The Role of HBN Solid Lubricant Reducing Cutting Forces of Dry Machined Al-B4C Composite

2019 ◽  
pp. 697-705 ◽  
Author(s):  
M. Rajesh ◽  
K. Rajkumar ◽  
A. Gnanavelbabu ◽  
K. M. Nambiraj
Keyword(s):  
Cutting Forces ◽  
Solid Lubricant

scholarly journals Role of solid lubricant (MoS2 and graphite) variations on characteristics of brake lining composite

2018 ◽  
Vol 420 ◽  
pp. 012022 ◽  
Author(s):  
G Asmoro ◽  
E Surojo ◽  
Dody Ariawan ◽  
N Muhayat ◽  
W W Raharjo
Keyword(s):  
Solid Lubricant ◽  
Brake Lining

Role of micro and nano-particles of hBN as a secondary solid lubricant for improving tribo-potential of PAEK composite

2019 ◽  
Vol 130 ◽  
pp. 400-412 ◽  
Author(s):  
Jitendra Narayan Panda ◽  
Jayashree Bijwe ◽  
Raj K. Pandey
Keyword(s):  
Solid Lubricant ◽  
Nano Particles

The study of the curvature of the axis of the processed shaft when based in the centers using a steady rest

2021 ◽  
pp. 48-55
Author(s):  
A. V. Brylev ◽  
S. S. Mikheev
Keyword(s):  
Cutting Forces ◽  
Bending Moment ◽  
Elastic Displacement ◽  
Technological Equipment ◽  
Jigs And Fixtures ◽  
Additional Stability ◽  
Secondary Support ◽  
Overall Reliability

This paper presents the analysis and results of the study of a two-stage shaft fixed in dead centers and a rest device. Cutting forces act on the shaft, causing a bending moment. The analysis of the curvature of the axis of the workpiece, processed on a lathe when based in the centers, using a rest device, is carried out. The formula of elastic displacement of the workpiece axis at the place of the resulting cutting force is obtained. Diagrams of the stresses of the shaft axis displacements are constructed and a conclusion is made. The analysis showed that the greatest deflection is at the point of the cutting forces acting on the shaft. The quality of the part obtained after processing is characterized by accuracy. The parts mating in the product and, as a result, the overall reliability depends on how accurately the size and shape of the part will be maintained during processing. Parts with length of 10 to 12 times larger than the diameter are bent under the action of their own weight and cutting forces, as a result of which they get a barrel-like shape. It is possible to eliminate this by applying special devices for the machine. When processing long nonrigid workpieces, the tools, jigs and fixtures must evenly distribute the clamping force over the surface of the part. These conditions are well provided by technological equipment with pneumatic, hydraulic clamping devices, as well as with various collet clamps, split bushings, diaphragm or cartridges. When processing long non-rigid shafts, rest devices are used. The rest device plays the role of the main or secondary support when working with workpieces; it creates support for large, long parts during processing. It helps to avoid the risk of damage and deformation of the workpiece or the cutting elements of the machine, by giving the workpiece additional stability

scholarly journals Understanding the Unique Role of Phospholipids in the Lubrication of Natural Joints: An Interfacial Tension Study

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 264 ◽  
Author(s):  
Aneta D. Petelska ◽  
Katarzyna Kazimierska-Drobny ◽  
Katarzyna Janicka ◽  
Tomasz Majewski ◽  
Wiesław Urbaniak
Keyword(s):  
Interfacial Tension ◽  
Lipid Bilayers ◽  
Solid Lubricant ◽  
Solid Lubricants ◽  
Phospholipid Bilayer ◽  
Low Friction ◽  
Unique Role ◽  
Lamellar Phases ◽  
Chemical Inertness

