Importance

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Abstract

A mechanical process to reduce and/or reform the mass of a tube (either metallic or of some other material) to specified dimensions, by any or all of the following means: thinning the wall of the tube, reducing the diameter of the tube, and elongation of the tube. The tube is operated on by a ball and a die having interior areas including: an initial entry with reduction angle, a wall reduction chamber, a final reduction angle, a land/bearing, and an exit relief ending in an area with a reverse taper. The tube has an outside diameter larger than the wall reduction chamber (in the raw material starting size) with a wall thickness somewhat larger than the gap between the outside diameter of the ball, and the inside diameter of the wall reduction chamber. The tube is pulled, pushed or drawn between the die and the ball, reducing its dimensions.

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First Claim