斜轧穿孔机轧辊辗轧锥角的设计分析

斜轧穿孔机轧辊形状设计十分重要，其中辗轧锥角的正确设计是获得高精度壁厚的关键。通过对斜轧时产生非线性变形区的理论分析，根据管壁辗轧时轧辊与顶头间应保持相等间隙的原理，推导出了设计轧辊辗轧锥角的计算公式，计算结果与德方向无缝钢管厂提供的参数吻合。     

钢管斜轧延伸工艺参数模拟与辗轧角优化

基于建立的斜轧延伸机轧辊速度模型，模拟分析了沿轧制方向和螺旋方向上辗轧角对轧辊速度、局部送进角、局部角速度的影响，进而分析了这些参数对金属变形和流动的影响，据此可优化辗轧角。     

钽合金零件的摆辗成形工艺

钽合金具有高密度、耐高温、强度高和良好的加工性能、断裂韧性、耐蚀性等优点,是航空、航天、化工、核工业、高温技术等领域不可缺少的重要材料,具有很好的应用前景.研究了摆辗成形钽合金零件的方法,讨论了摆角、摆辗时间等参数对摆辗成形的影响,分析了摆辗成形时出现壁厚尺寸偏差和折叠缺陷的原因,同时也提出了相应的解决措施.     

摆辗变形参数的测量原理及摩擦系数的测定

摆动辗压过程中,工件作用在模具上力参数的大小,随着工艺参数,如工件的初始高径比,每转进给量、润滑状态的不同而异.为深入研究摆辗变形的规律,就须对该力参数的变化进行测量.本文主要叙述了其测量原理,并设计了实验装置,对摆辗过程中的工件与模具间的摩擦系数进行了初步测量,结果表明,对圆柱形铅试件摆辗变形,采用机油润滑时摩擦系数约为0.084;采用硅油石墨润滑时.摩擦系数约为0.031;无润滑剂时,摩擦系数约为0.355～0.397.     

摆辗机力能参数研究

介绍了摆动辗压工艺原理及基本特征。通过对摆辗力的实测实验找出摆辗力的分布规律。并根据此实验分析摆动辗压变形的两个阶段及摆辗力的分布特征，为今后摆辗机的理沦研究和结构设计提供依据。     

大型环件热辗扩数值模拟与实验研究

针对应用广泛的大型矩形截面环件，采用DEFORM-3D有限元软件分别选取不同摩擦系数、进给速度，对其辗扩过程进行数值模拟，并进行加工实验，找出了工艺参数的选取范围，分析了轧制过程中产生的问题和缺陷，为实际生产提供了依据。     

钢锭形状和尺寸对重轨表面质量的影响

通常对重轨表面质量要求较严。重轨钢坯一般是不进行清理的,但成品重轨尽可能进行清理则是标准的起码要求。因此,轧制工艺的效果(表面加工度和表面缺陷辗平度)对重轨表面质量就有重大的意义。在制定连铸板坯轧制重轨的工艺时,对轧制过程中表面缺陷的辗平度进行了专门的研究。在生产条件下以不同参数轧制试验钢,评价不同工艺参数对成品表面质量     

锥辊辗轧理论研究的进展

锥辊辗轧理论的研究开拓了带材轧制和随后深加工的新领域。它利用楔形轧制和异步轧制的若干特点，以构成一个新的轧制过程，提供了高效，低耗和柔性加工钢带和螺旋叶片的可能性和现实性。本文对钢带锥辊异步冷辗轧，螺旋叶片锥辊冷辗轧等程的理论研究作一较详细的阐述。以推进这方面的研究。     

摆辗机成形工件最佳半径的理论分析

摆动辗压成形是一种新的压力加工工艺，采用该工艺十分省力。通过理论分析，得出摆辗机所适宜加工成形零件的半径范围，对摆辗机的设计和应用起到一定的指导作用。     

H型钢轧边—万能连轧过程综合实验研究

在三机架可逆连轧实验机组上，对Ｈ型钢的轧边—万能连轧过程进行了综合实验研究，探讨了轧辊线速度不平衡对连轧张力，连轧张力对前滑、翼缘宽展、力能参数的影响规律，得到了一系列轧边—万能连轧工艺资料，对Ｈ型钢的轧边—万能连轧工艺参数设计、自动控制系统连轧数学模型的建立以及轧机设计具有重要的参考价值。     

一种立辊轧机工作辊锁紧装置的应用实践

介绍了韶钢热轧宽板厂立辊轧机工作辊锁紧原理、工作辊锁紧故障解决方案及工作辊更换方法。     

25mm7A09厚板心部裂纹成因分析

25mm7A09厚板边部区域沿厚度方向中心部位产生小裂口，小裂口的产生非铸锭冶金缺陷引起的。这是由于轧制初期板材心部存在低塑性铸态组织，在此情况下板材进行滚边处理，滚边量过大导致板材边部出现内部开裂。为了消除此类小裂口，热轧时应控制铸锭加热温度，合理分配道次压下量及控制滚边时机和滚边量。     

