JP2837772B2 - Manufacturing method of honeycomb panel and laser processing head for welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a honeycomb panel made of a metal material such as stainless steel or titanium, and a laser processing head used for welding the honeycomb panel.

[0002]

2. Description of the Related Art Conventionally, a face sheet and a honeycomb core are joined by electric resistance welding or an adhesive. The electric resistance welding is disclosed in JP-A-62-94343. According to this, an electrode bar 90 having a pair of electrode strips 92 and 94 extending as shown in FIG. 5A is prepared, and the core strip 96 is moved so that the flange portions 30 and 32 thereof are outside the electrode strip. On the electrode strip.

[0003] Next, the electrode strip and the core strip mounted thereon are connected to a pair of face sheets 98, 1.
00 and form a nest like the core strip 102 as shown in FIG. 5 (B). Then, a current is caused to flow through the electrode wheel 104, and the core strip 96 is attached to the face sheet 9.
8. Weld to 100. After that, the top of the core strip 96 is connected to the node welder 106 shown in FIG.
It is welded to the valley of the core strip 102 already joined.

[0004] In summary, first, the core strip and the face sheet are joined, and then the cores are joined together. This is repeated to manufacture a honeycomb panel. In this case, at the time of joining the face sheet and the honeycomb core, the two face sheets must be opened in an arcuate shape in the direction of the entrance of the electrode. To that end, it is assumed that the thickness of the facesheet will be at most 1 mm. There is also a method of using a honeycomb core having no flange and joining the face sheet to the honeycomb core with an adhesive.

[0005]

SUMMARY OF THE INVENTION As mentioned above,
In the conventional welding of the honeycomb core and the face sheet by the electric resistance welding method, the face sheet must be bent into an arcuate shape in the direction of the entrance of the electrode, and for this purpose, the thickness of the face sheet is 1 mm or less. There is a need. Then, there is a step of welding the core strips one by one to the face sheet, and a step of welding the honeycomb cores to each other. In each welding, the electrodes must be brought into contact with each other, which is very troublesome. Furthermore, since electric resistance welding is performed by sandwiching the flange portion of the face sheet and the honeycomb core between the electrode wheel and the electrode bar, deformation is easily generated in the welded portion, and undulations and large welding marks remain on the face sheet surface Would.

If the thickness of the face sheet is 1 mm or more, the face sheet cannot be bent in the direction of the electrode entrance due to high bending rigidity, or does not return to the original state even after bending, so that the honeycomb panel has a large thickness. Cannot be manufactured. Further, during welding, the positional relationship between the shape of the honeycomb and the welding head is not constant, and a defect occurs in welding. Therefore, it is necessary to control the welding head along the welding line. However, it is difficult to control the processing head inside the honeycomb core. When the face sheet and the honeycomb core are joined by an adhesive instead of welding, generation of undulation is eliminated in the face sheet, but there is a disadvantage that heat resistance is inferior to that of the joining method by welding.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem by forming a laser beam in a space surrounded by a honeycomb core and a face sheet without bending the face sheet into a bow shape at the time of welding. The space is scanned by a laser processing head consisting of a fiber condensing optical system and a bending optical system equipped with a balancer, and a laser beam is irradiated from the inside of the face sheet. As described above, there is provided a method for manufacturing a honeycomb panel characterized in that welding can be performed at a high speed because the electrodes are not brought into contact with each other, and that swelling and welding marks are not generated on the surface of the face sheet by laser welding from inside the face sheet.

[0008]

FIG . 1 is a diagram illustrating the manufacture of a honeycomb core according to the present invention.
FIG. 2 is an explanatory view of a laser processing head used in the present invention.
It is. The present invention relates to a honeycomb core 2 having a trapezoidal waveform.
Honeycomb pad consisting of two face sheets 1 sandwiching it
In the manufacturing method of the tunnel, the laser beam
Is focused by the condenser lens 13 and emitted to the other end of the tube.
A bar focusing optical system 4 and a tube of the fiber focusing optical system 4
The other end of the fiber focusing optical system 4 is
Set by rotating the axis of the cylinder to the desired rotation angle with the axis of rotation as the rotation axis
Folding is possible by the built-in bending mirror 14
The fiber condensing optical system 4 changes the direction of the emitted laser light.
And a bending optical system 5 for irradiating the outside
Using the processing head, the trapezoidal side wall surface of the honeycomb core 2
And the laser in a space surrounded by
Supporting tool 7 provided with processing head on outer surface of laser processing head
To the honeycomb core side wall and the face sheet
Insert and irradiate the laser beam 8 to the outside
The rotation angle of the bending optical system 5 is set as
The working head is slid from one end of the
The base sheet 1 and the honeycomb core 2 inside the face sheet
Honeycomb panel characterized by performing laser welding from
This is the manufacturing method of the file.

