DESIGN AND ANALYSIS OF INDEXING TYPE DRILL JIG FOR A MISSSILE COMPONENT
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1 International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 11, November 2017, pp , Article ID: IJMET_08_11_090 Available online at ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed DESIGN AND ANALYSIS OF INDEXING TYPE DRILL JIG FOR A MISSSILE COMPONENT S R V Narsaiah.S, L.Radhakrishna Department of Mechanical Engineering, S R Engineering College, Warangal, India Lakshmipathi Yerra Department of Mechanical Engineering, MLR Institute of Technology, Hyderabad, India Prasanna V Department of Mechanical Engineering, Kakatiya Institute of Technology, Warangal, India ABSTRACT The main objective of this project is to design an Indexing Type of Drill Jig for a missile component by understanding the design concept, modeling it and to perform the analysis by which the design is validated. The component design was studied in detail and then the drill jig was designed, and tested and was found to produce components of acceptable quality. The design of each component of jig was carried out and the designs of all components are included in this thesis. The evaluation technique generally involves the implementation of CAD software that helps for designing drafting, assembly and analysis which may be useful for customized applications and manipulations. Keywords: Aluminum alloy, Drill jig, indexing, Cylindrical Shells. Cite this Article: S R V Narsaiah.S, Lakshmipathi Yerra, Prasanna V and L.Radhakrishna, Design and Analysis of Indexing Type Drill Jig for a Misssile Component, International Journal of Mechanical Engineering and Technology 8(11), 2017, pp INTRODUCTION Mass production aims at high productivity to reduce unit cost and Interchangeability to facilitate easy assembly. This necessitates production devices to increase the rate of manufacture and inspection device to speed-up inspection procedure. Jigs are special purpose tools which are used to facilitate production like machining, assembling and inspection operations. The mass production of work-piece is base on the concept of interchangeability according to which every part produced within an established tolerance. Jigs provide a means of manufacturing interchangeable parts since they establish a relation with predetermined tolerances, between the work and the cutting tool. Once the jig is editor@iaeme.com
2 Design and Analysis of Indexing Type Drill Jig for a Misssile Component properly set up, any number of duplicate parts may be readily produced without additional set up To increase production in drilling and milling process for cylindrical part, it is a challenge to hold with an angle. This chapter discussed about project background to design jigs for holding cylindrical part and the important to use jig in production. 1.1 Problem Statement Holding cylindrical parts to be drilled is one of major problems faced by the manufacturing company, especially small medium company. Sometimes they need expensive equipment to holds the parts to be drill. Today, customers request in industries is increasing. So, the company must find new method to improve their productivity. 2. DESIGN OF DRILL JIG 2.1. Design Procedure Of Indexing Type Of Drill Jig: In this design of indexing type of Drill Jig for a casted component can be explained in a systematic procedure. Initially the component was designed, modeled and edited to get the necessary details for designer of the jig. Secondly the individual parts such as Base plate, Locator, Clamping Devices, Bushes, Jig plate and Indexing mechanism has been developed. All these parts have been Designed, Modeled, Drafting has been done individually. The whole Design procedure was completed with the help of CAD software(pro-e) by which the software helps for Designing, Drafting, Assembly, and Analysis done by ANSYS software and manipulations Component Details The component for which the Jig is designed is a casted component which is having angular hole inclined at 25degrees equi-shaped. The particulars of the component can be stated as follows Component: Casted component Material: Al Alloy (LM20) Operation performed: 1. Boring. 2. Facing. 3. Drilling. APPLICATION: These types of components are used in missile applications where propulsion of gases takes place and the gases are released through Four Holes. The design done with the help of AUTO CAD where the component is studied, designed, modeled and drafting is done editor@iaeme.com
