采用激光焊的行李箱外板上段冲压工艺研究

行李箱外板上段与下段采用激光焊结构,对成形制件搭接边的表面质量及尺寸精度要求较高,由于翻边深度较深,翻边时产生坑包波浪且回弹严重,针对翻边后回弹及表面质量缺陷等问题,从制件结构及工艺设计两方面进行优化,提高成形制件尺寸精度及面品质量,缩短模具调试、整改周期,降低整车制造成本,提高市场竞争力。     

斜楔机构在汽车侧围外板翻边模中的应用

根据汽车侧围外板不同位置的翻边特点采用不同的斜楔机构成形,为解决侧翻边存在负角成形和取件问题,提出了3种新型斜楔机构,并介绍了侧围外板的冲压成形工艺和3种斜楔机构在侧围外板翻边模中的实际应用,可提高零件成形质量,降低模具开发成本。     

旋转斜楔机构在汽车侧围外板翻边模中的应用

分析了汽车侧围外板的冲压成形工艺,提出了一种新的斜楔机构———旋转斜楔机构。将双向运动斜楔与旋转斜楔进行了对比,在侧围板外覆盖件翻边模具中采用旋转斜楔成形机构,大大提高了生产效率。     

轿车侧围外板冲压成形工艺优化

通过分析轿车侧围外板结构特点及成形工艺过程,采用特殊的复合结构模具,通过修边与整形复合、直翻边整形与斜楔翻边复合及直翻边与斜楔冲孔复合,使轿车侧围外板冲压工序由5道减少至4道。经生产证明:优化后的冲压工艺可行,模具数量减少,缩短了模具生产周期,提高了生产效率,降低了制造成本,为类似冲压件的工艺设计提供了有益借鉴。     

汽车侧围外板侧翻边双驱动滑车斜楔机构设计

通过对汽车侧围外板结构及成形工艺进行分析,设计了一种双插刀滑车斜楔机构实现汽车侧围外板成形,该机构先后驱动不同方向的滑车,实现了零件负角翻边,并在零件完成冲压后从Z向垂直取件,解决了侧围外板成形过程中起皱与缺料现象,提高了零件成形质量,对同类零件的模具设计具有一定的参考作用。     

基于短工序化的侧围外板冲压工艺与模具设计

为了减少侧围外板冲压模具工序数量,降低新车型冲压模具投资,以某SUV车型侧围外板为例,通过对产品成形性和模具结构可实现性进行分析,设计了满足短工序化的冲压工艺方案。引入多种复合模具结构和特殊斜楔,实现了侧修边与侧冲孔、侧翻边与侧冲孔、侧整形与侧翻边等不同工艺内容的同序化,从而将侧围外板冲压模具工序数量由4道工序缩短至3道工序,并完成工业化应用。实践证明,短工序化工艺方案可有效削减模具工序数量,提高生产效率,降低模具开发及后期生产成本,满足侧围外板的批量生产需求,对于汽车行业冲压模具的工序优化具有一定借鉴意义。     

汽车前柱加强板冲压工艺及模具设计

以某汽车左前柱下部加强板为研究对象,根据其结构特征,设计了落料→拉伸成形→修边冲孔侧修边→翻边整形→冲孔侧冲孔修边5道工序成形,并运用Autoform有限元分析软件进行冲压成形数值模拟。依据工艺设计内容,运用UG、CATIA和AutoCAD软件,设计出了左前柱下部加强板冲压成形的5副模具。通过预压成形,制件符合各项技术指标。     

汽车行李箱盖外板回弹控制的工艺研究

针对汽车行李箱盖外板在冲压成形过程中容易出现回弹的问题,以某车型行李箱盖外板为例,通过优化制件的翻边工艺,有效地控制了制件回弹,同时,采用Autoform软件对优化前后的制件回弹进行模拟分析对比,结果表明,翻边工艺的改进可以有效改善回弹,避免了A面补偿带来的表面质量缺陷,可为车门外板或发动机罩外板的外覆盖件的冲压成形提供参考。     

翼子板翻边整形复合斜楔结构设计

介绍了成形某车型翼子板第3道工序中的翻边整形复合斜楔结构,该斜楔将向下整形和侧向翻边整合在一起,减少了模具数量,节约了制造成本。模具已投产,动作顺畅,成形的零件品质好,达到了预期效果,具有一定的推广价值。     

行李箱隔板成形工艺分析与翻边整形模设计

以汽车行李箱隔板为例,介绍了零件成形工艺、模具工作过程、双活翻边整形模结构设计要点以及模具设计注意事项,经过生产批量验证,零件生产工艺及模具结构设计合理,生产稳定,降低了模具制造成本,成形后零件尺寸精度满足客户要求。     

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.