scholarly journals Mechanism of Ball Burnishing Process for Radius of Curvature for Elastic and Plastic Deformation between Ball and Hole

2012 ◽  
Vol 9 (1) ◽  
pp. 133-138
Author(s):  
Pankaj K. Upadhyay ◽  
Pankaj Agarwal ◽  
A. R. Ansari ◽  
Ravindra Mohan
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Low Cost ◽  
Surface Hardness ◽  
Radius Of Curvature ◽  
Al Alloy ◽  
Ball Burnishing ◽  
Machine Material ◽  
Burnishing Process ◽  
Grade Material

Ball burnishing (ballizing) chip less process which produces a smooth surface and surface hardness. The pressure generated by the ball exceeds a plastic deformation stage and create a new surfaces. The plastic deformation created by ball burnishing is a cold flows under pressure into the valleys surface is smooth, Ballizing is a technique for sizing and finishing holes in metal components. It is a rapid and relatively low cost process. A suitably oversized precision ball is pressed through an unfinished undersized hole, A simple tooling such as a hardened ball and a push rod is required for this process. However an intensive analysis is essential for analysing the mechanics of the process. The ball burnishing is very useful process to improve upon surface roughness and can be employed. It will help to impart compressive stress and fatigue life can be improved. The Al alloy is a difficult to machine material and burnishing is difficult process for this grade material. A low surface roughness and hardness was obtained in increasing the operating parameters. It may develop flaw and micro cracks on the surface.

Optimization of the Surface Roughness and Superficial Hardness Improvement Using the Hybrid Grey-Based Taguchi Method for the Small Ball-Burnishing Process of STAVAX

2015 ◽  
Vol 649 ◽  
pp. 112-119
Author(s):  
Quoc Nguyen Banh ◽  
Fang Jung Shiou
Keyword(s):  
Surface Roughness ◽  
Taguchi Method ◽  
Process Condition ◽  
Surface Hardness ◽  
Principal Component ◽  
Ball Burnishing ◽  
Small Ball ◽  
Burnishing Process ◽  
Step Over ◽  
Number Of Passes

This study aims to optimize the small ball-burnishing process parameters in order to simultaneously improve the surface roughness and superficial surface hardness of the STAVAX material. A newly developed load cell embedded double spring mechanism burnishing tool was designed and fabricated. By utilizing the hybrid grey-based Taguchi method with principal component analysis (PCA) and entropy measurement the optimal process condition was the combination of the burnishing force at 10 N, the step-over at 6 μm, the number of passes at 3 times, the grease for lubricant, and the burnishing speed at 500 mm/min. The burnishing force, step-over, and the number of passes were found to have the main effects on the burnished surfaces among the five chosen control factors. The burnished surface of STAVAX material under the optimal condition was improved from Ra 0.85 to Ra 0.079 for average surface roughness, and from 67.3 HR30N to 72.7 HR30N in term of superficial hardness.

scholarly journals PENGARUH SPUTTERING TiN TERHADAP KEKASARAN, KEKERASAN PERMUKAAN MATERIAL AISI316L

2019 ◽  
Vol 18 (3) ◽  
pp. 331-338
Author(s):  
Jemssy Ronald Rohi ◽  
Priyo Tri Iswanto ◽  
Tjipto Sujitno ◽  
Erich Umbu Kondi
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Corrosion Resistance ◽  
Deposition Time ◽  
Low Cost ◽  
Surface Hardness ◽  
The Body ◽  
Aisi 316L ◽  
Good Corrosion Resistance ◽  
Long Time

AISI 316L is widely used for implantation in orthopedic surgery due to its good corrosion resistance, mechanical properties and low cost. However, AISI 316L is not well suited for biocompatibility with the body, so implant material with AISI 316L can’t be used for a long time. One way to improve the corrosion resistance and mechanical properties of AISI 316L is to perform a surface treatment such as sputtering. This study discusses the effect of deposition sputtering TiN of 60, 90, 120 and 150 minutes on roughness and surface hardness at a ratio of argon gas and nitrogen to 80% Ar:20% N2. The results of the surface roughness value of the TiN sputtering layer deposited to AISI 316L for 60, 90, 120, and 150 minutes were 0.02 μm, 0.04 μm, 0.06 μm, and 0.04 μm respectively. This shows that the coating time of TiN in AISI 316L has no significant influence on value of surface roughness. Surface hardness results at 60, 90, 120, and 150 minutes were obtained with 268 HVN, 275 HVN, 278 HVN and 282 HVN. Increased hardness value, as the TiN thin layer has a higher hardness value compared to AISI 316L. The longer the deposition time, the more layers are formed and the layer becomes thicker. With the thickness of the layer, the density at the grain boundary increases. Because the higher density leads to grain growth, in which form micropores.

scholarly journals Experimental Investigation on the Wear and Damage Characteristics of Machined Wheel/Rail Materials under Dry Rolling-Sliding Condition

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 472
Author(s):  
Peijie Liu ◽  
Yanming Quan ◽  
Junjie Wan ◽  
Lang Yu
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Surface Defects ◽  
Wear Behavior ◽  
Friction Pair ◽  
Surface Hardness ◽  
Wear Testing ◽  
Wear Loss ◽  
Machining Parameters ◽  
Deformation Layer

