Acoustic emission investigations into electrical discharge machining

放电加工的声发射研究

• 批准号: 249631-2009
• 负责人: Koshy, Philip
• 金额: $ 1.82万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=524730
• 关键词: Acoustic; emission; investigations; into; electrical

Electrical discharge machining (EDM) is a precision material removal process that utilizes the heat generated from rapid (~20-100 kHz) spark discharges between the tool and the workpiece that are separated by a small gap filled with a dielectric fluid. A single discharge entails 4 distinct stages: (1) application of a voltage between the tool and the workpiece, (2) dielectric breakdown leading to plasma formation, (3) discharge between the tool and the workpiece leading to the flow of a current resulting in melting and vaporization of both the tool and the workpiece, and (4) implosion of the plasma channel that ejects material off the molten pool, followed by flushing and solidification of the molten particles. The physics involved in the gap phenomena above are rather complex and currently not well understood. In this context, the proposed research program seeks to develop a simple but novel approach to investigate acoustic emission (AE) in EDM.

放电加工 (EDM) 是一种精密材料去除工艺，利用工具和工件之间快速 (~20-100 kHz) 火花放电产生的热量，工具和工件之间由填充有介电流体的小间隙隔开。单次放电需要 4 个不同的阶段：(1) 在工具和工件之间施加电压，(2) 介电击穿导致等离子体形成，(3) 工具和工件之间放电导致产生电流工具和工件的熔化和汽化，以及（4）等离子体通道的内爆，将材料从熔池中喷射出来，然后熔融颗粒的冲洗和凝固。上述间隙现象所涉及的物理学相当复杂，目前还没有被很好地理解。在此背景下，拟议的研究计划旨在开发一种简单但新颖的方法来研究 EDM 中的声发射 (AE)。