基于LabVIEW的焊接参数管理系统

分析了当前国内焊接车间工艺及质量管理与控制方面普遍存在的问题,基于Lab VIEW平台与Oracle数据库设计了一套焊接车间焊接过程参数管理系统软件。通过嵌入式采集板实现焊接参数的采集,并经Zig Bee无线网络将采集信息发送至上位机,由Lab VIEW编制的上位机软件完成数据处理,实现对焊接车间各个工位工艺参数的实时监控、焊工与焊机管理、焊接过程参数管理等功能,具体包括:报表输出、波形显示、工艺超标报警、焊工与焊机管理以及焊接接头数据存储、查询、分析等功能;结合Lab VIEW的界面发布功能,通过企业以太网实现监控界面信息共享。该系统具有友好的人机交互界面,可方便地实现界面切换和各项操作,提高了焊接车间工艺管理的效率,实现了焊接产品的质量追溯,促进了焊接生产管理的智能化与高效化。     

基于NI-cRIO的网络化发动机测控系统开发

针对目前发动机试验台存在软硬件不兼容、测控分离且功能单一难以拓展的问题,介绍了一种基于NI-cRIO实现测控一体化及网络化的测控系统设计方案,详细给出了系统的总体架构和硬件选型,基于Lab VIEW开发了一套具备数据采集、数据处理、数据保存、数据查询、报表生成、手/自动控制和状态报警等功能的模块化测控系统软件,并对测控系统软件功能界面及程序架构进行了详细介绍,经应用验证符合系统测控一体化及网络化的设计目标。     

基于LabVIEW的双液压缸同步控制系统的开发

针对液压缸同步要求,构建了基于Lab VIEW的实时采集控制系统。该系统利用采集卡实现了对主、从液压缸位移的实时检测,通过增量式PID结合控制卡实现了对从液压缸位移的闭环控制,从而保证了从液压缸对主液压缸的实时跟踪,达到同步控制的目的。测试结果表明:该控制系统能够很好地控制主、从液压缸的位移,同步精度高,完全符合实际使用需求。     

基于LabVIEW的多路阀阀体疲劳测控系统

基于Lab VIEW开发了一套用于多路阀阀体的疲劳测控系统,并对液压系统进行了相关的设计和计算。该系统可以按照设定的参数自动调整疲劳试验的压力、压力上升和压力下降的速度、保压时间等参数,调节这些参数可以模拟多种形式的疲劳试验工况,并可根据压力参数进行相关安全保护以及试验次数的计算。     

基于LabVIEW的现场数控专机监测系统设计

设计一套基于Lab VIEW的现场数控专机监测系统,详细介绍了系统的总体设计、硬件构成和软件功能模块开发中的关键技术。该系统以安装Lab VIEW平台的工控机为上位机,以控制机床加工的HNC-808M数控装置和采集机位数据的PLC组件为下位机。实验验证:该系统运行稳定,能够实现专机安装调试和加工过程的数据通信和实时监测。     

伪微分反馈控制在变频闭式系统中的应用

设计一种基于变频调速的液压闭式回路,通过PLC控制变频器达到控制整个液压系统的目的。对闭式回路分别采用传统PID控制算法与PDF控制算法,建立Lab VIEW界面观测系统的响应特性。实验结果证明:引入伪微分反馈控制算法能改善执行机构的响应特性,鲁棒性更强。     

基于LabVIEW的多路阀阀体疲劳试验测控系统

基于Lab VIEW开发了一套用于多路阀阀体的疲劳测控系统,并对液压系统进行了相关的设计和计算。该系统可以按照设定的参数自动调整疲劳试验的压力、压力上升和压力下降的速度、保压时间等参数,调节这些参数可以模拟多种形式的疲劳试验工况,并可根据压力参数进行相关安全保护以及试验次数的计算。     

高速电主轴数据采集系统设计

为了分析高速电主轴的动态和热态特性,设计了一套基于Lab VIEW的高速电主轴振动和温度数据采集系统。该系统主要由压电式加速度传感器、一体化温度传感器、数据采集卡、变频器和计算机组成,使用Lab VIEW2009虚拟仪器开发平台,实现了高速电主轴运行中振动和温度信号的实时采集处理、波形显示以及信号存储。     

电液伺服系统自适应模糊PID的设计与仿真

针对电液伺服系统存在非线性、参数时变等问题,设计了一种具有在线实时调节PID参数的自适应模糊PID智能方法,以实现对被控对象的位置追踪和准确定位。首先利用AMESim建立控制系统仿真模型,然后基于Lab VIEW设计自适应模糊PID控制器,对系统进行联合仿真,最后基于PCI-6221为硬件核心,结合DAQ技术对控制系统进行实验分析。仿真和实验结果表明,该方法比传统的PID控制方法具有更好的鲁棒性和自适应性,明显提高了系统的稳态精度和动态响应速度。     

基于LabVIEW工业机器人自动分拣系统设计

自动分拣系统是大多数流水生产线上的一个重要环节。基于机器视觉的机器人分拣则有着适应范围广、随时变换作业对象和变换分拣工序的优势。设计基于Lab VIEW软件控制的工业机器人自动分拣系统,采用Lab VIEW软件编程、设计原型。测试和实验证明,系统能够稳定地实现物料的迅速识别和自动分拣。     

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。     

Rheology Feature of Simple Metal Melt

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.     

