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电火花线切割精加工的表面粗糙度是衡量加工性能的重要指标之一。在加工过程中,表面粗糙度会受到放电电流的影响,其中包括放电电流能量、电流脉宽及电流极性的影响。通过在低速走丝电火花线切割机上进行多次加工实验,研究分析了放电电流对线切割精加工表面粗糙度的影响规律。 相似文献
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对往复走丝电火花线切割加工现有工艺指标——切割速度、表面粗糙度及加工精度进行了探究,为提出新的工艺指标提供有利于往复走丝电火花线切割加工技术发展的依据。介绍了单向走丝电火花线切割加工与往复走丝电火花线切割加工的本质区别,论述了往复走丝电火花线切割加工的生命力及其技术发展的定位。 相似文献
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分析了当前往复走丝电火花线切割机床在高效切割、解决丝耗、导丝定位等方面遇到的技术瓶颈,提出了相应的解决思路。对于高效切割,关键问题是要解决大电流加工条件下工作液在极间迅速汽化的问题;对于丝耗问题,提出了一种往复走丝渐进送丝的新走丝方式;对于电极丝导丝问题,认为采用非强制间隙约束方式是导丝器的发展方式。 相似文献
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大面积PCD复合片电火花加工高效节能脉冲电源的研究 总被引:6,自引:0,他引:6
本文通过对大面积PCD复合片材料物理特性的分析及电火花放电加工PCD表面放电机理的研究,分析了电火花加工大面积PCD复合片时影响加工速度及表面质量的重要因素。提出了用于加工大面积PCD复合片的理想电源模型,其特点为:大能量、高峰值电压、高峰值电流、窄脉冲、等脉冲能量输出。根据理想电源模型开发出一种高效、节能、环保型大面积PCD复合片电火花专用脉冲电源。与普通电火花脉冲电源比较,该电源加工效率高、加工表面质量好,电能利用率高,是大面积PCD复合片电火花加工的有效工具。 相似文献
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目的研究电火花线切割工艺对金属材料加工表面质量的影响规律,分析加工表面的机械性能。方法利用电火花线切割加工技术,对304不锈钢工件进行表面切割试验,应用马尔轮廓测量仪、扫描电镜、超景深电子显微镜及纳米压痕仪观察电火花加工表面的粗糙度变化规律和表面微形貌特征,获取横截面纳米硬度变化曲线。设计正交试验,获得最优加工参数。结果脉冲宽度和峰值电流对奥氏体不锈钢加工表面形貌的形成机制有显著影响,加工表面粗糙度受电参数的影响较大,加工表面的表层及次表层组织主要由塑性变形层与回火多相组织层共同构成,厚度与纳米硬度的变化受电参数的影响较大。结论电参数对表面质量的影响程度顺序为脉冲宽度、峰值电流、放电间隔,为得到较优加工表面层,应优先选择脉冲宽度为16μs,放电间隔为96μs,峰值电流为1.5 A的工艺参数组合。单个脉冲能量对加工层的厚度以及表层的纳米硬度呈现出近似线性规律。 相似文献
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Fuzhu Han Jun Jiang Dingwen Yu 《International Journal of Machine Tools and Manufacture》2007,47(7-8):1187-1196
In finish machining of wire electrical discharge machining (WEDM), the discharge current has distinct influences on the machined surface. In order to study the differences in surface morphology under various pulse durations, thermo-analysis was carried out to investigate the mechanism of erosion of the workpiece material using the finite element method. Additionally, related single discharge experiments under different pulse energies were performed. Under the same discharge energy, the comparison of analytical and experimental results shows that a discharge current with a short-duration pulse and a high peak value removes the workpiece material mainly by gasifying, while a discharge current with a long-duration pulse and low peak value removes the workpiece material mainly by melting. It was also found that surfaces machined by a discharge current with a short- and long-duration pulses would have similar roughness values when the pulse energies were almost the same and were high enough; however, the surface morphologies would be totally different. A discharge current with a long pulse duration and a low peak value could not produce craters on the workpiece surface when the pulse energy was reduced to a certain value. However, a discharge current with a short pulse duration and a high peak value could produce clear craters on the workpiece surface. This indicates that a discharge current with a short pulse duration and a high peak value can generate better surface roughness, which cannot be achieved with a current with a long pulse duration and a low peak value. 相似文献
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聚晶金刚石具有优良的力、热、化学、声、光、电等性能,在现代工业、国防等领域中得到日益广泛的应用。但是,聚晶金刚石硬度高,耐磨性好,其成型加工非常困难,超声电火花机械复合加工技术是一种有效的加工方法。本研究在分析电火花超声机械复合加工原理的基础上,采用青铜结合剂金刚石砂轮实现了聚晶金刚石的超声电火花机械复合加工。实验分析了超声电火花机械复合加工过程工艺参数与加工效果之间的关系,结果表明,脉宽、脉间、峰值电流、超声振幅、开路电压等参数对复合加工过程工艺结果的影响程度较明显。 相似文献
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Study of specific discharge energy in WEDM and its application 总被引:1,自引:0,他引:1
Y. S. Liao Y. P. Yu 《International Journal of Machine Tools and Manufacture》2004,44(12-13):1373-1380
The relationship between machining parameters and machining characteristics of different materials in WEDM is difficult to obtain because a large number of experiments must be conducted repeatedly. A new concept attempting to solve this problem is presented in this paper. The specific discharge energy (SDE) defining as the real energy required to remove a unit volume of material is proposed. The SDE is constant for a specific material. Experimental results reveal that the relative relationship of SDE between different materials is invariant as long as all materials are machined under the same machining conditions. It is also found that the materials having close value of SDE demonstrate very similar machining characteristics such as machining speed, discharge frequency, groove width and surface finish of the machined surface under the same machining conditions. This result can be applied for the determination of the settings of machining parameters of different materials. Furthermore, by dimensional analysis of SDE, a quantitative relationship between machining characteristics such as the material removal rate and the efficiency of material removal and machining parameters is derived. 相似文献
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电火花线切割加工参数对加工速度和表面粗糙度影响的研究 总被引:1,自引:0,他引:1
讨论了电火花线切割加工中影响加工速度和表面粗糙度的几个主要参数:脉冲宽度、峰值电流、脉冲间隔及工件厚度,并通过正交试验分析了加工参数对加工速度、表面粗糙度的影响关系,为科学、合理地设定电火花线切割加工参数提供了参考。 相似文献