带金属嵌件的塑料模具设计

分析了带金属嵌件塑料模具的结构和设计要点,介绍了两种模具结构设计方法,有效地解决了注射过程中金属嵌件准确、高效定位的难题,为类似带金属嵌件的塑件注射成型提供了参考。     

带嵌件的塑料制品注射模设计与制造

通过对基座塑料制品的工艺分析,介绍了带嵌件的塑料制品注射模设计要点和主要零部件的制造工艺。模具采用一模16腔的镶拼组合结构,嵌件设计为带料形式,提高了生产效率。     

频率自动跟踪超声波嵌件埋插机

无锡无线电厂设计制造成频率自动跟踪超声波嵌件埋插机,这是一种超声波技术与模具设计和注塑成型相结合的先进加工设备。埋插嵌件是在热塑性塑料件上的预留孔内运用超声振动产生的磨擦热使嵌件和塑料的接触而瞬时熔化,并用压力使嵌件挤入孔内,在极短的时间内使熔融的塑料凝固,从而将嵌件固定。埋插一个金属嵌件一般只需1至3秒钟,经机械性能试验,其抗拉强度大大优于原来的预埋工艺。该设备具有生产效率高、节约能源、加工质量好、成品率高、操作简单、安全可靠等优点。     

金属嵌件六角锁紧螺母及防卸螺母螺栓

金属嵌件六角锁紧螺母具有优异的双向防松性能。当螺母旋入螺栓时,嵌件紧压在螺栓螺纹面上,以抵抗使用场合中振动所产生的反向旋转力矩,从而有效防松。该产品能广泛适用于铁路内燃机车、冶金设备、振动压路机、架空运输索道等强烈振动场合,因此一直受到用     

摩擦压力机上机械化复合锻模

我厂锻工车间经常生产一些头部粗、杆部细的零件,例如螺钉、螺栓和小活门等。这些零件不适宜在模锻锤和卧式锻造机上锻造。我们将图1所示零件设计成在300t摩擦压力机上(100～160t也可以)分两个工步、两次进行模锻。由于摩擦压力机只适合单槽模锻,需要两个工步锻造的零件,要用两套模具、两火加热才能完成。不但装卸模具时间长、火耗多,而且生产效率低,零件质量差。     

基于Moldflow塑料插座底板的模流分析

以插座底板为例,应用Moldflow软件对插座底板的塑件最佳浇口位置进行分析,并进行浇注系统设计和冷却系统设计。应用Moldflow软件对插座底板进行模流分析,重点对充填、流动的整个注射过程和塑件的翘曲变形进行了分析。通过分析,找出了注射和成型过程中存在的问题以及出现的缺陷,以便于确定最佳工艺参数。采用该方法可以大大提高模具的设计效率,提高塑件的质量,缩短产品生产周期,有效地节约成本。     

圆盘卧式塑料注射成型机

本实用新型涉及一种圆盘卧式塑料注射成型机。该机包括转盘装置、对模具注射塑料流体的注塑装置和合模装置;所述注塑装置包括卧式的注塑部件：所述合模装置包括设置在圆盘上方的合模油缸和注射头,所述合模油缸活塞可作上下运动;     

挤胶缸模具设计

当橡胶件的形状比较复杂,各处厚度相差又比较悬殊,或橡胶件内有较多金属镶嵌件时,用填胶压模法成型就比较困难,此时可以采用挤胶模成型。用挤胶法生产的橡胶件组织致密,与金属嵌件结合力强,容易充满各个角落,提高了橡胶件的质量。挤胶模本体的设计与一般橡胶压模设计基本相同, 关键在于挤胶缸的设计。挤胶缸设计的方法如下。     

在整模冷镦机上采用三点式推料机构镦制大杆径比制件的试验研究

一、前言在整模冷镦机上镦制杆径比大的制件,乃是冷镦厂家和冷镦工作者们所重视和感兴趣的研究课题。目前,西德、捷克等国生产的整模冷镦机上已可镦制杆径比为L>12d的制件。作者采用双点式和三点式推料机构,在整模冷镦机上进行了镦制杆径比为20的制件的试验,取得了成功。     

试模不用注塑机

塑料模具在制造过程中,为了检验模具的结构是否合理,脱模是否方便,零件是否完整,是否达到图纸要求等等,传统的方法是将做好的模具安装在注塑机上进行试模。当遇到注塑机上的塑料牌号不同时,就得更换。没有注塑机的单位,还得和外单位协作。这种试模方法造成了人力、物力上很大的浪费,因此极需要有能满足这项工艺的试模设备,以缩短制造周期和降低成本。上海新源机械厂按上海市科委下达的任务,研制成功了Y01-1试模器。经过鉴定,已达到国外同类产品的技术水平。它能方便地应用于注射成型的     

Research on thermal stress, deformation, and fatigue lifetime of the rapid heating cycle injection mold

Rapid heating cycle molding (RHCM) is a novel plastic injection molding process. It can be used effectively to prevent many defects of products produced in conventional injection molding process. In this paper, the panel of large-size liquid crystal display TV was taken as an example. Thermal, deformation, and fatigue analysis models for RHCM injection mold were established. Firstly, by analyzing the heat transfer process of the RHCM mold, the temperature distributions on the mold cavity surface were studied. Secondly, through numerical simulation, the tendency of the stress and deformation of the RHCM mold was obtained. It showed that the fixing mode between the stationary mold insert and the stationary mold plate had a great influence on the thermal stress and deformation of the mold. As a result, a new fixing mode for the stationary mold insert was proposed which could effectively decrease the deformation caused by the temperature changing. Lastly, the lifetime of the mold under different fixing modes was evaluated, and reasonable suggestions which could improve the lifetime of RHCM mold were also proposed. Application in engineering proved that it was a very effective way to improve the lifetime of RHCM mold by using the suggested fixing mode.     

