关于注射BMC成型中的粘度控制问题

在主射ＢＭＣ成型中，ＢＭＣ料粘度的变化影响工艺过程及制品质量。本文讨论了在预塑及注射成型中粘度变化的规律，预塑时间是衡量ＢＭＣ料状态及组份是合适的重要标志。制品上的暗色波纹是由高速摩擦热引起的，注射中的ＢＭＣ料团的表征粘度跟剪切速率成反比，文中所示流线状态较好的反映了ＢＭＣ料在模腔中的流动状态。     

注塑制品常见的质量缺陷分析

本文从影响注射成型制品质量的三大因素（塑料材料、注射成型工艺、注射模具）着手，分析常见的注射成型制品的质量缺陷产生的原因和克服缺陷的具体措施。     

复合材料成型新技术—RTM及其在汽车工业中的应用

本文简要地介绍了ＲＴＭ成型工艺，通过对手糊和ＳＭＣ工艺的比较，论述了其特点及ＲＴＭ制品在汽车工业中的应用。     

聚氨酯反应注射成型充模流动研究

聚氨酯原料体系反应注射成型（ＲＩＭ）制品在汽车构件、商用机器外壳等制造方面得到越业越广泛的应用，同时ＲＩＭ制品也朝着体积大、注射速度快的方向发展。但目前在模具设计及工艺参数选择中仍采用经验或尝试的方法，耗费大量人力物力。为此，本文对长扁平板模聚氨酯反应注射成型（ＲＩＭ）充模流动过程进行了实验研究并建立了计算模型。得出的压力计算公式与实验结果进行了对比。结果表明在弃模时间ｔｆ远小于凝胶时间ｔｑｍ时充     

陶瓷注射成型有机载体的选择及相容性研究

对数种陶瓷注射成型常用的有机载体，通过ＤＳＣ，ＳＥＭ，溶度参数计算和高温金相显微镜观察，定性和定量地研究了有机载体之间的相容性及它们与Ｓｉ３Ｎ４粉体的润湿性，在此基础上的考察了配方不同的注射成型混合物料的流变特性，确定了适于陶瓷注射成型的有机载体。     

增强反应注射成型聚氨酯及其性能研究

以反应注射成型聚氨酯（ＲＩＭ－ＰＵ）为基体树脂，研制了以玻纤增强剂的增强反应注射成型聚氨酯（ＲＲＩＭ－ＰＵ）材料。讨论了原材料及玻纤对ＲＲＩＭ－ＰＵ加工工艺及材料性能的影响。结果表明，以碳化二亚胺改性的异氰酸酯（ＣＭ－ＭＤＩ）和低聚合异氰酸酯改性的异氰酸酯（ＰＡＰＩ）混合物与丙腈－－苯乙烯接枝改性环氧乙烷封端的聚醚二元醇（ＡＰＧ）为主要原料，玻纤长度不大于１．５时，不仅ＲＲＩＭ加工工艺性好，而且Ｒ     

结构反应注射成型(SRIM)—─PU-PI增强塑料的研制及性能研究

在研究结构反应注射成型（ＳＲＩＭ）化学体系的基础上，以玻璃纤维毡片为增强剂，预先配制在模具中，然后进行反应注射成型的新技术－ＳＲＩＭ技术，研究制备了氨酯改性聚异氰脲酸酯（ＰＵ－ＰＩ）增强塑料（ＳＲＩＭＰＵ－ＰＩ）。     

树脂传递模塑成型用高性能双马来酰亚胺改性树脂基体的研究

本文以烯丙基对甲酚醚（ＡＭＰＥ），作为双马来酰亚胺（ＢＭＩ）／二烯丙基双酚Ａ（ＤＡＢＰＡ）树脂体系的活性稀释剂，获得了适合树脂树脂传递成型（ＲＴＭ）工艺的三元共聚树脂体系。通过对该树脂体系及其固化物的粘度－温度－时间曲线，凝胶化特性、ＤＳＣ（微分扫描式量热）ＩＲ（红外光谱）、ＳＥＭ（电子显微镜扫描）和力学性能测试，表明该体系在ＲＴＭ成型 中，注射温度可取７０℃，该温度下，粘度仅０．３Ｐａ．ｓ，贮存     

