Influence of Lubricants on Coefficient of Friction in Tube Hydroforming

  • S. P. Rudraksha
  • S. H. GawandeEmail author


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.


Tube hydroforming (THF) Coefficient of friction (COF) Lubricants 



Initial wall thickness (mm)


Wall thickness at the side of movable punch (mm)


Wall thickness at the side of fixed punch (mm)


Initial outer diameter of the tube (mm)


Initial inner diameter of the tube (mm)


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


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


Initial height of tube (mm)


Final height of tube after deformation (mm)


Strength coefficient


Strength hardening exponent


Inner pressure of tube


Initial tube thickness


Coefficient of friction



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

Compliance with Ethical Standards

Conflict of interest

The authors declare that there is no conflict of interests regarding the publication of this paper.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Mechanical Engineering Department, P.E.S Modern College of EngineeringS. P. Pune UniversityPuneIndia
  2. 2.Industrail Tribology Laboratory, Mechanical Engineering Department, M.E.S. College of EngineeringS. P. Pune UniversityPuneIndia
  3. 3.Mechanical Engineering Department, Trinity College of Engineering and ResearchS. P. Pune UniversityPuneIndia

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