整体叶盘电解加工工艺研究

针对某发动机整体叶盘,开展了电解加工工艺研究,在整体叶盘电解加工设备上进行了大量的工艺试验,对其加工工艺进行了摸索.通过对试件加工,初步掌握了整体叶盘叶型电解加工的工艺规律,确定了加工工艺参数,为整体叶盘电解加工的工程化应用打下基础.     

基于MasterCAM的T形楔块数控加工工艺分析

对T形楔块加工零件进行了结构分析和加工技术要求分析,详细地分析了常规加工工艺存在的问题,并对常规加工工艺提出了新的加工工艺。实践证明,经改进后的加工工艺,从加工时长、NC文件大小、刀具成本等方面都有了质的飞跃。     

基于PowerMill的打印机外壳定模型芯加工

分析了打印机外壳定模型芯的加工工艺特点,制定了合理的数控加工工艺,对零件的定位与装夹、加工路径和刀具选择等进行了介绍。实践证明,零件的加工工艺设计合理,顺利地完成了零件加工,对类似零件的加工工艺有一定参考价值。     

面向绿色制造的电火花加工工艺综合评价体系和方法研究

为了对电火花加工工艺进行绿色性综合评价,在5个绿色制造目标特性的基础上建立了面向绿色制造电火花加工工艺综合评价指标体系,考虑到电火花加工工艺综合评价指标之间的相互影响关系,提出了一种适用于面向绿色制造的电火花加工工艺综合评价方法 DEMATEL-TOPSIS法,通过建立面向绿色制造的电火花加工工艺综合评价模型,并应用案例对绿色电火花加工工艺方案进行排序得到最优方案,验证了该模型的可行性,为电火花加工工艺综合评价提供了理论依据。     

曲面薄壁铜公的数控加工

运用MasterCAMX软件进行数控加工编程,对曲面薄壁铜公采用合理、有效的数控加工工艺进行加工。结果表明,该工艺保证了数控加工质量,提高了产品的加工效率。     

旋转超声加工工艺试验研究

利用自行研制的旋转超声加工机床,对氧化锆陶瓷材料进行超声加工表面质量分析,对超声加工工艺进行初步试验研究,并利用表面粗糙度仪和超景深显微镜对工件表面粗糙度进行检测和观测。采用正交组合试验法,进行旋转超声加工试验,探讨了超声加工工艺参数对工件表面粗糙度的影响,从而确定一组最优的超声加工工艺参数。     

转杯的加工工艺研究

文章对转杯的加工工艺进行了研究,通过对转杯进行具体的工艺分析,优化了加工工艺过程.在此基础上,编制了转杯的加工工艺路线,选取了合适的切削用量,并针对转杯零件的特殊结构,设计了专用钻孔夹具.通过模拟仿真,证明了其可行性.最终总结和制定出一套完善的转杯加工工艺方案,提高了转杯的加工精度和生产效率.     

木模模样的数控龙门铣床加工工艺研究

结合传统木模成型工艺,采用数控龙门铣床对复杂铸造木模样进行加工,对难加工的圆弧面、扇形孔、超长圆筒体芯盒、斜面、大型底板、角度等分加工等木模模样的加工工艺进行分析研究,得到合理的加工工艺,消除了零件成型缺陷,缩短了开发周期,降低了成本。     

航发压气机叶片的加工仿真分析

航发压气机叶片型面及加工工艺复杂。为降低加工成本、提高加工效率,对某型复杂薄壁航空发动机压气机叶片零件进行加工仿真研究。分析叶片的结构特点,结合加工工艺路线制定原则,制定了叶片加工工艺路线,规划了刀具轨迹;根据五轴机床行程及运动特点,定制了五轴机床专用后处理器,并将刀具轨迹后处理生成了叶片加工的NC程序,同时输出加工总计用时;构建立式五轴数控机床仿真模型,对加工工艺进行仿真验证,取代实际加工试切步骤,节省生产成本和时间。仿真加工结果验证了加工工艺的合理性和后处理的正确性,为加工参数的进一步优化和加工误差分析奠定了基础。     

成型壳体塑件的型芯加工工艺探索

分析了壳体塑件及型芯的结构特点,根据型芯的材料和结构,拟定了合理的加工工艺,并对加工的零件装夹定位、加工策略和刀具参数等进行了介绍。经生产验证,型芯的加工工艺满足生产需要,此工艺对类似零件的加工具有一定的参考作用。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

Effect of Rare Earth Doping on Impedance,Modulus and Conductivity Properties of Multiferroic Composites:0.5(BiLa_xFe_(1-x)O_3)–0.5(PbTiO_3)

The Lanthanum-doped bismuth ferrite–lead titanate compositions of 0.5(Bi LaxFe1-xO3)–0.5(Pb Ti O3)(x = 0.05,0.10,0.15,0.20)(BLxF1-x-PT) were prepared by mixed oxide method.Structural characterization was performed by X-ray diffraction and shows a tetragonal structure at room temperature.The lattice parameter c/a ratio decreases with increasing of La(x = 0.05–0.20) concentration of the composites.The effect of charge carrier/ion hopping mechanism,conductivity,relaxation process and impedance parameters was studied using an impedance analyzer in a wide frequency range(102–106Hz) at different temperatures.The nature of Nyquist plot confirms the presence of bulk effects only,and non-Debye type of relaxation processes occurs in the composites.The electrical modulus exhibits an important role of the hopping mechanism in the electrical transport process of the materials.The ac conductivity and dc conductivity of the materials were studied,and the activation energy found to be 0.81,0.77,0.76 and 0.74 e V for all compositions of x = 0.05–0.20 at different temperatures(200–300 °C).     

