scholarly journals On the Effects of Burnishing Process on Tribological Surface Resistance of Additively Manufactured Steel

2021 ◽  
Author(s):  
Maria Rosaria Saffioti ◽  
Michela Sanguedolce ◽  
Giovanna Rotella ◽  
Luigino Filice
Keyword(s):  
Tribological Behavior ◽  
Surface Characteristics ◽  
Steel Making ◽  
Experimental Campaign ◽  
Plastic Deformation Process ◽  
Finishing Process ◽  
Burnishing Process ◽  
Experimental Findings ◽  
Surface Improvement ◽  
Suitable Process

Burnishing is a Severe Plastic Deformation process having the potential to replace expensive finishing post processes. It is considered a super finishing process due to its results in terms of drastic roughness reduction. Also, additional advantages include the surface integrity improvement functionalized to the specific application. Even though burnishing is widely applied for surface improvement of conventional materials, knowledge about its effect on additively manufactured metals is still limited. This paper aims to fill this gap presenting experiments on roller burnishing on additively manufactured stainless steel in order to improve its tribological performance. The experimental campaign was carried out to find suitable process parameters able to drastically improve the tribological behavior of the final product. In particular, the influence of the burnishing forces on the whole surface quality has been addressed. The overall results demonstrate that the selected burnishing configuration is able to successfully modify the surface characteristics of the steel, making it appropriate for critical applications. Furthermore, the experimental findings allow to conclude that burnishing process can replace a series of post processes needed after additive manufacturing, drastically reducing the time and costs associated to the manufacturing process and meeting Industry 4.0 requirements.

Modeling of surface roughness in a novel magnetorheological gear profile finishing process

2020 ◽  
pp. 095440622097826
Author(s):  
Ravi Datt Yadav ◽  
Anant Kumar Singh ◽  
Kunal Arora
Keyword(s):  
Surface Roughness ◽  
Gear Tooth ◽  
Surface Characteristics ◽  
Spur Gear ◽  
Tooth Profile ◽  
Tooth Surface ◽  
Magnetic Flux Density ◽  
Element Analysis ◽  
Finishing Process ◽  
Gear Profile

Fine finishing of spur gears reduces the vibrations and noise and upsurges the service life of two mating gears. A new magnetorheological gear profile finishing (MRGPF) process is utilized for the fine finishing of spur gear teeth profile surfaces. In the present study, the development of a theoretical mathematical model for the prediction of change in surface roughness during the MRGPF process is done. The present MRGPF is a controllable process with the magnitude of the magnetic field, therefore, the effect of magnetic flux density (MFD) on the gear tooth profile has been analyzed using an analytical approach. Theoretically calculated MFD is validated experimentally and with the finite element analysis. To understand the finishing process mechanism, the different forces acting on the gear surface has been investigated. For the validation of the present roughness model, three sets of finishing cycle experimentations have been performed on the spur gear profile by the MRGPF process. The surface roughness of the spur gear tooth surface after experimentation was measured using Mitutoyo SJ-400 surftest and is equated with the values of theoretically calculated surface roughness. The results show the close agreement which ranges from −7.69% to 2.85% for the same number of finishing cycles. To study the surface characteristics of the finished spur gear tooth profile surface, scanning electron microscopy is used. The present developed theoretical model for surface roughness during the MRGPF process predicts the finishing performance with cycle time, improvement in the surface quality, and functional application of the gears.

scholarly journals High-precision finishing hard steel surfaces using hydrostatic burnishing tool

2018 ◽  
Vol 249 ◽  
pp. 03002 ◽  
Author(s):  
S Swirad
Keyword(s):  
Ball Burnishing ◽  
Anisotropic Surface ◽  
Compressive Stresses ◽  
Finishing Process ◽  
Burnishing Process ◽  
Machine Parts ◽  
Steel Surfaces ◽  
Positive Effect ◽  
Precision Finishing ◽  
High Depth

The objective of this research aims to improve surface roughness of the hardened 145Cr6 (DIN) steel using the hydrostatic burnishing tool. The ball burnishing process with hydrostatic tools is very economical finishing process for various types of machine parts. This process reduces the height of surface unevenness, introduces compressive stresses at high depth (approx. 1 mm) and increase the hardness of the surface layer. The flat surface optimal ball burnishing parameters have been determined after conducting the Taguchi L9 matrix experiment. The input parameters are speed, burnishing force and burnishing width. It also showed a positive effect of hydrostatics burnishing on roughness and geometric structure of the surface. In most cases, the result is anisotropic surface, reduced roughness, reduced amplitude values of parameters such as: Sa, Sz.

scholarly journals Investigation of a plain ball burnishing process on differently machined Aluminium EN AW 2007 surfaces

2018 ◽  
Vol 190 ◽  
pp. 11005 ◽  
Author(s):  
Marco Posdzich ◽  
Rico Stöckmann ◽  
Florian Morczinek ◽  
Matthias Putz
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Process Development ◽  
Fem Simulation ◽  
Initial Surface ◽  
Shape Deviation ◽  
Finishing Process ◽  
Path Distance ◽  
Burnishing Process

