scholarly journals Effect of sphere configurated particle damper on tribological properties during boring of hardened steel

2021 ◽  
Vol 13 (2) ◽  
pp. 21-33
Author(s):  
Lawrance Gunaraj ◽  
◽  
Sam Paul ◽  
Ebenezer Jacob Dhas ◽  
◽  
...  
Keyword(s):  
Tool Wear ◽  
Tribological Properties ◽  
Surface Finish ◽  
Manufacturing Sector ◽  
Hardened Steel ◽  
Sphere Diameter ◽  
Tool Vibration ◽  
Boring Tool ◽  
Particle Damping

Tool vibration is the most unfavourable element in the boring operation, as it contributes to poor surface finish, excessive tool wear, and progressive cutting force. Tool vibration mainly occurs due to the overhanging length of the boring tool and to overcome this factor an appropriate mechanism has to be established which helps to increase the production and quality of the product in manufacturing sector. An impact particle damper with variable material spheres, sphere diameter, and sphere location in a boring tool is fabricated in this work. A 27 run experiments were conducted to find the effect of impact particle damping on tribological properties during boring process. The results shows that impact particle damper increases the rigidity of the tool holder which enhances the tribological properties. The sphere in the boring tool will collide with one another thereby suppressing the tool vibration efficiently.

Experimental Investigation on Boring Tool Vibration Control Using MR Fluid Damper

2016 ◽  
Vol 15 (01) ◽  
pp. 13-25 ◽  
Author(s):  
E. Mohan ◽  
U. Natarajan
Keyword(s):  
Vibration Control ◽  
Research Work ◽  
Machining Process ◽  
Work Piece ◽  
Mr Fluid ◽  
Tool Vibration ◽  
Fluid Damper ◽  
Boring Tool ◽  
Mr Fluid Damper

In the manufacturing industry, most of the components are made by machining operations. The performance of the product to a large extent is dependent on the accuracy and consistency of the machining processes. Various parameters are considered to achieve the high quality of the machining. Out of which, vibration is one of the important parameters that will lead poor quality of the product and also reduce the tool life. Vibrations are induced by metal cutting operation during machining. Turning operations and especially boring operations are associated with severe vibration-related problems. Boring operation is often done with a boring bar, which is necessarily long and slender so that it can fit into the multipart work piece geometry. Such tools are lack of dynamic stiffness and stability, this manufacturing operation is repeatedly plagued with self-excited vibrations known as chatter. Magnetorheological (MR) fluid is employed in this research work to control the vibration of a boring tool. The MR fluid damper has received great attention due to its ability to reversibly change from a free flowing, linear, viscous liquid to a semi-solid when exposed to magnetic fields in just a few milliseconds and was also found to be effective in suppressing tool vibration. Vibration control during machining process is an important tactic to suppress the chatter vibration. The aim of this approach is to reduce the relative displacements between the tool and the work piece during the machining process.

Preheating in End Milling of AISI D2 Hardened Steel with Coated Carbide Inserts

2009 ◽  
Vol 83-86 ◽  
pp. 56-66 ◽  
Author(s):  
Mohd Amri Lajis ◽  
A.K.M. Nurul Amin ◽  
A.N. Mustafizul Karim ◽  
A.M.K. Hafiz
Keyword(s):  
Tool Wear ◽  
Surface Finish ◽  
End Milling ◽  
Cutting Speed ◽  
Hardened Steel ◽  
Depth Of Cut ◽  
Inductive Heating ◽  
Machining Parameters ◽  
Aisi D2 ◽  
Coated Carbide

This study was conducted to investigate the effect of preheating through inductive heating mechanism in end milling of AISI D2 hardened steel (60-62 HRC) by using coated carbide tool inserts. Apart from preheating, two other machining parameters such as cutting speed and feed were varied while the depth of cut constant was kept constant. Tool wear phenomenon and machined surface finish were found to be significantly affected by preheating temperature and other two variables. End milling operation was performed on a Vertical Machining Centre (VMC). Preheating of the work material to a higher temperature range resulted in a noticeable reduction in tool wear rate leading to a longer tool life. In addition, improved surface finish was obtained with surface roughness values lower than 0.4 μm, leaving a possibility of skipping the grinding and polishing operations for certain applications.

