基于CAD/CAE技术的塑料盖注射模设计简

运用MoldFlow软件,对塑料盖的注塑成型过程进行了模拟分析,确定了模具的浇注系统。在此基础上,运用Pr0／E软件完成了模具的三维分模,并将设计好的成型零件导入模架设计专家系统EMX,进行塑料盖三板式注塑模具设计。基于CAD／CAE技术的注塑模具设计方法,在一定程度上提高了模具设计效率,降低了模具制造成本并缩短了生产周期。     

Pro/E二次开发技术在三维锻模CAD中的应用

本文介绍了Pro／ENGINEER的二次开发技术,重点阐述了使用Pro／Foolkit在三维锻模CAD中的开发方法,并在此基础上,具体对锻模CAD系统开发中的锻件图自动生成、飞边槽自动设计、非几何特征的处理以及锻模型腔自动生成等关键技术给出了实现方案和示例,为三维型腔模具的CAD开发提供了一个较好的方法。     

铝型材挤压模CAD/CAE/CAM研究进展

综述了铝型材挤压模ＣＡＤ／ＣＡＭ系统的发展历史和研究现状,介绍了铝型材挤压模ＣＡＥ的概念,指出了铝型材模ＣＡＤ／ＣＡＥ／ＣＡＭ系统的发展方向．     

基于Pro/E的锻模设计与制造

随着经济的全球化，传统制造业的竞争越来越激烈，产品的更新越来越快．对模具要求也相应提高。本文介绍了基于Pro／E的锻模的三维设计和加工方法，并以实例对各部分的设计过程分别进行了简要介绍，希望对各位读者有借鉴和参考作用。     

基于B/S模式的钣金展开/切割CAD/CAM系统研发

建立了基于B／S模式的钣金展开CAD／CAM系统。论述了基于ASP理念钣金展开／切割CAD／CAM系统的计算模型和编程原理、用户身份认证机制、零件信息输入与处理，NC指令生成及浏览器端的动态加工模拟、系统管理机制等关键技术及实现方法。     

Pro/MoldDesign在模具零件设计中的应用

介绍了利用Pro／MoldDesign进行模具设计的基本流程,并以手机外壳零件为例,利用现有的三维零件模型创建参照零件和工件、模型的检验（拔模和厚度检验等）、分形线／面的创建,模具体积块的创建及模拟打开过程,对建模过程中的软件操作进行了简要的分析,实现了Pro／E软件在复杂型面模具设计与制造中的应用。为利用现有实体模型设计生成模具提供了一种切实可行的模具设计方案。     

基于网络的CAD/CAE/CAM/ERP在挤出模设计及制造中的应用

通过构建基于网络技术的综合信息平台、基于ERP和基于并行工程的CAD／CAE／CAM系统的智能化局域网络系统，分析CAD／CAE／CAM，ERP在挤出模设计及制造中的应用。     

基于Pro/E的叶轮三维造型及模具设计

Pro／E软件具有强大的三维造型功能，特别适合于复杂曲面。利用Pro／E软件的零件设计模块功能中的旋转特征，扫描混成特征，阵列特征，切割挤出特征，切割旋转特征，倒角特征设计出了导轮三维造型图，并且完成了叶轮压铸模的结构设计。     

基于Pro/E二次开发的谐波传动CAD/CAM辅助系统的开发与研究

阐述了基于Pro／E二次开发的谐波传动CAD／CAM系统的开发方法。在Visual C＋＋环境下利用C语言程序接口，实现了谐波传动的参数化CAD／CAM系统的集成。实践证明，该系统开发结果正确，具有一定的工程价值。     

虚拟模具CAD/CAE/CAM系统结构框架及其环境技术

分析了模具行业存在的问题和现实性要求,提出了一种虚拟模具ＣＡＤ／ＣＡＥ／ＣＡＭ系统思想－ＶＣ３,创造性地构造了其系统框架结构,并对其环境技术进行了详细地研究,给出了虚拟公司数据仓库的数据层次关系图。虚拟模具ＣＡＤ／ＣＡＥ／ＣＡＭ系统的思想是敏捷制造技术、并行工程、专家系统、网络技术及先进的管理技术的综合体现。该系统的核心在手集成,实现方式采用虚拟手段,具体体现为生产系统的控制与技术管理、生产经营一     

Subsolidus phase relations in the ZnO–MoO3–B2O3, ZnO–MoO3–WO3 and ZnO–WO3–B2O3 ternary systems

The subsolidus phase relations in the ZnO–MoO₃–B₂O₃, ZnO–MoO₃–WO₃ and ZnO–WO₃–B₂O₃ ternary systems have been investigated by the means of X-ray powder diffraction (XRD). There is no ternary compound in all the systems. There are five binary compounds and five tie lines in the ZnO–MoO₃–B₂O₃ system. This system can be divided into six 3-phase regions. There are three binary compounds and three tie lines in the ZnO–MoO₃–WO₃ system. This system can be divided into four 3-phase regions. There are four binary compounds and four tie lines in the ZnO–WO₃–B₂O₃ system. This system can be divided into five 3-phase regions. The possible component regions for ZnO single crystal flux growth were discussed. The phase diagram of Zn₃B₂O₆–ZnWO₄ pseudo-binary system has been constructed, and the result reveals this system is eutectic system. The eutectic temperature is 1007 °C and eutectic point component is 70 mol% Zn₃B₂O₆.     

