研究与实践

系统阐述了矿渣立磨的工作原理、内部构造及在生产过程中易发生磨损的部位,从矿渣立磨磨辊、磨盘的物理性能和材料结构入手,具体介绍立磨的修复方法,即立磨中主要部件磨辊、磨盘的堆焊方法、立磨堆焊焊丝的选择、堆焊的技术参数比较、立磨堆焊的修复工序、修复过程中需要注意的问题以及立磨修复的重要意义。并通过不断的实践摸索立磨修复最佳方案,为以后的立磨修复工作积累宝贵的技术实践经验。     

链板机故障原因分析及改进设计

通过运行和受力分析说明链板机故障原因是设计时链节安装位置不合理，提出了改进方法，为类似设备的故障处理及技术改造提供借鉴。     

平立交替凿岩爆破技术在上向水平分层尾砂胶结充填采矿法的试验应用

针对鸡笼山金矿上向水平分层充填采矿法采场中存在的切割回采顺序及凿岩爆破参数不合理、出矿效率低、采场支护量大、回采作业安全性较差等问题,在采场回采中进行了平立交替凿岩爆破技术试验.详细介绍了平立交替凿岩爆破试验采场回采工艺及作业组织.试验取得了很好的技术经济指标,对类似条件矿山开采具有借鉴作用.     

Analysis and prevention of vertical cracking phenomena during deep drawing of hot- rolled sg295 steel strips

Microscopic examination and microstructural analysis of vertical cracking phenomena in deep-drawn cups of hot-rolled SG295 steel strips were carried out in this study. Microvoids initiated preferentially at grain-boundary carbides were observed to form intergranular cracks. These grain-boundary car-bides were identified as (Fe,Mn)₃C carbides. The morphology of carbides was varied with processing variables,e.g., killing method and coiling temperature. In the Al-killed steels, the carbide shape tends to change from film type to bulk type, which may be beneficial to elongation and consequently formability. In addition, as the coiling temperature increased, the amount of banded pearlite structures and bulk-type carbides increased. These findings suggest that the deep drawability can be improved by modifying the carbide morphology in the microstructures.     

Effect of horizontal vergence on the motor and sensory components of vertical fusion

PURPOSE: To compare motor and sensory capabilities for fusion of vertical disparities at different angles of horizontal vergence in healthy humans. METHODS: Eye movements were recorded from both eyes of 12 healthy subjects using three-axis search coils. The stimulus was a cross (+) (3.4 x 3.2 degrees , vertically and horizontally, respectively) presented to each eye with a stereoscopic display. Vertical disparities were introduced by adjusting the vertical position of the cross in front of one eye. The disparity was increased in small increments (0.08 degrees ) every 8 seconds. Viewing was defined as "near" if there was a horizontal disparity that elicited 6 degrees to 15 degrees convergence, depending on the subject's capability for horizontal fusion; viewing was defined as "far" at 1 degrees convergence. Maximum motor (measured), sensory (stimulus minus motor), and total (motor plus sensory) vertical fusion were compared. RESULTS: In 9 (75%) of 12 subjects the maximum total vertical fusion was more in near than in far viewing. The three who did not show this effect had relatively weak horizontal fusion. For the entire group, the motor component differed significantly between far (mean, 1.42 degrees ) and near (mean, 2.13 degrees). Total vertical fusion capability (motor plus sensory) also differed significantly between far (mean, 1.68 degrees ) and near (mean, 2.39 degrees ). For the sensory component there was no difference between between far (mean, 0.268 degrees ) and near (mean, 0.270 degrees ). As vertical disparity increased in a single trial, however, there was a small gradual increase of the contribution of the sensory component to vertical fusion. CONCLUSIONS: Vertical fusion capability usually increases with convergence. This increase is caused primarily by an increase in the motor component. There is a gradual but small increase in the sensory component as target disparity slowly increases.     

Three-dimensional transport phenomena in chemical vapor deposition equipment: A comparison of theoretical predictions with measurements and some concepts regarding equipment design

A mathematical representation has been developed describing the velocity and concentration fields in a three-dimensional (3-D) horizontal chemical vapor deposition (CVD) reactor in the mass transfer-controlled regime. The theoretical predictions for the deposition rate were found to be in excellent agreement with measurements reported by Park and Chun. [17] A parametric study conducted examining the effects of the key process parameters has shown the following: the transport problems in horizontal CVD reactors are definitely 3-D; the concentration of the gaseous reactant at the inlet may have an important effect on the uniformity of the deposition rate; the imposition of a positive pressure gradient on the gas will improve the uniformity of the deposition rate; and the uniformity of the deposition rate may also be promoted by operating at a reduced pressure.     

Children's reconstructions of the horizontal, vertical, and oblique in the absence of a rectangular frame.

Tested the generality of the P. W. Berman et al findings (1974) which reported that children who were able to construct the horizontal and vertical had difficulty with the oblique when using a rectangular frame apparatus. Data from 24 nursery school children who produced horizontal, vertical, and oblique settings on a rod apparatus show that the comparative difficulty of the 3 settings were the same after observing the initial setting and after E spun the rod to rest at a random setting. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

浅孔留矿法平立交替控制爆破技术研究

本文介绍浅孔留矿法平立交替控制爆破新技术，该技术用于采场落矿，既安全，又有利于提高采场落矿指标，对类似矿山有实际参考价值。