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Process flow

  • 01
    Mixing and granulation
    The metal powder and the bonding agent are uniformly mixed and then granulated. The raw material after granulation is similar to the plastic compound. This process is called feeding.
  • 02
    Injection molding
    After the feed is heated to the plasticized state, it is injected into the mold cavity with an injection machine to form. At this time, the product is grayish brown, in a semi-plastic state, and can be broken with a little force.
  • 03
    Degreasing
    Degreasing is the use of chemical or thermal decomposition to remove the binder in the injection blank, leaving only the metal powder. At this time, the product is off-white, in a powder state, and will collapse when touched.
  • 04
    Sintering
    In a vacuum environment, the product is densified by high temperature and high pressure sintering, and the product becomes a high-density and high-strength metal part.
  • 05
    Plastic surgery
    Like other processes, MIM parts can be subjected to various types of surface treatments to meet the various needs of different customers.
  • 06
    Inspection shipment
    Various quality monitoring plans are implemented for customers' special size and reliability requirements to ensure quality and quantity shipments.

Post-processing process

PVD
Painting
EP
Polishing

Post-processing

Internal process:

Magnetic slipping, sandblasting, middle wire walking, tempering, passivation


Outsourcing process:

Surface effect: polishing, wire drawing, flat grinding, sandblasting

Surface treatment: PVD, DLC, electroplating, electrophoresis, blackening, phosphating

Texture: laser carving, etching

Size control: turning processing, CNC

Heat treatment: solid solution, aging, nitriding, carburizing

Tolerance control ability

Size General MIM tolerance control capability Fangchi tolerance control capability
General tolerance Individual tolerance
1-4mm +/-0.05 +/-0.02 +/-0.015
4-10mm +/-0.10 +/-0.04 +/-0.03
10-20mm +/-0.15 +/-0.08 +/-0.05
20-30mm +/-0.25 +/-0.10 +/-0.07


Features Normal range Special case
Product weight 0.2g-100g 0.08-200g
Product wall thickness 0.5mm-10mm 0.15mm or more


The maximum size of the part is affected by the following cost factors:

The larger the part, the higher the overall cost (higher raw material prices)

The thicker the part, the longer the degreasing time