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<p>Due to the inherent non-uniformity in the composition and properties of network microstructure titanium matrix composites (NMTMCs), significant instability is observed during the electrical discharge machining (EDM) process. In this study, Box–Behnken experimental designs are employed to investigate the effects of electrical parameters, which reveals a key distinction: in finish machining, the material removal rate (MRR) remains nearly constant as the pulse interval increases, in contrast to the trend observed in rough machining, where MRR initially increases and then decreases. Comparative experiments on NMTMCs and Ti6Al4V show that short circuits occurring in regions enriched with reinforcement phases significantly deteriorate machining performance under short pulse intervals. Furthermore, the matrix regions cannot be efficiently machined at long pulse intervals due to the reduced discharge frequency. Accordingly, a composite pulse power supply is proposed. By adjusting the pulse interval based on real-time monitoring of the discharge state, this power supply effectively improves both MRR and surface quality. When applied to the EDM of micro turbines, the proposed system reduced the processing time by 16.9% during finish machining.</p>

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Enhancing performance in micro-EDM for network microstructure titanium matrix composites utilizing composite pulse power supply

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Yizhou Hu,
  • Zhaoliang Liu,
  • Leheng Zhang,
  • Sirui Gong,
  • Zhenlong Wang

摘要

Due to the inherent non-uniformity in the composition and properties of network microstructure titanium matrix composites (NMTMCs), significant instability is observed during the electrical discharge machining (EDM) process. In this study, Box–Behnken experimental designs are employed to investigate the effects of electrical parameters, which reveals a key distinction: in finish machining, the material removal rate (MRR) remains nearly constant as the pulse interval increases, in contrast to the trend observed in rough machining, where MRR initially increases and then decreases. Comparative experiments on NMTMCs and Ti6Al4V show that short circuits occurring in regions enriched with reinforcement phases significantly deteriorate machining performance under short pulse intervals. Furthermore, the matrix regions cannot be efficiently machined at long pulse intervals due to the reduced discharge frequency. Accordingly, a composite pulse power supply is proposed. By adjusting the pulse interval based on real-time monitoring of the discharge state, this power supply effectively improves both MRR and surface quality. When applied to the EDM of micro turbines, the proposed system reduced the processing time by 16.9% during finish machining.