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Ossbahr, Gilbert
Publications (10 of 10) Show all publications
Jonsson, M. & Ossbahr, G. (2010). Aspects of reconfigurable and flexible fixtures. Production Engineering, 4(4), 333-339
Open this publication in new window or tab >>Aspects of reconfigurable and flexible fixtures
2010 (English)In: Production Engineering, ISSN 0944-6524, Vol. 4, no 4, p. 333-339Article in journal (Refereed) Published
Abstract [en]

The design and manufacture of fixtures and other dedicated tooling for positioning of workpieces are among the major cost drivers in product industrialization. This has spurred research and commercial interest towards other fixturing solutions like reconfigurable fixtures, with the ability to be changed, or  reconfigured , to suit different parts and products. When reconfiguring, the product interface not only has to be moved but moved to a desired position and orientation. Several different approaches have been used to move and position these devices, all with their own advantages and disadvantages. This article presents different methods used to position and reconfigure flexible fixture devices using a parallel kinematic device as a case. Discussing the different ways to reconfigure a flexible device, the article aims to arrange the techniques according to their key features.

Place, publisher, year, edition, pages
Heidelberg: Springer Berlin, 2010
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-63174 (URN)10.1007/s11740-010-0256-z (DOI)
Projects
KooFixProFlexaFlexa
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2013-01-30
Olsson, T., Haage, M., Kihlman, H., Johansson, R., Nilsson, K., Robertsson, A., . . . Brogardh, T. (2010). Cost-efficient drilling using industrial robots with high-bandwidth force feedback. Robotics and Computer-Integrated Manufacturing, 26(1), 24-38
Open this publication in new window or tab >>Cost-efficient drilling using industrial robots with high-bandwidth force feedback
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2010 (English)In: Robotics and Computer-Integrated Manufacturing, ISSN 0736-5845, E-ISSN 1879-2537, Vol. 26, no 1, p. 24-38Article in journal (Refereed) Published
Abstract [en]

Here we present a method for high-precision drilling using an industrial robot with high-bandwidth force feedback which is used for building up pressure to clamp-up an end-effector to the work-piece surface prior to drilling, The focus is to eliminate the sliding movement (skating) of the end-effector during the clamp-up of the end-effector to the work-piece surface, an undesired effect that is due to the comparatively low mechanical stiffness of typical serial industrial robots. This compliance also makes the robot deflect due to the cutting forces, resulting in poor hole position accuracy and to some extent in poor hole quality. Recently, functionality for high-bandwidth force control has found its way into industrial robot control systems. This could potentially open up the possibility for robotic drilling systems with improved performance, using only standard systems without excessive extra hardware and calibration techniques. Instead of automation with expensive fixtures and precise machinery, our approach was to make use of standard low-cost robot equipment in combination with sensor feedback. The resulting sliding suppression control results in greatly improved hole positioning and quality. The conceptual idea behind the force control is useful also in many other robotic applications requiring external sensor feedback control.

Place, publisher, year, edition, pages
Elsevier, 2010
Keywords
High-precision drilling, Force control, Feedback, Motion control, Industrial robotics
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-52371 (URN)10.1016/j.rcim.2009.01.002 (DOI)000271620900003 ()
Available from: 2009-12-18 Created: 2009-12-18 Last updated: 2017-12-12Bibliographically approved
Jonsson, M. & Ossbahr, G. (2010). Development of a new flexible fixturing device for Affordable Reconfigurable Tooling. In: Terje K. Lien (Ed.), 3rd CIRP Conference on Assembly Technologies and Systems: Responsive, customer demand driven, adaptive assembly. Paper presented at 3rd CIRP Conference on Assembly Technologies and Systems (CATS2010), June 21-22, Trondheim, Norway (pp. 103-108). Trondheim: Tapir Akademisk Forlag
Open this publication in new window or tab >>Development of a new flexible fixturing device for Affordable Reconfigurable Tooling
2010 (English)In: 3rd CIRP Conference on Assembly Technologies and Systems: Responsive, customer demand driven, adaptive assembly / [ed] Terje K. Lien, Trondheim: Tapir Akademisk Forlag, 2010, p. 103-108Conference paper, Published paper (Refereed)
Abstract [en]

To use thin wedges of metal to adjust fixtures, i.e shimming, has been a common approach to achieve desired position and tolerance. To build a fixture using shims is time-consuming and results in a fixture that is difficult to modify. The newly developed ART (Affordable Reconfigurable Tooling) concept addresses the need for flexible fixturing by means of reconfigurable supports that are set to desired position by guidance from an outer measuring system. The ART concept can be realized by means of several different reconfigurable devices, among these is the newly developed “Mini Flexapod”. This small 6 degree of freedom reconfigurable device was designed to eliminate shimming and therefore has a small working envelope of approximately 4x4x4 mm. The Mini Flexapod is a result of working with several manufacturing cases  described in this paper.

