A New Experimental Technique for the Measurement of Mean Coefficient of Friction in the Direct Drawing of Section Rod From Round Bar

Summary

In the direct drawing of section rods from round bar, the measurement of the mean coefficient of friction ‘μ’ is necessary for the investigation and optimization of the processes, and also for the checking of the correctness of theoretical solutions obtained /1/.

However, owing to the geometrical complexity of the die deforming zone, existing well-known experimental techniques such as die rotation HI technique and split die methods /4/ are impractical.

In this paper, a unique design of a split-rotating die was developed by the author. It provides a continuous and direct measurement of both the mean coefficient of friction and mean die pressure. For the direct drawing of section rods results obtained from this technique showed good agreement with results derived from a semi- analytical method /2/.