热轧带钢挫伤缺陷的分析与控制

介绍了热轧带钢挫伤缺陷的形貌特征与分布规律;分析了薄规格产品平整挫伤缺陷产生的原因,认为带钢层与层之间存在间隙,在开卷张力作用下,层与层相对滑动,是造成平整挫伤的根本原因。通过优化板形、增加卷取张力和降低平整开卷张力加速度等措施,有效解决了平整挫伤问题。     

热轧板带厂1450平整线拓宽改造

<正>1前言热轧板带厂1450平整线于2013-08建成投产,机组具有正负弯辊功能,能平整温度60℃的碳素钢及低合金薄规格钢板,改善板形,消除局部的厚度超差,提高表面质量。1450平整线由开卷机、矫直机、平整机、分切剪机、卷取机组成,设计平整宽度范围为800~1350mm的钢卷,对于宽度1370~1405 mm集装箱板只能在2032平整线平整,由于2032平整线平整的钢卷会产生卷形不良、卷芯翘头、头尾部划伤等质量缺陷,因此,热轧板带厂组织改造提高1450平整线平整宽度范围。     

开卷机张力增大方案研究

主要介绍1780mm热轧不锈钢平整机组开卷机张力增大的方案探讨和研究,通过理论核算、实践验证,在有效利用原件的基础上,采用电机功率增大实现张力增大的效果,具有安全性高、效率高、成本低等优点,可在搬迁改造工程项目中推广借鉴。     

平整机组轧制宽度拓展改造

<正>1前言冷轧板带厂1 250 mm平整机组为单机架四辊平整机,主要由开卷机、入口张力辊系、入口液压剪、入口测张辊及压辊、防皱辊、工作辊及支撑辊、防颤辊、出口测张辊系、出口液压剪、出口张力辊及压辊、卷取机等设备组成,设计轧制带钢最大宽度为1 100 mm。其开卷机和卷取机芯轴长度可以轧制宽度为1 380 mm的带钢,但是机组张力辊、测张辊及压辊、工作     

平整机组钢卷卷径计算方法及优化应用

钢卷卷径计算在平整机组控制中较为重要,卷径计算的准确性直接影响开卷机和卷取机的速度控制、张力控制的稳定性,进而影响带钢的表面质量和生产效率。为此,分析了几种常用卷径计算方法的优缺点,并结合实际案例给出适合的计算方法,同时通过优化控制程序,很大程度提高了开卷机和卷取机卷径的计算精度。     

梅钢重卷机组开卷机控制分析

冷轧开卷机的控制主要是保证开卷机速度的快速响应以及带钢张力的恒定,通过速度控制模式和张力控制模式,可实现以上功能,主要对梅钢1420mm冷轧重卷机组开卷机的控制进行了分析。     

宝钢1580热轧平整线开卷机卷筒的国产化研制

开卷机卷筒是开卷机的核心部件,卷筒必须能够顺利上卷,并且在卷筒对中后,在较大的张力下平稳地完成钢卷的开卷和卸卷动作,以利于整个机组对开卷后的带钢进行平整作业.就宝钢分公司1580热轧平整线开卷机卷筒的工作原理及基本参数、卷筒径向压力计算、扇形板材料选用、扇形板加工工艺过程控制等部分进行了介绍.该卷筒的国产化是宝钢进口卷筒设备逐渐走向国产化的一个开始,如研制成功,将对该类型设备的国产化具有重要意义,一方面可提升国内研制厂家的研制能力、提升制造业的技术水平,同时也为宝钢和国家节约大量外汇.     

冷轧钢带折印缺陷控制技术研究

泰钢冷乳部1700平整机在生产冷乳钢带的过程中,针对乳机板形不良、平整机因开卷机和入口S辊的位置不当、钢带在入口S辊上受力不均、退火钢卷粘结造成折印缺陷的原因,通过采取提高轧机板形质量、将开卷机由内八型调整为外八型,对S辊进行优化,对平整工艺参数优化等措施,有效降低了冷轧钢带折印缺陷率,折印缺陷降级率由实施前0.81%降低到实施后的0.21%,成效明显。     

热轧酸洗板缺陷分析与控制

酸洗板以优质的热轧板卷为原料,经平整、酸洗、涂油后直接用于冲压成型,是热轧板和冷轧板之间的中间产品,具有较高的经济效益。介绍了热轧酸洗板的凹坑、挫伤、翘皮、划伤等主要缺陷,通过调整平整机开卷张力、打包方式等措施,热轧酸洗板的成材率达到98.8%。     

热轧平整机组挫伤缺陷控制的研讨

热轧平整机组主要针对常温下的耐候钢、冷轧料及马口铁等低强度的薄规格产品进行平整作业,以提高其表面质量、改善板形及力学性能等。但在生产过程中由于原料卷内圈松卷问题,易造成带钢中、尾部出现不同程度的挫伤缺陷,对带钢表面质量造成影响。主要介绍了热轧带钢挫伤缺陷的形貌特征与分布规律,通过研究挫伤产生的规律、设备功能的优化及固化操作人员的操作习惯等几个方面提出改进方案,达到了消除挫伤缺陷的目的。     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

Comparison of the results of surgical and conservative treatment of fractures of the diaphysis of the tibia

In this paper is treated the fundamental problematic of the fracture of the diaphysis of the tibia and the therapeutic results after the conservative and operative treatment are confronted. Among 518 patients with 433 open fractures and 35 with closed fractures of the diaphysis of the tibia, successful treatment of more 2/3 was obtained in the period from 1968 to 1972. Following our casuistics and literature, whose results are similar, we find out that the average total treatment of the osteosynthesis of the fracture of the diaphysis was shortened for 2,5 months depending upon the type and the localisation of the fracture. Apolied methods of the operative and conservative and conservative treatment in relation to the velocity of the medical cure as well as to the extreme anatomical-functional results are analised. We noticed that osteosynthesis, made by the intermedullary nail and the extension of the canals or by a small AO table, by the achieved stability makes conditions of immediate motions and an early rehabilitation. Because of that it gives the best functional results.     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

参与式农业基地建设行动方案设计

为了编制实用性强的基地建设行动方案,首先,确定参与式发展的主体,搭建一个"决策框架";其次,针对行动目标,提出不同参与主体,如管理者、农民、消费者等团队与个人的目标及行动内容;最后,工作应向重塑伙伴式合作关系,挖掘农民自我发展潜力,完成三大角色的转换,打造农业基地文化等方向推进.