基于多色集合理论的产品装配序列规划研究

使用多色集合理论为产品装配建立信息模型，给出了装配基准的确定方法，并结合分层结构树图建立了产品分解图和装配图的生成算法。利用该算法可得到产品的可行装配顺序方案集合。最后结合实例给出了产品装配问题的求解思路。     

支持工艺设计的制造质量影响因素关系网多色集合模型

为了保证产品工艺设计方案在制造过程中顺利实现,提出将制造质量影响因素信息反馈到工艺设计过程,分析了制造影响因素信息对工艺设计的支持,建立了支持工艺设计的制造质量影响因素关系网.利用多色集合理论,能清楚表达集合统一颜色与集合元素之间关系的特点,建立了制造质量影响因素关系网的多色集合数学模型;基于此模型,设计了面向给定加工要求的多个可行工艺设计方案选择的流程和算法;并以齿轮中的齿形加工过程为实例,建立齿形加工过程元素的多色集合和多色图,给出了可行齿形加工方案选择过程.     

基于多色集合理论的机械零件加工路线方法研究

首先对箱体类零件典型加工路线进行了分析,介绍了当前箱体类零件的加工过程,接着提出了一种新的系统分析方法——多色集合理论.在分析了多色集合理论的基本思想及其相关概念的基础上,结合多色集合理论的特点,对机械零件产品加工工艺过程进行数学建模,通过建立递阶结构图,列出关系矩阵,求取零件加工方案,并结合实际经济效益选取最佳工艺路线.最后,通过具体的实例验证了此分析方法的有效性,为机械零件产品加工工艺方案的选取提供了新思路.     

基于多色集合的产品概念设计建模与方案优选方法研究

针对目前概念设计产品求解方法的不足,采用多色集合理论建立概念设计产品信息模型,实现概念设计产品模型的形式化表达。利用多色集合统一颜色与个人颜色等概念,建立产品模型中表达约束关系的布尔围道矩阵,实现从用户需求到不同产品方案组合的推理过程。针对概念设计方案优选问题,采用模糊理论将方案评价信息量化,利用层次分析法确定评价指标权重,提出一种基于模糊层次分析法和遗传算法的方案优选方法。以隔振系统概念设计为例,验证了文中概念设计产品信息建模和方案评价优选方法的有效性。     

多色集合与模糊遗传算法的机械产品概念设计研究

针对机械产品概念设计中的优化问题,提出了基于多色集合与模糊遗传算法相结合的方案推理及优化方法。首先运用多色集合理论,建立了描述复杂结构机械产品各组成元素间的层次结构和复杂约束关系的信息模型,以进行有效的方案推理。然后,将多色集合推理模型与模糊遗传算法相结合,实现了方案的评价及优化方案的搜索。以工业机械手的概念设计为例对该方法进行了验证,结果表明,该方法能有效地实现概念设计过程中的方案推理及优化,为复杂机械产品概念设计提供了一定的理论基础。     

基于产品结构树的汽车后桥车间布置方式研究

通过对传统的生产车间布置方法进行研究,提出了一种基于产品结构树的多色集合车间布置方法,建立了车间布局模型并给出了优化目标.最后以某企业厂房布置为例进行了验证,证明了该方法能较大幅度地减小车间物流费用,提高厂房面积利用率,具有很强的实用性,为解决多目标优化的车间布置问题提供了一个新途径.     

基于多色集合的冲压模结构的方案设计

应用多色集合理论提出了一种产品结构的设计方法,该方法应用多色集合的围道布尔矩阵表达功能模块元素和结构元素之间的映射关系,用有向关联图表达结构元素之间的配合约束关系,通过有向关联图中的可达路径及其围道性质获得所有可行的结构设计方案,这些方案能够同时满足产品的功能要求和结构配合约束.并用这种方法完成了冲压模的结构方案设计.     

坐标测量信息多色集合层次结构表示及获取

为了提高坐标测量信息的获取效率并保证信息的完备性,引入多色集合理论,探讨了一种全三维环境下的测量信息表示及获取机制。通过分析全三维环境下测量信息构成及特点,建立测量信息多色集合层次结构模型。依据该模型,建立测量信息获取推理关系矩阵,用于确定每个待测公差项目的公差类型、与之相关的几何要素、以及对应的几何参数。根据测量信息获取流程,基于UG NX系统,定制了信息获取工具,并通过实例验证了基于多色集合进行测量信息表示与获取的可行性。     

产品协同设计过程的资源配置

现代产品的功能和结构日趋复杂,使其设计过程具有复杂的动态性,科学、合理地进行产品开发项目规划和资源配置是解决上述问题对重要手段."设计者"作为一种特殊资源,其配置结果决定了产品开发的成败.为合理配置该资源,建立了资源的组织模型,借助多色集合理论对其进行形式化表达;提出资源静态配置步骤,并以资源的综合设计能力为指标,构建了资源静、动态配置的数学模型;最后进行实例应用,脸证了该算法的可行性.     

空调压缩机连杆双工位精镗夹具

在对冰箱压缩机连杆进行结构分析的基础上,介绍了一种用于精镗连杆的双工位夹具的结构及动作原理、着重讨论了夹具设计的要点.连杆的定位、压紧点的选择,定位、支承点材料的选择和热处理要求,以及压紧结构的浮动和浮动量的控制,确保工件定位和压紧点的一致性,从而保证了零件的加工精度.夹具结构简单,操作方便,通过更换定位压紧部件,可作到多品种共用一副夹具的功能.     

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.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

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.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.