errata_Tlusty_text_updated_Sept_21_2007-1 - ERRATA, August...

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ERRATA, August 3, 1999. J. Tlusty, Manufacturing Processes and Equipment The following corrections are to be entered in the Problem sections of several chapters. The correct versions of the passages to be changed are put in brackets and underlined [ ]. P.6.3 . Flow through round channel. In a way analogous to Figs 6.11, 6.12, 6.13 write a Matlab computer program and produce plots of velocity distribution and of strain rate distribution for a) Newtonian fluid with viscosity 100 Pas at strain rate of 3,000/sec and b) Non-Newtonian fluid with viscosity characterized by parameters K =12,198 and n =0.4, see [ Eqs. (6.39), (6.40) and (6.47) ] for flow in a round channel with R =2mm, length L =50mm and pressure drop 3 = 30 MPa. Plot u and gammadot versus +- r. P.7.4 A milling operation is being performed similar to the one shown in Fig. 7.30. The feed/tooth c = 0.2 mm, [ ± = 30 o ] and the start and end angles are s φ = 30 ° , and e = 160 ° . a) Determine the [mean ] chip thickness [ h m ] . b) Indicate in a graph of h vs. , the variation of h on one tooth over two revolutions of the cutter. P.7.5 Graphically express the variation of torque in an end mill. In a graph of torque vs. angle , plot the torque of three subsequent teeth and find the maximum total torque on the end mill. The cutter has 8 straight teeth and a diameter of 100 mm. The workpiece engages the cutter from s = 45 ° to e = 150 ° , and the axial depth of cut a a = 20 mm.[ Chip load is c = 0.2 mm.] Assume a specific force of K s = 2000 N/mm 2 . P.7.6 A 4 fluted end mill of 40 mm diameter is performing an up-milling operation as shown in Fig. 7.29a), into a workpiece of 1035 steel. The axial depth of cut a a = 20 mm and the radial depth of cut a r = 25 mm. The cutting velocity v = 45 m/min, with a feed [per] tooth of [ c ] = 0.25 mm. Determine: a) Spindle speed n (rev/min). b) Feed rate f (mm/min). c) Metal removal rate Q (cm 3 /min). d) [ Mean ] chip thickness [ h m ] (mm). e) Specific power K s [W/(cm 3 / min)], from Table 7.1. f) Power P (kW).
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P.7.7 A face milling operation is being performed similar to that of Fig. 7.30. A 300 mm diameter cutter with 16 teeth is cutting a 200 mm wide strip of 1035 material, which is centrally located under the cutter axis.
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This note was uploaded on 09/06/2011 for the course EML 4321 taught by Professor Staff during the Spring '08 term at University of Florida.

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errata_Tlusty_text_updated_Sept_21_2007-1 - ERRATA, August...

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