Page 655 - Manufacturing Engineering and Technology - Kalpakjian, Serope : Schmid, Steven R.

Milling
Snaggmg (coarse grmdmg)

P'a"‘“Q’S“aP‘“Q
/.tm 50
Hot rolling
Chapter 23 Machining Processes: Turning and Hole Making
The ratings given in Table 23.8 are relative, and there can be significant varia-
Forging
tions in special applications. For example, heat-treated, high-carbon, cast-steel rolls
for rolling mills can be machined on special lathes using cermet tools at material-
removal rates as high as 6000 cm3/min. Also called high-removal-rate machining,
this process has at least two important requirements: (a) very high machine tool
Turning, boring
rigidity to avoid chatter and associated tool breakage and (b) high power of up to
450 kW

Bf°a°*““Q
Roughness (Ra)
Process 7 7 0.40 0.20 0.10 0.05 0.025 0.012
0.8
6.3
“ea"“"9
25
1.6
3.2
12.5
Rough cutting ~ 7 _ Average aPPI'Ca'f'0f1
Investment casting 7
Flame cutting
7
E] Less frequent app||Cal|Ol'l
Chemical machining
~2
Sawing
Casting
Sand casting
Permanent mold casting
Die casting 7 7
72 g
Forming
Extruding
Finishing processes
Cold rolling, drawing 7 7
Holler burnishing
Machining

72 7

Drilling
Advanced machining

Electrical-discharge machining
Electron-beam machining
7 7
Laser machining 7i
Electrochemical machining 7 7

Honing 111
Barrel finishing
Electrochemical grinding 777777
Grinding 7 7
Electropollshing 7
Polishing 7 7
Lapping
Superfinishing

FIGURE 23.l3 The range of surface roughnesses obtained in various processes. Note the
Wide range Within each group, especially in turning and boring.