Rexroth Tightening System 350 System Documentation - Rhino ...

9 Tightening Processes Tightening Technology | Bosch Rexroth AG 217/3169.2 Tightening program stepsExamples of an absolute torque threshold and relative torque threshold with relative torque monitoring canbe found on page 217.9.2.3.5 Relative torque monitoringRelative torque monitoring is used for the:– Target function Relative torque, upper– Target function Relative torque, lower– Monitoring function relative torque– Relative torque threshold– Gradient/Yield point– Angle.Figure 9–14:Selection of relative torque monitoringThe relation must be selected from the drop-down list in the Relative torque monitoring field (Fig. 9–14).Examples of relative and absolute torque thresholdsKnowledge of the end, average, or maximum value from the previous tightening step is a prerequisite forusing relative torque monitoring. In the following examples, the end values from the previous tighteningstep are:– Torque end value = 15 Nm,– Torque average value = 13 NmExampleStart angle counting from the relative torque thresholdFigure 9–15:Angle target function and relative torque thresholdIn Fig. 9–15, the absolute torque threshold is: 5 Nm + end value 15 Nm of the previous step = 20 Nm.When the relative torque threshold of Ts = 5 Nm (absolute: 20 Nm) is reached, angle counting to fulfillthe Angle = 360° target function will be started.ExampleStart angle counting from the absolute torque thresholdFigure 9–16:Angle target function and absolute torque thresholdWhen the absolute torque threshold of Ts = 20 Nm is reached, angle counting to fulfill the Angle = 360°target function will be started.System 350 | 3 608 878 040/05.2008