This document contains the answer key for a unit test on Manufacturing Technology-II. It discusses various topics related to cutting tools and machining processes, including:
1. Types of cutting tools such as single point and multipoint tools.
2. Factors that affect tool life such as rake angle, tool wear, and cutting fluids.
3. Different types of chips produced during machining such as continuous, discontinuous, and chips with built-up edge.
4. Tool materials used for different temperature ranges such as carbon steel, high-speed steel, cemented carbides, and ceramics.
5. Merchant's circle diagram which models the forces during chip formation.
In this report the basic design principles and the current state-of-the-art for cutting tools specially designed to be applied on difficult-to-cut materials are described. One by one, the main aspects involved in tool design and construction will be explained in depth over the following sections, completing a general view of the tool world, to provide easy comprehension of the whole book. Materials for the substrates, coatings, and geometry are explained, with special attention to recent developments. A section is devoted to new machining techniques such as high-feed and plunge milling, turn milling and trochoidal milling.
In this report the basic design principles and the current state-of-the-art for cutting tools specially designed to be applied on difficult-to-cut materials are described. One by one, the main aspects involved in tool design and construction will be explained in depth over the following sections, completing a general view of the tool world, to provide easy comprehension of the whole book. Materials for the substrates, coatings, and geometry are explained, with special attention to recent developments. A section is devoted to new machining techniques such as high-feed and plunge milling, turn milling and trochoidal milling.
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.
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.
Classification of Tool Materials.
For More Details
Subscribe to My YOUTUBE CHANNEL
Engineering Study Materials : https://www.youtube.com/channel/UC8vigo0VxccfcGnmJnf-ESA
Please refer this file just as reference material. More concentration should on class room work and text book methodology.
Thermal aspects of Machining, Tool materials, Tool wear Cutting fluids and Machinability.
Metal Cutting Tools : Factors affecting Tool's lifeBipico Industries
Metal cutting tools are an indispensable part of manufacturing and industrial production. Right metal cutting tool can enhance the manufacturing process with its efficiency and effectiveness. Cutting tool life is an important consideration in metal cutting processes. The life of metal cutting tool is influenced by many factors which should be duly considered at the time of buying and using the tools. Here are some of the major factors that decide the life of your metal cutting tool.
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.
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.
Classification of Tool Materials.
For More Details
Subscribe to My YOUTUBE CHANNEL
Engineering Study Materials : https://www.youtube.com/channel/UC8vigo0VxccfcGnmJnf-ESA
Please refer this file just as reference material. More concentration should on class room work and text book methodology.
Thermal aspects of Machining, Tool materials, Tool wear Cutting fluids and Machinability.
Metal Cutting Tools : Factors affecting Tool's lifeBipico Industries
Metal cutting tools are an indispensable part of manufacturing and industrial production. Right metal cutting tool can enhance the manufacturing process with its efficiency and effectiveness. Cutting tool life is an important consideration in metal cutting processes. The life of metal cutting tool is influenced by many factors which should be duly considered at the time of buying and using the tools. Here are some of the major factors that decide the life of your metal cutting tool.
Mechanics of chip formation, single point cutting tool, forces in machining, Types of chip, cutting tools– nomenclature, orthogonal metal cutting, thermal aspects, cutting tool materials, tool wear, tool life, surface finish, cutting fluids and Machinability.
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It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
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Author: Robbie Edward Sayers
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1. DEPARTMENT OF MECHANICAL ENGINEERING
ACADEMIC YEAR 2017 -2018 EVEN SEMESTER
ME6402 & Manufacturing Technology–II
UNIT TEST - I -ANSWER KEY
PART – A
1. Typesofcutting tool:
Single point cutting tool
Multipoint cutting tool
2. Tool signature:
The various angles of tools are mentioned in a numerical number in a particular order. This
order is known as tool signature.
3. Effectof rakeangleduringcutting:
Rake angle has a great effect on the cutting forces. Increasing and decreasing or keeping the rake
angle negative and positive, the cutting force and power increases and decreases respectively. A
higher value of rake angle weakens the cutting edge.
4. Chipthicknessratio:
The ratio of chip thickness before cutting to chip thickness after cutting is called chip thickness
ratio.
Chip thickness ratio, r = t1/t2
5. Tool life:
Tool life is defined as the time elapsed between two consecutive tool resharpening. During this
period, the tool serves effectively and efficiently.
6. Reasonfor lubricationisnotrequiredwhile machiningcastiron:
The high carbon content in cast iron is present in the form of graphite. It acts a self cooling agent
while machining the cast iron.
2. PART – B
7. (A) (i) Metal CuttingProcess:
A cutting tool exerts compressive force on the work piece which stresses the work material
beyond the yield point and therefore metal deform plastically and shears off.
Plastic flow takes place in a localized region called the shear plane.
Sheared material begins to flow along the cutting toolface in the form of chips.
Applied compressive force whichleads to formation of chips is called cutting force.
Heat produced during shearing action raises the temperature of the work piece, cutting tool
and chips.
Temperature rise in cutting toolsoftens and causes loss of keenness in cutting edge.
Cutting force,heat and abrasive wear are important features in metal cutting.
(ii)Comparisonoforthogonal and obliquemetal cuttingprocesses:
Sl.No Orthogonal metal cutting Oblique metal cutting
1. Cutting edge of the tool is perpendicular
to the direction of tool travel.
