EXPERIMENTAL STUDIES ON APPLYING CRYOGENIC COOLING BEFORE HARD TURNING OF 100CR6 (AISI 52100)

Irina BEȘLIU, Ioan TAMAȘAG, Laurențiu SLĂTINEANU

Abstract


Turning of hard materials is considered an efficient finishing process, capable of replacing grinding and offering multiple advantages, such as reducing machining costs, increasing productivity and improving surface texture. A full factorial experimental design (DOE) was used to analyze the correlation between input factors — cutting medium (dry and cryogenic), cutting speed and feed — and certain parameters of interest, such as cutting forces and surface quality. The material investigated is a high-carbon and chromium steel, commonly used for the manufacture of bearings, subjected to a heat treatment to obtain a hardness of 61±2 HRC. The study highlights that cryogenic turning, at approximately −30°C, improves the process performance, generating shorter and more fragmented chips due to the embrittlement effect of the material. Also, the surface roughness obtained under cryogenic conditions was better, and although the cutting forces are slightly higher, the overall performance of the process improved significantly by comparation to dry cutting.

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References


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