气体压力对钛合金电火花诱导烧蚀加工的影响

doi:10.7527/S1000-6893.2014.0165

Abstract

Abstract:

In the electrical discharge machining (EDM) ablation process, the oxygen take an important role in the process of oxidation heat, metal corrosion and cooling. Investigation on the effect of gas pressure on improving the gas flow rate, decreasing the molecular mean free path of gas, improving the oxidation diffusion velocity, accelerating the energy dissipation is carried out. Breakdown voltage, the breakdown delay and working voltage under different gas pressure is tested, results show that breakdown voltage and breakdown delay characteristics is greatly influenced by gas pressure. Machining equivalent model of EDM ablation is established to prove that the change of working voltage is caused by the oxidation of the surface of electrode and workpiece. Influence of gas pressure on the material removal rate (MRR), relative electrode wear rate (REWR) and surface roughness in the EDM ablation is studied. The results show that with the increase of gas pressure, material removal rate increases firstly and then decreases, relative electrode wear decreases slowly and the surface roughness is significantly improved.

Key words: electrical discharge machining, ablation, titanium alloy, gas pressure, oxygen diffusion

CLC Number:

WANG Xiangzhi, LIU Zhidong, QIU Mingbo, TIAN Zongjun, HUANG Yinhui. Influence of Gas Pressure on EDM Ablation of Titanium Alloy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(12): 3480-3488.

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Influence of Gas Pressure on EDM Ablation of Titanium Alloy

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