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Posted: August 29th, 2024
In a kinematic chain when one link is fixed, then that chain is known as mechanism. It may be used for transmitting or transforming motion for example engine indicators, typewriters etc.[1]
A mechanism which has four links is known as simple mechanism, and a mechanism which has more than four links is known as complex mechanism. A mechanism which is required to transmit some particular type of work is knows as machines. In certain cased the elements have to be designed to withstand the forces safely.
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A mechanism is a kinematic chain in which kinematic pairs are connected in such a way that first link is joined to the last link to transmit a predetermined constrained motion
The various parts of the mechanism are called as links or elements. When two links are in contact and a relative motion is possible, then they are known as a pair. An arbitrary set of a link which forms a closed chain which is capable of relative motion and that can be made into a rigid structure by adding a single link is known as kinematics chain. To form a mechanism from a kinematics chain one of the link must be fixed. The technique obtaining different mechanism by fixing the various link in turn is knows as inversion. [2]
Two links that can move with respect to each other by a mechanical constraint between them, with one or more degrees of freedom
The relative motion between two links of a pair can take different form. Three types of pair are identified as lower pairs and these are the commonly occurring ones.
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Sliding: Such as occurs between a piston and a cylinder
Turning: Such occurs with a wheel on an axle
Screw Motion: Such as occurs between a nut and a bolt
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All other cases are considered to be combination of sliding and rolling is called higher pairs. Screw pair is higher pair as it combines turning and sliding.
Since kinematics pairs deals with relative motion between two links then can be classifies based on the characteristics of relative motion between two bodies.
The type of relative motion between the elements
The type of contact between the elements
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The type of closure[1]
The kinematic pair according to type of relative motion can classified as below
Sliding Pair
Turning Pair
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Rolling Pair
Screw Pair
Spherical Pair
The kinematic pair according to type of contact between the elements can be classified
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Lower Pair
Higher Pair
The kinematic pair according to type of closure between the elements can be classified as
Self -Closed Pair
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Force -Closed Pair
The Grubler’s criterion applies to mechanism with only single degree of freedom joints where the overall movability of the mechanism is unity.Subtituting n=1 and h=0 in kutzbach equation we have [3]
The equation is known as Grubler’s criterion for plane mechanisms with constrained motion.
Where, F=number of degrees of freedom of a chain
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j= number of lower kinematic pairs
h = number of higher kinematic pairs
n= number of links
When F=1, the linkage is called a mechanism.
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When F=0 it forms a structure. That is an application of external force does not produce relative motion between any links of a linkage
When F>1 the linkage will require more than one external driving force 2 obtain constrained motion
When F<1 there is one redundant member and that the chain is statically indeterminate structure
A Kinematic Chain is defined as a closed network of links, connected by kinematic pairs so that the motion is constrained.
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First a network of links to give constrained motion, certain conditions are to be satisfied. Minimum number of three links is required to form a closed chain .The three links are connected with turning pairs.
The most important kinematic chains are those which consists of four lower pairs, each pair being a sliding pair or a turning pair
Inversion is a method of obtaining different mechanisms by fixing different links in a kinematic chain. A particular inversion of a mechanism may give rise to different mechanism of practical unity, when the proportions of the link are changed [2].
Slotted link mechanism which is commonly used in shaper mechanism. The mechanism which converts rotary motion of electric motor and gear box into the reciprocating motion of ram which is the most simple and compact machine.[3]
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The slotted link mechanism which is mainly divided into seven main parts .They are
A – Clamping nut
B – Ram
C – Link D
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D – Crankpin A
E – Slotted crank B
F – Bull Wheel
G – Glot
Slotted link mechanism gives ram the higher velocity during the return stroke (i.e. Non cutting stroke) .Then the forward stroke which reduces the wasting during the return stroke. [4]
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When the bull wheel is rotated the crank pin A is also rotated side by side through the slot the crank B. This makes the slotted crank B.This makes the slotted crank to oscillate about one end C.The oscillation motion of slotted crank makes ram to reciprocate. The intermediate D is required to accommodate the rise and fall of the crank.
Crank Pin A decides the length of the strokes of the shaper. The further it’s away from the center of the bull wheel longer is its stroke.
The cutting stroke of the ram is complete while crank pin moves from A to A1 and slotted link goes from left to right.
