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Influence of Lubricants on Coefficient of Friction in Tube Hydroforming

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Abstract

In this paper, the effect of different lubricants on coefficient of friction in tube hydroforming using mathematical model is presented. To determine the minimum coefficient of friction in tube hydroforming, a mathematical model is used based on tube upsetting method. The presented models uses the given geometrical parameters of the tube to estimate optimized inner pressure (pi) and optimized initial thickness of the tube (S0) obtained from the mathematical model. Using optimized inner pressure (pi) and optimized initial thickness of the tube (S0), minimum COF (µ) between tube and die interface is determined. Experiments are carried out on manufactured component metal expansion bellows using different geometrical parameters, materials SS304, SS316 and SS316L with lubricants Enklo68, Enklo47, Enklo32, Enklo100 and ethylene glycol. The influence of these lubricants on COF for each material is investigated.

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Abbreviations

S 0 :

Initial wall thickness (mm)

S1 :

Wall thickness at the side of movable punch (mm)

S2 :

Wall thickness at the side of fixed punch (mm)

da:

Initial outer diameter of the tube (mm)

di:

Initial inner diameter of the tube (mm)

di1:

Final inner diameter of the tube at the side of movable punch (mm)

di2:

Final inner diameter of the tube at the side of fixed punch (mm)

h0 :

Initial height of tube (mm)

h:

Final height of tube after deformation (mm)

C:

Strength coefficient

n:

Strength hardening exponent

pi:

Inner pressure of tube

S0 :

Initial tube thickness

µ:

Coefficient of friction

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This work is not supported fully or partially by any funding organization or agency.

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Authors and Affiliations

  1. Mechanical Engineering Department, P.E.S Modern College of Engineering, S. P. Pune University, Pune, India

    S. P. Rudraksha

  2. Industrail Tribology Laboratory, Mechanical Engineering Department, M.E.S. College of Engineering, S. P. Pune University, Pune, India

    S. H. Gawande

  3. Mechanical Engineering Department, Trinity College of Engineering and Research, S. P. Pune University, Pune, India

    S. P. Rudraksha

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  1. S. P. Rudraksha
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  2. S. H. Gawande
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Correspondence to S. H. Gawande.

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Rudraksha, S.P., Gawande, S.H. Influence of Lubricants on Coefficient of Friction in Tube Hydroforming. J Bio Tribo Corros 6, 14 (2020). https://doi.org/10.1007/s40735-019-0309-6

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