立辊侧压量优化策略在提高中厚板成材率中的应用

分析了在中厚板轧制展宽阶段和精轧阶段不同的展宽比和伸长率对宽度偏差及切头尾长度的影响,提出了针对不同的展宽比和伸长率条件下的立辊压下量优化方法,以产品长宽比等于10.26为临界点确定得到一个最小切损量的最优立辊压下量。实际应用表明,该方法可将产品的切损率降低15%以上,大大提高了中厚板产品的成材率。     

Comparisons of the ski turn techniques of experienced and intermediate skiers

We compared selected kinematic variables for four different ski turn techniques performed by five experienced and five intermediate male skiers. The four ski turn techniques were the upstem turn, the downstem turn, the parallel turn and the parallel step turn. Each turn was divided into the initiation phase and the first and second steering phases. Most of the statistically significant differences (P < 0.05) between the two groups were found for the initiation phases of the four turns. Both the hip axis-hand axis angle and the edging angle of the uphill ski were significantly different between the two groups for the upstem turn at the beginning of the initiation phase. For the downstem turn, significant differences between the groups were found at the start of the initiation phase for the hip axis-hand axis angle, the shoulder axis-fall line angle, and the edging angle of the uphill ski. The standard deviation of the distance between the tips of the two skis over the second steering phase also differed significantly between the two groups. For the parallel step turn, significant differences were found at the start of the initiation phase for the edging angle of the downhill ski and the downhill ski to movement direction angle. Significant differences were also found for the edging angle of the downhill ski in the middle of the second steering phase and the shoulder axis to movement direction angle at the end of this phase. For the initiation phase of the parallel turn, significant differences were found for the timing of setting the ski pole, the uphill knee angle at the start of this phase and the range of the knee angle of the uphill leg from the start to the end of this phase. For this turn, significant differences between the two groups were also found for the edging angle of the downhill ski in the middle of the second steering phase and the shoulder axis to movement direction angle at the end of this phase. One of the reasons it was possible to identify a few significant differences only for the turns analysed, was the variability within the intermediate group: for most of the variables analysed, the standard deviation was much higher for the intermediate than for the experienced group.     

2250mm热连轧立辊轧机AWC液压控制系统的改进

分析了邯钢邯宝钢铁有限公司2250mm热连轧生产线立辊轧机AWC液压控制系统存在的问题,并对存在的问题进行了改进,取得了较好效果。     

11号矿用工字钢轧制工艺研究

介绍了攀钢轨梁万能生产线生产11号矿用工字钢的孔型设计步骤、方法及主要工艺技术参数的选取,重点介绍了BD机孔型系统的选取、万能水平辊及轧边机轧辊主要尺寸的确定.     

Optimisation of edging amount for high accuracy plan view control in plate mill

Algorithm to optimise the edging amount for high accuracy plan view control has been developed to improve plate yield. To produce rectangular shape of rolled plate, the edging amount that can minimise the crop length and width deviation must be determined from the operational analysis of plate mill. For the plan view control, new mathematical models to predict crop length at the top and bottom ends and width deviation at side ends are developed on the basis of statistics and back propagation learning algorithm of neural network. Using new mathematical models, under given rolling conditions of broadside and finishing pass and the permissible tolerance in width deviation, optimised algorithm which can achieve high accuracy plan view pattern is proposed. The application of newly developed algorithm in actual plate mill for plan view pattern control reduced width deviation by 20%, and crop length by 30% on average with a suitable fishtail crop shape.     

热轧带钢头尾形状短行程控制研究

采用刚塑性有限元法建立立辊调宽和随后平轧宽展过程的三维热应力耦合模型 ,对宝钢 2 0 5 0热粗轧机组带钢的头尾形状短行程控制 (SSC)进行了研究。通过分析各种压下制度下的头尾部失宽规律 ,建立了立轧带钢头尾部短行程控制模型。对比宝钢现场采用的短行程模型和研究所取得的新模型可以看出 ,新的短行程控制模型对头尾部形状有更好的改善作用。     

7A09合金厚板心部裂纹成因分析

7A09合金厚板边部区域沿厚度方向中心部位产生小裂口，小裂口的产生非铸锭冶金缺陷引起的。这是由于轧制初期板材心部存在低塑性铸态组织，在此情况下板材进行滚边处理，滚边量过大导致板材边部出现内部开裂。为了消除此类小裂口，热轧时应控制铸锭加热温度，合理分配道次压下量及控制滚边时机和滚边量。     

56#角钢立轧和切分孔型系统改进

介绍了56#角钢原立轧孔和切分孔设计方面存在的问题,新改进孔型的设计内容,解决了56#角钢生产过程中质量不稳、产量低的实际问题,改进效果明显.