Rexroth Tightening System 350 System Documentation - Rhino ...

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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
10 Working with the System Tightening Technology | Bosch Rexroth AG 259/31610.1 Settings in the BS35010.1.8.2 Correction factors for calibrating the measurement transducerThe measurement transducers are statically calibrated during production using a traced reference system.Slight deviations between the measurement value and the actual torque may appear during operation.The causes could be:– Nutrunner configuration (component wear, transverse gearboxes, etc.)– Different reference system– Dynamic influencesThese deviations can be minimized by adjusting the nutrunner configuration. Thus e.g. the redundancymeasurement transducer can also be adjusted with the primary one. Efficiency and factors (including theiruse) are described in more detail in the following.Channel-related factorsEfficiencyMCE factorThe efficiency indicated on the name plate for the components is a typical value for the individual component.It may vary by up to +/- 3%, due to production and depending on the component.The MCE factor is used for a dynamic torque adjustment of the verification system and tightening systemin the ErgoSpin.Program-related factorsTorque correctionfactor (CT)Redundancy correctionfactor (Cred)Determining CTWhen using several tightening programs, this correction factor is used for a dynamic fine torque adjustmentof the verification system and tightening system to the respective target torque value.The Cred correction factor is used to bring the primary measurement transducer in line with the redundancymeasurement transducer (or in the case of power redundancy, the torque that is derived from themotor current).The CT correction factor is determined by comparing the measurement values from the primary transducerto a reference system. To do this, a suitable tightening is carried out in the reference system (tighteningprogram is ideally like that of the actual tightening performed later). The correction factor is determinedby comparing the measurement values from the System 350 with those from the reference system:T Reference systemCT = -------------------------------------------------------T System350The determined CT correction factor is now entered in the start step of the tightening program. Thus, alltorque measurement values in this tightening program will be multiplied by CT before they are processedfurther and output.The dynamic influences are thus taken into account when determining the CT correction factor using anactual tightening.Determining CredThe Cred correction factor results from a comparison of the measurement values from the secondary (redundant)transducer with those from the primary one. The graph display in the BS350 is useful for this(Display → Graph).Fig. 10–6 shows the setting for the graph display in the BS350 operating system. The graph selectionfor the T graph and the TRed graph can be set using the >> button.The graph of the primary transducer is in black and the graph for the redundancy transducer in lightbrown.System 350 | 3 608 878 040/05.2008
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