自动上粕机液压系统设计

介绍自动上粕机液压系统的主要功能和设计原理。在分析自动上粕机液压系统动作和功能的基础上,提出该液压系统的设计方案,详细阐述了液压系统回路设计过程以及工作原理。经实践测试:该液压系统工作运行平稳,各项性能可满足自动上粕机作业需求,具有良好的市场应用前景。     

液压拉深机的嵌入式控制系统设计

针对传统液压拉深机的计算机数控改造需求,构建了一个高性能的实时嵌入式控制系统。该系统硬件采取多种抗干扰措施,软件具有友好的人机界面和便利的工艺数据库管理功能。对嵌入式控制系统的硬件设计方法、驱动程序开发、控制软件开发、液压伺服控制方法等关键问题进行了探讨。测试结果表明,该控制系统能够充分满足液压拉深机复杂工艺的控制要求。     

压力控制阀CAT系统研究

压力控制阀主要用来控制液压系统中液流压力.本文分析了压力控制阀的各种静态性能指标和动态性能指标,并根据压力控制阀性能测试要求,设计出了测试液压系统回路和CAT测试系统.该测试系统采用上下位机分级式结构,实现抗干扰和数字滤波功能,系统稳定可靠,具有较强的实用性.     

圆盘回转式压块机液压系统设计与仿真

通过分析现有压块机的踩压机制和曲块的踩压工艺要求,设计圆盘回转式压块机的液压系统,利用Simulink对液压系统进行建模和仿真,得出了油缸的运动特性,为液压系统的设计提供了理论依据。     

码头行人踏板液压系统设计

介绍了码头行人踏板液压系统的主要功能和设计原理。在分析行人踏板运动过程中液压缸承受着变化的正、负负载工况的基础上,提出了该液压系统和控制系统的设计方案,并从设计要求和技术参数着手,详细阐述了液压系统参数的确定、液压元件的计算和选择、安全保护措施,并对液压系统进行了调试与试车。经实践测试:该液压驱动系统速度、背压稳定,运行平稳,各项性能满足行人踏板设计要求。     

扒渣机液压系统设计与仿真分析

针对ZWY-120/55L型扒渣机结构组成及功能需求,进行了基于LUDV的扒渣机液压系统设计。利用AMESim模块化仿真平台,建立了扒渣机液压系统的仿真模型,并进行了关键部件和系统动静态性能的仿真与分析。仿真结果验证了液压系统的可行性和正确性,为扒渣机液压系统的设计与优化提供了依据。     

基于AMESim软件的散热器片冲裁机液压系统设计

散热器片冲裁液压系统在散热器片生产中起重要作用,其工作性能直接影响着生产线的效率和产品的质量。该散热器片冲裁机液压系统是由冲裁回路和支撑回路组成,利用液压缸的往复运动来实现冲裁机的冲裁动作。根据设备要求,设计出适合主机的液压传动系统,并在AMESim环境中建立了该液压系统的仿真模型,对其动态特性进行了仿真分析,验证了方案的可行性。该液压系统现已通过调试投入生产,运行状况良好。     

连续管测井机注入头液压系统的设计

注入头是连续油管测井机的核心部分,其液压系统采用目前先进的电液集成控制技术,实现模块化、集成化设计,提高连续油管测井机的自动化水平.根据连续管测井机注入头的主要功能和技术要求以及连续管测井作业的工艺特点,液压系统方案中,设计满足负载特性要求的主驱动回路和辅助驱动回路.在此基础上,应用自动控制技术,实现连续管测井机工作过程的自动化.实验结果表明:连续管测井机注入头液压系统工作可靠,是一种理想的连续管注入头液压系统.     

某车载雷达的液压系统设计

根据机械传动和液压传动各自的特点,在本车载雷达中采用液压系统,并按车载雷达的总体方案要求进行了液压系统的设计与计算。实际使用表明：该液压系统完全能满足设备功能要求,能适应恶劣环境的条件,工作可靠。该车载雷达具有机动性好、架撤时间短、操作方便等特点。     

200吨弹簧加箍机液压系统的改进

我厂200吨弹簧加箍机是紧箍板弹簧用的。该没备有立、卧两个液压缸,其液压系统原设计为增压器传动。该液压系统有压缩空气和高压油两套分配阀,结构比较复杂,通路较长,泄漏机会多,功能效率低。增压器的空气活塞尺寸大(φ800毫米),用牛皮碗密封,耗用大量牛皮,且密封常易泄漏,造成压力不足,常不能满足工艺要求。为了充分发挥老设备的生产潜力,我厂工人以大庆人为榜样,敢于革新,对200吨加箍机液压系统进行了改造,把增压器传动改为高     

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.