Impact of Ceramic Ball Burnishing Process on Surface Hardness and Residual Stress in SKD11
Keywords:
ceramic ball burnishing process, residual stress, surface hardness, SKD11Abstract
A ball burnishing process is a process of improving the physical properties of metal surface layers. The process enhances the surface hardness, internal residual stress, and surface roughness of the workpiece. Accordingly, it has been used in a wide variety of industrial applications, such as ship propeller manufacturing and mold manufacturing, to shorten production times and reduce damage.
The purpose of this research was to study the ball burnishing process of the SKD11 steel with a silicon nitride ceramic ball measuring 8 mm in diameter, the hydraulic oil pressure of 200, 400 and 600 bar, and the hardened depth of 0.3, 0.5 and 0.7 mm at the speed of 2000 mm/ min and the feed rate of 0.1 mm /rev. When the workpiece was examined for surface hardness, residual stress, surface roughness, area of the burnished surface.
The results revealed that both the hydraulic oil pressure and the hardened depth influenced the surface hardness of the workpiece. The average surface hardness was found to be related to the internal residual stress value, with a maximum value of 629.4 MHV or 57.8 HRC, achieved at a hydraulic oil pressure of 400 bar and a hardened depth of 0.5 mm, which is equivalent to the result of a heat treatment process. The surface roughness was within acceptable machining standards. The average surface hardness could be compared to the result of a treatment process. Moreover, this results in increased hardness and residual stress.
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