Design Of A Bolted Connection; Clamp Force And Distortion Of Connected Parts, Operating Forces - Bosch rexroth Nexo Manual

Bosch Rexroth AG | Tightening Technology
50/279
5.1

Design of a bolted connection

The planning of a tightening system starts with the definition of the tightenings that are to be implemented.
Basics on bolted connections and tightening technology can also be found in "Tightening Technology",
ISBN 3-478-93073-1, Moderne Industrie publishers.
5.1.1

Clamp force and distortion of connected parts, operating forces

F
F
M
Fig. 5–1:
F
f
F
M
f
SM
f
PM
f
SA
f
PA
F
S
F
A
F
KR
F
PA
F
SA
When a bolted connection is tightened, the mounting clamp force F
spring. The clamp force acts on the parts to be tightened (compression spring), pressing them together.
Normally, tightening stretches the bolt more than the parts are compressed.
During assembly, the mounting clamp force F
forces exerted, the parts to be tightened are pressed together (compressed) by f
If operating forces act on the bolted connection, the operating force F
clamp force F
duced by the amount f
force F
f
SM
Deformation diagram with acting operating force
Force
Distortion
Mounting clamp force
Elastic stretching of the bolt due to F
Elastic compression of the joined parts
Increase in elastic stretching of the bolt
Decrease in elastic compression of the joined parts
Total force (mounting clamp force and operating force)
Axial tightening force
Residual clamp force
Axial force, relief of the deformed parts
Operating force
. The bolt is additionally stretched by f
M
. The deformed parts are relieved by the axial force f
PA
acting on the parts remains.
KR
Nexo cordless Wi-Fi nutrunner | 3 608 870 A47/2019-10
f = f
SA PA
F
SA
F
A
F
PA
F
KR
f
PM
M
M
stretches the bolt by the amount f
M
while the compression on the material f
SA
3 608 870 A47
F
S
f
stretches the bolt like a tension
. Due to the tightening
SM
.
PM
superimposes the mounting
SA
is re-
PM
, but the residual clamp
PA