FRACTAL-BASED ANALYSIS OF THE RELATION BETWEEN THE FRACTAL STRUCTURES OF MACHINED SURFACE AND TOOL WEAR IN TURNING OPERATION

Fractals ◽  
2019 ◽  
Vol 27 (06) ◽  
pp. 1950094 ◽  
Author(s):  
CHAI LIP KIEW ◽  
AKSHAYEN BRAHMANANDA ◽  
KH TAUHID ISLAM ◽  
HAO NAM LEE ◽  
SAMUEL ANTHONY VENIER ◽  
...  
Keyword(s):  
Tool Wear ◽  
Surface Quality ◽  
Surface Finish ◽  
Complex Structure ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Machined Surface ◽  
Turning Operation ◽  
Machining Operations

Obtaining the optimum surface finish is one of the key factors in machining operations. For this purpose, engineers apply a set of machining parameters to obtain the desired surface quality. On the other hand, tool faces wear during machining operation that itself affects the surface quality of machined surface. Therefore, tool wear and surface finish of machined workpiece should be related to each other. In this research, we employ fractal analysis in order to investigate the correlation between variations of complex structure of machined surface and tool wear in turning operation. In fact, we changed the machining parameters between different experiments and investigated how the machined surface is correlated with the tool wear. Based on the obtained results, we can see the correlation between the complexity of machined surface and tool wear by increasing the depth of cut, spindle speed and feed rate in different experiments. The method of analysis employed in this research can be widely applied to other machining operations in order to find the correlation between the surface quality of machined surface and tool wear.

scholarly journals The Tribological Properties of Laser Hardened Steel 42CrMo4 / Właściwości Tribologiczne Stali 42Crmo4 Hartowanej Laserowo

2015 ◽  
Vol 60 (4) ◽  
pp. 2939-2944 ◽  
Author(s):  
W. Tarasiuk ◽  
A.I. Gordienko ◽  
A.T. Wolocko ◽  
J. Piwnik ◽  
B. Szczucka-Lasota
Keyword(s):  
Surface Layer ◽  
Tribological Properties ◽  
High Resistance ◽  
Hardened Steel ◽  
Laser Head ◽  
Friction Tester ◽  
Pin On Disc ◽  
Resistance To Wear ◽  
Hardened Surface

The paper presents results of research tribological properties laser hardened steel 42CrMo4. Parameter influencing on the quality of the hardened surface was laser head speed. The study was conducted on friction tester pin-on-disc type T-11, and a counter sample disc was silicate. Parameter determining the quality of the surface layer is the intensity of wear. Based on the results we obtain information about the laser head speed to temper steel 42CrMo4 so as to maintain a high resistance to wear.

Tribological Properties and Tool Wear in Milling of in-situ TiB2/7075 Al Composite under Various Cryogenic MQL Conditions

2021 ◽  
pp. 107021
Author(s):  
Jie Chen ◽  
Weiwei Yu ◽  
Zhenyu Zuo ◽  
Yugang Li ◽  
Dong Chen ◽  
...  
Keyword(s):  
Tool Wear ◽  
Tribological Properties ◽  
Al Composite

scholarly journals Machining Ti-6Al-4V Alloy Using Nano-Cutting Fluids: Investigation and Analysis

2021 ◽  
Vol 5 (2) ◽  
pp. 42
Author(s):  
Abdelkrem Eltaggaz ◽  
Ibrahim Nouzil ◽  
Ibrahim Deiab
Keyword(s):  
Surface Finish ◽  
Minimum Quantity Lubrication ◽  
Weight Fraction ◽  
Contact Length ◽  
Al2o3 Nanoparticles ◽  
Compressive Stresses ◽  
Cutting Zone ◽  
The Impact ◽  
Cooling And Lubrication