During return stroke pin moves from A1 to A and link moves from right to left
The working of a shaper mechanism is that it has two stokes. One is forward stroke and the other is return stroke. Clearing up more about these two strokes is that in the forward stroke the material is feeded, where as in the return stroke is an idle stroke when no material is feeded.[6]
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Shaping process which involves only short setup time and uses only inexpensive tools. Shaping is used for the production of gears ,splined shafts racks etc. it can produce one or two such parts in a shaper less time that is required to setup for production. Other alternatively equipment with a higher output rate is required. [5]
The cost per cubic cm of metal removal by shaping may be as five times more than that of the removal by milling or broaching. Shaping machines are mainly used in tool rooms or model shops.
The cutting speed depends on
The type of material used.
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The amount of material removed.
The kinds of tool material.
The rigidity of machine.
Maximum pressure is holding the ram down the slides so that steadying is most necessary on entering the cut
In Whitworth motion, the main pressure is in the correct place, less pressure is required in center of stroke.
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Slotted link motion is opposite to all the points explained above.
Not withstanding the recompense stated above for the Whitworth motion, constructional difficulty make it more suitable for traversing head shaping machines and slotting machines, so that the crank motion, despite its restrictions finds universal adaptation for the pillar style of shaping machines.[6]
Design and fabrication of crank and slotted lever mechanism and also doing the structural and thermal analysis of crank shaft. Drawing the velocity diagram of the mechanism.
The design of different components is explained here using Catia.
Slotted lever connected to the crank shaft which provides the forward and backward motion of the tool post. The drawing is done as per the dimensions shown above. Different view of the slotted lever is also explained
Crank shaft which is connected to flywheel with the help of a motor , which provides the rotation of the crank shaft as well as the rotation of the slotted lever connected to it. The drawing is done as per the dimensions shown above. Different view of the crank shaft is also explained
Tool post which is connected to slotted lever, where the tool is connected to it which is used for the cutting of materials. The drawing is done as per the dimensions shown above. Different view of the Tool post is also explained
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Tool cutter is connected to the tool which is used to cut the material. The design is done as per assumed dimensions. Different view of the Tool is also explained.
With the help of above design of different components it has been combined together to form a crank and slotted lever mechanism which is seen mainly in shaper machines.
The final fabrication model will be represented as shown below.
To conclude my Assigned project I hereby affix few photos of crank and slotted quick return mechanism indicating the functioning the same.
Crank and slotted lever mechanism, crank shaft which acts as the rotating device which helps the slotted lever forward and backward movement. Therefore analyzing the different propertied which take place in a crank shaft
Unit System
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Metric (m, kg, N, s, V, A) Degrees rad/s Celsius
Angle
Degrees
Rotational Velocity
rad/s
Temperature
Celsius
Object Name
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Geometry
State
Fully Defined
Source
C:UsersPATRICKDesktopPAPArollcageSUDEEPPart1.CATPart
Type
Catia5
Length Unit
Millimeters
Element Control
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Program Controlled
Display Style
Part Color
Length X
2.e-002 m
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Length Y
0.20055 m
Length Z
0.19999 m
Volume
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6.2904e-004 m³
Mass
4.938 kg
Scale Factor Value
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1.
Bodies
1
Active Bodies
1
Nodes
3258
Elements
556
Mesh Metric
None
Import Solid Bodies
Yes
Import Surface Bodies
Yes
Import Line Bodies
No
Parameter Processing
Yes
Personal Parameter Key
DS
CAD Attribute Transfer
No
Named Selection Processing
No
Material Properties Transfer
No
CAD Associatively
Yes
Import Coordinate Systems
No
Reader Save Part File
No
Import Using Instances
Yes
Do Smart Update
No
Attach File Via Temp File
Yes
Temporary Directory
C:UsersPATRICKAppDataLocalTemp
Analysis Type
3-D
Mixed Import Resolution
None
Enclosure and Symmetry Processing
Yes
Object Name
Part 1
State
Meshed
Visible
Yes
Transparency
1
Suppressed
No
Stiffness Behavior
Flexible
Coordinate System
Default Coordinate System
Reference Temperature
By Environment
Assignment
Structural Steel
Nonlinear Effects
Yes
Thermal Strain Effects
Yes
Length X
2.e-002 m
Length Y
0.20055 m
Length Z
0.19999 m
Volume
6.2904e-004 m³
Mass
4.938 kg
Centroid X
1.e-002 m
Centroid Y
-1.9072e-004 m
Centroid Z
-1.9565e-004 m
Moment of Inertia Ip1
2.4661e-002 kg·m²
Moment of Inertia Ip2
1.2451e-002 kg·m²
Moment of Inertia Ip3
1.2537e-002 kg·m²
Nodes
3258
Elements
556
Mesh Metric
None
Object Name
Global Coordinate System
State
Fully Defined
Type
Cartesian
Ansys System Number
0.
