M6发生器支架冲压工艺与级进模设计

介绍了M6发生器支架的结构与成形工艺,为保证零件弯曲成形尺寸精度,采取了既能简化模具结构又能减小零件弯曲回弹的措施,设计了合理的冲压工艺与模具结构,模具在调试合格后能生产出满足设计要求的零件。     

支架成形工艺分析及多工位级进模设计

分析了支架的冲压工艺性及冲压工艺方案,根据制件结构特点及特殊部位成形工艺要求,提出了9工位级进模的冲压工艺方案。重点阐述了排样设计、模具结构及设计技巧。生产结果表明,工艺方案合理,模具结构安全可靠。它保证了产品的形状和尺寸精度,对类似零件的成形工艺及模具结构设计有参考价值。     

支架成形工艺及模具设计

通过对支架零件的冲压成形工艺分析,介绍了空间曲面类零件冲压成形的特点,设计了合理的模具结构,采用一模两件的方式来抵消成形时的侧向力,从而很好地实现产品成形。同时,介绍了该产品压形、剖切、切边冲孔及翻孔等工序模具的结构设计要点。实践证明,上述冲压工艺及模具设计能保证该支架的形状及尺寸精度,且模具制作简单,安装、维护方便,有效地提高了生产效率,降低了生产成本。     

定位支架级进模设计

对定位支架的成形工艺进行分析,制定了合理的冲压工艺,设计了生产定位支架的精密级进模,介绍了模具结构特点和零件端部圆弧与Z形弯曲结构,合理布置浮顶镶件控制成形。实践证明:模具结构合理、可靠,生产的零件合格,对类似零件的成形有一定的参考价值。     

支架复合弯曲模的设计

针对支架零件的结构特点与生产批量要求,对该支架零件进行了冲压成形工艺分析与计算,确定了合理的工艺方案,设计了一次弯曲成形复合模,介绍了模具结构特点及工作过程。经生产实践,该模具结构合理,支架零件质量好。     

复杂支架零件成形模设计

对复杂支架零件进行工艺分析,制定合理的冲压工艺,并根据零件的加工要求,设计成形弯曲模,解决了模具结构设计时遇到的问题,模具结构可靠,生产的零件符合要求。     

左后内轮罩安装支架级进模设计

分析了左后内轮罩安装支架的成形特点,采用级进模冲压生产,介绍了零件排样、模具结构及模具工作零件等的设计,模具采用挡料销粗定位、导正销精定位,保证了送料精度。凸、凹模镶件采用直通式结构,便于制造和维修。模具生产的零件质量稳定,结构紧凑合理、操作方便,能满足零件精度和大批量生产的要求。     

支架冲压工艺与模具设计

根据支架结构特点及技术要求,围绕如何提高生产效率、降低制造成本、简化模具结构,制订了复合模冲压成形的工艺方案.在冲裁复合模设计方面,解决了条料的定位、导向、卸料、出件、优化模具结构等技术问题.在弯曲、翻边、胀形复合模设计方面,借助"一面两孔"定位,解决了支架在成形过程中的偏移问题;通过控制成形模具的间隙,控制了弯曲回弹.实践证明,上述冲压工艺及模具设计生产效率高,模具结构合理,能保证支架的形状及尺寸精度.     

支架簧多工位级进模设计

分析了支架簧的冲压工艺,设计了零件的排样方案,介绍了模具冲裁凸、凹模镶件及压弯成形镶件的固定方式及条料的脱模、送进和定位方式及主要模具材料的选用。着重介绍了类似U形弯的成形方式及主要模具零部件的设计过程。可为其他类似形状零件的模具设计提供借鉴。     

电器支架成形工艺及模具设计

通过对电器支架零件的冲压工艺分析，制定出了一种合理的冲压工艺方案．着重介绍了弯曲成形模及挤合成形模具结构，并对模具的设计要点进行了介绍。     

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.