[ Pobierz całość w formacie PDF ]

radial depth of cut= 12 mm (slot milling).
Figure 10: Application example for dry roughing and dry finishing
3.5 Machining of plastic models
The design departments of the automotive industry have to develop new car models.
For their design studies they often use a ductile type of plastic moulding material,
called  Plastelin . After the first design step with the CAD-system they machine the
model true to the original on a milling machine tool or on a measuring machine with a
special milling drive. Therefore they use preferably a coated PM-HSS end mill with a
ball nose geometry and with big flutes and small rake angles. The coating is
TiCN/TiN.
8
Figure 11 shows the milling cutter and the application example. The range of cutting
data is: Rev.= 4.000 - 6.000 /min, cutting speed= 200 - 300 m/min, feed = 5.000 
10.000 mm/min, feed per tooth = 0,6  0,8 mm, axial depth of cut = 5  45 mm,
radial depth of cut = 5 mm. The milling cutter diameter was 16 mm in this case.
Figure 11: Machining a ductile type of plastic moulding material with a special PM-
HSS end mill
9 [ Pobierz całość w formacie PDF ]