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1. WO1997015419 - METHOD AND APPARATUS FOR MAKING HOLES IN A WORKPIECE

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[ EN ]

Claims

1. A method of making (10) a workpiece (14) having a plurality of holes (12) defined therein, said plurality of holes (12) defining a specific flow at a specific flow condition, said workpiece (14) being defined by a first surface (16) and a second surface (18) , said second surface (18) being spaced from said first surface (16) , said plurality of holes (12) extending between said first surface (16) and said second surface (18) , said method of making (10) the plurality of holes (12) including the steps of:
a) forming a first portion (70) of said
plurality of holes (12) with a forming
device (72) , said first portion (70) of said plurality of holes (12) having a first
preestablished hole cross-sectional area
being defined by a predetermined flow
characteristic value of the first
preestablished hole cross-sectional area at said specific flow condition;
b) forming a cavity (56) about one of said
first surface (16) and said second surface
(18) ;
c) positioning a flow establishing device (58) in communication with said cavity (56) ;
d) positioning a flow monitoring device (62) in operative relationship with said flow
establishing device (58) ;
e) actuating said flow establishing device (58) and establishing a flow through said first
portion (70) of said plurality of holes
(12) , said flow being directed from said one of said first surface (16) and said second
surface (18) ;
f) monitoring said flow;

g) comparing said flow with the predetermined
flow characteristic value;
h) determining a flow requirement of a second
portion (80) of said plurality of holes (12) based on a predetermined flow characteristic value of said first and second portions
(70,80) of said plurality of holes (12) and the measured flow of said first portion (70) of said plurality of holes (12) :
i) conforming said forming device (72) to a
second predetermined hole cross-sectional
area, said second predetermined hole cross- sectional area being determined from step h;
and
j) forming the second portion (80) of said
plurality of holes (12) having said second
predetermined hole cross-sectional area.

2. The method of making (10) a workpiece (14) having a plurality of holes (12) defined therein of claim 1 wherein said steps further include:
a) actuating said flow establishing device (58) creating an accumulative flow through said
first and second portions (70,80) of said
plurality of holes (12) , said accumulative
flow being directed from said one of said
first surface (16) and said second surface
(18);
b) monitoring said flow;
c) comparing said flow with the predetermined
flow characteristic value of said first and second portions (70,80) of said plurality of holes (12) ;
d) determining a flow requirement of a third
portion (90) of said plurality of holes (12) based on a predetermined flow characteristic value of said first, second and third portions (70,80,90) of said plurality of
holes (12) and the measured flow of said
first and second portions (70,80) of said
plurality of holes (12) :
e) conforming said forming device (72) to a
third predetermined hole cross-sectional
area, said third predetermined hole cross- sectional area being determined from step d;
and
f) forming the third portion (90) of said
plurality of holes (12).

3. The method of making (10) a workpiece (14) having a plurality of holes (12) defined therein of claim 2 wherein said steps further include:
a) actuating said flow establishing device (58) creating an other accumulative flow through a combined total of previously made portions (70,80,90) of said plurality of holes (12), said another accumulative flow being
directed from said one of said first surface

(16) and said second surface (18) ;
b) monitoring said flow;
c) comparing said flow with an other
predetermined flow characteristic value;
d) determining a flow requirement of an other
portion (100) of said plurality of holes
(12) based on a predetermined flow
characteristic value of said combined total of previously made portions (70,80,90) and
the other portion (100) of said plurality of holes (12) and the measured flow of said
combined total of previously made portions
(70,80,90) of said plurality of holes (12): e) conforming said forming device (72) to an
other predetermined hole cross-sectional
area, said other predetermined hole cross- sectional area being determined from step d;
and
f) forming the other portion (100) of said
plurality of holes (12).

4. An apparatus (10) for making a workpiece

(14) having a plurality of holes (12) defined therein, said plurality of holes (12) defining a specific flow at a specific flow condition, said workpiece (14) being defined by a first surface (16) and a second surface (18) , said second surface (18) being spaced from said first surface (16) , said plurality of holes (12) extending between said first surface (16) and said second surface (18) , said apparatus for making (10) the plurality of holes (12) including:
a sealing device (32) being operatively connected to the workpiece (14) and forming a cavity (56) between the sealing device (32) and the workpiece (14);
a forming device (72) for forming a first portion (70) of said plurality of holes (12) , said first portion (70) of said plurality of holes (12) having a first preestablished hole cross-sectional area being defined by a predetermined flow characteristic value of the first preestablished hole cross-sectional area at said specific flow condition;
a flow establishing device (58) being positioned in communication with said cavity (56) ;

a flow monitoring device (62) being operatively interposed the flow establishing device (58) and the workpiece (14) ;
a computer apparatus (76) being operatively connected to said flow establishing device (58) , said flow monitoring device (62) and said forming device

(72) , said computer apparatus (76) actuating said flow establishing device (58) and establishing a flow through said first portion (70) of said plurality of holes (12) , said flow being directed from said one of said first surface (16) and said second surface (18) and said computer apparatus (76) interpreting a signal from the flow monitoring device (62) ;
said computer apparatus (76) interpreting said signals to compare said flow with the predetermined flow characteristic value and determine a flow
requirement of a second portion (80) of said plurality of holes (12) based on an accumulative predetermined flow characteristic value of said first and second portions (70,80) of said plurality of holes (12) and the measured flow of said first portion (70) of said plurality of holes (12) :
said computer apparatus (76) conforming said forming device (72) to a second predetermined hole cross-sectional area, said second predetermined hole cross-sectional area being determined by said computer apparatus (76) ; and
said forming device (72) , after being conformed, forming the second portion (80) of said plurality of holes (12) having said second predetermined hole cross-sectional area.

5. The apparatus (10) for making a workpiece (14) of claim 4 wherein said sealing device (32) is removably connected to the workpiece (14) .

6. The apparatus (10) for making a workpiece (14) of claim 4 wherein said forming device (72) is a laser drilling device (72) .

7. The apparatus (10) for making a workpiece (14) of claim 4 wherein said flow establishing device

(58) is a air compressor.

8. The apparatus (10) for making a workpiece (14) of claim 4 wherein said flow establishing device (58) is a vacuum forming device.

9. The apparatus (10) for making a workpiece (14) of claim 4 wherein said computer apparatus (76) s a stationary computer.

10. The apparatus (10) for making a workpiece (14) of claim 4 wherein said computer apparatus (76) s a portable computer.