| 摘要 |
<p>The invention relates to a method for producing a pulley (3) for motor vehicle applications, starting from a perforated flat disc (41) and comprising the steps of:
- providing a first and a second mould (1,2) each comprising a fixed annular forming cavity (8,8') and a mobile annular punch (31,31');
- arranging the starting flat disc (41) resting it on a flat head surface (27) of a flat annular blank holder element (25);
- coupling the punch (31) of the first mould (1) with the respective forming cavity (8) by pressing the flat disc (41) between the first blank holder element (25) and a shaped head portion (35) of the punch (31) itself so as to obtain a U-section annular element (42);
- arranging the annular element (42) to engage a head portion (27') having a complementary shape of a second mobile annular blank holder element (25'); and
- coupling the punch (31') of the second mould (2) with the respective forming cavity (8') so as to obtain an H section pulley (3). A device suitable for carrying out the method is also disclosed.</p> |
