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Sheet 3 - mkdcll
Course: fliud mechanics (2222222)
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University: جامعة كفر الشيخ
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Kafr-Elsheikh University - Third year, Second term
Faculty of Engineering - Theory of Machining
Mechanical Eng. Dept. - Sheet No 3
1- What are the two principal aspects of cutting-tool technology?
2- Name the three modes of tool failure in machining
3- In addition to cutting speed, what other cutting variables are included in the expanded
version of the Taylor tool life equation?
4-What are some of the tool life criteria used in production machining operations?
5-Identify three desirable properties of a cutting-tool material.
6-What is the difference in ingredients between steel cutting grades and nonsteel-cutting
grades of cemented carbides?
7- Flank wear data were collected in a series of turning tests using a coated carbide tool on
hardened alloy steel at a feed of 0.30 mm/rev and a depth of 4.0 mm. At a speed of 125
m/min, flank wear = 0.12 mm at 1 min, 0.27 mm at 5 min, 0.45 mm at 11 min, 0.58 mm at
15 min,0.73 at 20 min, and 0.97 mm at 25 min. At a speed of 165 m/min, flank wear = 0.22
mm at 1 min,0.47 mm at 5 min, 0.70 mm at 9 min, 0.80 mm at 11 min, and 0.99 mm at 13 min.
The last valuein each case is when final tool failure occurred. (a) On a single piece of linear
graph paper, plot flank wear as a function of time for both speeds. Using 0.75 mm of flank
wear as the criterion of tool failure, determine the tool lives for the two cutting speeds.
(b) On a piece of natural log-log paper, plot your results determined in the previous part.
From the plot, determine the values ofn and C in the Taylor Tool Life Equation.
(c) As a comparison, calculate the values of n and C in the Taylor equation solving
simultaneous equations.Are the resulting n and C values the same?
8-A series of turning tests were conducted using a cemented carbide tool, and flank wear data were
collected. The feed was 0.010 in/rev and the depth was 0.125 in. At a speed of 350 ft/min, flank wear
= 0.005 in at 1 min, 0.008 in at 5 min, 0.012 in at 11 min, 0.0.015 in at 15 min, 0.021 in at 20 min, and
0.040 in at 25 min. At a speed of 450 ft/min, flank wear = 0.007 in at 1 min, 0.017 in at 5 min, 0.027 in
at 9 min, 0.033 in at 11 min, and 0.040 in at 13 min. The last value in each case is when final tool
failure occurred. (a) On a single piece of linear graph paper, plot flank wear as a function of time.
Using 0.020 in of flank wear as the criterion of tool failure, determine the tool lives for the two cutting
speeds. (b) On a piece of natural log–log paper, plot your results determined in the previous part.
From the plot, determine the values of n and C in the Taylor Tool Life Equation. (c) As a comparison,
calculate the values of n and C in the Taylor equation solving simultaneous equations. Are the
resulting n and C values the same