HCO3-和SO42-对Cu点蚀行为的影响

在不同浓度配比的HCO₃^-和SO₄^2-混合溶液中,利用循环极化电化学测试方法和SEM,对Cu工作电极的循环极化行为和点蚀表面形貌进行了系统的研究.结果表明,在高电位范围的循环极化实验中,Cu的点蚀行为可分为活性溶解型点蚀和钝化膜破裂型点蚀;随SO₄^2-浓度的升高Cu点蚀的敏感性增大.由于HCO₃^-与SO₄^2-的协同作用,随HCO₂^-浓度升高点蚀敏感性呈先增大后减小的规律.在钝化膜破裂型点蚀中,SO₄^2-提高Cu点蚀的诱发能力;HCO₃^-降低Cu点蚀的诱发能力.2种离子对点蚀自修复能力的影响无明显规律.     

Roles of lithium ions and La/Li-site vacancies in sinterability and total ionic conduction properties of polycrystalline Li3xLa2/3−xTiO3 solid electrolytes (0.21 ≤ 3x ≤ 0.50)

The Li_0.33La_0.55TiO₃ solid electrolyte has a maximum grain ionic conductivity of 1.13 × 10⁻³ S cm⁻¹ among the Li_3xLa_2/3−xTiO₃ oxides (0.21 ≤ 3x ≤ 0.50), but the total ionic conductivity of its polycrystalline phase is not the highest. Owing to the grain-boundary resistances controlling the total resistances of bulk samples, an excellent solid electrolyte is mainly characterized by the grain-boundary resistances. With regard to the role of lithium ions, the substitution of La³⁺ ions by the Li⁺ ions weakens the strength of inter-ionic forces, leading to the decrease in the sintering temperature. The presence of La³⁺/Li⁺-site vacancies promotes the densification and grain growth and further results in rapid decreases in porosity and grain-boundary resistances. Li_0.21La_0.60TiO₃ with a larger amount of La³⁺/Li⁺-site vacancies can therefore exhibit the highest total ionic conductivity through rapidly decreasing its grain-boundary resistances by changing its microstructure, and it becomes a better polycrystalline solid electrolyte than Li_0.33La_0.55TiO₃ in the Li_3xLa_2/3−xTiO₃ system studied, in spite of its lower grain ionic conductivity.     

Raman scattering study of the lattice dynamics of β-Zn4−xCdxSb3

Micro-Raman scattering experiments have been performed on the ternary solid solution in the Zn₄Sb₃–Cd₄Sb₃ system. Ten samples were studied; their compositions go from Zn₄Sb₃ to Zn_3.1Cd_0.9Sb₃. The homogeneity of these samples was checked by X-ray diffraction and electron microprobe analysis. The corresponding lattice parameters were calculated and their concentration dependence exhibits a small negative deviation from Vegard's law between end members of the Zn₄Sb₃–Cd₄Sb₃ system.

Three peaks and one shoulder are easily observable in the Raman spectrum of β-Zn₄Sb₃. These peaks are still present when the zinc atoms are substituted by cadmium ones. As the intensities of the Raman lines were observed to be very sensitive to the direction of the microcrystallites, only the change of the position could be discussed. From these experiments, we can suggest that the peak at about 155 cm⁻¹ should imply essentially Sb–Sb bondings while the peaks at about 172 cm⁻¹ and 320 cm⁻¹ must also imply Cd–Sb and Zn–Sb bondings.     

Surface modification of spherical LiNi1/3Co 1/3 Mn1/3O2 with Al2O3 using heterogeneous nucleation process

To improve the cycle stability at high voltage and high charge/discharge rate, spherical LiNi1/3Co1/3Mn1/3O2 was coated with Al2O3 by using heterogeneous nucleation process, and the physical and electrochemical properties were studied. The SEM images show that there is a uniform coating on the modified spherical LiNi1/3Co1/3Mn1/3O2. The electrochemical tests indicate that the properties of LiNi1/3Co1/3Mn1/3O2 coated with 0.5% aluminum oxide are the best. The initial capacities are 150 and 173 mA.h/g at the rate of I C in the voltage range of 2.7-4.3 V and 2.7-4.6 V, respectively, and the discharge capacities maintain about 99% and 85% after 30 cycles, respectively. While those of the bare LiNi1/3Co1/3Mn1/3O2 are only 90% and 75%, respectively. The CV tests of LiNi1/3Co1/3Mn1/3O2 show that Al203-coating can restrain the oxide-reduction peak currents fading during the charge/discharge course.     

