Cutting tools require materials with high hardness, strength, and wear resistance at elevated temperatures. Common tool materials include high-speed steels, cast cobalt alloys, tungsten carbide, and coated tools. Newer coated tools can last 10 times longer than uncoated tools due to coatings like titanium nitride which provide lower friction and higher resistance to cracks and wear, allowing higher cutting speeds.
Unit 2 Machinability, Cutting Fluids, Tool Life & Wear, Tool MaterialsMechbytes
Concept of machinability, machinability index, factors affecting machinability
Different mechanism of tool wear types of tool wear (crater, flank etc.), Measurement and control of tool wear
Concept of tool life, Taylor's tool life equation (including modified version)
Different tool materials and their applications including effect of tool coating
Introduction to economics of machining
Cutting fluids: types, properties, selection and application methods
this presentation tries to explain the various heat zones that are developed during the metal cutting process. furthermore, how much heat is dissipated from the various zones. lastly the possible methods of temperature reduction in brief.
Unit 2 Machinability, Cutting Fluids, Tool Life & Wear, Tool MaterialsMechbytes
Concept of machinability, machinability index, factors affecting machinability
Different mechanism of tool wear types of tool wear (crater, flank etc.), Measurement and control of tool wear
Concept of tool life, Taylor's tool life equation (including modified version)
Different tool materials and their applications including effect of tool coating
Introduction to economics of machining
Cutting fluids: types, properties, selection and application methods
this presentation tries to explain the various heat zones that are developed during the metal cutting process. furthermore, how much heat is dissipated from the various zones. lastly the possible methods of temperature reduction in brief.
Theory of Metal cutting - Principles of Metal cutting, orthogonal and oblique cutting, Merchant circle diagram, cutting forces, power requirements, Economics of machining,problems
Advanced machining processes
Utilize chemical, electrical, and high-energy beams
Situations where traditional machining processes are
unsatisfactory or uneconomical:
– Workpiece material is too hard, strong, or tough.
– Workpiece is too flexible to resist cutting forces or too difficult
to clamp.
– Part shape is very complex with internal or external profiles
or small holes.
– Requirements for surface finish and tolerances are very high.
– Temperature rise or residual stresses are undesirable or
unacceptable.
So to eliminate this disadvantages non conventional machines can be used
This presentation contains various aspects of metal cutting like mechanics of chip formation, single point cutting tool, chip breakers, types of chips,etc
Theory of metal cutting MG University(S8 Production Notes)Denny John
Theory of metal cutting MG University(S8 Production Notes)
Scenario of manufacturing process – Deformation of metals,
Schmid’s law (review only) – Performance and process parameters – single point cutting
tool nomenclature - attributes of each tool nomenclature - attributes of feed and tool
signature on surface roughness obtainable, role of surface roughness on crack initiation -
Oblique and orthogonal cutting – Mechanism of metal removal - Primary and secondary
deformation shear zones - Mechanism of chip formation, card model, types of chip,
curling of chips, flow lines in a chip, BUE, chip breakers, chip thickness ratio –
Mechanism of orthogonal cutting: Thin zone and thick zone, Merchant’s analysis – shear
angle relationship, Lee and Shaffer`s relationship, simple problems – Friction process in
metal cutting: nature of sliding friction, columb`s law, adhesion theory, ploughing, sublayer
flow – Empirical determination of force component.
Theory of Metal cutting - Principles of Metal cutting, orthogonal and oblique cutting, Merchant circle diagram, cutting forces, power requirements, Economics of machining,problems
Advanced machining processes
Utilize chemical, electrical, and high-energy beams
Situations where traditional machining processes are
unsatisfactory or uneconomical:
– Workpiece material is too hard, strong, or tough.
– Workpiece is too flexible to resist cutting forces or too difficult
to clamp.
– Part shape is very complex with internal or external profiles
or small holes.
– Requirements for surface finish and tolerances are very high.
– Temperature rise or residual stresses are undesirable or
unacceptable.
So to eliminate this disadvantages non conventional machines can be used
This presentation contains various aspects of metal cutting like mechanics of chip formation, single point cutting tool, chip breakers, types of chips,etc
Theory of metal cutting MG University(S8 Production Notes)Denny John
Theory of metal cutting MG University(S8 Production Notes)
Scenario of manufacturing process – Deformation of metals,
Schmid’s law (review only) – Performance and process parameters – single point cutting
tool nomenclature - attributes of each tool nomenclature - attributes of feed and tool
signature on surface roughness obtainable, role of surface roughness on crack initiation -
Oblique and orthogonal cutting – Mechanism of metal removal - Primary and secondary
deformation shear zones - Mechanism of chip formation, card model, types of chip,
curling of chips, flow lines in a chip, BUE, chip breakers, chip thickness ratio –
Mechanism of orthogonal cutting: Thin zone and thick zone, Merchant’s analysis – shear
angle relationship, Lee and Shaffer`s relationship, simple problems – Friction process in
metal cutting: nature of sliding friction, columb`s law, adhesion theory, ploughing, sublayer
flow – Empirical determination of force component.
