| 摘要 |
The invention concerns a method which consists in heating flat thermoplastic blanks (12) and in carrying out a thermoforming step wherein the heated blanks are plastically deformed by stretching. Prior to the thermoforming step, it consists in performing a punching step wherein a peripheral region of the blanks is deformed by punching while the material of the blanks is trapped on the outside. The installation comprises means for heating (16) the blanks (12), thermoforming means (24), and a punching tool (26, 28) for deforming the peripheral regions of the blanks before they are thermoformed.
|
