板料大变形程度内凹翻边工艺研究

针对计算大变形程度内凹翻边工件展开尺寸存在的问题，提出了复合翻边系数的假设，并给出了一种计算此类翻边工件工艺展开尺寸的新方法。     

用坐标变换计算“一面两孔”的定位误差

用坐变换的方法对工件一面两孔定位时的定位误差进行了合理地分析计算，给出了定位误差对工序尺寸的函数关系式。     

内法兰环件辗扩成形尺寸控制方法

尺寸控制是辗扩工艺应用于生产实际所必须解决的一个关键问题。对内法兰环件辗扩过程中的尺寸变化规律进行了研究，指出了现有辗扩设备中尺寸控制方法的不完善之处，建立了内法兰环件精辗位置在线预测的计算公式，给出了径向辗扩成形工件尺寸的控制方法。     

最优对刀尺寸的计算方法

在大批量加工工件时，往往是通过“对刀”来调定刀具的切削位置，对刀块的尺寸是事先要确定的对刀尺寸，文章提出的最优对刀尺寸计算方法，其主要特点是：在确定对刀尺寸公差带分布时，考虑了刀具磨损对工件加工工序尺寸的影响，并且针对所加工的工序尺寸是包容尺寸还是被包容尺寸而采取不同的对刀尺寸公差带分布。这样，就能充分利用刀具的寿命，减少对刀次数，并可使加工出来的一批工件实际尺寸分布中心与所要求的工序尺寸公差带中心相一致．     

双资源作业车间双目标调度优化研究

考虑在制品库存费用、机床工时费、直接工人的工资费用、工件的提前和拖期完工造成的损失费用,提出了一种双资源作业车间调度的生产费用计算方法.将一种新的排序策略嵌入到Pareto竞争方法中,设计了一种新的混合遗传算法,对生产周期和生产费用两个目标同时进行优化.为了保证解的多样性,采用小生境技术并同时使用多种交叉方法.用Pareto解集过滤器保存进化过程中的最优个体并不断更新,防止最优解的遗失.算法最后给出问题的Pareto最优解集.仿真结果表明:该方法是可行的,并具有一定的优越性.     

遗传算法解决车间作业调度问题的优化研究

遗传算法由于其隐合并行性和全局解空间搜索两大优点而成为解决JobShop问题的常用工具。但是由于JobShop问题本身的特点，普通遗传算法难以在解此类问题时获得满意解，最突出的问题就是过早收敛于某一局部最优解，使算法效率降低。文章从实用角度出发，通过优化种群、降低选择压力和将模拟退火算子加入到算法中对遗传算法进行了优化，以使其适应于JobShop问题的特殊情况，并以Matlah为工具讲行了仿真实验．获得了较好效果。     

求解车间调度问题的一种改进遗传算法

为了克服传统遗传算法解决车间作业调度问题的局限性,提出了一种改进的遗传算法,引入人工免疫机制克隆选择算子和设计独特的交叉算子,提高了算法的收敛速度和种群的多样性,可以有效地避免基本遗传算法种群早熟化和收敛速度慢的问题.仿真结果表明,与基于工件交叉位置的遗传算法比较,改进的遗传算法在全局最优解和收敛速度上都有较为明显的优势.     

基于改进遗传算法的圆锥滚子轴承优化设计方法的研究

文章给出了基于改进遗传算法的圆锥滚子轴承优化设计的方法。针对传统算法在圆锥滚子轴承优化设计中全局寻优能力较差问题，文章改进了标准遗传算法（Simple Genetic Algorithm SGA）的算法参数，采用了最优解保存策略，并运用退火罚函数法处理约束。通过与标准遗传算法及综合约束双下降法比较，表明改进遗传算法具有良好全局寻优能力和稳定性。从而解决了开发圆锥滚子轴承CAD系统的关键问题。     

生产线同步传递信息的跟踪与提取

构建出一种物料在线分组控制系统,提出了物料队列分组信息与运动位置相互配准方法,给出了分组控制的关键程序.采集实例工件尺寸信息,对工件进行尺寸分组;按照FXPLC的通信协议,采用VB编程,把分组信息传递给PLC;对PLC的数据存储单元移位及移值标记的提取,实现对运动工件分组信息跟踪和分组控制.运行实验结果表明,工件被准确分组.     

基于动力学性能的粘片机2PRR焊头机构尺度优化

IC粘片机的2PRR焊头机构为高速高精度运动部件,仅以尺寸和运动学指标对其进行优化设计难以达到性能最优的效果,故提出了基于动力学性能指标最优的尺度优化方法及其求解算法(双重遗传算法)。首先,建立2PRR并联机构的动力学方程并确定其关键尺寸和工作空间基准点坐标作为优化变量;然后,以工作空间范围内动力学性能最优为目标建立优化模型,并列出了约束条件;最后,通过双重遗传算法求得优化结果。算法结果收敛表明该方法有效。该方法对高速高精度机构的优化设计具有参考价值。     

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.     

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。     

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.