基于ARM的伺服压力机网络控制系统设计

根据曲柄压力机工艺特性和伺服电机工作原理,提出了基于ARM的网络控制系统,并对系统相关软件构成做了详细的设计和分析。嵌入式开发平台采用低成本、高性能的Tiny6410和STM32F103,人机界面使用Qt和OpenCV开发,系统可以在远程终端控制加工现场并监控产品质量,人机界面可实时显示当前电机运行状态。该设计可为后续实现无线网络控制提供实践参考。     

基于840D数控系统的人机界面二次开发

基于西门子840D数控系统提供的人机界面软件和开发环境,利用面向对象的编程语言VB进行人机界面的设计,利用VC建立语言动态链接库,将用户的特殊界面及加工方法集成后嵌入西门子系统.开发的钻铣类机床的专用操作界面已在计算机上模拟成功,并在实验室的数控机床上进行了验证.     

基于DSP的电阻点焊人机界面的软件开发

基于DSP5402的控制模板开发了一个简易的电阻点焊人机界面。首先对DSP控制模板和集成开发环境进行了介绍,针对电阻点焊人机界面的功能要求规划程序框架,然后根据功能需要对键盘输入模块、液晶显示模块和通讯模块分别进行了软件编程与调试,最后将各程序模块按功能要求分层次调用而编辑成一个总程序,并部分列出了各层次的程序框图。经对总程序的调试与实际应用,结果表明开发的电阻点焊人机界面是可行的。     

基于Windows CE的数控磨床系统软件的开发与研究

文章首先对基于ARM的数控磨床系统进行了专门的研究.并以Windows CE作为软件开发平台,运用Embedded Visual C++开发工具设计出系统的人机界面以及整个软件平台.主要论述了WinCE操作系统的定制,文件系统以及编译模块的设计.并且,给出了数控磨床系统的人机界面与软件系统的设计及开发方案.最后.完成整个软件系统的开发.     

PCS7过程控制在工业汽轮机控制系统中的应用

对工业汽轮机数字电液控制系统进行了详细的研究与阐述,分别对工业汽轮机调速系统、监视系统、保护系统进行了设计.选用PLC 为控制系统的核心,控制系统采用双闭环方式,提高了控制系统的快速响应性.对汽轮机检测系统进行了选型、计算及测点布置,根据控制需求对PLC控制系统进行了硬件和软件的设计,开发出了友好的人机界面.     

GMAW-P数字化焊机人机交互系统的设计

该设计是数字化焊机电源研究的一部分,主要研究数字化的人机界面,即输入、显示、存储子系统,采用了ATMEL的AT89C52作为主控元件,8279作为键盘控制芯片,LED数码管作为焊接参数的显示屏,FM24C64 Flash RAM作为参数存储芯片,实现焊机的参数输入和显示、存储的数字化.主要对GMAW-P数字化焊机的人机界面进行硬件和软件设计,在焊接过程中,实时显示焊机电流、电压等参数,并增加了用户自定义功能.实验证明设计中的人机界面操作简便、实用.     

西门子SIMOTION D在直角坐标机器人中的应用

阐述了一种直角坐标机器人的主要结构及其功能,并阐述了该直角坐标机器人控制系统的硬件结构及工作原理。针对其功能具体开发了控制程序及系统组成。系统采用人机界面与运动控制器相结合的控制方式,人机界面作为上位机,实现对坐标机器人的操作和参数修改及设备状态、故障报警显示等,以SIMOTION D运动控制器为系统控制核心。在设计过程中硬件和软件都采用了模块化的思想,使控制系统具备开放性和可移植性的优点。     

汽车液压制动系设计计算系统的设计

为减轻设计人员的计算工作量,提高制动器的设计效率和质量,设计开发了一套汽车液压制动系设计计算系统.提出了汽车液压制动系设计计算系统的体系结构,把系统分为4个模块:参数输入模块、制动系设计计算分析模块、结果输出模块和数据库管理模块.详细地讨论了系统实现的3个关键技术:参数约定、制动系计算分析模块的内部实现、人机界面的实现.最后,通过一个运行实例说明了该系统具有友好的人机界面,设计计算结果正确,完全能够应用于生产实际.     

基于Proteus的焊接电源人机交互系统设计

焊接电源人机交互系统采用DSP+MCU双处理器实现了焊接电源的数字化.在Proteus环境下结合Keil工具,对基于STC89C52单片杌控制的人机交互界面系统进行了电路设计、程序开发和仿真调试.用户通过人机界面不仅可以设置焊接电流、焊接电压、焊接速度等参数,而且还具有实时数据显示功能.实验结果表明,所设计的系统能够满...     

基于知识库的压铸模具专家系统

以压铸模具优化选材、结构设计及模具报价等权威知识和专家经验为基础,建立了压铸模具材料知识库、设计知识库和报价知识库,设计了主要由选材模块、设计模块、报价模块和知识模块组成的人机界面,通过人机界面与知识库的连接,最终开发出了压铸模具专家系统。     

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.     

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).     

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.     

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.     

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.