Replacing Steel with Engineering Plastics (Plastic-for-Steel Substitution)

Using PEEK and other engineering plastics instead of metal for robot structural and transmission parts, to cut weight and cost.

This refers to substituting engineering plastics — such as PEEK (polyether ether ketone), POM, fiber-reinforced nylon, and carbon-fiber composites — for steel and aluminum in structural parts and some transmission parts, such as housings, frames, gears, and bearing cages. Humanoid robots chase both lightweighting and lower mass-production cost, which has drawn attention to this approach; reports say programs such as Tesla's Optimus have been evaluating PEEK components, which has driven interest in related stocks. The benefits are a density far below steel's and the ability to be injection-molded in bulk; the trade-offs are stiffness, heat resistance, and creep resistance (slow deformation under sustained load) that fall short of metal, so parts usually need to be redesigned rather than simply swapped one for one.

ExampleSwitching a joint housing from machined aluminum alloy to an injection-molded, carbon-fiber-reinforced PEEK part makes it lighter and lets it be formed in a single shot, instead of CNC-machined piece by piece.

Also called

Plastic-for-Steel Substitution, Plastic-for-Metal Substitution

Related

Polyether Ether Ketone (PEEK) · Lightweighting (Magnesium Alloy / Carbon Fiber) · Bill of Materials (BOM) Cost · Mass Production · Humanoid Robot

Sources

Polyether ether ketone - Wikipedia