一个基于知识的曲轴锻模CAPP／CAM系统

介绍了一个基于知识的曲轴锻模ＣＡＰＰ／ＣＡＭ系统的组成与功能、使用的有关知识与知识表示、知识库的构造及推理机制问题。该系统可实现ＣＡＤ／ＣＡＰＰ／ＣＡＭ的集成．并自动完成工艺设计，是向ＣＩＭＳ方向发展的一个较为成功的尝试。     

微机环境下钣金件CAD／CAPP／CAM集成系统的研究与实现

介绍了一个在微机绘图软件ＡｕｔｏＣＡＤ１３．０ｆｏｒＷｉｎｄｏｗｓ９５上开发的基于特征的钣金件ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成系统。阐述了该系统的总体结构及其主要功能模块。     

叶片式动力转向油泵集成化CAD／CAPP／CAM系统的研究与开发

本文介绍了叶片式动力转向油泵集成化ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统的基本原理和实现方法,简单介绍了逆工程的概念及其在定子制造中的应用。     

集成化数控工艺过程设计

本文从集成的角度并结合飞机机加工结构件数控加工ＣＡＰＰ系统ＦＡ－ＣＡＰＰ的集成化数控工艺设计技术，对ＣＡＤ／ＣＡＰＰ／ＣＡＭ的集成，数据库和网络的支持，数控工艺决策专家系统等关键技术问题进行了研究与探讨。     

基于特征的产品模型及产品建模系统

基于特征的产品模型是ＣＡＤ／ＣＡＰＰ／ＣＡＭ集成以至ＣＩＭＳ实现的关键技术。文中提出了基于特征的产品模型结构，讨论了集成化的ＣＡＤ／ＣＡＭ系统对特征造型系统的要求，提出了基于特征的产品建模系统的结构。     

模具CAD／CAM／CAE一体化系统的开发研究

介绍了模具ＣＡＤ／ＣＡＭ／ＣＡＥ一体化系统的内容和应用ＣＡＤ／ＣＡＭ／ＣＡＥ技术产生的效益，分析了国内外在这个领域的研究情况和我国与先进国家在技术上的差距，指出了今后模具设计制造一体化工程系统的开发研究方向。     

冲模CAD／CAM的选型指南

冲模ＣＡＤ／ＣＡＭ的选型指南广州中科联系统工程公司薄建元１概述随着计算机和ＣＡＤ／ＣＡＭ技术的高速发展，冲模ＣＡＤ／ＣＡＭ在我国逐渐进人实用阶段，由于冲模ＣＡＤ／ＣＡＭ不仅能极大地降低设计人员的劳动强度而且能有效地提高设计效率，保证设计质量，缩短新产...     

模具CAD／CAM／CAE一体化系统的开发研究

介绍了模具ＣＡＤ／ＣＡＭ／ＣＡＥ一体化系统的内容和应用ＣＡＤ／ＣＡＭ／ＣＡＥ技术产生的效益，分析了国内外在这个领域的研究情况和我国与先进国家在技术上的差距，指出了今后模具设计制造一体化工程系统的开发研究方向。     

基于UG平台的压铸模CAD／CAM系统设计与实践

本文主要论述压铸模ＣＡＤ／ＣＡＭ系统的特点，系统地分析压铸模ＣＡＤ／ＣＡＭ系统的功能模块和结构，简要介绍三维实体ＣＡＤ／ＣＡＭ软件ＵＧ的功能，以及采用ＵＧ作为开发工作和平台，建立实用的压铸模ＣＡＤ／ＣＡＭ系统。     

一个箱体类零件的集成化CAPP系统

似箱体类零件为研究对象，提出一个集成化ＣＡＰＰ系统。以基于特征的分层描述法建立零件特征模型，以基于知识的创成方式为工艺决策，并基于黑板结构实现ＣＡＤ／ＣＡＰＰ／ＣＡＭ的集成。     

工艺参数和材料性能对板料成形回弹的影响

分析总结了数值模拟中模拟参数（有限无算法、单元类型、材料模型、本构方程、积分点选取、接触和摩擦法则等）对回弹模拟精度的影响。对一细长支腿零件的工艺成形过程进行了数值模拟,研究了工艺参数及材料性能参数（压边力、凸模圆角半径、凸凹模间隙、板料厚度、摩擦系数、材料硬化指数）对工件回弹的影响。回弹角随凸模圆角半径和凸凹模间隙的增大而增大,随压边力、扳料厚度、摩擦系数和材料硬化指数的增大而减小。     

金属板料成形工艺CAD／CAM智能化集成研究

根据现行发展状况,探讨了金属板料成形CADCAE智能化集成的必要性和可行性,分析了其中要解决的一些关键技术,提出了实现CADCAE智能化集成的方法。     

HG/PRODIE:基于特征设计的柔性级进模CAD/CAM系统

本文阐述了建立一个基于特征设计的柔性级进模CAD/CAM系统(HG/PRODIE)的重要性以及该系统的组成结构和功能。介绍了基于特征设计技术的板金件构型方法和交互式条料排样的原理。阐述了提高级进模CAD/CAM系统及效率的有效途径是在结构设计中选择一个合理的装配模型,并且建立一个与主系统独立的开放式模具标准件建库系统。     

Study on the usability and robustness of polymer and wood materials for tooling in sheet metal forming

The traditional market of sheet metal parts is based in high production volumes normally greater than 10.000 parts by using high-speed presses and highly automated operations, being the tooling usually made from steel or cast iron, which ensures the needed robustness for such production volumes. Current trends in stamping industries can be characterized by the increasing demand for individualization of products which leads to a growing development towards an increasing number of product variants, lower production volumes and shorter innovation cycles. These trends have triggered research in the development of faster and cost-effective tool manufacturing techniques suitable for low production volumes, since high investments in steel tools can only be compensated by huge volume series of one and the same part during long life cycles. A promising approach for production of small series of complex sheet metal parts is the use of non-conventional tooling materials such as polymers, wood and low melting point metals. The usage of these alternative materials in tooling is still looked with some suspicion, due to the lack of know-how on its processing and also on its wear durability, influenced by the required product geometry, blank material and expected production volume.

