焊管轧辊特征造型系统的研究与开发

简述了焊管轧辊三维特征造型技术的原理,并以VisualC++6.0为开发语言,在MDT环境下,利用AutoCAD中ObjectARX面向对象的开发技术,采用基于轧辊形状特征的原理,综合利用参数化设计技术,开发出焊管轧辊特征造型系统从而实现了轧辊孔型设计轧辊零件参数化绘图及三维特征造型设计的一体化     

基于参数化特征造型的三维冲裁模标准件库的建立

阐述了基于特征和约束的参数化驱动技术建立图形库的方法 ,并对采用此方法在MDT3.0环境下开发的三维冲裁模标准零件库系统的结构和特点作了介绍。     

用ObjectARX开发基于AutoCAD 2002冲模标准件库

介绍了在AutoCAD 2002 for Windows98／2000平台下，利用VC 6．0和ObjectARX编程来开发冲模标准件库的方法，重点介绍了利用ObjectARX编程的方法。该文以卸料螺钉为例介绍了程序的设计方法。该程序采用参数化编程，大大提高了设计效率。     

基于ObjectARX的玻璃瓶模具CAD系统的图形处理

介绍了参数化设计及参数化绘图的概念，详细介绍了基于ObjectARX的玻璃瓶模具CAD系统的图形处理过程，包括模具零件图纸的自动绘制及输出。     

复杂曲面船用螺旋桨铸造工艺三维参数化设计

以三维机械设计软件MDT为基础,基于MDT提供的API库函数和NURBS曲面造型方法,采用Visual Basic编程,开发出了螺旋桨及其铸造工艺的三维参数化设计软件系统,该系统可以迅捷地生成不同参数条件下螺旋桨的三维机械模型和铸造模型,显著提高螺旋桨及其铸造工艺的设计效率,并为螺旋桨的CAE、CAM提供基础的三维CAD模型。     

基于AutoCAD的液压集成块参数化装配环境

本文研究应用ObjectARX 2000开发工具，采用参数化CAD技术和基于约束的装配技术，创建了液压集成块的参数化实体模型和常用液压阀的三维元件库，构成了基于AutoCAD的液压集成块参数化装配环境，为开发适用于液压集成块的高度智能化的CAD应用软件提供了有力保障。     

基于MDT的液压阀块的参数化设计

介绍了液压阀块设计中应注意的几个问题。运用MDT软件进行了液压阀块的三维参数化设计,使形体转换为可视、可分析、可修改、可进一步模拟加工的实体模型,并通过实例说明了该设计的优点。     

组合夹具元件三维参数化图库的VBA开发方法

针对组合夹具元件标准化特点,以Access 为数据库平台,在MDT平台上以VBA为集成开发环境,开发了基于特征造型、参数化驱动的槽系、孔系组合夹具元件的三维参数化图库,介绍了图库的结构和用法,详细论述了VBA开发元件图库需要解决的OLE、数据库、三维图形生成等技术.     

用ObjectARX建立复杂零件模型的关键技术研究

ObjectARX是基于AutoCAD的面向对象的开发环境,ObjeectARX支持面向对象的特性改变了传统的CAD软件开发模式。详细介绍了AutoCAD面向对象的开发平台JbjectARX特性和功能的基础上,并通过一个机械设计实例,阐述使用ObjectARX进行三维实体复杂零件造型的设计方法和关键技术。     

空间凸轮的参数化设计及加工

提出一种空间凸轮的参数化设计方法,即采用VC 和ObjectARX作为开发工具,在AutoCAD环境下设计、绘制空间凸轮的轮廓曲线,然后导入MasterCAM中进行刀路设置和数控代码的生成。     

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.     

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。     

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.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

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.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.