Cost, delivery and flexibility

The MIM cost equation involves several factors ranging from alloy to packaging requirements.

 

Tooling cost

At the beginning, tool cost is a barrier, especially if the design is not fully worked out. In this regard MIM tends to project an inflexible character. For example, a sophisticated four-cavity mould    used in cell phone production costs more than $30,000 each.

Any reworking of that mould to change the design is a cost and time barrier. A few vendors have innovated means to reduce the time and cost for the first mould, including use of polyurethane or aluminium moulds. Curiously, it appears that only half of the moulds created for MIM ever go into production.

Mould cost in MIM tends to be highly variable. In one case, eight vendors quoted prices for the same mould that ranged from $27,000 to $70,000, and delivery times from 8 to 12 weeks. This says that diligence is required to sort out the various claims and determine the best options when ordering tooling.

Since many firms formulate their own feedstock to keep down production costs, a mould customised to that feedstock is not necessarily useable by another firm.

 

Influence of feedstock price

Part costs are dominated by feedstock price. Table 4 is a contrast of component costs between two vendors on the same part, where vendor A uses self-mixing and vendor B relies on purchased premixed feedstock (values are dollars per part). Such a table shows how feedstock cost goes right to the bottom line. Note, that if vendor A adopted continuous processing in debinding and sintering (such as used by vendor B), then the potential component cost would drop to $0.76.

In a sensitivity analysis for MIM part cost [7], it was determine that feedstock cost was the most important factor. It was followed by component mass, process yield and other production factors. Clearly, designs that remove mass and ensure high process yields lead to the greatest success.

Factor Vendor A Vendor B Notes
Feedstock 0.35 0.67 Vendor B purchases pre-mixed feedstock
Moulding 0.17 0.37 Vendor A is in a lower labor rate area
Tooling 0.13 0.13 No difference
Debinding 0.11 0.04 Vendor A relies on batch processing
Sintering 0.34 0.07 Vendor B relies on continuous processing
Piece cost 1.10 1.28 Vendor A gets the job

Table 4 Contrast of component costs between two vendors on the same part, where vendor A uses self-mixing and vendor B relies on purchased premixed feedstock (values are US$ per part)

 

Continue to next page: Overview: key criteria for selecting MIM technology

 

Industry News

Read the latest issue of PIM International

The latest issue of PIM International magazine is available to view online or download in PDF format.

As well as an extensive MIM, CIM industry and sinter-based AM industry news section, this 124-page issue includes the following exclusive articles and reports:

  • Bosch Advanced Ceramics: Driving ceramic Additive Manufacturing for series production with Lithoz
  • High precision, flexibility and intensive customer support: How Demcon MIM is planning ahead for long-term growth
  • Playing the long game: The story of Binder Jetting, and ExOne’s view on a rapidly evolving technology landscape
  • Riding the storm: A review of progress in China and Taiwan’s MIM industry during 2020
  • Advanced Powder Injection Moulding process developments presented at Euro PM2020
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