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Metal Injection Molding (MIM) or Powder Injection Molding (PIM) is a net-shape process for the production of highly complex metal components in medium to very high annual volumes. This design guide is intended to serve as a reference for applying MIM/PIM design principles to new components and evaluating existing components for possible conversion to this manufacturing technology. Properly designed MIM parts maximize the economic benefits of the process by ensuring that net shape results and targeted dimensional Cpk’s are attained. Contents: MIM application characteristics, MIM design criteria, Uniform wall thickness, coring & mass reduction Sintering supports Draft – where & when Corner breaks & fillets Holes & slots Undercuts – external/internal6 Threads
Ribs & webs Knurling, lettering & logos Gating – types & location Sink & knitlines 23 Minimum & maximum wall thickness Flash & witness lines Interchangeable mold inserts Dimensional tolerances Secondary operations Heat treating Surface finishes & plating.
Since injection molding is employed as the shape forming process step in MIM, part designs can avoid the limitations of traditional metalworking processes. For example, machining involves the removal of material from a solid shape to get to the desired final component design. During the debinding and high temperature sintering processes, molded parts (or green parts) shrink about 20%. While the parts are shrinking and before the parts can fully sinter, the forces of gravity and friction (from shrinking) may distort the parts if they are not adequately supported.
Tags : metal injection moulding, metal injection molding, uniform wall thickness, powder injection molding, maximum wall thickness, metalworking processes, mold inserts, solid shape, mass reduction, secondary operations, component design, sintering, metal components, cpk, design criteria
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