精密注射成型影响因素分析探讨

精密注射成型作为一种新的注射成型工艺方法,其特点就是能成型尺寸精度高,而且具备良好的机械、力学性能以及尺寸稳定性的塑料制品.本文从塑料材料、模具设计与制造、成型工艺和成型设备等方面对影响精密注射成型的因素进行了讨论,并给出了相关的解决办法.选择适当的塑料原材料、提高模具设计与制造质量、控制好注塑工艺参数及合理选择注塑成型设备,才能更好地发挥精密注射成型技术在塑料制品成型生产中的作用,成型出高精度、高性能的精密塑料制品.     

微注射成型技术的现状与发展

阐述微注射成型技术的产生背景、应用领域和发展前景,详细介绍了微注射成型技术的所用原料、设备及工艺特点,概述了微注射成型机理仿真与实验研究的现状,展望微注射成型技术的发展趋势。     

粉末注射成型工艺的现状及研究进展

粉末注射成型工艺的现状及研究进展西南技术工程研究所（６３００３９）伍太宾金属、陶瓷粉末注射成型工艺是传统的粉末冶金工艺与塑料成型工艺相结合的新工艺。其基本过程为：各种金属、陶瓷粉末与有机粘接剂均匀混合成具有流动性的膏状物质，然后在塑料注射成型机上注射...     

粉末注射成型工艺

粉末注射成型工艺山东金珠粉末注射制造有限公司［２５００３３］曾凡同杨英清一、前言金属、陶瓷粉末注射成型工艺技术是一种将粉末冶金工艺、粉末陶瓷工艺与塑料注射成型工艺相结合的新型制造工艺技术。简单地说：就是采用塑料注射成型工艺技术,制造金属、陶瓷零件。该...     

汽车零件的注气注射成型

在评述了注射成形和结构泡沫塑料成型的优点和局限性之后，提出了兼具两者之长的注气注射成型工艺，并以几种汽车零件的注气注射成型工艺，并以几种汽车零件为例，说明其在质量、周期、成本诸方面的优越性。     

超高速注射成型及模具技术

介绍了超高速注射成型技术的特点和应用，指出了超高速注射成型模具与普通注射成型模具的差异，重点阐述了超高速注射成型模具排气系统的设计，并给出了设计工艺参数。     

轿车零件的注气注射成型

本文在论述注射成型和结构泡沫成型的优缺点基础上，提出了能克服上述两种方法缺点的注气注射成型工艺方法，并列举了该方法在轿车零件制造中的应用．     

轿车零件的注气注射成型

本文在论述注射成型和结构泡沫成型的优缺点基础，提出了能克服上述两种方法缺点的注气注射成型工艺方法，并列举了该方法在轿车零件制造中的应用。     

成型参数对纯铜粉末注射生坯密度的影响

结合粉末注射成型工艺的特点,通过预混粘结剂组分、分批次加入铜粉获得成分均匀的注射成型喂料,利用正交试验方法分析了注射成型参数（成型压力、保压时间）对注射试样生坯密度的影响,得到了纯铜粉末注射成型的最佳参数。     

高光注射成型技术的发展及应用

介绍了高光注射成型技术的工艺过程,深入分析了高光注射的主要特点,比较高光注射成型与普通注射成型的主要区别,分析了高光注射成型模具的特点,最后指出了高光注射成型技术的应用范围与前景,并指出了水辅注射成型技术今后有待解决的几个关键性问题.     

气体辅助注射成型技术研究综述

介绍了气体辅助注射成型技术的工作原理,气辅成型的组成系统及关键技术。讨论了气体辅助注射成型技术的特点。     

浅析注射成型塑料件结构设计

从注射成型塑料件结构设计的角度出发,结合材料本身特性及注塑生产的工艺特点,总结了注射成型塑料件结构设计上的一些要点和注意事项,列举了若干设计中经常采取的结构形式和改进方法,为注射成型塑料件的结构设计给出了参考。     

精密注塑模具的注塑成型模拟

在精密注塑模具设计过程中应用计算机辅助分析的方法模拟注塑成型过程,对保证注塑成型产品的质量,提高生产率有极大的优越性。利用MoldflowPlasticInsight(MPI)软件对精密注塑模具的注塑成型过程进行了模拟,分别介绍了注塑参数、浇注系统和冷却系统的设计过程,比较了两套不同设计方案的注塑成型模拟结果。并对影响翘曲变形的各个因素进行了详细的分析。     

光学塑料透镜注射成型关键技术的研究

传统的塑料模具设计及注射成型工艺参数对经验的依赖性较强,难以满足高精度光学塑料元件的成型需求.采用CAD/CAE技术对光学塑料透镜注射成型的充模及保压过程进行了计算机动态模拟,研究了不同注射温度、压力、时间和保压温度、压力、时间对透镜面形质量的影响规律.     

