| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for forming a can shell which are suitable especially for being used with a single action press or a double action press, and uniformly and precisely produce can shells with smallest heating at a high speed in order to avoid temperature change of tool assembly during operation.SOLUTION: Can shells are produced with tool installed on a mechanical press, and the tool includes an upper retainer supporting a blank and draw die enclosing an outer pressure sleeve and an inner pressure sleeve surrounding a die center punch, all having pistons. An air chamber is connected by air spring passages to the inner pressure sleeve piston, and the outer pressure sleeve receives the same air as the air chamber or lower pressure air. The die center punch has an insert which initiates the drawing of a cup, and the inner pressure sleeve and die center punch have contoured surfaces which mate with opposing surfaces on a die core ring to form and clamp the chuck wall of the can shell during down stroke of the press.SELECTED DRAWING: Figure 1 |
