咖啡壶手柄气辅注射成型模具设计

咖啡壶手柄．由于存在非常大的壁厚差异,且结构形状相当复杂,采用普通注塑工艺难以成型,必须采用气辅注射成型工艺。本文根据产品的结构特点．采用气辅注射成型工艺并设计其模具．在实际生产应用中．取得良好的结果。     

按键双物料注射成型的模具设计

字符按键,采用双物料注射成型工艺成型,由于字符中存在封闭回圈,必须将塑件结构与模具结构相配合,才能使熔融塑料填充到字符嵌件中成型。本文阐述了该成型工艺的模具设计,实际应用证明该模具符合产品生产的要求。     

PPS注射成型工艺及模具设计

阐述了ＰＰＳ（聚苯硫醚）的特性及其注射成型工艺要求,并以副底板零件模具为例,介绍了注射模具结构的设计。     

PPS注射成型工艺及模具设计

阐述了ＰＰＳ（聚苯硫醚） 的特性及其注射成型工艺要求, 并以副底板零件模具为例,介绍了注射模具结构的设计。     

手机保护壳塑料模具设计

注射模具在注射制品成型中起着极其重要的作用,除了塑料制品的表面质量、成型精度完全由模具决定之外,塑料制品的内在质量、成型效率也受模具左右,所以如何高质量、简明、快捷、规范化地设计注塑模具,成为发挥注射成型工艺的优越性、扩大注射制品产量的首要问题。     

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。     

模板法注射成型纳米结构及其疏水特性

以不同形貌和深宽比的阳极氧化铝(AAO)模板为模芯,采用注射成型方法制备了纳米结构,分析了纳注射成型的模具温度、制件的疏水特性和模芯的使用寿命。首先,通过对比3种AAO模板的结构特征和深宽比,研究了不同模具温度下纳米结构的复制质量。然后,针对纳米阵列结构的疏水特性,分析几何结构特征与模具温度对制件静态接触角的影响,探索PC制件不同成型区域内的疏水性能。最后,对AAO模板的宏/微观质量和使用寿命进行了分析。研究结果表明:模具温度对纳米结构复制质量影响显著,且主要体现在纳米结构的成型高度上;纳注射成型制件不同区域内的疏水特性略有差异,最大静态接触角可达108.2°,比平板制件提高了31.5%;500余次的注射成型后,低深宽比的AAO模板整体质量良好,而高深宽比的模板缺陷明显,使用寿命有限。     

水介质单体液压支柱Y型密封圈的CAE优化分析

介绍了水介质单体液压支柱采用的密封元件———Y型密封圈的结构与成型;针对注射成型过程中Y型密封圈出现的主要成型缺陷———缩痕,分析了其产生的原因,提出了解决措施;运用Moldflow对Y型密封圈的注射成型过程进行CAE分析;从改进注射成型工艺参数和模具结构2个方面着手,提出3种优化方案进行CAE优化分析,并将所得之最优方案付诸于实际成型过程。依据最优方案成型的Y型密封圈其缺陷得以消除,符合水介质单体液压支柱对密封元件的要求。     

基于Taguchi试验设计的储箱箱盖注射工艺参数研究

注射成型受众多因素影响,在制件结构和模具结构确定的条件下,通过合理的注射工艺参数,可消除或减少塑件成型中出现的缺陷。针对某企业在试生产一种储物箱箱盖时产生翘曲变形的问题,采用Taguchi试验方法,应用Moldflow对注射过程进行模拟,获得了塑件在熔料温度、模具温度、注射时间和保压压力四因素三水平下成型的翘曲变形量。采用极差分析,比较了不同工艺参数对翘曲变形量的影响程度,得到了优化的工艺参数组合。经试验验证,其效果良好,产品的翘曲变形得到了一定的改善。     

后盖注塑模设计

本文针对儿童玩具手机的后盖设计了其注塑成型的注塑模具结构。该制件结构简单,存在矩形孔和圆形孔、倒扣,因此设计了圆形推杆和推管两种推出机构,以及用斜顶侧抽芯机构。采用一模两腔的型腔布局形式,在XS-ZY-125的注射机上一次注塑成型。     

Integrated simulation of the injection molding process with stereolithography molds

Functional parts are needed for design verification testing, field trials, customer evaluation, and production planning. By eliminating multiple steps, the creation of the injection mold directly by a rapid prototyping (RP) process holds the best promise of reducing the time and cost needed to mold low-volume quantities of parts. The potential of this integration of injection molding with RP has been demonstrated many times. What is missing is the fundamental understanding of how the modifications to the mold material and RP manufacturing process impact both the mold design and the injection molding process. In addition, numerical simulation techniques have now become helpful tools of mold designers and process engineers for traditional injection molding. But all current simulation packages for conventional injection molding are no longer applicable to this new type of injection molds, mainly because the property of the mold material changes greatly. In this paper, an integrated approach to accomplish a numerical simulation of injection molding into rapid-prototyped molds is established and a corresponding simulation system is developed. Comparisons with experimental results are employed for verification, which show that the present scheme is well suited to handle RP fabricated stereolithography (SL) molds.     

