Question

Question 1 A turning operation is carried out on aluminum. Based on the specific energy values in Table 20.2, determine material removal rate and cutting power in the operation under the following sets of cutting conditions: (a) Cutting speed 5.6 m/s, feed 0.25 mm/rev, and depth of cut 2.0 mm; and (b) cutting speed- 1.3 m/s, feed 0.75 mm/rev, and depth 4.0 mm. Question 2 Consider a turning operation performed on steel whose hardness 225 HB at a cutting speed 3.0 m/s, feed 0.25 mm, and depth 4.0 mm. Using values of thermal specific energy value from Table 20.2, compute an estimate of cutting temperature. Assume ambient temperature 20°C I properties found in the tables and definitions of Section 4.1 and the (10) Question 3 A face milling operation removes 6.0 mm from the top surface of a rectangular piece of aluminum that is 250 mm long by 75 mm wide by 50 mm thick. Thickness after the cut 44.0 mm. The cutter follows a path that is centered over the workpiece. It has four teeth and an 85-mm diameter. Cutting speed- 2.0 m/s, and chip load 0.18 mm/tooth. Determine (a) machining time and (b) imum metal removal rate during cutting. max Question 4 The work part in a turning operation is 88 mm in diameter and 550 mm long. A feed of 0.30 mm/rev is used in the operation. If cutting speed 3.3 m/s, the tool must be changed every three work parts; but if cutting speed 2.2 m/s, the tool can be used to produce 14 parts between tool changes. Find the cutting speed that will allow one tool to be used for a batch size of 40 parts, which is the size of the next order for these parts (21) Question 5 Machinability ratings are to be determined for a new work material using the cutting speed for a specified tool life as the basis of comparison. For the base material (B1112 steel), test data resulted in Taylor equation parameter values of n 0.24 and C 450, where speed is m/min and tool life is min. For the new material, the parameter values were n 0.28 and C 490. Cemented carbide tools were used. Compute machinability ratings for the new material using as the tool life criterion (a) 60 min, (b) 10-min, and (c) 1.0 min. (d) What do the results show about the difficulties in machinability measurement?

Answer 1

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Powe Yeqinumnt can be caleaulat in turnin operation. Uang lhe following wMn ven, Fead ratt 2.0 mm Power = 07 x 5, 6x103 x 0.25 x 2.0 o Feed rat cut - 4.0 mm Power = o.yx, Powe 2730 watt