振动气体辅助注射成型新技术

介绍了一项关于塑料制品的气体辅助注射成型新技术———振动气体辅助注射成型(VGAIM)。结合目前的塑料气体辅助注射成型及动态注射成型研究成果,详细叙述了振动气体辅助注射成型技术产生的背景及其基本原理,且具体介绍了振动气体辅助注射成型的工艺实现装置,并就其在改善制品结构性能和改进聚合物熔体填充机理中的应用进行了探讨。最后对其应用前景提出了展望。     

流体辅助注射成型技术

流体辅助注射成型技术是一种塑料与流体的复合注射技术，它包括气体辅助注射成型和水辅助注射成型2种形式。分别介绍了气体辅助注射成型和水辅助注射成型的工艺过程、设备及特点。     

气体辅助注射成型在彩电机壳成型上的应用

介绍了气体辅助注射成型技术的工作原理,康佳彩电机壳应用气体辅助注射成型的设备及工艺.此工艺的普及正激励着设计和成型方面令人兴奋的创新和注射原理持续不断的变革,对于塑料制品注射成型行业积极采用气体辅助注射成型新技术有一定的推动作用.     

基于气体穿透效果数值模拟的气体辅助注射成型工艺优化

对气体辅助注射成型工艺进行分析，阐述了气体辅助注射成型的关键技术要求在分析熔料流动、气体穿透物理模型的基础上，探讨了气体辅助注射成型数值分析的实现原理运用MPI／Gas模块对一T型支架进行了气体辅助注射成型CAE分析，模拟不同工艺条件下的气体穿透效果，确定了合理的工艺参数。     

气体辅助注射成型技术与装置

本文介绍了气体辅助注射成型技术的发展史、特性及装置的构成。阐述了气体辅助注射成型的工艺过程及应用该技术的关键,井以实例说明了气体辅助注射成型的优越性。     

气体辅助注射成型技术原理及应用

本文详细介绍了气体辅助注射成型技术的工艺过程与装备，分析了气体辅助注射成型的特点和应用，并对气体辅助注射成型CAE技术作了简要说明。     

气体辅助注射成型模拟的数学描述及常用模拟软件概述

首先介绍了建立气体辅助注射成型数学模型的基本思想和成型过程中流体运动基本定律的数学描述,然后介绍了气体辅助注射成型模拟的基本流程和目前市面上常用气体辅助注射成型数值模拟软件。     

气体辅助注射成型关键技术研究

介绍了气体辅助注射成型原理、成型周围和技术优势，说明了气体辅助注射成型生产工艺和制品设计特点。     

气体辅助注射成型关键技术研究

介绍了气体辅助注射成型原理、成型周期和技术优势,说明了气体辅助注射成型生产工艺和制品设计特点。     

期刊文摘

使用CO2 气体辅助注射成型技术　 (日 )《プラスチックス》　第 5 4卷　第 8期　第 46～ 48页　 2 0 0 3年由日本旭化成公司成功开发的CO2气体辅助注射成型技术得到优质成型制品 ,特别是赋予制品外观非常光洁光亮。使用CO2 气体辅助注射成型的原理是 :使用CO2 气体供给计量装置 ,在注射成型前 ,同时向模具和塑化料筒中注入CO2 气体 ,CO2 气体以增塑剂的形式与熔融树脂混合 ,进行注射成型加工。由日本住友公司成功开发“AMOTEC”CO2 气体辅助注射成型专用注射成型机 ,其主要特点 :1)成型树脂中混入CO2 气体后 ,大幅度降低熔体黏度 ,…     

气体辅助注塑及其产品设计特点

介绍了气体辅助注射成型技术及其产品的一些设计特点,并将气体辅助注塑工艺与传统注塑工艺的优缺点进行了比较。     

气体辅助注射成型技术

介绍了消除厚壁制件所出现的缩痕、凹痕缺陷的一种新型塑料成型工艺－－气体辅助注射成型技术的工作原理,技术关键、设备配置及其应用,并重点介绍了内置气体辅助成型和表面气体辅助成型技术。     

Experimental investigation and numerical simulation of cooling process in water assisted injection moulded parts

Abstract

This report investigated, both experimentally and numerically, the cooling process in water assisted injection moulded parts. Experiments were carried out on a laboratory developed water assisted injection moulding system, which included an injection moulding machine, a water pump, a water injection pin, a water tank equipped with a temperature regulator, and a control circuit. The resin used was semi-crystalline polypropylene. The in-mould temperature of the polymeric materials during the cooling process was measured. A transient heat transfer finite element model was adopted to simulate and predict the temperature variation within water assisted injection moulded products. Simulated results matched well with the experimental data. Experimental investigation and numerical simulations of a water assisted injection moulding cooling process can provide an improved understanding of the influence of water related parameters on the cooling process of water assisted injection moulded parts.     

