提高酸洗机组碎边剪剪切效率的对策

酸洗机组碎边剪剪切效率问题一直是影响机组产能达标的主要问题,影响碎边剪剪切效率的主要原因是碎边剪刀片的侧隙不稳定。根据对碎边剪结构和侧隙调整原理的分析,针对使用中所出现的问题采取了一些有效的措施,使得碎边剪的剪切效率明显提升。     

圆盘剪剪刃崩口分析与改进

正1前言酸轧生产线圆盘剪主要功能是剪切带钢边部的不规则毛边,使带钢达到一定的宽度精度,在外型上满足用户的需求。冷轧板带厂1550连续酸轧机组圆盘剪切边生产过程中,由于废料飞边、圆盘剪间隙调整不当、刀片和胶环更换     

碎边剪常见故障分析

针对碎边剪现场应用过程中常见故障,结合碎边剪结构和剪切过程分析,通过对剪盒装配固定形式等结构改造、优化,有效地解决了碎边剪卡钢、外窜、剪盒脱落等影响剪切效率的问题,提高了剪切质量和效率。     

安钢炉卷轧机生产线圆盘剪设备改造

对影响圆盘剪剪切的因素进行了分析,提出了改造溜槽结构和加大溜槽与剪箱的连接强度、变更人口支撑梁结构和安装方式、改造碎边分料槽结构、调整磁力对中设备电磁铁标高、优化碎边剪箱体结构等具体措施,解决了圆盘剪卡钢、跑偏、溜槽断裂、碎边剪刀盘断裂、分料槽堵钢等问题,保证了圆盘剪正常剪切。     

圆盘剪剪切平行度问题的分析与对策

针对圆盘剪剪切镰刀弯问题,分析认为影响剪切平行度的因素有：夹送辊速度差、剪刃使用状态、圆盘与碎边同步性、原始板型及操作控制等。通过建立剪刃同步更换机制,优化调整夹送辊及垂直与水平刀缝,提高圆盘剪自动定位精度等,钢板镰刀弯控制水平由0.8～1mm/m提高到0～0.2mm/m。     

圆盘剪自动变速剪切过程的控制实践

韶关钢铁集团有限公司3500mm板材生产线精整线采用滚切式圆盘剪,它的功能是将厚度不大于25mm的带钢剪切成最终目标要求宽度。圆盘剪剪切工作原理是：按剪切目标宽度对中后的带钢,以设有液压夹紧装置的夹送辊为主动力,送入圆盘剪刃进行边部剪切,切下的碎边经导槽进入碎断剪进行碎断、收集。     

新型碎边机

澳大利亚Butech公司在一个新纵剪机组上安装了一组新型双轴旋转式碎边机。 这个碎边机利用有效的螺旋剪切装置,可剪切     

精整线圆盘剪和碎断剪组合机构设计

在精整机组剪切区域中,为了获得高质量的带钢边部,通常会应用圆盘剪和碎断剪组合机构来进行边部剪切及废边处理。不同的圆盘剪与碎断剪组合机构设计选型工作,可以通过对工作原理、应用局限性、制造经济性及自动化程度等方面对比和分析来实现,从而最大程度满足客户对废边处理方式的不同要求。文中通过对不同组合机构的整体结构分析,阐述了不同装置在实际应用中的性能优势特点及局限性:圆盘剪、碎断剪一体式机构结构紧凑,占地空间小,适用于产线速度低、厚度大或强度高的废边处理工况;圆盘剪、碎断剪分体式机构占地空间大、制造成本高,可以选择废边卷球或废边碎断的处理方式;圆盘剪、碎断剪、废边转向辊一体式机构结构紧凑、制造成本低,可以选择废边卷球或废边碎断的处理方式。     

碎边剪的结构与参数设计

阐述了碎边剪的剪切原理、设备组成、主要技术参数和结构特点.在实践应用中,设备使用效果良好,碎边质量高,满足设备设计要求.     

酸洗机组的拖动圆盘剪和飞剪式碎边剪介绍

拖动圆盘剪和飞剪式碎边剪安装在酸洗机组的出口端(即尾部)。其主要作用是切下带钢的边部(即消除热轧带钢的边部缺陷),并将废边切成小块,然后运送到车间外面。其辅助设备还有:废边导槽,其任务是将从圆盘剪切下来的废边准确地引向碎边剪的刀刃位置;碎边溜槽,其作用是将碎块汇入皮带运输机内;碎块运输机,其任务是把碎边剪切堆积起来的废块运送到车间外部的废料筐和火车箱内。如图1所示:     

