Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Robots are coming to aircraft assembly

20.09.2011
Up to now, aircraft have been put together in huge assembly cells, but to build the necessary facilities is expensive and time-consuming.

That is why Fraunhofer researchers have come up with a flexible assembly-line concept that features robots working in the same way they do in automotive production. The developers are presenting their new manufacturing approach at the Composites Europe trade fair in Stuttgart in Hall 4, Booth D03. One of this future assembly line’s first elements can also be seen there: a versatile component gripper made of lightweight CFRP (carbon fiber reinforced plastic).


This modular, lightweight, carbon fiber reinforced plastic gripper is able to flexibly grasp and handle aircraft components. It was developed by the Fraunhofer Project Group Joining and Assembly FFM. (© Fraunhofer IFAM)

Aircraft parts are simply enormous. Individual fuselage segments alone can measure ten meters or more. But they need to be fitted together with the utmost precision. The maximum deviation from plan that aircraft manufacturers can tolerate is 0.2 millimeters – on components that weigh several metric tons. To position the giant parts accurately, manufacturers rely on massive production facilities known as assembly cells. These are huge gantries that move along the fuselage like container cranes on steel rails and massive concrete foundations, for instance bolting aluminum parts together. It takes a lot of money and effort to build this kind of assembly cell – and they need to be built from scratch for each new kind of aircraft, which pushes their production and construction costs even higher.

This state of affairs calls for automation concepts and facilities to make aircraft assembly – and in particular high-precision drilling, milling and adhesive bonding – simpler, more flexible and more economical in the future. And that is exactly what developers in the Fraunhofer Project Group Joining and Assembly FFM at the Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen, are working on at the research center CFK Nord in Stade. Theirs is a totally new assembly philosophy: Aircraft will in future be machined – and their parts increasingly bonded together – by a host of small industrial robots, much as we see in today’s automotive sector. Dr. Dirk Niermann, head of the Fraunhofer FFM, and his team of developers have come up with a design for a suitable facility that would replace the common assembly cell: They envision fuselage segments, tail fin and wings sitting atop a kind of rolling assembly line and being carried past one-armed robots, akin to automotive production methods. These robots then work at various points on the parts in succession to bond, drill and mill them as they pass. Of course, a facility of this kind would still need to be tailored to each new aircraft type, but the installation costs incurred would be significantly lower.

At the Composites Europe 2011 trade fair from September 27 to 29 (Hall 4, Booth D03), the scientists from Stade will be presenting the first key element of their new assembly line: a gripper that can deal flexibly with various geometries of aircraft component. "Aircraft are made up of shells of varying curvatures, and a gripper system has to be able to adjust accordingly," says Niermann. This is done using configurable arrays of suction pads that sit on robust joints. The suction pads are mounted on a framework structure made of carbon fiber reinforced plastic that is both sturdy and considerably lighter than metal. Thanks to its low mass, industrial robots can position the gripper and the component with exceptional precision.

The gripper concept might seem only too simple, but in fact handling the components is a real challenge. Once they are put together, the dimensions of these large aircraft parts can deviate from plan by up to several millimeters as a consequence of their being fitted to the fuselage. Up to now, the fitting of these components into the fuselage has been painstakingly done by experienced technicians working on the assembly cell.

The parts are sometimes even compressed or bent slightly in order not to breach the overall 0.2 millimeter tolerance. In future, it will be up to the robots and the gripper to achieve this. "That’s why we’re developing a high-precision recognition system to measure the components exactly during assembly," says Niermann. This is combined with powerful software that takes fractions of a second to calculate the precise position in which the robot has to hold the workpiece to make everything fit together perfectly. However, there is one more challenge: Aluminum, the classic aircraft material, is increasingly being replaced by CFRP. But, unlike aluminum sheeting, CRFP components are unyielding during assembly, so they sometimes need to be assembled under tension.

While technicians have developed a feel for how much tension is permissible, which allows them to assemble these parts manually, robots don’t know how to do this yet. Nonetheless, Niermann and his colleagues are certain that they will have an initial demonstration facility up and running around three years from now. The gripper can already be seen at Composites Europe, and the Fraunhofer Project Group Joining and Assembly FFM is also presenting its entire robotic aircraft assembly concept there.

Sarah Ernst | EurekAlert!
Further information:
http://www.fraunhofer.de/en/press/research-news/2010-2011/21/aircraft-assembly-cells-gripper.jsp

More articles from Trade Fair News:

nachricht High Resolution Laser Structuring of Thin Films at LOPEC 2017
21.03.2017 | Fraunhofer-Institut für Lasertechnik ILT

nachricht Open ecosystem for smart assistance systems
20.03.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO

All articles from Trade Fair News >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

When Air is in Short Supply - Shedding light on plant stress reactions when oxygen runs short

23.03.2017 | Life Sciences

Researchers use light to remotely control curvature of plastics

23.03.2017 | Power and Electrical Engineering

Sea ice extent sinks to record lows at both poles

23.03.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>