基于Pro/E的叶轮三维造型及模具设计

Pro／E软件具有强大的三维造型功能，特别适合于复杂曲面。利用Pro／E软件的零件设计模块功能中的旋转特征，扫描混成特征，阵列特征，切割挤出特征，切割旋转特征，倒角特征设计出了导轮三维造型图，并且完成了叶轮压铸模的结构设计。     

基于特征的阿基米德蜗杆(ZA)的参数化造型设计

在对阿基米德蜗杆的加工过程进行分析的基础上，采用Pro／E模拟其机械加工过程的方法，进行蜗杆齿轮段的几何造型和蜗杆轴的三维实体模型和特征模型的构造。并基于Pro／E实现阿基米德蜗杆的参数化造型设计，使设计人员能方便快捷地实现阿基米德蜗杆的三维特征造型设计，从而提高设计效率和精度。     

基于Pro/E特征建模研究与实现

针对机械设计中存在的设计手段落后、设计效率低下等问题，应用基于特征的参数化造型软件Pro／E对零件进行参数化造型，对造型设计技术要点进行了探讨，通过斜齿轮特征建模实例，实现了基于Pro／E的参数化特征建模。提高了设计效率。     

基于Pro/E平台的整体涡轮造型及阴极设计

周Pro／E造型软件对整体涡轮进行三维造型，在此基础上。进行阴极设计，并利用Pro／E软件的Nc功能对加工轨迹进行验证，为整体涡轮的数控展成电解加工提供了技术支特。     

基于Pro/E二次开发的冒口参数化设计

目前我国Pro／E应用日益普及，而二次开发严重滞后，本文介绍了在Pro／E环境中，以Pro／Toolkjt为接口．Visual c＋＋6．0作为编程语言，对其进行二次开发的方法。给出了冒口参数化造型设计的实例，深入分析了三维参数化设计的原理及基于Pto／Tool k1t的Pro／E参数化二次开发的关键步骤及技术，详细阐述了基于Pro／Toolk1t的Pro／E二次开发的机械零件参数化设计的实现过程。     

基于Pro／E二次开发的冒口参数化设计

目前我国Pro／E应用日益普及,而二次开发严重滞后,介绍了在Pro／E环境中,以Pro／Toolkit为接口,VisualC＋＋6．0作为编程语言,对其进行二次开发的方法。给出了冒口参数化造型设计的实例,深入分析了三维参数化设计的原理及基于Pro／Toolkit的Pro／E参数化二次开发的关键步骤及技术,详细阐述了基于Pro／Toolkit的Pro／E二次开发的机械零件参数化设计的实现过程。     

基于Pro/E音箱前面板注射模CAD/CAM

Pro／E是功能强大的三维参数化造型软件，以音箱注射模为例，说明了Pro／E软件在模具设计与制造中应用的优越性。     

基于Pro／E二次开发的支架落料冲孔模具设计

讨论了应用三维造型软件Pro／E及其二次开发包Pro／TOOLKIT对冲压模具进行参数化设计的问题。着重研究了Pro／E与VC接口的实现方法和Pro／E二次开发的基本过程,最后以安装支架落料冲孔模为例介绍了冲压模具的设计过程。该系统的研制、开发缩短了模具的设计周期,极大地提高了设计人员‘的工作效率。     

基于Pro/E的三维铸造工艺CAD系统的设计与实现

Pro／E本身具有较强的三维实体造型功能,采用Pro／E自带的二次开发软件包Pto／Toolkit,以及Visual C＋＋的一个重要软件资源MFC,充分利用VC开发环境提供的先进工具,实现了程序界面的可视化设计,并建立了铸造工艺参数数据库,实现了对数据的调用、修改、添加和删除等功能,与Pro／E的UDF结合,以Pro／E为平台开发出了一款三维铸造工艺CAD系统。     

Pro/E环境下桶底的三维建模及模具设计

Pro/E软件具有强大的三维造型功能，特别适合于复杂曲面。本文主要使用了Pro/E零件模块中的旋转、混成、阵列、切割、倒圆等实体特征和Merge等曲面特征，构造出桶底的三维数据模型。在此基础上，完成了桶底的注塑模设计。     

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.     

电化学噪声数据处理方法概述

综述了常见的电化学噪声数据处理方法,介绍了直流趋势剔除、统计分析、快速傅立叶变换(FFT)法计算功率谱密度(PSD)以及小波变换处理电化学噪声信号的基本过程,并阐释了各种数学处理及所得参数的物理意义。