Proceedings of SerbiaTrib '13

considering thee spring force greater than inertiaforce corresponding to maximum deceleration, inorder to avoid the jump phenomenon.The parameter ξ is determined with the relation:ξ= (15-s)/b.The diagramm of friction forces versus cam angleis illustrated in Figure 9.In Figure 100 is inserted the diagram of the inputtorque with andd without friction.6.CONCLUSIONFigure 8. Constructed cam mechanism.Figure 9. Friction forces of cam mechanism withtranslatingflat-face followerFigure 10. Input torque with and without friction.In the designed and constructed mechanism(Figure 8) the data used in dynamic analysis are:μ=0.78, μ 0 =0.15, m=1 kg, k=3004 N/m, s 0 =13 mm,d= 50 mm and b=50 mm.1000k mThe damping coefficient is c 2ζ1000with ζ=0.1. The spring constant k is chosen274In this paper the optimization of f the designparameters of a cam mechanism with a flat-facedfollower is approached. For this taskthe multi-objective optimization with genetic algorithm isapplied using the high levell programming languageof MATLAB. The T optimization satisfies constraintsswhich are made in order to operate a cammechanism properly. This procedure is automatic,gives results fast and it appears to be reliable. r Thefinal results provide usefull informationn for a cammechanism synthesis and can be used as a basis offinal preference dependingg on the objectives thatthave to be succeeded.Subsequently,after the cam mechanismmsynthesis, the applied a friction forces arecalculated.Themost important conclusion is the fact that thefriction forces are a analogous with the action of thefollower movement. This means that inthe areas ofdwell the friction forces aresteady, whereas in theareas of rise or return the friction forces alter in analmost similar way. wREFERENCES[1][2][3][4][5][6]Chen Y. F., Mechanics and Design of CamMechanisms,Pergamon Press, USA, 1982.Norton R. ., Cam design and manufacturinghandbook, Industrial I Press, Inc., New York, 2002Bouzakis K. K D., Mitsi S., Tsiafis I., Computeraided optimum design and NC milling of planarcam mechanisms, International Journal of MachineTools and Manufacture, ,Vol. 37, No 8, pp 1131-1142, 1997. .Mitsi, S., Bouzakis, B K. -D., Tsiafis, J., Mansour,G.,Optimal synthesis of cam mechanism usingcubic spline interpolation for cam NC milling.Journal of the Balkan Tribological Association,Vol. 7, No 4, 4 2001, pp. 225-233.Tsiafis, I., Paraskevopoulou, R., Bouzakis, K.-D.,Selectionn of optimal design parameters for acam mechanism usingg multi-objective geneticalgorithm, Annals of the “Constantin Brancusi”University of TarguJiu, Engineering series, nr. 2,Romania, 2009, pp. 57- 66.Coley D., An A introductionon to genetic algorithms forscientists and engineers, World Scientific Press, 1999.13 th International Conference C onn Tribology – Serbiatrib’13