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The production capacity installed corresponds to more than 12.000
tons per year of skived and roller burnished / honed tubes.
All the equipment have been designed and built by Stelmi, taking a
great advantage of a 25 years long production experience.
Stelmi equipment machines the tube horizontally; the tube turns and
the tool translates, carried at one end of the boring bar. Rotation
and translation may be varied continuously. Machining the tube
horizontally means an easier control of the tube itself from both
sides and an easier positioning for long tubes. The machining
operation is fully automated.
PROCESS EVALUATION
Compared with honing, skiving and roller burnishing process offers
not only a better accuracy but also a better surface quality.
A comparison between standard production samples is shown
hereafter; skived and roller burnished material has a lower Ra and
Rz and a better bearing factor. The picture displays a 60% Tpi
achieved, by honing, at a depth of 1,39 ?m The same Tpi value can
be found at a depth of only 0,17 ?m thanks to the skiving and
roller burnishing process. The shown differences are very important
for the gaskets life; for honed tubes, after 100 working hours the
gaskets are already 50% worn out. This is due to the fact that the
gaskets operate like a "tool",
working to smooth the small, sharp peaks resulting from the honing
operation. This phenomenon is unknown for skived and roller
burnished tubes.The superior surface quality offered by the skived
and roller burnished tubes is essential when a cylinder operates at
high speed. The skived and roller burnished surface is superior
also for
very slow displacements, avoiding the "stick-slip" phenomena. Honed
surfaces on the opposite require frequent gaskets maintenanaces.
WT (inch)/ OD (inch) | 0.109 | 0.156 | 0.188 | 0.219 | 0.250 | 0.313 | 0.375 | 0.406 | 0.438 | 0.500 | 0.563 | 0.625 | 0.750 | 1.000 |
0.500 | ||||||||||||||
0.563 | ||||||||||||||
0.625 | ||||||||||||||
0.750 | ||||||||||||||
0.875 | ||||||||||||||
1.000 | ||||||||||||||
1.500 | ||||||||||||||
1.750 | ||||||||||||||
2.000 | ||||||||||||||
2.500 | ||||||||||||||
3.000 | ||||||||||||||
4.000 | ||||||||||||||
5.000 | ||||||||||||||
6.000 | ||||||||||||||
7.000 | ||||||||||||||
8.000 |