基于Pro/E的注塑模CAD/CAE/CAM集成化技术

介绍了模具CAD／CAE／CAM集成化技术的产生与发展趋势，指出了基于Pro／E软件的注塑模CAD／CAE／CAM集成化技术的特点和系统结构，分别分析了模具CAD／CAE／CAM集成化技术在注塑模设计阶段、分析阶段和制造阶段的应用过程，阐述了其对缩短制造周期、降低模具成本、提高制品质量的积极意义。     

CAD/CAE/CAM软件技术在塑料工业中的应用研究

计算机辅助设计(CAD)/计算机辅助工程(CAE)/计算机辅助生产(CAM)软件技术是当代塑料工业生产的重要辅助工具,用于塑料加工中模具的设计和制造、成型工艺优化和参数确定等方面,可有效提高塑料制品的生产效率和产品合格率.详述了CAD/CAE/CAM软件技术在塑料工业中的应用研究。     

我国注塑模具CAD／CAE／CAM技术的研究与应用

文章介绍了近几年来国内注塑模具CAD/CAE/CAM技术研究已取得的成果,评价了国内自行开发的注塑模具CAD/CAE/CAM水平与各个方面的研究进展以及在引进工作中存在的问题,提出了注塑模具CAD/CAE/CAM技术研究与应用的方向及开发战略。     

基于CAD/CAM技术的坐便器产品研发

目前坐便器手工研发模式是产品开发周期长、成本高、质量低等问题的直接原因，借鉴先进制造技术在其它制造行业中的成功应用，提出了改变传统手工研发模式．应用CAD／CAM进行坐便器产品研发的技术方案，解决了坐便器模具CAD／CAM的关键技术问题，并应用于实际的坐便器研发，取得的良好效果。CAD／CAM技术的应用能大大缩短产品研发周期、提高产品质量、降低开发成本。     

基于快速原型技术的陶瓷盆快速制模工艺

卫生洁具一类的复杂陶瓷产品的制模一直采用手工方法。本文以洗手盆为例介绍了一种基于CAD/CAM/RP技术的新的快速制模工艺,在产品三维CAD模型的基础上采用快速原型技术快速、准确地制出陶瓷模种,然后翻制工作模。新工艺不但提高了产品质量,而且可缩短新产品开发时间一倍以上。     

浅谈化工设备设计中CAD/CAM/CAE的应用

化工设备及其零部件在工况下受到多种多样的外力作用,如风力,内外压力等。如何实现化工设备高效安全生产,化工装备及其零部件的设计与制造就显得至关重要。本文结合当今国内外机械设计制造领域一些先进的设计理念与方法,概要地介绍了CAD/CAM/CAE在化工设备设计中的一些应用,并以高级CAD/CAM/CAE软件UG与ANSYS做了一些简单的应用实例。     

陶瓷模具CAD/CAM制造技术

在传统陶瓷模具制造基础上,提出以CAD/CAM制造技术为中心,融合了快速成型技术与逆向工程技术的陶瓷模具设计制造技术。以紫砂壶为例,通过逆向工程方法,详细介绍了加工一个茶壶工作母模制造过程。设计制造周期短,大大提高了陶瓷产品生产竞争力。     

模具先进制造技术的发展

着重对模具CAD／CAE／CAM技术、先进模具制造加工技术、模具材料及表面工程技术、模具工业的逆向工程等进行了综述；分析探讨了模具工业新制造哲理与新模式。     

基于并行工程的中空吹塑模集成系统研究

针对采用传统的串行模式进行中空吹塑模具设计和制造中存在的问题,提出基于并行工程的中空吹塑模集成系统流程,使其贯穿于中空吹塑成型的共性机理研究、制品设计、模具设计与制造和试模的全过程,并讨论制品设计与模具CAD/CAE/CAM的并行设计、中空吹塑产品的特征建模、中空吹塑模CAD/CAE/CAM知识和规则处理机制等关键技术。     

