Flanged Coupling

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It is a slide like thesis paper submitted on flanged coupling. It is from Khulna University of Engineering & Technology, Bangladesh.

Transcript of Flanged Coupling

  • 1. Design & Construction of a Flanged CouplingA report submitted to the department of Mechanical Engineering , Khulna Universityof Enfineering & Technology in partial fulfillment of the requirements for theSupervised by:-Engr. Md. Rasedul Islam,Lecturer,Khulna University of Engineering &Technology.Submitted by:-Al AmanRoll No.: 1105032Ashraful Alam ShipluRoll No.: 1105033Tausif Rafid AhmedRoll No.: 1105034Md. Habib Ullah KhanRoll No.: 1105035Md. Asiful IslamRoll No.: 1105036Course of ME-3118September-2014Department of Mechanical EngineeringKhulna University of Engineering & TechnologyKhulna-9203,Bangladesh

2. Thanks to almighty Allah for enabling and helping the authors to carry out thisproject work.The authors would like express deep and sincere gratitude to their supervisorMd. Rasedul Islam, Lecturer,Department of Mechanical Engineering, KUET,for his consultion and discussion which were essential to carry out this work. Hisperpetual energy and enthusiasm in research had motivated the authors throughhis advices a lot. In addition, he was always accessible and willing to help themto carry out this project.They want to express their sincere gratitude to Prof. Dr. Mohammad ArifulIslam, Head, Department of Mechanical Engineering, KUET, who gave thempermission to work in machine shop, welding shop and heat engine laboratory.Also thanks to all the lab assistants who helped the authors in order to achievethe project goal.AuthorsACKNOWLEDGEMENTI 3. ABSTRACTA rigid coupling is a unit of hardware used to join two shafts within a motor ormechanical system. It may be used to connect two separate systems, such as a motor anda generator, or to repair a connection within a single system. A rigid coupling may alsobe added between shafts to reduce shock and wear at the point where the shafts meet.Flanged coupling is a type of rigid coupling in which two co-linear shafts are connectedby the flanges. The coupling enables torque transmission between the shafts & preventsrelative rotation between them.In the project work a flanged coupling was made by local material available & theanalysis of various stresses & safety factor was also performed.The outcome of analysis is theres no danger of failure by pure shear, even if a fatiguestrength reduction factor is included, but this same section may have severe &undefinable bending stresses on it if the flanges are imperfectly aligned, and they surelywill be. The bolts bending was neglected since they were too small compared to theresult outcome.Finally, the computed factor of safety of the flanges suggest that it would withstandrepeated bending if the misalignment is small.II 4. TABLE OF CONTENTSPageAcknowledgement IAbstract IITable of Contents IIIList of Figures VList of Tables VINomenclature VIICHAPTER-1: INTRODUCTION1.1 Introduction 11.2 Objectives 3CHAPTER-2: LITERATURE REVIEW2.1 Historical Background 42.2 Safety Factor 42.3 Importance of Safety Factor 52.4 Shear stress & Compression Stress 52.5 Unit of Safety Factor 62.6 Units of Stress 62.7 Description 72.8 Function 72.9 Advantages & Disadvantages 82.10 Drawbacks 8CHAPTER-3: DESIGN3.1 Introduction 93.2 Problem 103.3 Solution 113.4 Dimensions 133.5 Solidwork Design & Keyshot Renderings 143.6 Material 153.7 Key Feature of the Design 153.8 Selection 15IIICHAPTER-4: CONSTRUCTION4.1 Machines & Apparatus Required 164.2 Machining Processes 164.3 Methodology 184.4 Final Project 18 5. IVCHAPTER-5: CONCLUSION5.1 Result & Discussion 195.2 Conclusion 19REFERENCES 20 6. LIST OF FIGURESFigure Title PageFigure 1.1 Muff Coupling 1Figure 1.2 Types of misalignments in shafts 2Figure 1.3 A typical flange coupling 2Figure 1.4 Application of Flanged Coupling 2Figure 2.1 Single Shear 5Figure 2.2 Double Shear 6Figure 2.3 Compressive stress 6Figure 2.4 Key 7Figure 2.5 Keyway & Keyseat in flange & shaft 7Figure 3.1 Dimension Reference 10Figure 3.2 Flange 1 (Male Part) Dimension in (mm) 13Figure 3.3 Flange 2 (Female Part) Dimension in (mm) 13Figure 3.4 Solidwork Design of Flanged Coupling 14Figure 3.5 Facing 16Figure 3.6 Turning 17Figure 3.7 Boring 17Figure 3.8 Chamfering 17Figure 3.9 Drilling 18Figure 3.10 Final Project 18V 7. LIST OF TABLESTable Title PageTable 2.1 Advantages & Disadvantages of Flanged Coupling 8VI 8. NOMENCLATURESymbol DescriptionN Design FactorF ForceA Resisting Area StressSd Design StressSy Yeild StressD DiameterH HeightL LengthT TorqueSys Yeild StresssSs Shearing StressVII 9. CHAPTER 1 INTRODUCTION OBJECTIVES 10. 