浅述BMC注射成型技术

介绍ＢＭＣ注射成型技术的特点与原理，讨论了ＢＭＣ注射成型设备的性能特点及工艺条件，并分析了ＢＭＣ注射制件常见的缺陷及其原因等。     

碳化硅陶瓷的热等静压烧结

系统地研究了不同添加剂（如Ａｌ２Ｏ３，ＡｌＮ和Ｂ４Ｃ等）在热等静压（ＨＩＰ）烧结条件下对ＳｉＣ陶瓷之致密机理，显微结构以及力学性能的影响，结果表明：在ＨＩＰ烧结过程中，Ａｌ２Ｏ３可以与ＳｉＣ颗粒表面的ＳｉＯ２生成低共熔的铝硅酸盐玻璃相，并有效地促进ＳｉＣ陶瓷的致密化，当添加３％（以质量计）Ａｌ２Ｏ３时，采用ＨＩＰ烧结工艺，在１８５０℃温度和２００ＭＰａ压力下降结１ｈ，就可获得相对密度和抗弯强度分别     

注射成型中的纤维取向

阐述了短纤维增强复合材料在注射成犁中纤维的取向问题。并用MOLDFLOW软件对具体注塑制品的纤维取向进行了模拟．对影响纤维取向的主要工艺参数(速度、压力、温度)进行了必要的分析。     

Development of a 3D‐Finite Element Module for the Prediction of the Fibre Orientation in Injection Moulded Parts

This article presents a 3D‐finite element simulation package for the prediction of the fibre orientation in injection moulding. The fibre orientation is calculated by using a mathematical model based on orientation tensors, which not only takes into account the 3D‐flow field, but also the shape of the fibres and the fibre‐fibre interaction. The tensor model has been verified in many scientific investigations and has proven to yield satisfying results. Therefore we decided to use this model for implementation into a 3D‐finite element simulation package, which is currently being developed at the Institute of Plastics Processing (IKV) at RWTH Aachen University, Germany. The implementation of this model using both the finite element method and the finite volume method is described and the different parameters used in this model are analysed and discussed separately, as are the parameters used for the injection moulding process. The results obtained are compared to similar results from literature.

Model of the flow channel (10 mm × 10 mm × 100 mm) used for the simulations.     

注射成型技术进展

介绍了注射成型机、注射成型工艺的一些新进展，重点介绍了电动式注射成型机、预柱塞式注射成型机、往复式成型机、专用成型机等一些新式注射成型机；同时介绍了超高速注射成型、薄壁注射成型、复合注射成型工艺的特点。     

注射压塑成型工艺

注射压塑成型是在加工压注塑基础上发展的一种先进加工技术,其特点是：可获得较高的流动距熟／壁厚之比,可降低夹昆力和注射压力,加工过程中材料应力较低,有利于模制大型零件。     

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。     

The enhancement of the mechanical properties of a high-density polyethylene

This paper describes the process optimization in injection molding of high-density polyethylene (HDPE). Both conventional injection molding and shear controlled orientation (SCORIM) were employed in processing. The process optimization was based on design of experiments and complemented with analysis of variance. Mechanical characterization was carried out by tensile testing. Wide-angle X-ray diffraction and differential scanning calorimetry were used for the structural characterization of the moldings. High-density polyethylene exhibits 7.2 GPa Young's modulus and 155 MPa of ultimate tensile strength following the application of SCORIM processing. These results account for a fourfold increase in Young's modulus and a fivefold increase in ultimate tensile strength compared to conventional injection molding. The maintenance of toughness while enhancing stiffness and strength of the SCORIM moldings is attributable to an oriented morphology developed during shear flow, i.e., shish-kebab structure. The frequency of shearing action has the strongest influence on the morphology development. It is also demonstrated that the studied parameters are very much interdependent. It is possible to achieve substantial gains in mechanical properties of HDPE in SCORIM processing without causing a substantial increase in cycle time. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2473–2483, 1999     

