基于模拟反馈的注塑成型并行设计方法研究

:为提高注塑产品开发效率和产品质量 ,本文引入了基于模拟反馈的注塑成型并行设计方法 ,建立起注塑产品设计分析反馈环与注塑模设计分析反馈环 ,有效地集成产品设计、模具设计和数值分析过程。同时采用与神经网络相结合的 CBR模具设计技术和基于 RBR的 CAE分析结果后处理技术 ,构造一个注塑成型设计分析并行系统     

塑料注射模具的并行设计方法

塑料制品注射成型属于一次成型工艺 ,传统的串行模具设计和制造方式 ,造成了对设计经验的过分依赖和模具返修率的提高 ,本文举例介绍了基于流动模拟技术的注射模并行设计方法 ,说明了 CAE对模具结构设计和相关注塑工艺的指导作用。     

面向注塑行业的网络化模具快速设计系统开发

针对注塑模具设计的过程和目前塑模生产企业的需求特点,提出并构造了基于WEB的注塑模具快速设计系统,集成了开发的部分辅助计算、设计软件和协同设计工具,研究应用了WEB和服务器数据库的互连技术。     

基于流动模拟的注塑模并行设计方法

塑料制品注射成型属于一次成型工艺,传统的串行模具设计和制造方式,造成了对设计经验物过分依赖和模具返修率的提高,在一定程度上制约了注塑模块的设计水平的提高和产品开发的周期。这里介绍了基于流动模拟技术的注射模并行设计方法。     

基于Internet的注塑模具智能化并行设计系统研究

在系统地分析了注塑模具设计制造的知识结构层次关系及相关过程的基础上,基于Internet环境和并行工程思想,以AutoCAD为平台,应用面向对象、数据库、人工智能及特征建模等技术与方法,开发了基于Internet的注塑模具智能化并行设计系统,建立了统一的集成化产品信息模型;研究了注塑产品可模塑性评价,模具计算机辅助报价,基于特征的模具三维参数化设计,产品缺陷分析诊断等各功能模块的知识表达与信息反馈及共享机制;讨论了系统实现的关键技术.为注塑模具实现网络化、智能化、并行化设计,缩短模具开发周期,提高模具质量,提供了有效的技术支持.     

基于JSP的工艺设计与调度并行技术的研究

基于并行工程思想,提出了工艺设计与生产调度并行集成方法,在建立工艺设计及生产调度集成概念数据模型的基础上,重点研究了基于JSP的系统开发关键技术.     

基于JSP的工艺设计与调度并行实现技术的研究

基于并行工程思想,提出了工艺设计与生产调度并行集成方法,在建立工艺设计及生产调度集成概念数据模型的基础上,重点研究了基于JSP的系统开发关键技术.     

基于JSP的工艺设计与调度并行实现技术的研究

基于并行工程思想,提出了工艺设计与生产调度并行集成方法,在建立工艺设计及生产调度集成概念数据模型的基础上,重点研究了基于JSP的系统开发关键技术。     

变模温注塑热响应模拟与模具结构优化

变模温注塑可根据不同工艺阶段的特点和要求,随时调整模具温度。在塑料熔体充模过程中,如果模具表面温度保持在塑料玻璃化转变温度以上,可以彻底解决常规注塑工艺存在的熔接痕、喷射痕、流动痕、翘曲和浮纤等缺陷。同时在冷却阶段,通过快速冷却已赋形的塑料熔体,以减小注塑成型周期。从而在不影响注塑生产效率的基础上,提升注塑件的品质。基于这种思想,在深入研究变模温注塑工艺原理的基础上,提出一套新的利用蒸汽辅助加热的模具温度控制方法,制定其工艺流程,并构建相应的动态模温控制装置和系统。通过研究蒸汽辅助加热变模温注塑模具的结构特点,提出了4种不同的模具设计方案,利用有限元软件ANSYS构建了变模温注塑模具传热分析模型,分别对变模温注塑工艺的加热、冷却过程进行温度响应模拟。以减小成型周期和提高温度均匀性为目标,对模具设计方案进行优化分析。将模拟分析获得的结果应用于平板电视机面板的注塑生产,验证分析结果的有效性。     

面向并行集成环境的CAPP技术

在液压缸并行设计系统中,提出了ＣＡＤ ＣＡＰＰ并行集成的思想,认为零件设计与工艺设计是一个宏观上并行,微观上串行的过程。应用特征技术建立了面向并行集成环境的零件模型;建立了基于知识的工艺决策;给出了面向并行集成环境的ＣＡＰＰ系统的总体结构和信息需求;实现了面向并行工程的液压缸ＣＡＰＰ系统。     

A CAD/CAE-integrated injection mold design system for plastic products

Mold design is a knowledge-intensive process. This paper describes a knowledge-based oriented, parametric, modular and feature-based integrated computer-aided design/computer-aided engineering (CAD/CAE) system for mold design. Development of CAx systems for numerical simulation of plastic injection molding and mold design has opened new possibilities of product analysis during the mold design. The proposed system integrates Pro/ENGINEER system with the specially developed module for the calculation of injection molding parameters, mold design, and selection of mold elements. The system interface uses parametric and CAD/CAE feature-based database to streamline the process of design, editing, and reviewing. Also presented are general structure and part of output results from the proposed CAD/CAE-integrated injection mold design system.     