The cutting edge is inclined at an angle less
than 90O to the direction of tool travel.
2. The direction of chip flow is
perpendicular to the cutting edge.
The chip flows on the tool face making an
angle.
3.
The chip coils in a tight flat
spiral The chip flowssideways in a long curl.
4.
For same feed and depth of cut the force
which shears the metal acts on smaller
areas. So the life of the toolis less.
The cutting force acts on larger area and so
tool life is more.
5. Produces sharp corners. Produces a chamfer at the end of the cut
6. Smaller length of cutting edge is in
contactwith the work.
For the same depth of cut greater length of
cutting edge is in contact withthe work.
7.
Generally parting off in lathe, broaching
and slotting operations are done in this
method.
This method of cutting is used in almost all
machining operations.
3. (B) Varioustypesofchipsproducedinmachiningprocess:
Chips are separated from the workpiece to impart the required size and shape. The chips
that are formed during metal cutting operations can be classified into three types:
a. Continuous chips:
Chip is produced when there is low friction between the chip and tool face.
This chip has the shape of long string or curls into a tight roll.
Chip is produced when ductile materials such as Al, Cu, M.S, and wrought Iron are
machined.
Formation of very lengthy chip is hazardous to the machining process and the
machine operators.
It may wrap up on the cutting tool, workpiece and interrupt in the cutting operation.
It becomes necessary to deform or break long continuous chips into small pieces.
It is done by using chip breakers and this can be an integral part of the tool design or a
separate device.
b. Discontinuous or segmental chips:
Chip is produced in the formof small pieces.
These types of chips are obtained while machining brittle material like cast iron, brass
and bronze at very low speeds and high feeds.
For brittle materials it is associated with fair surface finish, lower power consumption
and reasonable tool life.
4. c. Continuous chips with built-up edge:
When high friction exists between chip and tool, the chip material welds itself to the tool
face.
Welded material increases friction further which in turn leads to the building up a layer
upon layer of chip material.
Build up edge grows and breaks down when it becomes unstable.
Chips with build-up edge result in higher power consumption, poor surface finish and large
tool wear.
8. (A) (i) Tool Wear:
The various types of tool wears are,
a.Flank wear:
Occursbetween tool and workpiece interface.
b.Crater wear:
Due to pressure of the hot chip sliding up the face of the tool, crater or a
depression is formed on the faceof tool. (Ductilematerials)
By diffusion shape of crater formed corresponds to the shape of underside of the
chip
c.Nose wear:
Mechanical chipping of nose an cutting edge of the tool are commonly observed
causes fortool failure.
This type of failure is pronounced in carbide tipped and diamond tools due to high
brittleness of tool material.
5. (ii)Cutting fluids:
Used to carry away the heat produced during machining.
Functions of cutting fluids:
Cools the tool and workpiece
Lubricates the cutting tool
Reduces co-efficientof frictionbetween tool and workpiece
Improves surface finish
Causes the chip to break up into small pieces
Washes away the chips from the tool
Prevents corrosion of workand machine
Properties of cutting fluids:
Should possess good lubricating properties
Should have high heat absorbing capacity
Should have high specific heat
Should be odorless
Should be non-corrosive
Should have low viscosity
Should be harmless
Should not stain
Should be economical
Should be transparent
Types of cutting fluids:
Water based cutting fluids
Straight or heat oil based cutting fluids
Mineral oils
Straight fatty oils
Mixed oils
Sulphurised oils
Chlorinated oils
Methods of applying cutting fluids:
Flood under gravity
Form of liquid jet
6. (B) Given:
V1=110m/min
T1=20min
V2=85m/min
T2=40min
Solution:
From Taylor’s tool life equation,
V1 (T1)n=V2 (T2)n
n=0.372…………………………………………….(ANS)
V1 (T1)n=C
C=335.26…………………………………………..(ANS)
95m/min speed,
T=29.66m/min…………………………………..(ANS)
For 30 min life,
V=94.6m/min……………………………………..(ANS)
PART – C
9. (A) CuttingTool Materials:
Selection of cutting tool material depends on
Volume of production
Tooldesign
Type of machining process
Physicaland chemical properties of work material
Rigidity and condition of machine
Properties / Characteristics of cutting tool material
Hot hardness
Wear resistance
Toughness
Low friction
Cost of tool
Types of tool materials:
a. Carbon toolsteel- with stand temperature up to 200oC
b. High Speed steel- withstand temperature up to 900oC
18-4-1 high speed steel
Molybdenum high speed steel
Cobalt high speed steel
7. c. Cemented carbides- with stand temperature up to 1500oC
d. Ceramics- with stand temperature up to 1700oC
e. Diamonds- withstand temperature up to 1250oC
f. Cubic boron nitride- with stand temperature up to 1500oC
(b) Merchantcirclediagramofforces:
The followingassumptions are made by merchant to workout the force relations.
The chip may be considered as a separate body held in equilibrium under the action of
twoequal, opposite and collinear resultant forces.i.e. F and F’
The chip formation will be continuous without built up edge
During cutting process, the cutting velocity remains constant.
The cutting tool has a sharp cutting edge so that it does not make a flank contact with the
workpiece.