A new method for monitoring micro-electric discharge machining processes

• Published in: International journal of machine tools & manufacture 2008-03, Vol.48 (3), p.446-458
• Main Authors: Mahardika, Muslim, Mitsui, Kimiyuki
• Format: Article
• Language: English
• Subjects: Applied sciences; Discharge pulses counting methods; Discharge pulses energy; Exact sciences and technology; Industrial metrology. Testing; Mechanical engineering. Machine design; Micro-electric discharge machining; Online monitoring; Tool electrode vibration
• ISSN: 0890-6955; 1879-2170
• DOI: 10.1016/j.ijmachtools.2007.08.023

Micro-electric discharge machining (μ-EDM) is a very complex phenomenon in terms of its material removal characteristics since it is affected by many complications such as adhesion, short-circuiting and cavitations. This paper presents a new method for monitoring μ-EDM processes by counting discharge pulses and it presents a fundamental study of a prognosis approach for calculating the total energy of discharge pulses. For different machining types (shape-up and flat-head) and machining conditions (mandrel rotation and tool electrode vibration), the results obtained using this new monitoring method with the prognosis approach show good agreement between the discharge pulses number and the total energy of discharge pulses to the material removal and tool electrode wear characteristic in μ-EDM processes. On applying tool electrode vibration, the machining time becomes shorter, because it removes adhesion. The effect of tool electrode vibration in order to remove adhesion can be monitored with good results. In order to achieve high accuracy, the tool wear compensation factor has been successfully calculated, since the amount of tool electrode wear is different in each machining type and condition. Consequently, a deeper understanding of the μ-EDM process has been achieved.