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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.