| 摘要 |
A welded tapered tube is made by deforming a flat, elongated trapezoidal sheet of metal into an elongated, U-shaped trough in a wagon open at its top and having a U-shaped trough for a bottom. The wagon moves along a track to carry the U-shaped sheet past a series of fin rolls, which deform the U-shaped sheet into an oval-shaped, tapered tube with a seam running the length of the tube. The wagon and tube thereafter move past a welding station where the seam is forged and welded together to form an elongated, tapered tube with an oval-shaped cross section, which may be squeezed between two elongated and semicircular die cavities to form a tapered tube of circular cross section.
|
