基于PowerMILL的电极自动编程系统开发

以VB6.0为平台,利用宏命令对PowerMILL进行二次开发,建立了电极加工工艺模板库、工艺策略库及刀具库,开发了一套电极自动编程系统,系统能实现电极加工代码的快速生成,提高编程效率,有一定参考价值。     

基于模具电极的CAPP系统的研究与开发

根据同一类零件有相似性,相似的零件有相似的工艺过程的原理,对电极进行分类,建立电极加工模板库,并利用VB和SQL Server数据库技术建立电极工艺管理系统。对Powermill进行二次开发,使其可以与工艺管理数据系统进行人机交互。通过对比电极,找到与当前目标电极相似的电极的工序,然后从数据库中选择可以使用的编程模板,从而达到减少重复劳动、提高编程效率的目的。     

基于实例推理的模具高速加工编程辅助系统开发

在CAD/CAM软件中应用创建好的模板文件进行模具高速加工编程可以实现工艺知识快速套用,提高编程效率.该文开发了一个基于实例推理的网络化编程辅助系统,利用基于实例推理技术,将以前数控编程与加工中积累的工艺参数和经验以编程模板形式存储在数据库中,为新的零件提供参考解决方案,通过简单的特征输入,快速选择适用的编程模板进行编程.     

模具高速加工编程模板的开发及应用

对注塑模具的工艺结构特征及其加工工艺进行研究,基于Cimatron E软件环境开发了模具高速铣数控加工编程模板,以提高NC编程质量和效率,规范工艺路线与工艺参数.并以模具型腔的数控编程为例验证了编程模板的可行性和实用性.     

基于PowerMILL的模具零件电极自动编程管理系统研究与开发

针对应用PowerMILL加工模具零件电极时重复劳动多、编程效率低等问题,以Visual Basic6.0为开发平台,利用宏命令对PowerMILL进行二次开发,建立了电极实例库、刀具库、策略库和工艺模板库,开发了电极自动编程管理系统。实践表明,系统能明显提高编程效率,进而提高加工效率,降低生产成本。     

基于Cimatron E模板的电极快速设计与制造

介绍了Cimatron E软件中电极设计与数控编程过程,同时探讨了基于电极模板的电极快速设计与基于编程模板的快速数控编程.实际应用表明,应用Cimatron E模板进行电极设计与数控编程可大幅度提高工作效率.     

塑胶模具电极自动编程的开发与应用

分析了电极数控加工编程的特点,通过加工区域智能识别与选取,刀具路径策略模板化和策略参数自动设置实现了电极数控加工编程的自动化。在实际生产的应用中,大大提高了加工效率,避免了人工编程错误的发生。     

线切割编程中电极丝偏移量的分析与计算

针对电火花线切割工艺特征,分析了线切割加工中电极丝偏移量产生的原因,提出数控编程中电极丝中心线实际加工轨迹的计算方法及工件线切割加工的工艺性分析与特殊工艺的处理方法,以提高线切割加工件的加工精度和制造质量。     

变型零件快速数控编程方法

为了快速获得变型零件的数控加工程序,提出一种基于零件族数控程序母模板快速派生出变型零件数控加工程序的编程方法.首先分析、研究了零件的变型设计过程和数控编程原理,对加工特征进行了定义和划分,以零件族母模型加工特征为单元进行数控加工信息的组织,设计并构建零件族数控程序母模板,然后在零件事物特性表的驱动和工艺决策库的支持下,由零件族数控程序母模板自动生成变型零件的数控加工程序,实现变型零件的快速数控编程.最后通过实例验证了这些原理和方法的可行性.     

基于NX的覆盖件模具斜楔智能数控编程系统研究

为了解决传统交互式图形编程方法编制斜楔数控加工程序效率不高的问题,基于NX设计了智能数控编程系统,针对如何识别斜楔特征和抽取加工边界的问题,基于三维模型B-rep表达方法,提出了基于特征核心平面的特征识别算法和加工边界抽取算法,可准确识别斜楔的几何参数。为解决特征与数控工艺模板快速匹配的问题,提出了通用的数控工艺模板键值对表示方法,该方法可以根据特征快速检索对应的工艺方案,以企业典型的斜楔测试智能数控编程系统为例,结果表明特征识别准确率可达90%,总体数控程序合格率可达80%。     

