Within the framework of Industrie 4.0 the aircraft manufacturing industry has embarked on an automation offensive. This involves moving away from customized machinery for special processes towards universal mobile robots. The ProsihP II project "Efficient, highly productive, precision machining of large CFRP structures", which was funded by the State of Lower Saxony, involved experts from a wide range of disciplines who set out to develop technology for the mobile, high-precision machining of large CFRP components using robots working in parallel.Spurred on by their own innovation, the project team has now achieved the ambitious objective of the project.
Last week Fraunhofer IFAM scientists and their project partners presented the intelligent milling system at Research Center CFK NORD in Stade.
The conventional portal machines currently in use are expensive and do not allow rapid measuring and parallel processing. When processing carbon fiber reinforced plastics (CFRPs) in particular, the process monitoring cannot prevent machining errors, resulting in irreparable damage to materials and high reject rates and associated costs.
The objectives of the ProsihP II project, carried out over the last three years, were therefore very clear:
A mobile platform for industrial robots was designed in order to realize a very versatile machine concept and give the desired degree of freedom for positioning the machining systems on components. A prerequisite for good machining results here is adequate static and dynamic stability. In collaboration with the project partners, the automation team at Fraunhofer IFAM designed and built a mobile platform suitable for interchangeable heavy-duty robots from all manufacturers. The cost-efficient mobile platform was constructed from standard, commercially available components and is firmly positioned on the floor for the machining work with the aid of three supports.
This prevents any destabilization of the platform. To change location, the platform extends its three wheels over the supports. The whole structure has total freedom of movement and can even turn on the spot.
Industrial robots of up to three tonnes in weight can be mounted on the universal connection plate of the mobile platform. The project requirements on the absolute positioning and path precision of the total system, which comprised the robots and mobile platform, were so high that it was necessary to significantly increase the accuracy of the selected robots.
To achieve this, the robot kinematics were fitted with a CNC control system (Siemens SINUMERIK 840D sl), compatible motors, and secondary encoder systems on each axis for correcting positional deviations. In addition, an advanced camera system registers the actual position of the robot, so allowing realtime correction by comparison with target data. The final result of the development work is one of the most precise machining robots in the world.
Both the procedure employed and the technological components have the advantage that they can be employed for any robot kinematics. A significant step was thus taken towards a standard for absolutely accurate robots in the aircraft manufacturing industry.
At the end of the development phase, the self-adaptation of robot-based milling processes to different component geometries and positions was successfully tested on a 7 x 2 meter CFRP vertical tail plane shell of an Airbus A320. The system is, however, also designed for much larger components of up to 30 meters. It can, for example, be used for machining of various primary aircraft structures such as wing and fuselage sections.
Furthermore, with only minor modification, the mobile robot system can be used, for example, for machining wind turbine rotor blades, sections of rail vehicles and large components for shipbuilding.
Aicon 3D Systems GmbH, Airbus Operations GmbH, Artis GmbH, CTC GmbH Stade, IPMT der TU Hamburg, Ludwig Schleicher Anlagenbau GmbH, Mabi AG, mz robolab GmbH, Siemens AG, and Volkswagen AG
Fraunhofer IFAM wishes to thank the Lower Saxony Ministry for Economic Affairs, Employment, and Transport, the NBank as well as the Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR) for funding the ProsihP II project (ZW 3-80140004).
Dipl.-Biol. Martina Ohle | Fraunhofer-Gesellschaft
How electric heating could save CO2 emissions
17.12.2018 | Technische Universität München
Data use draining your battery? Tiny device to speed up memory while also saving power
14.12.2018 | Purdue University
Different eras of civilization are defined by the discovery of new materials, as new materials drive new capabilities. And yet, identifying the best material...
Researchers from the University of Basel have reported a new method that allows the physical state of just a few atoms or molecules within a network to be controlled. It is based on the spontaneous self-organization of molecules into extensive networks with pores about one nanometer in size. In the journal ‘small’, the physicists reported on their investigations, which could be of particular importance for the development of new storage devices.
Around the world, researchers are attempting to shrink data storage devices to achieve as large a storage capacity in as small a space as possible. In almost...
The more objects we make "smart," from watches to entire buildings, the greater the need for these devices to store and retrieve massive amounts of data quickly without consuming too much power.
Millions of new memory cells could be part of a computer chip and provide that speed and energy savings, thanks to the discovery of a previously unobserved...
What if, instead of turning up the thermostat, you could warm up with high-tech, flexible patches sewn into your clothes - while significantly reducing your...
A widely used diabetes medication combined with an antihypertensive drug specifically inhibits tumor growth – this was discovered by researchers from the University of Basel’s Biozentrum two years ago. In a follow-up study, recently published in “Cell Reports”, the scientists report that this drug cocktail induces cancer cell death by switching off their energy supply.
The widely used anti-diabetes drug metformin not only reduces blood sugar but also has an anti-cancer effect. However, the metformin dose commonly used in the...
12.12.2018 | Event News
10.12.2018 | Event News
06.12.2018 | Event News
19.12.2018 | Materials Sciences
19.12.2018 | Materials Sciences
19.12.2018 | Life Sciences