浅析电参数对快走丝电火花线切割表面质量和加工精度的影响

针对快走丝电火花线切割中存在的表面质量差、加工精度低的问题,分析了快走丝电火花线切割加工条件中放电参数（脉冲宽度ON、功率管数IP、脉冲间隔OFF、开路电压、脉冲频率）对零件表面粗糙度、加工精度的影响,为快走丝电火花线切割加工积累了经验。     

提高模具电火花加工切割形状精度的途径

电火花线切割是模具零件的主要加工方式。模具加工精度包括表面粗糙度、形状位置精度和尺寸精度,慢走丝线切割难以控制表面粗糙度和形状精度。影响数控电火花线切割加工精度的因素主要有偏移量、取件位置、切割路线、起点、装夹与定位及引入、切出、超切、回退程序等。通过进行合理的工艺分析,正确计算数控编程中电极丝的设计走丝轨迹,可确保模具的加工精度。通过确定穿丝孔和优化切割路线来改善切割工艺,是提高模具型腔切割质量和生产效率的一条行之有效的重要途径。     

复合走丝电火花线切割机床走丝方式改善加工性能的实现

为了在低成本下改善加工性能,针对传统高速走丝电火花线切割加工表面粗糙度比较低的问题,笔者提出采用新型复合走丝电火花线切割机加工工件的改善方法。通过分析复合走丝电极丝高速旋转而带来电火花磨削加工功能的特殊效应,改传统的电极丝单边损耗为周边损耗,使得电极丝偏移量的影响减小,由于改善了放电间隙的排屑条件,从而消除了换向条纹。试验结果表明:该方法明显提高了加工精度及降低了表面粗糙度。     

高速走丝线切割大厚度工件表面粗糙度影响因素研究

大厚度工件高速走丝线切割是比较困难的加工。在加工过程中,表面粗糙度会受到放电参数和工作液工作状况的影响。通过在高速走丝电火花线切割机上进行多次加工实验,研究分析了上述因素对大厚度工件线切割表面粗糙度的影响规律。     

快走丝线切割加工质量的影响因素与解决措施

表面粗糙度是衡量电火花线切割加工性能的重要指标之一.文中从主要影响电火花线切割加工表面粗糙度的机械因素、脉冲参数、进给速度、工作液性能等方面分析原因,并提出提高高速走丝线切割加工工件表面质量的方法.为提高高速走丝切割加工表面质量提供了参考.     

线切割加工模具表面粗糙度的研究与应用

以模具零件曲面加工为目标,对快走丝线切割加工技术进行了研究.在线切割加工放电间隙、模具零件表面加工粗糙度的理论分析基础上,探讨了影响线切割模具加工的工艺评价指标因素;通过研究加工模具零件表面粗糙度的两个主要构成要素,提出了提高和改善线切割加工模具表面粗糙度的措施,只有综合考虑各方面的影响因素才能获得模具零件加工好的表面...     

线电极张力检测机构设计

分析了快走丝线切割机床线电极张力机构存在的张力值不能量化，在实际工程中依靠经验估计等一些问题，改进设计了张力检测机构。定量分析了张力对加工质量和表面粗糙度的影响。指出了快走丝电火花线切割机床线电极的张力如果能够量化选择，在工作过程中能够适时补偿，将有利于提高该类机床的技术含量和快走丝线切割机床的加工质量。     

6061铝合金电火花线切割加工工艺研究

针对电火花线切割加工6061铝合金现状,分析了断丝及加工表面粗糙度超值的原因,提出了解决断丝及改善加工表面粗糙度的措施,提高了加工效率,保证了产品质量要求。     

钛合金Ti-6Al-4V的电火花线切割参数试验研究

为了研究钛合金电火花线切割加工中影响加工速度与加工材料表面粗糙度的电参数因素,以快走丝电火花线切割机床的电参数为控变因子研究各个电参数对钛合金加工后的表面质量和加工速度的影响规律。通过单因素试验,正交试验的极差分析,研究电火花线切割各电参数对其性能指标的影响,试验结果表明:材料去除率与表面粗糙度是一对相互矛盾指标,各电参数对于这两项指标都有不同程度的影响。该研究旨在为优化钛合金的加工工艺提供参考。     

电火花线切割车削机床的研究及实现

介绍了数控电火花线切割车削机床的机械结构及利用旋转主轴进行的加工.电火花线切割车削机床利用数控线切割机床新增加的旋转轴,不仅可以加工大锥度的圆台,还可以加工形状复杂的空间曲面零件.为解决快走丝电火花线切割加工空间曲面的难题打下基础,具有较高的应用和推广价值.     

快走丝线切割机新型恒张力机构

针对传统恒张力机构的弊端，提出了一种新型恒张力机构。该机构提高了电极丝在加工区的动态位置精度，为快走丝多次切割技术创造了条件。     

Research on electrochemical discharge-assisted diamond wire cutting of insulating ceramics

Insulating ceramics are difficult to cut because of their high hardness and brittleness properties. This research proposes an electrochemical discharge-assisted diamond wire method for cutting insulating ceramics. The high temperature generated from electrochemical discharge facilitates the spalling of ceramics by the moving diamond wire. Experimental results showed that the material removal rate (MRR) of the new cutting method increased compared with the conventional diamond wire cutting process. Besides, electrochemical discharge had limited influence on the surface roughness and the wear of diamond wire. Additionally, the influence of the process parameters (DC voltage, wire speed, and counterweight mass) on the MRR and surface roughness was analyzed through experiments. The results showed that the MRR and surface roughness initially increased and then decreased with the increasing DC voltage; however, the variation was little. The higher wire speed resulted in an increased MRR and had little influence on the surface roughness. The MRR and surface roughness increased with the increasing counterweight mass.     

