Objective
The DUNE project developed piezo-driven modules for translation and rotation with a hybrid position, speed, and force control. They were combined in a two-dimensional planar stage with a stroke of 100 mm. In the four remaining degrees-of-freedom, the stage can be positioned over a short stroke. The stage represents a completely new drive concept where drive and bearing are combined and where two planar motions are integrated.
The stage has excellent dynamic properties making it actively stiff and controllable to 100 Hz. The stage has a positioning resolution down to 10 nm. The passive stiffness of the stage is in the order of 200 N/µm. The active stiffness, for disturbing forces having a frequency content smaller than 50 Hz is 450 N/µm. Note that the above given figures depend on design parameters of the positioning system. These design parameters can be altered to meet the specific needs of a given application. The prototype system was tested under realistic loads. Cutting forces previously recorded on an ELID ductile grinding experimental set-up are applied through shakers on the system. The position deviation of the stage under influence of the disturbance forces proves to lie within 20 nm, which corresponds to the proposed specifications. It is the aim to continue this research after the DUNE project in order to come to an industrial ELID ductile grinding machine.
The DUNE project also developed a high-speed spindle for ductile material removal. The grinding wheel has a diameter of 100 mm and a spindle rotational speed of 100 000 rpm can be reached. This allows cutting speeds up to 500 m/s. With this spindle, a new concept for ductile material removal, called High Speed Chipping (HGA), has been studied. While material removal (partially in ductile state) has been obtained, the process requires further investigation to gain a full understanding of the material removal process. The project also developed a design for a hydrostatic slide with a new kind of structured bearing pad to be combined with the high speed chipping process. This slide can be an alternative for the piezo-driven stage described above, however offering only the stiffness and not the nano-positioning capabilities.
Objectives and content
For the finishing of many industrial products additional
polishing is needed to obtain minimal surface roughness
and to get rid of sub-surface damage. Polishing is a
time consuming/ expensive process, often introducing
intolerable workpiece shape inaccuracies.
Recently, very useful new grinding methods, like
Electrolytic In-process Dressing grinding and High need
Chipping (HSC) for material removal have become available
which potentially combine an accurate surface shape
control with high removal rates, high surface quality,
and no sub-surface damage. These new grinding methods
feature no loading of the grinding tool and neither
burning of the workpiece. However, they require a (highspeed) rotating abrasive tool. Ductile grinding can be
obtained for all kinds of materials such as metal, glass,
and ceramics. The conditions for ductile grinding
require sub-micron-tracking control of the movement of
the rotating tool in all directions relative to the
workpiece. Existing grinding machines are not accurate
and stiff enough. To be able to make use of the
advantages for the ductile grinding methods, a new ultra
stiff actively controlled nano-positioning system for HSC
and ELID grinding has to be developed, eliminating
backlash, stick-slip, and rolling resistance.
The project will develop piezo-driven modules for
translation and rotation with a hybrid position, speed,
and force control. The HSC process will be further
improved and tested on the developed positioning system.
Thanks to the sub-micron accuracy and the infinite active
stiffness it will be possible to replace the widely used
polishing process by ductile grinding.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- engineering and technology materials engineering amorphous solids
- medical and health sciences basic medicine neurology stroke
- engineering and technology materials engineering ceramics
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Keywords
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Project’s keywords as indicated by the project coordinator. Not to be confused with the EuroSciVoc taxonomy (Fields of science)
Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
3001 HEVERLEE
Belgium
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.