RG-150系列数控折弯机液压系统改进

本文介绍了RG-150系列数控折弯机液压系统的工作过程,提出了采用数控变量泵的改进方案.     

IB02-100型全自动塑料瓶注吹成形机液压系统设计

介绍了IB02-100型全自动塑料瓶注吹成形机的结构特点及工作过程.给出了该机的液压系统设计方案,运行的情况表明此液压系统的设计是可行的.指出了设计中存在的不足及改进的思路.     

液压驱动惯性系统能量回收的节能试验研究

针对液压驱动惯性系统提出了电容储能式液压马达能量回收的节能方案.搭建了液压马达能量回收试验台,进行了能量回收过程中的能量转化效率和节能效果的试验研究.试验结果表明,在液压驱动惯性系统中采用液压马达进行能量回收和发电机转速控制执行元件运动速度的节能方案是可行的.     

发射装置冲击振动的液压系统变阻尼控制

以某新型多管火箭武器在研制过程中高低机和方向机分别拟采用电液伺服阀控制的液压油缸和低速大扭矩液压马达组成的液压式驱动发射装置为研究对象,建立了可控液压阻尼的流体力学分析模型,研究了液压系统变阻尼与发射装置的冲击振动响应的关系.提出了基于液压系统的多管火箭发射过程中变刚度和阻尼的动态响应控制方案,并对4种不同的控制方案进行了比较,得到了最优的控制方案.     

薄壁管件液压成形仿真研究

介绍了管件液压成形的基本原理及其相对传统工艺的优点,论述了管件液压成形有限元仿真的理论基础和方法.以薄壁管件为研究对象介绍液压仿真的一般实现过程,在计算机上预测了初始液压成形工艺方案可能产生的缺陷,提出了液压成形工艺方案的改进措施.研究表明,仿真技术为管件液压成形分析与模具设计制造提供了一种有效手段,有利于减少试模或修模次数.     

联合收割机收割分离液压系统的性能监控研究

鉴于联合收割机作业工作部件较多以及故障率高等特点,对联合收割机割台、螺旋输送器、脱粒滚筒等收割分离液压部件进行工作性能监控研究。基于联合收割机的工作过程,概述了联合收割机收割分离液压系统的工作原理。设计了收割分离液压系统的监控方案、控制面板和控制器架构,研究了收割分离液压系统的控制方案;基于LabVIEW软件设计了监控界面,并通过田间试验验证了该性能监控系统的可行性。结果表明:所设计的性能监控系统能在联合收割机田间作业过程中正常运行,可靠性高,满足田间使用需求。     

TL345J铰接式自卸车液压系统设计

在分析TLJ345铰接式自卸车转向机构、工作机构和制动装置特点的基础上,提出了该车液压系统的组成方案,详细阐述了转向、工作和驻车制动液压系统的工作原理和设计计算,以及关键液压元件的选型.仿真测试表明TL345J铰接式自卸车液压系统的设计方案是合理可行的.     

液压制动系统协调控制下电动汽车制动系统研究

为提高电动汽车制动过程的稳定性,分析了电动汽车电机的制动和液压制动的过程,并依据电动汽车制动转矩的要求,提出了电机制动与液压制动模式的切换方案及制动转矩的协调控制方案。利用仿真软件平台建立了电动汽车电动液压制动系统仿真模型,通过改变制动强度,获得了电动汽车制动稳定性数据。分析结果表明:对于低强度制动工况,电机制动系统可有效满足汽车制动的需要,而液压制动系统无法达到相应工作要求;对于中等强度制动工况,电机制动系统及液压制动系统可有效协调工作,并实现稳定制动过程;而对于高强度制动或高蓄电池SOC工况,采用电动液压制动系统可有效保证车辆的制动稳定性。     

基于液压支架用阀试验的ZJFJ 2型试验台液压系统的设计

介绍ZJFJ-2型液压支架用阀静压试验台的液压系统的总体设计,分别详细阐述了以乳化液、机械油两种不同介质作为液压动力源的双系统的设计过程及设计后液压系统的大致工作过程。按照给定的试验方案,对煤矿液压支架用阀进行了性能试验和出厂检验。试验结果表明:该液压系统运行稳定可靠、操作方便、数据测试准确,能够满足用户的要求。     

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.     

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

正~~     

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.