FIELD OF INVENTION
The present invention relates to riveting at dividing ring of blades of bladed
turbine disc. More particularly, the present invention relates to a fixture for
easy and quick riveting between joints of dividing rings of blades adaptable to
bladed turbine rotor disc.
BACKGROUND OF THE INVENTION
At present riveting between joints of dividing rings of blades assembled on
turbine disc is done using a fixture as shown in fig. 1 (a) and 1 (b). For
riveting, the fixture is fitted on the dividing ring without item no. 3 (lock nut)
and 4(screw) as shown in fig.l(a). Item no.5 (pin) is located on the back of
the rivet. After locating item no.5, item no.4 (screw) is screwed in item
no.2(body) and when it touches the dividing ring, lock nut(3) is screwed on
screw(4) and tightened. The fixture is held by hand through handle (1) and
riveting is done.
This takes a lot of time. Approach to the point of riveting is not easy. Fixture
is to be located/set again and again.
OBJECT OF THE INVENTION
It is therefore an object of the present invention to provide a fixture for easy
and quick riveting between joints of dividing rings of blades which eliminates
the disadvantage of the prior art.
Another object of the present invention is to provide a fixture for easy and
quick riveting between joints of dividing rings of blades which will reduce the
setting time.

Yet another object of the present invention is to provide a fixture for easy and
quick riveting between joints of dividing rings of blades which provides easy
approach to riveting.
A further object of the present invention is to provide a fixture for easy and
quick riveting between joints of dividing rings of blades which provides easy
location and setting of fixture.
A still further object of the present invention is to provide a fixture for easy
and quick riveting between joints of dividing rings of blades which increases
productivity.
SUMMARY OF THE INVENTION
Accordingly, there is provided a fixture for riveting ( fig.2(a) & 2(b) )
comprising a setting piece(l) having a slot S1 for setting on wire fitted on
blade and a threaded hole H1 for fitting support(2), two threaded holes(H2)
and a third hole(H3) for fitting holding clamp(4), a support(2) fixable on
setting piece(l) via first threaded hole(H1), a holding clamp(4) fixable to
setting piece(l) by a pair of second hole(H2) and a third hole H3 for welding,
a setting clamp(6) for holding the fixture fixable on holding damp(4) by a slot
S3, a hardened pin(7) fixable to support(2) via hole H4. The pin(7) provides
the support to the rivet for riveting and the setting piece(l) sets the fixture at
exact location on the blades with the help of slot S1.

BRIEF DESCRIPTION OF DRAWINGS
Fig.l(a)- shows the diagram of prior art.
Fig.l(b)- shows view A' of fig.l(a) of prior art.
Fig.2(a)- shows fixture for riveting according to present invention.
Fig.2(b)- shows fixture for riveting according to an embodiment of the
present invention and is view A of fig.2(A).
Fig.3- shows the layout of setting piece, support, screw, holding clamp,
pressing screw, setting clamp and pin of present invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE
PRESENT INVENTION
Fig.2(a) shows the riveting fixture which comprises a setting piece(l) fixed on
the bladed disc on the lacing wire. A support(2) is screwed on the setting
piece(l). A holding clamp(4) is mounted on the setting piece(l) by means of
two fastening screw(3) on one part and the other part welded at hole H3. A
setting clamp(6) is inserted on holding clamp(4) through a slot S3 and
covered the top by a pressing screw(5). A insertable pin(7) is provided in
support(2).
Fig.3 shows the layout of all items.

WE CLAIM
1. A riveting fixture for easy and quick riveting between joints of dividing
rings of blades comprising of
- a setting piece(l) is provided with a plurality of threaded holes
(H, H2, H3) and one threaded hole H1 for mounting Support(2)
and a slot S1 for setting it on lacing wire of bladed disk;
- a holding clamp(4), one part is fixable on setting piece(l) by a
pair o holes H2 by means of a pair of screw(3) and a second
part hole H3 and the holding clamp is provided with a slot S3 for
fitting of setting clamp(6);
- a setting clamp(6) is inserted on slot S3 of holding clamp(4) and
fixed on setting piece(1) through slot S2 and depress
configuration D1 of setting piece (1) are placed on blades for
exact setting.
- a pin (7) which is inserted in the hole H4 of support (2);
- a pressing screw (5) is provided for fixing setting clamp(6) and
- a support (2) which is fixed to setting piece(l) through hole H1

2. The riveting fixture as claimed in claim 1 wherein pin(7) is made of
hardened alloy steel.
3. The riveting fixture as claimed in claim 1 wherein support(2) is made
of hardened steel.

Accordingly, there is provided a fixture for riveting ( fig.2(a) & 2(b) ) comprising a setting piece(1) having a slot S1 for setting on wire fitted on blade and a threaded hole H1 for fitting support(2), two threaded holes(H2)
and a third hole(H3) for fitting holding clamp(4), a support(2) fixable on setting piece(1) via first threaded hole(H1), a holding clamp(4) fixable to setting piece(1) by a pair of second hole(H2) and a third hole H3 for welding,
a setting clamp(6) for holding the fixture fixable on holding clamp(4) by a slot
S3, a hardened pin(7) fixable to support(2) via hole H4. The pin(7) provides the support to the rivet for riveting and the setting piece(1) sets the fixture at exact location on the blades with the help of slot S1.