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31
Norsk
Stramningstid: sek.
(Stålplatetykkelse
t = 10mm)
Stramningstid: sek.
(Stålplatetykkelse
t = 25mm)
Fig. 20
Stramningstid: sek.
(Stålplatetykkelse
t = 25mm)
Stramningsmoment
Stramningsmoment
Stramningsmoment
M10 × 30
kgf
cm
2000
1500
1000
500
0
0
1
2
3
N
m
200
150
100
50
0
M12 × 45
kgf
cm
2000
1500
1000
500
0
0
1
2
3
N
m
200
150
100
50
0
M14 × 50
kgf
cm
2000
1500
1000
500
0
0
1
2
3
N
m
200
150
100
50
0
Bolt
*Følgende bolt brukes.
Ordinær bolt: Hardhetsdeling 4,8
Høyspenningsbolt: Hardhetsdeling 12,9
)(
Mutter Fig. 21
Stålplatetykkelse t
Forklaring på hardhetsdeling:
4 – Boltens flytegrense: 320 N/mm
2
{32,6 kgf/mm
2
}
8 – Boltens trekkstyrke: 400 N/mm
2
{40,8 kgf/mm
2
}
Stramningsmoment
Antall stramninger (PCS)/lading
Fig. 22
M16 × 55 F10T (stramningstid 3 sek)
Høyspentbolt
Ordinær bolt
Høyspentbolt
Ordinær bolt
Høyspentbolt
Ordinær bolt
300
250
200
150
100
50
0
0
a
20 40 60 80 100 120 140
3000
2500
2000
1500
1000
500
0
kgf•cm
N•m
Når helt oppladet
Når helt utlacet
(2) Driftstid
Stramningsmomentet øker med driftstiden. Men
stramningsmomentet vil ikke overstige en viss verdi
selv om verktøyet går over lang tid. (Se Fig. 20)
(3) Boltens diamenter
Stramningsmomentet varierer alt etter
boltdiameteren som vist i Fig. 20. Generellt vil en
bolt med større diameter ha større
stramningsmoment.
(4) Stramningsforhold
Stramningsmomentet varierer i forhold til
mementnivå, klasse og boltlengde selv om det
brukes bolter med ens gjengestørralse.
Stramningsmomentet varierer også avhengig av
hvordan overflaten på metallet, som bolten skal
skrus i, er. Hvis både bolt og mutte dreier rundt,
reduseres momentet betraktelig.
(5) Når tilleggsutstyr benyttes
Stramningsmomentet reduseres en tanke når
forlengelsesstang, universalskjøt eller en lang sokkel
brukes.
(6) Sokkelens forfatning
En utslitt eller deformert seks-eller firkantsokkel vil
ikke kunne passes tett nok inn i montasjen mellom
mutter og ambolt og stramningsmomentet blir derfor
for lite.
Hvis det benyttes en sokkel som ikke passer til
bolten blir stramningsmomentet utilstrekkelig. Sokler
og boltstørrelsersom passer sammen er vist i
Tabellene 1 og 2.
32


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