Some solid lubricants are characterized by a layered structure with weak (van der Waals) inter-interlayer forces which allow for easy, low-strength shearing. Solid lubricants in natural lubrication are characterized by phospholipid bilayers in the articular joints and phospholipid lamellar phases in synovial fluid. The influence of the acid–base properties of the phospholipid bilayer on the wettability and properties of the surface have been explained by studying the interfacial tension of spherical lipid bilayers based on a model membrane. In this paper, we show that the phospholipid multi-bilayer can act as an effective solid lubricant in every aspect, ranging from a ‘corrosion inhibitor’ in the stomach to a load-bearing lubricant in bovine joints. We present evidence of the outstanding performance of phospholipids and argue that this is due to their chemical inertness and hydrophilic–hydrophobic structure, which makes them amphoteric and provides them with the ability to form lamellar structures that can facilitate functional sliding. Moreover, the friction coefficient can significantly change for a given phospholipid bilayer so it leads to a lamellar-repulsive mechanism under highly charged conditions. After this, it is quickly transformed to result in stable low-friction conditions.

Performance Profiling of Nanoparticulate Graphite Powder as Lubricant in the Machining of AISI 1040 Steel under Variable Machining Conditions

2014 ◽  
Vol 984-985 ◽  
pp. 15-24 ◽  
Author(s):  
S. Srikiran ◽  
K. Ramji ◽  
B. Satyanarayana
Keyword(s):  
Particle Size ◽  
Surface Finish ◽  
Cutting Forces ◽  
Solid Lubricant ◽  
Graphite Powder ◽  
Nano Particles ◽  
Chemical Degradation ◽  
Work Piece ◽  
Tool Temperature ◽  
Cutting Zone

The generation of heat during machining at the cutting zone adversely affects the surface finish and tool life. The heat at the cutting zone, which plays a negative role due to poor thermal conductivity, resistance to wear, high strength at high temperatures and chemical degradation can be overcome by the use of proper lubrication. Advancements in the field of tribology have led to the use of solid lubricants replacing the conventional flood coolants. This work involves the use of nanoparticulate graphite powder as a lubricant in turning operations whose performance is judged in terms of cutting forces, tool temperature and surface finish of the work piece. The experimentation revealed the increase in cutting forces and the tool temperature when the solid lubricant used is decreased in particle size. The surface finish deteriorated with the decrease in particle size of the lubricant in the nanoregime.Keywords-Turning, Solid lubricant, Graphite, Minimum Quantity Lubrication, nano–particles,Weight percentage,Frictioncoefficient.

Machining Response and Damage Evolution of Amorphous Carbon Coated Tools in High-Speed Micromilling of Ti–6Al–4V

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Rinku K. Mittal ◽  
Salil S. Kulkarni ◽  
Harish Barshilia ◽  
Ramesh Singh
Keyword(s):  
Amorphous Carbon ◽  
Cutting Forces ◽  
Damage Evolution ◽  
Damage Assessment ◽  
High Speed ◽  
Solid Lubricant ◽  
Coated Tools ◽  
Tool Coating ◽  
Carbon Coated ◽  
Cutting Zone

Abstract Micromilling process is widely used to create complex 3D miniature products due to its flexibility and its ability to process difficult-to-cut material like Titanium alloys. High rotational speeds are used to overcome the limited flexural stiffness of the tool but the cutting zone temperatures rise due to the high rotational speeds. In addition to this, friction between the tool workpiece and tool chip also plays a major role in the temperature rise. The friction and temperature affect the cutting forces, tool life and stability of the process. To reduce the friction and heat generation, nanostructured solid lubricant coatings can be used. This study is focused on characterizing the effect of amorphous carbon (WC/a-C) coating on the micromachining response during high-speed micromilling of Ti–6Al–4V. A decrease in cutting forces for coated tools is observed for lower feed. A comprehensive tool coating damage assessment has been done in terms of debonding area on flank and rake faces. An increase in debonding area has been observed with lengths of cut but at a feed/flute of 4 μm, tool breakage occurs after a machining length of 60 mm.

