辊子长寿化的新技术——Weldclad堆焊技术

堆焊技术一直作为辊子和备件的重要修复手段。英国考维尔Corewire公司的Weldclad堆焊技术是根据辊子工况要求,设计选择相适应的辊子长寿化的堆焊材料,使辊子寿命提高3-5倍。考维尔公司研究开发出上百种适合各种辊子的表面堆焊材料,已成为世界三大冶金设备巨头(奥钢联、达涅利、西马克)辊子设计首选的堆焊材料,其辊子制造规范VAI-TSC-4,Danieli都是他们与考维尔公司共同研究制定的。Weldclad发明的摆动埋弧堆焊技术和自动堆焊设备,可使用户的各种辊子寿命得到显著提高,得到用户的认可,产品销往世界各地。Weldclad堆焊技术在连铸设备上的应用连铸辊是板坯连铸机上最关键的备件,承担着承     

连铸机辊子结构特性

本文论述了连铸机辊子恶化的机理,以及辊子锻造材料和表面堆焊材料的特性,并通过选用锻造件制作辊子、改进辊子表面堆焊材料及提高连铸机扇形段的刚度等方式,来提高连铸机辊子的使用寿命。     

明弧自动堆焊技术在连铸机辊子制造与修复中的应用

奥钢联设计的板坯连铸机，支撑辊子为三分节辊。为提高抗热疲劳性、耐腐蚀性和热硬性，辊子表面需要堆焊不锈钢焊层，难度大，要求高。总结了使用明弧自动堆焊技术对连铸机辊子辊套进行堆焊的实践和经验，具有优异的机械性能和良好的经济效益。     

热连轧卷取机组轧辊的堆焊

一、前言武钢热轧带钢厂是从日本成套引进的。近年来,随着产量的不断增加,辊子备品十分紧张。为了使热轧机组部分辊子的生产和修复立足国内,武钢热轧厂、中国焊条厂、武钢钢研所三个单位组成“热轧辊堆焊组”,选择卷取机组中的助卷辊为代表,进行了堆焊制造复合     

带极堆焊专机的研制和应用

本文着重对辊子旋转和焊机机头变速行走机构速度的设计和计算,经连铸机堆焊辊试制,带极堆焊机达到了能螺旋焊和直焊的功能要求,满足了宝钢1450、1900板坯连铸机堆焊辊产品质量技术要求。     

一米七热轧卷取机夹送辊和助卷辊堆焊工艺

武汉热轧厂地下卷取机的上、下夹送辊和三支助卷辊是一种复合堆焊辊,由日本引进。由于这类辊子质量要求高,价格昂贵,解决这些辊子的供应问题成为热轧厂生产中的关键之一。     

连铸辊的明弧焊和埋弧焊工艺及使用效果比较

主要介绍了宽中厚板坯连铸机扇形段辊子采用的两种堆焊工艺一埋弧焊和明弧焊。阐述两种不同堆焊工艺在同一台连铸机上使用后得出的不同的使用效果。     

冷轧工艺机组水冷辊堵转故障分析及对策

冷轧厂冷轧工艺机组退火炉水冷辊在使用过程中,多次发生堵转故障.导致带钢表面划伤.经过故障分析,确定了导致辊子堵转的主要原因是由于辊子弯曲变形后,固定式的中心导水管在辊子内部与轴头呈多点接触,导致辊子堵转.比较各种对策后,采用了螺旋套管结构的方案,初步解决了堵转故障.讨论了该领域内待解决的问题与发展方向.     

连铸扇形段防腐修复技术的应用

以唐钢热轧1700线扇形段S7-9的防腐修复为例,采用不锈钢水道替代普碳钢水道、等离子堆焊方法在扇形段轴承座上面,以及与其配合的水孔内堆焊防腐蚀材料,提高轴承座与辊子的密封效果,改善了扇形段的使用性能,延长使用寿命。     

关于不同性质堆焊工场设计中的几点异同

通过对冶金企业中修复辊子的生产部门的分类,介绍了在不同性质的堆焊工场工程项目的设计中,按照各自生产特点开展设计工作时的几个注意点。     

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.     

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.     

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)