In this paper a study on the use of non conventional materials for tooling, to be used for producing a complex sheet metal part, is performed. The evolution of tool wear, roughness and geometrical changes in punch and die radius were measured and its influence in the stamped part geometry evaluated, for an imposed production volume target of 500 parts. Also a comparative study of the tooling costs is presented in order to assess the aptitude and economical feasibility of the use of these tooling materials for low production series.     

Surface flexible rolling for three-dimensional sheet metal parts

To realize highly effective and continuous fabrication of three-dimensional (3D) sheet metal parts, a new forming method, surface flexible rolling forming, has been investigated. This method takes only two integral flexible rolls as the forming tool. In the forming process, a non-uniform elongation in the rolling direction and a bending deformation in the thickness direction occur simultaneously, and finally three-dimensional surface parts are formed. In this work, the basic principle and forming mechanism of surface flexible rolling are studied. A method to calculate the transversal curvature radius of the arc-shaped roll is brought forward, while the feasibility is verified by the explicit dynamic finite element analysis. An experimental device has been developed and the forming experiments have been performed. Typical 3D surface parts including the convex and saddle surface parts have been obtained. Finite element model of surface flexible rolling is established and the effect of forming parameters such as reduction, velocity, bending radius and friction on the surface shape is analyzed. The forming effects including shape errors and thickness changes are studied by the deviation analysis. The results indicate that the formed surface is quite close to the criteria one; the thickness of the parts changes gradually and keeps within a narrow range. The experimental formed parts are measured and the forming accuracy is investigated. The results show that the accuracy is high, and are consistent with the simulation.     

薄板拉深中法兰区的屈曲分析

利用板壳理论中的Hill分又屈曲理论,建立了拉深中圆环形法兰边的屈曲模型,推导了各向同性板材的弹塑性稳定性方程,分析了法兰区板料屈曲的影响因素,提出了控制屈曲的方法,此屈曲模型对生产具有一定的理论指导意义。     

New developments on the use of polymeric materials in sheet metal forming

Advanced polymers offer at the present time concrete possibilities in reducing the product development time and production of prototypes and small series of sheet metal parts. However, the applicability of such materials requires different approaches in comparison to conventional materials for sheet metal forming dies. This paper presents investigation results dealing with tribological and tool design aspects for the use of polymeric materials in sheet metal forming. Friction and wear of sheets with different surface topologies have been investigated. A new test method for measuring polymer/sheet wear is presented. A coupled simulation model for the production of a test geometry aimed specifically at the investigation of die deformations and loads is presented. The behaviour of two polymeric materials by forming the test geometry has been simulated and the maximal loads and deformations during the process have been quantified. Simulation results have been subsequently validated in experimental testing.     

Optimal Programming of Multi-point Cushion Systems for Sheet Metal Forming

Numerical optimization technique coupled with finite element analysis of the stamping/sheet hydroforming process was developed to predict four possible modes for application of blank holder force (BHF) in multiple-point cushion systems, namely a) BHF constant in space/location and time/stroke, b) BHF variable in time/stroke and constant in space/location, c) BHF variable in space/location and constant in time/stroke and d) BHF variable in space/location and time/stroke. The BHF was predicted by (a) minimizing the risk of failure by tearing (thinning) in the formed part and (b) avoiding wrinkling. The developed technique was applied to predict the BHF to form a) an automotive part (liftgate-inner) from AA6111-T4 aluminum alloy, b) an asymmetric part from aluminum alloy AA5083-H32 by sheet hydroforming process with die (SHF-D) and c) a round cup by sheet hydroforming with punch (SHF-P). Experimental results showed that the FEM based optimization methodology can reduce trial and error effort and is able to predict the blank holder force necessary to form the parts without fracture and wrinkling in the investigated stamping and sheet hydroforming operations.     

Paddle Forming: A Novel Class of Sheet Metal Forming Processes

A novel class of ‘paddle forming’ processes for forming pronounced features within sheet metal components is presented. The processes are incremental in nature and are characterised by having contact between the tool and the workpiece along a short line segment. The processes lead to high through-thickness shear strains, which have been shown to increase the possible deformation before ductile instability occurs. Paddle forming tools, which are cheap and simple to manufacture, can be applied to the faces or edges of sheets, tubes and disks. Four example processes are demonstrated, each showing high deformation and pronounced through-thickness shear strain.     

Development of a new procedure for the experimental determination of the Forming Limit Curves

The objective of the paper is to define a new method for the experimental determination of the Forming Limit Curves (FLCs). The procedure is based on the hydraulic bulging of two specimens. The most important advantages of the method are the capability of investigating the whole strain range specific to the sheet metal forming processes, simplicity of the equipment, and reduction of the parasitic effects induced by the friction, as well as the occurrence of the necking in the polar region. The comparison between the FLCs determined using the new procedure and the Nakazima test shows minor differences.