Showing papers on "Roller burnishing published in 2013"

Mechanics of the burnishing process

Abstract: Burnishing is a low-cost surface treatment process. However, scientific studies on this process have so far failed to describe how the process leads to surface hardening and improvement in the geometric quality of the material. Indeed, in spite of its apparent simplicity the process is rather complicated to reproduce by numerical simulation. This paper proposes a finite element modelling of the ball burnishing process. Thanks to this model, the effect of the burnishing process on the material is analysed. A ridge phenomenon that affects the mechanics of the process is demonstrated, allowing for improved modelling of the burnishing process.

An investigation of the mechanics of roller burnishing through finite element simulation and experiments

Abstract: Roller burnishing is a surface treatment process that is of particular economic interest but not really well optimised. Due to a necessarily high degree of mesh refinement, until now the modelling of the process is rather limited to 2D plane strain finite element simulation. In order to account for fully tridimensional induced stress state, a 3D finite element model of the industrial burnishing process is proposed. A specific strategy consisting in determining a representative layer of the part and a minimum number of cycles is necessary to obtain results that can be compared to experimental ones. The quality of the obtained results in a reasonable simulation time demonstrates the possibility to efficiently use full 3D simulation for the burnishing process.

ROLLER BURNISHING-A Literature Review of Developments and Trends in Approach to Industrial Application

Abstract: Burnishing is a cold working, surface treatment; chip less process in which plastic deformation of surface irregularities occurs by exerting pressure through a very hard and smooth roller on a surface to generate a highly smooth and work-hardened surface. Roller burnishing is an economical process, where skilled operators are not required. This paper presents the reviews of different works in the area of burnishing and tries to find out latest developments and trends available in industries in order to minimize the total equipment cost and result in high production rate, with accuracy and without considerably increasing existing inventories.

Effect of roller burnishing on pure aluminum alloyed by copper

Abstract: Purpose – The purpose of this paper is to review, analyze and present the effects of the roller burnishing process on pure aluminum alloyed by pure copper at 3%, 6% and 9% percentages. Roller burnishing is one of the effective finishing treatment methods in terms of stabilization of surface layers properties along the depth, Roller burnishing is one of the effective methods used to improve the surface layer properties such as microhardness and average surface roughness.Design/methodology/approach – Three different Al‐Cu alloys of 3%, 6% and 9% copper additions were prepared and microstructure, micro hardness and mechanical properties investigated. Then the roller burnishing mechanism was applied on Al‐Cu alloys on cylindrical work pieces, different conditions were used, and the results were obtained and discussed.Findings – The best enhancement in hardness was 46.4% which was achieved at 9% Cu addition, whereas the best enhancement in the flow stress was 101.8% which was achieved at 9% Cu addition. Applyi...

Investigation of Variance of Roller Burnishing Parameters on Surface Quality by Taguchi Approach

Abstract: Surface roughness of engineering parts is very significant property that effectively influences on the wear and fatigue strength. There are many methods for improving surface quality of engineering parts such as grinding, lapping and honing. One of the methods for improving surface quality is Roller Burnishing. Roller Burnishing improves surface quality of engineering parts by means of Cold working. Roller Burnishing depends on many factors such as RPM of work piece, feed rate of Burnishing tool and the penetration depth of Roller burnishing tool into the work piece. At the present paper, we have tried to investigate the effective factors of Roller Burnishing and optimize them by means of Taguchi approach.

Ballizing Process Impact on the Geometric Structure of the Steel Tubes

Abstract: The paper presents effect of burnishing broaching process on the geometric structure of the steel tubes. Burnishing is a plastic surface treatment. Processing tools are hard and smooth surface. Burnishing elements of are ball, roll and disk. Burnishing be flat surfaces, and cylindrical shape. Burnished surfaces are cylindrical outer and inner. Because of the type of the force can be divided into static and dynamic burnishing. Due to the kinematics can be divided into sliding and roller burnishing. Occurrence of moving parts in direct contact with the material qualifies for the group process of burnishing rolling. The sliding burnishing design element property is part of the work surface burnished permanently attached to the handle. Burnishing is used as a finishing strengthens and smoothness, can be realized on the universal machine tools and machining centers, effectively replaces the machining operations such as grinding, reaming, honing and lapping.

Device and method for electromechanically-assisted roller burnishing

Abstract: The invention relates to a device and method for electromechanically roller burnishing a surface of a workpiece, in which precisely one current-guiding roller burnishing element for roller burnishing and one separate electrical contact element are used and, as the roller burnishing element is moved on the workpiece surface, said electrical contact element is guided thereafter such that a current path of a constant length is directed through the workpiece as roller burnishing takes place. The invention allows, in a cost-effective manner, a high surface quality to be achieved as well as a precisely-adjustable microstructural alteration to the upper layers of the workpiece.

