Process for forming a flared end tubular metal part

Claim 1

A process for cold forming an extruded, tubular metal part having an end portion whose O.D. and I.D. are flared relative to the body of the part, in a press having a fixed lower support and a downwardly movable pressure ram, comprising: positioning a short tubular, vertically axised blank, whose O.D. is approximately equal to the O.D. of the finished part, into the upper end portion of a vertically axised die opening formed in a die mounted upon the press support, which opening upper end portion is of a diameter to closely receive the blank, with the lower portion of said opening corresponding to the O.D. of the body of the part; extrudinG the lower part of the blank downwardly into the said die opening by means of moving downwardly a press ram mounted punch having an upper end portion closely fitted into the die opening upper end above and pressing downwardly against the upper end of the blank, and a punch lower end elongated cylindrical shape portion extending through the blank and a considerable distance downwardly through the die opening lower portion for thereby extruding the part into a flared upper end portion O.D. and a substantially uniform lower end portion O.D. of smaller diameter and a uniform I.D. throughout its length; thereafter positioning the extruded part in a vertical axis, with its flared end up, in a second vertically axised die opening within a die mounted upon the press support, which second opening is formed to correspond to the finished O.D. of the part; then expanding the flared upper end portion of the part outwardly to form its finished flared portion O.D. and I.D. by means of pressing downwardly through the part central opening a second punch mounted upon the press ram, which second punch is formed with an upper end portion of a diameter corresponding to the finished I.D. of the flared upper end portion of the part, and an elongated lower end portion of a diameter corresponding to the I.D. of the body of the part and of a length to extend a considerable distance through the body of the part, with the two punch portions integrally joined by a tapered central portion, for thereby expanding the part to finished I.D. and O.D. flared dimensions.