轴类零件实用CAPP系统研究与开发

CAPP作为CAD/CAPP/CAM集成的重要环节,目标是实现工艺编制自动化.而获取零件特征信息是编制规范化工艺方案的关键.相似零件特别是轴类零件具有相同或相似的特征信息.在研究分析CAPP系统优势及国内外发展现状的基础上,提出适合轴类零件的CAPP系统,该系统应用相似零件组的典型工序模板.具体零件所需工序在典型工艺模板基础上进行优化得到,由零件的特征尺寸信息,根据尺寸反推原理就可以得到完整的工艺规程.     

箱体类零件CAPP与NC编程集成系统研究

文章从分析箱体类零件CAPP系统的特点出发,在系统研究箱体类零件的信息描述、加工特点的基础上,开发出实用型CAPP系统——NDCAPP系统。该系统主要应用在柔性制造单元的箱体类零件加工。NDCAPP系统以特征造型技术为基础,提出了“基本实体 方位特征”描述法,并把零件信息存储在专用的数据库中,在自动生成工艺过程和NC加工代码时,直接从数据库中读取几何信息,并自动转换为加工所需要的坐标信息,较好的实现了CAPP/NC编程的集成。     

面向工艺决策的箱体零件特征信息模型的研究

文章对面向工艺决策的箱体零件特征信息模型进行了研究,论述了面向工艺决策的完整的零件信息模型在CAPP系统中的作用,论述了面向工艺决策的完整的零件信息模型的内容和要求,以箱体零件为例,对箱体零件的工艺设计过程和规律进行分析,依据零件工艺决策的要求,按照CAPP系统的结构,提出了箱体零件特征信息模型的总体结构,重点阐述特征层的组织和表达,提出了将特征层信息用图的形式加以描述,以方位为单元,以基本特征+组合特征的混合特征为特征单位,基本特征和组合特征内部再分解成简单特征子图,用边表达特征间的关联关系,建立面向工艺决策的箱体零件特征信息模型.     

基于规则的汽车覆盖件孔和翻边特征识别方法研究

特征识别技术是提高汽车覆盖件制造水平,实现CAD/CAPP/CAM集成的关键.在研究了汽车覆盖件自由曲面特征识别技术的基础上.提出了孔类和翻边类特征的表示方法,并采用基于启发式规则的特征识别算法,实现了汽车覆盖件自由曲面上的孔类和翻边类特征的自动识别.并以UGⅡ软件为平台,开发出汽车覆盖件零件模型自动特征识别功能.     

箱体类零件铸造工艺CAD系统研究

针对箱体类零件铸造工艺特点,兼顾系统的通用性和可扩充性,搜集并归纳整理了箱体类零件铸造设计方面的有关工艺信息、零件特征信息;对箱体类零件的材料、结构及用途进行分析,得出了箱体类零件成形方法的选择依据,箱体类零件铸造工艺设计规律特点;建立了箱体类零件铸造工艺设计实例库.     

基于人工神经网络的箱体类零件的CAPP系统及关键技术

将人工神经网络应用于箱体类零件的CAPP系统中，简化了零件的信号识别和分类；工序图是箱体类零件的CAPP系统的一个关键技术，本文探索一种有效的绘图方法，使箱体类零件的CAPP系统能自动生成工序图。     

基于特征的三维CAD/CAPP集成系统设计技术研究

CAD/CAPP/CAM集成是CIMS工程中重要技术单元.这里依据Pro/E提供的二次开发工具Pro/Toolkit,运用基于零件特征的描述方法实现了CAD/CAPP的集成,利用动态链接库(DLL)方式实现了VC++.NET的MFC类库对应用程序用户界面的开发,并给出了基于特征的CAD/CAPP集成系统的总体结构.最后对零件特征的识别与提取、基于关系数据库的特征加工链生成和CAPP工序图的自动生成等关键技术做了深入的研究.     

基于SolidEdge的集成化CAD/CAPP系统开发

实现CAD/CAPP的无缝连接是计算机集成制造的关键.基于SolidEdge平台开发集成化CAD/CAPP系统,实现了特征识别、特征参数与约束提取、特征树重构、工艺信息补充、辅助工艺决策、自动工艺标注与毛坯生成等功能.最后以实例验证了系统的正确性和实用性.     

面向可制造性评价的航空发动机叶片零件信息模型研究

针对可制造性评价的工程需求,基于广义特征和STEP标准建立叶片零件信息模型,并在UG软件二次开发的基础上,实现了一个基于特征的CAD系统.基于所建立的零件信息模型,系统可自动生成STEP文件,为设计的后续可制造性评价提供丰富的叶片零件信息,便于实现CAD与后续过程的集成和并行.利用建立的叶片零件信息模型,实现了CAD/CAPP/DFM的信息集成.     

轴类零件CAD／CAPP集成系统的开发

本文根据模块化设计思想，以Visual C 6.0和Visual LISP等语言为工具，开发了基于面向对象程序设计方法的轴类零件CAD与CAPP集成系统软件，其设计思路和实现手段对开发其它零件的CAD/CAPP系统同样具有很大的推广价值。     

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 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.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.