A single-experiment method for coupled transient characterization of contact heat transfer and friction in glass molding

CIRP Annals, vol. 75, pp. 721–725

Abstract

In precision manufacturing of glass optics, friction and heat transfer at the contact interface critically influence forming accuracy but are difficult to quantify under transient thermo-mechanical conditions and identical surface states. This work presents a single-experiment method for the simultaneous determination of friction and contact heat transfer coefficients using a pin-on-cylinder tribometer combined with infrared thermography. Transient forces and surface temperatures are synchronously measured and evaluated by inverse thermo-mechanical modeling to identify interface coefficients. The approach is validated under stationary and sliding contact conditions and demonstrates improved reliability of the measured properties at elevated temperatures. The method enables reduced experimental effort and process-relevant characterization of coupled interface behavior in glass molding.

Authors 3

1. Thomas Bergs corresponding Aachen Fraunhofer Institute for Production Technology IPT Manufacturing Technology Institute (MTI)

   RWTH Aachen University · Fraunhofer Institute for Production Technology IPT

   Affiliation as printed

   Fraunhofer Institute for Production Technology IPT, Aachen, Germany

   Manufacturing Technology Institute (MTI) of RWTH Aachen University, Aachen, Germany

2. Anh Tuan Vu Aachen Fraunhofer Institute for Production Technology IPT

   Fraunhofer Institute for Production Technology IPT

   Affiliation as printed

   Fraunhofer Institute for Production Technology IPT, Aachen, Germany

3. Cornelia Rojacher Aachen Fraunhofer Institute for Production Technology IPT

   Fraunhofer Institute for Production Technology IPT

   Affiliation as printed

   Fraunhofer Institute for Production Technology IPT, Aachen, Germany