I. (SI units) Low-carbon steel with tensile strength-300 MPa, shear strength-220 MPa, and Brinell hardness of...

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I. (SI units) Low-carbon steel with tensile strength-300 MPa, shear strength-220 MPa, and Brinell hardness of 225 HB is turned at a cutting speed-2.5 m/s. Feed-0.20 mm/rev and depth of cut- 3.0 mm. Rake angle - 5° in the direction of chip flow. The resulting chip ratio 0.45. Using the orthogonal model to approximate turning, determine (a) cutting force, (b) feed force, and (c) compute the required power, if mechanical efficiency-80%. (30 points) (Hint: correction factor for the volume specific energy is: CF-KgtoKg-075 if to has units of Values of specific energy for selected work material using sharp cutting tools and chip thicknes before the cutting to = 0.25 mm Brinell hardness 150-200 201-250 251-300 Material Specifie energy U (N-m/mm) 1.6 2.2 2.8 Carbon steel

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Cuthi g Sbee d (v) 2-5 m/s 1.50 m/min Rake ngle o 5。 Shean ahgle - sula con plan 0.2× 3.0 Sin 2S As= 1.42mm 2 Shea oc iction angle. β- Sota-24-30+S-So ce -

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