MIM 快速成型制造


mim additive manufacturing refers to an industrial process to produce small, complex metal parts at high volumes. A composite metal powder feedstock is molded into a green-state shape using injection molding equipment, debound, and then sintered to achieve full density.

MIM leverages the geometric flexibility of polymer injection molding and green-forming with the performance capability of metal alloys. With additive manufacturing processes expanding options, this guide covers MIM compositions, properties, applications, specifications, process flows, suppliers, tradeoffs, and FAQs.

mim additive manufacturing

Composition of MIM Alloys

Many compositions are available as MIM feedstocks:

不锈钢316L, 17-4PH, 420Corrosion resistant, high hardness, for medical uses
工具钢H13, P20High strength, heat resistance, for molded tooling
铝合金2024, 6061, 7075Lightweight, high strength-to-weight ratio
钛合金钛-6Al-4VLightweight with corrosion resistance and high strength for aerospace uses
镍合金Inconel 625 and 718Heat/corrosion resistance suited for turbo machinery
WHA, WCExtremely high density perfect for balancing applications

Both standard and custom formulations are available depending on needs.

的特性 mim additive manufacturing

In addition to composition tailored to performance requirements, key resulting properties include:

密度Ranges from near pure metal density to greater than 95% theoretical density
拉伸强度250 MPa to over 1300 MPa depending on reinforcement strategies
硬度Up to 70 HRC achieved based on alloy choice
耐腐蚀性Varying resistance levels possible based on compositions selected
表面粗糙度As molded <6 μm Ra up to <0.2 μm Ra after plating/polishing
Complex geometryMolding allows intricate shapes unachievable with other processes
Feature resolutionSmall slots, holes, threads down to ~100 μm » achievable
壁厚As low as ~0.25 mm walls molded based on geometry
TolerancesTighter tolerances than metal AM, typical ±0.3% of dimensions

These capabilities make MIM suitable for end-use precision components.

Applications of MIM Additive Manufacturing

MIM’s geometric flexibility and tailored composition suit various industries:

汽车Gears, rocker arms, turbocharger components
航空航天Turbine blades, impellers, nozzle guide vanes
枪支Triggers, safeties, slides, ejectors, muzzles
Medical/DentalScalpel handles, forceps, skull plates, crowns
石油和天然气Valve parts including bodies, stems, actuators
Micro ElectronicsShields, connectors, pins, spacers, actuators

MIM also helps create tooling inserts capable of mass production molding/forming operations.

MIM Feedstock Specifications

Feedstock properties require careful control for tolerance and feature capability:

Powder particle size3 – 20 μm激光衍射
粉末装载>55 vol%热重分析
Powder apparent density2.5 – 4 g/cm3霍尔流量计
水龙头密度>4 克/立方厘米攻丝容积计
Viscosity curveShear rate dependentCapillary rheometry
Pellet size distribution2 – 4 g sensitive to shape筛分

These specifications promote mold flow while ensuring green-body and sintered strength.

Overview of the MIM Manufacturing Process

  1. Develop composite feedstock with desired powder + binder system
  2. Pelletize feedstock for precision volumetric shot control
  3. Injection mold parts with tight tolerances and surface finish
  4. Chemically debind and remove polymer content
  5. Sinter pellets at >92% theoretical density
  6. Machine features as needed if geometry allows
  7. Apply supplementary plating, heat treating, coating, etc. if necessary
  8. Quality assurance testing and validation for production

This continues to be optimized for reliability at high volumes.

MIM Equipment and Feedstock Suppliers

巴斯夫Wide range of MIM alloysComplete quality feedstocks
山特维克鹗316L, 17-4PH, moreAtomization expertise transferred to MIM
MPPTool steels, stainless steels, customLeading MIM equipment too
CN Innovations定制合金Specialists in novel compositions
Parmatech CorpTi alloys, tool steels, Fe alloys, exoticsEquipment and feedstocks

Suppliers offer complementary equipment like molding machines and furnaces to enable turnkey production.

Tradeoffs When Considering MIM AM


  • Highly complex geometries and assemblies consolidated
  • Excellent mechanical properties from uniform fine grains
  • Great surface finish resolution as molded
  • Proven mass production scalability once qualified
  • Low wasted raw material relative to metal printing
  • Leverages existing injection molding know-how


  • High up front costs for feedstock formulation and tooling
  • Intensive qualification for new parts and applications
  • Limited size range to under several pounds
  • Restricted to alloys available as powders
  • Generally lower ultimate strength than forgings
  • Per-part cost higher than other processes until >10k volume

MIM hits the sweet spot for small complex metal components with its established track record.

mim additive manufacturing


How small of features can MIM practically mold?

Typical lower range limits fall around 100-150 microns for hole diameter and mold wall thicknesses around 0.3 mm (~12 thou), thinner in certain geometries.

What determines the size range limits for MIM parts?

General difficulty handling thin-walled shapes over approximately 5” flow length without sagging or distortion. Maximum thickness typically under 0.5” and weights up to 5 pound range.

Does MIM allow functionally graded (FGM) composites?

Yes, advanced molding processes now support tailored porosities or spatially graded multi-powder feedstocks within a single molded component during manufacturing.

How many alloys are commercially available as MIM feedstocks?

Over 60+ base formulations exist – 300 series stainless steels comprise over 50% of the total market, followed by tool steels, titanium alloys, and nickel superalloys seeing growth.

What finishing processes typically follow MIM?

Common secondary operations include barrel finishing/vibratory deburring, surface grinding, shot peening, laser marking, passivation, plating, heat treating, joining, and inspection.

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Metal3DP Technology Co., LTD 是一家领先的增材制造解决方案提供商,总部位于中国青岛。公司专注于工业应用领域的三维打印设备和高性能金属粉末。



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