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1.
International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – INTERNATIONAL JOURNAL OF MECHANICAL ENGINEERING 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME AND TECHNOLOGY (IJMET) ISSN 0976 – 6340 (Print) ISSN 0976 – 6359 (Online) Volume 4, Issue 6, November - December (2013), pp. 241-248 © IAEME: www.iaeme.com/ijmet.asp Journal Impact Factor (2013): 5.7731 (Calculated by GISI) www.jifactor.com IJMET ©IAEME APPLICATION OF TRANSIENT THERMAL ANALYSIS FOR THREE FEEDER DESIGN OPTIMIZATION FOR SAND CASTING Haider Hussain1, Dr. A.I. Khandwawala2 1 2 (Research Scholar, Bhagwant University Ajmer (Rj.), India) (Ex. Professor, Mechanical Engineering Department, SGSITS, Indore, India) ABSTRACT In the present scenario most focus is on defect free casting. In achieving this task computer simulation is playing a key role. In sand casting, solidification related defects can be find out by computer simulation on FEM based software very closely. One of the major solidification related defect is shrinkage porosity. This defect may occur at the last freezing point of casting in its thickest section. Feeders are required to remove shrinkage porosity from casting. Feeders are not the required part of casting so it has to be removed after casting process. These removed feeders have been put in furnace for reuse of metal again and it increases production cost. Feeders designs are required to be optimized. In this work with the help of computer simulation on Ansys, hot spots have been identified and three feeders have been designed and optimization procedure has been developed for three feeders successfully. Three feeder optimization result from Ansys have been compared with traditional modulus approach. Ansys optimizer is producing better results for this three feeder casting. Keywords: Feeder Design Optimization, FEM, Modulus Approach, Sand Casting, Shrinkage Porosity. I. INTRODUCTION Sand casting is the most widely used process for both ferrous and non – ferrous metals, and accounts for approximately 90% of all castings produced [1]. In sand casting, sand mixed with binders and water is compacted around wood or metal pattern halves to produce a mould. The mould is removed from the pattern, assembled with cores and metal is poured in to the resultant cavities. After cooling, moulds are broken to remove the casting. After casting is removed from the sand moulds, sand mould is destroyed [2]. 241
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International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME In sand casting, molten liquid metal is poured into a cavity which takes the negative shape of the object and the mould is made from sands. Heat removal is by heat transfer in sand mould, the governing equations for heat transfer are [3] డ் డ௧ =ߙ డమ ் (1) డమ ௫ Tሺ0 ,ݔሻ ൌ ܶ (2) Tሺ0, ݐሻ ൌ ܶெ (Temperature at metal end) (3) Tሺ∞, ݐሻ ൌ ܶ (4) Finite Element Method (FEM) is a powerful computational tool that is used to numerically solve many engineering problems. Most of the Research on the area of casting processes modeling uses FEM as a solver to the casting Process model. The numerical simulation of solidification process using either Finite Difference or Finite Element Methods (FDM/FEM) involves the following steps: [1] 1. Formulating an accurate mathematical model of the solidification process. 2. Specifying accurate values for thermal properties of material involved. 3. Performing the analysis to obtain the temperature history of casting and mould points. 4. Post – processing the results to visualize the solidification pattern and identify defects. Feeders are designed to compensate the solidification shrinkage of a casting, and make it free of shrinkage porosity. Feeder design parameters include the number, location, shape and dimensions of feeder. Feed path and feeding distance influence the location and number of feeders. The volume of the feeders must be minimized to increase the yield. The criterion is given by for getting feeder yield ܥிଷ: ܥிଷ=ܰ ݒ /൫ܰ ݒ ∑ ݒ ൯ (5) Finite element analysis based software Ansys 12.0 has been used. Modal of casting is done in Pro E wild fire and cylindrical feeders have been created in Ansys modeling. Element selection and material property feeding is done latter. Convective load have been considered after proper meshing. Proper boundary values of