Classification of Tool Materials.
For More Details
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Engineering Study Materials : https://www.youtube.com/channel/UC8vigo0VxccfcGnmJnf-ESA
Dear All, Best Greetings! This presentation is very useful to all of you to understand the steel basics, background, history, steel making process video, characteristics, metallurgical properties, iron carbon diagram, different phases in steel, effects of alloying elements, high carbon steel introduction, and application of low, medium and high carbon steel.
Chronological developments in Cutting Tool MaterialsBilal Syed
This is ap resentation showing the developments of cutting tools materials used from early life to present. their materials, properties, advantages, etc.
This slide describes two essential elements in machining operations:
cutting-tool materials and cutting fluids.
° The slide opens with a discussion of the types and characteristics of cutting tool materials.
° The properties and applications of high-speed steels, carbides, ceramics, cubic boron nitride, diamond, and coated tools are described in detail.
The types of cutting fluids in common use are then described, including their functions and how they affect the machining operation.
° Trends in near-dry and dry machining are also discussed, and their importance with respect to environmentally friendly machining operations are explained.
The selection of cutting-tool materials for a particular application is among the most important factors in machining operations, just as the selection of mold and die
materials was critical for forming and shaping processes . We will discuss throughout this slide the relevant properties and performance characteristics of all major types of cutting-tool materials, which will help us in tool selection.
However, as it will become apparent, the complex nature of this subject does not always render itself to the determination of appropriate tool materials; hence, we also must rely on general guidelines and recommendations that have been accumulated in industry over many years.More detailed information on tool material recommendations for specific workpiece materials and machining operations will be presented.
As noted, the cutting tool is subjected to
(a) high temperatures,
(b) high contact stresses, and
(c) rubbing along the tool-chip interface and along the machined surface.
Consequently, the cutting-tool material must possess the following characteristics:
° Hot hardness, so that the hardness, strength, and wear resistance of the tool are maintained at the temperatures encountered in machining operations. This property ensures that the tool does not undergo any plastic deformation and thus retains its shape and sharpness.
Toughness and impact strength (or mechanical shock resistance), so that impact forces on the tool that are encountered repeatedly in interrupted cutting operation (such as milling and turning a splined shaft on a lathe) or forces due to vibration and chatter during machining do not chip or fracture the tool.
Thermal shock resistance, to withstand the rapid temperature cycling encountered in interrupted cutting.
Wear resistance, so that an acceptable tool life is obtained before replacement is necessary.
Chemical stability and inertness with respect to the material being machined, to avoid or minimize any adverse reactions, adhesion, and tool-chip diffusion that would contribute to tool wear.
"Understanding the Carbon Cycle: Processes, Human Impacts, and Strategies for...MMariSelvam4
The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
Characterization and the Kinetics of drying at the drying oven and with micro...Open Access Research Paper
The objective of this work is to contribute to valorization de Nephelium lappaceum by the characterization of kinetics of drying of seeds of Nephelium lappaceum. The seeds were dehydrated until a constant mass respectively in a drying oven and a microwawe oven. The temperatures and the powers of drying are respectively: 50, 60 and 70°C and 140, 280 and 420 W. The results show that the curves of drying of seeds of Nephelium lappaceum do not present a phase of constant kinetics. The coefficients of diffusion vary between 2.09.10-8 to 2.98. 10-8m-2/s in the interval of 50°C at 70°C and between 4.83×10-07 at 9.04×10-07 m-8/s for the powers going of 140 W with 420 W the relation between Arrhenius and a value of energy of activation of 16.49 kJ. mol-1 expressed the effect of the temperature on effective diffusivity.
Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
Situated in Pondicherry, India, Kuddle Life Foundation is a charitable, non-profit and non-governmental organization (NGO) dedicated to improving the living standards of coastal communities and simultaneously placing a strong emphasis on the protection of marine ecosystems.
One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
Please visit our website: https://kuddlelife.org
Our Instagram channel:
@kuddlelifefoundation
Our Linkedin Page:
https://www.linkedin.com/company/kuddlelifefoundation/
and write to us if you have any questions:
info@kuddlelife.org
Willie Nelson Net Worth: A Journey Through Music, Movies, and Business Venturesgreendigital
Willie Nelson is a name that resonates within the world of music and entertainment. Known for his unique voice, and masterful guitar skills. and an extraordinary career spanning several decades. Nelson has become a legend in the country music scene. But, his influence extends far beyond the realm of music. with ventures in acting, writing, activism, and business. This comprehensive article delves into Willie Nelson net worth. exploring the various facets of his career that have contributed to his large fortune.
