英语翻译The material removal mechanism of WEDM is very similar to the conventional EDM process involving the erosion effect produced by the electrical discharges (sparks).In WEDM,material is eroded from the workpiece by a series of discrete spark

英语翻译The material removal mechanism of WEDM is very similar to the conventional EDM process involving the erosion effect produced by the electrical discharges (sparks).In WEDM,material is eroded from the workpiece by a series of discrete spark
英语翻译
The material removal mechanism of WEDM is very similar to the conventional EDM process involving the erosion effect produced by the electrical discharges (sparks).In WEDM,material is eroded from the workpiece by a series of discrete sparks occurring between the workpiece and the wire separated by a streamof dielectric fluid,which is continuously fed to the machining zone [4].However,today’s WEDM process is commonly conducted on workpieces that are totally submerged in a tank filled with dielectric fluid.Such a submerged method of WEDM promotes temperature stabilisation and efficient flushing especially in cases where the workpiece has varying thickness.The WEDM process makes use of electrical energy generating a channel of plasma between the cathode and anode [5],and turns it into thermal energy [6] at a temperature in the range of 8000–12,000 vC [7] or as high as 20,000 vC [8] initialising a substantial amount of heating and melting of material on the surface of each pole.When the pulsating direct current power supply occurring between 20,000 and 30,000 Hz [9] is turned off,the plasma channel breaks down.This causes a sudden reduction in the temperature allowing the circulating dielectric fluid to implore the plasma channel and flush the molten particles from the pole surfaces in the formof microscopic debris.While the material removal mechanisms of EDM and WEDM are similar,their functional characteristics are not identical.WEDM uses a thin wire continuously feeding through the workpiece by a microprocessor,which enable parts of complex shapes to be machined with exceptional high accuracy.A varying degree of taper ranging from15 v for a 100 mm thick to 30v for a 400 mm thick workpiece can also be obtained on the cut surface.The microprocessor also constantly maintains the gap between the wire and the workpiece,which varies from0.025 to 0.05 mm [2].WEDM eliminates the need for elaborate pre-shaped electrodes,which are commonly required in EDM to perform the roughing and finishing operations.In the case of WEDM,the wire has to make several machining passes along the profile to be machined to attain the required dimensional accuracy and surface finish (SF) quality.Kunieda and Furudate [10] tested the feasibility of conducting dry WEDM to improve the accuracy of the finishing operations,which was conducted in a gas atmosphere without using dielectric fluid.The typical WEDM cutting rates (CRs) are 300 mm2/min for a 50 mm thick D2 tool steel and 750 mm2/min for a 150 mm thick aluminium [11],and SF quality is as fine as 0.04–0.25 lRa.In addition,WEDM uses deionised water instead of hydrocarbon oil as the dielectric fluid and contains it within the sparking zone.The deionised water is not suitable for conventional EDM as it causes rapid electrode wear,but its low viscosity and rapid cooling rate make it ideal for WEDM [12].
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英语翻译The material removal mechanism of WEDM is very similar to the conventional EDM process involving the erosion effect produced by the electrical discharges (sparks).In WEDM,material is eroded from the workpiece by a series of discrete spark
WEDM 物质撤除机制与常规EDM 过程是非常相似介入侵蚀作用由放电(火花) 导致.在WEDM,材料被腐蚀从制件由一系列的分离火花发生在制件和导线之间由streamof 电介质流体分离,连续被哺养对用机器制造的区域[ 4 ] .但是,今天WEDM 过程共同地被举办在完全被淹没在油用电介质流体被加的制件.WEDM 这样一个被淹没的方法促进温度安定和高效率冲洗特别是在制件有变化的厚度处.WEDM 过程象20,000 vC 利用电能引起血浆渠道在负极和阳极[ 5 之间],和轮它入热能[ 6 ] 在一个温度在8000-12,000 vC [ 7的] 范围或一样高[ 8 ] 初始化一个大数额热化和熔化材料在各根杆表面.当搏动的直流电电源发生在20,000 和30,000 赫兹[ 9 之间] 被关闭,血浆渠道划分.这导致对温度的突然的减少允许流通的电介质流体祈求血浆渠道和冲洗溶解的微粒从杆表面在formof 微观残骸.当EDM 和WEDM 物质撤除机制相似,他们的功能特征不是相同的.WEDM 使用一根稀薄的导线连续哺养通过制件由微处理器,使复杂形状的部份用机器制造以例外高准确性.不同程度逐渐变得尖细排列的from15 v 一100 毫米厚实对30v 为一个400 毫米厚实的制件可能并且被获得在裁减表面.微处理器经常并且维护空白在导线和制件之间,变化from0.025 对0.05 毫米[ 2 ] .WEDM 消灭对精心制作的前形状的电极的需要,共同地必需在EDM 进行粗磨和最后工序.在WEDM 情况下,导线必须做几张用机器制造的通行证沿外形用机器制造获得必需的尺寸准确性和表面完成(SF) 质量.Kunieda 和Furudate [ 10 ] 测试了举办干燥WEDM 的可行性改进最后工序的准确性,被举办在气体大气没有使用电介质流体.典型的WEDM 切口率(CRs) 象0.04-0.25 lRa 是300 mm2/min 为50 毫米厚实的D2 工具钢和750 mm2/min 为150 毫米厚实的铝[ 11 ],和SF 质量是一样优良.另外,WEDM 使用被去离子的水代替碳氢化合物油作为电介质流体和包含它在引起的区域之内.被去离子的水不是适当的为常规EDM 因为它导致迅速电极穿戴,但它的低黏度和迅速冷却的速度做它理想为WEDM [ 12 ] .

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