共查询到19条相似文献,搜索用时 156 毫秒
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日前,宁江集团研制出的具有先进水平的实用电火花小孔脉冲电源通过鉴定。针对电火花加工机床市场的发展和要求,公司产品实验室进行了SY0403-20A电火花小孔脉冲电源的研制。经过反复实验,成功地解决了该类产品最棘手的电源稳定性和可靠性问题,并扩大了电火花加工孔的规格,使其加工孔径可达8~10m m,加工效率也比原电火花机床提高50%,而加工后的小孔精度、表面粗糙也得到了一定的提高。经小批量生产及用户评定后,集团公司决定投入批量生产。(陈运发)宁江集团研发成功电火花小孔脉冲电源@陈运发 相似文献
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电火花加工是利用浸在工作液中的两极间脉冲放电时产生的电蚀作用蚀除导电材料的特种加工方法,又称放电加工或电蚀加工,英文简称EDM。一、电火花加工的发展回顾及基本工艺1943年,苏联学者拉扎连科夫妇研究发明电火花加工,之后随着脉冲电源和控制系统的改进,而迅速发展起来。最初使用的脉冲电源是简单的电阻-电容回路。50年代初,改进为电阻-电感-电容等回路。同时,还采用脉冲发电机之类的所谓长脉冲电源,使蚀除效率提高,工具电极相对损耗降低。随后又出现了大功率电子管、闸流管等高频脉冲电源,使在同样表面粗糙度条件下的生产率得以提高。… 相似文献
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《世界制造技术与装备市场》2005,(5):90-90
苏州电加工机床研究所针对航天、航空、军工制造业中大量难加工的深小孔电火花加工工艺及设备进行了研究。研究的主要内容:①根据孔加工表面质量要求高的特点,对电火化深小孔加工的电源参数、放电间隙检测、伺服进给控制、工作液冲液方式进行了深入系统的研究,找出了影响孔加工表面质量的主要因素及控制方法。②根据孔的加工精度要求研究了电极质量、电极侧面及端面损耗,加工中二次放电,脉冲电源的稳定性以及工作液压力、流量、温度、电导率的变化等一系列工艺条件对加工精度的影响程度及其控制策略。③根据孔空间位置复杂的要求,研制了多轴… 相似文献
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为满足设备小型化、便于携带的要求,研制了小型电火花加工脉冲电源.该脉冲电源采用单片机芯片产生宽度和间隔可调的脉冲,并控制步进电机的进给以保证加工间隙的稳定.实验和应用表明,该小型脉冲电源具有较好的稳定性和可靠性. 相似文献
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A micro rod machining method which can switch between electrical discharge machining (EDM) and electrochemical machining (ECM) by attaching/detaching a diode to/from a bipolar pulse generator in parallel to the working gap was newly developed using a wire electrode made of tungsten. The problem of the wire electrode wear was eliminated by the use of the wire electrochemical turning (WECT) method in which the tungsten wire electrode is continuously running. The ultra-short bipolar pulse current was generated by the electrostatic induction feeding method where a pulse voltage is coupled to the working gap through a feeding capacitance. The machining characteristics of three types of wire guide; disk-shaped WC guide, laminated wire guide and cylindrical acrylic guide, were studied. The experimental results showed that the cylindrical acrylic guide has the best machining characteristics without the influence of guide wear and with less stray current flowing through the working gap. Using the cylindrical acrylic guide, the influences of the feeding capacitance C1, and the total amplitude of the pulse voltage on the machining characteristics were studied. Finally, a stainless steel SUS 304 micro-rod with a high aspect ratio of 14 was fabricated efficiently by using the EDM and ECM modes for rough and finish machining in sequence with the same setup, pulse generator, and neutral electrolyte. 相似文献
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自适应型无阻高频脉冲电源的研究 总被引:2,自引:0,他引:2
采用双管正激交错并联结构设计输出电流连续可调的DC/DC变换器恒流源,主电路后级电路不用电阻限流,也不用电感限流,而是利用前级DC/DC变换器以及脉冲控制发生电路共同作用来控制后级电路中的加工电流。 相似文献
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Improvement of machining characteristics of micro-EDM using transistor type isopulse generator and servo feed control 总被引:9,自引:0,他引:9
This paper describes the improvement of machining characteristics of micro electrical discharge machining (micro-EDM) using a newly developed transistor type isopulse generator and servo feed control. The RC generator is mainly applied in conventional micro-EDM even though the transistor type isopulse generator is generally more effective for obtaining higher removal rate, because the transistor type generator is unable to generate iso-duration discharge current pulses with small pulse duration (several dozen nano-seconds), which is the normal level for micro-EDM. A new transistor type isopulse generator was therefore developed using a current sensor with high frequency response. With the new transistor type isopulse generator developed, the pulse duration can be reduced to about 30 ns, which is equivalent to the pulse duration used in finishing by the conventional RC pulse generator for micro-EDM. In order to achieve stable machining and improve machining characteristics, a new servo feed control system for micro-EDM using average ignition delay time to monitor the gap distance was also developed. By integrating the transistor type isopulse generator with this new servo feed control system, we were able to obtain a removal rate of about 24 times higher than that of the conventional RC pulse generator with a constant feed rate in both semifinishing and finishing. The effectiveness of the servo feed control proved higher in finishing than in semifinishing, whereas the transistor type isopulse generator was more effective in semifinishing than in finishing. 相似文献
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复合运丝型电火花线切割加工参数分析与研究 总被引:1,自引:0,他引:1
提出了一种新型电火花线切割机床,即电极丝作往复直线运动的同时还绕自身轴线高速旋转的复合运丝型线切割机床。介绍了该类机床与其他线切割机床加工的基本工艺指标。通过与高速走丝电火花线切割机床比较实验,分析了脉冲宽度、脉冲间隔、脉冲峰值电流等电参数对加工工艺指标的影响,实验表明这种独特的复合运丝方式在降低表面粗糙度、提高加工精度等方面较传统运丝方式具有较大的优越性,且机床结构较为简单,对于各种工艺参数和电参数具有更加广泛的适用性,具有进一步研究和推广价值。 相似文献