Hard metal body with hardness gradient, such as punching tools

Details Hard metal body with hardness gradient, such as punching tools Hard metal body with hardness gradient, such as punching tools

C - Chemistry, Metallurgy

22

C

C22C 1/05 (2006.01) B22F 3/08 (2006.01) B22F 7/02 (2006.01)

Patent

CA 2421429

The invention relates to a method for the production of a body made of hard metal, consisting of a hard compound A and a binder B, wherein pulverulent A and B, or an optionally precompacted article that contains A and B, are introduced into a container and the material containing A and B is compacted in order to increase the relative density (RD) to a value that is higher than 70% of the theoretical maximum density (TMD). The invention further relates to a body of hard metal comprising a hard compound A and a binder B, the mass ratio of A:B gradually changing over a cross-section of the body in order to impart to said body different mechanical properties in one zone Za or to one end (T) and hardness in one zone Zb or to another end (H). The invention also relates to the use of dynamic compaction techniques for the production of such bodies.

L'invention concerne un procédé de production d'un corps fait de métal dur, constitué d'un composé dur A et d'un liant B ; A et B sous forme de poudre, ou un article éventuellement précomprimé renfermant A et B, sont introduits dans un contenant et la matière renfermant A et B est comprimée afin d'accroître sa densité relative (DR) à une valeur supérieure à 70 % de la densité maximale théorique (DMT). L'invention concerne en outre un corps fait de métal dur incluant un composé A et un liant B, le rapport de masse A:B changeant progressivement en coupe transversale afin de conférer à ce corps différentes propriétés mécaniques dans une zone Za ou en direction d'une extrémité (T), et une dureté différente dans une zone Zb ou en direction d'une autre extrémité (H). L'invention concerne aussi l'utilisation de techniques de compression dynamique pour la production de ces corps.

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