可转位车刀刀体及刀片的改进和研究

在锅炉管子制造中,有大量的管端坡口需加工。且形式不一、加工性能不好,效率不高,成本较大,影响制造周期。结合产品工艺和图纸发现坡口角度变化特点,合理选用和使用可转位车刀,改变刀体形状和可转位刀片,大幅降低成本,提高生产效率。     

300MW汽轮机高中压转子齿形锁紧槽成形铣削的研究

对３００ＭＷ汽轮机高中压转子齿形锁紧槽的加工工艺及成形铣刀的设计作了介绍，并对耐热合金的切削性能及切削耐热合金钢用复杂刀具的材料作了简要说明。     

侧装型轮槽铣刀的检测

为了适应我国电力事业突飞猛进的发展,提高汽轮机心脏部位——转子的加工精度,我厂引进了先进的英格索尔铣床,专门用于加工纵树型叶轮槽。同时也从西屋公司引进了与之相配的专用铣刀(侧装型轮槽铣刀)。近年来,我们共对7批近2500把进口轮槽铣刀进行了检测验收,发现其中有350把铣刀存在质量问题,即向厂部汇报。向外商交涉,索赔成功。已为我厂节约14万美元。最近我们还与有关部门协作,对国产轮槽铣刀进行检测,使国产铣刀逐步替代进口铣刀。经试铣,使用情况良好,这样又可使成本降低为原来的50%。侧装型轮槽铣刀可分为:锥铣刀、半精铣刀、精铣刀。其中精铣刀外形,如图1所示。下面分别介绍轮槽铣刀的检测方法。     

1000MW汽轮机低压转子轮槽成形铣刀加工性能研究

采用成形铣刀加工1000MW汽轮机低压转子末级轮槽,通过对26NiCrMoV145转子钢材料切屑的形成情况、刀具磨损形貌以及加工后材料表面残余应力大小的分析,研究成型铣刀的加工性能。结果表明:材料的切屑以带状切屑为主;粗刀以刀刃处边界磨损居多,而半精刀以前刀面损伤更为突出;加工表面残余应力多为残余压应力。     

高效精密的镗孔技术

为了缩短精镗加工时间,减少热变形带来的质量问题,使孔的表面粗糙度稳定在R_a1.6～0.8um范围内,上海沪东造船厂技术人员分析研究,采用宽刀刃高速镗削,使宽刃镗刀片大幅度提高进给量,有效的提高孔表面的质量,在整个精镗过程中减少了刀片实际切削工件的次数,有利于减缓刀刃的磨损。以目前采用的刚性镗刀盘为例,在该盘的180°方向上装有两副径向尺寸可调的刀座和宽刃可转位的精镗刀片。两刀座在轴向相距6mm时,径向     

双T形转子轮槽加工用成形车刀的研制

论述了双T形转子轮槽加工中所用成形车刀的设计方法及制造时关键要点。     

汽轮机转子枞树型轮槽铣刀的制造研究

文了深入探讨．章在对枞树型轮槽精铣刀进行分析的基础上，结合实际生产经验，对其制造工艺流程、加工难点等问题进行并进一步对轮槽铣刀的关键加工技术进行了分析研究，制定出了合理有效的加工制造策略．为轮槽铣刀的加工制造提供了全面系统的技术参考．     

φ320铣刀铝件硬质合金可转位端面铣刀

用于生产一年多的可转位端面铣刀，加工S195柴油机齿轮室盖的W面，切削轻快，机床震动小，加工后表面粗糙度可达R32，平面度小于0.08mm,文中介绍了刀具的结构，参数，材料和切削用量等。     

羰基镍合成釜研制

通过羰基镍合成釜的研制,阐述了小内径复合板筒体成形方法,上、下平盖堆焊及加工、液压拉伸器应用过程。     

模块式超精铣刀及以铣代磨工艺的研究

分析了德国英格索尔公司典型的６Ｆ２Ｋ型超精铣刀的结构特点，对切削过程中的切削力、直刃刀片及带圆弧刃刀片的使用进行了分析，研制出结构合理、精度高、调整方便、模块结构的超精铣刀。选用了带大圆弧刃的ＹＣＥ４３４－０１型刀片，试验出合理的几休角度，找出了影响表面粗糙度及平面度的塑性变形有、弹性变形、热变等因素，研究出了一条加工大平面以铣代磨的工艺。     

Unerroric of control of mutual compliance of the efficiency of hydrogen engines of unmanned vehicles in the conditions of mass production

The issues related to the reliability of hydrogen engines of unmanned vehicles and increasing the efficiency of using hydrogen as fuel when using the method of its production during the decomposition of hydrogen-containing molecules of liquid-phase organic compounds in a plasma discharge under the action of intense ultrasonic exposure are considered. Experiments have shown that as a result of decomposition in the acoustoplasma discharge of liquid hydrocarbons, solid-phase carbon-containing products are formed, chemical transformations occur in the liquid phase and hydrogen-containing combustible gas is formed. Hydrogen-containing gas can be used as fuel immediately after synthesis, i.e. it does not require separation, since in addition to hydrogen it contains only impurities of CO₂ and water vapor. The purpose of the study is to formalize the basic conditions for tightening the control of mutual compliance with the efficiency of hydrogen engines of the same series in the conditions of their mass production. Methods of mathematical statistics and hardware-software modeling were used in the study. The term “unerroric of quality mutual compliance control” is introduced to describe a set of hardware and software tools for such control. The principle of in-depth testing of the technical condition of such engines of one series is described in a multidimensional formulation of the quality control problem for three of their operating parameters at once. The conditions for increasing the mutual correspondence of the measured values of such parameters in the conditions of serial production of hydrogen engines are formalized.     

