基于设计知识库的CAD和PDM集成

为满足产品快速设计的要求,在设计知识库的基础上对计算机辅助设计(CAD)与产品数据管理(PDM)系统的集成进行了研究.在对产品信息模型的定义基础上构建了由产品需求决策知识、产品结构知识、产品配置知识、产品的特征知识和产品设计资源组成的产品设计知识结构,并且将机器学习中的决策树和加权聚类算法用于产品设计过程中的知识推理和设计决策,实现了基于知识的产品需求、配置和变型设计过程,并且用设计知识库作为CAD/PDM系统的集成平台,实现了基于知识的CAD系统和PDM系统的信息集成和数据交换,从而提高了产品开发设计的效率.以变速箱设计为例,证实了该集成系统对产品快速设计过程的支持.     

基于产品结构的CAPP系统研究与开发

随着企业信息化建设工作的深入进行,CAPP系统应能实现产品信息集成和共享.为此,提出了基于产品结构的CAPP的思想,阐述了基于产品结构的CAPP系统体系结构,分析了该系统的特点.开发了基于产品结构的CAPP系统,详述了产品结构管理及工艺设计模块的实现方法.实际应用表明：该CAPP系统不仅能满足工艺设计工作的需要,而且便于与企业其它部门实现信息共享.     

基于MBD技术的模具设计与制造

介绍了基于模型的定义(model based definition,MBD)技术的模具设计与制造过程,用集成的三维实体模型来完整表达产品定义信息,将三维产品设计信息与制造信息共同定义到产品的三维数据模型中,在产品的整个生命周期中,以主模型为唯一的数据传递形式,使用三维标注模型作为制造依据,真正实现模具设计、制造和检测的协同,达到缩短模具生产周期,提高企业效益的目的。     

铸造企业用PDM系统功能设计及其实现的关键技术

根据铸造企业的特点设计了一套适合铸造企业使用的PDM系统,并对其实现的关键技术进行了论述。系统主要包括了图文档管理、原材料技术指标管理、产品属性管理、成套产品装配、配料管理、工装模具管理和产品质量统计等多项功能。系统也考虑了与CRM、ERP等其他管理信息系统的集成。文中对实现系统的关键技术和软硬环境也作了论述。该系统消除了各车间、各工部的信息孤岛,提高了企业信息的共享性和完整性,对铸造生产工艺流程和铸件质量的管理和控制起到重要作用。     

用友ERP生产制造解决方案

用友ERP生产制造系统由精益制造控制、快速产销规划和产品设计集成三个子系统形成有机的企业管理,整合企业的物流、资金流和信息流,使企业内部的信息能够充分统一和共享,从而提高了企业核心竞争力,增强了企业的应变能力.     

基于UG二次开发技术的PDM/CAM集成方法研究

基于企业应用集成原理,提出一种产品数据管理(Product Data Management,PDM)系统与CAM系统集成的方法。利用基于MFC的UG二次开发技术,将PDM系统嵌入UG软件,实现了PDM与CAM系统之间的软件操作功能交互与数据传递,在PDM集成框架下同时进行工艺数据管理与数控工艺编程。该方法提高了企业产品信息集成管理水平,加快了产品开发效率。     

工业锅炉精益型集成制造系统与信息再集成

以信息集成技术为基础,提出并实施“工业锅炉精益型集成制造系统“BLIMS.该系统通过网络环境下的计算机辅助设计/分析/制造/资源管理(CAD/CAE/CAPP/CAM/ERP)等硬、软件开发和应用,使产品信息能够及时、准确地交换和传输.并通过改进基于信息约束的产品开发过程,实现产品制造信息再集成,从而为企业赢得市场,带来经济效益.     

面向ERP与CAD集成的液压缸产品图库管理系统研究

针对目前ERP信息管理系统与CAD产品设计系统之间信息集成度不高的问题,以液压缸生产为背景,设计并开发了一种面向ERP与CAD集成的产品图库管理系统。将CAD设计图纸的物料信息识别提取到ERP系统的数据库中,并自动生成特殊的产品BOM表样式,将每个产品的整套CAD设计图纸与其订单合同信息绑定,以便生产人员能实时检索浏览所需图纸;然后根据液压缸的设计参数将典型产品对应的图纸进行分类标准化管理形成企业基型产品清单和标准图库,以便设计人员据此快速完成新产品的设计。     

数控车间DNC与MES集成技术研究与系统开发

数控车间DNC系统是设备层信息化管理的一种典型网络结构,而生产管理层常用的MES系统需要完善的车间现场信息才能有效运行,所以有必要进行DNC系统和MES系统的集成,实现企业管理层与设备层之间的信息交换.提出了一种数控车间DNC与MES的集成模型,构建了系统的通信网络,在此基础上设计了系统软件,实施了INTEG-DNC与某重工集团MES系统集成项目,证明了该模型和网络结构的有效性.     

面向服务的模具企业CAD与ERP集成系统研究

针对模具行业普遍存在的CAD与ERP系统的实时信息共享问题,提出了面向服务架构的信息集成框架.该框架采用企业服务总线作为主要集成技术,结合Web服务技术、基于数据事件流的数据处理技术以及规则引擎技术,实现CAD与ERP集成系统.该系统解决了CAD与ERP系统间物料清单(Bill of Material)信息的同步共享与更新问题,保证了系统间的数据一致性和信息透明性.     

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.     

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。