Experimental study of weldline caused by flow lead effect in gas assisted injection moulded parts

Abstract

Gas assisted injection moulding has become one of the most important methods for the manufacture of plastic products. However, there are several unsolved problems that confound the overall success of this technique. The weldline caused by the flow lead effect in the polymer melt is one of them. In this report, an L′18 orthogonal array design based on the Taguchi method has been conducted to investigate the flow lead induced weldlines in gas assisted injection moulded parts. A plate cavity with a gas channel on the side was used for moulding. Experiments were carried out on an 80 t reciprocating screw injection moulding machine equipped with a high pressure gas injection unit. After moulding, the depth of the weldline was measured. For the factors selected in the main experiments, melt injection temperature and mould temperature were found to be the principal factors affecting the weldline depth of gas assisted injection moulded parts. Experimental investigation of a gas assisted injection moulding problem can help in better understanding the weldlines caused by flow lead effects, so that steps can be taken to optimise the surface quality of moulded parts. PRC/1755     

Gas assisted injection moulding: Finite element modelling and experimental validation

Abstract

Gas assisted injection moulding of a rectangular cross-section tensile test specimen has been modelled using a finite element implementation of the pseudo-concentration method, in which the velocity components and pres sure are interpolated as primitive variables. Two-dimensional and three- dimensional modelling formulations are presented and in each case wall thickness predictions are compared with actual measurements taken from specimens obtained from computer monitored gas assisted injection moulding production. Two different boundary conditions were used for the injection of gas into the cavity.

Initial mechanical testing is used to compare the apparent elastic modulus of the solid material in gas assisted injection moulding specimens with that in solid polymer specimens.     

Variations in surface gloss on parts made by gas assisted injection moulding

Abstract

Gas assisted injection moulding has proved to be a breakthrough in moulding technology for thermoplastic materials. However, there are still unsolved problems that limit the overall success of this technique. The aim of this work was to study the phenomenon of gloss variations occurring across the surfaces of gas assisted injection moulded parts. Experiments were carried out on an 80 t injection moulding machine equipped with a high pressure, nitrogen gas injection unit. The materials used were pigmented acrylonitrile/butadiene/ styrene and polypropylene. A plate cavity with a gas channel across its centre was used to mould the parts. Various processing parameters were varied: melt temperature; mould temperature; melt filling speed; short shot size; gas pressure; and gas injection delay time. After moulding, a glossmeter was used to determine the effects of these processing parameters on the surface gloss profiles of the parts. A roughness meter and scanning electronic microscope were also employed to characterise the surface quality of moulded parts. In addition, a numerical analysis of the filling process was carried out to help better understand the mechanisms responsible for the phenomenon of surface gloss variations. It was found that the surface gloss difference occurs mainly in the transition area between channel and plate in the moulded parts, which might be the result of the shear stress gradient in the polymer melt during the filling process. Surface roughness of moulded parts might also be another factor resulting in the gloss difference problem. PRC/1720     

气辅成型工艺的研究

介绍了气体辅助注射成型技术工艺参数的确定和成型材料的选择原则,讨论了成型过程中出现的主要缺陷及其原因和解决方法。     

动态注射成型过程中的振动技术研究

概述了注射成型过程中引入振动的基本方式，介绍了动态注射成型过程中的振动技术，以及电磁动态塑化注射成型等新技术。     

工艺参数与气肋设计对气辅注塑成型的影响

主要介绍了欠料注射量、延迟时间、气体注射压力和熔体温度等气辅注塑工艺参数及气肋截面设计对成型的影响,包括对气泡长度、抗弯曲强度、翘曲度和手指效应的影响。截面设计成矩形的制件能获得较好的气辅性能[1]。     

薄壁注塑成型中的变模温控制技术

介绍了薄壁注塑成型中存在的主要问题,阐述了变模温控制技术在薄壁注塑成型中的重要性,综述了当前各种变模温控制技术的原理及其在薄壁注塑成型中的研究与应用进展,并展望了未来薄壁注塑成型中变模温控制技术的发展趋势。