微车后灯外罩注塑工艺优化

灯具外罩通常用透明PMMA制作,外罩采用两次注塑成型,先做成嵌件,然后把嵌件放在另一副模具中注塑合成,通过对嵌件、外罩注塑成型工艺等的介绍,围绕外罩产品特点,进行产品重量的控制,用重量控制法达到产品质量。经生产实践验证,用重量控制法优化工艺能满足外罩成型要求,符合生产需要,操作简便可行,产品能得到用户的认同。     

重量法在灯具外罩注塑工艺中应用

灯具外罩是用透明有机玻璃料制作,本文通过对嵌件和外罩注塑的介绍,围绕外罩产品特点,进行必要产品重量的控制,用重量控制法达到产品质量。经生产实践验证,重量控制法能满足外罩成型要求,符合生产需要,操作简便可行,产品能得到用户的认同。     

聚甲醛双齿轮成型加工工艺研究

主要讨论聚甲醛双齿轮的成型工艺技术，重点分析了选材，嵌件处理，注射成型工艺和制件热处理等工艺因素，带有一个铝合金组合嵌件且两副齿的轴相互垂直的双齿轮最初采用尼龙制造，由于尼龙的吸湿性，金属嵌件注塑前没有进行热处理，注塑工艺上没有采取适当措施等原因，造成了双齿轮的同轴度垂直度严重超差，达不到设计要求，通过采取合理选材，嵌件热处理和成型工艺优化及制件热处理等措施，生产出满足设计要求的制品。     

注塑成型工艺对包塑成型嵌件变形的影响

利用ANSYS Workbench软件对汽车接插件成型过程中嵌件受力变形进行分析,分析细针状嵌件在注塑成型过程中的变形情况。采用包塑成型的优化工艺方案,先设计一个工艺过渡件,对细针状嵌件进行定位,再将工艺过渡件以嵌件的形式进行注塑成型,并对其嵌件受力进行分析。实际生产表明,应用包塑成型重叠注塑工艺可以提高产品质量,使其满足使用要求。     

力矩马达罩注塑工艺改进

用聚碳酸酯注射成型力矩马达罩时,产品易出现裂纹。为了解决此问题,就力矩马达罩注塑工艺提出改进方案,对模具、嵌件、材料作了相应的调整。经生产实践验证,工艺改进后,解决了产品裂纹的问题,操作可行,产品得到用户的认同。     

聚碳酸酯的注射成型工艺

分析了聚碳酸酯的注射成型工艺特性，讨论了影响聚碳酸酯制品质量的工艺因素，包括模具与设备、制品与嵌件结构、原材料干燥、注射温度、注射速率、注塑压力、成型周期、模具温度、制品后处理等。总结了聚碳酸酯注射成型制品常见的缺陷及解决措施。     

EXO二次注塑系统

陶氏化学公司开发的EXO二次注塑成型工艺，是一种以创新方式充分利用的生产工艺。这项技术首先将预先切割的装饰嵌件放入注塑模中。第一次注塑按照应用要求构成外壳材料结构的热塑性基材覆盖嵌件，再使用第二次注塑来密封背面模塑材料的边缘，使外壳材料具有非常好的耐用性、结实度和光泽。     

带镀银嵌件尼龙1010注塑制品的加工

从尼龙(PA)1010注塑制品的工艺入手,结合镀银嵌件的特点,对PA1010制品设计、成型工艺、操作要领等进行了试验,找到了确保镀银嵌件不因注塑受热而发生表面变色的有效方法,并确定了合理的注射成型工艺。发现采用低温成型不仅有利于PA1010注塑制品冲击强度的提高,而且对镀银嵌件镀层的质量起着至关重要的作用;采用250℃以上的高温将导致镀银嵌件镀层变色;针对该种注塑制品的各种成型缺陷提出了相应的对策。     

双模旋转式嵌件自动装载注塑模具设计

结合塑件带嵌件自动注塑成型的要求,设计了一种基于双色成型模式来进行嵌件注塑成型的双模成型模具,模具由两副子模具构成,一副子模具用于嵌件的自动装配,一副用于塑件的注塑成型。两副模具通过旋转支架的往复旋转对调来达到更换两副模具型腔的目的,从而实现嵌件自动安装于注塑模具模腔内后,进行塑件的自动化注塑。嵌件自动装配模具的使用,有利于减少注塑生产安全隐患和提高注塑生产效率。嵌件自动装载机构包括嵌件送料机构、嵌件排位机构、和嵌件模板压杆机构3个子机构,机构充分借用模具模板的开闭功能,利用油缸驱动齿轮转动来实现嵌件在模具动模顶杆上的输送、按序排列及自动压入顶杆上,实现嵌件的在模腔内的自动安装,机构设计新颖,有利于减少自动化生产成本。注塑子模具采用一次开模,两次顶出的方式来实现塑带嵌件塑件的完全脱模。     

基于双色旋转技术的嵌件自动给料注塑模具设计

根据塑件镶件注塑成型的需要,运用旋转式双色成型原理,设计了一种双模复合式自动化嵌件注塑模具。在工作时,模具由2副子模具组成,其中注塑模用于嵌件的注塑,装料模用于嵌件的自动装配。2副子模具的动模结构相同,不同的是两者的定模结构,注塑用的定模机构为模腔形式,而镶件装配用的定模机构则安装了嵌件装配机构。嵌件装配机构中,其自动装配机构包括3个子机构,嵌件送料机构用于嵌件的送料输送,嵌件排位机构用于8个孔腔槽中嵌件的排位,模板压杆机构将8个嵌件推入嵌件杆顶端,待旋转模架做180°旋转后进行注塑,完成塑件的自动化注塑。注塑模具中,注塑模具结构为1次开模,2次顶出的结构形式,2次顶出中,1次用于嵌件从嵌件顶杆上顶出分离,第2次顶出用于塑件的侧凹抽芯和完全顶出脱模。模具结构形式新颖,嵌件装料机构设计巧妙,灵活地运用双色模注塑原理,实现了带嵌件塑件的自动化注塑生产,具有较好的生产实用价值。     

