Rexroth Tightening System 350 System Documentation - Rhino ...

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208/316 Bosch Rexroth AG | Tightening Technology 9 Tightening Processes9.2 Tightening program steps9.2.1.5 Total angle9.2.1.6 Start-up testMonitoring functions/switchingAdditional functionsThe Torque threshold is an auxiliary value for measuring the total angle. It starts counting the angle pulsesas soon as the torque measured at the bolt reaches the value stipulated for the torque threshold forthe first time. There is no angle correction (see page 204) for the total angle.Zero is set as the standard value for the torque threshold, i.e. in this case, angle measurement begins fromthe “start” of the tightening step.The start-up test recognizes at the beginning of a tightening whether a bolt has already been tightened.Here, the spindle (e.g. hand-held nutrunner) rotates with the set parameters from the activated start-uptest. If the start-up test recognizes that a bolt has already been tightened, the tightening process will beended with an NOK result.The start-up test lowers the possibility of bolt heads and output drives being torn off if an already-tightenedbolt is tightened.Standard settings for the start-up test include:– Target function: Angle 30°– Monitoring functions/switching: Torque 5%, Time 10 sec.– Additional functions: Speed 5%, Start suppression 0 ms.Angle is permanently set as the target function and Torque and Time as the switching monitoring functions.The corresponding parameters can be changed.These entries stipulate the values for Torque (in % of the nominal torque of the conFig.d nutrunner) andfor Time (sec.) for the start-up test. The limits are switching, i.e. if one of these values is exceeded, thetightening process is immediately cancelled with an NOK result.This entry specifies the value for Speed (in % of the nominal speed of the conFig.d nutrunner) that is usedto carry out the start-up test.The entry in the Start suppression field determines a time span where the torque and gradient valuesare not evaluated during the start. This function is used to ignore torque peaks when accelerating largemasses. Torque peaks may be caused by e.g. tools on the tightening spindle with large moments of inertia.Start-up test example:Figure 9–5:Parameter assignment for the start-up testThe following settings have been made for a hand-held nutrunner type ESA040G (nominal torque 40 Nm)(Fig. 9–5):– Angle value 30°– Additional function Speed 10%– Monitoring functions/switching Torque 10%, Time maximum duration 10 sec.ExplanationIf a torque larger than 4.0 Nm (= 10 % of the nominal torque) is recognized within an angle of 30° and ata speed of 10% of the nominal speed, the tightening controller will stop the tightening with an NOK result.The start-up test has recognized that the bolt has already been tightened.System 350 | 3 608 878 040/05.2008
9 Tightening Processes Tightening Technology | Bosch Rexroth AG 209/3169.2 Tightening program steps9.2.1.7 ErgoStartFigure 9–6:ErgoStart settingThe hand-held nutrunner functions ErgoStart and ErgoStart Plus influence the start-up behavior (startjerking) and thus the reaction torque that the nutrunner exerts on the worker at the start. The set functionsare active in all tightening steps.If ErgoStart is activated, the nutrunner runs with a speed change up to the target value in the form of alinear incline, with activated ErgoStart Plus in the form of a non-linear incline (i.e. first smaller then largerchanges). The steepness of the incline is dependent on the level set on the slider control. The spindleaccelerates slowest in the Max. position. The start-up behavior can be set in 5 stages from Min. to Max.NoteErgoStart can be used to gently start nutrunners with a large inertia of masses.9.2.1.8 ErgoStop functionsFigure 9–7:ErgoStop settingThe hand-held nutrunner functions ErgoStop, ErgoStop Plus, and ErgoStop Auto influence the brakingbehavior (braking jerking) of the nutrunner at the end of a tightening process. With ErgoStopPlus andErgoStopAuto, the speed is additionally adjusted to the tightening case.The ErgoStop function can be used with the following target functions:– Torque (tightening step)– Upper torque (extended tightening step)– Angle (tightening step and extended tightening step)The ErgoStop functions are deactivated if the set speed is more than 4% over the maximum spindlespeed!ErgoStopIf ErgoStop is activated, the speed in the last tightening step will be decreased linearly from the thresholdset on the slider control (no control), so that the minimum ErgoStop speed is reached when the targetvalue is reached (torque or angle of turn). The spindle brakes slowest in the Max. position. The brakingbehavior can be set in 5 stages from Min. to Max. The speed in the last tightening step may deviate fromthe programmed set value.ErgoStopPlus – Target function Torque:If ErgoStop Plus is activated, the speed in the last tightening step will be automatically controlled,depending on the tightening case hardness determined during the tightening and the target value(torque). There are 5 stages that can be selected by the user to individually vary the torque increasein the end tightening phase. As a result, the experienced reaction torque can be adjusted in 5 stagesfrom hard to soft.– Target function Angle:The speed in the last tightening step is automatically controlled using the defined target angle. Thereare 5 stages that can be selected by the user to individually vary the duration of the end tighteningphase. As a result, the experienced reaction torque can be adjusted in 5 stages from hard to soft.System 350 | 3 608 878 040/05.2008
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