高速走丝线切割机的断丝原因及对策

断丝是线切割加工中的常见问题，造成断丝的原因也很多。针对高速走丝电火花线切割加工过程中的断丝问题，综述并补充分析了影响电火花切割中断丝的相关因素，并提出了切实有效的减少断丝现象的对策。     

高速走丝线切割有关电极丝断丝的分析及处理

针对高速走丝电火花线切割加工中与电极丝相关断丝的原因,进行详细的分析,并分别就不同的原因提出了对策,这些对策能行之有效地减少断丝。     

再谈高速走丝线切割机断丝原因的分析及对策

针对高速走丝电火花线切割加工的断丝问题，从各个方面补充分析了线切割加工中的断丝原因及解决方法，这些方法能切实有效地减少断丝的发生。     

“中走丝”电火花线切割机床的特点

所谓"中走丝"电火花线切割机床,准确地说应该是具有多次切割功能的高速走丝电火花线切割机床.它的走丝速度为1.5～10 m/s,可以根据需要进行调节.其走丝速度和加工质量介于高速走丝和低速走丝线切割加工之间. "中走丝"电火花线切割加工与传统的高速走丝电火花线切割加工相比,既有继承,又有发展,它具有以下一些特点:     

高速走丝线切割加工过程中电极丝花斑现象的起因及对策

高速走丝电火花线切割加工过程中，电极丝有时会出现先有花斑后断丝的现象。在试验研究的基础上，讨论了电极丝花斑现象的发生原因和解决方法。     

快速走丝电火花线切割机床断丝故障分析及解决措施

从快速走丝电火花线切割机床结构出发,简述了电火花线切割加工放电过程的机理,针对DK7732数控线切割机床切割加工中的频繁断丝问题进行分析,指出了产生的主要原因和相应的解决措施,对提高线切割生产效率和加工质量具有一定意义。     

单向走丝电火花线切割电极丝的分类及发展

正确选用单向走丝电火花线切割的电极丝,对高速切割和高精度加工起着至关重要的作用,对提高工艺稳定性和降低加工成本也有重要的影响。通过叙述单向走丝电火花线切割电极丝从紫铜丝到镀锌丝的发展过程,以及电极丝的性能、种类及优缺点等,进一步分析了电极丝的发展趋势,有助于加工时对各类电极丝的正确选用。     

粗丝下料电火花线切割断丝原因初探

针对断丝现象会降低粗丝下料电火花线切割加工效率这一问题,从观察断口形态特征的角度对粗丝下料电火花线切割加工中的断丝现象进行了探索性分析.总结出拉断、熔断、切断及脆断4种断口形态,分别对4种断口形态的形成过程及原因进行了分析.首次提出氢脆是造成电极丝脆断的原因之一,介绍了氢脆现象的特点,并分析了电极丝发生氢脆的过程.     

低速走丝电火花线切割加工断丝原因分析及处理

在查阅国内外大量文献的基础上，结合自身的实际工作经验，从电极丝、工作液、伺服控制和脉冲电源控制策略等几个方面，详细分析了低速走丝电火花线切割加工发生断丝现象的主要原因，并提出了相应的改进措施。     

高速走丝电火花线切割加工质量控制系统框架及其关键技术

综述了高速走丝电火花线切割加工的质量指标及其影响因素，全面、系统地分析了加工质量控制系统的组成与功能，就加工质量控制系统中的关键技术进行了较为详细的说明，并首次建立了高速走丝电火花线切割加工质量控制系统框架。     

Monitoring and self-learning fuzzy control for wire rupture prevention in wire electrical discharge machining

Wire breaking is a serious problem in the application of wire electrical discharge machining (WEDM). A WEDM sparking frequency monitoring and control system based on the characteristics of the voltage waveform of WEDM is developed. A new self-learning fuzzy controller is proposed to control the sparking frequency at a safe level by regulating the pulse off-time in real time for avoiding wire rupture and maintaining a state of high metal removal rate. The developed control strategy is tested under the conditions of cutting a workpiece with continuous sharp angles, a change in workpiece height during machining process, and machining with a high feed-rate. Experimental results show that this monitoring and control system can control the sparking frequency at a predetermined level without the risk of wire rupture.     

Study of wire breaking process and monitoring of WEDM

Wire rupture in the Wire Electrical Discharge Machining (WEDM) process is a serious problem to manufacturers. A new computer-aided pulse discrimination system based on the characteristics of voltage waveform during machining was developed in this paper. With the use of this system, a large amount of sparking frequency data during wire rupture process and under normal working conditions were collected and analyzed. Two symptoms of wire rupture were identified: the excess of arc sparks, and a sudden rise of the total sparking frequency. The governing mechanisms of these two types of wire rupture were found from the SEM and EDAX analyses of the ruptured wire electrode. Furthermore, an index to monitor wire breaking was identified, and its relationships with the metal removal rate and machining parameters were found. Based on the results obtained in the paper, a control strategy to prevent wire from rupturing while at the same time improving the machining speed is proposed.     