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Introduction
Willie Nelson net worth is a testament to his enduring influence and success in many fields. Born on April 29, 1933, in Abbott, Texas. Nelson's journey from a humble beginning to becoming one of the most iconic figures in American music is nothing short of inspirational. His net worth, which estimated to be around $25 million as of 2024. reflects a career that is as diverse as it is prolific.
Early Life and Musical Beginnings
Humble Origins
Willie Hugh Nelson was born during the Great Depression. a time of significant economic hardship in the United States. Raised by his grandparents. Nelson found solace and inspiration in music from an early age. His grandmother taught him to play the guitar. setting the stage for what would become an illustrious career.
First Steps in Music
Nelson's initial foray into the music industry was fraught with challenges. He moved to Nashville, Tennessee, to pursue his dreams, but success did not come . Working as a songwriter, Nelson penned hits for other artists. which helped him gain a foothold in the competitive music scene. His songwriting skills contributed to his early earnings. laying the foundation for his net worth.
Rise to Stardom
Breakthrough Albums
The 1970s marked a turning point in Willie Nelson's career. His albums "Shotgun Willie" (1973), "Red Headed Stranger" (1975). and "Stardust" (1978) received critical acclaim and commercial success. These albums not only solidified his position in the country music genre. but also introduced his music to a broader audience. The success of these albums played a crucial role in boosting Willie Nelson net worth.
Iconic Songs
Willie Nelson net worth is also attributed to his extensive catalog of hit songs. Tracks like "Blue Eyes Crying in the Rain," "On the Road Again," and "Always on My Mind" have become timeless classics. These songs have not only earned Nelson large royalties but have also ensured his continued relevance in the music industry.
Acting and Film Career
Hollywood Ventures
In addition to his music career, Willie Nelson has also made a mark in Hollywood. His distinctive personality and on-screen presence have landed him roles in several films and television shows. Notable appearances include roles in "The Electric Horseman" (1979), "Honeysuckle Rose" (1980), and "Barbarosa" (1982). These acting gigs have added a significant amount to Willie Nelson net worth.
Television Appearances
Nelson's char
Willie Nelson Net Worth: A Journey Through Music, Movies, and Business Ventures
CUTTING TOOL SELECTION
1. CUTTING- TOOL MATERIALS
AND CUTTING FLUIDS
Presented by
NAME : S.ARUNKUMAR
YEAR : IV YEAR
DEPARTMENT : MECHANICAL ENGINEERING
COLLEGE : SUDHARASAN ENGG COLLEGE
3. Introduction
• Cutting Tool Characteristics:
1. Maintaining hardness, strength, and wear resistance at elevated
temperatures. This property ensures that the tool does not
undergo any plastic deformation and thus retains its shape and
sharpness.
2. Toughness and impact strength (or mechanical shock resistance),
so that impact forces on the tool that are encountered repeatedly
in interrupted cutting operations or forces due to vibration and
chatter during machining do not chip or fracture the tool.
3. Thermal Shock resistance to withstand the rapid temperature
cycling encountered in interrupted cutting.
4. Wear resistance so that an acceptable tool life is obtained before
replacement is necessary.
5. Chemical stability to avoid or minimize any adverse reactions,
adhesion, and tool-chip diffusion.
5. Hardness of Cutting
Tool Materials as a
Function of
Temperature
Figure 22.1 The hardness of
various cutting-tool materials as a
function of temperature (hot
hardness). The wide range in
each group of materials is due to
the variety of tool compositions
and treatments available for that
group.
7. General Properties of Tool Materials
• The properties listed in the first column are useful in
determining desirable tool-material characteristics for a
particular application. For example,
• Hardness and strength are important with respect to the
mechanical properties of the workpiece material to be
machined.
• Impact strength is important in making interrupted cuts in
machining, such as in milling.
• Melting temperature of the tool material is important as
compared to the temperatures developed in the cutting zone.
• The physical properties of thermal conductivity and coefficient
of thermal expansion are important in determining the
resistance of the tool materials to thermal fatigue and shock.
9. HIGH SPEED STEELS
• Good wear resistance, relatively inexpensive
• Because of their toughness and high resistance to fracture, HSS are
especially suitable for:
1. high +ve rake-angle tools
2. interrupted cuts
3. machine tools with low stiffness that are subjected to vibration
and chatter.
