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are various advantages to looking at the part design
from a metal injection molding perspective. For example,
features not available in other technologies can be
incorporated in part design, and often assemblies of
multiple parts can be designed as one part.
Cost advantages can be achieved by considering the
following during the design phase:
- Lettering,
Logo's
- Hexagonal,
square, blind and flat bottom holes
- Stiffening
Ribs
- Lightening
Holes
- Through
holes
- Webs
and other special features
- Protrusions
and Studs
- External
Threads
- Internal
Threads
Desirable
Features of MIM Designs:
- Gradual
section thickness changes
- Symmetrical
slots or holes
- Largest
dimensions below 100mm*
- Weight
under 100g*
- Wall
thickness under 25mm*
Constraints of the MIM process:
- No
inside closed cavities
- No
undercuts on internal bores
- Corner
radius greater than 0.2mm
- 2°
draft on long parts (0.5° minimum allowable)*
- Parting
line consideration
- Gate
location consideration
- Mold
Ejection method (pin placement)
- Smallest
hole diameter to date .0003mm (.008")*
- Minimum
Wall Thickness .0006mm (.015")*
- Minimum
Part Weight .1g*
- Maximum
Part Weight (no theoretical limit)
*These
criteria are per general application for guideline
only. Each application must be evaluated for its own
unique attributes.
Smith Metal Products has experienced design assistance
available to its customers. We look forward to helping
you with your specific requirements. Our design guide
is also available to you free of charge.
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