PIMVINA

MIM

What is MIM Metal Injection Molding?

MIM is the new generation technology in metal component production, which combine conventional power metallurgy technology and injection molding technology for precise plastic component production.

Plastic Injection Molding
Powder Metallurgy
Powder Injection Molding

MIM stands for Metal power injection molding, and combines advantages from each injection molding and power metallurgy to proceed mass production of precise and complicated small components with competitive price, and satisfy various requests from designers by giving flexibility to metal component design. In this technology, it makes Feedstock by mixing metal power and binder, makes a shape of parts, eliminate binder without deformation of parts shape, and give mechanical properties to parts as close as theoretical density of powder.

Advantages

1.Material flexibility
2.Minimize internal defects
3.Cost reduction
4.Massproduction without / with minimization of machining
5.Shape precise 3D figures
6.Flexibility of part design
7.High precision degree and fine surface roughness
8.Eco-friendly, technology-intensive

Typical material & properties

Typical material & properties
Material	Composition	Density(%)	Y.S.(MPa)	T.S.(MPa)	Elongation(%)	Hardness
SUS316L	Fe-17Cr-12Ni-2Mo-2Mn	98	175	520	50	120HV
17-4PH	Fe-17Cr-4Ni-4Cu	98	750	900	10	350HV
SUS440C	Fe-16Cr-1Mn-1Nb	98	410	620	8	430HV
SUS440J2	Fe-13Cr-1Mn-1Si	98	230	550	15	200HV
SUS304L	Fe-18Cr-8Ni	98	240	480	35	150HV
AISI4140	Fe-1Cr-0.9Mn-0.25Si	98	420	650	5	200HV
2%Ni-Fe	Fe-2Ni	98	200	400	25	140HV
GHS-4	Fe-12Cr-40Ni	98	560	800	4	330HV
HK30	Fe-25Cr-21Ni	98	350	540	8	160HV
DIN 1.4091	Fe-36Cr-16Ni-2Mo-1Mn	98	550	750	8	310HV

Process

step.01

Kneading(metal powder + binder)

This process makes feedstock by mixing powder and binder using Kneading machine.
step.02

Injection(make a shape of parts)

It is similar to plastic injection molding process. Metal powder and melt is co-exist at this process, control of process parameter such as pressure, temperature, and speed is crucial.
step.03

Debinding(Eliminate binder max 95%)

This process eliminates binder which used for making a shape of parts. There is thermal debinding process and catalyst debinding proess, and we are using thermal debinding process by using controlled atmosphere gas.
step.04

Sintering(Give mechanical properties)

As a final process of MIM, it gives debinded parts mechanical properties by increasing sintering temperature.