塑料挤出吹塑成型工艺研究进展

1概述 挤出吹塑是塑料中空制件生产的主要成型方法之一,适于PE、PP、PVC、热塑性工程塑料、热塑性弹性体等聚合物及各种共混物,主要用于成型包装容器,储存罐与大桶,还可成型用于汽车工业等工业制件。挤出吹塑成型跟其他的塑料中空成型一样,其主要优点是生产的产品成本低,工艺简单,效益高,但其突出缺点是制品壁厚尺寸及均匀性不易控制。     

输液瓶吹塑成型过程模拟与模具设计研究

针对输液瓶吹塑成型过程厚度不均的问题,对其吹塑成型过程进行了计算机模拟研究,建立了几何二维模型,导入ANSYSWORKBENCH软件,创建了模拟任务,利用网格重置技术,获得了输液瓶吹塑成型过程厚度变化规律,并对输液瓶吹塑成型过程进行了分析;同时结合吹塑工艺,提出输液瓶吹塑模具设计方案,进行输液瓶模具设计。研究结果表明:过程模拟获得了吹塑过程中厚度变化规律、吹胀压力对壁厚的影响,厚度变化范围为0.796 mm~2.904 mm,吹胀结束后最大厚度比为3.648:1,压力变化范围为0.798 Mp~0.801 Mp,吹胀结束后压力大小为0.799 Mp,对产品生产过程中壁厚控制有一定指导作用;采用Uni Graphics三维软件进行模具设计,提高了设计效率及精度。     

塑料瓶吹塑模型腔加工研究分析

本文针对塑料瓶这类吹塑模具的特点,对其加工工艺、加工方法进行了详细分析和论述;结合数控编程软件UG,详细地阐述了这类模具数控加工的编程思路和方法,以满足相关生产厂家的需要,使生产质量、生产效率得到提高.     

挤出吹塑机的优势

多年来，挤出吹塑机一直交替采用的是气动和液压驱动方式，然而现在已改为纯电动驱动。这对于用户来说则意味着省电和节省占地面积。与气动和液压缸驱动相比，全电动还具有其他的优点，例如在非均匀荷载和停车自动制动的情况下，     

塑料挤吹型胚控制器的设计

分析了目前对塑料制品的需求增加,塑料制品结构多样化等现状,提出了具有壁厚控制功能的吹塑成型控制器.并分别从软件系统和硬件系统角度出发,对挤吹成型控制器进行了设计,实现了挤吹成型"高可靠性、高适应性、高效率"的要求.     

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 But all current simulation packages for conventional injection molding are no longer applicable to this new type of injection molds, mainly because the property of the mold material changes greatly.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.     

CFRP汽车顶盖模压模具加热管道优化设计

针对模具加热管道的设计影响温度分布及加热效率,从而影响制件质量的问题,以CFRP汽车顶盖模压模具为例,对其加热管道进行优化设计。根据汽车顶盖形状特点,将加热管道直形排布改为随形排布,近似分布在两条折线上。改变折线上关键管道纵坐标以带动折线变化,从而改变其余管道位置,得到不同的加热效果。通过MATLAB软件与ANSYS软件联合仿真,得到加热管道位置与相应温度分布数据,并基于响应面法优化得到加热管道位置。通过仿真验证,预浸料的加热效果较初始设计得到明显改善。     

注塑工艺设计中模具CAE技术与正交试验的综合应用

模具CAE技术与正交实验、数据处理与分析技术的综合应用,可以有效地优化工艺参数方案,缩短模具设计周期、提高模具设计质量、降低模具制造成本。本文为注塑成型工艺方案的优化及模具设计提供了一种可行方案和技术路线。     

