Siemens SINUMERIK 840D sl Operating Manual page 364

Programming technological functions (cycles)
8.2 Milling
● Edge finishing
● Chamfering
Vortex milling
Particularly where hardened materials are concerned, this process is used for roughing and
contour machining using coated VHM milling cutters.
Vortex milling is the preferred technique for HSC roughing, as it ensures that the tool is
never completely inserted. This means that the set overlap is precisely maintained.
Plunge cutting
Plunge cutting is the preferred method of machining slots for "unstable" machines and
workpiece geometries. This method generally only exerts forces along the tool axis, i.e.
perpendicular to the surface of the pocket/slot to be machined (with the XY plane in Z
direction). Therefore, the tool is subject to virtually no deformation. As a result of the axial
loading of the tool, there is hardly any danger of vibration occurring for unstable workpieces.
The cutting depth can be considerably increased. The plunge cutter, as it is known, ensures
a longer service life due to less vibration for long overhangs.
Approach/retraction for vortex milling
1. The tool approaches the starting point in front of the slot in rapid traverse and maintains
2. The tool goes to the cutting depth.
3. The open slot is always machined along its entire length using the selected machining
4. The tool retracts to the safety clearance in rapid traverse.
Approach/retraction for plunge cutting
1. The tool moves in rapid traverse to the starting point in front of the slot at the safety
2. The open slot is always machined along its entire length using the selected machining
3. The tool retracts to the safety clearance in rapid traverse.
364
the safety clearance.
method.
clearance.
method.
Operating Manual, 03/2013, 6FC5398-7CP40-3BA1
Milling