Surface operations by "Cold Working" are applied in order to:

1. Improve the surface finish,
2. Improve the fatigue life,
3. Improve the size control.

The basic idea of the methods is plastic deformation of material by applying a relatively small force so that a hardened layer on the surface exists. Roller Burnishing, Shot Peening, LPB (Low Plasticity Burnishing) are such methods.
If relatively small force is applied using a highly polished roller, which has the translation and rotation actions it will follow a path through the metal surface. This case is called Roller Burnishing operation.

INTRODUCTION

Roller Burnishing has been studied in the USSR and Japan, and applied most extensively in the USSR in the 1970's. Improvements in high cycle fatigue, corrosion-fatigue and stress corrosion cracking are documented. Optimum rolling parameters were established to minimize roughness and/or maximize surface hardening
Models have been developed to predict the residual stresses from the deformation process in England and in France.

The production of ROBUTO - Roller Burnishing Tool, in Turkey was started in 1985 for inner and external diameters. According to the theoretical basis, today different applications are developed and studied by YAMATO. Special designs are made for the Industry.

ROLLER BURNISHING

The principle of Roller Burnishing is transferring the force applied on a roller to the surface in a certain path. During the rotation action the contact area is so small that hertz type pressure occurs on material surface (like roller bearings). This provides low energy and rolling force requirement. Roller Burnishing a metal surface is only possible with specially designed rollers and mandrel - roller combinations.