快走丝电火花线切割加工仿真系统

通过神经网络技术建立了快走丝电火花线切割加工工艺模型 ,利用穷举法建立了具有一定人工智能的工艺参数全局优化系统 ,开发了模具电火花加工过程仿真系统。该系统不仅可以精确预测加工效果 ,而且克服了工艺参数表的局限性 ,弥补了建立在工艺参数表基础上的参数自动选取系统的缺陷 ,实现了工艺参数全局最优化。测试结果及实际使用结果表明本文所建立的仿真系统反映了机床的加工工艺特性 ,预测误差基本控制在 8%内 ,系统的参数优化选取功能使机床的加工性能得以充分发挥。仿真系统具有广泛的通用性 ,可适用于不同类型的线切割加工机床。     

The effect of the cutting parameters on performance of WEDM

In this study, variations of cutting performance with pulse time, open circuit voltage, wire speed and dielectric fluid pressure were experimentally investigated in Wire Electrical Discharge Machining (WEDM) process. Brass wire with 0.25 mm diameter and AISI 4140 steel with 10 mm thickness were used as tool and work materials in the experiments. The cutting performance outputs considered in this study were surface roughness and cutting speed. It is found experimentally that increasing pulse time, open circuit voltage, wire speed and dielectric fluid pressure increase the surface roughness and cutting speed. The variation of cutting speed and surface roughness with cutting parameters is modeled by using a regression analysis method. Then, for WEDM with multi-cutting performance outputs, an optimization work is performed using this mathematical models. In addition, the importance of the cutting parameters on the cutting performance outputs is determined by using the variance analysis (ANOVA).     

轮廓法测量残余应力中影响切割质量的参数研究

针对轮廓法测量残余应力的特殊要求,通过Plackett-Burman结合正交试验方法,揭示了线切割参数对轮廓法切割质量的影响规律,获得了对测量精度影响较大的三个因素:送丝速率、丝张力和峰值电流。方差分析的结果表明,较小的峰值电流和较大的丝张力有助于改善切割质量通过Box-Behnken响应面分析法,获得了表面粗糙度的预测模型,验证试验显示误差在5.011%以内,证明了该预测模型的有效性。     

Performance Analysis of Wire Electrodes on Machining Ti-6Al-4V Alloy using Electrical Discharge Machining Process

High-strength materials with complex shapes can be easily machined by electrical discharge machining process. In the present study, an attempt has been made to analyze the influence of wire electrode on Kerf width and workpiece surface roughness in wire EDM process. Due to its importance in the aircrafts and automobiles, Ti-6Al-4V alloy has been chosen as the workpiece material. The various experiments have been conducted based on a Taguchi L₉ orthogonal array with various types of wire electrodes, such as conventional brass wire, zinc-coated wire and diffused coated brass wire. From the experimental results, it has been observed that diffused coated wire produced better surface finish with minimum kerf width compared to the other two wire electrodes. It has also been observed that the pulse off-time has more influent nature on machining characteristics such as surface roughness and kerf width.     

混粉电火花技术在粗加工中的应用研究

在对混粉电火花加工机理进行系统研究的基础上 ,对混粉电火花在粗加工中的加工效率和加工表面粗糙度进行实验研究。结果表明 ,通过合理选择放电参数 ,混粉电火花在相近加工表面粗糙度下 ,能够显著提高加工效率 ,从而为混粉电火花加工技术在粗加工中应用提供依据     

Experimental investigation and prediction of optimum process parameters of micro-wire-cut EDM of 2205 DSS

Micro-wire-cut electrode discharge machining (EDM) is an emerging manufacturing process in the field of micro-manufacturing to fabricate the complex profiles of micro-components. It is a complex process involving various process parameters such as pulse on time, pulse off time, wire speed, wire tension and current. In addition to micro-fabrication, this process can also be extended in the field of tool design and developments such as dies, moulds, precision manufacturing, contour cutting, etc., where complex shapes need to be generated with high-grade dimensional accuracy and surface finish. In this research work, an attempt is made to investigate the effect of process parameters on the output variables such as material removal rate (MRR), surface finish and the cutting width (kerf) of wire-cut EDM for duplex stainless steel (DSS). Scanning electron microscopy (SEM) has been used to capture the images of the kerf width, and the measurements are taken with the help of the welding expert system and software. An optimization technique (Taguchi method) has been employed to identify the optimum parameters of the micro-wire-cut EDM process for cutting 2205 grade duplex stainless steel. The effect of each control parameter on the performance measure is studied individually using the plots of signal to noise ratio.     

微小型零件切断装置优化设计分析

为了提高零件的加工效率与加工质量,加工过程中应尽量避免再次装夹。本文采用慢走丝电火花线切割技术设计(一种新型装置),在五轴数控铣床上实现了对微小型零件自动化切断加工。在设计过程中,采用Genetic Aggregation响应曲面法,结合多目标遗传算法对固定板结构进行多目标优化,使微小型零件切断装置具有固有频率,丝架达到最大变形,X2滑台最大变形达到最优。