Rexroth Tightening System 350 System Documentation - Rhino ...

258/316 Bosch Rexroth AG | Tightening Technology 10 Working with the System10.1 Settings in the BS350The course of the graph looks somewhat as follows:T[Nm]T actT SA SA act A1 A 2A[°]Figure 10–5:Course of torque over angle of turnAngle of turn without spindle torsionAngle of turn at cut-out pointSpindle torsionT actT SA SA actA 1A 2Target torqueTorque thresholdAngle of turn at threshold torqueAngle of turn without spindle torsionAngle of turn at cut-out pointAngle of turn at reaching T S after tightening endThe tightening graph shows the angle of turn, as depicted in the graph in the BS350: The angle is onlyrecorded continuously, i.e. the angle of turn also increases if the spindle is stress-relieved and turns counterclockwise.The broken gray lines indicate the physical course of the torque over the angle of turn. Theactual angle A act is calculated as follows from measurement values A 1 and A 2 :A act = A 1 – (|A 1 –A 2 |) = A 1 – A 2 + A 1 = 2 · A 1 –A 2ExampleThe following values:A 1 = 90° and A 2 = 91.4°result in A act = 180° – 91.4° = 88.6°NoteAs the angle correction can only take place if the spindle is stress-relieved, it only applies to the target ormonitoring functions of the last tightening step or other tightening steps where the torque is reduced, suchas e.g. an NOK branch step, waiting for input, tightening step with tightening monitoringSystem 350 | 3 608 878 040/05.2008