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11-04-2018 K.S.R.M COLLEGE OF ENGINEERING, KADAPA (AUTONOMOUS) (  2017-2018) DESIGN, ANALYSIS AND DIE MANUFACTURING OF A CAM SHAFT BY K VENKATA SUMANTH C RAMANJANEYYA REDDYB MADHUSUDHANA REDDY G ASHOK C SREEHARI G MANI TEJA Under The Esteemed guidance of SRI T.V.V.S.N MURTHI Associate Professor, Mec. KSRMCE 1 Content:  Abstract  Engine Specifications  Design Calculation  Modelling  Analysis  DIE Preparation  Manufacturing  Conclusion 2 Abstract:  Camshaft and its associated parts control the opening & closing of engine valves, also responsible for ignition system. Generally driven by Crankshaft through timing gear.  In our project a camshaft is designed for PURUSHARTH PS 24/2 Multi cylinder stationary Diesel engine by using theoretical calculation.  A 3D model of Camshaft is created by using Unigraphics NX_10 and analysis done.  Core and Cavity is extracted for Camshaft prototype, CNC program is generated for both DIE.  Prototype is prepared in casing process. 3 Engine Specifications TYPELISTER DIESELENGINE ModelPS24/2Power HP/KW24/17.6Speed RPM1000Bore MM127Cubic capacityCC1850 X 2Stroke MM146.05Compression Ratio1:18Fuel Consumption(max)4720g/hr5.7 Lit/hrNet weight KG510 4 Design calculations: Cam design: Designing cam for PS 24/2 stationary engine Bore: 127mm stroke: 146.05mm  Diameter of cam shaft =0.16 X Bore X 12.7=0.16 X 127 X 12.7 =258.064mm  Base circle diameter of cam lobe =3 + camshaft dia + 20=3 + 258.064 + 20 =281.064mm  Width of cam lobe =(0.09 X bore) + 6 mm=(0.09 X 127) + 6 =29.22 mm   Taking angle between cam lobes =108 0 ( for narrow cam lobes) 5 Total fore acting on cam lobe: Consider d  P = 0435 X d = 0.435 X 127 = 55.245mmd  S = (d  P /8) + 6.35 = (55.245/8) + 6.35 = 13.255mmP max = 0.60505 MPa (for cam angle Ɵ=135 o ) = 0.60505 N/mm 2 We know that, t = K X d  P X √(P max / f  t ) = 0.44*55.245*√(0.60505/56) =0.44*55.245*0.10394=2.41181f  t =  .    (1 −      ) 56 =  .  .    (1 −  ∗ . ∗ .  )1  =1.456 ∗  2.41181  (0.159954)1  = 0.000752112 F = 1329.58N 6  11-04-2018 Modelling:  SIEMENS NX formally known as “UG-UNI GRAPHICS”  NX is an advance high-end CAD/CAM/CAE package since 2007 owned by SIEMENS PLM SOFTWARES.  NX is a direct competitor to CATIA, Creo, Autodesk Inventory and Solid works.  It is used among other tasks, for ã Design ã Engineering analysis ã Manufacturing 7 SIEMENS_NX key functions Computer aided design (CAD) (design) ã Parametric solid modelling(feature based and direct modelling) ã Freeform surface modelling for class A surfaces ã Reverse engineering ã Engineering drafting ã Sheet metal design ã Routing for electric wiring and mechanical piping and more… Computer aided engineering (CAE) (simulation) ã Stress analysis / finite element method(FEM) ã Kinematics ã CFD ã  Thermal analysis Computer aided manufacturing (CAM) (manufacturing) ã Numerical control (NC) programming 8 Advantages of NX over remaining packages ã Fast, Flexible and Efficient Product Design ã Manufacturing Module ã CNC Programming ã User Friendly Enrolment ã CAD/CAM/CAE package ã Dedicated Reverse engineering module (NX_CAM NASTRAN) 9 Design Procedure of Camshaft in NX  Step1: OpenNX!0asnewpartfileandgivefilenamewithpath  Step2: SelectCoordinatesystemafterclickingsketchoption  Step3: SketchCirclewithrespectivedimensionsthenExtrude 10  Step4: RepeatsameproceduretillCamshaftcompletes  Step5: makeKeyslotandedgebendoperationsoncamshaftforthesakeoffinishing  Step6: Savethefileas.IGESor.STPfileformat  Step7: Save.PRTfiletoeditdimensionsinfuture 1112

Apr 16, 2018

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