DIN 844-NR / DIN 845-NR - Machining
parameters |
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Recommended machining parameters for the end mills center
cutting DIN 844 and DIN 845 NR type
(for roughing machining of N group materials), manufactured from SK8M (HSS-E)
steel |
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| Type of the machined material |
Vc.[m/min] |
Feed [mm/min] depended diameter of end mill [D] |
over Φ6
to Φ10 |
over Φ10 to Φ20 |
over Φ20 to Φ35 |
over Φ35 to Φ44 |
over Φ44
to Φ50 |
Alloy steel
Rm <=800 N/mm2 |
40 |
170 |
225 |
270 |
275 |
280 |
Alloy steelnarz.
Rm <= 1000 N/mm2 |
30 |
165 |
220 |
265 |
270 |
277 |
Alloy steel
Rm <= 1000 N/mm2 |
20 |
88 |
110 |
135 |
140 |
143 |
| Stainless and acid-resisting steel |
14 |
62 |
85 |
102 |
105 |
106 |
| Grey cast iron |
40 |
115 |
145 |
170 |
180 |
200 |
| Mlleable cast iron |
40 |
92 |
110 |
135 |
145 |
160 |
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Remarks:
- For the end mills manufactured from SW7M (HSS)
steel machining parameters should be increased by 25%
- The above parameters can be used for the model
machining conditions (plentiful cooling, right selected for particular
group coolant, stiffness of the machine tool, etc.)
- Feed values concern depth of machining 0,1D; for
other depths are obligatory below rule:
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| Depth of machining |
Feed |
| 0,25D |
100% of feed from Table 1 |
| 0,5D |
75% of feed from Table 1 |
| D |
50% of feed from Table 1 |
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- For the long variation feed value is reduced by next 50 %
- For the end mills 3 flutes (z=3) feed should be increased at
30% (f min x 1.3)
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