BILZ - Spannsysteme Page 79
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Drehmoment – Leistungsberechnung beim Gewindeschneiden Torque – Power consumption calculation tapping für for: M, MF, MJ, UNC, UNF, UNEF, UN, G, Rp, NPSM, BSW, W zyl. MD = kc h² d1 Drehmoment Torque 8000 Leistung am GB Power consumption at tap Maschinen-Antriebsleistung Machine drive power Werkstoff Material P = MD n 9500 PM = P kW πM h ... Gewindesteigung Thread pitch ( mm ) d1 ... Gewinde-Nenn-Ø Thread size-Ø ( mm ) 2 Stumpfungszuschlag Gewindebohrer Factor Wornout taps n ... Drehzahl number of revolutions ( Umdr./Minute rpm ) PM ... erforderliche Maschinen-Antriebsleistung required machine drive power πM ... Maschinen-Wirkungsgrad π < 1 M machine efficiency π < 1 M kc- Wert Value N/mm² ) 3200 Stahl Steel 800 – 1000 N/mm² 2600 Stahl Steel 600 – 850 N/mm² 2500 Stahl Steel < 600 N/mm² 2300 Rostfreier Stahl Stainless steel 3200 Gußbronze Cast bronze 1900 GG-20 ( HB 170 ) 1600 GTW hart GTW hard 1250 Kupfer Copper 1100 GTW weich GTW soft 900 Ms Brass 720 AI-Si-Legierung Al-Sialloy 680 Zink-Legierung Zince alloy 440 Calculation example: Thread M 36, Pitch 4 mm, Material to be processed: Steel 900 N/mm², Speed: 50 rpm Machine efficiency πM Nm Spez. Schnittkraft Cutting force ( N/mm² ) (Tabelle chart ) kW Stahl Steel 1000 – 1300 N/mm² Berechnungs-Beispiel: Gewinde M 36, Steigung 4 mm, zu bearbeitender Werkstoff: Stahl 900 N/mm², Drehzahl: 50 Umdr./Minute Maschinen-Wirkungsgrad πM x2 kc ... Drehmoment Torque Leistung am GB Power consumption at tap Maschinen-Antriebsleistung Machine drive power MD = kc h² d1 = 2 600 8 000 P = MD n 9500 PM = P πM 4² 36 8 000 = 187 50 9 500 = 0,98 0,6 = 187 Nm = 0,98 kW = 1,6 kW Obige Berechnung gilt für neue Gewindebohrer. Bei abgestumpften Werkzeugen kann sich das Drehmoment bis auf das 3 fache erhöhen, wodurch sich auch die erforderliche Maschinenantriebsleitung um denselben Faktor erhöht. The above calculation is valid for new taps. For worn out taps the torque could be up to 3 times higher, which increases the required machine drive power by the same factor WFSL 76
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