Rexroth Tightening System 350 System Documentation - Rhino ...

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242/316 Bosch Rexroth AG | Tightening Technology 9 Tightening Processes9.4 Example parameterizationsFigure 9–49:PLC assignment table (input signals) of the tightening controller after processing9.4.3 Special tightening processes: Loosening/retightening processesThe loosening/retightening process is described here as an example of a special tightening process. It isused to tighten waxed or plastic-coated parts and is characterized by tightening and loosening the boltsseveral times to displace the wax or plastic under the screw head. Fig. 9–50 illustrates an example of thecourse of the graph T = f (A) during the loosening/retightening process and table 9–4 illustrates the associatedparameterizations.[Nm]Screw Finden Tightening Festschrauben 1 1 Loosen Lösen Festschrauben Tightening 2 2[o]Figure 9–50:Example of the course of the graph during a loosening/retightening processSystem 350 | 3 608 878 040/05.2008
9 Tightening Processes Tightening Technology | Bosch Rexroth AG 243/3169.4 Example parameterizationsPrg_Loosen_Retight programTable 9–4: Explanation of the tightening program Prg_Loosen_Retight.Step Parameters ExplanationStart 1, A - Start of tightening programScrew in 2, A Target function: Angle 1400° Bolt is screwed inAdditional function: Speed 120 rpm Positive speed, as positive direction of rotation of the spindleMonitoring function: AngleA–: 1350°, A+: 1450°Angle of turn monitoringTightening 1 * 3, A Target function: Torque 10 Nm Tightening of parts with 10 Nm until screw head is flushAdditional function: Speed 30 rpm Positive speed, as positive direction of rotation of the spindleMonitoring function: TorqueT–: 9.5 Nm, T+: 10.5 NmTorque monitoringLoosen 4, A Target function: Angle 360° Bolt is loosened by one revolutionAdditional function: speed –100 rpm Negative speed, as negative direction of rotation of the spindleMonitoring function: AngleA–: 350°, A+: 370°Angle of turn monitoringTightening 2 5, A Target function: Torque 12 Nm Tighten the parts with 12 NmAdditional function: Speed 18 rpm Positive speed, as positive direction of rotation of the spindleMonitoring function: TorqueT–: 11.5 Nm, T+: 12.8 NmTorque monitoringEnd 6, A - End of the tightening program* Note: First tightening in the loosening/retightening process is approx. 10% below the end tightening torque.System 350 | 3 608 878 040/05.2008
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Bosch Rexroth AGElectric Drives and
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