共查询到19条相似文献,搜索用时 93 毫秒
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多孔质电极电火花加工采用多孔材料作为工具电极。多孔质电极由紫铜颗粒经高温烧结获得,在加工过程中可利用颗粒间孔隙形成的流道实现分布式的全向内冲液。通过制备符合电火花加工要求的多孔质电极并搭建实验系统,对多孔质电极的电火花加工性能进行了实验研究。经与实体电极进行对比发现,在工件上表面加工较浅的型腔时,由于多孔质电极表面不平整,易发生大量的侧向放电,其在材料去除率方面与实体电极相比没有优势;而在深孔中加工时,由于排屑条件恶化,采用多孔质电极后可利用分布式的内冲液极大改善极间状态,并可采用不抬刀方式加工,相同条件下材料去除率达到实体电极的4倍。 相似文献
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3Cr2W8V电火花成形加工工艺指标试验研究 总被引:1,自引:0,他引:1
通过电火花成形加工3Cr2W8V的实验研究,探索了峰值电流、脉冲宽度和脉冲间隔对电火花成形加工的加工速度、电极损耗的影响,总结出3Cr2W8V电火花成形加工合理的加工参数.实验表明:峰值电流为18.4 A、脉冲宽度为130 μs、脉冲间隔为24 μs时,可以进行高效加工.这对模具制造中采用电火花成形加工具有一定的指导意义. 相似文献
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电火花加工用钨铜电极制造工艺研究 总被引:5,自引:0,他引:5
采用冷等静压(CIP)成型→烧结→熔渗→热等静压(HIP)处理工艺制取高密度蒿性能电火花加工用WCu电极材料。热等静压处理使WCu电极性能有较大幅度的提高。 相似文献
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电极材料对电火花加工质量影响的分析 总被引:3,自引:0,他引:3
对电火花加工中电极材料的合理选取作了详细的分析和探讨,并用实验结果分析了电极材料性能对加工质量的影响,说明了电极材料是影响电火花加工质量的一个重要因素。 相似文献
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提出了对电极耗损进行补偿的新算法,这种算法操作简单,并且在实际中取得了较好的运用效果。 相似文献
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以电火花多电极加工3Cr13模具型腔为研究对象,以提高材料去除率和降低电极损耗为目标,对负极性标准切入加工时不同电极材料的电火花加工性能(加工效率、电极损耗)进行研究,设计并进行了不同工艺参数下紫铜电极和Cu50W铜钨合金电极加工试验,获得了不同条件下的材料去除率和电极相对损耗参数,并对多电极电火花加工工艺及经济性进行了分析,结果表明:相同工艺参数下,加工性能因电极材料热学性能不同而不同,Cu50W铜钨合金的材料去除率约为紫铜的85.7%,而电极相对损耗约为紫铜的42.9%,从而为电火花加工不锈钢模具材料的电极选择提供了理论依据. 相似文献
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B. H. Yan C. C. Wang W. D. Liu F. Y. Huang 《The International Journal of Advanced Manufacturing Technology》2000,16(5):322-333
This work optimises the cutting of Al2O3/6061Al composite using rotary electro-discharging machining (EDM) with a disklike electrode by using Taguchi methodology.
The Taguchi method is used to formulate the experimental layout, to analyse the effect of each EDM parameter on the machining
characteristics, and to predict the optimal choice for each EDM parameter. Four observed values, MRR, EWR, REWR, and SR, are
used to verify this optimisation of the machining technique. In addition, six independent parameters are chosen as variables
in evaluating the Taguchi method and are categorised into two groups:
1. Electrical parameters, e.g. polarity, peak current, pulse duration, and powder supply voltage.
2. Non-electrical parameters, e.g. circumferential speed of electrode, reciprocating speed. The analysis of the Taguchi method
reveals that, in general, the electrical group more significantly affects the machining characteristics than the non-electrical
group. Also derived herein are semi-empirical equation that contain all of the machining characteristics. Experimental results
are presented to illustrate the proposed approach. 相似文献
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Ching-Tien Lin Han-Ming Chow Lieh-Dai Yang Yuan-Feng Chen 《The International Journal of Advanced Manufacturing Technology》2007,34(1-2):104-110
This study addresses micro-slit EDM machining feasibility using pure water as the dielectric fluid. Experimental results revealed
that pure water could be used as a dielectric fluid and adopting negative polarity EDM machining could obtain high material
removal rate (MRR), low electrode wear, small slit expansion, and little machined burr, compared to positive polarity machining.