喷丝板小孔电火花加工工艺研究

研究了喷丝板小孔的放电加工工艺和对应电极的制造技术,先用数控加工的方法制造电极,再用电极对小孔进行批量加工。通过优化电极结构、电极制造工艺以及小孔的放电加工工艺,缩短了总体加工时间,并保证了加工的安全性,提高了加工效率。     

Surface modification by electrical discharge machining: A review

The last decade has seen an increasing interest in the novel applications of electrical discharge machining (EDM) process, with particular emphasis on the potential of this process for surface modification. Besides erosion of work material during machining, the intrinsic nature of the process results in removal of some tool material also. Formation of the plasma channel consisting of material vapours from the eroding work material and tool electrode; and pyrolysis of the dielectric affect the surface composition after machining and consequently, its properties. Deliberate material transfer may be carried out under specific machining conditions by using either composite electrodes or by dispersing metallic powders in the dielectric or both. This paper presents a review on the phenomenon of surface modification by electric discharge machining and future trends of its applications.     

Layer Generation Process on Work-piece in Electrical Discharge Machining

In recant years, surface modification of metals and machining of insulating ceramics by electrical discharge machining (EDM) have been successfully carried out. In surface modification by EDM with semi-sintered electrodes, worn substances in the gap region form the material source of the layer generated on the work-piece surface. In the machining of insulating ceramics by EDM, a crystallized carbon layer or carbide layer from the working oil covers the surface of the insulator. Increase in the thickness of the generated layer, however, tends to stop at a certain maximum value in both surface modification by EDM with semi-sintered electrodes and machining of insulating ceramics by EDM processes. In these machining operations, accretion and removal phenomena occur alternately. In this paper, the mechanisms of machining insulators and the accretion process are discussed considering the characteristics of the generated layers on the work-piece surface.     

基于润湿供液的电化学放电线切割实验研究

针对非导电硬脆材料的微细线切割加工,设计并搭建了基于润湿供液的电化学放电线切割装置,实现了对石英材料的有效切割,确定了实现电化学放电线切割加工的临界电压。通过提取加工过程中能反映极间状态的电流信号作为控制加工的依据,实现了对石英材料的可控加工,实验表明加工速率及槽宽随着电压的增加而增大。通过对工件步进进给和匀速进给两种加工方式的比较表明,利用电流信号作为进给控制依据进行步进进给能更好地保证加工的连续性。     

石墨电极的电加工性能

介绍了石墨电极的优点 ,从石墨电极的分类、制造工艺流程、物理特性对其放电加工性能的影响对几种类型的石墨电极进行了叙述 ,可为生产中根据加工件的材料及加工精度的不同选择合适的石墨电极材料提供参考     

A new method of optimising material removal rate using EDM with copper–tungsten electrodes

Electrical discharge machining (EDM) is widely used in the production of dies. This paper describes an investigation into the optimisation of the process which uses the effect of carbon which has migrated from the dielectric to tungsten–copper electrodes. This work has led to the development of a two-stage EDM machining process where different EDM settings are used for the two stages of the process giving a significantly improved material removal rate for a given tool wear ratio.     

微细电极的正交点电接触在线测量及组合制作工艺

为服务于微细电火花加工用微细工具电极在线制作,提出一种正交点电接触标准细棒的微细电极在线测量方法。将电极轴线与标准细棒轴线正交（垂直）布置,通过电极外径与标准细棒外径之间低压电感知的点接触方式,避免或减少标准棒尺寸误差和安装误差的影响。提出采用自穿孔成形伺服反拷法和线电极磨削法组合工艺,并结合在线测量反馈方式,实现了钨材料微细电极较高效率的在线制作,尺寸可控精度可达±1．5μm。     

Machining of micro rotational parts by wire electrical discharge grinding

Micro rotational parts are used in several industrial sectors. Well-known applications are micro shafts of gears, ejector pins in forming tools, pin electrodes for micro electrical discharge drilling or micro stamping dies. Depending on the geometrical complexity of micro rotational parts different process variants of micro electrical discharge machining characterized by a rotating work piece can be used: wire electrical discharge grinding (WEDG) with fine wire electrodes, electrical discharge turning (EDT) with micro structured tool electrode, cylindrical electrical discharge grinding (CEDG) with micro profiled disk electrode. Characteristic to these process variants is the superimposed relative motion between the rotating electrodes and the feed. This relative motion can be varied in a wide circumferential velocity range to improve the material removal process. The paper gives an overview of kinematic and technological restrictions and requirements of the WEDG process influencing the process behavior with respect to the technological requirements of micromachining.