基于网络的数控机床远程监控与管理系统设计与实现

介绍基于网络的数控机床远程监控与管理系统总体结构和基本实现方法。集成开发了基于网络的数控机床远程监控与管理系统,实时获取数控机床加工工艺参数、PLC信号、报警信息、伺服电流,在线管理加工程序、故障诊断、远程控制、维护机床信息等,实现了数控机床远程监控与管理。     

数控机床任务调度与刀具分配网络化管理系统

以提高机床生产率为目的,构建了大型数控设备网络化生产监控管理系统。在研究了数控机床生产任务调度和加工刀具跟踪管理方法的基础上,开发了包括数控刀库管理与调度、生产管理信息统计等功能的数控机床远程监控和网络化数据管理系统。介绍了该系统生产任务调度、生产状态监控、加工刀具管理等功能。     

基于Internet的数控机床远程控制

远程控制技术已逐步成为当代数控机床发展的主要趋势之一。文中给出了基于Internet的数控机床系统的硬件结构,并分析了软件实现方法。该数控机床可通过高速通信网络及时地向远程监控点提供当前加工状态信息并接收远程监控命令,从而实现数控系统的远程控制功能,具有很强的实用性。     

基于OPC UA的数控机床远程监控系统开发

介绍基于网络技术的数控机床远程监控与数据管理系统结构及实现方法。以C#语言设计并开发了一种基于OPC UA通信协议的本地机床加工监控客户端,实现了机床OPC UA服务器与本地监控系统的连接,对服务器中节点数据进行读取、写入,以订阅的方式实现对机床加工工艺参数、电流、电压和PLC信号等机床内部状态数据的实时监控;开发了监控数据库,可实现对监控数据的管理。最后采用PHP语言和ThinkPHP框架搭建了机床远程监控网站,用户可远程监控和管理机床内部状态数据。该软件具有更好的开放性,能够很好地与具有OPC UA接口的数控系统连接,能够较好地解决数控系统“信息孤岛”的问题,对提高机床智能化、数据可视化和网络化有实际应用意义。     

物联网与数控机床远程智能监控系统

文章将物联网技术应用到数控机床监控系统中,为提高我国数控机床监控系统水平和加工精度和效率.文章深入分析了物联网基本概念、体系架构、关键技术、主要面临的问题以及具体应用等方面,同时结合数控系统目前存在的不足之处进行了剖析.引入物联网技术应用到数控机床智能监控系统中,详细阐述了基于物联网的数控系统总体功能、机床信息终端的硬件体系结构、数据交换中心设计和机床监控中心等方面的设计与研究,建立物联网模型,提出了基于物联网的数控机床远程监控系统.随着物联网技术的发展,相信在数控系统中有着越来越重要的作用.     

数控机床远程监控系统的实现与优化

针对目前数控机床的实际需求,并结合监控系统发展趋势,提出了一种基于Internet的数控机床远程监控系统,设计了数控机床远程监控系统的结构,引入了嵌入式接口和基于OPC方式的系统接入方式,建立了远程虚拟驱动程序,并提出了数控机床数据传输和数据存储的实时方法.研究表明,该系统具有良好的通用性和兼容性,具有较高的实际应用价值.     

基于CAN总线的数控机床远程监控系统的设计与研究

CAN总线作为一种可靠性高、价格低廉、技术成熟、实现简单的现场总线技术在众多领域得到了广泛的应用。讨论CAN总线在数控机床远程监控系统体系结构中的作用,并将CAN总线网络与Internet结合,建立一种通过浏览器即可对数控机床进行远程监控、完成加工任务的系统。     

基于Android系统的数控机床实时监测研究

为了更加方便快捷地进行数控机床实时状态信息的远程监控,提高数控车间的智能化水平,提出了一种基于Android系统的数控机床实时监测的方法。用户可以在Android系统上快速清晰地掌握数控机床的运行状态。系统通过交换机和路由器搭建车间无线局域网,采用基于TCP/IP协议的Socket通信,以数控机床作为状态信息发送的服务器端,以Android系统作为信息接收的客户端,实现了Android系统对数控机床信息的实时采集。通过实验验证,在Android系统上很好的实现了对数控机床实时状态信息的采集。通过采集到的信息,车间管理人员可以准确了解整个车间的加工情况。     

数控机床智能监控与状态识别方法研究

实施数控机床远程监控,识别机床所处状态对提高机床利用率和产品加工质量具有重要意义。提出了一种基于最小二乘支持向量机的数控机床状态诊断处理方法,利用粒子群方法优化支持向量机算法识别诊断机床状态。构建了数控机床监测体系及监测信息的信号处理模型,给出了模型参数的确定方法。最后,对提出的识别处理方法进行了实验验证,实验结果表明所提出的处理方法对数控机床状态有较好的识别效果,具有较强的实用性。     

