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UBC Theses and Dissertations

Thermo-mechanical investigation of die-less wiredrawing process Jafari, Hani


Wiredrawing process as a bulk forming process is one of the oldest manufacturing processes known. The rigid “Die”, which is the tool in the process, is responsible for the most of the cost of the process. In the “Die-less” wiredrawing, however, the die is replaced with a Heating-Cooling unit, which reduces the cost of the process significantly. The die-less wiredrawing process as a thermo-mechanical process consists of mechanically loading the wire or a rod along its longitudinal axis, and locally heating it to lower its yield strength; and thus, less force needed to pull and stretch the wire. The wire is cooled subsequently in order to stabilize dimension and recover its strength. In this study, the Mechanical Threshold Stress (MTS) model along with continuity equation and a heat transfer model are utilized to mathematically model the die-less wiredrawing process in the deformation zone. Numerical procedures are used to simulate the process in transient state and identify the main process parameters. From the results of this study, it was shown that is possible to model the process through semi-discretization of Partial Differential Equations (PDE), which govern the dynamic of the process. It was also shown that the process is highly sensitive to temperature and that the most important parameter in controlling the process in transition from unsteady to steady state is the deformation zone length.

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