共查询到19条相似文献,搜索用时 312 毫秒
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微细阵列方形轴孔的电火花和电化学组合加工工艺研究 总被引:2,自引:1,他引:2
对微细阵列轴孔的电火花、电化学组合加工工艺进行了分析和研究.用微细电火花线切割机加工出3×3至10×10系列方形阵列电极,宽度在25~90 μm, 加工中采用降低加工电压、加工电流、进给速度和减小工作液冲击等方法,获得了质量较好的阵列电极,并分别利用微细电化学加工和微细电火花加工两种工艺方法进行阵列孔加工.在加工过程中通过适度间歇抬刀、超声振动、循环流动工作液等方法,较好地解决了微弧放电、排屑、加工区温度过高等加工难题,获得了质量较好的大小在30~100 μm相应的阵列孔,从而实现了微细阵列轴孔的电火花、电化学组合加工,为大规模微细阵列轴孔的加工开辟了高效、可行的新工艺方法. 相似文献
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微细电加工要达到工业应用的目的,需兼顾加工效率和加工精度两方面的要求.以微细孔、微细三维结构的加工为目标,进行了微细孔电火花加工、三维微细结构电火花伺服扫描加工及微细电化学加工技术的研究开发.设计出微细电极的损耗补偿进给和导向机构,开发出三维微细结构的电火花伺服扫描加工工艺,研究了采用阵列微细电极的微细电化学加工方法.微细孔电火花加工可连续加工直径小至100 μm的孔.伺服扫描电火花加工可便捷地在小于1 mm2区域内加工出三维微细结构.提出的微细电化学加工技术路线拟将微细电解加工应用于阵列微细孔和三维微细结构的加工. 相似文献
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超声振动辅助电解磨削加工技术是一种以超声振动作为辅助、电解磨削为主要加工方式实现零件精加工的新型加工技术。为获得更高表面质量的管电极微孔,首先利用单因素法对GH625材料进行管电极打孔,初步得到最小平均锥度0.043°的微小孔,然后通过正交试验研究脉冲电压、电解液浓度、主轴进给速度、阴极转速对加工微小孔锥度和表面质量的影响规律。结果表明:在脉冲电压7 V、电解液质量分数14%、阴极转速12000 r/min、进给速度0.7 mm/min下,可获得内表面粗糙度和平均锥度分别为Ra0.499μm与0.036°的微小孔。 相似文献
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Film cooling holes are widely used in the aerospace industry, and their fabrication requires high machining speed and accuracy, as well as good surface quality. Tube electrode high-speed electrochemical discharge drilling (TSECDD) is a promising hybrid machining method for the fabrication of film cooling holes in difficult-to-machine superalloys. An electrochemical reaction can occur if a low-conductivity salt solution is used in the drilling. Materials can also be removed at a high speed using electrical discharge machining (EDM). Thus, TSECDD and electrochemical machining (ECM) can be combined into a unique machining process using a low-conductivity salt solution. This machining process achieves both a high machining speed and good surface finish. In this study, the material removal mechanism of TSECDD was studied using a low-conductivity salt solution, and comparisons with high-speed electrical discharge drilling were made. The performance of the process was investigated using salt solutions of various conductivities. The results show that there are different material removal mechanisms in the frontal gap and the lateral gap and that, in the latter, there is a transition from EDM to ECM. Experiments conducted using TSECDD confirm that the use of this process with a low-conductivity salt solution can improve the machining surface and machining efficiency achieved. The results also show that the use of a low-conductivity solution improves the material removal rate, the hole diameter, and the taper angle. 相似文献
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It is difficult to drill high aspect ratio through holes and complex shaped blind holes using micro EDM. The debris concentration in the narrow discharge gap causes abnormal discharges leading to excessive electrode wear and lower machining precision. In micro EDM, the electrode size is too small for internal flushing. This paper presents a new approach for effective self-flushing using planetary movement. Through micro holes with an aspect ratio of 18 have been drilled. This approach is also demonstrated by drilling blind noncircular micro holes with sharp corners and edges. The process performance characteristics are analyzed under different machining conditions. 相似文献
