Cryogenic machining, surface integrity and machining performance
Kopač, Janez, 1949- ; Pušavec, Franci ; Krolczyk, Grzegorz M.
Purpose: Of this paper is to present state-of-the-art on cryogenic machining and delivery principles of liquid nitrogen to the machining/cutting zone. Additionally, the influence of ...cooling/lubrication conditions on the surface integrity, generated during turning of Inconel 718, are analysed and presented. Design/methodology/approach: Of the paper are to present the design of the cryogenic machining system and how the liquefied nitrogen is delivered to the cutting zone. Additionally, the system is used to evaluate the effect on surface integrity of machined Inconel 718 workpiece. Methodologies used for the surface integrity evaluation are: electro-polishing, X-ray diffraction and micro indentation hardness measurements, with the approach to evaluate the extent of cryogenic influence on machined surface. Findings: The results show that the cryogenic machining process generates larger compressive residual stresses, and prevail at deeper levels beneath the machined surface, thus resulting in improved product quality and performance characteristics in terms of fatigue life and wear resistance. Research limitations/implications: The solutions of the delivery and the evaluation results have been all performed for the turning process, while there is still a challenge for the implementation of findings on the milling and drilling process kinematics. Practical implications: Work shows that cryogenic machining is capable of improving surface integrity and with this, as practical implication, having high potential for improving the sliding conditions, fatigue life of the final product, corrosion resistance, etc. Originality/value: Originality of the paper is shown by novel solutions (patents) on cryogenic machining system (delivery) and in machined surface modification capabilities with alternative cooling/lubrication fluid.
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