面向航天器管路焊装过程的集成制造技术

为了提高航天器的可靠性,结合航天器中管路研制的工程实践提出一种面向航天器管路焊装过程的集成制造方法。给出面向航天器管路焊装过程的集成制造方法的总体技术路线,建立了该集成方法的应用业务流程,重点对焊装过程数据集成管理、可制造性智能评价、导管数控弯制过程仿真、管路模型比对和管路的数字化柔性焊装五个关键技术进行了阐述。设计并开发了面向航天器管路焊装过程的集成制造系统,并进行了实例验证。通过应用数字化手段对管路制造全过程进行分析校验和集成信息管理,实现了航天器管路制造从传统的手工模式向全过程数字化制造模式的转变。     

发动机增压管降噪结构优化设计

增压管是发动机增压系统中的核心部件.以某发动机增压管为设计分析对象,综合采用了声学分析、流场分析和模态分析等仿真计算方法,对增压管结构进行了优化设计,并提出了具体的降噪结构设计方案.通过优化分析,流道结构降噪指定频域段达到了设计要求,而空气的总压力损失为2.577 kPa,增压管的前三阶固有频率都大于205 Hz,均满足增压管的设计指标要求.     

正交试验设计的注塑成型工艺参数多目标优化设计

结合正交试验设计和注塑成型模拟软件Moldflow,对不同工艺条件下的注塑成型过程进行模拟分析,并运用模糊数学中的综合评判法,对塑件成型后的体积收缩率变化、表面缩痕指数和最大翘曲变形量三个目标值进行综合评判,得到综合评分.通过对综合评分的极差分析,确定模具温度、熔体温度、注塑时间、保压参数、冷却时间等工艺参数对综合评分的影响程度,并绘制因素水平影响趋势图,分析得出最优的注塑工艺参数组合方案,并对该工艺组合方案进行模拟验证.     

螺旋管成形设备与成形工艺分析

介绍了小直径螺旋管成形设备，分析了绕制螺旋管的最小弯曲半径。通过几种成形工艺过程的比较，指出采用螺旋槽心轴以及支架可偏转压紧轮成形设备绕制螺旋管，螺距均匀，管截面变形小，能满足生产工艺要求。     

Development of a new concrete pipe molding machine using topology optimization

Sulfur polymer concrete (SPC) is a relatively new material used to replace Portland cement for manufacturing sewer pipes. The objective of this work is to develop an efficient molding machine with an inner rotating die to mix, compress and shape the SPC pipe. First, the alternative concepts were generated based on the TRIZ principles to overcome the drawbacks of existing machines. Then, the concept scoring technique was used to identify the best design in terms of machine structure and product quality. Finally, topology optimization was applied with the support of the density method to reduce mass and to displace the inner die. Results showed that the die volume can be reduced by approximately 9% and the displacement can be decreased by approximately 3% when compared with the initial design. This work is expected to improve the manufacturing efficiency of the concrete pipe molding machine.

     

中空吹塑型坯壁厚多点控制研究

中空吹塑成型突出的缺点是中空吹塑成型产品壁厚均匀性不易控制,尤其是形状复杂的大型制品,其受型坯自重的影响,导致在型坯上发生减薄和缩颈现象。为了实现对大型中空吹塑件的壁厚进行均匀控制,设计了以多点控制来控制壁厚的计算方法,并借助于制造参数的调整,得到壁厚的理想厚度分布;设计了多点控制曲线,通过控制机头套与模芯构成的模唇间隙,达到最终控制中空吹塑产品壁厚的目的。研究结果表明,中空吹塑型坯壁厚控制精度为±1mm左右,能够满足实际生产要求。     

Study of injection molding process simulation and mold design of automotive back door panel

