基于TCP的气动手爪MCD模型虚拟调试的研究

利用NX软件的建模模块建立一种工业机器人的双气动手爪三维模型;在其机电概念设计模块(MCD)中进行气动手爪模型的机械设计、电气设计以及自动化设计;在完成MCD模块内部信号自动化序列仿真的基础上,基于一种开放式用户通信协议TCP,实现虚拟PLC控制气动手爪模型动态仿真的虚拟仿真调试。研究结果在机电一体化概念设计以及动态虚拟仿真调试方面,为相关技术人员提供了参考。     

基于MCD平台的数控车床上下料机械手机电一体化概念设计与控制仿真

结合Teamcenter,在MCD平台上完成数控车床上下料机械手机电一体化概念设计与控制仿真,主要包括:需求分析、机械设计、自动化设计,并基于NX MCD平台,根据自动上下料机械手的的需求分析,完成功能的分解、机构的设计和重用、功能属性的定义,以及仿真序列的设定及PLC程序的生成,完成了自动上下料机械手的虚拟仿真的工作。实际应用体现了NX MCD平台具有多系统集成性高、概念建模及模拟仿真、可实现知识的重用等优势,打破了现有的机电一体化产品概念设计的模式,对企业设计方式的改革、加快企业的研发速度、增强部门之间的协同具有一定实际指导的意义。     

热处理对建筑高强度耐火钢力学性能的影响

采用Mo、Nb、V合金化方法设计了4种高强度耐火钢,对热轧态钢筋力学性能进行了研究,并对钢筋进行了正火处理,分析了热处理工艺、合金元素等对耐火钢筋性能的影响。得出的结论为:热轧态Mo+Nb、Mo+V,Mo+Nb+V钢筋屈强比超过0.8,不能达到建筑用钢的基本要求。经过820℃正火处理后的Mo+Nb、Mo+V钢筋和860℃正火处理后的Mo+Nb+V钢筋屈强比是在0.8以下,塑性提高较大。同时,在钢筋耐火性能方面,Mo+Nb合金化效果优于Mo+V合金化效果。     

基于NX MCD的工业机器人视觉分拣数字孪生系统设计

针对制造业中多类型、多颜色工件人工重复分拣出错率高的问题，设计一个基于工业视觉的工业机器人自动分拣物理控制系统和数字孪生系统。提出融合工业视觉、工业机器人、PLC等设备的以太网通信控制方案；基于视觉检测原理，应用视觉检测工具，结合PLC程序能够正确识别工件信息；基于NX MCD软件构建了工业机器人、输送带、工件等数字孪生系统；最后，对工业机器人和PLC进行联合编程，实现视觉分拣虚实系统同步作业。实验结果证明：该系统工件识别正确率高，工件分拣效率高，数字孪生系统能够实现虚实同步，为系统的动态监控、维护管理与虚拟调试提供了便利。     

基于NX/PTS的可重用模型库的构建

文章以UG/NX7.5为平台,研究了利用NX的PTS可重用模块来完成可重用模型库的构建.结合工装夹具可重用库的创建实例,介绍了利用NX/PTS构建可重用库的方法和流程,最后对所构建的夹具模型库进行了调试.结果表明,利用NX/PTS使得大量的变形设计和自适应设计可以重用以前的设计知识,提高了机械设计的设计效率和精度.     

基于NX7.0的一种自动化冲压生产线板料分离机构的设计

基于NX7.0这一CAD/CAE一体化软件,设计出一个综合机械分离、微变形分离、吹气分离三种方法的拆垛分料机构。应用NX7.0虚拟建模和高级仿真模块对设计意图进行有限元分析,进而优化改进设计。通过现场样机加工装配试运行,验证了设计的可行性。     

基于数字孪生的物流拣选虚拟调试系统设计

为降低调试周期和成本，提前预知系统级风险，基于数字孪生的虚实一致特性，提出一种基于数字孪生的固定轨物流拣选虚拟调试系统设计方法。根据固定轨物流拣选系统的特性和调试需求，建立虚拟物理模型、虚拟执行系统和虚拟控制系统，同时对控制器-虚拟模型接口进行设计，实现虚实之间的通信。通过物流拣选系统实例，验证了基于此数字孪生模型进行虚拟调试的有效性与实用性，基于数字孪生的固定轨物流拣选虚拟调试系统能够降低物流拣选系统的调试周期和成本，进而提高调试效率。     

基于UG的压装机虚拟设计

基于UG NX8.0的平台,完成了缸体缸套压装机的虚拟样机设计工作,详细介绍了压头定位机构和顶升机构的机械结构。此虚拟样机为后续的仿真分析和制造工作提供了良好的基础,并以此说明了UG在虚拟设计中的应用情况。     

虚拟仿真技术在多轴机床后处理定制中的应用

对FIDIA五轴立式加工中心后处理的定制过程进行研究,并利用虚拟仿真技术对后处理的正确性进行验证。通过NX软件的后处理构造器定制了适用于FIDIA C1系统的后处理。为了验证后处理的正确性,在NX中建立简化的机床几何模型,将机床各部件以STL格式文件导出至VERICUT软件中,在VERICUT中进行相应的配置,完成虚拟仿真环境的构建;以鼠标模型作为加工对象,在NX加工模块中创建刀具轨迹,通过定制好的后处理将刀轨源文件转换为机床能够识别的NC代码,在虚拟仿真环境中进行模拟加工,验证无误后传输至机床进行零件的实际加工。结果表明:虚拟仿真技术可以有效避免由于后处理定制不当而导致的机床碰撞,确保机床安全、高效地运行。     

基于数字样机的刷钩台虚拟调试与性能验证北大核心

为有效提高自动化生产线研发和调试的效率,以电机换向器生产线刷钩台为应用案例,提出了一种基于数字样机技术的自动化生产线虚拟调试调试和性能验证方法。在Process Simulate中进行刷钩台模型智能组件的逻辑化处理,在TIA Portal中开发PLC程序和系统可视化界面实现对刷钩台模型的控制。通过实验提取主要驱动部件运行特性,对相应动作的PLC控制程序段进行修改。在虚拟调试中,刷钩台数字样机模型在PLC程序的驱动下有序执行动作并实现设计功能,数字样机的设计PLC时序和实际PLC时序在合适的范围内,验证了基于数字样机的自动化生产线虚拟调试与性能验证方法的有效性。     

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.