Page 203 - Mechanical Engineer's Data Handbook

MANUFACTURING TECHNOLOGY 191

5.6.7 Carbide and ceramic tools

Carbides are graded according to series (see table) and
by a number from 01 (hardest) to 50 (toughest), e.g.
Po1 and K40.

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Series Material machined Carbides
P Steel, steel castings W, Ta, Tt, Ni with Co binder
M Cast iron, non-ferrous, plastic W with Co binder
K Heat resistant steels, stainless steels W with Co binder

SI&ered carbide tools - eollrdiriolllil ud poeitive rake

Cutting speed (mmin-') Top rake (")

Clean Rough scaly
Material being cut Rough Fine metal metal

Steel:
Low-medium carbon 75 120-210 8 0-4
Medium-high carbon 60 90-180 4 0-3
Nickel chrome 30 75-120 0.4 0
Cast iron:
200 Brinell hardness 45-60 90-120 3.5-8
White heart 3-6 6-4 0
Copper 150-240 240-360 13-16
Brass 120-240 240-360 0-3.5
Bronze and gun metal 120-180 240-300 0-3.5
Aluminium alloy 90-150 180-225 13-16
Plastics 120-180 240-300 0
Glass 9-15 15-21 3.5

Ceramic tools (sinted ahminiurn oxide witb grain
nlslersulbio&r)
Material being cut Cutting speed (m min- ')

Cast iron 60-610
Steel w50
Aluminium >610