Bench Vice

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

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

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

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 hold an 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

BENCHVICE ASSEMBLY

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

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

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)



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.

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 behavior under 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.