발포알루미늄의 와이어 컷 방전가공 특성
Process characteristics of porous aluminum by wire-cut EDM
발포알루미늄 와이어컷 방전가공 경량화 기계제작 기계항공공학;
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In this study, the characteristics of aluminum alloys under the wire-cut EDM(Electical Discharge Machining)process. Besides 2 series and 7series of aluminum alloys for aerospace applications, porous aluminum is tested, which is used for sound absorbing material and interior and exterior material of building. Jinyoung JW-30 wire cutting machine was used in this experiment. Tap water passed a filter and ionization was used as the discharging solution. An immersion method was applied as a cooling method because it separates chips effectively and machinability is good even with low value of electric current. The shower of discharging solution was applied both top and bottom of the specimen with pressure of 10 kg/㎤, and 0.25 mm brass wire was use as electrodes the gap between specimen and electeodes was 0.1mm, tension of wire was 15 kgf, feed rate of wire was 13 m/min and conduction was 20±1(㎲/cm) The speed of fabrication was estimated by measuring the travel distance of the work piece and time spent for the movement. As test variable, pulse-on-time(PA=4, 5, 6), peak voltage or main power supply voltage(V=14, 15, 16), and peak current (Ip=13, 14, 15) were applied. The main foundings from these experiments are as follows. 1. As pulse-on-time increased the fabrication speed decreased. On the other hand, as peak voltage or peak current increased the fabrication speed increased. In general 7075 aluminum alloy resulted in higher fabrication speed. 2. With fixed peak current and pulse-on-time, the fabrication speed increased as the peak voltage increased. 3. When peak voltage and pulse-on-time were fixed and peak current was increased, the fabrication speed decreased. 4. Pulse-on-time was increased(PA=7, 9, 11), while peak voltage(16 V) and peak current (18 Ip) were fixed. In this condition, fabrication speed remained about 2.8 mm/min with porous aluminum. However with 7075 aluminum, the wire was cut for pulse on time higher than 9, thus fabrication was not possible.
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