Processing, microstructure, and properties of laser remelted Al2O3/Y3Al5O12（YAG） eutectic in situ composite

Laser remelting and rapid solidification were performed in preparing the high-performance Al2O3/Y3Al5O12（YAG） eutectic in situ composite. The microstructure characteristic and solidification behavior were studied using scanning electron microscopy（SEM）, energy dispersive spectroscopy（EDS）, X-ray diffractometry（XRD） and simultaneous thermal analysis（STA）. The hardness and fracture toughness were obtained using an indentation technique. The results show that the laser remelted Al2O3/YAG composite has a homogeneous eutectic microstructure without microcrack and pore. The component phases of Al2O3 and YAG are three-dimensionally and continuously reticular connected, and finely coupled without grain boundaries, colonies and amorphous phases between interfaces. The eutectic interspacing is greatly refined with increasing the scanning rate and average is only l μm. The synthetically thermal analysis indicates that the eutectic temperature of Al2O3-YAG is 1 824 ℃, well matching the phase diagram of Al2O3-Y2O3 system. The maximum hardness reaches 19.5 GPa and the room fracture toughness is 3.6 MPa.m^1/2.     

KF-AlF3系溶剂组成对KBF4与Al熔体界面反应的影响

研究了不同组成的KF-AlF3系溶剂对KBF₄与Al熔体界面反应的影响.结果表明,采用不同组成的KF-AlF₃系溶剂时,在氟化盐/Al界面处均有铝硼化合物层形成;当采用共晶成分或过共晶成分KF-AlF₃溶剂时,铝硼化合物层与Al之间存在的AlF₃可使铝硼化合物层与Al局部或完全脱离;当采用亚共晶成分KF-AlF₃溶剂时,在氟化盐/Al界面处未观察到AlF₃存在.对不同组成KF-AlF₃系溶剂和KBF₄的反应过程进行了研究,分析了氟化盐/Al界面处AlF₃的形成机理。     

Effect of calcination temperature on characteristics of LiNi1/3Co1/3Mn1/3O2 cathode for lithium ion batteries

LiNi1/3Co1/3Mn1/3O2 was synthesized by sol-gel method and effect of calcination temperature on characteristics of LiNi1/3Co1/3Mn1/3O2 cathode was investigated. The structure and characteristics of LiNi1/3Co1/3Mn1/3O2 were determined by XRD, SEM and electrochemical measurements. The results show that the compound LiNi1/3Co1/3Mn1/3O2 has layered structure with hexagonal lattice. With the increase of calcination temperature, the basicity of the material decreases, and the size of primary particle rises. The LiNi1/3Co1/3Mn1/3O2 calcined at 900 ℃ for 12 h shows excellent electrochemical performances with large reversible specific capacity of 157.5 mA-h/g in the voltage range of 2.75-4.30 V and good capacity retention of 94.03% after 20 charge/discharge cycles. Capacity of LiNi1/3Co1/3Mn1/3O2 increases with enhancement of charge voltage limit, and specific discharge capacities of 179.4 mA.h/g, 203.1 mA.h/g are observed when the charge voltages limit are fixed at 4.50 V and 4.70 V, respectively.     

Al_2O_3p/ZQSn6-6-3复合材料及其摩擦磨损特性

利用化学镀技术对增强颗粒Ａｌ２Ｏ３进行表面包覆Ｎｉ或Ｃｕ,用粉末冶金法制取Ａｌ２Ｏ３ｐ／ＺＱＳｎ６６３复合材料,研究了烧结工艺、颗粒体积分数、颗粒度、颗粒表面包覆Ｎｉ和Ｃｕ对复合材料性能的影响规律,综合评述了该材料的磨擦磨损行为。结果表明,化学镀Ｎｉ和Ｃｕ包覆Ａｌ２Ｏ３颗粒工艺能够有效地提高颗粒增强复合材料的耐磨性能。     

The ternary system Na2O–ZnO–WO3: Compounds and phase relationships

The subsolidus phase relationships of ternary system Na₂O–ZnO–WO₃ have been investigated by X-ray diffraction (XRD) and differential thermal analyzer (DTA). All the samples were synthesized in the temperature range from 530 to 850 °C in air. There are one ternary compound and five binary compounds in the Na₂O–ZnO–WO₃ system, which can be divided into eight three-phase regions. The crystal structure of the ternary compound Na_3.6Zn_1.2(WO₄)₃ is determined by single-crystal structure analysis method. It belongs to triclinic system with space group and lattice constants a = 7.237 (5) Å, b = 9.172 (6) Å, c = 9.339 (6) Å and  = 94.920 (4)°, β = 105.772 (9)°, γ = 103.531 (8)°, Z = 2. DTA analyses indicate that the compound Na₂WO₄ is not suitable to be the flux for ZnO crystal growth below 1250 °C, since no liquidus was observed in the system before 1250 °C.