A study of the role of solid lubricant and fibrous reinforcement in modifying the wear performance of polyethersulphone

2000 ◽  
Vol 17 (2) ◽  
pp. 99-107 ◽  
Author(s):  
J. Bijwe ◽  
J. John Rajesh ◽  
A. Jeyakumar ◽  
A. K. Ghosh
Keyword(s):  
Solid Lubricant ◽  
Wear Performance

Experimental Investigations to Study the Effect of Solid Lubricant MOS2 on the Performance of Hard Turning

2010 ◽  
Author(s):  
Dilbag Singh ◽  
P. Venkateswara Rao
Keyword(s):  
Surface Finish ◽  
Cutting Forces ◽  
Hard Turning ◽  
Solid Lubricant ◽  
Research Work ◽  
Cryogenic Cooling ◽  
Experimental Investigations ◽  
Cutting Fluids ◽  
Machining Performance ◽  
Molybdenum Disulphide

In hard turning, lot of heat is generated due to plastic deformation of the work material, friction at the tool-chip interface and friction between tool and the workpiece. The heat produced in machining adversely affects the quality of the products produced. Cutting fluids have been the conventional choice to deal with this problem. However, due to the environmental restrictions, the use of cutting fluids is restricted. Machining with solid lubricants, cryogenic cooling by liquid nitrogen and minimum quantity lubrication are some of the alternative approaches in this direction. This research work deals with an investigation on using molybdenum disulphide as solid lubricant in order to reduce friction for improving the machining performance and for overcoming some of the limitations that arise due to the use of cutting fluids or while dry hard turning. An experimental setup has been designed and built, and experiments have been conducted to study the effect of using molybdenum disulphide as solid lubricant on surface finish and cutting forces. An improvement in surface finish was observed with molybdenum disulphide assisted hard turning. It was also observed that there was a considerable reduction of cutting forces, thereby reducing the specific energy needed and consequently improving the machining performance.

The effects of cryogenic cooling on chips and cutting forces in turning AISI 1040 and AISI 4320 steels

2002 ◽  
Vol 216 (5) ◽  
pp. 713-724 ◽  
Author(s):  
N R Dhar ◽  
Nanda S V Kishore ◽  
S Paul ◽  
A B Chattopadhyay
Keyword(s):  
Chip Formation ◽  
Cutting Forces ◽  
Substantial Reduction ◽  
Cutting Temperature ◽  
Environmentally Friendly ◽  
Cryogenic Cooling ◽  
Experimental Investigations ◽  
High Production ◽  
On Chip

Application of conventional cutting fluids often cannot control the high cutting temperatures, especially in high production machining. In addition, they are a major source of pollution in machining industries. Cryogenic cooling is a potential environmentally friendly clean technology for desirable control of the cutting temperature. The present work deals with experimental investigations on the role of cryogenic cooling by liquid nitrogen jets on chip formation and cutting forces in turning AISI 1040 steel and AISI 4320 steel at industrial speed—feed combinations by two types of carbide inserts of different geometrical configurations. The experimental results indicate the possibility of a substantial reduction in cutting forces by cryogenic cooling, which enabled a reduction in cutting forces by favourable chip formation, chip—tool interaction and also retention of tool sharpness due to reduced cutting temperature. Thus cryogenic cooling, if properly employed, is not only environmentally friendly but can also improve machinability characteristics.

The Role of Flank Face Interference in Improving the Accuracy of Dynamic Force Predictions in Peripheral Milling

1999 ◽  
Vol 121 (4) ◽  
pp. 593-599 ◽  
Author(s):  
S. Ranganath ◽  
K. Narayanan ◽  
J. W. Sutherland
Keyword(s):  
Cutting Forces ◽  
Milling Process ◽  
Total Force ◽  
Dynamic Force ◽  
Peripheral Milling ◽  
Flank Face ◽  
Simulation Results ◽  
Chip Removal ◽  
Interference Mechanism

An enhanced model for the dynamic behavior of the peripheral milling process is described. The model predicts the cutting forces and cutter deflections by including the effects of the flank face interference mechanism in addition to the chip removal effects. The interference mechanism is accounted for by considering the flank interference forces to be proportional to the interference volume. The volume of interference is estimated numerically. The total force acting on the tool is a combination of the forces due to the cutting action and forces due to the interference. Experiments performed on 6061-T6 Aluminum validate the simulation results.

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