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Showing papers on "Roller burnishing published in 1999"


Journal ArticleDOI
TL;DR: In this paper, it was found that residual stresses at expanded holes in several types of aluminium plates produced by split-sleeve and roller burnishing have been evaluated by the destructive Sachs method and then compared.
Abstract: Cold expansion of fastener holes is a common way of improving fatigue performance of airframes. Among the several techniques applicable, the split-sleeve method is the most accepted in creating beneficial compressive residual stresses around expanded holes. In the present work, residual stresses at expanded holes in several types of aluminium plates produced by two different techniques, split-sleeve and roller burnishing, have been evaluated by the novel destructive Sachs method and then compared. It was found that stress distribution particularly at the vicinity of the hole was sensitive to the method of expansion and plate thickness, due to differing characteristics of the plastic material flow. Thus, secondary reverse yielding after cold expansion found to reduce residual hoop stresses at the edge of the hole, and excessive expansion above a limit, was thought to increase reverse yielding. S–N data revealed that no benefit was gained from expanding beyond this limit. It was suggested that the reduction in the number of cycles to crack initiation or more often to crack growth was due to increased reverse yielding at the vicinity of the expanded hole.

49 citations


Patent
06 May 1999
TL;DR: In this article, a tool combining a cutting blade and a burnishing roller was proposed to perform dimensional correction and roller burnishing surface finishing simultaneously in one process suitable for inside processing of a small diameter hole in particular.
Abstract: PROBLEM TO BE SOLVED: To provide a tool combining a cutting blade and burnishing roller to perform dimensional correction and roller burnishing surface finishing simultaneously in one process suitable for inside processing of a small diameter hole in particular. SOLUTION: The parallel arrangement of a cutter 14 and a roller 15 on the outer circumference of the main body enables the simultaneous processing. Also, the symmetrical arrangement of two of the cutters 14 and rollers 15 respectively offsets the cutting resistance and secures coaxial performance. The roller 15 is supported on a mandrel 17 possible to rotate freely. During processing, high-pressure working fluid is supplied to the roller from the working fluid supply routes 12a, 17b to smooth the rotation of the roller and to raise the roller burnishing pressure. Also, high-pressure working fluid is supplied to a chip pocket 16 from the behind to remove chips quickly.

12 citations


Patent
30 Sep 1999
TL;DR: In this paper, a method for manufacturing a mirror surface tube for a photoensitive drum of a copying machine or the like, by which an external surface of an aluminium or aluminium alloy tube can be mirror-processed in a high accuracy without surface defects, and in such a way that good quality required for a photosensitive drum is ensured and dimension accuracy such as roundness and yield in production is improved.
Abstract: An object of the present invention is to provide a method for manufacturing a mirror surface tube for a photosensitive drum of a copying machine or the like, by which an external surface of an aluminium or aluminium alloy tube can be mirror-processed in a high accuracy without surface defects, and in such a way that good quality required for a photosensitive drum is ensured and dimension accuracy such as roundness and yield in production is improved. In a first step, an aluminium or aluminium alloy tube finished in a predetermined shape and dimension with surface roughness of 10 microns or less is processed by centerless grinding process. In a second step, grinding process is performed using an electrolytic integrated polishing apparatus including a tool electrode mechanism having an elastic grindstone so as to make a mirror surface tube having t:he surface roughness of 2.0 microns or less. Further, preferably, in a third stage, roller burnishing process is performed to finish the surface roughness of 0.5 microns or less.

4 citations


01 Jan 1999
TL;DR: In this article, it was found that residual stresses at expanded holes in several types of aluminium plates produced by split-sleeve and roller burnishing have been evaluated by the destructive Sachs method and then compared.
Abstract: Cold expansion of fastener holes is a common way of improving fatigue performance of airframes. Among the several techniques applicable, the split-sleeve method is the most accepted in creating beneficial compressive residual stresses around expanded holes. In the present work, residual stresses at expanded holes in several types of aluminium plates produced by two different techniques, split-sleeve and roller burnishing, have been evaluated by the novel destructive Sachs method and then compared. It was found that stress distribution particularly at the vicinity of the hole was sensitive to the method of expansion and plate thickness, due to differing characteristics of the plastic material flow. Thus, secondary reverse yielding after cold expansion found to reduce residual hoop stresses at the edge of the hole, and excessive expansion above a limit, was thought to increase reverse yielding. S‐N data revealed that no benefit was gained from expanding beyond this limit. It was suggested that the reduction in the number of cycles to crack initiation or more often to crack growth was due to increased reverse yielding at the vicinity of the expanded hole. C

1 citations


01 Jul 1999
TL;DR: In this paper, the possibilities for using roller-burnishing to improve fatigue behavior in the beta titanium alloys Ti-3Al-8V-6Cr-4Mo-4Zr (Beta C) and Ti-10V-2Fe-3 Al (10-2-3) are examined.
Abstract: The possibilities for using roller-burnishing to improve fatigue behavior in the beta titanium alloys Ti-3Al-8V-6Cr-4Mo-4Zr (Beta C) and Ti-10V-2Fe-3Al (10-2-3) are examined. While roller burnishing does not significantly increase the endurance limit in Beta C, fatigue lifetimes at high cyclic stresses can be increased by up to one order of magnitude. In 10-2-3, the endurance limit can be increased by roughly 100 MPa, while fatigue life at high cyclic stresses is only marginally improved.

1 citations