基于CAD/CAE/LOM技术的卫生陶瓷种型的开发工艺

卫生洁具是结构最为复杂的陶瓷产品之一,其新产品开发一直沿用传统的手工制作工艺,产品质量低、开发周期长、成本高。针对这一情况,借助CAD/CAE/LOM技术对传统开发工艺的关键环节进行改造研究,实践了一条数字化开发的新途径。实践表明:卫生陶瓷产品的数字化开发工艺切实可行,为卫生陶瓷品种花色的多样化、个性化提供了现代化开发手段。     

EVA/EPDM/IR/IR共混发泡材料的性能研究

研究了乙烯醋酸乙烯酯共聚物（ＥＶＡ）／ＥＰＤＭ／ＩＲ三元共混和ＥＶＡ／ＥＰＤＭ／ＩＲ／ＩＲ四元共混发泡材料的性能。在ＥＶＡ中混入ＥＰＤＭ可使发泡材料的拉伸强度、撕裂强度和粘合强度提高,而收缩率和压缩永久变形降低;在ＥＶＡ中混入ＩＲ除具备混入ＥＰＤＭ同样的优点外,还可提高发泡材料的柔性;ＩＲ的混入可改善发泡材料二次热压成型制品的表面清晰度。     

SO42-/MxOy型固体超强酸研究进展

SO₄^2-/M_xO_y固体超强酸具有不腐蚀设备、污染小、耐高温、对水稳定性好和可重复使用等优点。综述了SO₄^2-/M_xO_y型固体超强酸的催化机理、失活原因、改性及表征方法,并对今后SO₄^2-/M_xO_y型固体超强酸的研究方向进行了展望。     

Microwave Dielectric Properties of CaTiO3-CaAl1/2Nb1/2O3 Ceramics Doped with Li3NbO4

The microwave dielectric properties of CaTi_{1− x} (Al_1/2Nb_1/2) _x O₃ solid solutions (0.3 ≤ x ≤ 0.7) have been investigated. The sintered samples had perovskite structures similar to CaTiO₃. The substitution of Ti⁴⁺ by Al³⁺/Nb⁵⁺ improved the quality factor Q of the sintered specimens. A small addition of Li₃NbO₄ (about 1 wt%) was found to be very effective for lowering sintering temperature of ceramics from 1450–1500° to 1300°C. The composition with x = 0.5 sintered at 1300°C for 5 h revealed excellent dielectric properties, namely, a dielectric constant (ɛ_r) of 48, a Q × f value of 32 100 GHz, and a temperature coefficient of the resonant frequency (τ_f) of −2 ppm/K. Li₃NbO₄ as a sintering additive had no harmful influence on τ_f of ceramics.     

Ferromagnetism and Magnetoresistance in La0.67Sr0.33Fe0.07Mn0.93O3

A bulk ceramic sample La_0.67Sr_0.33Fe_0.07Mn_0.93O₃ (LSFMO) with a rhombohedral structure has been prepared from a coprecipitated carbonate precursor in this study. Ferromagnetism and a negative, isotropic magnetoresistance (MR) as large as 11% have been observed in a ceramic sample of LSFMO. There are two resistivity transition peaks on the resistivity versus temperature curves. The resistivity peak and MR have been related to the ferromagnetic state in LSFMO.     

Effect of V2O5 Doping on the Sintering and Dielectric Properties of M-Phase Li1+x−yNb1−x−3yTix+4yO3 Ceramics

The effect of the addition of V₂O₅ on the structure, sintering and dielectric properties of M -phase (Li_{1+ x − y} Nb_{1− x −3 y} Ti _x +4 _y )O₃ ceramics has been investigated. Homogeneous substitution of V⁵⁺ for Nb⁵⁺ was obtained in LiNb_{0.6(1− x )}V_{0.6 x} Ti_0.5O₃ for x ≤ 0.02. The addition of V₂O₅ led to a large reduction in the sintering temperature and samples with x = 0.02 could be fully densified at 900°C. The substitution of vanadia had a relatively minor adverse effect on the microwave dielectric properties of the M -phase system and the x = 0.02 ceramics had [alt epsilon]_r= 66, Q × f = 3800 at 5.6 GHz, and τ_f= 11 ppm/°C. Preliminary investigations suggest that silver metallization does not diffuse into the V₂O₅-doped M -phase ceramics at 900°C, making these materials potential candidates for low-temperature cofired ceramic (LTCC) applications.     