Turning and/or roller burnishing machine

Abstract: The invention relates to a turning and/or roller burnishing machine (1) having a base part (3), which is designed as to be assembled in a stationary manner, particularly to a component to be processed (2), a drive (4), a rotation part (6) held on the base part (3) and rotatable relative thereto about a central axis (9) using the drive (4), and a tool holder (26, 35) which is arranged spaced apart from the central axis (9) on the rotation part (6) and is designed to receive a turning and/or roller burnishing tool (27, 36).

Method for rolling a cylindrical component surface

Abstract: The method involves pressing a rolling element (3) by hydrostatic pressurization radially and outwardly against the component surface. The rolling element is left to roll down the component surface by rotating the roller burnishing tool or the workpiece (1). The measured value representing the torque which arises as a result of friction between the rolling element and the component surface is detected. The measured torque value representing the torque for evaluation is supplied. An independent claim is included for a roller burnishing tool.

Effect of casting defects and roller burnishing on fatigue properties of a cast aluminum alloy AC4CH

Abstract: In order to clarify the effect of casting defects on the high cycle fatigue properties, rotary bending fatigue tests were carried out on a cast aluminum alloy, JIS AC4CH, with two different levels of defect size. As a result of fatigue tests, the fatigue strength decreased with increasing the defect size. The fatigue limits were estimated by the area parameter model and compared with experimental values. The maximum defect size evaluated by the extreme value statistics was used in the prediction. The predicted values of fatigue limits for specimens with the different defect sizes were not in good agreement with the experimental values. In addition, the effects of the roller burnishing process on surface conditions and fatigue properties were also investigated. Vickers’ hardness and compressive residual stress on the specimen surface were increased by the burnishing process. An improvement of fatigue property was found in the burnished specimen. It is due to the disappearance of casting defect on the specimen surface, and increase of hardness and compressive residual stress.

Method for roller burnishing a cylindrical component part surface

Abstract: A method for roller burnishing a cylindrical component part surface of a workpiece includes using a roller burnishing tool including at least one rolling element. The at least one rolling element is pressed by hydrostatic pressurization radially outwardly against the component part surface and is left to roll down on the component part surface by rotating the roller burnishing tool or the workpiece. The torque arising as a result of the friction between the at least one rolling element and the component part surface is detected and sent for evaluation.

Piston ring for internal combustion engines with increased fatigue strength, and method for producing same

Abstract: A piston ring ( 2 ) having increased fatigue resistance includes a plastically deformable material. The piston ring ( 2 ) has a running face ( 4 ), which is delimited at the top by an upper running face edge ( 3 ) and at the bottom by a lower running face edge ( 1 ). Compressive stresses are introduced into the upper running face edge ( 3 ) and/or into the lower running face edge ( 1 ) along at least one part of the circumference, the compressive stresses having been produced by roller burnishing.

Application of roller burnishing process for final machining of cilindrical surface

Abstract: Final machining of 34CrMo4 steel with roller burnishing tools is shown in this paper. Roller burnishing process is clean and environmentally friendly machining process which can replace other finishing processes with pollution effects. Experimental tests on specimens prepared for final machining process estimates the rate of roughness decrease, and diameter increase. Roughness data measured before and after roller burnishing process have been compared. Roughness ratio (before/after process) and decrease factor for surface quality improvement can be up to 10. Presented smoothing process can be performed on standard machine tools without additional reconfiguration tasks. Process is very versatile for any workshop and can be conducted without coolant.

An Investigation for Surface Integrity of Al2O3/A356 Composites Using Roller Burnishing Process on a Milling Machine

Abstract: Roller burnishing process was applied to Al2O3/A356 composite specimens. The process was carried out on vertical milling machine. Effects of the burnishing process with varying process parameters on the characteristics of the machined surface and sub-surfaces were investigated. Residual stress distribution at different depths beneath the burnished surfaces, microhardness distribution, surface roughness were used as criteria to obtain the optimum burnishing conditions that give burnished surfaces with high integrity for the Al2O3/A356 composite. Results showed an improvement in surface characteristics of Al2O3/A356 composites using burnishing process. The better surface roughness was obtained with double passes burnishing, depth of penetration of 0.12 mm, and burnishing speed of 72 mm/min. Increase of number of burnishing passes increases the value of residual compressive stress and the microhardness at the burnished surface and subsurface. The microhardness slightly decreased with the increase of burnishing speed.

Roller burnishing machining method

Abstract: PROBLEM TO BE SOLVED: To provide a roller burnishing machining method capable of being used for general purpose to various kinds and various size of structures, excellent in surface quality and being inexpensive.SOLUTION: The roller burnishing machining method of a structure P is configured so that: an inclination angle α is made on a rotation shaft Oof a machining roller 11 so that a rotation shaft Oof the structure P and the rotation shaft Oof the machining roller 11 cross each other along inside of a contact plane passing a machining point of the rotating structure P, for actuating rolling machining by rolling of the machining roller 11 and sliding machining by sliding of the machining roller 11 in an integrated state on the surface of the structure P.