EXPERIMENTAL STUDY ON SHRINKAGE OF NARROW PARTS PRODUCED BY LASER CUTTING PROCESS

THE EFFECTS OF DIMENSIONS OF NARROW PARTS ON LENGTH SHRINKAGE WERE INVESTIGATED. BASED ON TAGUCHI APPROACH TO DESIGN OF EXPERIMENTS (DOE), AN EMPIRICAL MODEL WAS BUILD TO CALCUALTE THE SHRINKAGE OF X5CrNi18 -10 STAINLESS STEEL CUT BY CO 2 LASER USING N2 AS AN ASSIST GAS. THE EXPERIMENTAL DESIGN WAS PERFORMED ACCORDING TO TAGUCHI L16 ORTHOGONAL ARRAY WITH A MIXED LEVEL DESIGN FOR SHEET THICKNESS, NOMINAL SAMPLE LENGTH AND NOMINAL SAMPLE WIDTH. WITHIN THE LIMITS OF ANALISED VALUES, SHEET THICKNESS HAS NO SIGNIFICANT EFFECT ON SHRINKAGE AND THE HIGHEST EFFECT HAS THE NOMINAL SAMPLE LENGTH. THE RESULTS ARE INLINE WITH THE HYPOTHESIS THAT THE SHRIKAGE OCCURS DUE TO THE RESIDUAL STRESSES INDUCED IN RESOLIDIFIED LAYER. DERIVED EQUATIONS CAN BE USED TO PREDICT THE SHRINKAGE AND CONSEQUENTLY TO MODIFY THE CUTTING HEAD TRAJECTORY THAT LENGTH OF THE PART AGREES WITH THE NOMINAL VALUE.

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