Place, publisher, year, edition, pages
Trondheim: Tapir Akademisk Forlag, 2010
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-63186 (URN)9788251926164 (ISBN)
Conference
3rd CIRP Conference on Assembly Technologies and Systems (CATS2010), June 21-22, Trondheim, Norway
Projects
Fixture, Fixturing, RMS, FMS, Tooling; Assembly technology
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2016-05-26Bibliographically approved
Jonsson, M., Murray, T., Robertsson, A., Stolt, A., Ossbahr, G. & Nilsson, K. (2010). Force Feedback for Assembly of Aircraft Structures. In: Proceedings of the SAE 2010 Aerospace Manufacturing and Automated Fastening Conference & Exhibition. Paper presented at SAE 2010 AMAF. SAE International
Open this publication in new window or tab >>Force Feedback for Assembly of Aircraft Structures
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2010 (English)In: Proceedings of the SAE 2010 Aerospace Manufacturing and Automated Fastening Conference & Exhibition, SAE International, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Variability in composite manufacture and the limitations in positional accuracy of common industrial robots have hampered automation of assembly tasks within aircraft manufacturing. One way to handle geometry variations and robot compliancy is to use force control. Force control technology utilizes a sensor mounted on the robot to feedback force data to the controller system so instead of being position driven, i.e. programmed to achieve a certain position with the tool, the robot can be programmed to achieve a certain force. This paper presents an experimental case where a compliant rib is aligned to multiple surfaces using force feedback and an industrial robot system from ABB. Two types of ribs where used, one full size carbon fiber rib, and one smaller metal replica for evaluation purposes. The alignment sequence consisted of several iterative steps and a search procedure was implemented within the robot control system. The technology has the potential to lessen the need for dedicated tooling, reduce the need for traditional workspace calibration and can be used in several other applications, such as pin and socket type assemblies found in pylons or landing gear or “part to part” assemblies such as leading edge ribs to spar.

Place, publisher, year, edition, pages
SAE International: , 2010
National Category
Control Engineering Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-63177 (URN)10.4271/2010-01-1872 (DOI)
Conference
SAE 2010 AMAF
Projects
ProFlexa
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2010-12-30
Jonsson, M. & Ossbahr, G. (2009). Affordable Reconfigurable Tooling using Mini Flexapods. In: Proceedings of The International 3'rd Swedish Production Symposium. Paper presented at SPS'09.
Open this publication in new window or tab >>Affordable Reconfigurable Tooling using Mini Flexapods
2009 (English)In: Proceedings of The International 3'rd Swedish Production Symposium, 2009Conference paper, Published paper (Refereed)
Abstract [en]

Manufacturing processes are subject to increasing product changes, product diversity and customisation, higher quality demands and shorter lead times, all of which are drivers for new flexible approaches to manufacturing. As a result modular and reconfigurable fixture solutions have been both researched and commercialized. One of these is the ART, “Affordable Reconfigurable Tooling” concept, which relies on an external measuring system rather than internal accuracy of all fixture parts. Traditionally for dedicated fixtures shims are often used to achieve desired position and tolerances. This paper presents the “Mini Flexapod”, a small 6 degree of freedom reconfigurable device as part of the ART concept. The Mini Flexapod is designed to eliminate shimming and therefore has a small working envelope of approximately ± 4mm. Three different designs of the Mini Flexapod are presented, together with an illustrative application case from aircraft manufacturing. Further work will be done to improve design and to develop an intuitive operator interface for adjusting the Mini Flexapod.