聚烯烃塑料用胶粘剂SBS／MMA／BA／MAA的合成与性能研究

以甲基丙烯酸（MAA）为功能单体,与SBS和甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）进行四元接枝共聚,合成了聚烯烃塑料用胶粘剂,探讨了不同溶剂、MMA／BA配比、MAA和BPO用量以及固化时间对粘接性能的影响,并对该四元接枝胶的性能与三元胶和SBS／MMA／BA／AA四元接枝胶进行了比较。结果发现：四元接枝胶性能优于三元胶,特别是与异氰酸酯配合时,剪切强度、固化速度明显提高,四元胶的优化配方是120＃汽油：甲苯：乙酸乙酯为8：1：1,MMA：BA配比3：1,MAA加入量7份,BPO用量1．5－2份（以100份SBS计）。     

BA／VAc／AN／AA共聚乳液胶粘剂的研制

介绍了一种丙烯酸丁酯／醋酸乙烯酯／丙烯腈／丙烯酸四元共聚乳液胶粘剂的制备方法,该胶具有良好的耐黄变性,可替代天然橡胶胶乳应用于EVA低发泡体与腈纶绒面布的复合。     

Electronic Structure and Bonding in Crystalline Y10[SiO4]6N2

The electronic structure and bonding of the complex ceramic crystal Y₁₀[SiO₄]₆N₂ is studied by a first-principles method. It is shown that this crystal is an insulator with a direct band gap of 1.3 eV. It has some unique properties related to the one-dimensional chain structure in the c -direction and the planar N-Y bonding in the x - y plane.     

Relaxor Behavior of the 0.9BaTiO3–0.1La(Mg1/2Ti1/2)O3 Solid Solution

Low-frequency dielectric response of air- and oxygen-sintered ceramics with the composition 0.9BaTiO₃–0.1La(Mg_1/2Ti_1/2) O₃ (0.9BT–0.1LMT) has been studied in the temperature range of 12–550 K. In comparison with pure BT, in 0.9BT–0.1LMT the dielectric permittivity maximum is shifted by almost 300 K toward lower temperatures. Both real and imaginary parts of dielectric permittivity of the solid solution, in the range 12–150 K, show a strong frequency-dependent behavior, which is typical of relaxors. On the basis of the model of exponential cluster size distribution and the Cole–Cole equation, the degree of interaction between the polar clusters was estimated. It was shown that the oxygen vacancies arising during sintering at high temperatures did not affect noticeably the relaxor properties of the material. The role of heterovalent La³⁺/Ba²⁺ and Mg²⁺/Ti⁴⁺ substitutions in the relaxor behavior formation is discussed.     

A- and B Site Cosubstituted Ba6−3xSm8+2xTi18O54Microwave Dielectric Ceramics

Tin (Sn) substitution into the B-site and Nd/Sn cosubstitution into the A- and B-sites were investigated in a Ba _{6−3 x} Sm_{8+2 x} Ti₁₈O₅₄solid solution ( x = 2/3). A small amount of tin substitution for titanium improved the temperature coefficient of resonant frequency (τ_f) but led to a decrease of the relative dielectric constant (ɛ) and the quality factor ( Qf ). The Ba_{6−3 x} Sm_{8+2 x} (Ti_{1− z} Sn_z)₁₈O₅₄-based tungsten-bronze phase became unstable for compositions with a tin content of ≥10 mol%, where BaSm₂O₄and Sm₂(Sn,Ti)₂O₇appeared, and finally, these phases became the major phases. On the other hand, Nd/Sn cosubstitution led to a good combination of high ɛ, high Qf , and near-zero τ_f. Excellent microwave dielectric properties were achieved in Ba_{6−3 x} (Sm_{1− y} Nd _y )_{8+2 x} (Ti_{1− z} Sn _z )₁₈O₅₄ceramics with y = 0.8 and z = 0.05 sintered at 1360°C for 3 h: ɛ= 82, Qf = 10 000 GHz, and calculated τ_f=+17 ppm/°C. The tolerance factor and electronegativity difference exhibited important effects on the microwave dielectric properties, especially the Qf value. A large tolerance factor and high electronegativity difference generally led to a higher Qf value.