Hyd-Mech DM8, Руководство по эксплуатации и обслуживанию

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MEP S.p.A.
10--2 Use and maintenance manual DM 8
PROBLEM PROBABLE CAUSE SOLUTION
Rapid tooth wear
' Teeth pointing in the wrong direction . Set teeth in correct direction
'
Blade worn in wrongly
.
With a new blade cutting should be
done at half--speed and with down-
stroke speed also at half normal
speed. After the blade has been
worn in (about 300 cm
2
of work for
hard cutting materials and about
1000 cm
2
for soft cutting materials)
the cutting and downstroke speeds
can be brought up to rated levels
' Material too hard . Check cutting speed, downstroke
speed and blade pressure, as well
as type of band saw being used.
' Material defective . Surface defects: oxides, sand, sur-
face hardening.
Hardened inclusions in section.
Reduce cutting and downstroke
speeds or clean surface.
' Cutting speed too high . The teeth slide on the material with-
out cutting: reduce cutting speed
' Head downstroke speed too slow . The band saw runs over the material
without removing it: increase down-
stroke speed
' Insufficient coolant . Check coolant level and clean pipes
and jets.
'
Incorrect fluid concentration
.
Check and use the correct con-
centration.
'
New blade inserted into a partially--
made cut
.
The cutting surface might have been
subject to a localised heat--induced
alteration, making it harder: recom-
mence cut using a slower cutting
and downstroke speed. There may
be a broken tooth from the old blade
lodged in the cut: check and remove
before recommencing work
' Flutter . Blade tension too low: tighten .
Tooth shape or pitch unacceptable:
change type of blade used.
Widia blade steady buttons too far
from the blade back: adjust guide
heads, rotating them slightly to bring
them closer to the blade back.