MgO膨胀剂细度对MgO水化和水泥浆体膨胀的影响

基于《水工混凝土掺用氧化镁技术规范》中的Ⅰ型氧化镁（MgO）,研究了该型MgO膨胀剂（MEA）细度对掺粉煤灰水泥浆体膨胀性能的影响。即采用X射线衍射分析(XRD)及同步热分析（TG DSC）分析了掺MEA水泥浆体中MgO的水化性。结果表明,养护温度相同时,MEA的细度对水泥浆体内MEA中MgO的水化和水泥浆体的膨胀无显著影响,产生的膨胀均能补偿水泥浆体的收缩;MEA的细度可从试验设计采用的45 μm筛筛余15%左右增加到30%左右,这将有利于MEA生产企业的节能降耗。     

小型锅炉烟尘测试时锅炉出力的计算

锅炉烟尘测试时，必须对锅炉出力进行测试。但监测中，许多小型锅炉往往不具备相关的计量装置和仪表，为解决这一问题，文章提出了用烟气量和空气过剩系数来计算锅炉的出力的公式，在实际使用中，该方法简单易行，其结果和实测值具有很好的一致怀。     

生物质催化热裂解技术的研究进展

生物质催化裂解是生物质热化学转化的一种重要途径。综述了生物质催化热裂解技术使用的反应器、催化剂类型,以及催化热裂解过程中热裂解温度、吹扫气、升温速率、生物质原料等条件的影响,展望了生物质催化热裂解技术的发展趋势。     

燃烧流化床气泡能量分布模型

应用瞬态谱分析方法对燃烧流化床声波信号进行了频谱分析,发现气泡能量分布呈Ｇａｍｍａ分布形式,在Ａｒｇｙｒｉｏｕｓ和Ｙｏｓｈｉｄａ等人提出的模型的基础上,发展了燃烧流化床气泡能量分布模型,并通过优化迭代对模型参数进行求解,在实验和理论的基础上得出了更加切合实际的燃烧流化床气泡能量分布模型     

促进城镇生活污水处理装置产业化

城镇生活污水处理装置是由农村户用沼气地发展演变而来，是一种小型、分散化处理污水的装置 ，是环境建设的需要。文章着重从我国环保政策及目标、生活污水造成的污染状况、急需整治的公共设施、生活污水净化装置的演变以及社会经济效益和环境效益等方面，阐述了其产业化的重要性。     

Investigation of effect of variation of cycle parameters on thermodynamic performance of gas-steam combined cycle

The paper deals with second law thermodynamic analysis of a basic gas turbine based gas-steam combined cycle. The article investigates the effect of variation of cycle parameters on rational efficiency and component-wise non-dimensionalised exergy destruction of the plant. Component-wise inefficiencies of the combined cycle have been quantified with the objective to pin-point the major sources of exergy destruction. The parameter that affects cycle performance most is the TIT (turbine inlet temperature). TIT should be kept on the higher side, because at lower values, the exergy destruction is higher. The summation of total exergy destruction of all components in percentage terms is lower (44.88%) at TIT of 1800 K & r_p,c = 23, as compared to that at TIT = 1700 K. The sum total of rational efficiency of gas turbine and steam turbine is found to be higher (54.91%) at TIT = 1800 K & r_p,c = 23, as compared to that at TIT = 1700 K. Compressor pressure ratio also affects the exergy performance. The sum total of exergy destruction of all components of the combined cycle plant is lower (44.17%) at higher value of compressor pressure ratio (23)& TIT = 1700 K, as compared to that at compressor pressure ratio (16). Also exergy destruction is minimized with the adoption of multi-pressure-reheat steam generator configuration.     

汽油特性参数间的关系分析

汽油的特性参数对汽油机的燃烧和排放具有重要影响。通过对市售汽油特性参数间关系的统计分析，得到了汽油密度同汽油的平均氢碳原子数之比和汽油空气混合气的理论空燃比之间的线性关系式。这些统计关系式可用于由测量的汽油密度值推测汽油平均氢碳原子数之比和汽油空气混合气的理论空燃比等，还可用于改善汽油机热计算精度和汽油机空燃比的测量、控制精度。     

铁路干线机车车门的发展综述

车门是机车车体的重要部件,是司乘、维修人员的通道口,它具有分隔空间、密封防雨、隔音消音、保温隔热等功能,紧急情况下作为逃生救护通道。通过回顾大连机车车辆有限公司使用过的铁路干线机车车门,浅析其结构特点,并对比介绍了近年来新开发的两种铝合金结构车门。     

Variation of activation energy of hydrogen absorption of vanadium as a function of aluminum

Hydrogen absorption kinetics of vanadium–aluminum alloys in the temperature range of 624–924 K have been studied. These alloys were prepared by the aluminothermy process and refined by electron beam melting. The data of instantaneous reacted fractions at four different temperatures were obtained using the pressure drop method and these data were linearly fitted to a suitable reaction mechanism function. Three-dimensional diffusion appears to be the intrinsic rate limiting step of the hydrogen absorption. The rate constants were obtained from the slope of the linearly fitted curves. Apparent activation energies were calculated using the Arrhenius equation. The activation energies were increased linearly with aluminum content resulting in a decrease in the hydrogen absorption rate. The variation in standard entropies and enthalpies of vanadium–hydrogen solid solution has been studied as a function of aluminum content.