3 S R V Narsaiah.S, Lakshmipathi Yerra, Prasanna V and L.Radhakrishna Figure 1 Component Aluminium Casting Alloy (AL - Si12Cu) 2.3. Designing of Drill Jig Components Design of base plate The base plate designed here is also a casted component in which some cavities are provided to reduce the material cost. According to the dimensions of the component the base plate is designed and modeled and it satisfies all the parameters to support the other parts. Figure 2 Base Model Figure 3 Locator Model Design of locator A large portion of the tool designer`s time spent in the solution of locating and clamping problems. The type of locator used in this design is locator for circular surfaces in which the inner diameter is taken as the locating surface of the component. The surface clamping and other mechanisms are developed Design of clamping device While performing a manufacturing operation it is necessary to provide some kind of CLAMPING mechanism to hold the work piece in the desired position and to resist the effects of gravity and operational forces. The function of any clamping devices is that of applying and maintaining sufficient counteracting and holding forces to a work piece to withstand all tooling forces editor@iaeme.com
4 Design and Analysis of Indexing Type Drill Jig for a Misssile Component Proper clamp design based up on simplicity utility. This affects the total tool cost and product cost and permits optimum production, surface finish, and tool life. Clamp selection is based up on the analysis of the work piece. Clamp design considerations should include its location. Figure 4 Strap Clamp Arrangement Design of bushes Bushings are used to guide drills, reamers, and other cutting tools into proper position on the work piece. These are made of tool steel and are hardened to RC60 to 64 to provide a wear resisting surface. The length of bushing is quite important and it is approximately equal to twice the diameter of the bushing Hole Indexing Type Drill Jig Assembly From this assembly clearly observed that the drill axis consider with the hole axis hence the design is satisfied for hole positioning in which the hole are inclined at 25degrees with base. In the design of drill jig the most vital part is locator pin, because it is very much important that how the relationship is maintained hence for this a locator pin is used. Hence the concept of fool proof design is also satisfied, it means that any unskilled operator can easily operate the jig since the component is arrested in the desired position and there is no other chance for any positional errors. Figure 5 Drill Jig Assembly isometric View Figure 6 Assembly of Drill Jig Top View editor@iaeme.com
5 S R V Narsaiah.S, Lakshmipathi Yerra, Prasanna V and L.Radhakrishna 3. CLAMPING FORCE 3.1. Calculation of Drilling Forces One of the primary objectives for the design of Indexing type of drill Jig is the calculation for the drilling forces. The various calculation involved in the design process are explained in the following While drilling the drill is subjected to the action of the cutting forces, which can be continently resolved in to three components a tangential component Fz, a radial component Fy and an axial component Fx, which is commonly referred to as thrust force in drilling. The extrusion torque at the chisel edge is negligible and the torque acting in the drill is mainly constituted by the Tangential force Fz. The radial component Fy on both lips usually cancel out and are taken care of by the rigidity of the work piece and the drill. Various empirical formulae exist for the calculation of the axial force F, and the torque. But because of the uncertain conditions of the chisel edge and other more suitable factors, there is considerable variation in the computed values. The following equation by Shaw and Oxford can be used for the computation of the Torque and Thrust. Drilling Thrust The axial thrust F (N) can be estimated with the following formula: F k x k x f x d 2 k c : specific cutting force (N mm 2 ), which depends primarily on the material being machined. f: feed per rotation (mm) d: tool diameter (mm) and k: The coefficient depends on the geometry of the tip of the tool we can consider an average value of 0.5. From The Standard Tables, k c = 1050N/mm 2 f = 0.4mm d = 24mm k = 0.5 Thrust Force =2520N 0.5 x 1050 x 0.4 x 24 F 2 Drilling Torque Example: drilling with a monobloc carbide spiral drill Drilling torque is expressed as: M k x f x d editor@iaeme.com
6 Design and Analysis of Indexing Type Drill Jig for a Misssile Component M c : drilling torque in m N k c : specific cutting force in N mm 2 f: feed per rotation in mm d: tool diameter in mm Torque=30.24N-mm Cutting Parameters M.4 x 24 2 The cutting parameters, and therefore the operating parameters of a drill for drilling operations are: d:tool and hole diameter (mm) v c : cutting speed (m min 1 ) which gives the rotational speed of the tool (rev min 1 ) f: feed per rotation in mm rev 1 N=Spindle Speed in RPM N 1000 x v xd v π.d v c =105.5 rev min 1 The resulting performance parameter is: *v f : feed rate in mm min 1 v f = f N =0.4x1440 v f =576 mm min 1 The feed rate is one of the main factors of productivity, as it conditions chip-to-chip Time t = p / v f. p: hole depth Time=20/576 = min. t =2.08sec. Power of Cut Drilling with a Monobloc carbide spiral drill Cutting power is expressed as: editor@iaeme.com