temperature have been provided and then transient thermal analyses have been performed. DB log file has been assigned to Ansys optimizer and then design variable, state variable and objective functions have been provided [5]. They are height of feeder, maximum temperature difference of feeder and respective casting zone, inverse of feeder yield respectively with suitable allowances and factor of safety. First order optimization has been performed through Ansys 12.0. In FEM, the field variables are the temperatures at all nodal points that vary with time .Thermal properties like thermal conductivity, density, specific heat also vary with temperature and hence the problem becomes non – linear transient in nature Galerkin’s weighted residual approach has been reported[7]. The advantage of using FEM is the ability to handle complex boundaries, the ease in implementing boundary condition. But this method requires much effort for formulation of problem, data preparation and need long processing time [8]. In general, FEM is preferred as it allows a wider choice of element shapes and better accuracy, while FDM based simulation programs are faster and easier to execute. Recent advances 242
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International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME have been in the areas of automatic preprocessing (mesh generation), adaptive remeshing for better accuracy in critical regions, heat transfer models for considering the effect of variable air gap and mould coatings, convective and radiation heat transfer and improving the efficiency of computation[9]. Feeder optimization has been performed using topology optimization [10], poison equation approximation [11] and genetic algorithm [12]. P. Prabhakara Rao gives advantages of computer simulation based design enumerated. The procedures thus described have been demonstrated with the above case study of application of Pro CAST simulation at G.S alloy Foundry. It is demonstrated that the foundries can derive mileage by resorting to FEM simulations of the casting process for process development and optimization. [13] The application of casting simulation softwares in the foundries not only minimizes the wastages of resources required for final castings, but also improves / enhances the quality and yield of castings, which implies higher value addition and lower production cost. The experimental study represents the effect of sizes of risers and necks on the solidification behavior of the aluminum alloy castings. The simulated results are more or less similar with experimental results. [14] The application of computer aided method, solid modeling, and casting simulation technologies in foundries can able to minimize the bottlenecks and non value added time in casting development, as it reduces the number of trial casting required on the shop floor. In addition, the optimization of riser neck reduces or completely removes the occurrence of shrinkage defect in the casting. The application of casting simulation software based on finite element method and vector element method shows good results and matched with the experimental results.[15] II. DATA COLLECTION Multi feeder optimization has been performed on a dumbbell casting of Aluminium-06. Three feeders have been considered. Volume = 1.178 M^3, Surface Area = 8.9e-2 M^2 Feeders can be optimized by modulus approach. The thickest section has highest value of modulus [1]. The optimization can be performed on Ansys12. [5] III. FEEDER OPTIMIZATION The use of negative of the gradient vector as a direction for minimization was first made by Cauchy in 1847. In this method we start from initial trial point X1 and iteratively move towards the optimum point.[4] The method of steepest descent may appear to be the best unconstrained minimization technique since each one-dimensional search starts in the best direction. Design optimization works entirely with the ANSYS Parametric Design Language (APDL) and is contained within its own module (/OPT). Design optimization is largely concerned with controlling user-defined, APDL functions/parameters that are to be constrained or minimized using standard optimization methods (e.g., function minimization, gradients, design of experiments).The independent variables in an optimization analysis are the design variables. The vector of design variables is indicated by: [4] ܺ ൌ ሾܺଵ ܺଶ ܺଷ … ܺ ሿ (6) Design variables are subject to n constraints with upper and lower limits, that is, ܺ ܺ ܺ ሺ݅ ൌ 1,2,3, … , ݊ሻ Where: n = number of design variables. (7) 243