Quantitative Analysis of the Crystallographic Orientation Relationship Between the Martensite and Austenite in Quenching–Partitioning–Tempering Steels

The orientation relationships(ORs)between the martensite and the retained austenite in low-and medium-carbon steels after quenching–partitioning–tempering process were studied in this work.The ORs in the studied steels are identified by selected-area electron diffraction(SAED)as either K–S or N–W ORs.Meanwhile,the ORs were also studied based on numerical fitting of electron backscatter diffraction data method suggested by Miyamoto.The simulated K–S and N–W ORs in the low-index directions generally do not well coincide with the experimental pole figure,which may be attributed to both the orientation spread from the ideal variant orientations and high symmetry of the low-index directions.However,the simulated results coincide well with experimental pole figures in the high-index directions{123}_(bcc).A modified method with simplicity based on Miyamoto’s work was proposed.The results indicate that the ORs determined by modified method are similar to those determined by Miyamoto’method,that is,the OR is near K–S OR for the low-carbon Q–P–T steel,and with the increase of carbon content,the OR is closer to N–W OR in medium-carbon Q–P–T steel.     

The Mirror with Patterns of Auspicious Animals and Grapes——Exquisite cast mirror and the technology of surface tin-enrichment by rubbing-in and infiltration of tin-rich powder

<正>Bronze mirrors were used by the Chinese people before the introduction of the glass mirror.Only after it was replaced by the glass mirror did the bronze mirror gradually retreat from people's lives.Different styles of bronze mirrors were made in different historical periods,particularly in the Warring States Period,the Han and Tang Dynasties,which were the three peaks of the development of bronze mirror arts in ancient China.The casting techniques were exquisite.The surface of the bronze mirror was smooth and bright enough to reflect one's image,and there were scarcely any casting defects on the mirror surface.On the back of the bronze mirror,there were rich depictions of Arts and Humanities,and the ornamentations were also     

The 9th China International Diecasting Congress & Exhibition

The 9th China International Diecasting Congress ＆ Exhibition was held on July 22-24, 2014 at Shanghai New International Expc Centre. This exhibition was the most successful over the years, with over 6890 visitors and 155 exhibitors, and the exhibition area increased by 30% from 9,500 square meters in 2012 to 12340 square meters. Die casting enterprises from a total of 24 countries and regions, including China mainland, Chinese Taiwan and Hong Kong, South Korea, Japan, Germany, India, Thailand, Malaysia, the United States, Russia, Australia, Iran, Ukraine, Brazil, Colombia, Singapore, Austria, Canada, Croatia, France, Turkey, United Kingdom, Vietnam, attended the congress and exhibition.     

Introduction of the Fluid Control Engineering Institute of Kunming University of Science and Technology

正The Fluid Control Engineering Institute of Kunming University of Science and Technology was set up in 1996.The researches of institute concentrate on electro-hydraulic(pneumatic)servo/proportional control and hydromechatronics.The Institute is committed to research and development of electro-hydraulic control of high-end technical equipment in ferrous metallurgy refining produc-     

RARE METALS Volume Contents

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Antimony Induced Crystallization of Amorphous Silicon

Antimony induced crystallization of PVD (physics vapor deposition) amorphous silicon can be observed on sapphire substrates. Very large crystalline regions up to several tens of micrometers can be formed. The Si diffraction patterns of the area of crystallization can be observed with TEM (transmission electron microscopy). Only a few and much smaller crystals of the order of 1μm were formed when the antimony layer was deposited by MBE (molecular beam epitaxy) compared with a layer formed by thermal evaporation. The use of high vacuum is essential in order to observe any Sb induced crystallization at all. In addition it is necessary to take measures to limit the evaporation of the antimony.     

A CUMULATIVE FATIGUE DAMAGE RULE UNDER THE ALTERNATIVE OF CORROSION OR CYCLIC LOADING

Fatigue damage increases with the applied loading cycles in a cumulative manner and the material deteriorates with the corrosion time. A cumulative fatigue damage rule under the alternative of corrosion or cyclic loading was proposed. The specimens of aluminum alloy LY12-CZ soaked in corrosive liquid for different times were tested under the constant amplitude cyclic loading to obtain S-N curves. The test was carried out to verify the proposed cumulative fatigue damage rule under the different combinations among corrosion time, loading level, and the cycle numbers. It was shown that the predicted residual fatigue lives showed a good agreement with the experimental results and the proposed rule was simple and can be easily adopted.