Origin X
0. m
Origin Y
0. m
Origin Z
0. m
X Axis Data
[ 1. 0. 0. ]
Y Axis Data
[ 0. 1. 0. ]
Z Axis Data
[ 0. 0. 1. ]
Object Name
Mesh
State
Solved
Physics Preference
Mechanical
Relevance
0
Use Advanced Size Function
Off
Relevance Center
Coarse
Element Size
Default
Initial Size Seed
Active Assembly
Smoothing
Medium
Transition
Fast
Span Angle Center
Coarse
Minimum Edge Length
2.e-002 m
Use Automatic Tet Inflation
None
Inflation Option
Smooth Transition
Transition Ratio
0.272
Maximum Layers
5
Growth Rate
1.2
Inflation Algorithm
Pre
View Advanced Options
No
Shape Checking
Standard Mechanical
Element Midside Nodes
Program Controlled
Straight Sided Elements
No
Number of Retries
Default (4)
Rigid Body Behavior
Dimensionally Reduced
Mesh Morphing
Disabled
Pinch Tolerance
Please Define
Generate on Refresh
No
Nodes
3258
Elements
556
Mesh Metric
None
Object Name
Static Structural (C5)
State
Solved
Physics Type
Structural
Analysis Type
Static Structural
Solver Target
ANSYS Mechanical
Environment Temperature
22. °C
Generate Input Only
No
Object Name
Analysis Settings
State
Fully Defined
Number Of Steps
1.
Current Step Number
1.
Step End Time
1. s
Auto Time Stepping
Program Controlled
Solver Type
Program Controlled
Weak Springs
Program Controlled
Large Deflection
Off
Inertia Relief
Off
Force Convergence
Program Controlled
Moment Convergence
Program Controlled
Displacement Convergence
Program Controlled
Rotation Convergence
Program Controlled
Line Search
Program Controlled
Calculate Stress
Yes
Calculate Strain
Yes
Calculate Results At
All Time Points
Solver Files Directory
F:ansyshallo_filesdp0SYS-1MECH
Future Analysis
None
Scratch Solver Files Directory
Save ANSYS db
No
Delete Unneeded Files
Yes
Nonlinear Solution
No
Solver Units
Active System
Solver Unit System
mks
Object Name
Rotational Velocity
State
Fully Defined
Geometry
All Bodies
Define By
Vector
Magnitude
200. rad/s (ramped)
Axis
Defined
Suppressed
No
Object Name
Frictionless Support
State
Fully Defined
Scoping Method
Geometry Selection
Geometry
1 Face
Type
Frictionless Support
Suppressed
No
Object Name
Solution (C6)
State
Solved
Max Refinement Loops
1.
Refinement Depth
2.
Object Name
Solution Information
State
Solved
Solution Output
Solver Output
Newton-Raphson Residuals
0
Update Interval
2.5 s
Display Points
All
Object Name
Total Deformation
Minimum Principal Elastic Strain
Stress Intensity
Middle Principal Stress
Equivalent Stress
State
Solved
Scoping Method
Geometry Selection
Geometry
All Bodies
Type
Total Deformation
Minimum Principal Elastic Strain
Stress Intensity
Middle Principal Stress
Equivalent (von-Mises) Stress
By
Time
Display Time
Last
Calculate Time History
Yes
Identifier
Use Average
Yes
Minimum
8.5255e-009 m
-8.1173e-006 m/m
5.3895e+005 Pa
-4.8689e+005 Pa
5.3642e+005 Pa
Maximum
7.9016e-007 m
-8.1177e-007 m/m
3.0171e+006 Pa
1.2909e+006 Pa
2.7325e+006 Pa
Time
1. s
Load Step
1
Substep
1
Iteration Number
1
Object Name
Shear Stress
Vector Principal Elastic Strain
Strain Energy
State
Solved
Scoping Method
Geometry Selection
Geometry
All Bodies
Type
Shear Stress
Vector Principal Elastic Strain
Strain Energy
Orientation
XY Plane
By
Time
Display Time
Last
Coordinate System
Global Coordinate System
Calculate Time History
Yes
Use Average
Yes
Identifier
Minimum
-3.4345e+005 Pa
5.6327e-007 J
Maximum
3.4345e+005 Pa
1.1931e-005 J
Time
1. s
Load Step
1
Substep
1
Iteration Number
1
Density
7850 kg m^-3
Coefficient of Thermal Expansion
1.2e-005 C^-1
Specific Heat
434 J kg^-1 C^-1
Thermal Conductivity
60.5 W m^-1 C^-1
Resistivity
1.7e-007 ohm m
Compressive Ultimate Strength Pa
0
Compressive Yield Strength Pa
2.5e+008
Tensile Yield Strength Pa
2.5e+008
Tensile Ultimate Strength Pa
4.6e+008
Alternating Stress Pa
Cycles
Mean Stress Pa
3.999e+009
10
0
2.827e+009
20
0
1.896e+009
50
0
1.413e+009
100
0
1.069e+009
200
0
4.41e+008
2000
0
2.62e+008
10000
0
2.14e+008
20000
0
1.38e+008
1.e+005
0
1.14e+008
2.e+005
0
8.62e+007
1.e+006
0
Strength Coefficient Pa
Strength Exponent
Ductility Coefficient
Ductility Exponent
Cyclic Strength Coefficient Pa
Cyclic Strain Hardening Exponent
9.2e+008
-0.106
0.213
-0.47
1.e+009
0.2
Relative Permeability
10000
Temperature C
Young’s Modulus Pa
Poisson’s Ratio
2.e+011
0.3
Thermal Analysis is the heat developed in crank shaft.