A collaborative navigation system for concurrent mold design

As products become ever more diversified, their life cycles are becoming shorter. To reduce production costs, increased process automation and concurrent design are priorities. Therefore, a collaborative integrated design system is crucial in the mold design and manufacturing process. This research develops a collaborative navigation system for concurrent mold design within the computer-aided design (CAD) browser, using Pro/Web.Link as the core tool. Providing both concurrent engineering and collaborative design functions, the navigation system is capable of assisting designers in accomplishing 3D mold development efficiently and accurately with the help of the standard component library and design decision-making system. The results show significant time savings over other mold design process methodologies.     

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.     

Development of a concurrent mold design system: a knowledge-based approach

This paper presents research that establishes a systematic methodology and knowledge base for an injection-molding mold design in a concurrent engineering environment. This methodology is, in general, analogous to the methods of design for manufacturing, and is, however, in collaboration with activities of molding product design and mold manufacturing process planning. The practical goal of this research is twofold: to develop a mold-development process that facilitates concurrent engineering-based practice and to develop a knowledge-based design aid for injection-molding mold design that accommodates manufacturability concerns, as well as requirements of products. The research approach includes (i) process modeling and reengineering for concurrent mold design, (ii) identification of functional requirements with a computer-based system, (iii) system framework design, and (iv) system modeling and implementation. The framework supports concurrent engineering based mold design by providing advisory tools that are able to resolve relevant issues at the early stages of mold design. The results of this research will facilitate the rationalization and automation of the mold development process, thus improving the efficiency and quality of, and reducing the cost of, mold development.     

A framework of a concurrent process planning system for mold manufacturing

This paper presents a research on the development of a computer-based framework that supports concurrent mold manufacturing process planning. The practical goal of this research is three-fold: (1) to develop a systematic and concurrent mold manufacturing process planning model, (2) to develop a computer-based mold manufacturing process planning system based on the concurrent model, and (3) to develop knowledge bases to assist in concurrent type of mold manufacturing process planning that accommodates mold development concerns, as well as the requirements of the products. The approach of this work includes steps of (1) modeling and reengineering concurrent mold manufacturing process planning, (2) analysis of system functional requirements, (3) system framework design, and (4) system modeling and implementation. The results of this research will facilitate the rationalization and automation of the mold development process planning, thus improving the efficiency and quality, and also reducing the cost of molding product and process development.     

Developing an Integrated Intelligent Framework to Support an Engineering Change Process for an Axial Piston Pump

Since the concepts of concurrent engineering were introduced in mid 1980s, the product design process has become complicated. This is because many factors related to the life cycle of the product may need to be considered during the design stage. Therefore, shortening product development time becomes important for the survival of an enterprise. In this paper, an integrated intelligent environment to support concurrent engineering is proposed. Two major modules are provided by this system to assist change management. One is a constraint network module that analyses the related constraints about a design change to find the design variables influenced. Another is a product assembly module that extracts the design data from a CAD database to analyse the spatial relationships relating to an assembly. The data in the above two modules are integrated in a data integrated module, in which an entity relational data model was developed to describe the integrated data. Finally, a web-based query system was developed to provide a multiplatform environment for the user to refer to the data in the constraint network module and the product assembly module during a design change process. The proposed environment is implemented in the design change process for an axial piston pump.     

注塑产品与模具协同设计任务规划算法研究

协同设计支持多功能小组兆同参与一个产品的设计过程,在产品开发的初始阶段,合理的任务规划将有利于协同设计的顺利进行,从而提高设计效率与质量。对协同设计任务规划系统开发的关键技术进行研究,采用模糊设计结构矩阵描述设计子任务的耦合关系,提出了新的模糊排序算法指导设计过程的分解与重组;基于综合能力、兴趣和时间约束分配设计任务,并根据协同设计过程的并行度与耦合度测定,提出了新的协同设计任务调度的时间分配策略。最后以注塑产品及模具协同设计为对象进行了验证。     

A virtual injection molding system based on numerical simulation

CAD and CAE have now become very popular in injection molding development. Integration with virtual reality is a new boost to these fields. This paper presents a research effort targeting the creation of a desktop-based, low-cost and independent virtual injection molding system, which is implemented based on the techniques such as virtual reality, finite element analysis, motion simulation and scientific visualization. With the stereoscopic display of the mold design and motion, the system provides engineers a cohesive view of mold structure and assembly. And by analyzing the numerical CAE results, the possible faults during molding process can also be highlighted. With this integration, the overall system would be a new powerful tool to mimic the real process of injection molding and evaluate various influences from product design to manufacturing, capable, therefore, of improving the moldability and the quality of molded products.     

Virtual plastic injection molding based on virtual reality technique

Virtual reality (VR), as a new technology, is integrated with software systems for engineering, design, and manufacturing. The integration has given a new impetus to the field of computer-aided engineering. This paper presents a research effort aimed at creating a virtual plastic injection molding (VPIM) environment, which is designed and implemented based on techniques such as VR, multidiscipline simulation, and scientific visualization. The VPIM system includes two parts: designing in VPIM and evaluation in VPIM. It is the first system to scrutinize virtual prototype mock-ups of new products, machines and production processes in interactive graphic simulation. During the evaluating phase, coupled to appropriate computer-based reasoning and decision-support tools and driven by data from the real manufacturing environment, a realistic impression of the process of plastic injection molding and manufacture can be achieved and can be changed interactively, and it is possible to thoroughly examine the planned system and eventually detect and remove any defects and inadequacies. The construction approach and key techniques (FEA, virtual assembly, stereoscopic display, a triangulated boundary-representation of an approximating polyhedron, collision detection, etc.) of the system are described in detail. The overall system is a powerful new approach for highly relevant industrial application of VPIM which focuses on the construction and assessment of alternate manufacturing sequences and mold design in an early design stage. Improvement of the design and manufacturing process will lead to better design and reduced development time and cost.