Injection molding of polymer micro- and sub-micron structures with high-aspect ratios

This work studies the injection molding characteristics of polymer micro- and sub-micron structures using demonstration mold inserts with micro- and sub-micron channels with high-aspect ratios. The effects of the injection molding parameters on the achievable aspect ratio of the micro- and sub-micron walls were investigated. Additionally, distinctive mold-filling behaviors and resulting defects were observed for various polymers, such as polymethyl methacrylate (PMMA), polypropylene (PP) and high-density polyethylene (HDPE). Experimental results reveal that the mold temperature determines the success of the injection molding of micro- and sub-micron walls. The satisfactory mold temperature for micro-injection molding significantly exceeds that for traditional injection molding. Moreover, the main injection pressure and the main injection time substantially affect the achievable aspect ratio of the micro- and sub-micron walls. Furthermore, unusual flow behaviors occur and poor molding results are obtained when PP and HDPE are used for micro-injection molding.     

薄壁塑件注塑成形特性的试验研究

设计制造了一可成形薄壁塑件的模具,利用正交试验方法(田口方法)进行充模试验,研究各工艺参数(注射速度、注射压力、熔体温度、注射量和模具温度等)对薄壁塑件注塑成形充模过程的影响。研究结果表明:模具温度对薄壁塑件的填充起决定性作用,注射压力和注射量是影响薄壁塑件成形的重要工艺参数,注射速度与熔体温度之间的交互作用对薄壁塑件成形的影响显著。     

齿轮齿条斜抽芯机构注塑模设计

根椐塑料垫的结构特点,设计了由对称布置在模具内部的四组齿轮齿条斜抽芯机构、推杆推出机构等主要部分组成的四型腔单分型面注塑模。介绍了注塑模主要零件的结构设计,注塑机的选择,模具的校核和工作原理。设计的模具结构紧凑、合理,工作可靠。     

CAE技术在注塑成型浇注系统优化设计中的应用

注塑模浇注系统是塑料注塑成型模具设计中的关键技术之一,利用CAE软件Moldflow可对不同浇口位置进行流动模拟分析,预测可能存在的气泡和熔接痕的位置,为模具设计人员优化模具设计提供依据,提高一次试模的成功率。并经过实践证明,注塑成型中通过浇注系统位置的优化可以显著提高产品的质量。     

注塑件特征建模及塑件智能尺寸换算

探采用基于特性和知识相结合的技术，建立注塑件产品模型，实现注塑件尺寸到成形零部件尺寸的智能转换，为建立注塑模型腔型芯模型打下基础，并以ＵＧＩＩＶ９．０为支撑软件，用其Ｍａｃｒｏ及二次开发语言Ｇｒｉｐ实现。     

注射成型模具维修工艺探究

为了提高注射成型模具的维修水平,对维修工艺做了深入的探索,阐述了模具在使用过程中的损坏情况,讨论了维修工艺规程的编制,分析了编制数控设备加工的程序,研究了零件维修的加工方法和维修过程中的检验,并探讨了注射成型模具的维护、保养及报废问题。     

基于Moldflow的魔方中心轴注射分析与优化设计

应用Moldflow软件对魔方中心轴的注射成型过程进行浇口位置、充填、冷却和翘曲等模拟分析。通过在不同注射工艺条件下进行对比分析,确定了注射的最佳工艺参数:充填时间为2 s,注射+冷却时间为8 s,模具温度为40℃,熔体温度为240℃,注射压力为100 MPa。应用UG软件建立了注射模具的实体模型,解决了传统注射模具设计方法存在设计周期长、成本高且质量难以保证等问题。     

变模温注塑热响应模拟与模具结构优化

变模温注塑可根据不同工艺阶段的特点和要求,随时调整模具温度。在塑料熔体充模过程中,如果模具表面温度保持在塑料玻璃化转变温度以上,可以彻底解决常规注塑工艺存在的熔接痕、喷射痕、流动痕、翘曲和浮纤等缺陷。同时在冷却阶段,通过快速冷却已赋形的塑料熔体,以减小注塑成型周期。从而在不影响注塑生产效率的基础上,提升注塑件的品质。基于这种思想,在深入研究变模温注塑工艺原理的基础上,提出一套新的利用蒸汽辅助加热的模具温度控制方法,制定其工艺流程,并构建相应的动态模温控制装置和系统。通过研究蒸汽辅助加热变模温注塑模具的结构特点,提出了4种不同的模具设计方案,利用有限元软件ANSYS构建了变模温注塑模具传热分析模型,分别对变模温注塑工艺的加热、冷却过程进行温度响应模拟。以减小成型周期和提高温度均匀性为目标,对模具设计方案进行优化分析。将模拟分析获得的结果应用于平板电视机面板的注塑生产,验证分析结果的有效性。     

Integrated numerical analysis to evaluate replication characteristics of micro channels in a locally heated mold by selective induction

High-frequency induction heating is an efficient way to heat mold surfaces by electromagnetic induction using a non-contact procedure. Due to its ability to rapidly heat and cool mold surfaces, this method has been applied recently to the injection molding of micro/nano structures. The present study investigates a localized heating method involving the selective use of mold materials to enhance the heating efficiency of high-frequency induction heating. A composite injection mold consisting of ferromagnetic material and paramagnetic material was used for localized induction heating. The feasibility of this localized heating method was investigated through numerical analyses in terms of its heating efficiency for localized mold surfaces and the resulting flow characteristics in micro channels. To take into account the effects of thermal boundary conditions of localized induction heating, a fully integrated numerical analysis effectively connecting electromagnetic field calculation, heat transfer analysis, and injection molding simulation was carried out. The proposed integrated simulation was applied to the injection molding of a rectangular strip containing micro channels, and the resulting mold heating capacity and replication characteristics of the micro channels were compared with experimental findings in order to verify the validity of the proposed simulation.