武钢CSP带钢断面局部缺陷产生原因与改进

以武钢条材总厂CSP分厂冷轧用热轧带钢的局部高点缺陷为研究对象,分析了局部高点产生的原因,并提出了采用轧制工艺控制手段的改进措施。改进后,工作辊窜辊范围更广,窜动位置分布曲线更合理,轧辊的磨损量和不均匀磨损明显减小,磨损曲线也趋于平滑;避免了带钢局部过冷现象,消除了带钢断面＂猫耳朵＂,提高了板形控制效果,延缓了局部高点缺陷的产生。     

热轧带钢局部高点产生机理及控制研究

冷轧带钢生产过程中出现的"起筋"缺陷问题与热轧带钢局部高点产生有密切关系,加强热轧工序板形控制,可减少局部高点对冷轧带钢生产的影响。本文通过对热轧带钢局部高点产生机理分析,提出优化策略,为热轧带钢局部高点控制研究提供依据。     

冷轧用钢隆起缺陷原因分析与控制

针对河钢唐钢1 810线供冷轧用钢(DD11)深加工时容易产生隆起缺陷的问题,通过现场统计,研究隆起的位置、特征,系统分析了热轧、冷轧工艺过程对隆起缺陷的影响。研究认为,冷轧卷产生隆起缺陷主要与原料卷的局部高点有关。从河钢唐钢1 810线实际装备条件出发,通过合理优化编排轧制计划、严格控制轧辊使用吨位及公里数、设置合理的轧辊原始凸度、严格执行轧制带钢冷却制度,避免了热轧带钢形成过大的局部高点,从而使供冷轧用钢隆起缺陷大幅降低,产品质量满足冷轧需求。     

面向局部高点控制的工作辊同宽轧制公里数

 为适应市场和节能降耗的迫切需要,提出了工作辊同宽轧制公里数研究,基于金属塑性变形和辊系弹性变形等模型耦合建立起描述带钢断面形状的仿真系统,以带钢断面形状良好即局部高点为控制对象,研究了在不同轧制模式下,工作辊同宽轧制公里数与带钢局部高点的关系。模拟计算和生产试验表明,普通模式下工作辊轧制公里数明显受限于同宽带钢轧制,相比普通轧制,采用合理的窜辊轧制可以大大提高带钢同宽轧制公里数,有效控制带钢局部高点,研究结果对组织轧制生产和制定换辊制度具有重要的指导意义和实用价值。     

局部高点对冷轧开卷带钢附加浪形的影响

针对由带钢局部高点引起的冷轧钢卷开卷后产生的附加局部浪形问题,建立起描述带钢的失稳波形模型,并基于薄板能量理论和局部高点层间压力模型推导出带钢附加浪形失稳临界值的计算公式,运用数值模拟方法定量分析了局部高点单因素对开卷带钢附加局部浪形的影响,数学模型的可靠性得到了模拟计算和生产试验验证,从而为生产现场治理带钢附加局部浪形缺陷提供了重要的指导依据。研究结果表明,随着带钢局部高点值的增大,带钢失稳临界压应力值就越小,开卷带钢附加局部浪形就越容易发生。     

热轧辊型技术对冷轧钢卷局部突起缺陷的抑制

为解决由热轧带钢不良断面形状遗传到冷轧带钢而引起的钢卷局部突起缺陷,在分析猫耳形磨损辊型对热轧带钢断面形状不良影响的基础上,提出了以抑制热轧带钢边部增厚和局部高点相对高度为目的的工作辊余弦辊型.模拟计算和实验表明,余弦辊型明显改善了带钢断面形状、降低了边部增厚和局部高点的相对高度,解决了冷轧钢卷局部突起缺陷问题,并为现场解决类似问题提供了新思路.     

带钢"起筋"成因分析与对策

对热轧带钢在冷轧过程中产生的"起筋"缺陷进行了分析.通过大量统计数据,分析了"起筋"位置、成因、"起筋"卷局部高点、凸度以及楔形之间的关系,并对热轧工艺进行了改进,取得了很好的效果,保证了断面适当的大凸度、小楔形和适当的局部高点,大大降低了带钢"起筋"率,改善了产品质量.     

热轧带钢局部高点对冷轧带钢板形的影响

热轧带钢局部高点对冷轧带钢板厚和内应力分布具有重要影响。采用B3样条函数拟合带材厚度横向分布，定量研究热轧来料局部高点对冷轧带钢板厚和内应力分布的影响。研究结果表明：轧后带钢局部高点高度及附加张应力的大小与来料高点高度成正比，随总轧制压下率的增大而减小。     

SPHC热轧带钢边部“黑线”研究

为了消除酸洗后显现在SPHC热轧带钢边部处的黑线缺陷,利用金相显微镜、扫描电镜、能谱仪等相关试验手段,研究分析了带钢边部黑线产生的原因.结果表明:带钢边部黑线缺陷处成分主要为Fe元素,组织为铁素体和少量珠光体,存在粗晶、混晶现象.黑线产生的主要原因是带钢边部存在裂纹,轧制过程中由于拉应力使边角部金属翻平到带钢表面形成黑线.通过改善带钢边角部质量和优化立辊辊型及轧制工艺,可有效消除黑线缺陷,保证良好产品质量,提高成材率,从而满足市场的需求.     

热轧带钢局部高点的原因分析及改进措施

对热轧带钢在冷轧时产生局部高点的原因进行了分析,并提出了相应的改进措施.改进后,精轧机的轧辊磨损量减少了约120～150μm,不均匀磨损减少了40～60μm,从而解决了冷轧料局部高点问题.     

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。     

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.     

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)     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.