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1) Spænding
Når batteripakningen er næsten
udtjent, mindskes spændingen, hvilket
bevirker, at stramningsmomentet
falder.
Forhold ved stramning af bolte
0,50,0 1,0 1,5 2,0 3,02,5
M6
M12
M8
M10
50
100
150
Stramningsmoment
Stramningstid (sek.)
M8, M10 x 35 mm. M12 x 45 mm
Bolt med stor trækstyrke
(Boltstørrelse: Millimeter)
N·m
(k
g
f-cm)
0,50,0 1,0 1,5 2,0 3,02,5
M6
M12
M14
M8
M10
50
100
150
Stramningsmoment
Stramningstid (sek.)
M10 x 35 mm. M12, M14, M16 x 45 mm
Standardbolt
N·m
(k
g
f-cm)
Bolt
Møtrik
Skive
Stålplade,
tykkelse 10 mm
Skive
Fjederskive
Stramningsbetingelser
De følgende bolte anvendes.
Standardbolte: Styrketype 4,8
Type med stor trækstyrke 12,9
4,8
Forklaring af styrketype
Bolttrækgrænse
(80% af trækstyrke)
32 kgf/mm
2
(45000 psi)
Bolttrækstyrke
40 kgf/mm
2
(56000 psi)
2) Stramningstid
Længere stramningstid resulterer i
et jere stramningsmoment. Over-
dreven stramning er imidlertid ikke
tjenligt og forkorter værktøjets levetid.
3) Forskellig boltdiameter
Størrelsen af boltdiameteren påvirker
stramningsmomentet.
Almindeligvis stiger stramningsmo-
mentet, når boltdiameteren bliver
større.
4) Stramningsbetingelser
Stramningsmomentet vil være forskel-
ligt, selv med den samme bolt, alt efter
klassifikation, længde og momentkoef-
ficient (den faste koefficient angives af
fabrikanten ved fremstillingen).
Stramningsmomentet vil være forskel-
ligt, selv med det samme boltningsma-
teriale (dvs. stål), alt efter overfladebe-
skaffenheden.
Momentet reduceres drastisk, r bol-
ten og møtrikken begynder at rotere
sammen.
5) Borepatrons spillerum
Drejningsmomentet mindskes, så
snart en sekskant-konfiguration af en
borepatron med forkert størrelse anv-
endes til at stramme en bolt.
6) Omskifter (Kontroludløser for variabel
hastighed)
Momentet sænkes, hvis maskinen
anvendes, uden at afbryderen er tryk
-
ket helt ned.
7) Virkning af tilslutningsadapteren
Stramningsmomentet vil blive minds
-
ket via anvendelse af et universalled
eller en tilslutningsadapter.
91


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