In comparing kerosene versus pure water, pure water was observed to cause low carbon adherence to the electrode surface. Also
discharge energy does not decrease and the discharge processes are not interrupted. Therefore, MRR was higher, and related
electrode wear ratio compared to kerosene use was lower. In a continual EDM with multi-slit machining, kerosene will cause
carbon element adherence, creating an initially high MRR and electrode wear, with rapid decline. However, pure water will
not cause carbon element adherence on the electrode surface, so MRR and electrode wear is always stable in this process. 相似文献
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模具的电火花套型加工工艺研究 总被引:4,自引:0,他引:4
使用紫铜丝制作线框电极,采用电火花腐蚀方法,以套型的方式加工模具型腔和型芯。分析了电火花套型加工的工艺原理、特点及加工工艺规律和加工效率。应用电火花套型加工工艺制作了模具型腔和型芯,并用该模具压制出了橡胶制品。电火花套型加工工艺的电极制作简单,可显著提高加工效率,降低生产成本。 相似文献
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Yan-Cherng Lin Han-Ming Chow Biing-Hwa Yan Hsinn-Jyh Tzeng 《The International Journal of Advanced Manufacturing Technology》2007,33(5-6):489-497
This research investigated the effects of the fine-finishing process on microholes in abrasive fluid machining (AFM). Microholes
on stainless steel (SUS 304) and titanium alloy (Ti-6Al-4V) plates were fabricated using a deep drilling machine of electrical
discharge machining (EDM) prior to AFM. In the experiment, the Taguchi method was adopted to explore the effects of the machining
parameters associated with AFM on the experimentally observed values, such as the material removal rate (MRR) and differences
between the dimensions of the entrance and the exit of the microhole. Furthermore, the improvement in the shape precision
of the microhole fabricated by EDM and subsequently fine-finished by AFM was also elucidated by using a scanning electron
microscope (SEM). The significant machining parameters and the optimal combination levels of the machining parameters were
identified by analysis of variance (ANOVA) and the S/N (signal-to-noise) ratio response graph obtained from the analysis of
the experimental data. 相似文献
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钛合金TC4放电加工电极损耗研究 总被引:1,自引:0,他引:1
针对钛合金TC4在火花油中放电加工电极损耗大的问题,以蒸馏水和火花油为工作介质,进行了钛合金TC4的放电加工试验,分析比较了两者的电极绝对损耗量和相对损耗率的差异,并从加工波形和加工后电极的表面微观形貌及主要成分等几个方面研究了电极损耗机制。结果表明:蒸馏水的绝缘性较差,而流动性和冷却性好,消电离较充分,改善了极间状态,加工稳定,使加工效率大大提高;另外加工过程中产生的少量氧化钛和从工件飞溅的蚀除产物附着在电极表面,形成覆盖层,有效抑制了电极损耗。其电极绝对损耗与火花油加工时相差不大但相对损耗却大大降低。 相似文献
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制作一种电火花小孔加工用Cu-Ni复合电极,其原理是基于电镀层和基体材料性能的差异,改变电极材料电蚀性能,保证电极端面和侧面的均匀损耗。在D703F型高速电火花小孔加工机床上,用Cu-Ni电极加工1Cr18Ni9Ti不锈钢材料,与常用的普通铜管电极对比。结果表明:在相同的加工条件下,Cu-Ni复合电极的电极损耗明显降低,同时改善了因电极损耗引起的被加工工件的尺寸精度和形状精度。 相似文献