视窗环境下水轮机修复机器人操控系统的开发

针对水轮机修复机器人涉及到大量实时计算和方便灵活的操作界面等方面的问题,采用一种基于专用DSP芯片的运动控制器PMAC卡嵌入通用IPC机构成一种典型的前后台结构的操控系统,使得开发出的操控系统具有友好的人机界面和良好的实时性.实践证明,该操控系统具有轨迹行程精确、响应速度快、控制精度高等优良性能.     

Magnetic properties of grain oriented ultra-thin silicon steel sheets processed by conventional rolling and cross shear rolling

A new procedure consisting of the cross shear rolling (CSR) and the subsequent tertiary recrystallization annealing under dry hydrogen atmosphere was developed to produce the grain oriented ultra-thin silicon sheets less than 0.1 mm with high magnetic property performance. For comparison, the conventional rolling (CR) was also used to process the grain oriented ultra-thin silicon steel sheets. The effect of processing parameters on magnetic properties of the grain oriented ultra-thin silicon steel sheets was investigated. With the increase of annealing temperature and holding time, magnetic properties of the sheets processed by both rolling methods reach saturation as the result of the proceeding of the tertiary recrystallization. The thin sheets rolled by CSR did achieve better magnetic properties than those rolled by CR.     

Analysis of superalloy turbine blade tip cracking during service

High Pressure Turbine (HPT) first stage blade is the most important rotational components of aero-engine. It operates at high temperature and under conditions of extreme environmental attack such as oxidation and corrosion, is especially subjected to degradation by oxidation, corrosion and wear. During the service of aero-engine, the HPT first stage blades made of c 6 y nickel-based superalloy suffer from increasing blade tip cracks after hundreds of hours service. This significantly affects the whole engine function and, of course, safety of the aircraft. In this paper, the premature tip cracking of the HPT first stage blade is investigated. The research result shows that turbine blade tip is initially damaged by rubbing and corrosion over a period time, premature cracking of blade tip is caused by a combination mechanism of environment and thermal stress. During turbine blade maintenance and refurbishment, coating of both oxidation-resistance and abrasion-resistance should be applied in blade squealer tip to counteract the problem.     

汽轮机叶片叉型叶根的超声波横波检测

介绍了100MW汽轮机组叶片又型叶根的超声波横波检测工艺及实践运用，肯定了横波检测叶根裂纹的准确性和可靠性，对运行时间长，易产生裂纹的叶根部位，实施横波检测，实践证明是一种较为理想的检验方法。     

数控超声磨削陶瓷型面自动编程系统研制

介绍了新研制的数控超声磨削成形加工机床的各运动轴，以及实现平行直纹面数控超声磨削加工的刀位计算和后置处理方法．分析了Visual C＋＋调用Matlab引擎时数据传递过程，实现了自动编程系统软件设计，并试验加工了陶瓷叶片直纹面．该自动编程系统使该机床可充分发挥其功能，所采用的Visual C＋＋与Matlab混合编程方法大大降低了软件开发难度，该方法也可为其它数控加工自动编程系统和非实时系统的开发提供参考．     

Digital Manufacture Techniques for Large Hydro Turbine's Blades

Blades are one of the vital components and most difficulty in manufacturing of large hydro turbines.In order to cost-effectively and productively manufacture these kinds of blades,a series of digital techniques in manufacturing have been devel- oped,which includes digital design of hydro turbine blades based on manufacture' requirements,Computer-aided location and the machined error evaluation by using 3-dimensional digitized measuring,tool path generation strategy to meet requirements of en- hancing machining efficiency and controlling deviation in NC machining,tool path generation and NC machining simulation by es- tablishing a virtual NC machining environment for blades,and reasonable and feasible strategy and the systematic scheme for man- ufacturing of large blades by using 5-axis simultaneous CNC machining.The developed digital manufacture techniques have been successfully applied in manufacturing of both the large Kaplan and Francis hydraulic turbine blades;it shows that higher efficiency and the better surfaces finish accuracy can be achieved.     

混流泵叶片角对泵性能的影响

根据对已有试验成果的分析,提出了混流泵叶片角对效率、轴功率系数、叶轮出口液流角、阻力系数和摩擦系数等有关性能参数影响的表达式,为进一步研究混流泵性能提供了理论基础。     

低压缸末级叶片补焊后断裂失效分析

通过对秦皇岛发电有限责任公司1号机组低压缸末级叶片断裂事故分析，发现原叶片局部受损伤后曾进行补焊处理，补焊工艺的不完善而造成的焊接质量不佳，导致补焊区出现晶粒粗化，使综合机械性能下降，而造成了叶片断裂事故的发生。     

320 MW机组的振动分析与解决

天津大港发电厂2号机组2004年12月锅炉改造投产以来一直存在轴瓦振动超标的问题.利用在机组甩负荷试验期间,对2、3、4号瓦振动超标进行了现场动平衡处理.从最终的效果看,造成3、4号瓦振动异常的原因并不是转子的残余不平衡引起的,主要原因是由于低压转子轴承座系悬臂支撑方式,相对来说动刚度较低,同时末级叶片司太立合金严重冲蚀,导致蒸汽激振力增加,致使机组在30 MW负荷以下或空负荷时瓦振正常,在30 MW以上机组振动随负荷升高而增大.     

安徽省2004年度汽轮机叶片重大事故的原因分析及处理

对安徽省2004年度汽轮机叶片发生几次事故的原因分析，表明与叶片共振，加工、组装、银焊工艺等因素有关。