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Manufacturability design of MIM parts

Writer： Admin Source： MDM Date：2019-07-26

The design of MIM parts is similar to plastic injection molding. Free from the limitations of traditional metal-forming
processes, part designers can start by re-imagining new parts from a new point of view, how production processes can
reduce material weight, combine multiple parts into a single part, or shape functional and decorative features.
1. Technological design
The simplest MIM parts are produced with a cavity formed by a flat combination of two half moulds.(reference: MIM mold
structure)
Among them, the half mold is installed in the other half of the mold with a uniform gap of the core, the remaining uniform
gap is in order to form a uniform wall thickness of the parts.
Core forming is the structural characteristics of the parts inside, while cavity forming is the structural characteristics of the
parts outside.
All structural features of the design must be formed parts that can be extruded from the cavity and solidified from the core
by means of ejectors.
As the complexity of MIM parts increases, sliders, cores, and other tools commonly used in plastic injection molding can
be added.
When the structural features of the parts are added, the complexity of the parts increases. At this time, the MIM parts can
gain economic benefits by eliminating the operating costs of tools and technical equipment related to the subsequent
processing or assembly operations.
At each stage of the design, these benefits and costs must be carefully weighed against each other.
When designing MIM parts, the following key points must be considered to fully obtain all the benefits of this process:
uniform wall thickness, thickness transition section, core-removal hole, stripped-off Angle, stiffening rib and spoke plate,
chamfering and rounding, thread, hole and groove, root cutting, casting system, parting line, decorative features, sintered
support, etc.
These are described below.
1.1 uniform wall thickness
If possible, the wall thickness of the entire MIM component should be the same. Different thicknesses can cause warping,
internal stress, holes, cracking, and dents. In addition, it will lead to uneven shrinkage and affect dimensional tolerance and
control.
The thickness of parts should be within the range of 1.3~6.3mm.
1.2 thickness limited
In some cases, the wall thickness cannot be uniform, the different thickness should be designed to gradually transition.
1.3 cored hole
The use of core removal can reduce the cross section to the criterion limit, reach uniform wall thickness, reduce material
consumption and reduce or eliminate machining operations.
The preferred direction is parallel to the opening direction, in other words, perpendicular to the parting line.
Because the core rod is supported at both ends, so it is best to use through hole, not blind hole, blind hole is used by the
cantilever bar.
1.4 stripping slope
The stripper slope is a small Angle on the surface that is parallel to the direction of movement of the model part.
For the core bar, to be particularly accurate.
The demoulding inclination is for the convenience of the demoulding and ejecting molding parts. The release Angle is
usually 0.5 degrees to 2 degrees. The actual demodulation inclination increases with the depth of forming hole or concave
and the complexity of parts or the number of cores.
1.5 reinforcing ribs and spokes
Reinforcing ribs and spokes are used to reinforce thinner walls and avoid thick sections.
In addition to increasing the strength and stiffness of the wall thickness, it can also improve the flow of materials and limit
distortion.
The thickness of the reinforcing ribs shall not exceed that of the adjoining walls. Thick stiffening ribs are required
structurally and should be replaced by multiple stiffening ribs.
1.6 chamfering and rounding
Chamfering and rounding can reduce the stress at the intersection of structural features .Eliminate the sharp Angle that may
lead to the characteristic cracking and corrosion of the model structure, facilitate the flow of injection material into the
model and help the parts to come out of the mold cavity, and facilitate the molding operation.
1.7 thread
Both internal and external threads can be formed by MIM process, but compared with unscrewing the core, tapping threads
are more precise and cost effective.
In order to get rid of the model components that screw out the molded thread, the model part of the molded thread, the
external thread is best located in the parting line of the model construction.
In order to maintain thread diameter tolerance, it is generally required that there is a small plane of 0.127mm on the parting
line, as shown in FIG. 7, which can ensure that the model is properly sealed, reduce the trace of parting line, avoid burr at
the root of thread, and thus reduce the maintenance of the model.

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