Showing papers on "Roller burnishing published in 2000"

An Investigation into Roller Burnishing

Abstract: Burnishing, a plastic deformation process, is becoming more popular as a finishing process: thus, how to select the burnishing parameters to reduce the surface roughness and to increase the surface microhardness is especially crucial This paper reports the results of an experimental program to study the influence of different burnishing conditions on both surface microhardness and roughness: namely, burnishing speed, force, feed, and number of passes Also, it reports the relationship between residual stress and both burnishing speed and force The residual stress distribution in the surface region that is orthogonally burnished is determined using a deflection etching technique Mathematical models are presented for predicting the surface microhardness and roughness of St-37 caused by roller burnishing under lubricated conditions Variance analysis is conducted to determine the prominent parameters and the adequacy of the models From an initial roughness of about Ra 45 μm, the specimen could be finished to a roughness of 05 μm It is shown that the spindle speed, burnishing force, burnishing feed and number of passes have the most significant effect on both surface microhardness and surface roughness and there are many interactions between these parameters The maximum residual stress changes from tensile to compressive with an increase in burnishing force from 5 to 25 kgf With a further increase in burnishing force from 25 to 45 kgf, the maximum residual stress increases in compression

Corrosion fatigue behavior of the high-strength magnesium alloy AZ 80

Abstract: The fatigue performance of the high-strength magnesium alloy AZ 80 is studied in air as well as in aqueous 0.5 and 3.5% NaCl solutions. The effect of mechanical surface treatments, specifically mechanical polishing, shot peening, and roller burnishing on the S-N curves, is investigated using an electropolished surface as a reference. While mechanical polishing as well as shot peening improves fatigue performance in air, no improvement is observed in NaCl solutions. However, roller burnishing, which combines a smooth surface finish with residual compressive stresses in sufficient depths, leads to outstanding fatigue performance even in 3.5% NaCl solution.

Finishing of Internal Surface of Stainless Steel Cylinders by a Roller Burnishing Tool. Study of Optimal Burnishing Condition.

Abstract: Roller-burnishing is one of the post-machining methods employed to finish the machined surface. The increase of fatigue life, hardness and reliability of a machined surface are achieved easily by the method. This paper discusses with the affect of burnishing conditions on the pre-machined surface and the influence on subsequent roller-burnishing process. The finishing experiments was conducted on internal surface of small diametral cylinder of SUS 304 with various burnishing conditions. The experimental results are described and the optimal burnishing conditions are discussesed. The finishing surface roughness less than 0.5 μmRy could be obtained easily by the roller-burnishing method in optimal burnishing condition.