Page 640 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Section 23.2 The Turning Process 62|

TABLE 23.3

Summary ct Turning Parameters and Formulas

N Rotational speed of the workpiece, rpm
f Feed, mm/rev
U Feed rate, or linear speed of the tool along workpiece length, mm/min
-/‘N
V Surface speed of workpiece, m/min
#DON (for maximum speed)
rrDaVgN (for average speed)
I Length of cut, mm
DO Original diameter of workpiece, mm
Df Final diameter of workpiece, mm
Dawg Average diameter of workpiece, mm
(DO + Df)/2
a' Depth of cut, mm
(DO + Dy)/2
t Cutting time, s or min
I/fN
MRR mm3/min
7rDa.,gdfN
Torque N - m
FCDavg/2
Power kW or hp
(Torque)(w), where to = 27TN rad/min

Note: The units given are those which are commonly used; however, appropriate units must be used and
checked in the formulas.

900
factors involved in the cutting process, forces Ft and F, Cubic boron nitride,
diamond, and
are difficult to calculate directly; they usually are de-
600 ceramics
termined experimentally if desired.
A
.E
Roughing and Finishing Cuts. In machining, the usual E
E 300 Cermets
procedure is to first perform one or more mug/wing cuts
Coated
at high feed rates and large depths of cut (and therefore carbides
high material~removal rates), but with little considera-
tion for dimensional tolerance and surface roughness. 150
These cuts are then followed by a finishing cut, at a
lower feed and depth of cut in order to produce a good 100
surface finish.

Tool Materials, Feeds, and Cutting Speeds. The
general characteristics of cutting-tool materials have 50
0.10 0.20 0.30 0.50 0.75
been described in Chapter 22. A broad range of appli- Feed (mm/rev)
cable cutting speeds and feeds for these tool materials
is given in Fig. 23.6 as a general guideline in turning
operations. Specific recommendations regarding turn-
ing-process parameters for various workpiece materi-
als and cutting tools are given in Table 23.4.

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