• HSS tools are available in wrought, cast, and sintered forms
• They can be coated for improved performance
• HSS tools may also be subjected to:
a. surface treatments for improved hardness and wear resistance
such as case hardening for improved hardness and wear resistance
b. steam treatment at elevated temperatures to develop a black oxide
layer for improved performance including a reduced tendency for
built-up edge formation
10. HIGH SPEED STEELS
• Two basic types of HSS:
1. Molybdenum (M series)
• Up to about 10% Mo, with Cr, Vn, W, Co as alloying elements
2. Tungsten (T series)
• 12% -18% W, with Cr, Vn, and Co as alloying elements
• M series generally has higher abrasion resistance than T series,
undergoes less distortion during heat treating, and is less
expensive
11. HIGH SPEED STEELS
• Example 22.1: List the major alloying elements in HSS and
describe their effects in cutting tools
• Chromium improves toughness, wear resistance, and high-
temperature strength.
• Vanadium improves toughness, abrasion resistance, and hot
hardness.
• Tungsten and cobalt have similar effects, namely, improved
strength and hot hardness.
• Molybdenum improves wear resistance, toughness, and high-
temperature strength and hardness.
12. CAST-COBALT ALLOYS
• 38%-53% Co, 30%-33% Cr, and 10%-20%W
• High hardness, good wear resistance, can maintain their
hardness at elevated temperatures
• They are not as tough as HSS and are sensitive to impact forces
Stellite Tools
• These alloys are cast and ground into relatively simple tool
shapes.
• used only for special applications that involve deep continuous
roughing cuts at relatively high feeds and speeds, as much as
twice the rates possible with HSS
13. CARBIDES
• The previous tools possess the required toughness, impact strength,
and thermal shock resistance, but they also have important
limitations, particularly with respect to strength and hot hardness.
• Carbides have:
a. Hardness over a wide range of temperatures.
b. high elastic modulus and thermal conductivity.
c. low thermal expansion.
Tungsten carbide (WC):
• Composite material consisting of WC particles bonded together in
a cobalt matrix
• Manufactured with powder-metallurgy techniques
• WC particles, 1-5 μm in size
• As Co content increases, the strength, hardness, and wear
resistance of WC decrease, while its toughness increases because
of the higher toughness of cobalt
14. CARBIDES
Titanium Carbide (TiC):
• Higher wear resistance than WC but is not as tough
• With a nickel-molybdenum alloy as the matrix, TiC is suitable
for machining hard materials, mainly steels and cast irons, and
for cutting at speeds higher than those for WC.
15. COATED TOOLS
• Because of their unique properties, such as lower friction and
higher resistance to cracks and wear, coated tools can be used
at high cutting speeds, reducing both the time required for
machining operations and costs.
• Coated tools can have tool lives 10 times longer than those of
uncoated tools.
16. Relative Time Required to Machine
with Various Cutting-Tool Materials
Figure 22.6 Relative time required to machine with various cutting-tool materials, indicating the
year the tool materials were first introduced. Note that machining time has been reduced by two
orders of magnitude with a hundred years. Source: Courtesy of Sandvik.
17. COATED TOOLS - Coating Materials
Titanium Nitride coating (gold in color):
• low friction coefficient, high hardness, resistance to high
temp, and good adhesion to the substrate.
• perform well at higher cutting speeds and feeds
• Flank wear is significantly lower than that of uncoated tools
• do not perform as well at low cutting speeds because the
coating can be worn off by chip adhesion
Titanium Carbide coatings:
• on tungsten-carbide inserts have high flank-wear resistance
in machining abrasive materials
18. Typical Wear Patterns on High-
Speed-Steel Uncoated and
Titanium-Nitride Coated Tools
Figure 22.7 Schematic illustration of typical wear patterns of
high-speed-steel uncoated and titanium-nitride coated tools.
Note that flank wear is significantly lower for the coated tool.
19. COATED TOOLS - Coating Materials
Ceramics Coatings:
• Chemical inertness
• Low thermal conductivity
• Resistance to high temperature
• Resistance to flank and crater wear
• Most commonly used ceramic coating aluminum oxide
(Al2O3). However oxide coating generally bond weakly to
the substrate.
20. COATED TOOLS - Coating Materials
Multiphase Coatings:
•Functions of coatings:
1.TiN: low friction
2.Al2O3: high thermal stability
3.TiCN: fiber reinforced with a good balance of resistance to
flank and crater wear for interrupted cutting
4.A thin carbide substrate: high fracture toughness
5.A thick carbide substrate: hard and resistant to plastic
deformation at high temperatures.
Editor's Notes
Presented by
Hariharan.t
Dept of mechanical engineering,
Sudhatharsan engg college.