Roller burnishing

About: Roller burnishing is a research topic. Over the lifetime, 395 publications have been published within this topic receiving 3322 citations.

Effects of roller burnishing process parameters on surface roughness of A356/5%SiC composite using response surface methodology

Abstract: In this study, a simple roller burnishing tool was made to operate burnishing processes on A356/5%SiC metal matrix composite fabricated by electromagnetic stir casting under different parameters. The effects of burnishing speed, burnishing force and number of burnishing passes on the surface roughness and tribological properties were measured. Scanning electron microscopy (SEM) graphs of the machined surface with PCD (insert-10) tool and roller burnished surface with tungsten carbide (WC) roller were taken into consideration to observe the surface finish of metal matrix composites. The mechanical properties (tensile strength, hardness, ductility) of A356/5%SiC metal matrix composites were studied for both unburnished samples and burnished samples. The results revealed that the roller burnished samples of A356/5%SiC led to the improvement in tensile strength, hardness and ductility. In order to find out the effects of roller burnishing process parameters on the surface roughness of A356/5%SiC metal matrix composite, response surface methodology (RSM) (Box–Behnken design) was used and a prediction model was developed relevant to average surface roughness using experimental data. In the range of process parameters, the result shows that roller burnishing speed increases, and surface roughness decreases, but on the other hand roller burnishing force and number of passes increase, and surface roughness increases. Optimum values of burnishing speed (1.5 m/s), burnishing force (50 N) and number of passes (2) during roller burnishing of A356/5%SiC metal matrix composite to minimize the surface roughness (predicted 1.232 µm) have been found out. There was only 5.03% error in the experimental and modeled results of surface roughness.

Isotropic finishing of austempered iron casting cylindrical parts by roller burnishing.

Abstract: Roller burnishing technique to achieve isotropic surface topography on cylindrical components made of austempered ductile iron (ADI) casting is presented in this paper. In the last years, ADI casting components are used in many mechanical applications, due to their enhanced mechanical properties. ADI castings are difficult-to-cut materials; therefore, advanced techniques to improve manufacturing productivity are necessary and under research. On the other hand, spiral roughness pattern produced by turning operation is a common source of unconformities in several applications. Turning produces a defined kinematic pattern, similar to a thread. This work presents a theoretical and experimental validation using different burnishing conditions. Roughness and surface topography and surface integrity were checked. Results show that the technique greatly improves surface roughness, and eliminates the kinematic-driven roughness pattern of turning, leading to a more isotropic finishing. A comparison between roller burnishing and ball burnishing is also presented in this paper.

Microfinishing and roller burnishing machine

Abstract: A surface finishing tool for use in combination with a power driver for rotating a workpiece about a central axis including a microfinishing assembly adapted to be positioned adjacent the workpiece and having at least one finishing means for surface finishing the workpiece, the finishing means lying in a plane generally perpendicular to the central axis of rotation of the workpiece and a burnishing assembly for applying a burnishing pressure to the workpiece, the burnishing assembly positioned adjacent the workpiece and spaced apart from the microfinishing assembly, the burnishing assembly having at least one burnishing roller lying in the plane generally perpendicular to the central axis of rotation of the workpiece wherein the microfinishing assembly and burnishing assembly are operable upon rotation of the workpiece to microfinish and burnish the workpiece respectively.

Method for manufacturing a bearing raceway member

Abstract: At least a race ( 1 c ) of a blank (B) for forming a bearing raceway member is hardened by heating. The race ( 1 c ) thus hardened by heating is finished to predetermined precisions. Subsequently, the race ( 1 c ) is roller burnished for hardening the race ( 1 c ). The blank (B) is formed from a steel for bearing manufacture or a carbon steel for machine structural use. The blank (B) formed from the steel for bearing manufacture is subjected to the roller burnishing, thereby achieving a hardness of HRC65 or more at a surface of the race ( 1 c ), and a center-line average roughness Ra of 0.1 μm or less at the surface of the race ( 1 c ). The blank (B) formed from the carbon steel for machine structural use is hardened by the roller burnishing, thereby achieving a hardness of Hv800 or more at depth of at least 0.2 mm from a surface of the race ( 1 c ). Where cutting by turning is adopted as the finishing process, the surface of the race ( 1 c ) is finished to a center-line average roughness Ra of 0.35 μm or more and then the race ( 1 c ) is subjected to the roller burnishing, thereby achieving a center-line average roughness Ra of 0.25 μm or less and a compressive residual stress of 1000 MPa or more at depth of at least 0.2 mm from the surface thereof. Where cutting by turning or grinding is adopted as the finishing process, the race ( 1 c ) is subjected to the roller burnishing, thereby achieving a center-line average roughness Ra of 0.15 μm or less at the surface thereof and a compressive residual stress of 1000 MPa or more at depth of at least 0.2 mm form the surface thereof.

Method of machining sleeve bearing

Abstract: A short cylindrical and thin sleeve bearing including a radial bearing portion of a dynamic pressure type on which grooves are formed is worked with high accuracy. Grooves are formed on an inner peripheral surface of a blank by a groove forming tool. Raised deformations generated on the inner peripheral surface as a result of this groove forming are removed by ball sizing of passing a steel ball on the inner peripheral surface. Further, by a roller burnishing tool, the cylindrical bore of the bearing is finished to have a predetermined diameter, and simultaneously, specular finish of the inner peripheral surface is effected.