INVESTIGATION AND MODELLING OF SURFACE ROUGHNESS DURING MILLING OF GJL-250 GRAY CAST IRON AND S235JR STEEL USING MIXED CERAMIC TOOLS

Hristo Radev; Hristo Yakimov; Irina Aleksandrova

doi:10.68302/std2026.vol2.18

Authors

Hristo Radev dept. Industrial technology and design Center of Competence “Smart Mechatronic, Eco-and Energy-Saving Systems and Technologies” , Technical University of Gabrovo, Gabrovo, Bulgaria https://orcid.org/0000-0003-4968-0820
Hristo Yakimov dept. Industrial technology and design Center of Competence “Smart Mechatronic, Eco-and Energy-Saving Systems and Technologies”, Technical University of Gabrovo, Gabrovo, Bulgaria https://orcid.org/0009-0001-9852-8422
Irina Aleksandrova dept. Industrial technology and design Center of Competence “Smart Mechatronic, Eco-and Energy-Saving Systems and Technologies” , Technical University of Gabrovo, Gabrovo, Bulgaria

DOI:

https://doi.org/10.68302/std2026.vol2.18

Keywords:

carbon structural steel, gray cast iron, milling, mixed ceramic tools, regression models, roughness

Abstract

Milling is one of the most common methods for processing flat surfaces, providing satisfactory accuracy and low surface roughness at high production rates. This paper presents the results of a study on the surface roughness of machined parts made of GJL-250 gray cast iron and S235JR carbon structural steel, obtained by milling with a single-tooth milling cutter with Al₂O₃/TiC mixed ceramic replaceable insert. Using the methods of the planned experiment and the multifactorial regression analysis, the combined influence of the cutting speed and the feed per tooth on the surface roughness has been evaluated, and corresponding adequate theoretical-experimental models have been constructed. Combinations of cutting speed and feed per tooth have been determined that result in minimum surface roughness on the machined surfaces for the two materials studied.

Supporting Agencies

This research was funded by the European Regional Development Fund within the OP "Research, Innovation and Digitalization Programme for Intelligent Transformation 2021-2027", Project CoC "Smart Mechatronics, Eco- and Energy Saving Systems and Technologies", No BG16RFPR002-1.014-0005.

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INVESTIGATION AND MODELLING OF SURFACE ROUGHNESS DURING MILLING OF GJL-250 GRAY CAST IRON AND S235JR STEEL USING MIXED CERAMIC TOOLS

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