Page 677 - Manufacturing Engineering and Technology - Kalpakjian, Serope : Schmid, Steven R.

658 Chapter 23 Machining Processes: Turning and Hole Making

|]23.39. A 150-mm-diameter aluminum cylinder 250 mm 23.4l. Assume that you are an instructor covering the top-
in length is to have its diameter reduced to 115 mm. Using the ics described in this chapter and you are giving a quiz on the
typical machining conditions given in Table 23.4, estimate numerical aspects to test the understanding of the students.
the machining time if a TiN-coated carbide tool is used. Prepare two quantitative problems and supply the answers.
n23.40. For the data in Problem 23.39, calculate the
power required.

SYNTHESIS, DESIGN, AND PROJECTS

23.42. Would you consider the machining processes de- Internet regarding these fixtures, and comment on their
scribed in this chapter as net-shape processes, thus requiring design and operation.
no further processing? Near-net-shape processing? Explain 23.46. Review Fig. 23.7d, and explain if it would be possible
with appropriate examples. to machine eccentric shafts, such as that shown in Fig. 23.12c,
23.43. Would it be difficult to use the machining processes on the setup illustrated. What if the part is long compared
described in this chapter on various soft nonmetallic or rub- with its cross section? Explain.
berlike materials? Explain your thoughts, commenting on the 23.47. Boring bars can be designed with internal damping
role of the physical and mechanical properties of such materi- capabilities to reduce or eliminate vibration and chatter dur-
als with respect to the machining operation and any difficul- ing machining (see Fig. 23.17). Referring to the technical lit-
ties that may be encountered in producing the desired shapes erature, describe details of designs for such boring bars.
and dimensional accuracies.
23.48. Make a comprehensive table of the process capabili-
23.44. If a bolt breaks in a hole, it typically is removed by ties of the machining operations described in this chapter.
first drilling a hole in the bolt shank and then using a special Using several columns, describe the machine tools involved,
tool to remove the bolt. Inspect such a tool and explain how type of cutting tools and tool materials used, shapes of parts
it functions. produced, typical maximum and minimum sizes, surface fin-
23.45. An important trend in machining operations is the ish, dimensional tolerances, and production rates.
increased use of flexible fixtures. Conduct a search on the