Numerical simulation of the injection molding process of the outer panel of the automotive plastic rear door and mold design is presented here. Computer aided three-dimensional interactive application (CATIA) is employed to design the original automotive steel structure, and the modal and thermodynamic properties of the plastic back door outer panel are changed by changing the different injection materials of the back door outer panel. In order to efficiently design the panels, finite element analysis is used to verify whether the designed parts meet the mechanical properties requirements such as light weight, low fuel consumption, short production cycle, strong modeling design, high corrosion resistance and good recovery, the above main parameters have been evaluated, and the above main parameters are carried out evaluate. To simulate the injection molding process, computer aided engineering (CAE) software such as ANSYS and HyperWorks are used to analyze the back door of the selected material. After the numerical analysis, suitable material is selected, so that the modal and thermodynamic properties of the product could be satisfied as well as improved. Unigraphics NX (UG) is employed to design the convex and concave mold for the injection molding of the automobile’s plastic back door panel. Combined with the characteristics of the parts and the design requirements of the injection mold, the multi-scheme design of the pouring and cooling system is carried out. By comparing the effects of different gating and cooling systems on injection molding, the best gating and cooling system is selected. The artificial fish swarm algorithm is used to optimize the process parameters of the injection molding process, and the best combination of the injection molding process parameters of the outer panel of the rear door of the automobile is obtained.

     

面向绿色注塑加工的工艺耦合参数设计优选方法

为提高产品加工过程的绿色性能,提出一种基于耦合推广正交算法的工艺参数优选方法。利用正交实验在解决单目标优化问题中的优势,提出基于工艺参数耦合强度关系的推广正交算法,用小生境演化繁殖后代,以实现多绿色性能指标优化。将该方法运用到注塑加工工艺参数设计中,选择面向绿色性能指标的注塑加工工艺参数,确定相互间的耦合强度关系以及注塑加工过程的多项绿色性能指标,建立注塑加工绿色设计模型。以某风机盖注塑加工为例验证了所提方法的可行性。     

曲线落料管技术剖析及对传统落料管优化设计

落料管将散料在不同空间位置输送机之间进行转运,其性能将影响整套散料输送系统的运行稳定性.由于物料和使用环境千差万别,传统的落料管设计技术往往无法得到理想的设计成果,而近年来新兴的曲线落料管技术的实际使用效果参差不齐.文中对曲线落料管技术进行剖析,并采用离散元仿真、理论计算和工程试验相结合的方法,将曲线落料管部分优势技术...     

Feature-based non-manifold modeling system to integrate design and analysis of injection molding products

Current CAE systems used for both the simulation of the injection molding process and the structural analysis of plastic parts accept solid models as geometric input. However, abstract models composed of sheets and wireframes are still used by CAE systems to carry out more analyses more efficiently. Therefore, to obtain an adequate abstract model, designers often have to simplify and idealize a detailed model of a part to a specific level of detail and/or abstraction. For such a process, we developed a feature-based design system based on a non-manifold modeling kernel supporting feature-based multi-resolution and multi-abstraction modeling capabilities. In this system, the geometric models for the CAD and CAE systems are merged into a single master model in a non-manifold topological representation, and then, for a given level of detail and abstraction, a simplified solid or non-manifold model is extracted immediately for an analysis. For a design change, the design and analysis models are modified simultaneously. As a result, this feature-based design system is able to provide a more integrated environment for the design and analysis of plastic injection molding parts. This paper was recommended for publication in revised form by Associate Editor Tae Hee Lee Sang Hun Lee received his B.S., M.S., and Ph. D. degrees in Mechanical Design and Production Engineering from Seoul National University, Korea, in 1986, 1988, and 1993, respectively. Dr. Lee is currently a Professor at the School of Mechanical and Automotive Engineering at Kookmin University in Seoul, Korea. His research interests include CAD/ CAM, human-centered design and engineering, digital human modeling and simulation, computer-aided automotive design and manufacturing., and computer-aided tooling design.     

钢管渗铝工艺与性能分析

综述了镀铝技术的发展现状,分析了扩散式渗铝工艺的基本工艺过程及其结构特点,根据设备生产工艺要求,制定实验项目,论证了渗铝钢管的力学性能、抗氧化性能、耐腐蚀性能等能够满足生产工艺要求,为渗铝工艺的改进与应用提供理论基础.