Keywords
Tooling
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-63184 (URN)978-91-633-6006-0 (ISBN)
Conference
SPS'09
Projects
KooFix
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2010-12-30
Jonsson, M. & Ossbahr, G. (2009). Aspects of reconfigurable and flexible fixtures. In: Proceedings for the 3rd International Conference on Changeable, Agile, Reconfigurable and Virtual Production. Paper presented at CARV2009.
Open this publication in new window or tab >>Aspects of reconfigurable and flexible fixtures
2009 (English)In: Proceedings for the 3rd International Conference on Changeable, Agile, Reconfigurable and Virtual Production, 2009Conference paper, Published paper (Refereed)
Keywords
Tooling
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-63181 (URN)
Conference
CARV2009
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2010-12-30
Jonsson, M. & Ossbahr, G. (2008). Coordinate Controlled Fixturing for Affordable Reconfigurable Tooling. In: Proceedings of 2nd CIRP Conference on Assembly Technologies and Systems. Paper presented at CATS 2008.
Open this publication in new window or tab >>Coordinate Controlled Fixturing for Affordable Reconfigurable Tooling
2008 (English)In: Proceedings of 2nd CIRP Conference on Assembly Technologies and Systems, 2008Conference paper, Published paper (Refereed)
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:liu:diva-63185 (URN)
Conference
CATS 2008
Projects
KooFix
Available from: 2010-12-13 Created: 2010-12-13 Last updated: 2010-12-30
Kihlman, H., Ossbahr, G., Engström, M. & Anderson, J. (2004). Low-cost automation for aircraft assembly. In: . Paper presented at SAE 2004 Aerospace Manufacturing & Automated Fastening Conference & Exhibition, September 21th 2004, St Louis, Missouri, United States.
Open this publication in new window or tab >>Low-cost automation for aircraft assembly
2004 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper solution for low-cost automation of aircraft assembly is presented. The concept of this development is closely related to "Lean Automation", which in this case concerns the use of modern standard equipment such as standard robots, PC-computers and a newlydeveloped spatial sensor system for prec1s1on measurements of positions. The robot is used to perform reconfiguration of tooling modules that arepossible to be configured/reconfigured in six degrees of freedom. A prototype developed as the result of an EU-project called ADFAST* has been evaluated at Linköping University in Sweden. Technical functionality is reported where the robot manages to configure the flexible tooling modules to a total error bellow 50 μm. This paper presents the resu~s on the portion of the project addressing robot, metrology system and tooling.

National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22547 (URN)10.4271/2004-01-2830 (DOI)1810 (Local ID)1810 (Archive number)1810 (OAI)
Conference
SAE 2004 Aerospace Manufacturing & Automated Fastening Conference & Exhibition, September 21th 2004, St Louis, Missouri, United States
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2012-11-29
Johansson, S., Ossbahr, G. & Harris, T. (2002). Study of the Inluence of Drilling Method and Hole quality on Static Strength and Fatigue Life of Carbon Fiber Reinforced Plastic Aircraft Material.
Open this publication in new window or tab >>Study of the Inluence of Drilling Method and Hole quality on Static Strength and Fatigue Life of Carbon Fiber Reinforced Plastic Aircraft Material
2002 (English)Report (Other academic)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-30033 (URN)15486 (Local ID)15486 (Archive number)15486 (OAI)
Available from: 2009-10-09 Created: 2009-10-09
Comstock, M. & Ossbahr, G. (2000). Hyper-flexibility: a concept for a new dimension in system variability. CIRP - Journal of Manufacturing Systems, 31, 425
Open this publication in new window or tab >>Hyper-flexibility: a concept for a new dimension in system variability
2000 (English)In: CIRP - Journal of Manufacturing Systems, Vol. 31, p. 425-Article in journal (Other academic) Published
Abstract [en]

In this paper, a common for the evolving, multi-dimensional concept called 'hyper-dimensional' is proposed. The purpose of the paper is foremost to generate a discussion concerning advanced flexibility to meet today's advanced challenges, but also to present a working proposal for a common definition to the manufacturing community. In the paper, current manufacturing flexibility theory is reviewed, the origins and current usage of hyper-flexibility ate presented, and a common definition addressing several manufacturing flexibility dimensions is developed. The relation of the new concept to the manufacturing strategy of mass customization is also highlighted.

Keywords
flexibility, automatic, assembly
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-35219 (URN)25785 (Local ID)25785 (Archive number)25785 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-01-24
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