快速成形技术及其应用

概述了快速成形技术的基本原理及应用特点,重点介绍了快速成形技术在模具制造中的应用。     

光热平面快速成形技术

在原有快速成形技术上进行改进，提出了一种新型快速原型制造技术——光热平面快速成形技术，对它的原理进行了系统的阐述，并分析了它在理论上的可行性以及实践上的难点所在。     

激光选择性烧结金属粉末快速成形的研究

描述了激光选择性烧结金属粉末快速成形设备的粉末供给和铺平压实系统及动作，探讨了烧结过程参数对烧结质量的影响，粘结剂含量、孔隙率和缺陷尺寸与烧结件压缩强度之间的关系，并指出影响激光选择性烧结的重要因素是烧结粉末的特性、激光参数的设置等。     

快速原型与铸造技术的集成成形制造

在介绍快速原型技术的基础上,提出了快速原型与铸造相集成的快速零件／模具制造工艺,可以实现零件／模具的快速精确成形制造。通过案例分析了快速原型技术在铸造中的应用,认为该技术在铸造行业中具有广泛地应用前景。     

快速成形技术—制造业的一场革命

论述快速成形技术的概念和主要工艺方法,同时叙述了快速成形技术的主要特点及应用。     

选择性电沉积快速成形法

介绍了选择性电沉积快速成形法的研究现状和试验设备，该方法可用电解液喷射电沉积来生产金属部件，并对其中的关键性技术作了探讨。     

基于选择性激光烧结的铸造熔模快速制造技术

快速原型制造技术（快速成形技术）是国际上２０世纪８０年代末期以来制造领域的一个研究热点,其分层制造的思想成功地解决了复杂三维实体的制作难题。同时,由于其根据零件的ＣＡＤ模型直接生成三维实体,因此可以极大缩短零件的制造周期。本文详细阐述了快速成形技术的一个重要分支－－选择性激光烧结技术用于快速制造铸造熔模的方法,并介绍了一个应用实例。     

快速成形技术在新产品开发中的应用

介绍快速成形技术的原理和特点,简述选择性激光烧结技术的工作原理,举例分析公司引进快速成形技术后的产品开发模式。     

选择性激光熔化快速成形技术与装备

介绍了华中科技大学基于粉末材料选择性激光熔化（Selective laser melting，SLM）成形技术的一些最新研究成果，主要包括设备与软件，以及该技术的主要应用领域。由于SLM成形过程是一个复杂的物理化学冶金过程，金属粉末熔化快，熔池存在时间短，凝固成形时存在较大的温度梯度与热应力，液态金属表面张力大，因而容易产生翘曲变形、裂纹与球化现象三个国际性难题，针对这些难题，提出了相应的研究方案。     

选择性激光熔化快速成形技术与装备

介绍了华中科技大学基于粉末材料选择性激光熔化(Selective laser melting,SLM)成形技术的一些最新研究成果,主要包括设备与软件,以及该技术的主要应用领域.由于SLM成形过程是一个复杂的物理化学冶金过程,金属粉末熔化快,熔池存在时间短,凝固成形时存在较大的温度梯度与热应力,液态金属表面张力大,因而容易产生翘曲变形、裂纹与球化现象三个国际性难题,针对这些难题,提出了相应的研究方案.     

Asymmetric Single Point Incremental Forming of Sheet Metal

The use of computers in manufacturing has enabled the development of several new sheet metal forming processes, which are based upon older technologies. This paper describes modifications that have been made to traditional forming methods such as conventional spinning and shear forming, forming processes in which deformation is localized. Recent advances have enabled this localized deformation to be accurately controlled and studied. Current developments have been focused on forming asymmetric parts using CNC technology, without the need for costly dies. Asymmetric Incremental Sheet Forming has the potential to revolutionize sheet metal forming, making it accessible to all levels of manufacturing. This paper describes the genesis and current state-of-the-art of Asymmetric Incremental Sheet Forming.     

连接座工艺分析与级进模设计

分析了连接座零件成形工艺,介绍了冲孔、成形、切断无搭边级进模排样设计和模具结构。模具可实现自动送料、卸料、出料、无搭边冲裁,工作性能好,冲件质量高。     

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.     

快速成型制造中的工艺参数设置

介绍了模具制造中的一项新技术——快速成型制造的工作原理,并从模型处理和参数设置两方面提出了提高成型精度及成型效率的方法。同时探讨了成型过程中容易出现的问题,并从成型工艺上提出了解决的办法。     

Analysis of Process Parameters and Forming Mechanisms within the Electromagnetic Forming Process

Electromagnetic forming (EMF) is a typical high speed forming process using the energy density of a pulsed magnetic field to form workpieces made of metals with high electrical conductivity like e.g. aluminium. In view of new lightweight constructions, special forming processes like EMF gain importance for the associated materials. For a better understanding of the working mechanisms and the process prediction a coupling of electromagnetical and structure-mechanical models, advanced simulation tools as well as detailed experimental investigations with on-line measurements of the ultra-fast deformation of significant workpiece areas is required. New results of research concerning correlations among workpiece properties, strain rate, and acting magnetic pressure are presented.     

旋铆成形过程的数值模拟分析

以2017材料的φ6 mm×16 mm铆钉为对象,基于Simufact.Forming有限元软件,运用点历史追踪法对其旋铆成形过程进行数值模拟研究,分析旋铆过程中的等效应力变化及应力分布情况,以及成形载荷变化规律及其影响因素。分析结果为某产品的旋铆工艺应用提供了理论依据。     

钢制底座成形工艺与模具设计

分析了钢制底座成形的难点,针对这些难点制定了相应的工艺方案和有效地解决措施,并设计了相应的模具结构,通过试验成功地验证了该工艺的可行性,对类似零件的成形具有一定的参考价值。     

Laser Assisted Incremental Forming: Formability and Accuracy Improvement

Single point incremental forming accuracy suffers from contradictory material requirements: while a low yield strength and low hardening coefficient are favourable in terms of limiting process forces and springback, they also result in excessive, unwanted plastic deformation in zones bordering processed areas. Dynamic, localised heat input, for example through radiation of the tool contact area by means of a laser beam, allows to differentiate material properties in time and space. Experimental results demonstrate that this process variant results in reduced process forces, improved dimensional accuracy and increased formability for a range of materials. Initial results also indicate that residual stresses can be significantly reduced by means of the dynamic heating system that was developed.     

Analysis of Material Formability in Incremental Forming

Incremental forming is an innovative sheet metal forming technology in which a blank is plastically deformed through the progressive action of a small-size punch, whose movement is governed by a CNC machine. In this way the tool locally deforms the material through an almost pure stretching deformation mechanics.The paper is focused on material formability in incremental forming. Several tests were developed, aimed to the achievement of different straining conditions in the material and consequently to the determination of Forming Limit Diagrams for progressive forming operations. The features and the application of such FLD are discussed in the paper.     

基于Windows2000快速成型SLA控制系统的研究

首先对Windows2000的体系结构和实时性进行了分析，并指明Winodws2000是开发数控系统的理想平台，接着阐述了设备驱动程序的性能和结构，最后详细介绍了快速成型SLA控制系统的硬件结构和软件设计。