基于WEB的数控机床监控系统的设计与实现

针对数控机床远程监控的需求,设计了基于Web环境的数控机床远程监控系统,该系统通过无线传感器网络和现场总线对监测数据进行采集,采用ARM Cortex-M3芯片对数据进行处理,使用Socket和多线程技术完成基于工业以太网的数据上传和数据库的存取工作,利用Java、S2SH和Ajax技术实现基于Web的实时监控站点,最终实现了对数控机床的监测功能.该系统通过Web服务响应Web页面控制请求产生控制命令,调用多线程和Socket通信技术把控制命令送给CNC系统,完成了对数控机床的远程控制功能.     

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.     

Thermodynamics Study on the Decomposition of Chromite with KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

Influence of Heat Treatment on Damping Behaviour of the Magnesium Wrought Alloy AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

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).     

Using Finite Element and Contour Method to Evaluate Residual Stress in Thick Ti-6Al-4V Alloy Welded by Electron Beam Welding

This work was to reveal the residual stress profile in electron beam welded Ti-6Al-4V alloy plates(50 mm thick) by using finite element and contour measurement methods.A three-dimensional finite element model of 50-mmthick titanium component was proposed,in which a column–cone combined heat source model was used to simulate the temperature field and a thermo-elastic–plastic model to analyze residual stress in a weld joint based on ABAQUS software.Considering the uncertainty of welding simulation,the computation was calibrated by experimental data of contour measurement method.Both test and simulated results show that residual stresses on the surface and inside the weld zone are significantly different and present a narrow and large gradient feature in the weld joint.The peak tensile stress exceeds the yield strength of base materials inside weld,which are distinctly different from residual stress of the thin Ti-6Al-4V alloy plates presented in references before.     

Microstructures and Tensile Properties of Ultrafine-Grained Ni–(1–3.5) wt% SiC_(NP) Composites Prepared by a Powder Metallurgy Route

Silicon carbide nanoparticle-reinforced nickel-based composites(Ni–Si CNP),with a Si CNPcontent ranged from1 to 3.5 wt%,were prepared using mechanical alloying and spark plasma sintering.In addition,unreinforced pure nickel samples were also prepared for comparative purposes.To characterize the microstructural properties of both the unreinforced pure nickel and the Ni–Si CNPcomposites transmission electron microscopy(TEM) was used,while their mechanical behavior was investigated using the Vickers pyramid method for hardness measurements and a universal tensile testing machine for tensile tests.TEM results showed an array of dislocation lines decorated in the sintered pure nickel sample,whereas,for the Ni–Si CNPcomposites,the presence of nano-dispersed Si CNPand twinning crystals was observed.These homogeneously distributed Si CNPwere found located either within the matrix,between twins or on grain boundaries.For the Ni–Si CNPcomposites,coerced coarsening of the Si CNPassembly occurred with increasing Si CNPcontent.Furthermore,the grain sizes of the Ni–Si CNPcomposites were much finer than that of the unreinforced pure nickel,which was considered to be due to the composite ball milling process.In all cases,the Ni–Si CNPcomposites showed higher strengths and hardness values than the unreinforced pure nickel,likely due to a combination of dispersion strengthening(Orowan effects) and particle strengthening(Hall–Petch effects).For the Ni–Si CNPcomposites,the strength increased initially and then decreased as a function of Si CNPcontent,whereas their elongation percentages decreased linearly.Compared to all materials tested,the Ni–Si CNPcomposite containing 1.5% Si C was found more superior considering both their strength and plastic properties.     

Directional Growth of Tin Crystals Controlled by Combined Solute Concentration Gradient Field and Static Magnetic Field

A new method was introduced to achieve directional growth of Sn crystals. Microstructures in liquid(Pb)/liquid(Sn) diffusion couples were investigated under various static magnetic fields. Results show that the β-Sn crystals mainly reveal an irregular dendritic morphology without or with a relatively low static magnetic field(B0.3 T). When the magnetic field is increased to 0.5 T, the β-Sn dendrites close to the final stage of growth begin to show some directional character. With a further increase in the magnetic field to a higher level(0.8–5 T), the β-Sn dendrites have an enhanced directional growth character, but the dendrites show a certain deflection. As the magnetic field is increased to 12 T, the directional growth of the β-Sn dendrites in the center of the couple is severely destroyed. The mechanism of the directional growth of the β-Sn crystals and the deflection of the β-Sn crystals with the application of static magnetic field was tentatively discussed.     

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.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.