Studies on Ultrasonic Metal Tube Drawing (1)

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Author has initiated research and development activities for ultrasonic metal tube drawing in order to achieve a shortened drawing process together with increased efficiency and improved product quality. In application of the ultrasonically vibrating power to metal tube drawing, the vibrational power may be transmitted either to the plug or the die, or to the both. For the preliminary test, the author employed the method in which the plug was ultrasonically vibrated. Results of the preliminary test showed that the industrial metal tube drawing required vibrational power of several kilowatts. This made it necessary to effectively superimpose a plurality of ultrasonically vibrating power produced from a plurality of ultrasonic transducers. For this superposition purpose, several ultrasonic power accumulators were invented and designed. Results of the experiments showed that vibrational power from 72 pieces of ultrasonic transducers could be focused. A vibration system was constructed in which this ultrasonic power was transmitted to the plug through a 10m long mandrel with an outside diameter of 20mm. A 20kW ultrasonic metal tube drawing tester was thus realized. Metal tube drawing tests were conducted by driving the vibration system from a 20kW high frequency power generator. Changes in the drawing force for metal tubes due to the application of ultrasonic power to the plug were measured by a load cell. In the first test, 34mm-outside-diameter blank tubes with a wall thickness of 3.25mm were drawn into 25.4mm-outside-diameter product tubes with a wall thickness of 2.20mm at an area reduction ratio of 48.9% and a drawing speed of 11.1m/min. The amplitude of the plug vibration was varied. For the amplitude of about 10μm, the force exerted on the plug was reduced by about 0.7t (75%) and that on the die was reduced by about 0.7t (17%). It was confirmed that these reductions depended upon the amplitude of plug vibration. In the second test, 30 or 34mm-outside-diameter blank tubes, with a wall thickness of 2.25∿3.0mm, were drawn into 25.4mm-outside-diameter product tubes with a wall thickness of 2.20mm at an area reduction ratio of 18.3∿45.0%. The force exerted on the plug was reduced by 50∿90% and that on the die was reduced by 10∿20%. Results of these tests paved the way for studies in the future.
湘南工科大学の論文
1980-07-31

Studies on Ultrasonic Metal Tube Drawing (1)

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