梯度结构硬质合金涂层刀片切削性能研究

研究了梯度结构硬质合金涂层刀片和无梯度结构硬质合金涂层刀片的切削性能．并对不同钴含量梯度结构硬质合金刀片的切削性能进行了对比实验。实验表明：具有梯度结构硬质合金涂层刀片的切削性能比无梯度结构硬质合金涂层刀片的切削性能优良；达到同一磨损高度hB=0．15mm时，前者的切削寿命较后者提高了近一倍；同时随着合金钴含量增多，硬质合金刀片的切削性能提高。     

提高切片机刀片寿命的探讨

实验指出,内圆切片机切片时,采用负向切片,对提高硅片均匀性及便于机械手取片是可取的,但会增加修刀次数,降低刀片寿命。掌握刀片刃口和基面的修磨技术是提高刀片寿命的关键。     

可转位刀片合理价格的计算

金属加工工业的发展要求采用高效率加工方法,提高工具寿命及切削速度,因此,当前改进硬质合金金属切削工具的主要方向之一是高效率的可转位刀片的推广应用。可转位刀片的应用可以省去刀片焊接及刀刃重磨等工序,消除工具制造过程中出现的裂纹及显微裂纹,从而大大地提高了切削工具的使用性能。缩短了工具的调整时间,降低了生产费用。装配国产可转位刀片的刀具在苏联的维     

改进用于精炼高镍钢的VOD钢包渣线的材质

高Ni钢种有厌Cr及C的特性。作为其精炼炉所使用的耐火材料，应满足在有Cr及游离C条件下提高寿命、降低成本的要求。为此，进行了以下的开发及工业试验。     

非金属夹杂物对钙系与钙硫系易切削钢切削性能的影响

研究了在18t钢包中采用喷粉方法生产的钙系与钙硫系易切削钢中非金属夹杂物对切削性能的影响。试验结果表明：以200m/min的速度切削Y40CrCa钢时，刀具寿命比切削40Cr钢时高6－10倍；以160m/min的速度切削Y40CrCaS钢时，刀具寿命比切削40Cr钢时高20倍。经能谱仪查明在刀具后面形成保护薄膜，它是延长刀具寿命的主要原因。     

双刀片切削技术在轧辊加工中的应用研究

传统的单刀片刀具加工,受限于刀具强度、寿命等因素,机床功率只能发挥20%～50%,机床功率不能得到充分利用。通过双刀片刀具的应用,可达到双刀架的效果,提高了设备利用率,提高了加工效率。双刀片刀具通过双刀片同时切削,同等情况下,明显的提高了切削深度,有效提高了机床功率利用率,加工效率提高70%～90%。在机床功率允许的情况下,还可以应用于双刀架机床,实现四个刀片同时切削,可进一步提升双刀架机床的加工效率。对于加工余量较大的粗加工,双刀片刀具效果更明显。     

机夹刀片

株洲硬质合金厂在生产斗争和科学实验中不断地总结经验,74年以来开始大批生产机夹刀片,75年产量已突破50吨大关,43个品种,24个规格。76年要在75年基础上实现翻番,突破100吨大关。与焊接刀片相比,机夹刀片有如下一些优点: 1.刀具不需焊接刃磨,完全避免了产生内应力和裂纹的可能性,因而刀具的寿命平均提高1～1.5倍。     

稀土元素对Cr20Ni80寿命的影响

本文研完了稀土元素加入Cr20Ni80电热合金时对其快速寿命的影响。研究表明,稀土元素的加入显著地提高Cr20Ni80合金的快速寿命,当残存稀土量为0.013％时,其快速寿命由不加稀土时的67h提高到91h,提高了35％。批量生产Cr20Ni80电热合金的稀土含量波动在0.030～0.066％,此时抽检的1175℃快速寿命为168.5～190h,大大高于GB1234—85规定的≮100h的标准。     

4Cr2WMoVSi热作模具钢的研究与应用

以多元少量的合金化原则设计的4Cr2WMoVSi钢是一种经济型热作模具钢,研究了4Cr2WMoVSi钢的热处理工艺及性能,并与3Cr2W8V钢的热处理工艺和性能作了对比,用4Cr2WMoVSi钢制作了热剪刃,进行了装机使用试验,其使用寿命与3Cr2WSV剪刃的寿命相当,而是5CrW2Si剪刃寿命的3．4倍。     

铣削高锰钢用高性能硬质合金铣刀材料的研制

通过对硬质合金的材料成分、碳化物晶粒度、复杂碳化物相间的交互作用分析,并辅以合适匹配的刀具参数进行分析和研究,优选出固溶体、黏结相和晶粒度合理配比,研制出了新型硬质合金D16刀片材料。结果表明以该材料制成的硬质合金铣刀性能良好,完全可以替代德国维迪亚TN35M铣刀,经试验,其寿命超过进口铣刀一倍,超过国内同类刀片材料(自贡767,YC30S)寿命4~6倍,是一种比较理想的铣削高锰钢用高性能硬质合金铣刀材料。     

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)