3 608 878 300 Tightening Technology | Bosch Rexroth AG 65/641
System 350 | 3 608 878 300/2019-03
4.1.5 Tightening processes
A bolted connection should be designed in a way that the minimum mounting clamp force reached
guarantees the function of the bolted connection, but the maximum mounting clamp force does not
destroy the bolted connection or the bolt.
The following tightening processes are available for this:
• Angle of turn-controlled tightening process
• Torque-controlled tightening process
• Yield-point controlled tightening process
• Special tightening processes, e. g. loosening/retightening sequences.
4.2 Tightening system design
This chapter describes the criteria for designing a tightening system.
4.2.1 Tightening spindle
Assembly note If a tightening spindle is installed horizontally, an additional support of the tightening spindle (e. g. near
the gearbox) is recommended.
4.2.1.1 Size
The torque necessary for the bolted connection determines the size of the tightening spindle.
Example
Requirements for the tightening spindle:
– 5 tightening spindles
– Torque:
Pre-tightening with 200 Nm, synchronous final tightening of all tightening positions to 180° (approx. 400 Nm)
– Center-to-center distance: 200 mm
– Tightening depth: approx. 50 mm
– Tool mount: 3/4'' square
– Measurement of torque and angle of turn as close as possible to the bolt (no gearbox between measurement
transducer and bolt)
CAUTION
Risk of injury
If tightening processes with higher torques are implemented with a hand-held tightening spindle, the
forces may result in injuries, particularly at the joints.
Please use a torque support.
Example
In the product catalog, the example represents a tightening spindle size 5: Working range 50-500 Nm
– Straight output drive GK3C281 (short output drive with sufficient range of spring)
– Measurement transducer 5DMC530 (if necessary, also with redundant measurement transducer)
– Planetary gearbox 5GE68
–EC motor EC305
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