Abrading – Abrading process
Patent
1998-03-23
2000-01-18
Scherbel, David A.
Abrading
Abrading process
451362, B24B 700
Patent
active
060153342
DESCRIPTION:
BRIEF SUMMARY
AREA OF APPLICATION OF THE INVENTION
This invention concerns a method for the deburring of items, particularly metal items which are encumbered with sharp edges or burrs after punching, clipping, moulding and/or machining operations.
The invention also concerns the use of the method for the deburring of ribs for aircraft wings, plate items and the like.
TECHNICAL BACKGROUND OF THE INVENTION
Deburring is a problem not only in the production of innumerable items of metal, but also in the production of items of other materials, for example items of plastic, where the items can have flashed edges or projections.
When the deburring of items of metal is involved, it is often a great advantage if a uniform chamfer can be produced on the contour of the item.
In addition to the manual deburring of the individual items by a worker using a file, there are also various technologies for deburring during mass production, such as electrolytic deburring and vibration in an abrasive material, grinding, sandblasting, rinsing with various materials and high-pressure flushing with abrasive additives.
The above-mentioned methods of deburring during mass production have a number of disadvantages, of which the following can be mentioned: for example at a circular hole, where different chamfer radii can appear along the edge of the hole.
From U.S. Pat. No. 5,468,173 there is known a machine for the deburring of metal items, said machine comprising two sets of deburring heads each with four deburring rollers provided with abrasive leaves which extend radially outwards from a retaining cylinder. All of the deburring rollers are rotated and turned in the same direction across the item which is to be deburred.
However, this machine is not suitable for deburring in corners and narrow passages, the reason being that the breadth of the deburring leaves sets a limit for the breadth of the opening which can be processed.
Furthermore, the relative stiffness of the leaves sets a limit for their possibility of adjusting themselves to different contours and edges.
Despite the many different methods and machines for deburring, many deburring tasks must still be carried out manually, in that this is made necessary by the above-mentioned disadvantages and the demand concerning uniform chamfer radii along the multifarious contours of the items.
Manual deburring is, however, time-consuming and therefore costly in mass production. Moreover, scratches often appear in the deburred edges, which scratches can contribute towards the formation of cracks, which in turn can lead to fractures in the items.
In the aviation industry, there thus exits a problem in the manufacture, for example, of ribs for aircraft wings or similar items. These ribs are made of a large metal item which is machined to the precise configuration. When the ribs are thus brought down to their final dimensions, the burrs which result from the machining must be removed during simultaneous chamfering with quite precise chamfer radii of the edges at holes and outer edges. These chamfers shall not only have a certain radius, but the chamfers must also be completely free of scratches or marks after the deburring, in that such scratches or marks can lead to the formation of cracks as a consequence of vibrations in the finished ribs when they are mounted in an aircraft wing or a similar place.
There is thus a need for being able to carry out the deburring of metal items without this giving rise to scratches or cracks in the deburred edges of the items, in that at the same time as the deburring there shall also be produced chamfers with uniform radii on the contours of the items.
Where the items are to he given subsequent surface treatment, it is desirable that the deburring is effected with uniform contours, in that it is hereby ensured that the surface coating, such as paint, can be applied in a layer of the desired thickness.
It is therefore the object of the present invention to provide a method for the deburring of metal items which are encumbered with sharp edges or burrs after pun
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patent: 3597881 (1971-08-01), Olton
patent: 4646473 (1987-03-01), Hundebol
patent: 4646479 (1987-03-01), Walker et al.
patent: 4704823 (1987-11-01), Steinback
patent: 4835913 (1989-06-01), Blanton
patent: 5105583 (1992-04-01), Hammond et al.
patent: 5125192 (1992-06-01), Welsch
patent: 5291689 (1994-03-01), Hundebol
patent: 5441440 (1995-08-01), Hundebol
patent: 5468173 (1995-11-01), Winton, III
patent: 5531636 (1996-07-01), Bissen
patent: 5601481 (1997-02-01), Hundebol
patent: 5649851 (1997-07-01), Boucherie
Revised Search Report WO 98/05472 filed Feb.12, 1998.
HH Patent A/S
Ojini Anthony
Scherbel David A.
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