To guarantee the smooth operation of trains, rail grinding and wheel turning are necessary practices to remove surface defects. Surface integrity of machined wheel/rail materials is significant to affect their tribological performance. In this paper, firstly, the wheel specimens were turned by a CNC lathe and the rail specimens were ground by a cylindrical grinding machine with various machining parameters. Then, the wear and damage behavior of the machined wheel/rail discs was systematically investigated via a twin-disc wear testing apparatus under dry rolling-sliding condition. The experimental results show that the surface hardness of rail discs after machining is slightly higher than that of wheel discs, while the surface roughness and plastic deformation layer of wheel discs are much larger than those of rail discs. The surface hardness increase degree of rail discs and their thickness of plastic deformation layer are greater than those of wheel discs after the rolling-sliding test. The wear loss of wheel discs is much larger than that of rail discs. Surface roughness, hardness and plastic deformation layer of wheel/rail discs after machining exert a comprehensive effect on the wear behavior, and friction pair with appropriate original surface hardness and roughness generates the smallest amount of wear loss.

Enhancement in Microhardness of Free Machining Brass in Ball Burnishing

2020 ◽  
Vol 12 (2) ◽  
Author(s):  
Pavana Kumara ◽  
G.K. Purohit
Keyword(s):  
Plastic Deformation ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Process Parameters ◽  
Surface Texture ◽  
Ball Burnishing ◽  
Abrasive Particles ◽  
Metal Finishing ◽  
Burnishing Process ◽  
Machined Surfaces

The burnishing process is becoming an attractive way among post-machining, metal finishing techniques due to its excellent features. The burnishing process carried out with ball or roller, smooth out the protrusions due to the plastic deformation and increases the surface texture. This paper presents the results of three ball burnishing conditions carried out on cylindrical free machining brass components. Influence of abrasive particles (abrasive assisted burnishing, AAB) during burnishing is investigated and compared with the burnishing carried out without (plain burnishing, PB) and with-coolant (lubricated burnishing, LB) conditions. The response surface methodology (RSM) is used to optimize the microhardness in terms of four process parameters. Result obtained indicates that the microhardness of the pre-machined surfaces increases by 12-29 percent. The AAB results in 141.67 percent higher microhardness than the PB and 41 percent more than the LB condition.

scholarly journals Optimization of compressed air assisted-turning-burnishing process for improving machining quality, energy reduction and cost-effectiveness

2020 ◽  
pp. 095440542097666
Author(s):  
Trung-Thanh Nguyen ◽  
Chi-Hieu Le
Keyword(s):  
Surface Roughness ◽  
Energy Consumption ◽  
Surface Hardness ◽  
Compressed Air ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Machined Surface ◽  
Machining Quality ◽  
Machining Speed ◽  
Burnishing Process

The burnishing process is used to enhance the machining quality via improving the surface finish, surface hardness, wear-resistance, fatigue, and corrosion resistance, and it is mostly used in aerospace, biomedical, and automotive industries to improve reliability and performance of the component. The combined turning and burnishing process is therefore considered as an effective solution to enhance both machining quality and productivity. However, the trade-off analysis between energy consumption, surface characteristics, and production costs has not been well-addressed and investigated. This study presents an optimization of the compressed air assisted-turning-burnishing (CATB) process for aluminum alloy 6061, aimed to decrease the energy consumption as well as surface roughness and to enhance the Vicker hardness of the machined surface. The machining parameters for consideration include the machining speed, feed rate, depth of cut, burnishing force, and the ball diameter. The improved Kriging models were used to construct the relations between machining parameters and the technological response characteristics of the machined surface. The optimal machining parameters were obtained utilizing the desirability approach. The energy based-cost model was developed to assess the effectiveness of the proposed CATB process. The findings showed that the selected optimal outcomes of the depth of cut, burnishing force, diameter, feed rate, and machining speed are 0.66 mm, 196.3 N, 8.0 mm, 0.112 mm/rev, and 110.0 m/min, respectively. The energy consumption and surface roughness are decreased by 20.15% and 65.38%, respectively, while the surface hardness is improved by 30.05%. The production cost is decreased by 17.19% at the optimal solution. Finally, the proposed CATB process shows a great potential to replace the traditional techniques which are used to machine non-ferrous metals.

Dynamic Analysis of Ball Vibration Assisted Burnishing

2010 ◽  
Vol 139-141 ◽  
pp. 925-928
Author(s):  
Feng Lei Li ◽  
Wei Xia ◽  
Zhao Yao Zhou ◽  
Jing Zhao ◽  
Zheng Qiang Tang
Keyword(s):  
Surface Roughness ◽  
Plastic Deformation ◽  
Severe Plastic Deformation ◽  
High Speed ◽  
Friction And Wear ◽  
Contact Method ◽  
Dynamic Force ◽  
Ball Burnishing ◽  
High Speed Impact ◽  
Loading Type

Vibration Assisted Burnishing (VAB) is an advanced burnishing form incorporating dynamic force resulting from vibration into burnishing not only to change the loading type and contact method to greatly reduce friction and wear, but also to produce an excellent nanocrystalline surface by severe plastic deformation induced by high speed impact. The expression describing the relation between decrease of surface roughness and ball burnishing force is given. The dynamic model of ball VAB is established. The relations between VAB depth, VAB force and VAB time and their maximum values are derived, and the required maximum power of the vibration generator is then obtained. The theoretical equivalent burnishing force of ball VAB is only about 47.55% that of conventional burnishing, which prove validity of ball VAB.

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