基于Moldflow模拟分析整流器下盖的模具设计

对整流器下盖的模具设计解决了分型面的选择、镶件的结构、侧浇口位置确定、冷却系统的布局、塑件浇注系统布局等问题。同时,为了确定整个模具在注塑过程中的问题,通过Moldflow模拟分析软件对填充、浇口、排气、注塑成型时间等进行分析和优化。     

Research on a New Variotherm Injection Molding Technology and its Application on the Molding of a Large LCD Panel

The polymer injection products produced by using the current injection molding method usually have many defects, such as short shot, jetting, sink mark, flow mark, weld mark, and floating fibers. These defects have to be eliminated by using post-processing processes such as spraying and coating, which will cause environment pollution and waste in time, materials, energy and labor. These problems can be solved effectively by using a new injection method, named as variotherm injection molding or rapid heat cycle molding (RHCM). In this paper, a new type of dynamic mold temperature control system using steam as heating medium and cooling water as coolant was developed for variotherm injection molding. The injection mold is heated to a temperature higher than the glass transition temperature of the resin, and keeps this temperature in the polymer melt filling stage. To evaluate the efficiency of steam heating and coolant cooling, the mold surface temperature response during the heating stage and the polymer melt temperature response during the cooling stage were investigated by numerical thermal analysis. During heating, the mold surface temperature can be raised up rapidly with an average heating speed of 5.4°C/s and finally reaches an equilibrium temperature after an effective heating time of 40 s. It takes about 34.5 s to cool down the shaped polymer melt to the ejection temperature for demolding. The effect of main parameters such as mold structure, material of mold insert on heating/cooling efficiency and surface temperature uniformity were also discussed based on simulation results. Finally, a variotherm injection production line for 46-inch LCD panel was constructed. The test production results demonstrate that the mold temperature control system developed in this study can dynamically and efficiently control mold surface temperature without increasing molding cycle time. With this new variotherm injection molding technology, the defects on LCD panel surface occurring in conventional injection molding process, such as short shot, jetting, sink mark, flow mark, weld mark, and floating fibers were eliminated effectively. The surface gloss of the panel was improved and the secondary operations, such as sanding and coating, are not needed anymore.     

Moldflow在后盖注射模设计中的应用

以某移动空调后盖为例,针对注射成型过程中出现严重区边缺陷,运用专业模流分析软件Moldflow对后盖注塑件的注塑生产过程进行模拟分析,利用模拟结果优化模具结构,找到合理的注塑工艺参数,进而选定注塑机。     

Influence of injection velocity and joint geometry on quality of insert molding

A study of the influence of the injection velocity and the joint geometry on the quality of insert molding is presented. The proposed approach was based on the rheological concept, and the optimal injection velocity of insert molding was determined through calculations of the relative viscosity with corresponding injection velocities. In addition, the influence of the joint geometry between two different materials on the adhesion performance was also evaluated experimentally. A newly designed wafer cassette storage box that consisted of a cover (polybutylene terephthalate) with a transparent window (polycarbonate) and a base was given to demonstrate how to implement the methodology. Besides injection velocity, this study shows that the joint geometry is also a significant factor in improving the adhesion strength between the cover and the transparent window.POLYM. ENG. SCI., 2012. © 2011 Society of Plastics Engineers     

PC盖板注塑工艺及应用

PC盖板产品是用聚碳酸脂PC料制作的。通过对该产品的描述,用图表和计算方式解释选择材料、设备等依据,特别是产品注塑位置详细计算,就注塑成型工艺等参数方面提出一些具体要点进行介绍。经生产实践验证,工艺参数设置合理,能保证产品质量,应用可行,产品能得到用户的认同。     

Optimization for Injection Molding Process Conditions of the Refrigeratory Top Cover Using Combination Method of Artificial Neural Network and Genetic Algorithms

The process conditions have important influence on final part quality in injection molding, and how to get optimum process conditions is the key to improving part quality. Sinkmarks on the surfaces of injection-molded parts is one of the problems that limit the overall success of injection molding technology, and the presence of sinkmarks significantly impairs the surface quality of injection molded parts. A combination method of artificial neural network and genetic algorithms is proposed to optimize the injection molding process, and the processing parameters of a refrigeratory top cover are optimized using the combining method to minimize the sinkmarks on the part. The results indicate the combining method is an effective tool for the process optimization of injection molding.     

复杂盖板塑料件模具创新优化设计

通过对复杂盖板塑料件的结构进行分析,确定了其模具的设计方案为:采用镶件的形式实现小型芯成型;采用斜导柱侧抽机构实现侧孔的成型;采用一模一腔,点浇口4点进料。并对镶件、流道、水道和斜导柱4个方面的设计进行了优化创新。通过二维装配图阐述了模具的工作过程。通过CAE分析得到了优化后的注塑工艺参数。经生产实践表明,模具设计结构合理、工作可靠,生产的塑料件质量好,取得了较好的经济效益。     

气体辅助注射成型技术在电视机结构设计中的应用

介绍应用传统注射成型技术和气体辅助注射成型技术时，电视机结构设计方法的变化和区别．比较了它们在设计和生产上的优缺点。其中，在电视机面框和后盖的连接方式、显像管的安装固定方式、显像管的支撑方式、面框中螺钉柱的具体尺寸，以及面框底板前端部分的形状确定等诸多方面作了说明，这些设计的变化均可供设计师在进行塑料零件产品设计时参考和借鉴。