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International Journal of Engineering Inventions
e-ISSN: 2278-7461, p-ISSN: 2319-6491
Volume 2, Issue 11 (July 2013) PP: 21-24
www.ijeijournal.com Page | 21
Modeling and Analysis of Clamp for Brake Spider Fixture by
Fem Using Ansys Software
Dr.Yadavalli Basavaraj1
, Pavan Kumar B. K.2
, Varun B. V.3
, Sumanth G.4
1
Professor & Head, Dept.of Mechanical Engineering. Ballari Institute of Technology and Management, Bellary.
Karnataka. India
2
Asst. Professor, Dept. of Mechanical Engineering. Ballari Institute of Technology and Management, Bellary.
Karnataka. India
3, 4
Student, Dept. of Mechanical Engineering. Ballari Institute of Technology and Management, Bellary,
Karnataka, India
Abstract: A fixture is designed and built to hold, support and locate every component to ensure that each is
drilled or machined with accuracy and manufactured individually. A brake spider includes a spider body with a
central opening and a slot for receiving a camshaft and bracket assembly. The brake spider is attached to axle
housing via the central opening. The form to be used depends on the shape and requirement of the work piece to
be machined. In the existing fixture, used for modeling brake spider component, only five components were
machined per hour. In the present work, detailed study of brake spider component is carried out and design is
modified to increase the productivity. The new fixture design is carried out by using CATIA V5 modeling
software and it is critically evaluated for the failure of clamp component, by finite element method (FEM) using
ANSYS software. This modified design is adapted in the fabrication of fixture and is tested for its productivity. It
is found that there is a considerable enhancement in the productivity to seven components per hour with
required accuracy.
Key Words: Fixture; clamp; ansys; brake spider; CATIA V5; FEM
I. Introduction
Over the past century, manufacturing has made considerable progress. New machine tools, high-
performance cutting tools, and modern manufacturing processes enable today's industries to make parts faster
and better than ever before. Although work holding methods have also advanced considerably, the basic
principles of clamping and locating are still the same. The fixtures must satisfy the conditions like reduction of
ideal time, cleanliness, provision for coolant.
II. Literature survey
A brief review of contemporary research supporting this paper is presented below. The study of Dr. Yu
Zheng presents a method for finding form-closure locations with enhanced immobilization capability. Fixtures
are used in many manufacturing processes to hold objects. Fixture layout design is to arrange fixturing elements
on the object surface such that the object can be held in form-closure and totally immobilized.
In contrast to concentration of six axis nano positioning method Dr.Patrick J. Golden tested a unique
dovetail fretting fatigue fixture was designed and evaluated for testing turbine engine materials at room or
elevated temperatures. Initial test results revealed interesting variability in the behavior of the nickel based super
alloy specimens at elevated temperature.
K.C. Aw paper concentrates on electronic equipment used for maritime application. Simulation using
ANSYS workbench software was performed to comprehend the effect of various parameters of accelerated
testing performed on these waterproof enclosures. Experiments were performed to examine the correlation with
simulation results.
The above mentioned strategy was applied to reduce the buckling in a part of fixture design assembly.
But our main objective of the project is to increase the productivity with required accuracy.
III. Objectives
 As design of the fixture for the component cannot happen in isolation, the objective of the project also
extends to the aspects like the features of the vertical machining center.
 Process planning, cycle time estimation and designing of the fixture for the brake spider component is
carried out.
 Critical component of the fixture would be analyzed from stress and deflection view.
Modeling And Analysis Of Clamp For Brake Spider Fixture By Fem Using Ansys Software
www.ijeijournal.com Page | 22
IV. Fixture design
Fixture planning is to conceptualize a basic fixture configuration through analyzing all the available
information regarding the material and geometry of the work piece, operations required, processing equipment
for the operations and the operator.
 Method of locating.
 Design the clamping method.
 Design any supports required.
 Design the base required.
 Design the fixture body.
4.1 Cycle time estimation
The design of fixtures should be such that the process of loading and unloading the components takes
the minimum possible time and enables on easy loading.
Table 1: Cycle time estimation
Total cycle time 6.40 minutes
Load and unload time 2 minutes
Total time 8.40 minutes
No. of components / hour 7.142 numbers
Hence, the production rate of brake spider component is seven components per hour.
