Case Study Approach in the MIM Process
Metal Injection Molding (MIM) is an advanced manufacturing technology in which fine metal powders are compounded with polymer binders, shaped by injection molding, and subsequently converted into fully dense metal parts through debinding and sintering processes.
This technology is particularly preferred for:
- Complex geometries
- High dimensional accuracy
- Series production requirements
- Metal parts that are not economical to produce by machining
Processing MIM feedstocks with very high metal powder content requires exceptional process stability, precise dosing, and vibration-free machine mechanics.
Dr. BOY injection molding machines meet these requirements through stable injection behavior, accurate shot control, and robust mechanical design, making them a reliable production platform for MIM applications.
The following case studies present real industrial MIM parts supported by detailed technical and numerical data.
Case Study 1 - Spray Nozzle Made from 316L Stainless Steel
Application Description
Production of a compact, high-surface-quality spray nozzle manufactured from 316L stainless steel for industrial fluid systems. The part is designed to meet functional tolerances after sintering.
Technical Data
Part type: Spray nozzle
Material: 316L stainless steel (MIM)
Final part weight: 6.55 g
Green part weight: 7.15 g
Shot weight: 45.5 g
Machine: BOY 22 M
Screw diameter: 22 mm
Cycle time: 31 s
Number of cavities: 4
Runner system: Runner distributor + pin gate + gate
Process Challenges
High metal powder loading, balanced filling in a multi-cavity mold, and preservation of green part integrity were the main challenges in this application.
Dr. BOY Advantage
Precise injection control enabled uniform filling of all four cavities, producing crack-free green parts without segregation or surface defects.
Case Study 2 - Static Mixer from Highly Filled MIM Feedstock
Application Description
A static mixer component with extremely complex internal channels, used in fluid mixing systems. The mold incorporates multiple sliding mechanisms and processes a highly filled MIM feedstock.
Technical Data
Part type: Static mixer
Material: Metal powder MIM feedstock
Part weight: 1.02 g
Shot weight: 4.2 g
Machine: BOY 22 M
Screw diameter: 18 mm
Cycle time: 21 s
Number of cavities: 2
Runner system: Pin gate (Stangenanguss)
Process Challenges
Highly complex internal geometry, high powder loading, and synchronized operation of sliding mold mechanisms posed significant process risks.
Dr. BOY Advantage
Vibration-free machine motion and stable filling behavior ensured successful molding of complex geometries without voids, fractures, or binder separation.
Case Study 3 - Precision MIM Gear with Internal and External Teeth
Application Description
Manufacturing of a metal gear with both internal and external teeth for precision mechanical systems. The part requires high axial and radial accuracy after sintering.
Technical Data
Part type: Internal / external gear
Material: MIM 316L stainless steel
Part weight: 1.51 g
Shot weight: 2.3 g
Machine: BOY 35 A - 15
Screw diameter: 14 mm
Cycle time: 23 s
Number of cavities: 1
Runner system: Pin gate
Process Challenges
Accurate filling of fine tooth profiles, prevention of green part deformation, and maintenance of post-sintering dimensional accuracy were critical.
Dr. BOY Advantage
Precise injection control and stable clamping force resulted in sharp tooth geometry, smooth surfaces, and excellent dimensional accuracy after sintering.
Case Study 4 - Highly Complex, Large-Volume MIM Part (Guitar Tuner)
Application Description
Production of a highly complex guitar tuner used in musical instruments. This component is recognized internationally as a benchmark MIM application due to its geometry and dimensional requirements.
Technical Data
Part type: Guitar tuner
Material: MIM 316L stainless steel
Part weight: 109.33 g
Shot weight: 121.5 g
Machine: BOY 90 A
Screw diameter: 36 mm
Cycle time: 28 s
Number of cavities: 1
Runner system: Pin gate + connector
Process Challenges
Large part volume, high shot weight, and control of green part cracking risk were the primary challenges.
Dr. BOY Advantage
High mechanical rigidity and stable injection characteristics enabled reliable production of large MIM components with excellent dimensional accuracy.
Overall Evaluation - Results of the MIM Case Studies
These metal injection molding case studies clearly demonstrate the strengths of Dr. BOY injection molding machines in MIM applications:
- Compatibility with 316L stainless steel and highly filled metal powders
- Wide application range from micro parts to high shot-weight metal components
- Stable filling in multi-cavity and complex molds
- Reliable preservation of green part integrity
- High dimensional accuracy after sintering
Conclusion - Why Choose Dr. BOY for Metal Injection Molding?
Dr. BOY injection molding machines represent more than standard injection equipment in MIM processing; they provide a reliable engineering platform for high-precision metal part production. These real industrial case studies clearly demonstrate why Dr. BOY is a preferred solution for metal powder injection molding applications.
