Custom Reliable MIM Metal Parts Consumer Electronics Hearing Equipment Accessories
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Product Details
MIM metal parts are precision components manufactured through Metal Injection Molding, combining plastic injection molding’s design freedom with the strength of wrought metals. Ideal for complex, small-to-medium parts (0.3g–250g) at high volumes (5,000+ units/year), achieving tight tolerances (±0.5%) and near-full density.
What are MIM Metal Parts?
MIM (Metal Injection Molding) metal parts are produced by mixing fine metal powder (typically 60% by volume) with a thermoplastic binder (40%) to create a feedstock. This mixture is injection molded into a precision die, forming a “green part.” Subsequent debinding removes the binder, and high-temperature sintering (1,000°C+) fuses the metal particles into a dense, strong component. The process combines the geometric complexity of plastic injection molding with the mechanical properties of machined or forged metals, producing parts with densities exceeding 95–99% of theoretical values.
Material Specifications:
| Material Category | Common Grades | Density (g/cm³) | Tensile Strength (MPa) | Key Applications |
| Stainless Steel | 316L, 17-4PH, 304L, 420, 410L | 7.6–7.9 | 480–1,100 | Medical, aerospace, automotive, firearms |
| Low-Alloy Steel | 4605, Fe-2Ni, 4140, 4340, 8620 | 7.4–7.8 | 450–1,200 | Gears, structural components, automotive |
| Titanium Alloys | Ti-6Al-4V, CP-Ti | 4.4–4.5 | 900–1,000 | Aerospace, medical implants, lightweight parts |
| Copper Alloys | C110, Cu-Ni-Sn | 8.4–8.9 | 200–500 | Electrical connectors, thermal management |
| Cobalt Alloys | Co-Cr-Mo (ASTM F75), Stellite 6 | 8.3–8.9 | 650–1,200 | Medical implants, turbochargers, wear parts |
| Tungsten Heavy Alloys | W-Ni-Fe, W-Cu | 17–18.5 | 600–900 | Radiation shielding, counterweights, thermal mgmt |
| Tool Steel | M2 (SKH51), D2, H13 | 7.6–8.0 | 1,200–2,000 | Cutting tools, wear-resistant parts |
| Magnetic Alloys | Fe-50Ni, Fe-49Co-2V | 7.8–8.2 | 400–800 | Sensors, magnetic cores, actuators |
| Nickel Superalloys | Inconel 625/718, Hastelloy | 8.2–8.5 | 800–1,200 | High-temperature, corrosion-resistant parts |
Surface Finishes:
| Finish | Method | Characteristics | Typical Thickness |
| As-Sintered | Direct from sintering furnace | Matte gray; Ra < 3 µm | N/A |
| Bead Blasting | Glass or ceramic media | Uniform matte; hides surface imperfections | N/A |
| Mirror Polishing | Mechanical/electrochemical | Reflective finish; smooth (Ra 0.1–0.4 µm) | N/A |
| Passivation | Chemical treatment | Removes free iron; enhances corrosion resistance | N/A |
| Electropolishing | Electrochemical | Bright finish; removes burrs; improves cleanability | 0.005–0.025 mm removed |
| Electroplating | Chrome, nickel, copper, silver, gold | Decorative; wear/corrosion resistance | 3–50 µm |
| Burnishing (Black Oxide) | Chemical conversion | Black finish; mild corrosion resistance | < 2 µm |
| PVD Coating | Physical vapor deposition | Hard coating; decorative colors | 1–5 µm |
Applications:
| Industry | Typical Components | Part Weight | Key Requirements |
| Medical & Dental | Surgical instruments, orthodontic braces, hearing aid components, implantable devices | 0.5–50 g | Biocompatibility (ISO 13485); corrosion resistance |
| Aerospace | Turbine blades, engine components, structural brackets | 10–150 g | High strength-to-weight; AS9100; traceability |
| Automotive | Transmission parts, turbocharger components, engine sensors, locking systems | 5–200 g | High wear resistance; IATF 16949; fatigue strength |
| Consumer Electronics | Smartphone hinges, camera parts, micro hinges for eyewear, connector pins | 0.3–20 g | Miniaturization; high volume; cosmetic finish |
| Firearms | Cartridge cases, trigger assemblies, safety selectors, sights | 2–50 g | High strength (100,000+ psi); reliability |
| Industrial Machinery | Gears, pneumatic components, tool holders, pump parts | 10–200 g | Wear resistance; dimensional stability |
| Defense | Ordinance components, communication housings, tactical equipment | 10–150 g | MIL-SPEC; ruggedness; traceability |
| Jewelry & Watchmaking | Watch cases, bracelet links, decorative components | 1–50 g | Fine detail; aesthetic finish; precious metals |
Best Practice Application Example:
Scenario: Micro hinge component for high-end foldable smartphone – converting from MIM metal parts.
A consumer electronics OEM faced production constraints manufacturing titanium alloy micro hinges for a new foldable smartphone. The original CNC machining process required 12 minutes per hinge, generated 85% material waste, and limited production to 8,000 units/month—insufficient for projected demand of 500,000 units/month. The hinge required ±0.02 mm tolerances with wall thickness as low as 0.25 mm .
Selected Solution: The engineering team transitioned to MIM metal parts using Ti-6Al-4V titanium alloy.
Process Parameters:
Feedstock: Ti-6Al-4V powder (D90 < 22 µm) + proprietary binder system
Injection molding: 4-cavity tool; cycle time 12 seconds per shot
Debinding: Catalytic debinding at 120°C for 4 hours
Sintering: Vacuum sintering at 1,260°C for 3 hours; density > 98%
Secondary: Electropolishing removes 0.01 mm material; achieves Ra 0.4 µm
Results:
Cycle time reduction: From 12 minutes (CNC) to 3 seconds per hinge (MIM)—99.6% reduction
Material utilization: > 95% (vs. 15% with CNC machining)
Production capacity: 1 million units/month (125× increase)
Cost per part: $0.85 (vs. $4.20 CNC)—80% reduction
Quality: 99.7% yield; tolerances maintained across 5 million parts
Lead time: 8 weeks (tooling) + 2 weeks (production vs. 12 weeks CNC)
Product Advantages:
- Complex geometries of MIM metal parts: Achieves undercuts, thin walls (down to 0.2 mm), internal threads, and intricate details impossible with machining
- Cost efficiency of MIM metal parts: 25–65% lower cost than conventional manufacturing for complex parts at volumes >5,000 units/year
- Material properties of MIM metal parts: Density > 95–99% of wrought; mechanical strength comparable to forging
- Tight tolerances of MIM metal parts: ±0.3–0.5% dimensional accuracy; further precision via secondary operations
- High volume of MIM metal parts: Economical from 5,000 to millions of units annually
- Material versatility of MIM metal parts: Stainless steels, titanium, copper, cobalt, tungsten, nickel alloys
- Surface finish options: As-sintered (Ra < 3 µm) to mirror polish; plating; passivation
Why Choose Us?
- ISO 9001, ISO 13485, AS9100 certified facilities with full material traceability
- 30+ years MIM expertise across automotive, medical, aerospace, and consumer electronics
- In-house tooling design and manufacturing – faster iterations, lower costs, reduced lead times
- Full-process capability: Feedstock development → injection → debinding → sintering → secondary finishing → assembly
- Quality assurance: CMM inspection, tensile testing, density verification, 100% visual inspection for critical applications
- Scalable production: Prototypes to millions of parts annually; 0.3g–250g part weight range