V. Brake spider component
A brake spider includes a spider body with a central opening and a slot for receiving a camshaft and
bracket assembly. The brake spider is attached to axle housing via the central opening. The slot is defined by an
inner surface that does not completely surround the camshaft.
Fig 1: 3D front view and side view model of brake spider component
VI. Assembly of brake spider fixture
Fig 2 : 3D Isometric view model of assembly of brake spider fixture design
 Study of the brake spider component and the existing fixture in use.
 Study of the process planning: Estimation of the process for achieving the final dimensions of the
components, selection of tools, tool holders, insert grades, cutting parameters and arriving at the cycle
time of the component.
Clamp
Modeling And Analysis Of Clamp For Brake Spider Fixture By Fem Using Ansys Software
www.ijeijournal.com Page | 23
 Fixturing concept: As per the fixture clamp dimensions the vertical machining center is selected and
conceptualized design is done by arresting six degrees of freedom by resting, locating, orienting and
clamping.
 Detailed design: Assembly drawing of the brake spider fixture using CATIA V5 modeling software is
carried out.
 Analysis of critical components: Static deflection analysis of key element of fixture clamp using ANSYS
software.
VII. Static analysis of clamp
The procedure for a static analysis consists of these tasks:
1. Set the analysis title
2. Preferences
3. Preprocessor
 Element type
 Real constant
 Material properties
 Model generation
 Applying boundary conditions
4. Review of result
The detailed steps in performing static deflection of base plate through finite element approach are as
follows:
a. Set the analysis title: “Static deflection of clamp”
b. Preferences: Structural, Discipline: h method
c. Preprocessor:
 Element type: The elements chosen for the present work is SOLID-45.
 Material properties:
Modulus of elasticity of steel= 2 x 105
N/mm2
Poisson’s ratio = 0.3
Density = 7800 N/mm3
.
 Model generation:
The model is imported from CATIA V5 and the meshing has been carried out using Ansys-mesh tool.
 Boundary conditions:
Fig 3: Boundary conditions, stress distribution and static deflection applied on clamp
A force of 6968N obtained from theoretical calculation is applied on the middle portion of clamp as
shown in above Fig 3. The bottom face of the clamp is constrained to all degrees of freedom.
VIII. Conclusions
1. In the current work, the following conclusion is outlined.
 The fixture for brake spider component machining as per the customer requirements has been attempted
successfully, in order to increase the productivity.
2. The static analysis of the clamp component of the designed fixture carried out by finite element method
using ANSYS software is summarized as follows.
 Maximum cutting force and maximum clamping force employed for the analysis are 6968N and 20904N
respectively.
Modeling And Analysis Of Clamp For Brake Spider Fixture By Fem Using Ansys Software
www.ijeijournal.com Page | 24
 Maximum static deflection of clamp part of the fixture is found to be 0.18 x 10-05
mm and maximum
stress (Von mises) is found to be 1.72Mpa. These values are within specified limits which are shown in Fig
References
[1]. S. Ratchev , K. Phuah, S. Liu, “FEA-based methodology for the prediction of part– fixture behavior and its applications” School
of M3, University of Nottingham, United Kingdom, Journal of Material Processing Technology 191 (2001) 260–264
[2]. Patrick J. Golden, “Development of a dovetail fretting fatigue fixture for turbine engine materials” Materials and Manufacturing
Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH 45433(2004), USA.
[3]. Yu Zheng, Chee-Meng Chew, “A geometric approach to automated fixture layout design”, National University of Singapore,
Singapore 117576, Singapore(2005).
[4]. F. Mervyn, A. Senthilkumar, S.H. Bok, A.Y.C. Nee, “Development of an Internet-enabled interactive fixture design system”, 10
Kent Ridge Crescent, Singapore.(2009)
[5]. K. Nagai, T. Yamaguchi, “Experiments on chaotic vibrations of a post-buckled beam with an axial elastic constraint”, Gunma 376-
8515, Japan.(2010)
[6]. Rong Y, Bai Y, J Manufacturing Science Engineering, “Automated generation of fixture configuration design” Trans ASME 1997;
119(2):208–19.
[7]. K.C. Aw, W.D.J. Huang, M.W.R.P. De Silva, “Evaluation of climatic vibration testing on plastic waterproof enclosure for
electronic equipment using ANSYS workbench”,(2011) The University of Auckland, 20, Symonds Street, Auckland, New Zealand.

