Everything about Metal Injection Moulding-MIM

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Everything About Metal Injection Moulding-MIM
Every product, by and large, revolves around molding. The process is used for lending shape to a
variety of products, ranging from a computer mouse to machine gun. There are several types of
molding processes that include Blow Mould, injection mold, and many more. Among all these
processes, the best one is injection molding as it adopts cutting-edge technology. A rising technology in
injection molding is Metal Injection Molding (MIM). Also known by the name Powdered Metal
Injection Molding (PIM), the process manufacturers metal components (with or without secondary
finishing) having tight tolerances.
The process
Prepare feedstock:- The basic materials required for MIM include thermostatic binder and
metal powders.The thermostatic binder is an intermediate processing aid that is removed from
products after the completion of the process.The properties of the metal powder determine final
characteristics
of
the
final
product.
The blended metal powder is fed to the binder (plasticized) at high temperature.The feeding is
done using either a shear roll texture or kneader. The intermediate product is called feedstock.
The
feedstock
is
granulated
(having
granule
size
equal
to
several
millimeters).
The feedstock can be either purchased from a renowned supplier or manufactured in-house by
an MIM producer.
Molding:- The parts are produced while injection molding is underway. Different types of part
geometries can be produced using this process.
Binder removal:- The molding phase is followed by binder removal process. The removal is
done to obtain parts without destroying their shapes. Different types of removal processes can
be opted by PET Preform Manufacturers in India. Some amount of binder is left in parts that
hold
metal
powder
particles
even
during
the
end
of
binder
removal
process.
The pore network in MIM, however, allows residual binders (present in metal powder holder) to
evaporate. This evaporation takes place during the beginning of sintering.
Sintering:- In the sintering phase, a large portion of pore volume (that was held by the binder)
eliminates. This elimination results in shrinking of MIM parts. The liner shrinkage ranges
between 15-20%. Also, it is possible to further process sintered MIM parts as demanded by
traditional metalworking processes.

The parts used in MIM are relatively small, thus, making the entire process cost effective.
Benefits
Design flexibility:-
The process has fewer constraints when compared with different metal forming processes
In the technique, design freedoms are extended to metals - having high melting point - such as
nickel
super
alloys,
stainless
steels,
alloy
steels
and
different
exotic
metals
Cost saving:-
Small metal parts with complex geometries never cost a bomb when MIM is used
Lean manufacturing initiatives or proper processing capabilities can be taken when following
this
process.
These
capabilities
and
initiatives
help
in
cutting
corners.
Part complexity:-
Assembly costs and part count are reduced while using MIM. Such reductions take place as the
process combines different components into a single part
Such process can easily core out unnecessary sections, thus, reducing every part's weight
Such and many more benefits help this process to be one of the prominent molding techniques.