Three-dimensional numerical simulation for plastic injection-compression molding

Compared with conventional injection molding, injection-compression molding can mold optical parts with higher precision and lower flow residual stress. However, the melt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compression and the nonlinear problems caused by non-Newtonian polymer melt. In this study, a 3D simulation method was developed for injection-compression molding. In this method, arbitrary Lagrangian- Eulerian was introduced to model the moving-boundary flow problem in the compression stage. The non-Newtonian characteristics and compressibility of the polymer melt were considered. The melt flow and pressure distribution in the cavity were investigated by using the proposed simulation method and compared with those of injection molding. Results reveal that the fountain flow effect becomes significant when the cavity thickness increases during compression. The back flow also plays an important role in the flow pattern and redistribution of cavity pressure. The discrepancy in pressures at different points along the flow path is complicated rather than monotonically decreased in injection molding.     

气体辅助注射成型数值模拟技术研究概述与展望

在介绍气体辅助注射成型数值模拟技术及其重要性的基础上,对气体辅助注射成型数值模拟技术的国内外研究现状进行了概述,并且对气体辅助注射成型数值模拟技术研究发展方向进行了展望。     

用注射分析对悬浮填料结构优化

悬浮填料的结构对其挂膜性能影响较大,设计时需要重点考虑其结构优化.在现有悬浮填料结构的基础上进行改进,设计三种新型填料结构,采用注射分析软件对这些悬浮填料的注塑性能进行模拟计算,了解塑胶熔体在填料模腔中的流动状况,得到这些填料结构上各点的注塑时间、塑胶压力、温度和塑胶流动状况等数据,并根据这些数据比较它们之间的注塑优劣,数据显示,加筋多面空心球结构注射性能比较好.     

Intelligent control of gas-assisted injection molding control systems

This study described the design and construction of gas-assisted injection molding systems incorporating a traditional injection molding machine. This combined system is called a gas-assisted injection molding control system (GAIMCS). The mathematical model of GAIMCS with nonlinear dynamics is difficult to establish accurately. Therefore, model-free intelligent control strategies were developed to control this system and evaluate its control performances. This work presents two intelligent control strategies: (1) traditional fuzzy controller (TFC), and (2) grey prediction fuzzy controller (GPFC). The GAIMCS was controlled by the GPFC, which was compared to a TFC to evaluate the system control performance. The GPFC achieves better control performances in accelerating rise time, and it reduces the system steady-state error better than the TFC for high-pressure gas control in GAIMCS, based on the verified experimental results.     

基于BP-NSGA的注塑参数多目标智能优化设计

为获得成型性能最优的注塑参数设计方案,提出了基于BP神经网络和非支配排序遗传算法的注塑参数多目标优化方法。将注塑模结构尺寸参数和注塑工艺参数作为待优化的设计变量,建立了以高质量、低成本、高效率为优化目标的注塑参数优化设计模型。基于非支配排序遗传算法获取给定参数范围内的所有Pareto最优解,并通过建立多输入和多输出的BP神经网络来快速获得非支配排序遗传算法优化进程中所有个体的适应度值。开发了基于BP神经网络与非支配排序遗传算法集成的注塑参数智能优化设计系统,并通过鼠标注塑参数设计实例,验证了其适用性和有效性。     

Surface microstructure replication in injection molding

In recent years, polymer components with surface microstructures have been in rising demand for applications such as lab-on-a-chip and optical components. Injection molding has proven to be a feasible and efficient way to manufacture such components. In injection molding, the mold surface topography is transcribed onto the plastic part through complex mechanisms. This replication, however, is not perfect, and the replication quality depends on the plastic material properties, the topography itself, and the process conditions. This paper describes and discusses an investigation of injection molding of surface microstructures. The fundamental problem of surface microstructure replication has been studied. The research is based on specific microstructures as found in lab-on-a-chip products and on rough surfaces generated from EDM (electro discharge machining) mold cavities. Emphasis is put on the ability to replicate surface microstructures under normal injection-molding conditions, i.e., with commodity materials within typical process windows. It was found that within typical process windows the replication quality depends significantly on several process parameters, and especially the mold temperature. For the specific microstructures, evidence suggests that step-height replication quality depends linearly on structure width in a certain range.