Rexroth Tightening System 350 System Documentation - Rhino ...

9 Tightening Processes Tightening Technology | Bosch Rexroth AG 205/3169.2 Tightening program stepsis then used as the target or last monitoring parameter (the torsion of the output drive has then reset itself).This so-called defined tension relief for the nutrunner is done at the end of the tightening and in the followingcases:– At the end of an extended tightening step with tightening monitoring– Before an NOK branch step– Before a conditional input branch stepIf the angle correction is not active, the maximum angle of turn in the tightening step will be output.T[Nm]T actCalculation of the angle value:A act = A 1 - (A 2 - A 1 )T SA SA act A1 A 2A[°]Figure 9–2:Course of torque over angle of turnAngle of turn without spindle torsionT actT SA SA actA 1A 2Angle of turn at cut-out pointSpindle torsionTarget 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 endTorque CtThis correction factor is used to compare the tightening system (primary transducer) with an external referencesystem (e.g. spindle comparison in test stand, load-dependent efficiency, dynamic measurement).Torque Ct determines the correction value for the comparison with the redundant system (value range:0.8 to 1.2).Torque CredThis correction factor is used to compare the primary transducer with the redundancy transducer (e.g.when using power redundancy, load-dependent efficiency of the mechanical components between bothtransducers). This compensates for the unfavorable transfer characteristics of the mechanical components.Torque Cred specifies the correction value for the comparison with the redundancy transducer (valuerange: 0.5 to 2.0).NoteThe correction factors must be separately entered and sent for each tightening program and tighteningchannel. This is why the Send to... function should not be used here!System 350 | 3 608 878 040/05.2008