TUBE DRAWING APPARATUS USING RADIAL ULTRASONIC OSCILLATIONS Russian patent published in 2006 - IPC B21C1/04 

FIELD: plastic metal working, possibly manufacture of different types of tubes.

SUBSTANCE: apparatus includes draw plate holder in the form of rod with through cavity for mounting draw plate; source of radial ultrasonic oscillations secured to draw plate holder and embracing draw plate. Apparatus is also provided with second source of radial ultrasonic oscillations secured to outer surface of draw plate holder and with second draw plate mounted in cavity of draw plate holder on the same axis as first draw plate. Length of draw plate holder consists of 0.2 -0.45 of length of longitudinal ultrasound wave inside its material. Draw plate holder includes two mutually joined cone portions. Length of source of ultrasonic oscillations consists of 14 - 40% of draw plate holder length. Both draw plates are mounted in such a way that distance between their centers consists of 0.057 - 0.154 of length of longitudinal ultrasound wave in material of holder. Working surface of each source of ultrasonic oscillations has conicity degree corresponding to conicity of outer surface of draw plate holder and it is normalized by means of given mathematical relation. Invention lowers risk of tube rupture due to stabilized drawing effort at stable mode of drawing that is achieved in the result of providing resonance frequency band of apparatus and lowered number of frequency errors for each source of ultrasonic oscillations.

EFFECT: increased yield of apparatus.

7 cl, 4 dwg, 2 ex