汽车覆盖件模具型面设计方法的研究

覆盖件模具工艺设计过程中模具型面设计是能否设计出合格工序件的关键。本文研究了覆盖件模具型面的设计方法和设计原则，分析了现有设计方法的优点和不足，在此基础上，采用知识工翟方法应用于模具型面设计中，建立了基于知识的模具型面设计流程，提出基于模板的全参数化工艺补充面截面线设计方法，用承载了工程约束的截面线和控制线控制生成工艺补充面和压料面，实现了知识驱动的模具型面设计，提高了覆盖件模具工艺设计的自动化程度和智能化程度。     

基于PowerMILL的汽车覆盖件模具结构面智能化编程二次开发

通过分析汽车覆盖件模具结构面数控加工中存在的制约因素，探讨了基于Visual Basic.net语言对PowerMILL编程软件进行二次开发，结合企业加工工艺和模具结构特点，开发了模具结构面U型槽、凸台面、镶件安装面、背托、导板面、键槽和特征孔等智能化编程系统，可实现智能化设置各个刀具路径的加工刀具、加工余量、公差、转速、进给等切削参数，并自动命名程序名称、生成NC程序清单，简化了编程操作步骤。实践证明：编程系统的开发可以有效提高数控编程效率，减少人为因素造成的质量事故。     

用Mastercam9.1软件加工汽车覆盖件模具的工艺及编程

分析汽车覆盖件模具的特点,以汽车发动机内横梁左右安装支架模具制造为实例,介绍了用Mastercam 9.1软件对汽车覆盖件模具数控加工工艺的拟定,并说明了数控加工中参数的设置及编程.     

车身覆盖件快速模具及原型制作工艺研究

对车身覆盖件模具的传统制造和快速制模工艺进行了分析比较,介绍了热喷涂技术在模具制造中的应用。通过试验总结出快速模具制作中的原型制作工艺和模具制作工艺。针对石膏加工特性,进行了石膏原型的数控加工和后期的修补实验及热喷涂快速模具制造过程试验,得到了工程中车身覆盖件模具的制作工艺,将该方法应用到某车身覆盖件模具的制造中,取得了较好的效果,为新车型的开发提供了支撑和依据。     

汽车覆盖件模具成型面波纹的产生与消除

对汽车覆盖件模具数控加工后成型面产生的波纹缺陷进行分析,并结合生产实际提出了一种用于增加数控加工稳定性进而消除波纹缺陷的方法。通过此方法的应用,提高了模具数控加工后成型面的质量,对缩短模具生产周期有重要的意义。     

基于标准工艺模板的自动数控编程技术及其应用

分析了模具数控编程特点,针对数控加工工艺参数设置的重复性、差异性,提出建立一种标准的工艺模板,将数控加工的工艺流程和工艺参数进行模板化、标准化。建立包含工艺模板的知识规则库,通过规则推理结合几何图形自动识别技术,使一个新的加工零件能自动匹配到相应的模板,并设计每一加工工序的加工对象和操作参数,自动完成数控加工程序。通过实际应用,验证了本方法的有效性,特别对电极、镶件等加工工艺较为规范的零件,可提升数控编程效率60%以上。     

冲模首次研合率的影响因素及优化方法

<正>本文介绍了影响冷冲模具型面首次研和率的主要因素和优化方案,涉及模具结构设计的合理性、加工工艺、机床挠度补偿和模面不等间隙处理等诸多环节,能够给前期模具工艺结构优化设计提供一定的参考。目前,汽车外覆盖件的生产方式仍以冷冲压为主。汽车覆盖件的尺寸和表面质量很大程度上取决于冲模的型面研合率,如何提升模具型面研合率也成了模具制造和调试过程中的重要环节,模具的初次研合率直接体现了模具型面精度,并且决定后续研合工作量的大小。     

翼子板拉延模具型面优化设计及成形模拟

根据覆盖件拉延成形工艺补充面、压料面和拉延筋的设计原则和方法，设计出了翼子板拉延件。并运用有限元软件Dynaform对拉延成形过程进行分析，根据模拟结果对拉延型面进行修改、优化，最终得到合理的模具型面用于模具加工制造。     

模具高速加工编程模板的开发及应用

对注塑模具的工艺结构特征及其加工工艺进行研究,基于Cimatron E软件环境开发了模具高速铣数控加工编程模板,以提高NC编程质量和效率,规范工艺路线与工艺参数.并以模具型腔的数控编程为例验证了编程模板的可行性和实用性.     

基于知识的汽车覆盖件模具标准化数控编程

针对汽车覆盖件模具传统数控编程的缺陷，利用UG软件提供的自动化编程工具，提出了一套基于知识的汽车覆盖件模具标准化数控编程方案，提高了编程效率．而且保证了数控程序的可靠性，并举出了流程模板开发的实例。     

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.     

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.     

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。