FANUC系统数控车床加工螺纹浅析

介绍了FANUC系统的数控车床加工螺纹的指令,并在对各指令的车削特性进行分析的基础上,结合实际加工经验,得出数控加工中螺纹编程指令的选用方法及注意要素。     

符合RoHS指令的无铅易切削黄铜合金型材

符合RoHS指令的无铅易切削黄铜合金型材,是一种性能优于铅黄铜且符合RoHS指令的黄铜合金型材。解决了现有铅黄铜合金材料存在的铅对环境和人的生命健康的不利影响,提供一种具有冷热加工性能好、力学性能优良、易切削、成本低且符合RoHS指令的无铅易切削黄铜合金型材,符合市场的需求。     

异形短轴零件的数控车编程与加工方法解析

本文介绍了异形短轴类零件的数控加工程序编制与实施的基本方法和步骤,分析了零件的组成结构、工艺设计、编制了数控加工工艺卡,并通过编制程序进行了仿真加工,得出了复杂短轴零件数控车加工的常用指令和注意事项,给实际加工生产提供了依据。     

基于宏程序的带椭圆曲面复杂轴零件的加工

针对带椭圆曲面轴零件进行工艺分析,制订其加工工序,引入宏程序指令,重点分析椭圆曲面的加工方法和技巧,编写零件程序,完成零件仿真加工。得出对于椭圆曲面的数控加工,采用宏程序进行手工编程,要比自动编程加工快捷、高效、灵活。     

组合件的数控加工工艺分析与加工参数选择

通过一种球阀内部组合件的加工分析,对生产过程中机械加工薄壁、刚性差及强度低的零件做一次深入的研究探讨,并对刀具的选择、参数设定等工艺步骤进行总结归纳.同时,通过对加工过程中复合循环指令的控制的分析与应用,解决此类组合件加工过程中遇到的一些难题.     

某数控机床的伺服电流监测与分析

本文分别针对加工和空运行两种情况,对某数控机床在不同切削参数、不同数控指令以及不同控制参数的情况下,测试了该机床各轴的伺服电流以及运动特性。通过伺服电流的频率分布可以间接的反映切削力对进给轴运动的激励,并监测在切削过程中切削力的变化情况,通过对结果进行分析,可以合理的选择切削参数和加工路径。     

RoHS指令有害物在特钢产品中的状态分析

介绍RoHS(电气、电子设备中限制使用的某些有害物质)指令有害物主要特性和对人体健康的危害,通过选择常用特钢产品加工样本,利用直读光谱仪、X荧光光谱仪等检测设备以及高温加热设备,用理论和实际数据分析了特钢产品在冶炼加工后镉(Cd)、汞(Hg)、六价铬(Cr~(6+))、多溴联苯(PBB)、多溴联苯醚(PBDE)和铅(Pb)的含量在标准规定的有效范围内。     

基于UWB的矿山智能运输系统设计

由于目前现有的矿山智能运输系统在实际应用中经常出现调度指令发送延迟,致使矿山运输效率较低,为此提出基于UWB的矿山智能运输系统设计。系统在硬件方面设计了UWB无载波通信装置和传输装置,利用UWB无载波通信装置实现系统各个单元之间的指令传输,将传输装置代替原有的运输装置,对矿山矿产资源进行运输;在软件方面设计了数据采集模块、运输状态分析模块、运输调度模块以及运输情况实时显示模块四个功能模块,实现系统智能运输功能。经实验证明,基于UWB的矿山智能运输系统调度指令发送延迟时间小于传统系统。     

指令电话电缆检测方法及其应用

指令电话是冶金行业广泛使用的一种工业通信设备。由于电缆连接的特殊性,所以,当系统中某段电缆或某个端局发生短路故障时,就有可能使整个通信系统不能正常使用,为此开发了一套指令电话电缆监控系统来解决此问题。比较了脉冲反射法、伏安法、电桥法三种电缆检测方法,确定采用恒流源电缆检测技术。以宝钢焦炉指令电话电缆监控系统为例,详细分析了恒流源电缆检测电路和应用案例,说明了电缆监控系统的组成与功能。     

钣金工艺中的激光加工技术

激光加工技术在钣金加工中起着重要作用,极大地提高了钣金加工的生产率并促进了钣金加工的发展。在钣金加工中,激光切割机可以大大缩短加工周期,提高加工精度,加快产品开发,降低成本。许多制造公司权衡这些优势。激光切割机越来越多地用于钣金加工。详细讨论了激光技术和激光技术的应用。分析了激光技术在钣金加工中的应用和优势。     

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。     

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.     

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。