浅谈注塑机的控制

现代塑料注塑成型机是一个集机、电、液于一体的典型系统，由于这种设备具有成型复杂制品、后加工量少、加工的塑料种类多等特点，自问世以来，发展极为迅速，目前全世界80％以上的工程塑料制品均采用注塑成型机进行加工。     

基于以太网的注塑机远程监控系统

提出了一种利用贝加莱4PP120的以太网接口实现注塑机远程监控的解决方案，介绍了在B＆R（贝加莱）的Automation Studio编程环境中实现TCP／IP通信的方法；分析了注塑机远程监控系统应用软件的基本框架和在VC软件中实现Winsock的基本方法。     

液压注塑机停滞问题的研究和改进

通过动态测量和分析 ,查出造成液压注塑机停滞问题的原因 ,为此 ,对液压回路进行了改进。     

世纪之争—全液压式与全电动式注塑机的比较

就全液压式与全电动式注塑机的锁模系统、注射系统和整机性能的优缺点进行了比较,阐述了作者自己的观点：全电动式注塑机将主要用于中小型注射成型机生产高档精密和小型精密零件,而不同类型的全液压式注塑机用于中高档、高档精密和特别高档制品的成型;大型注塑机应开发复合两板式注塑机。     

塑料注塑机合模力检测时弹性模量的正确选取

阐述了塑料注塑机合模力测试时拉杆弹性模量的选取对测试的影响,并探讨了拉杆常用材料及材料的热处理、表面处理对弹性模量的影响,提出了比较合理的弹性模量的选取方法。     

微分注塑机的研制

系统地介绍了微型注塑机注塑单元的结构形式,分析了各种注塑单元的特点;研制了一种基于精密齿轮泵的微分注塑机,详细地阐述了微分注射成型的机理,对比了微注射成型和微分注射成型的基本工艺流程;通过试验初步检验了微分注射成型效果。结果表明,微分注射成型可高效率地成型微型制品。     

低压注塑机远程监控系统设计

为了提升注塑生产的自动化程度,提高低压注塑机的生产效率,以及实现对注塑机数据的有效监控,设计了一套基于可编程控制器(PLC)的低压注塑机远程监控系统。采用PLC对低压注塑机现场数据进行实时采集,再通过触摸屏接收PLC传送的数据,并对数据进行实时处理,同时结合触摸屏完成数据显示、控制决策下达、配方生成等功能。在完成低压注塑机控制系统数据采集的基础上,通过数据传输单元完成控制系统无线数据的传送,从而构建了一套可行性高、操作方便的综合性远程监控系统。该远程监控系统为低压注塑机安全稳定运行提供了安全保障,提高了塑料制品注塑的自动化程度。     

卧式注塑机全自动送料系统的设计与实现

设计了卧式注塑机全自动送料系统,该系统可自动送料带和剪切料带,将料片送到注塑机中进行注塑并取出成品。给出了该系统的机械结构和气动系统设计,控制部分采用Siemens 226 PLC实现。     

基于ARM平台与NB-IoT技术的注塑机远程监控系统研究

针对注塑机行业对于温度监控提出的需求,设计了一种基于ARM平台和NB-IoT技术的监控系统方案。该监控平台硬件以STM32F767开发板为控制核心,使用NB-IoT技术实现监控平台与现场传感器数据的传输,并使用C#语言编程界面显示控制部分,实现远程对注塑机性能控制的物联网监控平台。结果表明:该系统可以满足注塑机生产过程中对温度参数的监控,具有实时性好、交互信息丰富、通用性强及软硬件易升级等优点,对于注塑机监控平台的研究具有重要的指导意义。     

啤酒灌装压盖机监控系统的研究与改进

近年来,我国的啤酒需求量日趋增长,随着啤酒生产规模的不断扩大,过程参数和控制回路逐渐增多,对企业的综合信息管理,生产过程的自动化控制提出了更高的要求,使得目前生产线采用人工巡视各个控制点的情况,发现问题再加以手工调节的方式远远不能满足啤酒生产规模日益增大,灌装质量、灌装精度日益提高的要求,因此开发啤酒灌装生产线的自动监控系统显得尤为重要.本文介绍监控系统的改进设计,意在为啤酒自动化灌装生产线减少开发费用、缩短系统开发周期,提高灌装操作人员的反应速度,更加有效、可靠地起到监测管理、安全生产、预防事故发生的目的.     

基于PC的注塑机控制系统

文章介绍了开放式控制系统的概念和TWinCAT技术——一种基于PC的实时控制技术。文章对于如何在基于PC的平台上实现注塑机的温度控制进行了探讨。     

Cavity balance for plastic injection molding

Cavity balancing is the process of altering the flow front within a cavity through thickness and design changes such that a desired fill pattern is achieved. This paper reports the preliminary research undertaken in developing an automated method for cavity balancing of two‐dimensional cavities. The aim of the automated cavity balancing routine is to reduce product development time and to improve product quality. This will lower the level of prerequisite expert knowledge necessary for successful mold and part design. The automated cavity balancing routine has been developed using the concept of flow paths. The hill‐climbing algorithm was employed on the cavity fill pattern for generation of the flow paths. Replacing the flow paths generated using the straight flow path assumption in previous work, this method was found to be more versatile and suitable to automation. No special considerations or routines were required to overcome the presence of inserts within the cavity. The method has been implemented in a computer program running as an external loop to the Moldflow software. The models analyzed demonstrate that the proposed method is viable and robust.     

