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Coatings 2018, 8(1), 32; https://doi.org/10.3390/coatings8010032

Effect of Tip Shape of Frictional Stir Burnishing Tool on Processed Layer’s Hardness, Residual Stress and Surface Roughness

1
Industrial Division, Nikkiso Co., Ltd., 2-16-2 Noguchicho, Higashimurayama-shi, Tokyo 189-8520, Japan
2
Department of Mechanical Systems Engineering, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei-shi, Tokyo 184-8588, Japan
*
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 3 January 2018 / Accepted: 9 January 2018 / Published: 11 January 2018
(This article belongs to the Special Issue Manufacturing and Surface Engineering)
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Abstract

Friction stir burnishing (FSB) is a surface-enhancement method used after machining, without the need for an additional device. The FSB process is applied on a machine that uses rotation tools (e.g., machining center or multi-tasking machine). Therefore, the FSB process can be applied immediately after the cutting process using the same machine tool. Here, we apply the FSB to the shaft materials of 0.45% C steel using a multi-tasking machine. In the FSB process, the burnishing tool rotates at a high-revolution speed. The thin surface layer is rubbed and stirred as the temperature is increased and decreased. With the FSB process, high hardness or compressive residual stress can be obtained on the surface layer. However, when we applied the FSB process using a 3 mm diameter sphere tip shape tool, the surface roughness increased substantially (Ra = 20 µm). We therefore used four types of tip shape tools to examine the effect of burnishing tool tip radius on surface roughness, hardness, residual stress in the FSB process. Results indicated that the surface roughness was lowest (Ra = 10 µm) when the tip radius tool diameter was large (30 mm). View Full-Text
Keywords: friction stir burnishing; surface enhancement; residual stress; surface roughness; strain friction stir burnishing; surface enhancement; residual stress; surface roughness; strain
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Takada, Y.; Sasahara, H. Effect of Tip Shape of Frictional Stir Burnishing Tool on Processed Layer’s Hardness, Residual Stress and Surface Roughness. Coatings 2018, 8, 32.

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