Bauser, an injection molding company specialized in precision parts located in
Wehingen, Germany, has successfully introduced a production process for
automotive gears, using DSM Engineering Plastics Stanyl PA46 annealing
technology. The company was the first plastic gear supplier in Germany to
jointly commercially introduce the technology, almost 2 years ago.
Annealing is a high temperature after-treatment of an injection molded part,
during which significant morphological changes occur. Stanyl is annealed when
heat treated above its glass transition temperature [Tg80°C], but below its
melting temperature [Tm295°C], preferably at temperatures around 220°C for 2 -
4 hours.
Hans Wennekes, Business Development Manager Stanyl, explains: “After
annealing, the parts generally have up to 35% higher mechanical properties
above Tg, as well as increased wear and creep performance. A positive side
effect is the reduction of moisture uptake by 35%.”
The effects obtained through annealing are irreversible. At the indicated
annealing temperatures (>210°C), a nitrogen atmosphere is recommended to avoid
any thermal oxidation of the material. The process is especially applied when
aspects like performance, durability and safety has to be boosted.
According to Bauser’s CEO, Michael Bauser, the process provides a
cost-effective solution, especially for niche applications: “This secondary
operation increases the performance of actuators significantly and gives the
developer the freedom to use standard technology without applying exotic
materials or totally new designs.”
Key applications for annealed Stanyl gears are those with high demands on load
or safety performance and where polyacetal cannot be used. These include wiper
systems, sliding doors, roof systems using worm gear actuators. In
non-automotive, the process can be used for general applications such as
sliding, folding and roll-up door openers.
Bauser is a main partner in a new extensive Gear Research Program (Project
Lead DSM EP) with a focus on innovative steel replacement solutions applied in
future under the hood applications, details will be enclosed in the upcoming
years.
