Evaluation of an Experimental Setup Developed For Measuring the Friction Coefficients

Öz

Abstract - In the presented study, an experimental setup was developed in order to measure the friction coefficient and examine

the material flow during upsetting. A grid pattern was printed on the side and upper surfaces of ring shaped test specimen, and

photos of the final positions of the grids were taken for different upset ratios. Grid deformation views and the standard procedure

for friction coefficient determination were used in the analysis of the ring-compression test results. Two different test materials

were upset to different ratios in the tests and the friction coefficients for unlubricated conditions were determined. The friction

coefficients are harmonious with similar test results as expected. Variation in the grid dimensions with respect to deformation ratios

offer a better analysis for the ring deformations.

Anahtar Kelimeler

• Friction,Ring - compression,deformation

Kaynakça

1. [1] Male AT, Cockroft MG. “A method for the deformation of coefficient of friction of metals under bulk plastic deformation”. J Ins Met 1964– 1965;93:38–46. [2] Koboyashi S. “Deformation characteristics and ductile fracture at 1040 steel in simple upsetting of solid cylinders and rings”. ASME Paper 69-WA/Prod-14 1–8; 1970. [3] Lange K. “Handbook of metal forming”. USA: McGraw-Hill International Book Company; 1985. [4] Dieter GE. “Mechanical metallurgy. second ed”. Japan: McGraw-Hill International Book Company; 1984. [5] Sahin M, Cetinarslan CS, Akata HE; “Effect of Surface Roughness on Friction Coefficients During Upsetting Processes for Different Materials”, Materials & Design 28 (2): 633-640 2007 [6] Rajesh E, SivaPrakash M., “Analysis of friction factor by employing the ring compression test under different lubricants” International Journal of Scientific & Engineering Research, Volume 4, Issue 5, 1163-1170, May-2013 1163 ISSN 2229-5518