基于知识工程的冷冲压模具设计系统

以易拉罐模具作为原型结构,提出了一种基于知识工程的冷冲压模具设计系统的体系结构。采用面向对象的设计思路和前后台程序分离实现思路,用分层次设计的方法设计了该系统的结构编排和软件构架。模具设计人员可以结合知识库中存储的相关知识,采用基于实例的推理技术,对系统中已经存在的原有模具结构进行快速的变形设计,以实现设计过程的智能化、数字化,从而大大缩短了模具设计的时间,增强了企业市场的竞争能力。系统软件可以正常运行。     

基于KBE的多Agent分布式模具协同设计框架

针对传统串行模具设计方法的不足,构建了一种具有三层结构的、基于多Agent的模具协同设计系统框架,并阐述了在该框架下的模具协同设计工作流程.论述了协同环境下面向模具设计的知识库结构,采用自动和非自动结合的方法获取知识,介绍了模具工艺设计知识和结构设计知识的表示方法.分析了Agent技术的特点,将Agent各组成模块在协同设计系统框架中的功能作了详细的说明.将KBE技术和Agent技术引入模具协同设计系统中,可大幅度提高模具设计的质量和效率.     

基于开放式知识库架构的热塑性成型设计系统

建立了基于开放式知识库架构的热塑性成型工艺与模具设计系统,系统的动态相关静态独立设计思路、系统性和独立性并存的特征、与几何造型无关和基于知识的成型工艺与模具快速集成设计技术使得该系统在工艺和模具设计过程中能够有效地利用已有经验和知识,指导设计人员完成设计.     

基于本体的模具设计知识管理系统的研究

针对我国模具制造业的现状及其对知识管理的需求,提出了构建基于本体技术和语义网的模具设计知识管理系统.通过对系统的4个基本功能模块及其关系的分析,建立了模具设计知识管理系统的运行模型,并基于对模具领域设计知识本体的描述,奠定了相关的模具知识量化处理的计算基础.从而使系统实现了模具设计知识库的管理、设计知识的查询和搜索、知识的重用和过程记录以及过程记录中的知识处理等功能.通过对基于本体的模具设计知识管理系统的研究开发和应用,将为我国模具制造企业实现信息化、知识管理以及进一步提高竞争力提供切实可行的途径.     

知识系统设计及其在压铸模智能CAD中的应用

将面向对象的知识表达方法应用于压铸模具的智能CAD系统中.将设计对象的属性、处理过程、启发性知识统一表示在对象结构中.模具设计的领域知识通过多重继承来实现.在知识系统的基础上完成了压铸模具的智能CAD系统设计.     

钣金冲压模具快速设计系统的研究与开发

为实现冲压模具快速设计建模,本文采用对CATIA软件进行二次开发的方法,创建一个独立的冲压模具设计系统。该系统模块化的划分了模具设计的整个流程,使用此系统用户以交互式方式选择模具设计的具体要求和参数,系统便能依据相关的知识模板推理构造出符合特定要求的模具三维数字化几何模型,同时实现模具信息的管理和工程的管理,完成一整套模具模型设计。本系统能从实质上改变了传统的模具设计方法,避免大量的重复工作,有效地提高了模具设计效率。     

基于KBE的摩托车注射模快速响应设计

模具设计是摩托车新车型迅速推向市场的关键，针对现有模具设计软件存在的问题，提出基于KBE（Knowledge Based Engineering，基于知识工程）技术的摩托车注塑件模具快速响应设计技术，详细阐述了模具设计中KBE的特点和关键技术，并对快速响应设计的内涵和实现进行了深入探讨，提出基于KBE模具快速响应设计的系统整体思想、KBE设计构架和具体设计流程。     

基于模块化的冲压模具CAD系统开发

模块化设计技术可以缩短产品的设计与制造周期,是快速响应设计的核心。文章从冲压模具的模块化设计方法出发,分析了冲压模具的结构和设计特点,论述了基于模块化的冲压模具功能零部件的规划、基于模块化的冲压模具设计过程。最后给出了冲压模具CAD系统的功能结构,并对其具体功能进行了描述。冲压模具CAD系统应用模块化技术可以优化模具的设计与制造,提高模具设计的标准化水平及快速响应能力。     

基于SolidWorks的精密冲裁模CAD系统研究

针对目前精密冲裁模设计过程中工作量大、修改不方便、结构不合理、不支持干涉检查等问题,研究开发了基于SolidWorks的三维精密冲裁模具CAD系统.论述了基于SolidWorks的精密冲裁模CAD系统开发方法和系统开发过程中的关键技术,包括参数化建模技术、基于设计表的模具标准件库管理技术和基于知识的冲压工艺及模具设计方法等.建立了精密冲裁模具CAD系统的总体结构,并通过实例验证了系统的实用性和先进性.     

基于混合推理的涡轮叶片精铸模具智能设计

通过对航空发动机涡轮叶片精铸模具设计内容和领域知识特点的分析,提出以CBR(Case-based Reasoning)方式进行初步设计,RBR(Rule-based Reasoning)方式进行设计修改的精铸模具智能设计推理模型.针对精铸模具方案设计阶段的CBR推理,研究实例表达及检索技术,有效提高推理效率,在CBR基础上,采用RBR对设计方案进行修正改进.提高精铸模具设计质量.实例验证表明,所提出的相关算法为实现精铸模具设计的智能化提供了新的思路.     

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

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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.