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Modeling and Analysis of Clamp for Brake Spider Fixture by Fem Using Ansys Software

  • 1. International Journal of Engineering Inventions e-ISSN: 2278-7461, p-ISSN: 2319-6491 Volume 2, Issue 11 (July 2013) PP: 21-24 www.ijeijournal.com Page | 21 Modeling and Analysis of Clamp for Brake Spider Fixture by Fem Using Ansys Software Dr.Yadavalli Basavaraj1 , Pavan Kumar B. K.2 , Varun B. V.3 , Sumanth G.4 1 Professor & Head, Dept.of Mechanical Engineering. Ballari Institute of Technology and Management, Bellary. Karnataka. India 2 Asst. Professor, Dept. of Mechanical Engineering. Ballari Institute of Technology and Management, Bellary. Karnataka. India 3, 4 Student, Dept. of Mechanical Engineering. Ballari Institute of Technology and Management, Bellary, Karnataka, India Abstract: A fixture is designed and built to hold, support and locate every component to ensure that each is drilled or machined with accuracy and manufactured individually. A brake spider includes a spider body with a central opening and a slot for receiving a camshaft and bracket assembly. The brake spider is attached to axle housing via the central opening. The form to be used depends on the shape and requirement of the work piece to be machined. In the existing fixture, used for modeling brake spider component, only five components were machined per hour. In the present work, detailed study of brake spider component is carried out and design is modified to increase the productivity. The new fixture design is carried out by using CATIA V5 modeling software and it is critically evaluated for the failure of clamp component, by finite element method (FEM) using ANSYS software. This modified design is adapted in the fabrication of fixture and is tested for its productivity. It is found that there is a considerable enhancement in the productivity to seven components per hour with required accuracy. Key Words: Fixture; clamp; ansys; brake spider; CATIA V5; FEM I. Introduction Over the past century, manufacturing has made considerable progress. New machine tools, high- performance cutting tools, and modern manufacturing processes enable today's industries to make parts faster and better than ever before. Although work holding methods have also advanced considerably, the basic principles of clamping and locating are still the same. The fixtures must satisfy the conditions like reduction of ideal time, cleanliness, provision for coolant. II. Literature survey A brief review of contemporary research supporting this paper is presented below. The study of Dr. Yu Zheng presents a method for finding form-closure locations with enhanced immobilization capability. Fixtures are used in many manufacturing processes to hold objects. Fixture layout design is to arrange fixturing elements on the object surface such that the object can be held in form-closure and totally immobilized. In contrast to concentration of six axis nano positioning method Dr.Patrick J. Golden tested a unique dovetail fretting fatigue fixture was designed and evaluated for testing turbine engine materials at room or elevated temperatures. Initial test results revealed interesting variability in the behavior of the nickel based super alloy specimens at elevated temperature. K.C. Aw paper concentrates on electronic equipment used for maritime application. Simulation using ANSYS workbench software was performed to comprehend the effect of various parameters of accelerated testing performed on these waterproof enclosures. Experiments were performed to examine the correlation with simulation results. The above mentioned strategy was applied to reduce the buckling in a part of fixture design assembly. But our main objective of the project is to increase the productivity with required accuracy. III. Objectives  As design of the fixture for the component cannot happen in isolation, the objective of the project also extends to the aspects like the features of the vertical machining center.  Process planning, cycle time estimation and designing of the fixture for the brake spider component is carried out.  Critical component of the fixture would be analyzed from stress and deflection view.
