汽车油桶盖弹簧式斜顶脱模机构及注射模设计

针对汽车油桶盖内部有内螺纹及圆盖形状的结构特点,注射成型时需进行内螺纹脱模抽芯,设计了多腔三板式点浇口模具结构。内螺纹的脱模采用管式弹簧斜顶杆推出机构,并设计相应的顶出斜顶杆脱模机构,实现塑件自动脱模和自动化生产需求。内螺纹脱模机构设计合理,工作稳定,可为成型同类塑件的模具设计提供参考。     

旋盖双层推出自动脱螺纹注射模设计

根据旋盖塑件的结构特点,设计了自动脱螺纹的模具结构,并分析和研究了模具的浇注系统、内螺纹脱模机构、双层推出结构和冷却系统,通过采用螺杆传动结构,完成了塑件的内螺纹自动脱模。经生产实践证明,模具结构合理,注射过程中各模具零件动作平稳可靠。     

接线盒注塑模设计

分析了完整内螺纹塑件的结构特点,介绍了其注塑模的结构和工作过程,着重阐述了内螺纹塑件注塑模的自动脱模机构设计。该模具结构巧妙,避免了使用螺纹型芯镶件进行模外脱模,成功地解决了完整内螺纹塑件的脱模问题,其工作过程稳定、可靠,能实现自动化操作,在实际中使用效果良好。     

内螺纹前端盖注射模设计

针对塑件上螺纹及芯部需同时抽芯脱模的要求,设计了一副内螺纹脱模抽芯复合机构注射模。采用液压马达驱动方式脱螺纹,内螺纹抽芯复合机构基本组成包括液压马达驱动组件、传动齿轮、螺纹型芯、传动齿条,通过塑件外部止转结构是使该机构可以实现塑件内螺纹抽芯脱模功能。模具结构设计合理,实现了塑件注射成型的自动化生产。     

手机面盖注射模设计

介绍了某手机面盖注射模结构与工作过程,模具采用热流道浇注系统,设有3个侧向滑块抽芯机构,一个侧向内螺纹自动脱模机构以及5根动、定模斜推杆抽芯。各脱模机构工作稳定可靠,生产的塑件质量符合设计要求。     

改性ABS观察孔盖多板模设计

某机床机油观察孔盖塑件需要使用高刚性阻燃工程塑料丙烯腈-丁二烯-苯乙烯塑料针对其注塑成型中模腔浇注和脱模设计都比较困难的生产实际难题，设计了1副一模四腔多板注塑模具用于该塑件的成型。模具中，单腔模腔使用点浇口流道供料给2个内壁潜伏式浇口供料，对模腔进行浇注，既保证了塑件外壁不留浇注痕迹，同时也保证了模腔能获得均衡充填。脱模设计中，重点针对塑件内螺纹的脱模设计了液压马达驱动型内螺纹抽芯机构，保证了塑件内螺纹的无损脱模。为配合塑件的自动脱模，模具分4步开模打开，前3步打开用于流道废料和塑件部分脱模的顺序进行，第4步用于配合螺纹型芯的转动，辅助实现塑件内螺纹及内壁的脱模。塑件最终在顶针将潜伏式流道废料顶出后实现完全脱模。模具结构布置合理，机构选用可靠恰当，有较好的模具结构设计参考意义。     

旋转脱模的注射模结构设计

介绍了止水塞塑件的旋转脱模的注射模结构。该塑件具有M6mm内螺纹,其长径比较大,脱模难度较大,所设计的模具结构较好地解决了脱模问题。     

防伪上盖模具结构设计

叙述了防伪上盖注塑成型工艺及模具结构,为解决T型塑件内螺纹及腔内上部密封环的脱模,模具结构采用了多腔设置,推管式自动脱模,提高了生产效率。     

五星密封盖自动脱螺纹注射模设计

根据双螺纹密封盖结构特点,对自动脱螺纹模注射模结构进行了设计。重点分析和研究了模具的侧向抽芯机构、浇注系统、内螺纹自动脱模机构、定距分型机构和冷却系统。通过采用斜滑块抽芯和蜗轮蜗杆传动机构,顺利完成了塑件的外侧倒扣成型和内螺纹的自动脱模。实践证明:模具结构合理,注射过程中各动作稳定可靠。     

一种倒装式齿条脱螺纹注射模设计

针对汽车油箱盖的结构特点,设计了一种无顶出倒装式型芯侧点浇口进料的注射模。由液压缸活塞杆拉动齿条带动行星齿轮以带动内螺纹型芯旋转脱模机构,实现了塑件的自动化生产,模具为非标准8板模结构,1模4腔,设计了4套相同的螺纹脱模机构,同步实现4个塑件的内螺纹脱模要求。实际生产表明,该模具结构紧凑合理,可为同类塑件的成型模具设计提供参考。     

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.