7 S R V Narsaiah.S, Lakshmipathi Yerra, Prasanna V and L.Radhakrishna P c : cutting power in kw k c : specific cutting force (N mm 2 ) f: feed per rotation (mm) d: tool diameter (mm) v c : cutting speed (m min 1 ) Cutting Power=4.431KW P P k x f x v x 0.4 x 24 x Strap Clamp Design For our case we are selecting a bolt of M8 size Width of clamp W=2.3 x d Where d is the diameter of the bolt selectors W=2.3 x (8) =19.17 W=20 mm Thicknesses of clamp for bolt dia. d is given as T= [0.85dA (1-(A/B))] Where d is the diameter of the bolt A is the distance between pivot & bolt=40 B is the span, pivot to work piece =60 W is the width clamp T is the thickness of clamp T=0.85x8x40x (1-(40/60)) T= mm Width of the slot C = d C = =9.57 C = 10mm 3.3. Clamping Forces Stud size CLAMPING FORCE OF STANDARD CLAMP STRAPS Recommended torque N-M Clamping force KN Tensile force in stud KN M M M M M M M editor@iaeme.com
8 Design and Analysis of Indexing Type Drill Jig for a Misssile Component Figure 7 Clamping Arrangement The clamping force generated can be calculated from the following equation: P B A x F Where, P = output force (clamping force acting on the part) F = input force (applied force or effort) B = input distance (from fulcrum to input force application location A = output distance (from fulcrum to output force application location 1. For maximum use of leverage, the support or fulcrum should be placed as close as possible to the work piece. F F = N 2. The required torque to produce the needed input force is T=0.2 x 24 x Torque= NM This is in fact equal to T = k x d x F, where k is torque coefficient. k is written in terms of coefficient of friction as k = 1.33μ, but sometimes it is considered as: k = 0.2 for unlubricated case k = 0.15 for lubricated case (greased) 4. RESULTS AND DISCUSSION The Thrust force is 2520N The clamping force is N The analysis i.e. Maximum equivalent stress obtained is Mpa, Maximum deflection obtained is mm, editor@iaeme.com
9 S R V Narsaiah.S, Lakshmipathi Yerra, Prasanna V and L.Radhakrishna 4.1. Drill Jig Fixed Support and structural force Representation 4.2. Total Deformation Representation & Equivalent Stress Representation 5. CONCLUSIONS The design of Indexing type of drill jig for BDL involved about 308x312mm dimensions. The clamping force is more than the drilling force (calculated) The analysis i.e. Maximum equivalent stress obtained is Mpa, maximum permissible limit is 450 Mpa, and the values are within the elastic limit, hence the design is safe. Maximum deflection obtained is mm, so, it is within the elastic limit hence it can be concluded that the structure designed is safe and it can withstand the maximum Cutting forces developed during machining. The assembly of the Indexing type of Drill Jig is found satisfactory. The results obtained after drilling like bore, surface finish. etc. are found to be within the limit as specified by the customer. The design of the Indexing type of Drill Jig was verified and approved by BDL Hyderabad. REFERENCES [1] M. Donoldson.C and Others, Tool Design, Tata McGraw Hill, 1978 [2] Kempster, Introduction to Tool Design and Jigs and Fixtures, ELBS [3] ASTME, Hand book of Fixture design editor@iaeme.com
10 Design and Analysis of Indexing Type Drill Jig for a Misssile Component [4] Korsakov, Fundamental of Fixture Design, MIR Publication, Moscow [5] Goroshkin.A.K., Jigs and Fixtures Handbook, MIR Publication [6] Colvin, F. H.; Haas, L. L. Jigs and Fixtures: A Reference Book. New York and London: McGraw-Hill Book Company. [7] NBV Lakshmi Kumari, G.Prsasnna Kumar, Design and Analysis of Indexing Type of Drill Jig, IOSR Journal of Mechanical and Civil Engineering (IOSRJMCE) e-issn: ,p-ISSN: X, Volume 12, Issue 2 Ver. I (Mar - Apr. 2015) [8] P H Joshi, Jigs and fixtures Tata McGraw-Hill Education, 2010 [9] P. Stephen Antony Predeep, S. Sivason raja, C.Rammurugan, R.Senthil Kumar, Optimizing the Method of Work Holding Device- Drill Jig with Adjustable Drill Bush, IJIRSET, and ISSN (Online): , ISSN (Print): ,Vol. 4, Special Issue 6, and May [10] Bralla, J. G, Design for manufacturability handbook. New York: McGraw-Hill, pg ISBN [11] Akash Thammannagowda, Venkatesh H and Santhosh Kumar T C, Design and Fabrication of Drill JIG for the Component "Aileron Lever Frame 6 Upper" for "Hawk Mk-132" An Advanced Jet Trainer. International Journal of Mechanical Engineering and Technology, 8(4), 2017, pp [12] Ragip Hadri and Ali Muriqi, Aluminum Alloys and Behavior under Cyclic Loading in Joints of Truss Structures, International Journal of Civil Engineering and Technology, 8(11), 2017, pp [13] Ranjith. R, Giridharan. P. K and Senthil Kumar. B, Predicting The Tensile Strength of Friction Stir Welded Dissimilar Aluminum Alloy Using Ann, International Journal of Civil Engineering and Technology, 8(9), 2017, pp editor@iaeme.com
DESIGN AND FABRICATION OF DRILL JIG FOR THE COMPONENT ''AILERON LEVER FRAME 6 UPPER'' FOR ''HAWK MK-132'' AN ADVANCED JET TRAINER
International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 4, April 2017, pp. 372 379, Article ID: IJMET_08_04_039 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=8&itype=4
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