Unit System
Metric (m, kg, N, s, V, A) Degrees rad/s Celsius
Angle
Degrees
Rotational Velocity
rad/s
Temperature
Celsius
Object Name
Geometry
State
Fully Defined
Source
C:UsersPATRICKDesktopPAPArollcageSUDEEPPart1.CATPart
Type
Catia5
Length Unit
Millimeters
Element Control
Program Controlled
Display Style
Part Color
Length X
2.e-002 m
Length Y
0.20055 m
Length Z
0.19999 m
Volume
6.2904e-004 m³
Mass
4.938 kg
Scale Factor Value
1.
Bodies
1
Active Bodies
1
Nodes
3258
Elements
556
Mesh Metric
None
Import Solid Bodies
Yes
Import Surface Bodies
Yes
Import Line Bodies
No
Parameter Processing
Yes
Personal Parameter Key
DS
CAD Attribute Transfer
No
Named Selection Processing
No
Material Properties Transfer
No
CAD Associativity
Yes
Import Coordinate Systems
No
Reader Save Part File
No
Import Using Instances
Yes
Do Smart Update
No
Attach File Via Temp File
Yes
Temporary Directory
C:UsersPATRICKAppDataLocalTemp
Analysis Type
3-D
Mixed Import Resolution
None
Enclosure and Symmetry Processing
Yes
Object Name
Part 1
State
Meshed
Visible
Yes
Transparency
1
Suppressed
No
Stiffness Behavior
Flexible
Coordinate System
Default Coordinate System
Reference Temperature
By Environment
Assignment
Structural Steel
Nonlinear Effects
Yes
Thermal Strain Effects
Yes
Length X
2.e-002 m
Length Y
0.20055 m
Length Z
0.19999 m
Volume
6.2904e-004 m³
Mass
4.938 kg
Centroid X
1.e-002 m
Centroid Y
-1.9072e-004 m
Centroid Z
-1.9565e-004 m
Moment of Inertia Ip1
2.4661e-002 kg·m²
Moment of Inertia Ip2
1.2451e-002 kg·m²
Moment of Inertia Ip3
1.2537e-002 kg·m²
Nodes
3258
Elements
556
Mesh Metric
None
Object Name
Global Coordinate System
State
Fully Defined
Type
Cartesian
Ansys System Number
0.
Origin X
0. m
Origin Y
0. m
Origin Z
0. m
X Axis Data
[ 1. 0. 0. ]
Y Axis Data
[ 0. 1. 0. ]
Z Axis Data
[ 0. 0. 1. ]
Object Name
Mesh
State
Solved
Physics Preference
Mechanical
Relevance
0
Use Advanced Size Function
Off
Relevance Center
Coarse
Element Size
Default
Initial Size Seed
Active Assembly
Smoothing
Medium
Transition
Fast
Span Angle Center
Coarse
Minimum Edge Length
2.e-002 m
Use Automatic Tet Inflation
None
Inflation Option
Smooth Transition
Transition Ratio
0.272
Maximum Layers
5
Growth Rate
1.2
Inflation Algorithm
Pre
View Advanced Options
No
Shape Checking
Standard Mechanical
Element Midside Nodes
Program Controlled
Straight Sided Elements
No
Number of Retries
Default (4)
Rigid Body Behavior
Dimensionally Reduced
Mesh Morphing
Disabled
Pinch Tolerance
Please Define
Generate on Refresh
No
Nodes
3258
Elements
556
Mesh Metric
None
Object Name
Steady-State Thermal (D5)
State
Solved
Physics Type
Thermal
Analysis Type
Steady-State
Solver Target
ANSYS Mechanical
Generate Input Only
No
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