塑料音箱下盖结构改进与注射模设计

介绍了塑料音箱下盖的成型工艺,通过对塑件结构进行改进,优化了塑件成型工艺。设计了双色塑料音箱下盖注射模,介绍了双色注射模的工作过程。经对塑件结构进行改进和采用合理的模具结构,生产的塑件合格率达到92%以上。     

热固性塑料精密注射模设计

针对采用普通热固性塑料注射模成型出的塑件所出现的工艺问题,设计了一副带有浮动型芯结构的热固性塑料精密注射模,有效克服了塑件表面凹陷、翘曲等缺陷,使塑件成型面达到较高的平面度。实践证明,塑件合格率得到了显著提高,取得了较好的经济效益。     

基于Moldex3D的电器壳体注射模设计

以塑料电器壳体为例论述了基于Moldex3D模流分析CAE的塑料注射模设计方法。针对该薄壳类塑件的塑料注射成型工艺进行了研究,包括电器壳体使用的ABS树脂材料性能分析,聚碳酸酯（PC）材料性能分析,塑件的注射成型工艺过程分析,针对该薄壳类塑件的例向分型注射模的设计与制造研究及相关技术图纸资料分析等。     

塑料镊子注射模设计

介绍了医用一次性塑料镊子的成型工艺及注射模结构 ,模具试模一次成功 ,成型塑件满足用户要求     

微小塑料铰链模内装配注射模设计

分析了采用模内装配技术注射成型微小塑料铰链的工艺特点及其所面临的难题,通过优化微小塑料铰链的结构,合理安排塑件的成型顺序以及塑件的浇口位置和分型面,提出了一种能够有效避免模具微细型芯在聚合物熔体高压作用下发生弯曲变形的成型方案。依据这一成型方案和实验室的设备条件,设计了一副能够在单料筒微注塑机上使用的模内装配技术注射成型微小塑料铰链的模具,不仅解决了微小塑料铰链的塑件之间难以产生运动间隙的问题,而且降低了对成型设备的要求。     

指环支架注射模设计

介绍了塑料指环支架的结构和成型工艺,设计了成型塑件的注射模,模具采用了推板推出及推杆二次推出机构,解决了塑件脱模难的问题。经大批量生产检验,模具结构合理,生产效率高,成型的塑件质量好。     

环状多网格风扇前盖注射模关键技术研究及校核

针对薄壁塑件风扇前盖的特殊设计要求,对塑料风扇前盖塑件进行了工艺分析,确定了塑料风扇前盖的分型面及成型方法。重点阐述塑料风扇叶前盖塑件注射模的主要部分,根据塑件大小等确定型腔数目及进行尺称校核,对相关工艺参数进行了校对,并对模具结构相关工艺参数进行了匹配校核,完成塑料风扇前盖板的注射模总体装备结构设计和相关主要塑件的设计,为类似塑件设计做铺垫。     

来复线自动脱螺纹注射模设计

分析了塑料端盖的结构特点,设计了1模4腔热流道注射模。模具采用来复线螺杆模内自动脱螺纹结构,利用双层推杆推出塑件。模具结构合理,动作可靠,塑件脱模顺利,生产的塑件精度高,完全达到设计要求。模具结构对同类螺纹结构塑件成型具有一定的参考价值。     

汽车进气歧管成型工艺分析及注射模设计

通过对汽车发动机核心塑件(一体成型塑料进气歧管)的结构工艺分析,确定模具整体成型和出模结构,通过模流分析,确定胶口位置及布局形式,介绍了一体成型塑料进气歧管注射模设计的关键点和模具制造过程中的注意要点。     

定模顶出在注射模中的应用

<正> 在塑料设计中,考虑塑件成型方式时,通常将收缩包紧力大的部分在动模型芯上成型,这样注射成型后塑件将留在动模,然后由机床和模具的顶出机构将其顶出脱模。但对于有些塑件根据其收缩情况无法确定是否能留在动模,或者塑件由于某些特殊原因其包紧力定模部分明显大于动模部分。为了解决这些问题,就必须设置一些机构使塑件在成型结束后留在动模以便顶出或从定模上直接脱模。     

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.