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RISS 인기검색어
- 검색키워드
- 저자 : Wansheng Zhao (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Adaptive control for small-hole EDM process with wavelet transform detecting method
Yi Jiang,Wansheng Zhao,Xuecheng Xi,Lin Gu 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.6
To achieve an efficient small-hole EDM process, an accurate pulse monitoring strategy and a precise control are both required. In order to improve the efficiency and stability of the small-hole drilling process, an adaptive control system with a self-tuning regulator is developed. A high-speed EDM pulses monitoring system based on wavelet transform is implemented to measure the gap status, whose output is adopted as the feedback signals of the adaptive control system. The discharge waveforms are recorded and analyzed. The experimental results demonstrate that the arc pulse ratio during small-hole drilling process is reduced remarkably. The machining efficiency as well as the machining quality is improved significantly.
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Precision machining of high aspect-ratio rotational part with wire electro discharge machining
Yingmou Zhu,Tongsheng Liang,Lin Gu,Wansheng Zhao 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.3
Precision and micro rotational parts are widely used in various industries, such as micro probes for medical instruments, contact pins for micro assembly applications, micro electrodes for micro Electrical discharge machining (μ-EDM) or micro Electro-chemical discharge machining (μ-ECDM). In this research, a uniform annular area layer by layer feeding strategy was proposed to fabricate high aspect ratio, small radii rotational components on a conventional Wire electrical discharge machining (WEDM) machine equipped with an auxiliary spindle. The uniform annular area layer by layer feeding strategy consisted of the roughing and finishing stages. First, the theoretical Material removal rate (MRR) and radial infeed rate for each layer were determined for the roughing stage, and the theoretical surface roughness, R z in the finishing stage was researched. Then, a series of optimization experiments were conducted to investigate the influence of the parameters on MRR and the machined surface roughness. A group of pin electrodes were machined by applying this feed strategy with the optimized parameters, and the minimum diameter of the pin electrodes was 40 μm with an aspect-ratio of 60. Finally, micro electrodes for an injection nozzle were achieved with this novel process and a qualified injection nozzle for powder metallurgy was fabricated with the machined micro electrodes.
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Yi Jiang,Linglei Kong,Jianfeng Yu,Chunjian Hua,Wansheng Zhao 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12
The present describes a porous electrode for electrical discharge machining (EDM) that can decrease the concentration of corrosion products in the discharge gap. The electrode is prepared by high-temperature sintering of copper particles. A large number of red copper particles become connected together through sintering necks to form a structure with a large number of pores that act as flushing channels. By exploring the preparation method, material, sintering temperature, and holding time, a porous electrode is prepared such that copper particles do not fall off during the discharge process. The flow of the flushing medium is simulated in the porous electrode, and the action of the flushing flow field in the discharge gap on erosion products is identified. In agreement with the simulation results, experimental results for the EDM of the titanium alloy Ti6Al4V show that the material removal rate with a porous electrode is 3 times higher than that for traditional EDM with a solid electrode. Moreover, the electrode wear is lower due to the effective discharge of the corrosion products by the flushing liquid. Experimental results when rough machining a complex semi-closed cavity show that the porous electrode can greatly shorten the machining time by 47 %, which demonstrates that a porous electrode improves the machining of a complex cavity in a titanium alloy.
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