초록 ▼

The present disclosure relates to a method for forming an end portion of a tube. The method includes rotating the tube about a longitudinal axis, heating the end portion of the tube, and forming the end portion of the tube by reciprocating a forming member along a succession of curved forming paths.

The present disclosure relates to a method for forming an end portion of a tube. The method includes rotating the tube about a longitudinal axis, heating the end portion of the tube, and forming the end portion of the tube by reciprocating a forming member along a succession of curved forming paths. Each curved forming path is tangent to and curves away from a corresponding one of a succession of angularly spaced apart, substantially straight reference lines. A forming reduction is provided between each curved forming path and its corresponding one of the reference lines.

대표청구항 ▼

[ We claim:] [1.]1. A method for forming an end portion of a tube, the method comprising:rotating the tube about a longitudinal axis;heating the end portion of the tube; andforming the end portion of the tube by reciprocating a forming member along a succession of curved forming paths, each curved f

[ We claim:] [1.]1. A method for forming an end portion of a tube, the method comprising:rotating the tube about a longitudinal axis;heating the end portion of the tube; andforming the end portion of the tube by reciprocating a forming member along a succession of curved forming paths, each curved forming path being tangent to a corresponding one of a succession of angularly spaced-apart, substantially straight reference lines, each of the reference lines being tangent to a desired final formed shape of the tube, wherein a forming reduction is provided between each curved forming path and its corresponding one of the reference lines.