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Hitachi WR8DH Manual

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Torsión de apriete
Torsión de apriete
Torsión de apriete
Tiempo de apriete: seg
(
Grosor de la plancha
de
acero t = 25 mm)
Fig. 14
Tiempo de apriete: seg
(
Grosor de la plancha
de
acero t = 10 mm)
Fig. 13
Tiempo de apriete: seg
(
Grosor de la plancha
de
acero t = 10 mm)
Fig. 12
0
0123
200
400
600
800
1000
1200
kg–cm
M12 × 45
0
0123
200
400
600
800
1000
kg–cm
M10 × 30
0
0123
200
400
600
800
1000
kg–cm
M8 × 30
Perno de gran resis-
tencia a la tracción
Perno ordinario
Perno ordinario
Perno de gran resis-
tencia a la tracción
Perno ordinario
Fig. 15
* Se emplean los pernos siguientes
Perno ordinario: Divisón de dureza 4,8
Perno de gran resistencia a la tracción: División
de dureza 12,9
Tuerca
Grosor de la plancha
de acero t
Perno
Explicación de la clasificación de la resistencia:
4 — Punto de relajamiento del perno: 32 kgf/mm
2
8 — Resistencia a la tracción del perno: 40 kgf/
mm
2
)(
a
0 20 40 60 80 100 120
0
400
800
1200
Kg-cm
Número de aprietes (piezas/carga)
Fig. 16
M14 × 50 Perno de gran resistencia (Tiempo de apriete 3 seg.)
Torsión de apriete
3. Tensiónde apriete apropiada para los pernos y tuercas
La tensión de apriete óptima para pernos y tuercas
difiere según su material y tamaño.
Una tensión de apriete excesiva para un perno
pequeño podría deformarlo o romperlo. La tensión
de apriete aumenta proporcionalmente al teimpo de
operación.
Utilice la indicación de la escala y el tiempo de
operación adecuados a cada perno.
4. Sufeción de la herramienta
Subjetar firmemente el aprietatuercas neumático de
percusión con ambas manos, sujetando el asa del
cuerpo y el asa lateral, y ponerlo en línea con el
perno.
No es necesario presionar el aprietatuercas
excesivamente. Sufetar el aprietatuercas con una
tuerza equivalente a la fuerza de apriete.
Con la baterfa
completamente cargada
Con la baterfa
completamente cargada
Perno de gran resis-
tencia a la tracción
… 51 …


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