In applications requiring linear motion, there are several factors to consider. You want precise, repeatable motion, but you also want low friction. Igus makes linear motion hardware using low-friction, self lubricating polymers.
According to Nils Schumacher, head of international sales, Drylin linear technology business unit, motion polymers are the base technology of igus. Without the need to lubricate or maintain polymers throughout the life of the system, igus linear motion can be more precise, lower maintenance and more dirt-resistant than traditional metal ball components.
Cutting out the need for lubricants opens the door to many applications for polymer-based motion components and new opportunities for automation. For example, systems can be run under powder, under water, or in dusty environments without suffering wear or corrosion. Igus also provides polymers temperature resistant up to 250 C.
The technology is favored in packaging and food industry automation, thanks to the unique lack of lubricants and contaminants.
Igus develops the recipes for these motion plastics in-house. They also develop innovative solutions for niche applications of linear motion, such as airplane headrests. In this case, minimum friction is not required. The assembly must move smoothly, but stay in place. For this case, igus developed a linear motion assembly which uses motion plastic, metal rails and an elastomer. The elastomer keeps the plastic in tension against the metal rail, allowing it to stay in place where it’s needed.
According to Schumacher, polymer systems can cost as much as 25% cheaper than traditional metal bearing systems. However, this number is a target set by igus to stay competitive, not a direct result of the technology. You may find other linear motion vendors may vary.
Switching from metal ball bearing systems directly to polymer is possible, but could change your performance parameters due to slightly higher coefficients of friction in the polymer systems. The durability of motion plastics depends on the application. Igus, like most vendor companies, has applications engineers on staff to help you specify the right product for your project.
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