  • 2. Modeling And Analysis Of Clamp For Brake Spider Fixture By Fem Using Ansys Software www.ijeijournal.com Page | 22 IV. Fixture design Fixture planning is to conceptualize a basic fixture configuration through analyzing all the available information regarding the material and geometry of the work piece, operations required, processing equipment for the operations and the operator.  Method of locating.  Design the clamping method.  Design any supports required.  Design the base required.  Design the fixture body. 4.1 Cycle time estimation The design of fixtures should be such that the process of loading and unloading the components takes the minimum possible time and enables on easy loading. Table 1: Cycle time estimation Total cycle time 6.40 minutes Load and unload time 2 minutes Total time 8.40 minutes No. of components / hour 7.142 numbers Hence, the production rate of brake spider component is seven components per hour. V. Brake spider component A brake spider includes a spider body with a central opening and a slot for receiving a camshaft and bracket assembly. The brake spider is attached to axle housing via the central opening. The slot is defined by an inner surface that does not completely surround the camshaft. Fig 1: 3D front view and side view model of brake spider component VI. Assembly of brake spider fixture Fig 2 : 3D Isometric view model of assembly of brake spider fixture design  Study of the brake spider component and the existing fixture in use.  Study of the process planning: Estimation of the process for achieving the final dimensions of the components, selection of tools, tool holders, insert grades, cutting parameters and arriving at the cycle time of the component. Clamp
  • 3. Modeling And Analysis Of Clamp For Brake Spider Fixture By Fem Using Ansys Software www.ijeijournal.com Page | 23  Fixturing concept: As per the fixture clamp dimensions the vertical machining center is selected and conceptualized design is done by arresting six degrees of freedom by resting, locating, orienting and clamping.  Detailed design: Assembly drawing of the brake spider fixture using CATIA V5 modeling software is carried out.  Analysis of critical components: Static deflection analysis of key element of fixture clamp using ANSYS software. VII. Static analysis of clamp The procedure for a static analysis consists of these tasks: 1. Set the analysis title 2. Preferences 3. Preprocessor  Element type  Real constant  Material properties  Model generation  Applying boundary conditions 4. Review of result The detailed steps in performing static deflection of base plate through finite element approach are as follows: a. Set the analysis title: “Static deflection of clamp” b. Preferences: Structural, Discipline: h method c. Preprocessor:  Element type: The elements chosen for the present work is SOLID-45.  Material properties: Modulus of elasticity of steel= 2 x 105 N/mm2 Poisson’s ratio = 0.3 Density = 7800 N/mm3 .  Model generation: The model is imported from CATIA V5 and the meshing has been carried out using Ansys-mesh tool.  Boundary conditions: Fig 3: Boundary conditions, stress distribution and static deflection applied on clamp A force of 6968N obtained from theoretical calculation is applied on the middle portion of clamp as shown in above Fig 3. The bottom face of the clamp is constrained to all degrees of freedom. VIII. Conclusions 1. In the current work, the following conclusion is outlined.  The fixture for brake spider component machining as per the customer requirements has been attempted successfully, in order to increase the productivity. 2. The static analysis of the clamp component of the designed fixture carried out by finite element method using ANSYS software is summarized as follows.  Maximum cutting force and maximum clamping force employed for the analysis are 6968N and 20904N respectively.
  • 4. Modeling And Analysis Of Clamp For Brake Spider Fixture By Fem Using Ansys Software www.ijeijournal.com Page | 24  Maximum static deflection of clamp part of the fixture is found to be 0.18 x 10-05 mm and maximum stress (Von mises) is found to be 1.72Mpa. These values are within specified limits which are shown in Fig References [1]. S. Ratchev , K. Phuah, S. Liu, “FEA-based methodology for the prediction of part– fixture behavior and its applications” School of M3, University of Nottingham, United Kingdom, Journal of Material Processing Technology 191 (2001) 260–264 [2]. Patrick J. Golden, “Development of a dovetail fretting fatigue fixture for turbine engine materials” Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH 45433(2004), USA. [3]. Yu Zheng, Chee-Meng Chew, “A geometric approach to automated fixture layout design”, National University of Singapore, Singapore 117576, Singapore(2005). [4]. F. Mervyn, A. Senthilkumar, S.H. Bok, A.Y.C. Nee, “Development of an Internet-enabled interactive fixture design system”, 10 Kent Ridge Crescent, Singapore.(2009) [5]. K. Nagai, T. Yamaguchi, “Experiments on chaotic vibrations of a post-buckled beam with an axial elastic constraint”, Gunma 376- 8515, Japan.(2010) [6]. Rong Y, Bai Y, J Manufacturing Science Engineering, “Automated generation of fixture configuration design” Trans ASME 1997; 119(2):208–19. [7]. K.C. Aw, W.D.J. Huang, M.W.R.P. De Silva, “Evaluation of climatic vibration testing on plastic waterproof enclosure for electronic equipment using ANSYS workbench”,(2011) The University of Auckland, 20, Symonds Street, Auckland, New Zealand.