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综合电火花加工快速蚀除材料与电解加工溶解重铸层的优势,提出了在低电导率的NaNO3溶液中使用电极逐层往复式铣削加工微小方孔的电火花-电解复合加工方法,并研究了电解液浓度、电压和电容参数对微小方孔加工质量的影响。结果表明:电解液浓度与加工电压对微小方孔加工质量影响较大,电容影响相对较小。选用最优加工参数在100μm厚的321不锈钢片上加工微小方孔,得到的方孔加工质量好、侧壁表面无重铸层,且工具电极相对损耗仅0.05%。 相似文献
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Sequential Laser and EDM Micro-drilling for Next Generation Fuel Injection Nozzle Manufacture 总被引:1,自引:0,他引:1
High quality holes of diameters less than 145 μm are required for the manufacture of next generation diesel fuel injection nozzles for improved combustion efficiency and reduction of emission to the environment. The current practice of using electro-discharge machining (EDM) drilling of fuel injection nozzles is limited in terms of the hole size it can produce effectively and the length of time needed to drill. In addition, the tooling cost is high. This paper reports on an investigation into a sequential laser and EDM micro-drilling technique for the manufacture of next generation fuel injection nozzles. A laser-drilled pilot hole is rimmed out by EDM drilling. It was found that this hybrid process has eliminated the problems of recast and heat affected zones typically associated with the laser drilling process. The new process has enabled a 70% reduction in total drilling time compared to standard EDM drilling as less material is removed by the EDM. The quality of the holes is as good as direct EDM drilling, thus eliminating the need for re-certification of the drilling process. Various combinations of laser/EDM drilling conditions have been examined. Optimum diameters for the pilot hole and the EDM electrode have been identified for a particular diameter of fuel injection nozzle, giving the minimum total drilling time and the best quality holes. A special system was designed to enable the alignment of nozzles to be controlled to within ± 20 μm. The technique has enabled valuable cost savings and increase in production capacity for next generation fuel injection nozzle manufacture. 相似文献
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钎焊金刚石磨粒钻适合钻削碳纤维增强碳化硅陶瓷基复合材料孔,但大量切屑会对孔的钻削过程产生不利影响。为此,针对切屑排出过程,分析切屑形貌,研究钻削时切屑对轴向钻削力、孔加工质量、钻头磨损的影响。结果表明:切屑对轴向钻削力有影响,尤其钻削深孔时影响显著。切屑对孔进口的加工质量几乎没有影响,只表现为孔进口处的轻微崩边;切屑对孔出口的加工质量影响显著,可引起严重的纤维断裂、撕裂缺陷以及基体的大区域脱落。同时,切屑加剧钻头磨损,使钻头不仅出现崩刃、微裂纹等轻微磨损,而且还产生基体剥落、金刚石剥落等严重磨损行为。 相似文献
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基于TC4复合材料研究了大余量去除和大直径孔的电解钻孔加工技术。首先,设计了工具阴极结构,在工具阴极侧面绝缘基础上采用电场仿真研究了工作圈高度对加工效果的影响,再针对不同钻孔深度进行流场仿真分析,揭示电解钻孔加工流场分布规律并探究了工具阴极端面出液孔数量对加工稳定性的影响;其次,对陶瓷绝缘和电泳绝缘两种不同绝缘方式下的工具耐用性进行了试验对比,结果表明:高电压下陶瓷绝缘层的耐用度明显优于电泳绝缘层;然后,采用陶瓷绝缘工具阴极对不同加工参数下的电解钻孔深度、入口直径、圆度、锥度等性能进行比较并优化了加工参数;最后,利用优选的参数加工得到入口直径21.43 mm、孔深39.19 mm、圆度误差0.028 mm和锥度0.068°的盲孔。 相似文献