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球槽曲面是一种球形轮廓扫掠曲线所形成的包络曲面,该曲面所构成的零件驱动轴和螺杆常应用于盘式制动器,可采用电解加工实现高效加工.采用数值分析方法研究了两种电解液流动方式的三种方案对流场的影响,得出电解液侧向短流程方案的流场均匀性较好,并进行了电解加工试验验证.其次,采用数值分析方法研究了导流结构参数、电解液入口压力和压力对流场的影响,并选择最优参数进行了电解加工试验验证.最后,选择不同极间电压与进给速度进行球槽曲面电解加工试验,得知极间电压与平衡间隙成正比、进给速度与平衡间隙成反比,尽量小的极间电压与高进给速度,可得到较好的工艺稳定性. 相似文献
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介绍在耐高温镍基合金上进行脉冲电解加工小孔的试验研究.分析了加工过程中脉冲宽度、脉冲间隔、工具电极进给速度对小孔加工的精度影响.结果表明:采用较小的电参数和较大的工具电极进给速度,有利于减小小孔的侧面加工间隙,提高孔的加工精度. 相似文献
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以高温镍基合金Inconel718为基材进行气膜冷却孔电解加工基础试验,在电解加工过程中,阴极反应界面析出氢气,导致电解液的电导率不再是一个常数,从而影响冷却孔的加工成型精度。结合前期基础试验,建立冷却孔电解加工流道二维模型,基于COMSOL Multiphysics软件对冷却孔端面间隙内气液两相流场进行仿真,研究加工电压、电解液入口压力及管电极进给速度对氢气析出量的影响,并定性地分析电解加工过程中气泡率与电导率之间的关系。由仿真结果可知:氢气的体积分数随加工电压和电极进给速度的增大而增大,随电解液入口压力的增大而减小,且氢气体积分数越大,电解液的电导率越小。 相似文献
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钛合金是航空航天工业中应用广泛的一种难加工材料,对加工过程中参数选择要求较高.利用正交试验法对不同的精密振动电解参数加工钛合金试件表面效果进行对比,并结合阴极进给、脉冲参数、脉冲开通角、加工电压等关键因素对实际加工过程的影响,优选出各参数间的合理匹配方式,探索了钛合金精密振动电解加工的参数优化方法. 相似文献
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混气电解机床控制系统的研制 总被引:1,自引:0,他引:1
本文介绍的混气电解加工微机控制系统具有控制气液比、调节阴极进给速度和对电解机床进行程序控制的功能。该控制系统采用调节液体流量的方法适应控制加工间隙中的气液比,利用计算机的中断处理功能随挖得机床主轴的位置和讲给速度。 相似文献
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Achieving high accuracy and high removal rate in micro-EDM by electrostatic induction feeding method 总被引:1,自引:0,他引:1
T. Koyano 《CIRP Annals》2010,59(1):219-222
With conventional relaxation pulse generators used in micro-electrical discharge machining, due to the difficulty in keeping the minimum necessary discharge interval between pulse discharges, localized discharge and abnormal arc occur frequently. In contrast, with the newly developed electrostatic induction feeding method, only a single discharge occurs for each cycle of the periodic pulse voltage. As this realizes sufficient cooling of the discharge gap between pulses, thermal stress on the machined surface is less and duty factors can be increased, resulting in higher accuracy and machining speed compared to the relaxation pulse generator. 相似文献
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Monitoring and control of the micro wire-EDM process 总被引:1,自引:1,他引:1
Mu-Tian Yan Hsing-Tsung Chien 《International Journal of Machine Tools and Manufacture》2007,47(1):148-157
A new pulse discriminating and control system has been developed for process monitoring and control in micro wire-EDM. The pulse discriminating and control system identifies four major gap states classified as open circuit, normal spark, arc discharge and short circuit based on the characteristics of gap voltage waveform. The effect of pulse interval, machining feedrate and workpiece thickness on the variations of the proportion of normal spark, arc discharge and short circuit in the total sparks (defined as normal ratio, arc ratio and short ratio, respectively) were investigated. It is found that a long pulse interval results in an increase of the short ratio under a constant feedrate machining condition. A high machining feedrate or an increase of workpiece height results in an increase of the short ratio. To achieve the stability of the machining operation, a control strategy is proposed by regulating the pulse interval of each spark in real-time according to the identified gap states. Experimental results indicate that the developed pulse discriminating and control system can significantly reduce the arc discharge and short sparking frequency as well as achieve stable machining under the condition where the instability of machining operation is prone to occur. 相似文献
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Tsuneo Kurita Kunio Chikamori Shinichirou Kubota Mitsuro Hattori 《International Journal of Machine Tools and Manufacture》2006,46(12-13):1311-1318
This paper presents an electrochemical micromachining (ECμM) system developed with a machining gap control system. As a preliminary, electrochemical machining (ECM) experiments are carried out. The optimum machining condition of ECM is determined in terms of machining voltage, machining pulse length, amplitude of the electrode for flushing out contamination, and electrolyte concentration. After the preliminary ECM experiments, three-dimensional shape micromachining is carried out under the optimum condition. First, a prismatic electrode with a 200-μm square as the base shape is machined by ECM. Next, three-dimensional shape micromachining is carried out by scanning the prismatic electrode. A three-dimensional shape with sub-millimeter range is successfully machined. 相似文献
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通过观测电火花放电现象对加工的影响,发现可控的双极性电火花加工能用更低的加工刀具磨损率获得比传统单极性电火花加工更高的材料去除率和效率,因此基于先进的电力电子技术,提出了一种双极性通用型电火花加工用脉冲电源,并给出相应的能量控制策略,还采用可提供连续正负脉冲输出的全桥电路作为该脉冲电源的主电路,并引入间隙电压和间隙电流的和作为唯一的控制量,在引弧阶段采用电压控制,在放电阶段采用电流控制。用一个电路完成放电间隙的击穿和放电能量的控制,减小脉冲电源系统的体积,同时在单个放电过程的各个阶段,对脉冲电压、放电电流、放电持续时间和消电离时间等参数进行合理灵活的调整,在维持放电频率一定的情况下,保证加工过程中单次放电能量的一致,从而实现高效均匀的电火花加工。 相似文献