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International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME The design variable constraints are often referred to as side constraints and define what is commonly called feasible design space. Now, minimize ݂ ൌ ݂ሺܺሻ Where: (8) f = objective function ሺ݅ ൌ 1,2,3, … , ݉ଵ ሻ Subject to ݃ ሺܺሻ ݃ (9) ݄ ݄ ሺܺሻ ሺ݅ ൌ 1,2,3, … , ݉ଶ ሻ (10) ܹ ܹ ሺܺሻ ܹ ሺ݅ ൌ 1,2,3, … , ݉ଷ ሻ (11) g୧ ,h୧ ,W୧= state variables containing the design, with underbar and overbears representing lower and upper bounds respectively. (input as min, max on OPVAR command) m_1+m_2+m_3= number of state variables constraints with various upper and lower limit values. The state variables can also be referred to as dependent variables in that they vary with the vector x of design variables. [4] IV. OPTIMIZATION OF DUMBBELL CASTING WITH MODULUS APPROACH AND ANSYS For removing shrinkage porosity defect, three feeders are designed here by modulus approach and Ansys 10.0 design optimizer for dumbbell casting. Dumbbell has been considered in four sections A, B, C, D. First modulus approach has been used and then Ansys Optimizer applied. Modulus ApproachTable 1 Dumbbell casting data (Section wise) S Volume M ଷ Surface Area Modulus=V/A A 1.6 × 10ିଷ B 1.176×10ିହ C 1.25× 10ିସ D 1.765×10-5 10ି E 3.9×10-6 10ିସ F 1.56×10-5 G 3.9×10-6 M ିଶ 6× 10ଶ 6.13 × 10ିଷ 1.5 × 10ିଶ 6.126 × 10ିଷ 1.099×10-3 3.75×10-5 1.0995×10-3 Calculation for first feederDiameter of feeder = Dଵ , Height of Feeder = Hf1 Hf = 1.5 Dଵ, Volume of feeder = Vଵ Vf = 0.375 π Dଷ ଵ Area of feeder A= 1.75 π Dଶ ଵ 244 0.0267 ଵ 2.87 M 10ିଷ × 6.67× 10ିଷ 2.88 × 10ିଷ 3.547×10-3 0.416 3.55×10-3
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International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME Modulus of feeder Mf = భ భ Also Modulus of feeder = 0.214 Dଵ Modulus of feeder = 1.2 × modulus of region around Hot Spot. 0.214 Dଵ = Dଵ = 1.2 × 0.0267 M 149.7 MM Height of Feeder First = 223.5 MM Modified area of last freezing region= Surface area of hot spot region-area of feeder bottom = 6.02×10-2 - (π/4)×(0.1497)2 = 0.042399 M2 Modified modulus of last freezing point = 1.6×10-3/0.042399 = 0.037736 0.214×Dଵ = 1.2×0.037736 Dଵ = 0.212 M Dଵ = 212 MM Hଵ = 317 MM As above the height and diameter of feeder second and third has been find out and these values are as followsDଶ = 64.97 MM, Hଶ = 97.46 MM Dଷ = 26.3 MM, Hଷ = 39.47 MM Feeder Yield= Total Volume of Casting/ Total Volume of Casting + Total Volume of Feeders So feeder yield by Modulus method is = 13.36% The process of analysis of this case with Design optimizer of Ansys 12.0 (An FEM Based general purpose software) has been search out for three feeders. Here we have taken height of feeders as a design variables, State variable S1 = FT1-CT1 (always positive), State variable S2 = FT2-CT2 (always positive), State variable S3 = FT3-CT3 (always positive) with suitable allowances and factor of safety so that hot spot must not remain in casted part. It should be in respective feeder. FT= maximum feeder temperature for respective zone, CT= maximum casting temperature of catchment. Following are the graphs as a result of optimization. Figure1 is showing the temperature according to cooling. It can be seen that higher temperature are with feeders as compare to casing. This assures that the shrinkage porosity will be in feeders only. Fig. 1 is showing the temperature variation on the central plane of Casting and Feeders. 245
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International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME Figure 1: At centre plane of dumbbell shape casting with optimized feeders Figure:2: Difference of maximum feeder temperature with corresponding maximum temperature of casting zone Figure 3: Inverse of feeder yield during entire optimization process From figure 3, it is clear that the feeder yield is = 50.76 % 246
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International Journal of
Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME V. CONCLUSION Feeder yield comes out from modulus method = 13.36 % and Feeder yield comes out from feeder optimizer = 50.76 %. So net advantage gained by Ansys 12.0 design optimizer is = 36.90 %. Optimization on Ansys works better for small castings. Importing IGES file, Modeling, Meshing, in Ansys may produce problem for complicated shapes. After optimization of feeder design, the suggested value can be check by animation on the center plane and temperature contour can be plot at every time step. Three feeder design optimization can be perform on Ansys 12 which is low priced general purpose FEM based software. Ansys optimizer can produce better feeder design as compare to modulus approach for design of feeder but optimization process on Ansys requires more time and skill to work as compare to modulus method of feeder optimization but it giving accurate result. VI. ACKNOWLEDGEMENTS We are highly thankful for Bhagwant University and close friends & family members. REFERENCES [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] Ravi B., Metal Casting -computer aided design and analysis PHI, 2005. Jain R.K., Production Technology, Khanna Publishers, Delhi, 15th Edition Auguest, 1995. Qin Rongshan, Workshop: Heat management, Lecturer 7, Graduate Institute of Ferrous Technology, POSTECH computational metallurgy laboratory Korea, lecturer notes, seen on web in dec., 2008. Rao S.S., Optimization; Theory and Application, Wiley Eastern Limited, 1975. Ansys help - Thermal Tutorial, First order optimization, Ansys Inc. http://www.mece.ualberta.ca/Tutorials/ansys. Joshi Durgesh and Ravi B., comparison of finite element method and vector element method for casting solidification simulation, Indian Foundry Journal,22-23. vol. 54 no.9 September. 22-23, 2008, PP. 21-27. Venkatesan A., Rajadurai A., Effect of Air-Gap on Casting Solidification, American Foundary Society, 2006, PP.191-199. Ravi B. and Srinivasan M.N., casting solidification analysis by modulus vector method, International Journal of Cast Metals Res., 1996, PP.1-7. Tavakoli R. And Davami P., Optimal riser design in sand casting process with evolutionary topology optimization, Struct multidisc optim, accepted on 8 June 2008, DOI 10.1007/s00158-008-0282-z,Springer – Verlag, 2008, PP. 1-10. Tavakoli Rohalla and Davami Parviz , Optimal riser design in sand casting by topology optimization with SIMP method I : Poisson approximation of nonlinear heat transfer, equation, Struct multidisc optim , accepted on 29 October 2007, Springer – Verlag.2008, PP. 193-202. Elizabeth Jacob , Roschen Sasikumar , B. Praveen and V. Gopalakrishna , Intelligent design of feeders for castings by augmenting CAD with genetic algorithms, Journal of Intelligent Manufacturing , 15, 2004, PP.299-305. P. Prabhakara Rao, G.Chakraverthi, A.C.S. Kumar, G. Srinivasa Rao, Modeling and Simulation of Solidification in Alloy Steel Sand Castings, International Journal of Thermal Technologies, Vol.1, No.1 Dec. 2011, PP.121-127. T. Nandi, R. Behera, A. Chanda and G. Sutradhar, Study on Solidification Behaviour of LM6 Castings by Using Computer -Aided Simulation Software, Indian Foundry Journal, Vol. 57, No. 3, March 2011, PP.44-49. 247
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Mechanical Engineering and Technology (IJMET), ISSN 0976 – 6340(Print), ISSN 0976 – 6359(Online) Volume 4, Issue 6, November - December (2013) © IAEME [15] Behera Rabindra, Kayal.S, Sutradhar. G, Solidification behavior and detection of Hotspots in Aluminium Alloy castings: Computer Aided Analysis and experimental validation, International Journal of Applied Engineering Research, Dindigul, Volume 1, No 4, 2011, PP.715-726 . [16] Amol D. Sable and Dr. S. D. Deshmukh, “Characterization of Alsic Metal-Matrix by Stircasting”, International Journal of Advanced Research in Engineering & Technology (IJARET), Volume 3, Issue 2, 2012, pp. 226 - 234, ISSN Print: 0976-6480, ISSN Online: 0976-6499. [17] M.Narasimha, R.Rejikumar and K. Sridhar, “Statistical Methods to Optimize Process Parameters to Minimmize Casting Defects”, International Journal of Mechanical Engineering & Technology (IJMET), Volume 4, Issue 3, 2013, pp. 11 - 23, ISSN Print: 0976 – 6340, ISSN Online: 0976 – 6359. [18] Cherian Paul and Parvathy Venugopal, “Modelling of Interfacial Heat Transfer Coefficient and Experimental Verification for Gravity Die Casting of Aluminium Alloys”, International Journal of Mechanical Engineering & Technology (IJMET), Volume 1, Issue 1, 2010, pp. 253 - 274, ISSN Print: 0976 – 6340, ISSN Online: 0976 – 6359. 248
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