The process of making the clutch sleeve for starter motors was discussed and the most difficult and final stage of backward extruding a preformed billet to produce the sleeve was examined experimentally. The conventional zinc phosphate/sodium stearate lubricant and six other cold-forming lubricants were applied to vary friction conditions at the tool/workpiece interfaces.
The final stage was then analysed and the predicted variation of the reduced stress, the mean forming load as well as the length of the extruded part were presented against the punch movement for various frictional conditions. The predicted results were compared with the experimental results and a close agreement was observed.
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References
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PragerW.HodgeP. G.JrTheory of perfectly plastic solids, 1951, pp 237 (Chapman and Hall, London).
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AbdulN. A.(Submitted by Alexander, J. M.) Friction determination during bulk plastic deformation of metalsResearch Annals of the C.l.R.P, 1981, 30(1), 143–146 (International Institute for Production Engineering).
