基于Pro/E和MasterCAM的注塑模设计与加工

为了提高注塑模具设计与加工的质量和效率,更好地发挥各软件的特点,采用多种软件联合应用。以照相机面板注塑模为例,介绍了Pro/E在注塑模具设计中的应用以及在MasterCAM环境下的CAM实现。阐述了Pro/Moldesign的模具设计流程和优势,并运用MasterCAM对照相机面板凹模进行了仿真模拟加工。通过实例表明,两者结合使用能缩短模具生产周期和提高模具精度。     

注塑模具排气隙截面尺寸的设计计算

通过对塑料熔体填充型腔时的分析,介绍了型腔及浇注系统内的空气及塑料受热或凝固产生的低分子挥发气体必须排除。提出了对于大型模具及注射时间短的模具,最有效的方法是在模具上开设排气隙排气。详细阐述了排气隙的计算方法,设计实例。该设计方法既能排除气体,又能避免溢料,是一种合理有效的方法。     

新型水平分型脱箱造型线的应用

介绍了一种新型水平分型脱箱造型线,其特点为造型机采用射砂预紧实及随后的模板反压紧实,模板与砂箱呈"十"字穿梭,两工位机外下芯;砂型二次错箱的防止;独特的压铁及砂型夹紧机构。最后列举了新型造型线成功应用的实例。     

大方坯连铸结晶器电磁搅拌的数值模拟

对大方坯连铸结晶器电磁搅拌过程的流场和温度场进行了数值模拟,并讨论了搅拌强度对流场和温度场的影响。结果表明：在结晶器电磁搅拌下,搅拌器区域的钢液变为水平旋转,使从水口向下吐出的钢水与向上回流的钢水流股相冲突,流股侵入深度变浅,从而使轴向温度迅速降低,径向温度升高,提高了热区位置,有利于传热;搅拌强度越大,钢水的二次流现象越明显,热区位置越高。     

快速成形技术在铸造模具制造中的应用

介绍了各种快速成形技术的工艺原理,详细分析了快速成形技术在铸造模(如木模、蜡模、消失模、覆膜砂型(芯)、陶瓷型壳、铸造金属模等)制造过程中的具体应用,讨论了快速成形技术的发展方向。     

基于物理实验的闭挤式精冲工艺研究

针对闭挤式精冲的机理和工艺方法,设计制造了闭挤式精冲工艺实验模具,并采用不同厚度和直径的坯料进行实验;分析了闭挤式精冲工艺中外环填充率与剪切面光亮比例的关系以及外环填充率与工件增厚之间的关系,得出模具工作部分尺寸的计算方法。实验表明,闭挤式精冲是一种有效的冲裁低塑性材料和厚板的工艺。     

摆辗模具的失效及其热处理

分析了摆辗模具的工作原理、失效形式,摆辗模具在工作中除承受较大的压力和耐受较长时间的高温外.还要受到因反复加热、冷却而引起体积反复变化的交变应力等多种应力的作用,极易导致热疲劳龟裂的产生.选择合理的模具材料以及采用适宜的热处理工艺可以提高摆辗模具的强韧性,从而提高模具寿命.     

紧密结合模具专业的“机械制图”课程改革

通过对模具专业＂机械制图＂课程教学改革探索,结合一年来的改革实践,重点针对零件图、装配图的教学内容、教学方案及教学方法与手段几方面进行了详细分析,并提出了行之有效的改革思路和方法。实践证明,针对模具专业＂机械制图＂课程中零件图、装配图的教学改革,改变了传统教学模式下教师讲授枯燥、学生感觉学习空洞的局面。对提高学生的学习兴趣,提高教学质量,培养学生分析问题和解决问题的能力,具有良好的推动作用。     

Research of thermal response simulation and mold structure optimization for rapid heat cycle molding processes, respectively, with steam heating and electric heating

The dynamic mold temperature control system is the key of rapid heat cycle molding (RHCM) technology because it significantly affects the stability of the process, productivity and the quality of the final polymer part. For this reason, the approaches and techniques for dynamic mold temperature control were discussed in this study and two different dynamic mold temperature control methods, respectively, with steam heating and electric heating were found to be very feasible in mass production. The methods and principles of mold design for the two RHCM technologies were also discussed and then several different kinds of mold structures were designed. By constructing the corresponding thermal response analytical models for these RHCM molds, the temperature responses of the molding systems in the heating and cooling process of RHCM were simulated and studied. The effects of the mold design parameters such as the insulation layer between mold plate and mold inert, and mold material, on thermal response efficiency and temperature uniformity of the two RHCM processes were analyzed based on the simulation results. The results show that the insulation layer can increase the upper limit temperature of RHCM with steam heating and improve the heating speed of RHCM with electric heating. It can also greatly decrease the energy consumption of the two RHCM processes. The heating efficiency of RHCM with steam heating can be effectively improved by increasing the thermal conductivity of the cavity/core material, while the situation is diametrically opposite for RHCM with electric heating. Therefore, we acquired an optimized mold design principle and method for RHCM with steam heating and electric heating, respectively. Finally, a new electric heating mold with a cooling plate was proposed to enhance the cooling efficiency. The thermal response of this new electric heating mold was also simulated. The simulation results show that the cooling plate can significantly improve the cooling and heating efficiency.     

轮胎模具的设计制造和表面处理

论述了轮胎两半钢质模具和轮胎胶囊模具的基本设计及制造技术。对传统轮胎两半钢质模的加工工艺和焊花、镶花轮胎模具的加工工艺,电火花加工轮胎模具技术,CAD／CAM集成技术在模具加工的应用作了剖析和比较。轮胎模具型腔的镀硬铬、喷砂和喷干冰表面处理技术也一并作了介绍。探讨和展望了轮胎模具设计制造的发展趋势。