聚醚酰亚胺典型注塑制品成型技术

通过对聚醚酰亚胺塑料性能的研究,确定了典型制品过滤器壳体的注射成型工艺,证明了聚醚酰亚胺可用于制造特殊的过滤器壳体。结合工艺实践及最新的CAE成型理论提出了聚醚酰亚胺制品设计、模具设计、成型工艺的操作要点,为开发特种工程塑料制品积累了数据。     

聚醚酰亚胺过滤器壳体注射成型缺陷探讨

对聚醚酰亚胺过滤器壳体注射成型制件的缺陷尤其是开裂缺陷进行分析,发现模具温度的高低直接关系到制件的内应力大小,是引起开裂缺陷的主要原因;指出生产成型温度较高的工程塑料制品时,在工艺设计编制中要对模具温度提出相应的要求,并严格加以控制。     

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。     

大型注塑件充填不足缺陷探讨

从制品设计、模具设计、注射成型工艺等方面分析了大型注塑制品充填不足的原因,运用现代注射成型理论提出了相应的解决方法。结合大型注塑件充填不足的实例,对制品的充填不足缺陷进行了剖析,找到了产生缺陷的原因和相应的对策,为指导生产积累了经验。     

MBS制品注射成型工艺探讨

从工艺特性、模具设计、制品设计等方面探讨了(甲基丙烯酸甲酯/丁二烯/苯乙烯)共聚物(MBS)制品的注射成型技术,结合典型MBS碱性蓄电池壳介绍了注射成型中的各种工艺参数,并对MBS蓄电池壳加工中的缺陷、原因及解决方法进行了论述。     

聚砜注塑工艺及制品缺陷对策

介绍了聚砜(PSU)的结构、性能,并结合制品设计、模具设计等对PSU的注射成型要点进行了讨论。详细分析了PSU的注塑工艺参数,系统阐述了PSU在注射成型中常见的缺陷及解决方法。     

聚甲醛的成型加工

介绍聚甲醛（POM）的成型条件与性能的关系,着重阐述了POM挤出成型、注射成型的基本条件,以及注射成型中常见的制品缺陷及其解决措施等。     

热固性酚醛塑料注射成型技术

本文论述了热固性塑料注射成型原理、注塑料要求、注射机要求、模具要求以及注射成型工艺、制品缺陷及原因分析等。     

GFRPA66套管注射成型的缺陷和解决措施

采用玻璃纤维增强尼龙66(GFRPA66)为原材料生产铁路岔枕套管时经常出现各种制品缺陷,分析了这些缺陷产生的原因,提出了通过调整成型工艺条件(注射温度、注塑压力、注射时间等)、改进模具结构及对原料进行预干燥处理等解决措施。     

透明塑料过滤器壳成型工艺分析

结合透明过滤器塑料壳的特点,分析了透明过滤器塑料壳制造的过程与方法,从成型工艺过程及成型工艺条件的选择与控制方面进行了讨论。重点介绍了成型工艺过程和工艺条件的设定,指出了各种透明过滤器壳成型过程中可能出现的缺陷及其解决方法。     

PC注塑制品常见缺陷分析及解决方法

针对聚碳酸酯(PC)粘度高、热稳定性较差、成型加工困难的情况，对多年来注塑过程中遇到的各种制品缺陷及所采取的措施进行了深入的分析、总结。介绍了PC的加工特性及注塑制品中常见的变色、银纹、气泡、冷料斑及内应力等缺陷，分析其成因并提出了相应的解决方案。     

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.     

PMMA注射成型工艺及优化

在分析聚甲基丙烯酸甲酯（PMMA）的注射成型工艺特性的基础上,讨论了影响PMMA制品质量的工艺因素,包括模具及其浇口设计、烘干处理、注射温度、注射速率、注塑压力、停机处理等。并针对PMMA注塑制品常见缺陷提出了工艺优化措施。     

塑料制品注塑成型缺陷的成因分析

通过列举几种注塑成型过程中最为典型的几种缺陷,结合生产实际,从影响注塑成型制品质量的因素(产生的物理原因、注塑模具和制品结构、注塑工艺参数有关的原因、塑料材料)着手,分析了归纳注塑成型制品典型质量缺陷产生的原因,并提出了克服缺陷的具体改良措施。     

常见注塑成型缺陷及解决办法

由于塑料制品使用时外观要求高、抗冲击韧件要好,而注塑成型加工过程是一个涉及多方面因素的复杂加工流程,在生产过程中会出现产品缺陷,本文分析了生产塑料件时常见缺陷产生的原因,并从成型工艺条件(温度、压力、时间、注射速度等)的调整、模具结构合理性的修改、原料使用前处理等方面提出了解决问题的措施与对策。     

注塑成型光学制品折射率分层模拟与实验研究

与玻璃制造光学制品相比,高分子注塑光学制品具有质量轻、易加工、抗冲击性好等优点,在航空航天、精密透镜等高端领域得到广泛应用。然而受注塑过程复杂压力场、温度场的耦合作用,注塑透明制品折射率通常呈非均匀的分布,存在角偏差、光畸变等光学缺陷。因此,开展注塑工艺对其折射行为影响的模拟与实验研究,对实现折射率可控光学制品的成型具有重要意义。基于Hele Shaw注塑理论和Lorentz Lorenz物理光学理论,构建了注塑光学制品厚度方向折射行为分层预测模型,开发了相关模拟程序,基于自主研发的注塑模软件Z-Mold实现了注塑过程与折射率分布的一体化模拟。以聚碳酸酯注塑平板件为例,利用Brewster法对折射率模拟结果进行了验证。该方法成功应用到神舟系列航天舱外服面窗的研制。     

CAE技术在解决汽车内饰注塑产品缺陷中的应用

介绍了CAE技术在注塑产品生产中的应用。针对某车型的前门内饰板主体产品在注射成型过程中产生熔接痕和困气的缺陷,借助CAE软件找出了产生缺陷的原因,并通过对模拟结果的分析和评判,优化了浇注系统,解决了原模具设计方案的问题,最终生产出合格的产品,验证了CAE技术的可靠性和实用性。     

基于DOE实验的汽车塑件CAE优化与注塑模具设计

以某汽车塑件为例,针对其结构及分型复杂、注塑难等问题,基于DOE实验和CAE分析对其注塑所需工艺参数进行了仿真和优化。通过浇口位置和数量的优化,获得了理想的浇口设置;通过浇注系统的优化及成型窗口分析,获得了合理的流动分析工艺参数;对流动分析工艺参数进行正交试验优化,找出了产品注塑存在的潜在缺陷问题,经进一步对针阀控制进行寻优,解决了熔接线过长过多、充填不平衡、气孔较多等问题;通过翘曲和冷却分析的优化,最终获得了产品注塑成型所需的合理工艺参数,设计了一副结构合理的注塑模具,提高了模具生产效率。     

Study on preparing of ultrahigh-molecular weight polyethylene microporous materials by novel non-dense injection molding method

In this article, a novel method called non-dense injection molding with higher efficiency was proposed to prepare ultrahigh-molecular weight polyethylene (UHMWPE) microcellular open porous materials. The characteristics and the basic principle of the molding process were described, and the effects of shot size, injection pressure, and injection speed on microstructure, average pore size, porosity, and pore size distribution were further studied. The results showed that under the parameters of the shot size, injection pressure and injection speed set as 60%, 63.9 MPa, and 100%, the microporous UHMWPE materials were obtained with the average pore size 38.9 μm and porosity 38.3 vol% respectively, which were close to the microporous structure and properties of the commercial filter products prepared by traditional powder sintering method.