In the pressing process due to the friction
between the wall of the mould and the powder and powder and powder, the
pressure distribution is very uneven, resulting in the pressed blank in the
microstructure is not uniform. This will cause pressed powder metallurgy parts
in sintering shrinkage is not uniform, so we had to reduce sintering
temperature to reduce this effect, so that products of porosity, material
density, low density, seriously affecting the product mechanical properties.
Whereas the injection molding process is a
kind of fluid molding process, adhesive guarantee the powder evenly distributed
which eliminates the uneven microstructure of blank, and sintering the density
of the products can reach to the theoretical density of the material. In
general, the density of the product can be compressed to a maximum of 85% of
theoretical density. The high density of the product can increase the strength
and toughness, and the ductility, the conductive heat conductivity and the
magnetic properties can be improved.
High efficiency, easy to achieve large
quantities and large-scale production of MIM technology using the metal mold,
and its life and engineering plastic injection molding tool quite. Due to the
use of metal molds, MIM is suitable for the mass production of parts. Due to
the use of injection molding machine is blank, greatly improves the production
efficiency, reduces the production cost, and the injection molding product
consistency and repeatability, to provide a guarantee for large batch and
large-scale industrial production.
Application materials a wide range, the
broad field of application (iron, low alloy, high speed steel, stainless steel,
G valve alloy, hard alloy) can be for injection molding material is very
extensive, in principle any, including traditional manufacturing process of
difficult to machine materials and high melting point materials, pouring hot
junction of powder materials can be by MIM process caused by parts. In
addition, MIM metal injection molding can also be based on the requirements of
the user material formulation research, manufacture any combination of alloy materials,
the composite material into parts. The application field of injection molding
products has been widely used in various fields of national economy, and has a
broad market prospect.
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