Roller compression
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During roller compression the same kinematics is carried out as with burnishing. Hardened rollers are guided over the workpiece with pressure and displace the surface peaks into the boundary layer. The displaced material volume flows from below into the profile valleys rising up. Surface plateaus then result from the surface peaks, and these form the high contact area ratio of roller burnished surfaces.
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The objective of roller compression is to improve the strength properties.
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The rolling force produces internal stress in the micro-structure, which increase the dynamic strength of the material.
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The material state is formed up to a depth of 0.5 to 0.7 mm.
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The increase in strength is dependent on
- the rolling force,
- the geometry of the roller and workpiece,
- the material properties
- and the number of times the material is rolled over