基于单片机的注塑机温控系统设计

塑料注塑成型机的诸多输入、输出参数中,料筒温度是工作过程中的重要被控参数。论文针对传统注塑机温控系统存在的超调量大、调节时间长等诸多不足,提出了以单片机为控制核心,应用模糊控制理论,设计出模糊控制器,实现注塑机温度的实时控制,对于提高注塑机温度控制精度具有较好的意义。     

A nondestructive online method for monitoring the injection molding process by collecting and analyzing machine running data

Nondestructive online monitoring of injection molding processes is of great importance. However, almost all prior research has focused on monitoring polymers in molds and damaging the molds. Injection molding machines are the most important type of equipment for producing polymeric products, and abundant information about actual polymer processing conditions can be obtained from data collected from operating machines. In this paper, we propose a nondestructive online method for monitoring injection molding processes by collecting and analyzing signals from injection molding machines. Electrical sensors installed in the injection molding machine, not in the mold, are used to collect physical signals. A multimedia timer technique and a multithread method are adopted for real-time large-capacity data collection. An algorithm automatically identifies the different stages of the molding process for signal analysis. Moreover, ultrasonic monitoring technology is integrated to measure the cavity pressures. Experimental results show that our nondestructive method can continuously monitor the injection molding process in real time and automatically identify the different stages of the molding process. The packing parameters, including the filling-to-packing switchover point and the packing time, can be optimized based on these data. Furthermore, the ultrasonic reflection coefficient and the actual cavity pressure have similar trends, and our technique for measuring the cavity pressure is accurate and effective.     

PLC在注塑机控制系统中的应用

SZ-250A型注塑机是一种中小型塑料注射成型机,它将颗粒状的塑料加热熔化到流动状,用注射装置快速、高压注入模腔,保压一定时间,冷却后成型为塑料制品。根据其工艺流程及工作控制要求,设计了以PLC为控制核心的控制系统,给出了此控制系统软硬件设计的全过程。通过实践使用证明,该控制系统具有快速、高效、高可靠性、抗干扰能力强等特点,实现了注塑机注塑全过程的自动控制。     

电控双泵液压源在注塑机上的节能研究

针对传统注塑机溢流损失严重、电力消耗大等问题,提出了一种通过控制异步伺服电机转矩和转速,以实现对注塑机输出压力和流量进行控制的方案.在该电机控制的液压动力源中,采用了串联双齿轮泵的方案,以满足大型注塑机瞬时大流量输出的要求.通过压力与流量反馈形成闭环控制,提高了输出压力与流量的控制精度,并大大提升了注塑机液压系统的节能...     

基于Ｆｌｕｅｎｔ的中间摆臂注射成型工艺参数优化

基于 ＣＦＤ计算流体力学计算软件Ｆｌｕｅｎｔ,把金属粉末注射成形过程看作空气、粉末以及粘结剂的多相流动成形过程。根据模腔注射成形的经验公式所得工艺参数设置相关边界条件并设计正交试验,对汽车发动机中间摆臂注射成形的充模过程进行三维数值模拟,基于试验结果来分析各个实验参数及其交互作用对产品质量的影响,从而为注射成形产品缺陷产生的原因提供直观分析方法,以实现 ＣＡＥ技术对实际生产的指导作用。     

注塑机合模机构及模板的优化设计

简述了我国注塑机合模机构优化设计的研究与应用，并结合本人研究课题论述了基于有限元分析的注塑机模板的优化设计。     

Optimal injection molding conditions considering the core shift for a plastic battery case with thin and deep walls

The objective of this paper is to examine the influence of injection molding parameters on the core shift to obtain the optimal injection molding conditions of a plastic battery case with thin and deep walls using numerical analyses and experiments. Unlike conventional injection molding analysis, the flexible parts of the mold were represented by 3-D tetrahedron meshes to consider the core shift in the numerical analysis. The design of experiments (DOE) was used to estimate the proper molding conditions that minimize the core shift and a dominant parameter. The results of the DOE showed that the dominant parameter is the injection pressure, and the core shift decreases when the injection pressure decreases. In addition, it was shown that the initial mold temperature and the injection time hardly affect the core shift. The results of the experiments showed that products without warpage are manufactured when the injection pressure is nearly 32 MPa. Comparing the results of the analyses with those of the experiments, optimal injection molding conditions were determined. In addition, it was shown that the core shift should be considered to simulate the injection molding process of a plastic battery case with thin and deep walls.     

液压注塑机伺服泵流量与压力解耦控制方法

介绍一种液压注塑机伺服泵流量与压力解耦的控制方法。对液压注塑机伺服系统进行建模分析,详细分析伺服泵转速与转矩、流量与压力的解耦控制,采用切换控制策略对控制方法进行优化,实现了注塑周期中不同工艺过程的良好跟踪效果和控制精度,并提高了控制响应速度。     

基于Moldflow的薄壁件翘曲变形研究

翘曲变形是注塑件的主要缺陷,利用电器后盖对薄壁成型工艺进行研究。采用Moldflow软件对塑件成型过程进行数值模拟,研究了保压压力、塑件材料对注塑件翘曲变形的影响。对薄壁注塑件的数值仿真模拟结果进行统计分析,并且对影响注塑翘曲变形量的工艺参数进行综合分析,得到最优的工艺参数组合。研究结果表明:最佳的工艺参数组合可以使得塑件翘曲量变得最小。