| 摘要 |
A method of reducing the porosity of a casting (e.g. aluminum or al alloy) by subjecting the casting at elevated temperature to isostatic compression comprising the following steps:… (a) locating the casting (10) in a surrounding container (11) having at least one wall provided with at least one through-going channel (13),… b) heating the container with the enclosed casting… c) placing the heated container with the enclosed casting in a press chamber (20) of a fast-acting press, as for example a piston press,… d) filling said press chamber with a liquid pressure medium at a lower temperature than that of the heated container and casting, and… e) rapidly applying pressure to the liquid pressure medium. …<??>Thus the liquid pressure medium is rapidly forced through the channels in the walls of the container and thereby heated up by extracting heat from the walls of the container. |
