Conditions de serrage des boulons

Conditions de serrage

• Les boulons suivants sont utilisés.

Couple de serrage

N·m (kgf-cm)

196,0

(2000)

147,0

(1500)

98,0

(1000)

49,0

(500)

M10×35 mm M12, M14, M16×45 mm Boulon standard

M16

M14

M12

M10

Boulon standard: Type de résistance 4,8

Type à haute résistance 12,9

Explication du type de résistance

4,8

Limite d’élasticité du boulon (80% de la résistance à la traction) 32 kgf/mm2 (45000 psi)

Limite d’élasticité du boulon 40 kgf/mm2 (56000 psi)

2) Temps de serrage

Un temps de serrage plus long entraîne

un couple de serrage plus élevé. Cepen-

dant, un serrage excessif n’ajoute pas de

valeur et réduit la longévité de l’outil.

0,0

0,5

1,0

1,5

2,0

2,5

3,0

 

 

Temps de serrage (s)

 

3) Différents diamètres de boulons

La taille du diamètre du boulon affecte le

couple de serrage.

Couple de serrage

N·m (kgf-cm)

196,0

(2000)

147,0

(1500)

98,0

(1000)

49,0

(500)

M8, M10×35 mm M12×45 mm Boulon haute résistance

M12

M10

M8

Généralement, lorsque le diamètre du

boulon augmente, le couple de serrage

augmente également.

4) Conditions de serrages

Le couple de serrage variera, même si l’on garde le même boulon, en fonction du degré, de la longueur et du coefficient de couple (le coefficient fixe indiqué par le fab- ricant à la production).

Le couple de serrage variera, même si l’on garde le même matériau à boulonner (ex: acier), en fonction de la finition de la sur- face.

Le couple est grandement réduit lorsque le boulon et l’écrou commencent à tourner

0,0

0,5

1,0

1,5

2,0

2,5

3,0

 

 

Temps de serrage (s)

 

BoulonRondelle

Tôle d’acier de 10 mm (3/8") d’épaisseur

Ecrou Rondelle Rondelle élastique

ensemble.

5)Jeu de douille

Le couple diminue lorsque la configuration à six côtés d’une douille de mauvaise taille est utilisée pour serrer un boulon.

6)Commutateur (Gâchette de contrôle de vitesse)

Le couple de serrage est diminué si l’appareil est utilisé lorsque le commuta- teur n’est pas complètement enfoncé.

7)Effet de l’utilisation d’un adaptateur de raccordement

Le couple de serrage diminue lorsque l’on utilise un joint universel ou un adaptateur de raccordement.

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Panasonic EY7541 Conditions de serrage des boulons, Conditions de serrage Les boulons suivants sont utilisés

EY7541 specifications

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