| 摘要 |
<p>The improved half-die comprises a concave rigid support (4) describing a chamber (5) superiorly closed by an elastic wall (6) and containing a pressurised incompressible fluid. The chamber (5) internally comprises a lattice (8) which divides it into a plurality of cavities (9) which are interconnected by means of communication holes (15); each cavity (9) is occupied by an obturator (13) which is solidly anchored to the elastic wall (6) and free of the walls of the relative cavity (9). Should there be a loss of fluid pressure, which can occur only through an inlet hole (10) and an outlet hole (11) used for introducing the fluid during a construction phase of the half-die and subsequently closed, the obturators (13) prevent any further fluid from exiting during a pressing operation and enable the half-die to keep working. <IMAGE></p> |
