高速加工中心自动换刀装置的研究

针对我国目前弧面分度凸轮自动换刀装置设计制造水平不足的现状,设计一套结构简单、加工方便的自动换刀完成自动换刀,并详述了换刀的实现过程。新的自动换刀装置精度高、运行平稳、价格合理,能够取代弧面分度凸轮机构。     

弧面凸轮专用数控机床的研究与开发

简要分析了弧面凸轮机构的发展与特点、弧面凸轮加工专用数控铣床的现状以及缺陷,提出了重新开发和研制新一代加工弧面凸轮的专用数控铣床的必要性.完成了新型的五轴联动的弧面凸轮加工专用数控铣床的方案设计与结构设计,并应用Pro/ENGINEER野火版软件对主要零部件进行了三维实体造型、总装配、运动仿真和干涉检查.     

基于Pro/E的弧面凸轮分度机构建模研究

阐述了利用Pro/E软件实现零件三维造型的方法,同时完成了弧面凸轮分度机构数字样机的构建.运用Pro/E提高了设计效率,缩短了产品开发周期.     

基于Pro/E和ADAMS的圆柱分度机构参数化建模及仿真

利用空间包络曲面的共轭原理建立了圆柱分度凸轮的数学模型,使用 Pro ／E 三维软件的参数化建模功能对特定的圆柱分度凸轮进行设计和精确建模,建立了圆柱分度凸轮机构虚拟样机模型,使用 ADAMS 软件对其进行动力学和运动学仿真分析。仿真结果表明：该机构模型建立的正确性,得到了具有实际应用价值的结论,对圆柱分度凸轮机构的设计、加工、安装起到了一定的指导作用。     

数控加工中心ATC弧面分度凸轮运动学问题研究

推导了弧面凸轮压力角和诱导主曲率的计算公式，对数控加工中心凸轮式自动换刀机械手(ATC)弧面分度凸轮的压力角和曲率进行了详细的分析，为ATC的优化设计和研究提供了理论基础，有助于ATC机构产品系列化的完成。     

弧面分度凸轮工作轮廓曲面的三维网格模型设计

针对孤面分度凸轮几何参数和运动参数繁多以及滚子类型和运动规律曲线多样的特点,描述了弧面分度凸轮工作轮廓曲面的生成方法及其方程,并在此基础上,利用MATLAB编程语言,开发出具有统一用户界面的弧面分度凸轮工作轮廓曲面三维网格设计程序,缩短了设计周期,提高了设计精度.     

钢球滚子弧面分度凸轮机构的三维建模及运动仿真

介绍钢球滚子弧面分度凸轮机构三维模型的建立和运动仿真过程.根据包络蜗杆分度机构啮合原理得到弧面凸轮廓面方程,并求得钢球滚子中心轨迹点.实现钢球滚子弧面分度凸轮机构组件三维几何模型的建立和装配,并对钢球滚子弧面分度凸轮机构进行运动仿真.分别用简谐运动曲线和修正正弦曲线进行对比验证,结果表明:建立的三维模型是正确的和可行的,修正正弦曲线能够使弧面分度凸轮的运动更加平稳.     

基于OpenGL的空间分度凸轮机构的运动仿真

论述了在windows环境下，通过VC＋＋6.0调用OpenGL图形库中的函数，开发能实时处理具有真实感的空间分度凸轮机构的运动仿真系统。该系统完成了空间分离凸轮机构参数化设计的可视化工作，并通过三维图形仿真的方式验证机构设计方案的合理性和各构件在运动过程中是否发生干涉，机构参数设计是否最优。因此该系统有助于及时发现、解决设计中存在的问题。     

弧面分度凸轮三维实体模型的建立

文章给出了弧面分度凸轮工作轮廓面上点坐标的通用计算公式,在此基础上阐述利用UG/Freeform Modeling模块与C 语言相结合生成弧面分度凸轮的工作曲面,以实现弧面分度凸轮的三维实体建模.为弧面分度凸轮机构的研究与开发及其动力学仿真奠定了基础.     

弧面分度凸轮机构分析及其虚拟样机技术的发展

评述了弧面凸轮机构的现状及目前设计中存在的问题,提出了弧面凸轮机构分析的基本方法,介绍了弧面凸轮机构在自动换刀装置中的应用.并指出虚拟样机技术在弧面凸轮机构设计和研究中的应用及其发展趋势.     

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.     

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.     

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.     

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。     

A STUDY OF TEMPERATURE-DEPENDENT VALENCE BOND STRUCTURE OF TITANIUM

On the basis of energy and shape method for the determination of the valence bond (VB) structures of crystal, the valence bond structure of titanium is redetermined at room temperature and calculated in the whole temperature range of 0-1943K. The outer shell electronic distribution of Ti is e_c~(2.9907) · (s_c~(0.4980) d_c~(2.4927)) ef1.0093 in crystal. The temperature dependences of the VB structures of hcp and bcc phases are the same. The VB structures of hcp and bcc phases monotonically increase or decrease with the increase in temperature, but show discontinuous changes at the phase-transformation temperature 1155K.