1.1 INTRODUCTION:A coupling is a device used to connect two shafts together at their ends for the purposeof transmitting power. Couplings do not normally allow disconnection of shafts duringoperation, however there are torque limiting couplings which can slip or disconnectwhen some torque limit is exceeded.The primary purpose of couplings is to join two pieces of rotating equipment whilepermitting some degree of misalignment or end movement or both. By careful selection,installation and maintenance of couplings, substantial savings can be made in reducedmaintenance costs and downtime.Couplings are used to connect two shafts for torque transmission in varied applications.It may be to connect two units such as a motor and a generator or it may be to form along line shaft by connecting shafts of standard lengths say 6-8m by couplings.Coupling may be rigid or they may provide flexibility and compensate formisalignment. They may also reduce shock loading and vibration. A wide variety ofcommercial shaft couplings are available ranging from a simple keyed coupling to onewhich requires a complex design procedure using gears or fluid drives etc.However there are two main types of couplings:a. Rigid couplingsb. Flexible couplingsa) Rigid CouplingRigid Couplings are mainly used in areas where the two shafts are coaxial to each other.There are many types of couplings that fall under the rigid couplings category. They areRigid Sleeve or Muff Couplings-This is the basic type of coupling. This consists of a pipe whose bore is finished to therequired tolerance based on the shaft size. Based on the usage of the coupling a keywayin made in the bore in order to transmit the torque by means of the key. Two threadedholes are provided in order to lock the coupling in position. The photo shows a type ofthe rigid sleeve or muff coupling.Fig. 1.1 : Muff couplingb) Flexible CouplingFlexible couplings are used to transmit torque from one shaft to another when the twoshafts are slightly misaligned. Flexible couplings can accommodate varying degreesof misalignment up to 3 and some parallel misalignment. In addition, they can alsobe used for vibration damping or noise reduction. The material used to manufacturethe beam coupling also affects its performance and suitability for specific applicationssuch as food, medical and aerospace. Materials are typically aluminum alloy andstainless steel, but they can also be made in acetal, maraging steeland titanium. Themost common applications are attaching encoders to shafts and motion controlfor robotics.Page-1 11. Fig.1.2 Types of misalignments in shaftsFlange CouplingIt is a very widely used rigid coupling and consists of two flanges keyed tothe shafts and bolted.Fig. 1.3 A typical flange couplingPage-2Application:1. Designed for heavy load & industrialequipment.2. In various machines.3. Can be used in a driveshaft of a car or truck.( A drive shaft, driveshaft, driving shaft,propeller shaft (prop shaft), or Cardan shaftis a mechanical component for transmittingtorque and rotation )Fig. 1.4: Application of FlangedCoupling 12. 1.2 OBJECTIVES:I. To solve a problemII. To design that problemIII. To calculate factor of safetyIV. To know about couplings functionV. To know about its applicationPage-3 13. CHAPTER 2 HISTORICAL BACKGROUND SAFETY FACTOR IMPORTANCE OF SAFETY FACTOR SHEAR STRESS & COMPRESSION STRESS UNIT OF SAFETY FACTOR UNIT OF STRESS DESCRIPTION FUNCTION ADVANTAGES & DISADVANTAGES DRAWBACKS 14. 2.1 Historical Background:In 1545, Italian mathematician Girolamo Cardano theorized that the principal ofgimbals could be used to transmit rotary motion through an angled connection, whichwas developed into the Cardan Shaft, which was said to deliver a smoother ride, alongwith being more efficient and less prone to breakdowns because the shaft was alwaysat a 90 degree angle to the axle. This new concept was actually first seen in 1548 onthe carriage of the Holy Roman Emperor Charles the 5th.Then in 1676, Robert Hooke revisited Cardanos idea and used it to make aninstrument that would allow for a safer way to study the sun. This new instrument useda new type of joint that allowed for twisting motion in one shaft to be passed on toanother, no matter how the two shafts were oriented. It would take another 240 yearsfor Clarence W. Spicer to come along and apply this idea to the automotive andindustrial industries. Spicer received a patent for the universal joint in 1903 anddemonstrated his new patent in a self-designed car, which did not have a troublesomechain & sprocket nor did it have chain and geared adaptions. Spicer would then beginmanufacturing in 1904.Human invented the transformation of energy. Soon they learnt to transfer it usingshaft. But in many cases they were unable to transfer power by shafts due tomisalignment, length of the shaft & its bending property. So they tried hard & inventedthe way of transmitting power by shafts in all possible situations. The mechanical jointthey invented was named coupling.2.2 Safety Factor- Design Factor:Factor of safety (FoS) or safety factor (SF) is ordinarily a number obtained that isdivided into a criterion of strength in order to obtain a design criterion. In the literalmeaning of this words, factor of safety would indicate by what factor the design issafe, but as actually used this is not true. Since its meaning does no