压铸模浇注系统CAD开发

以PRO／E为开发平台,采用VC＋＋,Pro／Toolkit及ACCESS为开发工具,实现压铸模浇注系统的参数化设计和三维造型,减少设计人员的工作量,缩小压铸模浇注系统设计周期,从而为压铸模的整体设计制造奠定重要基础。     

汽车覆盖件模具CAPP关键技术研究

在分析汽车覆盖件模具CAD/CAM技术特点和覆盖件模具CAPP 关键技术基础上,提出了基于宏工艺的面向数控编程的包含自由曲面类零件数控加工工艺规划模型,解决了曲面加工特征识别的难题-并提出了曲面数控加工区域划分的概念,在子区域内优化走刀路线的策略,解决了曲面数控加工刀具轨迹优化问题.     

Dynamic Theory of Die Swell for Entangled Polymeric Liquids in Tube Extrusion: Correlations of Total and Ultimate Extrudate Swell Effects to Growth Time,Shear Stress and Aspect Ratio Under the Free States

The dynamic theory of die swell deduced in a previous paper was extensively applied to study the xtrudate swelling behaviors of two entangled polymeric liquids (HDPE and PBD) in a simple shear flow at steady shear stress. The mechanism and dynamics for the recoils and the recoveries of viscoelastic strains in the extrudate were investigated under the free recovery and dynamic states. It was found that in the course of recovery the free recoil and the growth of die swell in the extrudate may be divided into two recovery regions (instantaneous and delayed regions) and three growth stages (instantaneous, delayed, and ultimate extrudate swelling stages). The free recoil and the extrudate swelling behaviors may be expressed as a function of shear stress. The correlations of instantaneous, delayed, total and ultimate extrudate swell effects to the molecular parameters and the operational variables in the simple shear flow at steady shear stress were derived from the dynamic theory of die swell. Also, two sets of new universal equations on the total extrudate swelling effect (TESE) and ultimate extrudate swelling effect (UESE) were deduced. The first is the universal equation of the logarithmic correlation between the TESE and the growth time under the free and dynamic states; the second is the universal equation of the logarithmic correlation between the UESE and the operational variables under the free and equilibrium states. The first equation was verified by experimental data of PBD with different molecular weights at different operational variables. The second equation was verified by experimental data of HDPE at two temperatures and different operational variables. An excellent agreement result was obtained. The excellent agreement shows that the two universal equations can be used directly to predict the correlations of the TESE and UESE to the growth time, the molecular parameters, and the operational variables under the dynamic and equilibrium states.     

谢枋得《叠山集》版本源流考

谢枋得生前杂著诗文64卷,称为《叠山集》。由于屡经战乱,散佚严重,存者无几。至明代由枋得同乡黄溥采集遗佚,成十六卷本,于景泰五年（1454）首次刊刻,后代刊刻之各种版本均由此本增删而成。《叠山集》的现存版本主要有十六卷本、二卷本、六卷本、五卷本、四卷本等。因版本较多且流传情况复杂,今加以梳理,使其脉络清晰。     

冷挤压单层凹模材料优选

传统模具设计在选材时对于经验依赖性强 ,且具有盲目性 ,不利于实现设计过程的计算机化。本文以传统解析法作为凹模设计的理论基础 ,综合分析了影响凹模强度及总直径比的各个因素 ,进一步研究参数、σsi、pi、α之间的相互关系 ,确定出适合于单层凹模冷挤压的压力范围 ,从而使模具层数预估 ,材料选用 ,以及设计过程更合理     

浅谈我国模具材料的发展方向

该文介绍了国内外模具材料在产量、品种、工艺方面的发展状况,并对今后我国模具材料的发展方向进行了展望。     

线束端子压接工艺及模具研究

本文分析了桑塔纳轿车接插件上常用线束端子压接体的主要质量指标及其影响因素;通过实验研究,提出了线束端子压接工艺和模具的设计原则和方法.