Tissue actions of bipolar scissors compared with monopolar devices

OBJECTIVES: To establish whether bipolar scissors offer equivalent cutting performance compared with monopolar scissors and to compare extent of thermal coagulation injury using two electrosurgical generators. DESIGN: Eighteen female rabbits' uterine horns were cut using controlled velocity at several different wattages with either bipolar or monopolar scissors. The specimens were examined microscopically and zones of thermal necrosis were measured using a stage micrometer against a 1 mm standard. RESULTS: Bipolar scissors cut equally well compared with monopolar scissors and showed significantly less thermal injury. When coupled to a constant voltage generator both the bipolar and monopolar scissors performed better. CONCLUSION: Bipolar scissors offer the surgeon significant safety advantages and equivalent or better performance compared with monopolar scissors when used for laparoscopic surgery.     

滚切式双边剪的改造

新钢公司3 800 mm厚板工程,为节约投资,对引进国外的滚切式双边剪二手设备,在设备电气控制、导轨、传动装置等进行了相应的维修和改造,取得了与新设备同样的效果,满足了生产的需要.     

圆盘飞剪主要参数的设计及其计算方法初探

详细介绍了圆盘式飞剪各主要参数的确定、包括交角、咬入条件、剪刃重叠量，摩擦系数、轧制速度等。结合实践，纠正了１９８３年版本《线材生产》一书中的部分错误内容。     

Pattern formation in the imaginal wing disc of Drosophila melanogaster: fate map, regeneration and duplication

Fragments of the wing disc of Drosophila (fig. 2) were either injected into mature third instar larvae for immediate metamorphosis, or cultured in adult abdomens for seven days before being transferred to larvae for metamorphosis. The structures differentiated during metamorphosis were then analysed. The results of the first series of experiments were used to construct an accurate fate map of the disc, and those of the second series were used to determine the regenerative properties of the disc. The fate map (fig. 7) shows presumptive proximal parts (notum, pleura, and dorsal and ventral hinge) at the two ends of the disc, with presumptive distal wing parts in between. During metamorphosis the disc epithelium folds upon itself along the presumptive wing border, bringing dorsal and ventral wing and hinge surfaces into apposition. The wing surfaces occupy a much smaller relative area, and the hinge parts a much larger relative area, in the fate map than in the adult structure. The cultured fragments, in general, behaved in accordance with the rule that when two cut surfaces are created by cutting across the disc, regeneration occurs from one of the cut surfaces and duplication occurs from the other (fig. 14). It was possible to define a level in the longitudinal axis of the disc from which regeneration proceeds outwards. Cut surfaces facing away from this level show regeneration, while cut surfaces facing this level undergo duplication. Similar behavior was found for the transverse axis, and for two diagonal series of cuts. Some fragments with two cut edges could regenerate from one edge while duplicating from the other, whereas others could regenerate from two cut edges simultaneously. However, fragments with four cut edges showed incomplete regeneration, and a high tendency to duplicate even though regeneration in all directions might have been expected on the basis of the other experiments.     

柱锤强夯置换在块石填土地基处理中的应用

在基础方案比选的基础上，介绍了柱锤强夯置换技术在某大型冶炼厂电解车间块石填土地基处理中的应用，试夯后的现场荷载实验结果高于设计要求，表明柱锤强夯置换法具有一定的可靠性和经济性，有良好的应用价值。     

转炉柔性螺栓替代性改造与分析

柔性螺栓是DEMAG公司制造的某炼钢厂转炉中连接托圈和炉壳的非常重要的联结装置。由于在生产过程中几束柔性螺栓突然断脱,失去联接功能,又无备品及时更换,决定采用刚性联接螺栓替代柔性螺栓。对替代的刚性联接螺栓进行了分析、设计验算。经生产使用证明此改造措施是可行的。     

用人工隔离墙代替胶结充填新工艺

阐述了用人工隔离墙的水平分层进路充填法取代胶结充填法目的 ,阐明了人工隔离墙的作用、结构、施工方法以及技术经济分析 ,评价了人工隔离墙的水平分层进路充填法及在该矿实用价值     

双边剪夹送辊装置的调整

本文介绍韶钢中板厂滚切式双边剪系统目前存在的一些问题，详细分析了该系统的夹送辊装置的安装、调整对中板切边质量的影响，并提出了相应的改进措施。改进措施实施后，效果良好。     

冷轧精整机组擦划伤成因分析

分析了本钢冷轧厂精整机组擦划伤的形成原因,是同平整工序的卷取张力以及精整机组的来料厚度、运行速度、张力、切边质量、矫直机调节有关。通过对相关因素的讨论,找出了实际生产中解决擦划伤问题的方法。