Mahalil, Khairuddin (2023) A study on the performance of burnishing process with dry, minimal quantity lubrication (MQL) and supercritical carbon dioxide (SCCO2) cryogenic cooling. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Burnishing is an important post-machining technique used to change surface roughness, microstructure, and mechanical characteristics. Proper cooling methods are required to improve product quality. One of the preferred cooling methods for the burnishing technique is cryogenic cooling. The cryogenic cooling system, has received less attention particularly in relation to the burnishing process. SCCO2 is employed as a cooling or cryogenic gas rather than a dry, small-quantity lubricant. The burnishing technique is used to improve a component's surface integrity, which is critical in the medical, aerospace and nuclear industries. It necessitates the use of proper cooling and lubricating systems most commonly flood cooling. The flood cooling method is unsafe to the working environment of burnishing process. As new cooling method that combines MQL and supercritical carbon dioxide (SCCO2) cryogenic cooling. Carbide burnishing tools with diameters of 10mm and 16mm and edge radius of 1 and 2 mm were used to burnish SS400 carbon steel. Dry and MQL cooling techniques were also used to assess performance under different cooling circumstances. SCCO2+MQL performance on the workpiece was demonstrated and all experiments meet the objectives. Smaller diameter for frictional stir burnishing is enhanced the tool wear progression, microhardness and surface roughness. The increasing quantity of lubricant that results from the SCCO2+MQL condition helps to reduce friction and cutting temperature, which in turn slows the course of tool wear and increases the tool's lifespan

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