Rexroth Tightening System 350 System Documentation - Rhino ...

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232/316 Bosch Rexroth AG | Tightening Technology 9 Tightening Processes9.2 Tightening program stepsSelect whether the tightening results should be output from the end step or the previous step with theradio button in the Tightening results field. This selection will have an effect on all data interfaces, includingthe actual value display in the BS350. Two settings may be selected:– From previous step: The result values from the tightening steps and, if necessary docu steps, completedbefore the end step are output. The results from the end step are not output.– From end step:– NOK case: Result values from the end step (results of loosening integrated in the end step) and,if necessary, docu steps, are output– OK case: Result values from the previous tightening step and, if necessary, docu steps, are output(the end step does not contain any results if OK).Loosen tighteningtoolActivate this checkbox (Fig. 9–41) to loosen a jammed tightening tool from the bolt head. This functioncan, for example, be used with OK or NOK tightening cases that are programmed without a loosen functionin the end step. After activation, the loosening parameters must be defined in the Loosen tighteningtool group field. The target functions available here include Angle and Upper torque.TSFigure 9–42:Graph with defined tension relief and subsequent loosening(1) Start angle counting (last tightening step)(2) Angle after defined tension relief(3) Start angle counting “LOOSEN”(4) Tension relief(5) End of defined tension relief = start of looseningOnce the stipulated target value (e.g. torque or angle of turn) has been reached, the tightening spindlewill be switched off and then relieved of tension according to the definition (Fig. 9–42). This defined reliefof the tension reduces the torsion that occurs in the spindle during tightening. This relief ends once thetension falls below 0.5% of the nutrunner nominal torque. The angle of turn (opposite to the tighteningdirection) necessary for tension relief is also dependent on reaching this threshold. If the Loosen tighteningtool function is active, the tightening tools turns with a specific angle of turn against the tighteningdirection after the tension has been relieved; this opposite angle of turn is related to the cut-out point beforetension relief and freely programmable. Because loosening is done after the tension has been relieved,you have to also take the angle of turn necessary for tension relief into consideration whenparameterizing the loosening function.The speed for loosening the tightening tool must be entered as a percent of the nominal speed (standardentry 5%) in the Additional functions field. The direction of rotation is automatically determined by thetightening controller depending on the last tightening step.For safety reasons, switching torque monitoring (Torque monitoring function) is used during the Loosentightening tool function, which prevents the bolt from being unscrewed during the loosening process.Angle of turn monitoring (Angle monitoring function) can be optionally used. The upper tolerance limitmust be entered for each.System 350 | 3 608 878 040/05.2008
9 Tightening Processes Tightening Technology | Bosch Rexroth AG 233/3169.2 Tightening program stepsThe process step for loosening is only documented if one of the monitoring functions for loosening is anNOK result. If loosening should also be documented for OK results, then this can only be done with atightening step and not with the “loosening function” of the end step. In this case, the loosening functionmust be deactivated in the end step.If the “Loosen” process step results in an NOK evaluation, the system will output the “Loosen (SoRel)”quality code.NoteIf both are activated, Loosen if NOK will be started first and then Loosen tightening tool.9.2.7.2 Accept valuesIf the Accept button is selected, the data is taken over in the tightening program. However, it only appliesafter the data has been sent to the controller!9.2.7.3 End step examplesThe following contains three examples for executing a column-specific end step. A column-specific endstep is executed in the following cases:Example 1The program sequence directly leads to the end step.As an example, the following table describes the evaluation of the tightening steps in the figure on theleft and their consequences for the end of the tightening process.Evaluation of thetightening stepConsequence2, A with OK End of the tightening process with end step 6, A2, A with NOK End of the tightening process with end step 5, BSystem 350 | 3 608 878 040/05.2008
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