| 摘要 |
<p>The disclosure of the present invention teaches an apparatus and method for forming ductile metal sheets into shaped bodies. In particular, it is directed to forming with the so-called superplastic metal alloys which under appropriate conditions of temperature and pressure exhibit high ductility and an ability to flow. The apparatus for use in forming ductile metal sheets into shaped bodies comprises first and second open-ended, annular chambers which are relatively movable, while maintaining their open ends in register with one another, between a position in which the open ends meet and a position in which the open ends are spaced apart; a plate in at least one of the chambers which is movable independently of both chambers in directions parallel with the directions of relative movement between the chambers between a first position in which it constitutes a gas-tight sealed base for the one chamber and a second position in which it is adjacent to open end of that chamber. Thus an improved press for use in forming ductile metal sheets into shaped bodies is disclosed which is more flexible than prior art presses. Also an improved method as taught for forming these shaped bodies is disclosed using a "snap back" technique.</p> |
