Heat-resistant mandrel for boss extruding

Details Heat-resistant mandrel for boss extruding Heat-resistant mandrel for boss extruding

B - Operations, Transporting

21

D

26/156

B21D 51/40 (2006.01) B21C 37/29 (2006.01)

Patent

CA 1039036

ABSTRACT A method and apparatus for forming integral coupling flanges about surface openings in hollow metallic articles. The region of the metallic article about the opening is continuously heated by means of gas burners throughout formation of the flange at a temperature which is suitable for the shaping of the metal of the article. An extruding tool, having a surface layer fabricated of material having a low thermal conduction characteristic, is moved through the surface opening of the metallic article during this heating to form the flange. The gas burners are adapted for heating both the peripheral surface of the article about the opening therein and the flange as it is formed, and the extruding tool may include an intermediate support means which supports and thermally insulates the surface layer of the extrud- ing tool on an inner support element thereof.

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