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It is
essential to employ an engineer who understands rotational molding and RotationalMolding Design Firm China when designing a tool or mold for a
rotomolded part. Rotomolding can produce hollow parts and parts with double
walls based on the mold design. Rotational molding can incorporate unique
features into the details, such as molded threads, aluminum extrusions,
fittings, or even carbon or stainless steel components such as structural
tubing and stainless steel bushings. As rotomolding produces virtually
stress-free products, it makes exceptionally durable products. It is possible
to design products impervious to nature's elements if the proper materials are
used, such as virgin polyethylene. Various industries can benefit from
rotomolding.
Rotomolding:
Designing for the process
Ideally,
rotationally molded parts have seamless transitions between shapes or aspects
of the design. The role may be strengthened by adding ribs, kiss-off points,
and modifying angles and shapes to add rigidity and strength. You can maintain
structures with foam by adding it to some designs. The rigidity of foam-filled
parts is significantly increased and their tensile strength. As well as metal
inserts, other metal components can also be molded into products for added
strength, such as aluminum extrusions or stainless steel bushings. Several
rotomolded products are available with spin weld fittings, graphics, bulkhead
fittings, and more.
Designing
Rotomolds to Avoid Issues
During
the rotomolding design process, many design issues are revealed. Several design
issues can be avoided or designed around with little direction or education on
the front end, saving money on manufacturing or production costs later on. Here
are some tips for avoiding some common problems associated with rotomolded
designs.
Sharp
Corners
Rotomolding
produces sharp edges similar to other plastic production processes. In the
design process of a rotomolding product, sharp corners should be avoided
whenever possible. During the molding process, raw materials are prevented from
flowing through sharp edges.
By
adding a radius to a corner, many rotomolding designs can avoid sharp edges. In
this way, the visual appeal of a rotational molding design will be enhanced.
Draft
Angles
Rotomolded
products must be designed with draft angles in mind. An angle's primary purpose
is to help release the part from the mold as it cools. Simple geometric shapes
like a cube, a block, or a vertical water tank don't require a supplemental
draft, unlike geometric shapes with heavier textures or engraved details, like
company logo designs.
Material
Flow
Rotomolding
design review often finds material bridging between wall surfaces.
Consequently, the material will "bridge" or "web" between
wall surfaces when there is not enough space between them for the material to
flow.
Flat
Walls
It
isn't easy to achieve large or long flat surfaces with rotational molding.
Rotational molding produces hollow parts with no internal structure since open
structures are continuously formed. Any engineer with experience rotating parts
knows that flat walls should be avoided or long flat surfaces need to be broken
up with some geometry to give the piece some structure and minimize warpage.
Rotomolding
Design
It's
more convenient to design products and make the molds for rotomolding with
rotomolding. During the rotational molding process, the molds or tooling can be
modified after they are produced in case the product or tooling needs to be
changed.
Conclusion
In
rotomolding, shot weights can easily be adjusted by simply adding additional
material to an existing shot weight without modifying the mold.