汽车方向盘座塑件热流道注塑模设计

根据汽车方向盘座塑件的材料与结构特性,模具采用热流道与多潜伏式浇口浇注系统型式,成型零件采用多块镶拼结构;为实现多方位的抽芯,外侧抽芯采用斜滑块侧向抽芯机构、内侧抽芯采用斜顶抽芯机构;采用二次推出方式实现推出,均匀布局冷却管道保证冷却效果;解决了多活动型芯及复杂抽芯机构设计问题。     

MJ1504接线壳体薄壁注塑件镶拼式侧抽芯注塑模具设计

以MJ1504接线壳体为例,分析薄壁件镶拼式侧抽芯注塑模具中的关键技术,实现了塑件成型部件工艺设计与应用。研究设计了接线壳体镶拼式侧抽芯模具的浇注系统、冷却机构、侧抽芯机构、顶出系统等相关结构,着重体现在镶拼式型芯与较复杂的开合模过程等方面,实现了模具结构的整体设计;在UG8.5Mold Wizard应用模块下设计实现MJ1504接线壳体顺利脱模。整体完成后的模具结构紧凑、工作稳定,塑件成型缺陷较小,可为该工艺的进一步推广应用提供了理论指导和技术支撑。     

内环倒扣瓶盖四面内抽芯脱模机构设计

针对某容器带内环倒扣瓶盖的注塑成型要求,设计了1模8腔点浇口三板模注塑模具。模具分5次分型,单腔中,塑件采用单点点浇口进行浇注。针对4个环形倒扣,设计了依靠模板驱动的四面内抽芯机构,实现了塑件上4个环形倒扣特征的脱模。四面内抽芯机构主要构件包括中央四面斜燕尾槽抽芯块、侧抽芯活动镶件、活动镶件架;机构依靠中央四面斜燕尾槽抽芯块的侧面燕尾槽与侧抽芯活动镶件滑动联结,用于驱动侧抽芯活动镶件内收抽芯。模具结构设计新颖,借助于四面内抽芯脱模机构设计,实现了塑件的自动化注塑生产;机构动作可靠,加工装配简单。     

同步轮塑件精密注塑模具设计

通过对同步轮塑件的结构工艺分析,设计出精密注塑模具。塑件采用一模四腔、点浇口的成型方案,模具型腔重要尺寸的计算需考虑模具制造误差、磨损误差,选择合适的模具分型面以保证塑件的形位公差,采用楔面定位结构来消除侧抽芯滑块配合间隙对侧抽芯镶块定位精度和刚度的影响,增设支撑柱和精密定位锁扣以加强模具的总体刚度和合模精度。     

基于CAD/CAE的三通水阀注塑模具设计

针对三通水阀的结构特点,运用UG设计了一套从多个方向进行侧抽芯的注塑模具。根据模拟结果和模具设计经验,合理地选择了点浇口的注塑位置,冷却系统采用"S"形冷却水路。成型机构由型芯、型腔、侧抽芯和镶块组成。通过UG注塑模块进行模具设计,可有效地缩短设计周期,节省生产成本。设计的模具结构紧凑、工作稳定,为同类型模具的设计提供了参考。     

圆弧侧孔盖注塑模具设计

分析了圆弧侧孔盖塑料件对其成型模具结构的要求,设计了两型腔、四向侧抽芯注塑模具.介绍了模具的主要结构组成、设计和工作原理.模具的斜导柱抽芯机构实现前、后侧向抽芯,斜槽块、传动销、摆杆等组合实现左、右圆弧抽芯.设计的圆弧抽芯机构比齿轮齿条式、斜导柱式等圆弧抽芯机构简单、新颖,制造方便,降低了模具的制造成本.     

