Palmgren TU 2506, Руководство по эксплуатации

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Page 48
TU2506
ǀ
TU2807V US
4.16 Turning Speeds & Feeds
There are rules and principles of cutting speeds and RPM (revolutions per minute) calculations
that apply to all metal cutting operations. The operating speed for all metal cutting operations is
based on the cutting tool material and the hardness of the material to be cut. The hardness of
the work material has a great deal to do with the recommended cutting speed. The harder the
work material, the slower the cutting speed. The softer the work material, the faster the recom-
mended cutting speed Fig.4-18: „Recommended cutting speed“ auf Seite 48.
Fig.4-18: Recommended cutting speed
The hardness of the cutting tool material influences recommended cutting speed as well. The
harder the cutting tool material, the faster the cutting speed. The softer the cutting tool mate-
rial, the slower the recommended cutting speed Fig.4-19: „Recommended cutting speed“ auf
Seite 48.
Fig.4-19: Recommended cutting speed
The depth of the cut and the feed rate will also affect the cutting speed, but not to as great as
the workpiece hardness. These three factors, cutting speed, feed rate and depth of cut, are
known as cutting conditions. Cutting conditions are determined by the machinability rating.
Machinability is the comparing of materials on their ability to be machined. From machinability
ratings you can derive recommended cutting speeds. Recommended cutting speeds are given
in charts. These charts can be found in your Machinery's Handbook or in a chart given to you
by your tool salesperson. In Table 3 you will find a typical recommended cutting speed chart.
4.17 Recommended Cutting Speeds in Feet per Minute for Turning Ferrous and
Nonferrous Metals*
Steel Iron Aluminium Lead
Increasing Cutting Speed
Carbon Steel High Speed Steel Carbide
Increasing Cutting Speed
Material Condition
Hardness
HB
Cutting Speed, fpm
High-Speed
Steel
Carbide
Free Machining, Plain Carbon Steels
(Resulphurized)
AISI B1111, B1112, B1113,
1113, 1119, 1212, 1213
HR, A
CD
100 to 150
150 to 200 160
180 500
600
AISI 1108, 1115, 1118, 1120, 1126
HR, A
CD
100 to 150
150 to 200 140
150 450
500
AISI 1132, 1137, 1140, 1145, 1151
HR, A, N, CD
Q & T
Q & T
Q & T
175 to 225
275 to 325
325 to 375
375 to 425 130
90
50
30
500
250
175
140
Plain Carbon Steels
AISI 1012, 1015, 1018, 1019,
1020, 1022, 1024, 1025
HR, A, N, CD
HR, A, N, CD
HR, A, N, CD
CD
100 to 125
125 to 175
175 to 225
225 to 275 140
120
100
70
500
400
350
300