Method and a system for hot hydrostatic pressing
AssigneeMLC Extrusion Systems Ltd.
InventorsVictor Lugovskoy, Vladimir Magaziner, Vitaly Chertkov, Guy Danieli
Life of this patent
Estimating the term…
Abstract
A method for hot hydrostatic pressing by means of working liquid which tends to become unstable within a transition time when in contact with a blank heated to a high working temperature and at a pressure lower than the liquid's stabilization pressure. The pressing of the blank heated to the high working temperature is carried out by raising the pressure of the working fluid to said stabilization pressure for a time shorter than the transition time. This is achieved by surrounding the heated blank by a cover adapted to delay the contact between the heated blank and the working liquid until the pressure in the working chamber is raised.
Claims7
A method for hot hydrostatic pressing by means of working liquid which tends to become unstable within a transition time when in contact with a blank heated to a high working temperature and at a pressure lower than the liquid's stabilization pressure, wherein the pressing of the blank heated to said high working temperature is carried out by the working liquid at a working pressure not lower than said stabilization pressure, and the pressure of the working liquid is raised to said stabilization pressure during a time period after said contact that is shorter than said transition time,
- said method being carried out over a heated blank placed in a working chamber of a press filled with the working liquid, and comprising the step of providing conditions for reducing said time period, wherein said step includes:
- forming a forechamber adjacent to the working chamber and isolated therefrom;
- filling said forechamber with said working liquid;
- raising the pressure of the working liquid in the forechamber to such level that, after said contact has been established, a further raise of pressure to the stabilization pressure takes less time than the transition time;
- opening a passage for the working liquid from the forechamber to the working chamber.
A system for hot hydrostatic pressing of a blank at a high working temperature by a method for hot hydrostatic pressing by means of working liquid which tends to become unstable within a transition time when in contact with a blank heated to a high working temperature and at a pressure lower than the liquid's stabilization pressure, wherein the pressing of the blank heated to said high working temperature is carried out by the working liquid at a working pressure not lower than said stabilization pressure, and the pressure of the working liquid is raised to said stabilization pressure during a time period after said contact that is shorter than said transition time;
- the system comprising:
- a press with a working chamber, said chamber having a working liquid inlet for receiving the working liquid, and being adapted to receive at least one blank,
- a high-pressure arrangement capable of raising the pressure of the working liquid in the working chamber at least to said stabilization pressure during a time shorter than said transition time;
- wherein
- said high-pressure arrangement comprises a pressure accumulation forechamber sealingly separated from said inlet by a membrane, and
- said membrane is adapted to break when the pressure in the forechamber reaches a predetermined level, thereby flushing the working liquid into the working chamber.
Dependencies are inferred from the claim text.