Burnishing is an effective chipless finishing process for improving workpiece properties: hardness, vibration resistance and surface quality. The application of this technology is limited to rotationally symmetrical structures of deformable metals. Because of the multiaxial characteristics, the transfer of this force controlled technology on to prismatic shapes requires a comprehensive process development. The main purpose of this paper is the characterization of a plain burnishing process on aluminium EN AW 2007 with a linear moved, spherical diamond tool. The method of design of experiments was used to investigate the influence of different machined surfaces in conjunction with process parameters: burnishing force, burnishing direction, path distance and burnishing speed. FEM simulation was utilized for strain and stress analysis. The experiments show, that unlike the process parameters the initial surface roughness as 3rd order shape deviation does not have a significant influence on the finished surface. Furthermore a completely new surface is created by the process, with properties independent from the initial surface roughness.

Burnishing and Electrofinishing in Screw Surface Polishing

2012 ◽  
Vol 430-432 ◽  
pp. 857-860
Author(s):  
P.S. Pa
Keyword(s):  
Direct Current ◽  
Low Cost ◽  
Surface Polishing ◽  
Finishing Process ◽  
Die Materials ◽  
Screw Surface ◽  
Burnishing Process ◽  
Partial Form ◽  
Pulsed Direct Current ◽  
Electrochemical Finishing

The current study discusses the surface finish of several common die materials, of which the screw-surface is finished by compound processes of electrochemical finishing and burnishing. The burnishing-tool uses ceramic material connected with the electrode and moves, following the electrode, to burnish the workpiece. In the experiment, the electrode is used with a continuous and pulsed direct current. The results show that the use of a higher rotational speed for the electrode and burnishing-tool is advantageous to the finish. A partial form with a thinner heavy section performs the best finish effect in the current investigation. Pulsed direct current can slightly improve the finish effect. The burnishing process can increase the finish effect. An effective and low-cost finish processes through burnishing assistance following electrochemical finishing after screw machining offers a fast improvement for the surface roughness of the screw-surface and is a new application in the screw finishing process.

Tribological behavior of aluminum alloys in a vibratory finishing process

Wear ◽  
2003 ◽  
Vol 255 (7-12) ◽  
pp. 1369-1379 ◽  
Author(s):  
Mohammad Reza Baghbanan ◽  
Akihiro Yabuki ◽  
Roland S. Timsit ◽  
Jan K. Spelt
Keyword(s):  
Aluminum Alloys ◽  
Tribological Behavior ◽  
Vibratory Finishing ◽  
Finishing Process

The Roughness of the Hardened Steel Surface Created by the Rolling-Burnishing Process

2015 ◽  
Vol 220-221 ◽  
pp. 881-886 ◽  
Author(s):  
Bogdan Ścibiorski ◽  
Stefan Dzionk
Keyword(s):  
Geometric Structure ◽  
Steel Surface ◽  
Surface Deformation ◽  
Hardened Steel ◽  
Hard Materials ◽  
Finishing Process ◽  
Burnishing Process

Burnishing hard materials can be used as an alternative finishing process. This paper presents the results of burnishing hardened steel. The article discusses surface deformation that occurs during this process and depends on the selected parameters of the geometric structure of the force applied for surface burnishing.

Influence of lead dioxide electrodes morphology on kinetics and current efficiency of oxygen-ozone evolution reactions

2010 ◽  
Vol 64 (6) ◽  
Author(s):  
Élen Rufino ◽  
Mario Santana ◽  
Luiz Faria ◽  
Leonardo Silva
Keyword(s):  
Current Efficiency ◽  
Lead Dioxide ◽  
Water Discharge ◽  
Water Electrolysis ◽  
Surface Characteristics ◽  
Ozone Production ◽  
Sem Images ◽  
Pbo2 Electrode ◽  
Tafel Slopes ◽  
Experimental Findings

AbstractInfluence of electrode morphology on electrochemical properties of lead dioxide electrodes (β-PbO2) for oxygen-ozone evolution reactions in acid medium was investigated using scanning electronic microscopy (SEM), cyclic voltammetry (CV), polarization curves (PC), and determination of the current efficiency (Φ). Experimental findings revealed that application of high electrodeposition current densities furnishes more rough β-PbO2 films. Surface characteristics were verified by SEM images and the analysis of interfacial pseudo-capacitances and morphology factor (φ). Kinetic study of the overall electrode process (O2 + O3) based on the analysis of the Tafel slope revealed that the electrode morphology and electrolyte composition considerably affect the electrode kinetics. In most cases, the existence of two Tafel slopes distributed in the low and high overpotential domains was observed. Abnormal Tafel slopes (b ≠ 120 mV) obtained for the primary water discharge step during water electrolysis were interpreted considering the apparent charge transfer coefficient (α apa). Optimum conditions for the ozone production were obtained for the less rough β-PbO2 electrode immersed in a sulfuric acid solution (1.0 mol dm−3) containing KPF6 (30 × 10−3 mol dm−3), where the current efficiency of 15 mass % for the ozone production was obtained.

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