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TORQUE STANDARDS AND DISSEMINATION: TORQUE APPLICATION FOR INDUSTRIES

TORQUE STANDARDS AND DISSEMINATION: TORQUE APPLICATION FOR INDUSTRIES. Calibration of high-transmission torque tools (torque multipliers) with one-sided short support. TC3 RIO WORKSHOP 2006, September 19. Diedert Peschel, Working Group TORQUE, PTB, Germany, www.ptb.de. safety engineering.

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TORQUE STANDARDS AND DISSEMINATION: TORQUE APPLICATION FOR INDUSTRIES

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  1. TORQUE STANDARDS AND DISSEMINATION: TORQUE APPLICATION FOR INDUSTRIES Calibration of high-transmission torque tools (torque multipliers) with one-sided short support TC3 RIO WORKSHOP 2006, September 19 Diedert Peschel, Working Group TORQUE, PTB, Germany, www.ptb.de

  2. safety engineering off-shore-industrie testing machines screw and assembly technology aircraft industry shipbuilding motor industy and power generation medical measurements automation engineering technical viscometer 1 mN.m 100 mN.m 10 N.m 1 kN.m 100 kN.m 1 MN.m 10 mN.m 1 N.m 100 N.m 10 kN.m Torque Scale at Physikalisch-Technische Bundesanstalt 20 kN.m 1,1 MN.m 1 mN.m APPLICATIONS of TORQUE MEASUREMENT D. Peschel, PTB, Germany www.ptb.de

  3. Different types of application 2

  4. TORQUE AND TORQUE - IT IS NOT THE SAME Important specific aspects in such applications are among others: In case of using supported beams and adaptation of the test piece with couplings with low stiffness for bending the calibration will realised under pure torque conditions. Unsupported beams generate additionally bending moment and side force so that the calibration conditions are very different from pure torque conditions. Supported beams generate the same problems, if there are not special adaptation parts to reduce side force and bending moments on the reference torque transducer.

  5. Typically calibration stand at industry für torque multipliers torque transducer

  6. sin a = - sin (a+180)

  7. Calibration equipment:basefameTB2-5-kN·m, U<0.05%TTS-1-kN·m, U<0.08%DMP40S2 or MGCplusdifferent counter supports F2max = 8 kN F1max = 0,2 kN M2max = 2 kN·m M1max = 0,3 kN·m M1 F1 F2 -F2 -F1 M2

  8. continuous measurement of transmission planetary gearbox ratio: 1 : 11.5 planetary gearbox ratio: 1 : 11.5 continuous measurements with loops

  9. results of continuous calibration for different position of the planetary wheels

  10. results: systematic deviation between the table values and calibration: 18% .....22% random influence of the planetary gearbox: 5 %

  11. 75 kN·m max. 100 kN T10FH 300 kN·m Calibration Stand for Torque Tools up to 180 kN·m (PTB)

  12. 0 0 A A 0° 180° reproducibility b for different positions <0.3% o.r. repeatability b‘ in the same position < 0.5% o.r. exp. rel. uncertainty Wke (k=2) < 0.2% o.R. systematic deviation fq = 7.5% o.f.s.

  13. The described calibration equipment up to 5 kN·m is very compact and simple • Use reference transducer with small influence for parasitic mech. components • Use costumers torque wrench, elctronic torque wrench or reference torque wrench By using reference torque wrench. continious calibration is possible, in all other cases only step-by-step procedure Wbmc < 1% typical for both calibration equipments

  14. calibration procedure(s) for torque multipliers: next step after more experiences and discussion

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