| 摘要 |
The invention relates to a method and system for forming a metal sheet, preferably in the form of a disc, in order to obtain an essentially cylindrical and essentially hollow end metal part having a base thickness that is essentially greater than the thickness of its walls. More specifically, the invention relates to the metalworking sector and, in particular, to the production of ammunition cases or shells. |
| 主权项 |
1. A sheet metal (1) forming process for obtaining an essentially cylindrical and essentially hollow final metal part (2) in a system comprising at least the following elements:
a plurality of deep drawing dies (51-5n) to perform deep drawing operations from sheet metal (1) simultaneously with ironing operations, a plurality of punches (61-6n), a plurality of blank-holder elements (81-8n) for holding or securing the part that is being deep drawn, centering and guiding elements for centering and guiding parts through the dies, a plurality of ironing dies (71-7n) to perform ironing operations in each stage simultaneously with deep drawing operations, and at least some processing means (4) suitable for giving all the preceding elements full capability to carry out the process (deep drawing and ironing force, working speed, etc.),the process being characterized in that it comprises i stages (i=1 . . . n) wherein the following steps are performed:
a) if i=1, providing the sheet metal (1), b) if i≠1, providing an intermediate metal part (3i-1), c) providing working parameters to the processing means (4) of the elements that are involved, such as operating speed of the punch (6i) and speed of the ironing die (7i), d) performing a simultaneous deep drawing and ironing operation using the working parameters, making the deep drawing die (5i), punch (6i), ironing die (7i) and blank-holder elements (8i) work simultaneously, obtaining an essentially cylindrical and essentially hollow intermediate metal part (3i) as a result, e) if i≠n, repeating from step b) providing the essentially cylindrical and essentially hollow metal part (3i) obtained in d) as the metal part,such that when i=n, the essentially cylindrical and essentially hollow final metal part (2) is obtained as a result. |
