Showing papers on "Roller burnishing published in 1973"
Patent•
08 May 1973
TL;DR: In this paper, a mandrel is constructed in a way whereby it not only creates a surface against which the rollers are pressed but is also fashioned to periodically force the rolling surface to be processed so as to peen the surface and also to press against the surface during another part of their rotation about the mandrel.
Abstract: A roller burnishing tool having a series of processing rolls mounted in a cage which rolls are actuated radially outward or radially inward as the case might be, the rollers operating against a work piece. The mandrel is constructed in a fashion whereby it not only creates a surface against which the rollers are pressed but is also fashioned to periodically force the rollers against the surface to be processed so as to peen the surface and also to press against the surface during another part of their rotation about the mandrel.
2 citations
TL;DR: The results of wear resistance tests showed that nitrided steel 40G14N9Kh3YuF2 is not inferior to steel 38KhMYuA, which has a fairly high wear resistance after nitriding as discussed by the authors.
Abstract: 1.
Precipitation-hardening nonmagnetic steels of the Fe−Mn−Ni system can be surface hardened by nitriding and also by work hardening of the surface. Surface layers with an elevated hardness to a depth of 0.3 mm can be obtained by nitriding of high-strength nonmagnetic steel 40G14N9Kh3YuF2. The results of comparative wear resistance tests showed that nitrided steel 40G14N9Kh3YuF2 is not inferior to steel 38KhMYuA, which has a fairly high wear resistance after nitriding.
2.
Studies of the effect of preliminary heat treatment and the conditions and medium of nitriding on the hardness, depth, and condition of the nitride case showed that the best nitride case on steel 40G14N9Kh3YuF2 is obtained after nitriding at 560 and 600° in ammonia diluted with nitrogen when the steel has a fine-grained structure (after forging or after quenching from 1100° and aging), with an austenite grain size not lower than grade 6.
3.
Surface hardening of steel 40G14N9F2 by roller burnishing and by shot peening increases the fatigue strength of smooth samples by 25–30% and notched samples by 90–140%. The increase in the fatigue strength is due to the high surface hardness (H 550) and compressive stresses (σcom~50–70 kg/mm2) in the surface layer.