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空化作用和流动现象对于超声波辅助电火花腐蚀解决沉孔加工的困难来说是有兴趣的,这在下面将详尽地加以解释。 液体作超声波振动时,由于声波强的原因会在振动的伸张期出现液体的“撕裂”现象,同时液体的内聚力被克服。这种作用特别出现在小气泡处或尘埃颗粒处(空化作用开始形成)。液体被撕裂时形成成百万个微观的极小空腔,这些小空腔充满稀薄的液蒸气或气体,并能够凝结成直至到可见的尺寸(约0.1mm)。在紧接着的压缩期这些空化作用的小气泡变得不稳定并自身萎缩。在这些小气泡破碎时会形成强烈的液体动力学的激励,由此产生具有高能量密度的强有力的微冲
Cavitation and flow phenomena are of interest for the ultrasonic-assisted spark erosion solution to counterbore machining difficulties, as explained in more detail below. When the liquid is subjected to ultrasonic vibration, the “tearing” of the liquid occurs during the stretching of the vibration due to the strong sound waves, and the cohesion of the liquid is overcome. This effect occurs particularly at small air bubbles or dust particles (cavitation begins to form). When the liquid is torn, millions of microscopic cavities are formed which are filled with thin liquid vapors or gases and are able to condense up to a visible size (about 0.1 mm). These cavitations of small bubbles become unstable and contract themselves during the ensuing compression phase. A strong hydrodynamic stimulus is created when these small bubbles break, thereby creating a powerful micro-punch with high energy density