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孔哲 《冶金设备管理与维修》2013,(2):47-53,56
文章结合酒钢高速线材生产实际,提出了孔型设计的方法、粗中轧轧制程序表,并采用刚塑性有限元法对粗中轧过程进行了模拟分析,提出了相关的量能与变形参数。 相似文献
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Conny Eriksson 《国际钢铁研究》2004,75(12):818-828
Surface defects in wire rod and bar rolling are common and well‐known to mill people. Nowadays, surface defects are not accepted on high‐alloyed steel wire rods. The steel making, casting and rolling processes give rise to defects. Also, the final handling of the wire and bar can destroy the surface. In this work, artificial V‐shaped cracks in the longitudinal direction were investigated for different reduction series. The false round‐oval series are known as a series for high quality steels and are usually better than square–oval series. Experiments confirmed that in the false round‐oval sequences a surface crack in the groove bottom may open up during rolling at the same time as its depth is reduced, which is a beneficial situation. Surface cracks found at 45° to the rolling direction, at groove “corners” and on free surfaces will be closed or reduced in depth. The closing of cracks is detrimental since the cracks usually hide rolled‐in oxides beneath the bar surface. The experiments showed that for the subsequent oval–false round sequence the visible crack at the groove bottom will be closed and become shallower. The cracks at 45° and on the free sides will also be closed, but deeper causing a serious surface defect. An FE‐analysis was carried out, explaining the experimental results. Flat oval grooves are better than round ovals and false rounds are superior to square for opening and decreasing the depth of a longitudinal crack. It is difficult to eliminate a surface defect constituting a closed crack. 相似文献
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Defects are often present in rolled products, such as wire rod. The market demand for wire rod without any defects has increased. In the final wire rod products, defects originating from steel making, casting, pre‐rolling of billets and during wire rod rolling can appear. In this work, artificial V‐shaped longitudinal surface cracks have been analysed experimentally and by means of FEM. The results indicate that the experiments and FEM calculations show the same tendency except in two cases, where instability due to fairly “round” false round bars disturbed the experiment. FE studies in combination with practical experiments are necessary in order to understand the behaviour of the material flows in the groove and to explain whether the crack will open up as a V‐shape or if it will be closed as an I‐shape. 相似文献
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安钢高线机组的高速区布置与传统的10机架不同,为8+4布置,其工艺技术水平达到了世界先进水平,本文介绍了安钢高线机组在精轧机组孔型系统优化方面的成绩。 相似文献
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T.H.Austen 《钢铁》2004,39(10):50-53
利用闪光焊接设备对钢坯进行焊接,使棒线材轧机得以不间断生产,提高了产品质量和生产率,同时降低了生产成本。描述了钢坯对焊设备,重点介绍了焊接工艺和质量。 相似文献
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以850 mm四辊热连轧机组为研究对象,建立了轧辊辊间接触压力和板形计算模型,以均匀辊间接触压力分布和带钢板形良好为目标,对热连轧机精轧机组支承辊辊型曲线进行了多目标优化设计。理论计算表明,优化后的支承辊辊型曲线均匀了辊间接触压力分布,降低了辊端接触压力峰值,同时能够提高弯辊力对板形的控制效果。工业生产试验后正式推广使用,支承辊掉肩和掉肉现象得到了有效遏制,带钢板形良好。 相似文献
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在生产特殊钢线材轧机上应用达涅利摩加沙玛公司的一项新技术,即双模块机组(TMB),生产能力平均提高10%,最终产品具有更好的技术性能。 相似文献
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介绍了棒线材短应力线轧机中常用的几种接轴托架结构形式,通过对各形式结构特点的分析对比,总结出每种形式接轴托架的优缺点,为棒线材轧机合理配置接轴托架形式提供技术参考。 相似文献
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介绍了八钢为实现合理产品分工,改造老系统,新建起点较高的全国产化的棒材高线生产线的设计布局、工艺流程、主要车间工艺参数、主要工艺和设备特点。新线建设为自行设计,投资低、工期短,且根据生产实践应用新技术对棒材生产线进行了优化设计,产能水平大幅提高,可为类似工程建设提供参考。 相似文献
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宝钢分公司线材轧机产品的设计规格范围为φ5.0~25.0.目前市场上对φ25.0以上大规格冷镦钢需求稳定增长,为了满足市场对更大规格产品的需求,考虑了宝钢分公司线材轧机的工艺条件和设备能力后,在不添置设备的前提下,对生产φ26.0系列产品进行了研究. 相似文献
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在生产特殊钢线材轧机上应用达涅利摩加沙玛公司的一项新技术,即双模块机组(TMB),生产能力平均提高10%,最终产品具有更好的技术性能。 相似文献
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高速线材生产线的活套,在套辊结构、润滑方式等方面都存在诸多不当之处,为此进行了多项改进,使活套故障明显减少,活套套辊及压辊寿命明显延长,大大节约了生产成本。 相似文献
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根据钢管冷斜轧过程的变形特点,建立了辊型设计系统。把辊型设计的结果作为初始参数,由刚塑性有限元分析成型过程,将速度场、应变和应力反馈到辊型设计系统,调整辊型设计的初始参数,绘制出适应钢管冷斜轧工艺要求辊型图。 相似文献