Abstract
The objective of this research aims to improve surface roughness of the hardened 145Cr6 (DIN) steel using the hydrostatic burnishing tool. The ball burnishing process with hydrostatic tools is very economical finishing process for various types of machine parts. This process reduces the height of surface unevenness, introduces compressive stresses at high depth (approx. 1 mm) and increase the hardness of the surface layer. The flat surface optimal ball burnishing parameters have been determined after conducting the Taguchi L9 matrix experiment. The input parameters are speed, burnishing force and burnishing width. It also showed a positive effect of hydrostatics burnishing on roughness and geometric structure of the surface. In most cases, the result is anisotropic surface, reduced roughness, reduced amplitude values of parameters such as: Sa, Sz.
Highlights
Hard machining is usually defined as the process in which part pieces with hardness value over 45 HRC, but more typically in the range of 58-68 HRC are machining specially prepared tools
The analysis of means based and signal to noise (S/N) ratio was performed to decide the optimal levels of burnishing factors; the summary is presented in table 3
The effect of burnishing force, speed and width were studied on surface roughness
Summary
Hard machining is usually defined as the process in which part pieces with hardness value over 45 HRC, but more typically in the range of 58-68 HRC are machining specially prepared tools. Hard machining is a specific process performed under unique thermo-mechanical and technological conditions were plastics deformation, heat generation and tool wear differ substantially from those observed in machining “soft” materials. Burnishing is a cold working process in which plastic deformation occurs by applying pressure through a ball or roller on metallic surfaces. The principle of burnishing is shown on figure 1. It is a finishing and strengthening process. The burnishing process is an attractive finishing technique which can raise the strength of the surface of a workpiece as well as reduce its surface height [1,2,3]
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