Optimal cooling system design for the injection molding process

A computer-aided optimal design system was developed to improve the performance of a cooling system for injection molding. This was done by minimizing a weighted combination of the uniformity of the part temperature and the cooling time. The CONMIN algorithm was adopted to obtain the optimal design using the special boundary integral formulation and a corresponding design sensitivity analysis formulation. Design variables related to the processing conditions (i.e., inlet coolant temperature and volumetric flow rate of each cooling channel) and mold cooling system design (radius and location of each cooling channel) were considered. Three different optimization strategies are suggested, and three sample problems were solved to demonstrate the efficiency and the usefulness of this optimization procedure.     

浇注型连帮聚氨酯微孔鞋底的研制

以真皮为主作鞋帮面，聚氨酯微孔底作内底，外底，采用常压连帮浇注成型工艺研制浇注连帮聚氨酯微孔底旅游鞋。对配方，工艺路线及工艺参数控制进行了分析，对比，确定。结合生产实践，分析了生产过程中影响产品质量的主要因素及采取的措施。     

Optical monitoring of polypropylene injection molding

We have constructed an optical fiber sensor for monitoring injection molding and we have developed a model to describe sensor behavior. The sensor consists of a sapphire window at the end of a sleeved ejector pin into which an optical fiber is inserted. The optical view with this sensor is through the thickness of the molded product. The measured optical signal was light that transmitted through the resin, reflected off the back wall of the mold, and retraced its path through the resin to the optical sensor, i.e., light transmitted through twice the thickness of the resin. While monitoring polypropylene during the packing and cooling phase of the molding cycle, we observed a decrease in light intensity due to scattering of light by the growing microcrystals. A characteristic minimum in the transmitted light intensity versus time curve is attributed to scattering by growing crystalling spherulites at the core of the molded product. Cavity pressure was also measured and was found to be an essential parameter in the process model. The model illustrates how temperature, pressure, and crystallinity affect the detected light intensity and clarifies the roles that temperature and pressure play in the crystallization process.     

Optical monitoring of polyesters injection molding

An optical fiber sensor similar to the one developed by Thomas and Bur 1 was constructed for the monitoring of the crystallization of three polyesters during the injection molding process. The polyesters studied were: polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), and polyethylene terephthalate (PET). With this optical system it was possible to obtain, in real time, some essential parameters of the polyester crystallization kinetics at different processing conditions. Thus, a study of the influence of injection molding variables on the nonisothermal crystallization kinetics of these polyesters was done. The processing variables were: mold wall and injection temperatures, T_w and T_i, respectively; flow rate, Q; and holding pressure, P_h. The experiments were done following a first order central composite design statistical analysis. The morphology of the samples was analyzed by polarized light optical microscopy, PLOM. The signal of the laser beam during the filling and the crystallization stages of the injection molding of these materials was found to be reproducible. The measurements showed that this system was sensitive to variations of the crystallization of different types of polymers under different processing conditions. The system was not able, however, to monitor the crystallization process when the crystallinity degree developed by the sample was very low, as in the PET resin. It was also observed that T_w and T_i were the most influential variables on the crystallization kinetics of PBT and PTT. Due to its slower crystallization kinetics, PTT was found to be more sensitive to changes in these parameters than the PBT. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 563–579, 2006     

In-line optical monitoring of polymer injection molding

An optical sensor, consisting of optical fibers to transmit light to and from the mold cavity, was constructed for the purpose of measuring the onset of polymer solidification during injection molding. The sensor was used to detect characteristic fluorescence radiation from a dye which had been doped into the resin at very low concentration. By measuring changes in fluorescence intensity it was possible to detect whether the state of the resin was liquid or solid. We observed that, as the resin cooled in the mold, the onset of solidification was indicated by highly characteristic and distinct changes in the fluorescence intensity/time profile. Application of the method involved the use of a calibration relationship between the fluorescence intensity and temperature of the doped polymer in order to determine the distict features which characterize the onset of solidification. Injection molding of a glass forming polymer (polystyrene) and a crystallizable polymer (polyethylene) was monitored by this technique.     

塑料制品注塑成型缺陷的成因分析

通过列举几种注塑成型过程中最为典型的几种缺陷,结合生产实际,从影响注塑成型制品质量的因素(产生的物理原因、注塑模具和制品结构、注塑工艺参数有关的原因、塑料材料)着手,分析了归纳注塑成型制品典型质量缺陷产生的原因,并提出了克服缺陷的具体改良措施。     

On-line ultrasonic monitoring of the injection molding process

On-line ultrasonic monitoring of injection molding of a simple polymer box is studied using pulse-echo techniques. The flow front of molten polymers inside the mold has been probed by a multiple-channel probing system with a time resolution of 2 ms. This information can be used to control the plunger movements. The gap development, because of the shrinkage of the part in the mold, is also monitored. This information, which is important for the understanding of the part's cooling process, has been found to be superior than that measured by a conventional pressure probe. The relation between the gap formation time and the packing pressure has been investigated at various part locations characterized by different thicknesses. The velocity and the amplitude variations of ultrasonic waves, in a reflection as well as in a transmission configuration, have also been measured in the part's material during its solidification. The behavior of these ultrasonic parameters contributes to the interpretation of the solidification process.