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What's MIM and Why choose MIM?

Writer： admin Source： Date：2016-05-26

MIM (Metal Injection Moulding) EXPLANATION AND OUR PROCEDURES

 MIM explanation:


The MIM process is typically explained as four unique processing steps (compounding, molding, debinding and sintering) to produce a final part that may or may not need final finishing operations. It is a net-shape process for the manufacturing of high volume high precision components for use in a diverse range of industries. MIM parts can now be found in all areas of life, from our cars and trucks to watches, dental braces,  door safe lock, mobile phones, IT equipment, DIY tools and much more.


MIM  Four Processes:


Step 1:  Feedstock

· Very fine metal powders usually (<15 microns) are mixed with a primary paraffin material and a secondary thermoplastic polymer. Together they act as binders
· Unlike standard powder metalurgy, which can achieve only 80-90% of theoretical density, MIM results in 95-100%. This means we can achieve close tolerances and reduce costs by producing small, complex parts over high production runs
Step 2: Molding
· The feedstock is fed into either our multi-slide MIM machinery or standard molding equipment, then heated and injected into a mold cavity under high pressure
· Our proprietary multi-slide tooling can produce extremely complex shapes and allow for shorter cycle times
· Once molded, the component is referred to as a “green” part
· Our multi-slide process routinely produces green parts in 3 seconds as opposed to 25-40 seconds on a standard MIM system
· Its geometry is identical to that of the finished piece, but to allow for shrinkage during the sintering phase, it’s about 20% larger in size than the finished component will be
Step 3: Dgreasing
· Binder removal or “debinding” involves a controlled process to remove most of the binders
· The process removes the binders and prepares the part for the final step – sinterin
· Once debinding is complete, the component is referred to as “brown”
Step 4: Sintering 
· The “brown” part is held together by a small amount of the binder, and is very fragile 
· Sintering eliminates the remaining binder and gives the part its final geometry
· During sintering, the part is subjected to temperatures near the melting point of the material
· The entire sintering process takes 15-20 hours
Step 5: Post-machining
· As customers requirements, may need CNC, drilling, grinding, surface coating like nickle coating, zinc coating, chrome coating etc.

Why Choose MIM Process?


  • Machining free (achieve sharp angle of R ≤ 0.1mm; Depth of Parallelism ≤ 0.02; Ra ≤ 1.6μm; tolerance in ±0.025mm-±0.05mm)
  • Excellent geometrically complexity ( achieve a hole of 0.4mm, thin wall of 1mm ) 
  • More than 98% of material utilization rate
  • Part-to-part uniformity 
  • More than 95% of theoretical density, and its performance is comparable with forging parts.
     
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Contact Us

Tel.: (86)-533-2070506 Fax.:(86)-533-2070501 E-mail: sales@no2machinery.com
Address: No.1,Hunan Road, Hutian, Zhangdian District, Zibo, Shandong Province, China.

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