| 摘要 |
In a method and an apparatus for the forming of metal can blanks with a draw-tapered wall, a metal can blank 64 is first manufactured. This blank has a smooth, essentially cylindrical wall 66, a bottom 68 integrally formed therewith at the one end of the wall, and a trimmed free edge 70, which is situated at the opposite open end of the wall, and which is essentially perpendicular to the side wall. The can blank thus formed is introduced bottom- first into a matrix 42 by means of a male die 18, which can engage with the inside of the blank at the bottom thereof, and the wall of the blank is consequently brought into greater and greater contact with a tapered inner working surface 44 in the matrix. Simultaneously with this introduction of the blank into the matrix, a longitudinal pressure is exerted by means of a thrust collar 28 and the exposed free edge of the wall is held transversely, and the blank is therefore forced right into the tapered matrix, at the same time maintaining the said pressure and holding, whilst the blank is led further and further into the tapered matrix, and until the wall comes to bear uniformly against the working surface of the matrix over a required length of the wall. <IMAGE> |