差动组合抽芯的汽车后视镜支架注塑模设计

结合汽车后视镜支架的结构特点,应用UG NX设计了适用于该产品的双分型面注塑模具。应用计算机辅助工程技术分析及模具机构设计经验,选择了潜伏式浇口的浇注位置。针对难加工问题,成型零件采用镶件镶拼方式;针对脱模难问题,分别设计了不同类型的侧抽芯脱模机构,特别是同一位置的双向斜抽芯,创新性的设计了差动组合抽芯脱模机构。结果表明,模具结构设计合理,工作稳定。     

汽车灯配光镜复杂侧抽芯注塑模具设计

根据某汽车灯配光镜塑料件的功能要求与结构特性,设计了该产品的基于二次分型特点的两板式复杂侧抽芯注塑模具。模具采用一模二腔侧浇口浇注方式。在塑料件成型过程中,塑料件内侧小凹坑采用水平内侧抽芯机构脱模,倒拔模特征采用斜向内侧抽芯机构脱模,外侧卡扣等特征则采用多滑块侧抽芯机构脱模。第一次分型实现外部侧抽芯,第二次分型实现内部侧抽芯,最后由推块机构顶出塑料件,实现了顺序脱模过程。采用直接冷却内侧抽芯滑块的方式,冷却效果良好。经实践证明,该模具结构设计简单、实用,满足注塑成型工艺要求,对同类产品的模具结构设计有一定的参考意义。     

强力电锤仿生手柄注塑模具设计

针对强力电锤仿生手柄管位多、筋位多、需要大侧面抽芯脱模复杂结构的特点,经过塑料件结构分析、注塑成型工艺分析以及模具设计计算,设计了完整的三板模模具结构。模具结构主要采用3种侧抽芯机构的结构设计,包括N2螺孔特征前模T型槽抽芯机构、手柄端面特征T型槽镶件抽芯芯机构、安装台特征斜滑块上座顶针板二次脱模侧抽芯机构;通过计算与分析给出了准确的模具设计参数;通过机构创新设计,降低了模具的设计难度以及保证了机构的可靠性与经济性。经生产实践验证,模具整体结构简单,可靠性好,制作周期短,较好地满足了生产需求。     

基于UG NX的汽车音响面板注塑模设计

在汽车音响面板工艺分析的基础上,采用UG NX 10.0软件设计了一种汽车音响面板单型腔注塑模具。该模具采用了两板式结构、镶拼式型芯结构、两点进料方式、推切式潜顶针浇口、三面斜导柱抽芯以及顶针、推管和推块组成的复合顶出机构。实践证明,该模具结构合理,保证了制品质量,简化了模具结构,方便了模具成型零件加工,对类似面板的注塑模设计具有一定的借鉴意义。     

Thermal effects on stereolithography injection mold inserts

Stereolithography is a process in which a photopolymerizable resin is used to make parts. This method is used here to produce mold inserts for small injection molding runs. This paper focuses on the effects of the heat due to the injection of the polymer on these mold inserts. As the number of shots increases, the degree of cure of the insert changes. Differential Scanning Calorimetry (DSC) was used to determine the thermal property changes of the material. The evolution of the ejection forces for different post‐cure treatments was investigated. The ejection force decreased with increasing cure of the mold inserts.     

Experimental investigation and numerical simulation of injection molding with micro‐features

Injection molding of thin plates of micro sized features was studied in order to manufacture micro‐fluidic devices for bioMEMS applications. Various types of mold inserts—CNC‐machined steel, epoxy photoresist, and photolithography and electroplating produced nickel molds—were fabricated and tested in injection molding. The feature size covers a range of 5 microns to several hundred microns. Issues such as surface roughness and sidewall draft angle of the mold insert were considered. Two optically clear thermoplastics, PMMA and optical quality polycarbonate, were processed at different mold and melt temperatures, injection speeds, shot sizes, and holding pressures. It was found that the injection speed and mold temperature in injection molding greatly affect the replication accuracy of microstructures on the metal mold inserts. The UV‐LIGA produced nickel mold with positive draft angles enabled successful demolding. Numerical simulation based on the 2D software C‐MOLD was performed on two types of cavity fillings: the radial flow and the undirectional flow. The simulation and experimental data were compared, showing correct qualitative predictions but discrepancies in the flow front profile and filled depth.     

用于RTM工艺的大尺寸高精度平板压注模的设计

介绍合理选择大型高精度平板模具材料的方法,提高模具刚度的措施,以及计算平板模挠度的近似模式。     

Integrative Approaches for Mechanical Mold Design in Injection Molding

The injection mold faces a number of different loads during the injection molding process for plastic parts. The effect on the mechanical behavior of the mold, inserts, and adjacent processes can be complex and may cause bad final parts. By using an integrative simulation approach it is possible to take the process influence into account when calculating the solid body behavior of the mold in a structural simulation. A newly developed approach at IKV uses the advantages of the integrative approach and extends it by an automatic back coupling of deformation results during the filling simulation. This way the interaction of the melt flow and the deformation of inserts or mold components can be considered during the filling phase.     

