小型棒材轧机飞剪剪刃结构改进与优化

为延长剪刃寿命,莱钢棒材厂对飞剪剪刃结构进行了改进与优化。刀片材质选用H13,并提高淬火、回火温度,增加回火次数;通过改变剪刃位置来改变剪切点,优化剪刃结构。改进后,剪刃使用寿命提高了2～3倍,减少了更换时间,降低了生产成本。     

双切剪下剪刃轴向窜动原因分析及解决措施

针对酸洗机组双切剪下剪刃在运行过程中频繁窜出的问题,计算验证了剪刃锁紧力是否符合要求,分析了剪刃锁紧在实际应用中遇到的具体问题,指出了剪刃锁紧拉杆内的碟簧组失效是导致下剪刃锁不住的原因,通过设计制作专用的剪刃轴向固定装置,解决了双切剪下剪刃窜出问题。     

850t冷剪常见故障及解决措施

对昆玉棒材850 t冷剪发生的几种典型故障进行了剖析。通过优化离合器、制动器摩擦片的间隙、离合器的运行参数和备件更换标准，解决了冷剪离合器、制动器抱死问题；通过对冷剪剪切时离合器的工作流程进行剖析，优化剪切时间周期，通过改善刀座锁紧缸检修维护方法等，解决了冷剪不剪、剪不断钢筋的问题；通过优化上、下剪刃的间隙，对铜衬板进行修复，减少铜衬板与滑枕的间隙，对刀座采取加固措施，解决了冷剪钢筋弯头、毛刺、剪切压痕问题。     

本钢冷轧厂MICROMATIK飞剪电气控制系统

阐述了本钢引进的MICROMATIK飞剪电气控制系统的组成和工作原理，重点叙述了同步定尺剪切，剪刃更换及剪刃间隙调整等功能。     

飞剪机剪刃磨损数值模拟分析

利用Deform-3D建立了剪刃剪切带钢的模型,分析了剪切速度、带钢厚度、剪切温度、剪刃间隙、剪刃重合度和剪刃截面角度等因素对剪刃磨损的影响,得出剪刃的磨损云图和刀尖最大磨损点随时间变化的磨损曲线,以及剪切参数对剪刃磨损的影响规律。为优化剪切工艺参数,提高剪刃寿命以及延长剪刃更换周期提供了理论参考。     

圆盘剪对板形的影响及解决方法

圆盘剪在剪切薄规格的钢板时，出现了抽边及横向不平度在距尾部一定范围内突变，钢板前后宽度不一致。通过在上剪刃上增加一志剪刃直径相近的胶套，在剪机的轴心位置上增设一小胶辊，将辊缝调为零，且钢板在进入剪机前，将对中小立辊适当松开，禁止将钢板顶成凸形。从而肖效解决抽边及横向不平度的突变，夹持力适当可避免前宽后窄。     

攀钢1450热轧板厂滚筒式切头飞剪剪刃改进分析

通过对热轧板厂主轧线切头飞剪剪刃原设计不合理参数的分析计算 ,结合实际对剪刃倾角进行改进 ,对剪刃重叠量、间隙值进行优化 ,解决了剪刃磨损快、寿命低这一制约生产的难题。对消化吸收引进设备、引进技术具有借鉴意义。     

攀钢1450热轧厂滚筒式切头飞剪剪刃改进分析

通过对热轧板厂主轧线切头飞剪剪刃原设计不合理参数的分析计算,结合实际对剪刃倾角进行改进,对剪刃重叠量、间隙值进行优化,解决了剪刃磨损快、寿命低这一制约生产的难题。对消化吸收引进设备、引进技术具有借鉴意义。     

热轧带肋钢筋剪切弯曲缺陷产生原因及改进措施

分析了棒材生产线热轧带肋钢筋冷剪剪切弯曲缺陷产生的主要原因。通过压辊改造及更换压辊气缸、调节剪刃剪切间隙、输出辊道的平衡调整、排钢链的检修调整等改进措施,消除了成品钢筋剪切弯曲的产生,生产指标明显提升。     

超深冲钢切边质量的影响因素及改进措施

针对邯钢公司超深冲钢切边后出现大量的毛边、边裂等问题,分析了切边剪的构造及工作原理。结合生产工艺操作,对引起切边后钢边毛边、边裂缺陷的热轧原料质量缺陷、剪刀间隙计算有偏差、剪刃标定不准确、剪刃间隙出现跳动及液压螺母和压环使用欠规范等因素逐一制定了改进措施。实施后,超深冲钢产品的切边缺陷率降低了90%,因边部缺陷更换剪刃造成的停车明显减少。     

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)