Showing papers on "Roller burnishing published in 1997"
TL;DR: In this article, simple ball-and roller-burnishing tools were used for the experimental work of the present study, these tools being quite similar in their design principles, and the performance of the tools, together with the effects of the burnishing force and the number of burnishing tool passes on the surface roughness and surface hardness of commercially available aluminum and brass, were studied.
158 citations
Journal Article•
TL;DR: In this paper, the authors reduced the roller burnishing process to the classical problem of rolling of a rigid cylinder on a deformable half-space, and focused on the case of high loads when a plastic wave appears ahead of the roller.
Abstract: The roller burnishing process is reduced to the classical problem of rolling of a rigid cylinder on a deformable half-space. Considerations are focussed on the case of high loads when a plastic wave appears ahead of the roller. The half-space is assumed to be rigid-perfectly plastic during loading and elastic during unloading. It enables one to estimate residual stresses in the rolled material. The estimations take a form of simple analytical expressions. The results are compared with the predictions made by Merwin and Johnson (1963), Pomeroy and Johnson (1969).
1 citations
Patent•
17 Jun 1997
TL;DR: In this article, the axial position of a time roller relative to a mandrel is selected, where time roller 2 is held, depending on the inner diameter of the hollow portion, and a shaft 5 is connected to the end of the mandrel 1, part of the roller 2 being somewhat exposed to the outside is inserted in the hollow part and the end is mounted on a motor.
Abstract: PROBLEM TO BE SOLVED: To perform uniform and smooth surface finish over the total length of a hollow portion by axially tensing a mandrel with a plural of rollers arranged on the outer periphery in a rotatable manner and mounting the mandrel with a shaft connected to a motor for relative rotation with a workpiece. SOLUTION: In burnishing the inner wall 11 of the hollow portion of a workpiece 10, the axial position of a roller 2 relative to a mandrel 1 is selected, where time roller 2 is held, depending on the inner diameter of the hollow portion. A shaft 5 is connected to the end of the mandrel 1, part of the roller 2 being somewhat exposed to the outside is inserted in the hollow portion and the end is mounted on a motor. The workpiece 10 is fixed to a position, the motor is rotated and the shaft 5 is tensed. The mandrel 1 is rotated and the outer periphery of the mandrel 1 is planetarily moved. In this way, the rough surface of the inner wall 11 is deformed by rolling and plastic flow so as to be crushed for uniform and smooth surface finish.
1 citations
Patent•
03 Jun 1997
TL;DR: In this paper, a sliding part of a cylinder rod is used for sliding a packing for sealing outflow of operating fluid in a valve main body 15 from leaking to a cylinder 2 side.
Abstract: PROBLEM TO BE SOLVED: To provide a high-pressure air cylinder valve excellent in durability by high precisely finishing a sliding part of a cylinder rod for sliding a packing for sealing outflow of operating fluid in a valve main body to a cylinder side. SOLUTION: A packing 21 is used for preventing fluid in a valve main body 15 from leaking to a cylinder 2 side. Since the resistance between a cylinder rod 12 and the packing 21 is increased with passage of time, it is necessary to consider abrasion of the packing 21 caused by chipping. High precision finishing is performed to the sliding part of the cylinder rod 12 by roller burnishing. In the roller burnishing, a small projecting part on the front surface of the sliding part of the cylinder rod 12 is crushed and embedded in a recessed part, the hardness is increased at the same time that the front surface is made flat, compressive force is made remain, and fatigue strength and abrasion resistance are therefore improved. Since a lubrication film having the several molecular layer thickness is formed in boundary lubrication, the direct contact of the cylinder rod 12 with the packing 21 is prevented, and friction and abrasion are decreased.
1 citations