0 sheet and answer material removal prof.alaa el-hakim ahmedawad(2)
DESCRIPTION
Metal Removal!)A St37 bar 050x250 mm2 is machined between centres on a lathe clown to 040 mm in a single pass using a HSS tool ae = 45°, a cutting speed of 50 m/min and a feed of 0.3 mrn/rev. Determine the depth of cut, the width of cut, the iced rate and the machining time. What should be the width of the cutting edge (b2) In drilling a through hole 015 mm in a St50 sheet 20 mm thick, using a HSS twist drill 1 i 8° point angle, the cutting speed is 30 m/min and the need is 0.2 mm/ rev% Determine the machining time.3) A steel plate 200xi 10x30 mm3 is to be reduced in thickness down to 15 mm on a shaper having a ratio v/vr=0.5 using a HSS tool with a plan approach angle ae= 45°,b, =12 mm, a cutting speed of lJLm/min and a feed of-0.3 mm/St. Determine the depth of cut, the number of passes and hence calculate the machining time.4) A HSS peripheral milling cutter 050x63 mm2, Z = 8 teeth is used for plain milling of a C.I. block 100x56x52. mm3 down to a thickness of 30 mm in roughing and finishing passes, using a cutting speed of 20 m/min and a feed of 0.2 mm/tooth in roughing and a cutting speed of 30 m/min and a Iced of 0.05 mm/tooth in finishing. Determine the depth of cut in each case and the total machining Ome.5) A facing operation is carried out on a St60 workpiece 0100x75 mm2 clamped in a three jaw chuck to adjust its length to 70 mm on a lathe, using a bent shank carbide tool with se = 45°, a cutting speed of 1 50 m/min, a seed of 0.2 mm/rev and a depth oi cut of i mm. Determine the lota! required machining time.6) A twist drill 020 mm is used for enlarging a previously drilled blind hole 015x30 mm2, in a St50 block 40 mm thick, using a cutting speed of 30 m/min and a teed of 0.2 mm/rev. Determine the depth of cut and calculate the machining lime.7) A carbide tipped face milling cutter 063 mm (Z=8, ar-=45°, b,= 10 mm) is used for machining the same workpiece of question (4) under the following cutting conditions: For roughing: v ~- 60 m/min, sz = 0.20 mm/toothFor finishing: v = 80 m/min, sz =0.05 mm/tooth Determine the total machining time.TRANSCRIPT
