A cutting mechanism map for machining metallic sheets using electric current pulses. (8th June 2020)

• Record Type: Journal Article
• Authors: Tan, Peiyu; Kumar, Praveen; Dutta, Indranath
• Is Part Of: Engineering research express. Volume 2:Number 2(2020)
• Publication Date: 2020-06-08
• Subjects: cutting mechanism map -- thin sheets -- machining -- electric-pulse induced cutting (EPIC); Engineering -- Periodicals; 620.005
• DOI: 10.1088/2631-8695/ab9878
• Languages: English
• ISSNs: 2631-8695

Abstract

Abstract: We describe a tool-less and free-form manufacturing process for cutting metallic sheets by extending an initial cut by passing a series of electric current pulses. As the electric current reverses its direction across a sharp cut, an electromagnetic force is generated that tries to open the initial cut. The reversal of electric current around the cut also results in current crowding at the cut-tip, thereby concentrating Joule heating in the vicinity of the cut-tip. The self-induced electromagnetic force works in tandem with the concentrated Joule heating at the cut-tip, resulting in extension of the initial cut by a finite amount upon passing an electric pulse. The cut grows parallel to the initial orientation via one of the three mechanisms, namely sharp crack extension, blow-hole formation and formation of elongated hole with buckled edges, depending on the current density and the temperature. A detailed cutting mechanism map has been developed that can be used for selecting proper parameters for electro-pulse induced cutting for obtaining desired cut profile. This work paves path for realization of a unique methodology for machining hard-to-cut conducting materials.