Microstructures and Mechanical Properties of a Newly Developed Austenitic Heat Resistant Steel

The effect of heat treatment on the microstructures and mechanical properties of a newly developed austenitic heat resistant steel(named as T8 alloy) for ultra-supercritical applications have been studied. Results show that the main phases in the alloy after solution treatment are γ and primary MX. Subsequent aging treatment causes the precipitation of M_(23)C_6 carbides along the grain boundaries and a small number of nanoscale MX inside the grains. In addition, with increasing the aging temperature and time, the morphology of M_(23)C_6 carbides changes from semi-continuous chain to continuous network.Compared with a commercial HR3C alloy, T8 alloy has comparable tensile strength, but higher stress rupture strength. The dominant cracking mechanism of the alloy during tensile test at room temperature is transgranular, while at high temperature, intergranular cracking becomes the main cracking mode, which may be caused by the precipitation of continuous M_(23)C_6 carbides along the grain boundaries. Typical intergranular cracking is the dominant cracking mode of the alloy at all stress rupture tests.     

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.     

The 15th Global Foundry Sourcing Conference 2014held in Qingdao China

Organized by Suppliers China Co., Ltd and co-organized by the National Technical Committee 54 on Foundry of Standardization Administration of China, the 15th Global Foundry Sourcing Conference 2014 （hereinafter referred to as FSC 2014） was successfully held on Sep. 23rd in Grand Regency Hotel, Qingdao. More than 500 delegates from home and abroad attended this conference, including over 130 purchasers from 20 countries and 380 domestic and foreign suppliers.     

Secondary Recrystallization Behaviors of Grain-Oriented 6.5 wt% Silicon Steel Sheets Produced by Rolling and Nitriding Processes

By rolling and nitriding processes, 0.23- to 0.3-mm-thick grain-oriented 6.5 wt% silicon steel sheets were produced. The core losses of grain-oriented 6.5 wt% silicon steel at frequencies ranging from 400 Hz to 20 k Hz were lower than that of the grain-oriented 3 wt% silicon steel with the same thickness by 16.6–35.8%. The secondary recrystallization behavior was investigated by scanning electron microscopy, energy-dispersive spectroscopy, and electron backscattered diffraction. The results show that the secondary recrystallization in high-silicon steel sheets develops more completely as the nitrogen content increases after nitriding, secondary recrystallized grain sizes become larger, and the sharpness of Goss texture increases. Because more {110}116 grains in the subsurface and the central layer of the sheets have a lot of 20°–45° high-energy boundaries in addition to Goss grains, {110}116 can be the main component through selective growth during secondary recrystallization when the inhibitor quantity is not enough and inhibitor intensity is weaker. The increases in nitrogen content can increase the inhibitor intensity and hinder abnormal growth of a mount of {110}116 grains and therefore enhance the sharpness of Goss texture.     

Laser Cladded TiCN Coatings on the Surface of Titanium

Laser cladded coatings of TiCN were produced on the surface of titanium. To obtain the optimal techniques, several conditions were tested by varying the laser scanning rate. The choice of shielding gas was also studied. The cladded coatings were then evaluated from the surface mechanics point of view based on their microhardness. The microstructure of some interesting samples was investigated by optical micrographs (OM). The results showed that under the condition of fixed pulse frequency and pulse width, the laser scanning rate and the shielding gas are the main factors influencing the components of coatings. TiCN coatings were decompounded and oxidized during the cladding process in the condition of no shielding gas of N2. X-ray diffraction results indicated that the composite coatings composed of TiCN, TiC, Ti2N, and TiO2 were produced using appropriate techniques. The results indicated that the best condition in terms of the surface microhardness is obtained when the scanning rate is 1.5mm / s, the pulse frequency is 15Hz, the pulse width is 3.0ms, and N2 is chosen as the shielding gas. The microhardness of the composite coatings is about 1331kg · mm - 2, which is about 4 times that of the substrate. The optical micrographs indicated that the cladding zone is made up of TiCN, TiO2, and some interdendritic Ti, but the diffusion zone mainly consists of the dendrites phase, and the cladded depth is about 80?滋m, which is more than 2 times that of the laser nitrided sample. There were no microcracks or air bubbles in the cladded sample, which was cladded using the above optimal techniques.     

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