Minimum Quantity Lubrication nanofluid (MQL-nanofluid) is a viable sustainable alternative to conventional flood cooling and provides very good cooling and lubrication in the machining of difficult to cut materials such as titanium and Inconel. The cutting action provides very difficult conditions for the coolant to access the cutting zone and the level of difficulty increases with higher cutting speeds. Furthermore, high compressive stresses, strain hardening and high chemical activity results in the formation of a ‘seizure zone’ at the tool-chip interface. In this work, the impact of MQL-nanofluid at the seizure zone and the corresponding effects on tool wear, surface finish, and power consumption during machining of Ti-6Al-4V was investigated. Aluminum Oxide (Al2O3) nanoparticles were selected to use as nano-additives at different weight fraction concentrations (0, 2, and 4 wt.%). It was observed that under pure MQL strategy there was significant material adhesion on the rake face of the tool while the adhesion was reduced in the presence of MQL-nanofluid at the tool-chip interface, thus indicating a reduction in the tool chip contact length (TCCL) and reduced seizure effect. Furthermore, the flank wear varied from 0.162 to 0.561 mm and the average surface roughness (Ra) varied from 0.512 to 2.81 µm. The results indicate that the nanoparticle concentration and the reduction in the seizure zone positively influence the tool life and quality of surface finish.

scholarly journals Hardened Steels and Their Machining

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 182
Author(s):  
Karel Osička ◽  
Josef Chladil
Keyword(s):  
Cubic Boron Nitride ◽  
Tool Material ◽  
Hardened Steel ◽  
Engineering Industry ◽  
Technical Equipment ◽  
Correct Operation ◽  
Assembly Unit ◽  
The Subject ◽  
Bearing Rings

This article discusses the issue of hardened steel machining. Many components in the engineering industry use hardening as the final heat treatment. These components usually occupy a significant position in a given assembly unit. They guarantee the correct operation of the entire technical equipment in total cooperation with other components. The quality of these components depends on the integrity of their surface. The production of these parts is usually carried out by traditional technological procedures. Clearly, an example of such a technology is grinding. However, this article discusses the application of other finishing technologies using a tool material made of cubic boron nitride (CBN). The technology used is finishing turning with subsequent tumbling technology. The subject of the evaluation is the integrity of the surface. In this part of the experiments, there are mainly individual parameters of surface roughness. Compared components are bearing rings, in this case the inner surface of the housing ring.

Determination of Relationship between Chemical Composition of Electrolyte and Surface Sample Quality

2015 ◽  
Vol 669 ◽  
pp. 150-157
Author(s):  
Peter Michal ◽  
Alena Vagaská ◽  
Miroslav Gombár
Keyword(s):  
Sodium Chloride ◽  
Chemical Composition ◽  
Oxalic Acid ◽  
Boric Acid ◽  
Oxide Layer ◽  
Surface Finish ◽  
Chemical Factors ◽  
Substrate Sample

Paper tracks experimentally confirmed relationship between chemical composition of electrolyte and resulting surface finish quality of created oxide layer during the process of anodic oxidation of aluminium. Examined chemical factors were: concentrations of sulphuric acid, oxalic acid, boric acid and sodium chloride. Aggressive effects of electrolyte were chosen as indicator of resulting layer quality – presence and extent of etching of used substrate sample.

Cutting Tool Wear and Mechanisms of Chip Formation During High-Speed Machining of Compacted Graphite Iron

2007 ◽  
Author(s):  
Niniza S. P. Dlamini ◽  
Iakovos Sigalas ◽  
Andreas Koursaris
Keyword(s):  
Tool Wear ◽  
Surface Finish ◽  
Failure Criterion ◽  
Cutting Tool ◽  
Flank Wear ◽  
Cutting Tools ◽  
Compacted Graphite Iron ◽  
Crater Wear ◽  
Compacted Graphite ◽  
Cutting Speeds

Cutting tool wear of polycrystalline cubic boron nitride (PcBN) tools was investigated in oblique turning experiments when machining compacted graphite iron at high cutting speeds, with the intention of elucidating the failure mechanisms of the cutting tools and presenting an analysis of the chip formation process. Dry finish turning experiments were conducted in a CNC lathe at cutting speeds in the range of 500–800m/min, at a feed rate of 0.05mm/rev and depth of cut of 0.2mm. Two different tool end-of-life criteria were used: a maximum flank wear scar size of 0.3mm (flank wear failure criterion) or loss of cutting edge due to rapid crater wear to a point where the cutting tool cannot machine with an acceptable surface finish (surface finish criterion). At high cutting speeds, the cutting tools failed prior to reaching the flank wear failure criterion due to rapid crater wear on the rake face of the cutting tools. Chip analysis, using SEM, revealed shear localized chips, with adiabatic shear bands produced in the primary and secondary shear zones.

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