摄像机镜头显示屏注塑模设计

介绍摄像机镜头显示屏注塑模的设计方法。在对该塑料件结构分析的基础上,根据塑料件制造精度设计模具的型腔数目和分流道,综合考虑成型零件的特点设计了模具结构。结果表明,该模具结构合理,可以生产出符合技术要求的摄像机镜头显示屏。     

Fabrication of wafer-level double-sided microlens array using injection compression molding

Double-sided microlens arrays (MLAs) are the key optical components of the optical component. To enhance microlens fabrication productivity, a wafer-level, double-sided MLA was designed and fabricated using injection compression molding (ICM). First, the Moldex3D simulation analysis results show that the design of the disc mold saves material and representation time than the multi-cavity mold. The 4-inch disc mold with a 4 × 4 double-sided MLA of two inserts was used to do the study. The L9 orthogonal Taguchi method was employed to find the best combination of molding parameters. For molding experiments, 2 mold inserts with 4 × 4 convex and concave lens arrays were machined by the ultraprecision diamond turning. They were mounted into molds in one of two locations, either close to the gate or far from the gate. The molding experiment results confirmed that the ICM-molded MLA was better than the injection molding (IM)-molded one, with higher precision and lower residual stress. The results were similar to the simulations. The ICM molded MLA has a focal length of 2.549 mm and a spot size of 50 μm and the total deviation percentage is less than 1%. This study proves the feasibility of fabricating a wafer-level, double-sided MLA disc using ICM.     

Flatness and microstructure of a light guide plate fabricated by microinjection molding

This study photo‐etches micropatterns on mold inserts and manufactures a light guide plate with microstructures using microinjection molding. The single parameter method is used to investigate flatness and replication with different process parameters for microinjection molding. Mold temperature is the most important factor for plate flatness and microstructure replication of a light guide plate fabricated by microinjection molding. Low mold temperature increases the flatness of light guide plates, whereas a high mold temperature improves height replication of the microstructure of light guide plates. Optimal mold temperature to maintain flatness and increase microstructure replication of light guide plates is 60°C. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers     

Hot embossing in microfabrication. Part I: Experimental

The relationship among processing conditions, material properties, and part quality in hot embossing was investigated for three optical polymers: polycarbonate (PC), polymethyl methacrylate (PMMA), and polyvinyl butyral (PVB). A series of systematic embossing experiments was conducted using mold inserts having either single or multiple feature depths. The feature dimensions varied from 90 to 3000 μm. The processing conditions studied include embossing pressure, thermal cycles, and heating methods. The displacement profile, replication accuracy and molded‐in stresses were measured experimentally. It was found that for isothermal embossing, both replication accuracy and birefringence pattern depend strongly on the processing conditions. For non‐isothermal embossing, the molded parts showed excellent replication as long as the feature transfer was completed. The flow pattern under isothermal embossing resembles a biaxial extensional flow. Under non‐isothermal embossing, the polymer deformation involves an upward flow along the wall of mold features, followed by downward compression and outward squeezing. Rheological characterization and hot embossing analysis are presented in Part II.     

某医疗器械带金属嵌件塑件的注塑模具设计

以某医疗器械带金属嵌件塑件为研究对象,运用注塑成型技术进行注塑模具设计.针对产品的多规格及系列化特点,创新设计了浇注系统,可以根据需求成型不同规格产品.通过分析塑件的结构特征,设计了组合式型芯、哈夫机构、推出机构,实现嵌件刀片的精准定位,完成塑件成型和自动脱模.将立式注塑机工作台,由一个工位改造成两个工位,既能方便地取...     

微流控芯片超声振动注射成型模具设计

针对目前微流控芯片注射成型中微通道充填困难、成型精度低等问题,研究超声振动辅助注射成型微流控芯片的方法,设计出微流控芯片超声振动模具。创新性地引入热流道系统,实现了超声振动系统与注射成型模具的有效集成;独特的流道和型腔布置实现了芯片的基片和盖片同模同时成型;改进的二次顶出机构实现了芯片的无损脱模。