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ASSEMBY MODEL OF A BENCHVICE AND ITS ANALYSIS
Project Report for the course
ME4191 CAD/CAM LABORATORY
Submitted in partial fulfillment of the requirements for the award of the degree of
Bachelor of Technology
in
Mechanical Engineering
by
ATHUL JOHN VARGHESE ( Roll No: B110225ME, Semester: 7)
GEORGE T MANI ( Roll No: B110059ME, Semester: 7)
GOKUL V NAIR ( Roll No: B110073ME, Semester: 7)
Department of Mechanical Engineering
NATIONAL INSTITUTE OF TECHNOLOGY, CALICUT
NOVEMBER 2014
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CONTENTS
1. INTRODUCTION
2. THEORY
CONSTRUCTION
FUNCTION
BENEFITS
3. BENCH WISE ASSEMBLY
4. STRUCTURAL ANALYSIS OF EACH PARTS IN ANSYS
STRUCTURAL ANALYSIS OF THE BASE
STRUCTURAL ANALYSIS OF THE MOVING PART
STRUCTURAL ANALYSIS OF THE ROTATING ARM
5. RESULT & DISCUSSIONS
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LIST OF FIGURES
Figure 1 : The bench vice assembly
Figure 2 : Various views and dimensions of the base
Figure 3 : Views and dimensions of vice jaw
Figure 4 : Views and dimensions of various components of bench vice assembly
Figure 5 : Meshed view of base
Figure 6 : Deformed view of base
Figure 8 : Figure 8: Contour plot showing stress distribution when P = 100Pa and P =1000Pa
Figure 9: Deformed view of the flat side
Figure 10 : Contour plot showing stress distribution in moving part
Figure 11: Contour plot showing bending stresses in the arm
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INTRODUCTION
A vice is a mechanical apparatus used to secure an object to allow work to be performed on
it. Vices have two parallel jaws, one fixed and the other movable, threaded in and out by a
screw and lever.Each part of the benchvice were made in Creo and assembled. Structural
analysis of each part was done in Ansys using arbitrary load values.
THEORY
A bench vice is a vice that is attached to a bench. When people say vice they are almost
always talking about a bench vice. It is a device for firmly holding an object that someone is
working on. It consists of two flat jaws--one fixed and the other movable--that can be brought
together with a screw mechanism
Construction
Vices exist in a variety of sizes from those designed for the jeweler's bench to those designed
for the blacksmith's bench. They are all designed to hold something firmly while it is being
worked on. The nature of the worked substance determines the size of the vice. The nature of
the worked substance also determines the construction of the jaws of the vice
Function
The function of a vice is to hold something firmly. This is accomplished by having two jaws
that can be brought together with smoothly incremental force, then locked in place. This must
be done without damaging the object that is being held. It is also important that the vice holdan object steady while it is being worked on and that is why vices are mounted on benches
Benefits
The benefits of a bench vice are grip and stability. Grip is so important that stability is
sometimes sacrificed--as in the hand vice. This is a small handheld device that exists only to
provide a grip on small slippery objects. The hand vice grips the object and the worker grips
the hand vice. The stability factor is exactly why most vices are attached to benches
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BENCHVICE ASSEMBLY
Figure 1 : The bench vice assembly
Figure 2: Various views and dimensions of the base
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Figure 3: Views and dimensions of vice jaw
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Figure 4: Views and dimensions of various components of bench vice assembly
STRUCTURAL ANALYSIS OF EACH PARTS IN ANSYS
Material properties of steel (Young’s modulus: 200 GPa, poissons’s ratio: 0.3) was given to
all parts for analysis.
STRUCTURAL ANALYSIS OF THE BASE
The part was imported as a parasolid from creo. Volumes of the solid where meshed.
Figure 5: Meshed view of base Figure 6: Deformed view of base
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The bottom area was fixed and and an arbitrary load values of 100Pa and 1000Pa was applied
on the jaw area. The Von Mises stress distribution obtained is shown:
Figure 8: Contour plot showing stress distribution when P = 100Pa and P =1000Pa (below)
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STRUCTURAL ANALYSIS OF THE MOVING PART
A force of 1000Pa was given on the flat side of the moving part keeping the area of shaft
fixed and the result obtained shows considerable stresses on acting on the fixed area that
more application of load will cause yielding.
Fig 9: Deformed view of the flat side Fig 10 : Contour plot showing stress distribution
STRUCTURAL ANALYSIS OF THE ROTATING ARM
There is a bending stress in the arm when both the jaws are tightened which is analyzed by
keeping one end fixed and a normal force acting on the other end.An arbitrary value of 100N
was taken and the plots for the same are given below.
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RESULT & DISCUSSIONS
The assembly model of a benchvice was made and analysed successfully using CAD
softwares.
Successive iterative analysis were done on parts of the benchvice to know there behaviorunder different values of loads. It showed that a load above 1000Pa will lead to failure of the
edge in the base. Similar observation can be made in the case of moving part were stresses
are localized in the fixed area of shaft. Also bending stresses developed in the arm when a
force of 100N is applied is calculated.