Method of forming a powder compact

Details Method of forming a powder compact Method of forming a powder compact

B - Operations, Transporting

22

F

B22F 3/035 (2006.01) B22F 3/02 (2006.01)

Patent

CA 2363557

This invention provides a method of forming a powder compact which can produce a high density compact under a high pressure and at the same time can reduce pressure for ejecting the compact from a die. This method comprises the application step of applying a higher fatty acid lubricant to an inner surface of a heated die, and the compaction step of filling metal powder into the die and compacting the metal powder under such a pressure as to force the higher fatty acid lubricant to be chemically bonded with the metal powder and form a metallic soap coating. Since the metallic soap coating is formed between the die and a compact, friction force between the die and the compact is decreased and ejecting pressure can be remarkably decreased despite of compaction with high pressure. Besides, a high density compact can be obtained owing to the compaction with high pressure.

L'invention concerne un procédé de moulage d'une ébauche crue pulvérulente pouvant produire une ébauche crue de forte densité sous haute pression, et réduire une pression d'extraction d'une matrice. Le procédé comprend une étape de revêtement consistant à revêtir la surface intérieure d'une matrice chauffée avec un lubrifiant à base d'acide gras supérieur, et une étape de pressage consistant à remplir la matrice d'une poudre métallique et à presser cette dernière, cette pression étant le résultat de l'interaction chimique du lubrifiant à base d'acide gras supérieur et de la poudre métallique formant un film de savon métallique. Un film de savon métallique formé entre la matrice et l'ébauche crue peut y réduire une force de frottement, abaisser considérablement la pression d'extraction malgré un moulage effectué sous haute pression, et produire une ébauche crue de forte densité due à un moulage sous haute pression.

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