期刊
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
卷 117, 期 3-4, 页码 949-960出版社
SPRINGER LONDON LTD
DOI: 10.1007/s00170-021-07736-6
关键词
Titanium alloy; EDM; Discharge ablation process; Mixed-gas atomized medium; Single pulse; Microcosmic mechanism
资金
- National Natural Science Foundation of China [51705040, 51975290]
Experimental investigation of the titanium alloy die-sinking mixed-gas atomization discharge ablation process revealed four stages of micro-erosion process, and theoretical analysis showed the violent exothermic oxidation reaction between high-temperature melting material and oxygen medium introduced external chemical energy to achieve high particle removal power.
In order to reveal the microscopic mechanism of the titanium alloy die-sinking mixed-gas atomization discharge ablation process (MA-DAP), a single-pulse discharge test was performed using a needle electrode discharge device. According to the step-like characteristic of the single discharge waveform, the micro-erosion process could be divided into four stages: preparation for oxidation ablation; oxidation occurrence and oxide layer generation; oxidation-ablation dynamic balance and oxide layer prototype formation; and oxidation-ablation termination and integral oxide layer formation. Theoretical analysis showed that the violent exothermic oxidation reaction between the oxygen medium and the high-temperature melting material introduced a large quantity of external chemical energy into the sparking region. Fast vaporization and explosion of the atomized medium after heating gave MA-DAP high particle removal power. The technological experimental results showed MA-DAP provides high material removal efficiency and strong deep-hole machining ability. The depth-to-diameter ratio of the specially shaped titanium alloy MA-DAF blind hole was 11 times that from traditional electrical discharge machining, while the cross-sectional hardness can be reduced by 45%.
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