Geometrical instruments – Gauge – With support for gauged article
Reexamination Certificate
2002-02-21
2003-05-13
Bennett, G. Bradley (Department: 2859)
Geometrical instruments
Gauge
With support for gauged article
C033S645000, C269S909000
Reexamination Certificate
active
06560890
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates generally to a part fixture for a laser drilling operation. More specifically, the present invention is directed to a fixture for turbine nozzles that does not interfere with a laser drilling operation on the turbine nozzle.
In general manufacturing of turbine nozzles and other parts, the fixtures used for manufacturing the parts have fixed locators to position the part in the proper orientation for machining. The fixed locators are usually positioned against the part's datums. The datums of the part are preset locations or points on the part that, when support is applied to those locations, prevent the part from translating along the three axes of a three axis orthogonal coordinate system (e.g. x, y, and z axes) and prevent the part from rotating about each of the three axes. Generally, a three-dimensional object will require 6 datum points. Using the datums of a part positions the part into a known position, which can then be used for a subsequent machining operation or for an assembly operation.
Generally, the vanes of a turbine nozzle have 4 of their 6 datum points located on the leading edge of the vane.
FIGS. 1 and 2
illustrate a vane
100
of a turbine nozzle and the corresponding datum points
102
-
112
for the vane
100
. As can be seen from
FIGS. 1 and 2
, datum points
102
-
108
are located on the leading edge of the vane
100
. During the manufacturing of a vane for a turbine nozzle, it is necessary to laser drill cooling holes into the leading edge of the vane. To be able to laser drill cooling holes into the leading edge of a vane, the vane is generally positioned into a fixture and clamped at its datum points, as discussed above. However, the clamping of the part at its datum points by the fixture can interfere with the laser drilling operation, if holes are to be laser drilled at or in the vicinity of the datum points.
FIGS. 3 and 4
illustrate a prior art fixture
300
used for laser drilling holes in a vane
100
. The vane
100
is placed into a base
302
and a plate
304
is attached to the base
302
to hold the vane
100
in the fixture
300
. The plate
304
has 4 fixed datum locators
306
that are used in positioning the vane
100
and locating the leading edge of the vane
100
. The fixture
300
utilizes several screws
308
to hold the part or vane
100
against the leading edge locators
306
. These screws
308
are a form of an adjustable work support. Once the part
100
is secured against the locators
306
, screw clamps
310
are used to hold the part
100
against the screws or work supports
308
of the fixture
300
. The clamps
310
are used to ensure that there is not any translation or rotation of the part
100
. An iterative process of adjusting the work supports
308
and the clamps
310
is used to ensure that the vane
100
is seated against the locators
306
. Once the part
100
is properly located and clamped, the plate
304
containing the leading edge locators
306
is removed permitting laser access to the leading edge of the vane
100
. This process of iterative adjustment of the screws
308
and clamps
310
to position the vane
100
is time consuming, prone to part miss-load and ergonomically unfriendly.
Therefore what is needed is a fixture where parts can be easily and accurately loaded into an appropriate position for laser drilling and then held in the appropriate position without interfering with the laser drilling operation.
SUMMARY OF THE INVENTION
One embodiment of the present invention is directed to a fixture to align and hold a part for a machining operation. The fixture includes a base assembly and a locator assembly. The base assembly is configured to hold a part for a machining operation. The locator assembly has a first end pivotably connected to the base assembly and a second end opposite the first end. The second end of the locator assembly is pivotable between an engaged position adjacent the base assembly and a disengaged position opposite the base assembly. The locator assembly includes at least one part locator to align a part for a machining operation. The locator assembly is configured to position a part held in the base assembly against the at least one part locator to align a part in the base assembly for a machining operation in response to the second end of the locator assembly being in the engaged position.
Another embodiment of the present invention is directed to a fixture to align and hold a vane for a laser drilling operation. The fixture includes means for holding a vane for a laser drilling operation and a locator arm. The locator arm is connected to the means for holding a vane at one end and is detachably connected to the means for holding a vane at the other end. The locator arm is pivotable about the end connected to the means for holding a vane to move the other end to detachably connect to the means for holding a vane. The fixture also includes at least one locator. The at least one locator is disposed on one of the means for holding a vane and the locator arm. Finally, the means for holding a vane and the locator arm are configured to position a vane against the at least one locator in response to the second end of the locator arm being connected to the means for holding a vane such that a vane is in a predetermined alignment position for a laser drilling operation.
One advantage of the present invention is that it is easier for an operator to load a part into the fixture.
Another advantage of the present invention is that parts can be accurately loaded into the fixture in less time and with less effort.
Other features and advantages of the present invention will be apparent from the following more detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.
REFERENCES:
patent: 4032743 (1977-06-01), Erbach et al.
patent: 4298784 (1981-11-01), Schmall
patent: 4322887 (1982-04-01), Burton
patent: 4374459 (1983-02-01), Burton
patent: 4431899 (1984-02-01), Racki et al.
patent: 4465919 (1984-08-01), Roder
patent: 4485453 (1984-11-01), Taylor
patent: 4694139 (1987-09-01), Roder
patent: 4794222 (1988-12-01), Funayama et al.
patent: 4825032 (1989-04-01), Duncan
patent: 5083006 (1992-01-01), Stroud
patent: 5174715 (1992-12-01), Martin
patent: 5182855 (1993-02-01), Martin
patent: 5231471 (1993-07-01), Torigoe
patent: 5544873 (1996-08-01), Vickers et al.
patent: 5719373 (1998-02-01), Snyder et al.
patent: 6114653 (2000-09-01), Gustafson
patent: 6130405 (2000-10-01), Loringer
patent: 6463979 (2002-10-01), Sano et al.
Byrnes Brett Wayne
Madge James Henry
Bennett G. Bradley
General Electric Company
McNees Wallace & Nurick
VG Ramaevemy
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