Morphology−performance relationship of polypropylene−nanoclay composites processed by shear controlled injection moulding

A nanoclay based masterbatch was mixed with polypropylene (PP) and injection moulded by conventional (CIM) and shear controlled orientation (SCORIM) injection moulding techniques. The aim was to correlate the morphologies induced by SCORIM and CIM processing with the thermal, mechanical and fracture performance of thick PP/nanoclay mouldings. In SCORIM, two extreme shear levels were applied by changing processing conditions. A complete characterization is reported, and statistical analysis was carried out to obtain a relationship between moulding properties. Nanoclay acted as a polymer morphology director, and in combination with SCORIM it induced the formation of the γ polymorph of PP. The nanoclay has a strong positive effect on the thermal degradation of PP under an oxidative atmosphere, due to the barrier effect of clay and the physico‐chemical adsorption of volatile degradation products on the silicates, but there were no differences between processing techniques. SCORIM samples of neat PP showed nonlinear brittle behaviour, while nanocomposites exhibited quasi‐stable behaviour induced by a large deformation capability of the skin. Although fracture initiates at practically the same loading levels, the overall propagation energy values varied with processing conditions. Statistical analysis indicates that the decrement of the core region achieved by SCORIM processing, the differences between skin and core and the PP γ phase induced by the presence of nanoclay are responsible for the toughening of SCORIM PP/nanoclay mouldings. © 2013 Society of Chemical Industry     

变频器在注塑机调速系统中的节能分析及应用

运用变频器对注塑机进行节能改造设计,采用比例流量、比例压力信号动态控制变频器的输出频率,从而控制油泵电机的转速,实现变压节能。设计了变频器外部接口电路,进行了变频器参数设定和机电联调。经改造的注塑机系统的精度和稳定性极大提高,操作方便,节能效果明显,产生了显著的经济效益和社会效益。     

Structure development and interfacial interactions in high‐density polyethylene/hydroxyapatite (HDPE/HA) composites molded with preferred orientation

Composites of high‐density polyethylene (HDPE) filled with sintered and nonsintered hydroxyapatite (HA) powders, designated as HAs and HAns, respectively, were compounded by twin screw extrusion. Compounds with neoalkoxy titanate or zirconate coupling agents were also produced to improve interfacial interaction and filler dispersion in the composites. The composites were molded into tensile test bars using (i) conventional injection molding and (ii) shear‐controlled orientation in injection molding (SCORIM). This latter molding technique was used to deliberately induce a strong anisotropic character to the composites. The mechanical characterization included tensile testing and microhardness measurements. The morphology of the moldings was studied by both polarized light microscopy and scanning electron microscopy, and the structure developed was assessed by wide‐angle X‐ray diffraction. The reinforcing effect of HA particles was found to depend on the molding technique employed. The higher mechanical performance of SCORIM processed composites results from the much higher orientation of the matrix and, to a lesser extent, from the superior degree of filler dispersion compared with conventional moldings. The strong anisotropy of the SCORIM moldings is associated with a clear laminated morphology developed during shear application stage. The titanate and the zirconate coupling agents caused significant variations in the tensile test behavior, but their influence was strongly dependent on the molding technique employed. The application of shear associated with the use of coupling agents promotes the disruption of the HA agglomerates and improves mechanical performance. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2873–2886, 2002     

注射成型过程中非牛顿塑料熔体的流变特性

在探讨塑料熔体粘度模型的基础上，根据塑料熔体在注射成型过程中的流动特点，讨论了一种能够在加工温度和压力条件下，剪切速率在l0～10^3s^-1的变化范围内，相当精确地描述高聚物流变特性的拈度模型。重点讨论了模型的参数拟合和适用范围，为注射模具设计和成型模拟提供了科学依据。