Improving the workability of materials during the dieless drawing processes by multi-pass incremental deformation
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(2020) 20:86
ORIGINAL ARTICLE
Improving the workability of materials during the dieless drawing processes by multi‑pass incremental deformation Andrij Milenin1 · Tsuyoshi Furushima2 · Peihua Du2 · Valeriy Pidvysots’kyy3 Received: 6 February 2020 / Revised: 22 June 2020 / Accepted: 6 July 2020 © The Author(s) 2020
Abstract The paper explores the new method of improving the workability of materials in the dieless drawing processes. The proposed method is based on the implementation of a multi-pass incremental deformation. Moreover, in each pass, strain and strain rate sensitivity of flow stress should be positive and significant. An approach based on the finite element calculation of instability coefficient of plastic deformation and simultaneous modeling of material ductility were applied for prediction of the workability. Two dieless drawing processes have been investigated. The difference was related to the heating system—induction heating and laser heating. FE simulations and experimental tests for three materials, two magnesium alloys (MgCa0.8 and MgNi19) and pure copper were performed. It was shown that the most effective increase in workability by multi-pass deformation can be achieved using laser dieless drawing. This is possible due to the shorter heating area and, as a consequence, the larger strain rate, which leads to better stability of the deformation process. Keywords Magnesium alloys · Dieless drawing · Ductility · Incremental deformation · Multi-pass deformation
1 Introduction The process of dieless drawing is a stretching of the workpiece with its simultaneous local heating. Weiss and Kot [1] presented a first study of the wire production based on this method. Tiernan and Hillery [2] performed a theoretical analysis and FE simulation of a dieless drawing of steel wire. They confirmed that during the dieless drawing, there is a complex interdependence between the process parameters. * Andrij Milenin [email protected] Tsuyoshi Furushima [email protected]‑tokyo.ac.jp Peihua Du [email protected] Valeriy Pidvysots’kyy [email protected] 1
Department of Applied Computer Science and Modelling, AGH University of Science and Technology, Mickiewicza 30, 30‑059 Kraków, Poland
2
The University of Tokyo, Komaba 4‑6‑1, Meguro, Tokyo 153‑8505, Japan
3
Institute for Ferrous Metallurgy, ul. K. Miarki, 12‑14, 44‑100 Gliwice, Poland
Currently, dieless drawing is widely used for the forming of various categories of products and materials. The application of this method for the production of tubes of the complex cross-section was investigated by Furushima et al. [3]. Tiernan et al. [4] showed an application of the dieless drawing for the deformation of bars. The heating source in the dieless drawing process is usually an electric furnace, an inductor, or a laser beam. In the latter case, the process is called laser dieless drawing and it was described by Li et al. [5]. The dieless drawing allows for elongation of the workpiece without using a deforming die and has several other advantages. For e
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