| 摘要 |
A method and an apparatus for producing moulded blanks by hot-pressing metal powder, preferably spherical metal powder, inside a thin-walled capsule comprising an outer sleeve (2), an insertion sleeve (4) disposed approximately centerally inside the latter, a base (3) and a cover (5), inside which one separable mould (1) of solid material may be inserted. The mould (1) and the two sleeves (2, 4) are dimensioned in such a way that between the inner insertion sleeve (4) and the mould (1) there is formed a mould cavity into which the metal powder may be poured. After the metal powder is poured in, the still open capsule is subjected to a preliminary compression by means of vibration. The capsule is subsequently closed in a gas-tight manner by means of the cover (5). Then the metal powder inside the capsule is subjected to a heat-isostatic pressing at an elevated pressure and an elevated temperature of approximately 1000 DEG to 1200 DEG C. In this way moulding blanks with a very high degree of accuracy are obtained.
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