Thermo-mechanical analysis and optimal tension control of micro wire electrode

The tension control of the micro wire electrode is a key technology for the micro wire electro-discharge machining (WEDM). Based on the coupled thermo-mechanical analysis, both the three-dimensional temperature and the stress distribution in the micro wire are determined. As a result, the tension of the micro wire electrode during the WEDM process can be optimized in accordance with the discharge energy, which is sampled and fed back to the tension control system in real time. Then the development of an optimal tension control system characterized by the form of master–slaver structure makes it possible to keep the wire tension optimal in the process of WEDM. The results of the machining experiments show that the optimal wire tension control is effective on the improvement of the machining accuracy with the prevention of wire breakage for the micro WEDM.     

线切割加工中断丝原因的分析及解决措施

以DK7725型快走丝线切割机为例，对快走丝线切割机加工中出现的断丝问题，按照加工过程归类分析了断丝原因，并从机床及工艺方面提出了相应的解决措施。     

电火花线切割加工表面微织构技术研究

表面微织构加工是一个相当复杂的过程,涉及微织构的尺寸、质量及形貌等问题。为解决制备微织构存在的问题,利用数控电火花线切割加工技术,在45钢表面加工微槽织构,研究线切割制备微织构的尺寸、形貌。试验分别采用钼丝、铜丝作为电极丝,设计脉宽、脉停、电流等线切割正交试验,切割宽度小于400μm的微槽织构,分析不同线切割参数、电极丝材料对微槽尺寸精度和微槽切口处光整度的影响。通过采集、测量试验所得工件表面微槽织构,发现线切割参数对微槽尺寸精度和切口处光整度有较大的影响;在较小线切割参数下,钼丝切割的微槽尺寸大于铜丝,在较大的线切割参数下,铜丝切割的微槽尺寸大于钼丝;对比微槽切口处光整度,发现钼丝切割的微槽整体质量优于铜丝。试验列出不同线切割参数切割的微槽尺寸,为电火花线切割加工微织构提供了试验数据。     

往复走丝电火花线切割在高速加工中的电极丝寿命研究

分析了往复走丝电火花线切割在高速加工中影响电极丝寿命的主要因素,在一定电源脉冲参数且平稳切割的前提下,通过典型电极丝对不同工件厚度的切割对比和试验数据分析,得出切割厚度是影响电极丝寿命的主要因素之一。     

掺钴镁新型线切割钼丝的制备

介绍了一种掺钴镁新型线切割钼丝的制备方法。在二氧化钼粉中加入钴、镁元素,经粉末冶金和机械加工制作出用于电火花线切割加工的钼合金电极丝。不仅改善了线切割用钼丝的高温性能、抗拉强度、放电效率和抗损性能,而且提高了其应用价值。     

State of the art in wire electrical discharge machining (WEDM)

Wire electrical discharge machining (WEDM) is a specialised thermal machining process capable of accurately machining parts with varying hardness or complex shapes, which have sharp edges that are very difficult to be machined by the main stream machining processes. This practical technology of the WEDM process is based on the conventional EDM sparking phenomenon utilising the widely accepted non-contact technique of material removal. Since the introduction of the process, WEDM has evolved from a simple means of making tools and dies to the best alternative of producing micro-scale parts with the highest degree of dimensional accuracy and surface finish quality.Over the years, the WEDM process has remained as a competitive and economical machining option fulfilling the demanding machining requirements imposed by the short product development cycles and the growing cost pressures. However, the risk of wire breakage and bending has undermined the full potential of the process drastically reducing the efficiency and accuracy of the WEDM operation. A significant amount of research has explored the different methodologies of achieving the ultimate WEDM goals of optimising the numerous process parameters analytically with the total elimination of the wire breakages thereby also improving the overall machining reliability.This paper reviews the vast array of research work carried out from the spin-off from the EDM process to the development of the WEDM. It reports on the WEDM research involving the optimisation of the process parameters surveying the influence of the various factors affecting the machining performance and productivity. The paper also highlights the adaptive monitoring and control of the process investigating the feasibility of the different control strategies of obtaining the optimal machining conditions. A wide range of WEDM industrial applications are reported together with the development of the hybrid machining processes. The final part of the paper discusses these developments and outlines the possible trends for future WEDM research.