Ironing of cylindrical cups by using transversely-vibrated rectangular die
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Publication Details
Author list: Kaewtatip P., Jin M., Murakawa M.
Publisher: Hindawi
Publication year: 2011
Start page: 356
End page: 360
Number of pages: 5
ISBN: 9783514007840
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
In order to apply ultrasonic vibration to forming tools, the tools must have the same resonant frequency as the frequency of the input vibration, leading to extremely large size of the tools and setups. In this work, the compact-sized ironing die has been proposed. Normally, ironing die is composed of tungsten carbide tip shrink-fitted into the steel case. The steel case of the proposed die is redesigned into rectangular shape which is different from conventional circular one. The die is vibrated reciprocally by changing the shape of the die hole into elliptical shape in transverse direction. Cup ironing experiments of aluminium (A1050) and steel (SPCE) are performed to evaluate the effectiveness of the proposed ultrasonically-vibrated rectangular die. The frequency and amplitudes of vibration are 14.5 kHz and 11-15 jum, respectively. Ironing ratio is 37.5 %, while ironing speed is approximately 275.2 mm/s. The results show that, by applying ultrasonic vibration, ironing force can be reduced up to 50 %. Surface roughness values of the ironed cups obtained from conventional ironing and ultrasonically vibrated ironing are almost the same level. However, distribution of the cup wall thickness is found to be more uniform by applying vibration. Finally, the roundness of the ironed cup is also improved by exerting the vibration. ฉ 2011 IBF (RWTH Aachen) & IUL (TU Dortmund).
Keywords
Sheet forming
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