Precision Metal Injection Molding (MIM) Service
Advanced powder metallurgy for tight-tolerance, high-density components with integrated secondary operations.
ISO 14001:2015 ISO 9001:2015 IATF 16949:2016
Metal Injection Molding (MIM) Overview
Metal Injection Molding (MIM) is an advanced powder metallurgy process that combines the design freedom of plastic injection molding with the strength, durability, and performance of solid metals. Ideal for small, complex, high-volume precision components, MIM delivers near-net-shape parts with exceptional dimensional control, uniform microstructure, and cost efficiency unmatched by traditional machining or casting.
We needed 50,000 miniature, high-strength planetary gear sets for our collaborative robot joints. Machining was too slow and costly. SinoCMI’s multi-cavity MIM tooling delivered Fe-8Ni gears with excellent tooth profile accuracy and density. Their integrated deburring and heat treatment gave us ready-to-install components.
Metal Injection Molding Material & Processing Technology
Alloy Material Portfolio
- Stainless Steels: 17-4PH, 316L, 420 – corrosion resistance, high strength, hardness
- Low-Alloy Steels: Fe-8Ni, Fe-Ni – high tensile strength, cost efficiency
- Tool Steels: M2 – wear resistance, cutting performance
- Special Alloys: Kovar, Invar, tungsten alloys – controlled expansion, high density
- Titanium Alloys: Ti-6Al-4V – biocompatibility, high strength-to-weight ratio
- Soft Magnetic Alloys: Permalloy, Fe-Si – magnetic permeability, sensor applications
- Feedstock Formulation: Fine metal powder (<20μm) mixed with thermoplastic binder
- Precision Injection Molding: High-volume production of complex 3D geometries
- Catalytic/Thermal Debinding: Binder removal to form porous metal structure
- Controlled Atmosphere Sintering: 96–99% dense parts with predictable shrinkage
- Secondary Sizing & Coining: Ultra-tight tolerance correction for critical features
Metal Injection Molding Standards & Specifications
- Quality Certifications: ISO 9001:2015, ISO 14001:2015, IATF 16949:2016
- Part Density: 96–99% of theoretical metal density
- Standard Tolerances: ±0.3–0.5% of dimension; critical features ±0.1%
- Surface Finish: Ra 1–2μm (as-sintered)
- Minimum Wall Thickness: Down to 0.5mm
- Ideal Part Weight: <1g to ~250g
- Production Volume: 10,000 to millions of parts annually
Key Metal Injection Molding Capabilities & Equipment
- Precision multi-cavity MIM tooling design and manufacturing
- Automated feedstock mixing and pelletizing systems
- High-pressure precision injection molding machines
- Catalytic and thermal debinding furnaces
- Controlled-atmosphere high-temperature sintering furnaces
- CNC machining centers for post-process precision finishing
- CMM and optical measurement systems for dimensional validation
- Density testing, hardness testing, and material property verification
- Vibratory finishing, passivation, plating, and PVD coating lines
Key Metal Injection Molding(MIM) Applications
Medical & Dental
Surgical instruments, orthopedic tools, laparoscopic components, dental brackets, implant parts.
Consumer Electronics
Device hinges, camera shutters, connector housings, wearable chassis, precision fasteners.
Automotive & e-Mobility
Fuel injectors, sensor housings, lock components, turbocharger vanes, transmission parts.
Firearms & Defense
Triggers, safeties, sights, complex mechanical components, high-wear parts.
Industrial & Hardware
Precision gears, impellers, fluidic components, tool inserts, magnetic shielding parts.
Check Out the ToolkitEngineering-Led Production Process
- DFMIM (Design for MIM) consultation and design optimization
- Precision tooling design and multi-cavity mold development
- Metal powder and binder feedstock formulation
- High-precision injection molding
- Catalytic or thermal debinding
- Controlled-atmosphere sintering
- Coining/sizing for critical tolerance correction
- Heat treatment to enhance mechanical properties
- Precision CNC machining for high-precision features
- Surface finishing and coating
- Full dimensional and material quality inspection
- Packaging and on-time delivery
Metal Injection Molding Quality & Calibration Assurance
- First Article Inspection (FAI) with full dimensional validation
- Statistical Process Control (SPC) for real-time production monitoring
- CMM and optical comparator high-precision measurement
- Sintered density and mechanical property testing
- Full material composition certification and traceability
- Non-destructive and destructive quality validation
- Regular equipment calibration and process stability control
- Continuous quality improvement and compliance monitoring
One-stop Metal Injection Molding(MIM) Production Solution
We provide fully integrated end-to-end MIM manufacturing services from design and tooling to production, finishing, and quality inspection. Our vertically integrated process ensures consistent quality, shorter lead times, lower material waste (below 5%), and cost efficiency for high-volume miniature and complex metal components.
Check Out the Toolkit
FAQs About Metal Injection Molding (MIM)
What is Metal Injection Molding (MIM)?
expand_less expand_moreA: Metal Injection Molding (MIM) is an advanced manufacturing process that combines the design flexibility of plastic injection molding with the strength and integrity of wrought metals. It involves mixing fine metal powders with a thermoplastic binder, injecting the mixture into a mold, then removing the binder (debinding) and sintering the part to high density.
What materials can be used in MIM?
expand_less expand_moreA: MIM is compatible with a wide range of alloys, including: · Stainless Steels (e.g., 17-4 PH, 316L, 420)。 · Low-Alloy Steels。 · Tool Steels。 · Nickel-Based Superalloys (e.g., Inconel 718)。 · Cobalt-Chrome Alloys。 · Titanium Alloys (e.g., Ti-6Al-4V)。 · Tungsten Heavy Alloys。 · Soft Magnetic Alloys (e.g., Fe-Ni, Fe-Si)
What are the typical mechanical properties and tolerances of MIM parts?
expand_less expand_moreA: · Density: Typically >96% of theoretical density, often >99%. · Mechanical Properties: Tensile strength, hardness, and elongation are comparable to wrought or cast equivalents. Specific data is material-dependent. · Tolerances: Standard linear tolerances are ±0.3% to ±0.5% of the dimension. Critical features can often be held to ±0.1% with process optimization. Tighter tolerances may require secondary operations like machinin
Are there design limitations for MIM?
expand_less expand_moreA: While highly flexible, MIM has some design guidelines: · Wall Thickness: Uniform walls (typically 0.5mm - 10mm) are preferred to avoid distortion during sintering. · Draft Angles: Small draft angles (0.5°-2°) are recommended for easier ejection. · Part Size: Ideal part weight ranges from <1 gram to ~250 grams. Larger parts are possible but require specialized equipment. · Internal Features: Holes and channels are easily molded, but very small holes (<0.1mm) may be challenging.
Can MIM parts be finished or treated after sintering?
expand_less expand_moreA: Yes. Common secondary operations include: · Machining: For achieving ultra-tight tolerances on specific features. · Heat Treatment: For enhanced hardness or strength.
· Surface Finishes: Plating (Ni, Cr, Au), passivation, black oxide, polishing, bead blasting. · Joining: Welding, brazing, or adhesive bonding.
How is quality controlled in the MIM process?
expand_less expand_moreA: Quality is controlled at every stage: · Feedstock: Homogeneity checks. · Molding: Statistical process control (SPC) for injection parameters. · Sintering: Precise atmosphere and temperature control in continuous furnaces. · Final Inspection: Dimensional checks (CMM, optical comparators), density measurement, mechanical testing, and visual inspection per ISO 9001/ISO 13485 standards.
Related Metal Injection Molding (MIM) Resources
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