During welding, the positional relationship between the shape of the honeycomb and the laser processing head is not constant, and a defect occurs in welding. Therefore, it is necessary to control the welding head along the welding line. However, since it is difficult to control the processing head inside the honeycomb core, automatic laser beam irradiation is performed.

The fiber focusing optical system 4 and the bending optical system 5 shown in FIG. 2 are coupled by a free rotation mechanism 16 such as a bearing. The balancer 15 such as lead having a high specific gravity is set at an arbitrary position in the circumferential direction of the bending optical system 5 behind the bending mirror 14 of the bending optical system 5. The irradiation position of the laser beam is determined by the setting position of the balancer 15.

That is, in FIG. 3A, an angle formed by the center line BB ′ of the balancer 15 and the vertical line MM ′ of the bending mirror 14 is defined as θ. At this time, BB '
Corresponds to the direction of gravity, and MM ′ is the laser emission port 1 in FIG.
7 coincides with the central axis. The irradiation position is determined by making this θ variable. Thus, the laser irradiation direction can be freely set in the circumferential direction of the laser head 3. FIG. 3B shows a case where the balancer 15 is attached at θ = 0 °.
Welding can be performed by tilting the panel so that the welding line is directly below the direction of gravity. In addition, when welding is performed without tilting the panel, the balancer 15 may be moved to a previously calculated position where the inclination in the welding line direction and the gravity direction can be calculated with the center axis of the laser head 3 as the origin. .

FIG. 4A shows a case where a laser beam is applied to a joint groove formed by the oblique side of a trapezoidal honeycomb core and a face sheet to perform welding.
(b) shows a trapezoidal honeycomb core 2 and a face sheet 1
Lap welding is performed by irradiating a laser beam from the side of the honeycomb core to a surface contacting with the surface.

FIG. 2 shows a laser head 3, which comprises a fiber focusing optical system 4 and a bending optical system 5. The fiber condensing optical system 4 uses a collimating lens 12 for converting a laser beam having a large spread emitted from the fiber exit port into a parallel beam, and a condensing lens 13 having a focal length of 50 mm or more. 3mm ~ 0.
The depth of focus can be 5 mm and the depth of focus can be 1 mm or more.

In addition, the fiber condensing optical system 4 has a plurality of rollers 6 mounted on a roller support 7 with springs, which are mounted so as to conform to the shape surrounded by the honeycomb core 2 and the face sheet 1. When the laser head 3 is moved, the roller support 7 absorbs the displacement, and the focal length of the laser beam focused by the focusing lens 13 and the distance from the focusing lens 13 to the irradiation point are always kept constant. .

As described above, in the method for manufacturing a honeycomb panel including a trapezoidal honeycomb core and two face sheets sandwiching the honeycomb core, the space surrounded by the honeycomb core and the face sheet is irradiated in the direction of gravity. By inserting a laser head that can set the angle arbitrarily, scanning the welding position in the direction of the welding line with automatic control, and performing laser welding from the inside of the face sheet, the honeycomb panel with no undulation or welding marks on the face sheet surface Can be manufactured.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A honeycomb core has a trapezoidal continuous waveform and has a trapezoidal portion having a size of 5 mm on the side that contacts the face sheet, 35 mm on the bottom side of the trapezoid that does not contact the face sheet, and 40 mm in height. The honeycomb core has a finished shape of 300 mm in length and 300 mm in width, and has a thickness of 0.3 mm. The two face sheets sandwiching the honeycomb core are 300 mm long,
It is a 300 mm wide flat plate and its thickness is 3 mm. Stainless steel is used for the material of the honeycomb core and the face sheet.

The laser irradiation is performed on the trapezoidal 5 mm side where the honeycomb core and the face sheet are in contact with each other, from the center of the trapezoid to the side, and further, the oblique side of the trapezoid and the groove formed by the face sheet. Laser welding toward. The laser irradiation conditions at that time were Nd-Y
Using the CW oscillation of the AG laser, the focusing diameter is set to 0.3 mm by the combination of the collimating lens and the focusing lens.
The output is 240 W, and the moving speed of the fiber focusing optical system is 1 m / min.

The shape of the completed honeycomb panel is 300 vertical.
mm, 300 mm in width and 46 mm in height, the surface of the panel has no undulation, and no welding marks are observed. When a compression test is performed to evaluate the mechanical properties of the honeycomb panel, the maximum withstand load is about 40 kg / mm ² , and peeling from the face sheet is not recognized.

[0019]

As described above, according to the present invention, a fiber focusing optical system and a bending optical system with a balancer are provided so that a laser beam can be irradiated from the inside of the face sheet to the joint between the honeycomb core and the face sheet. By using a laser processing head consisting of the following, it can be manufactured more stably at a higher speed than conventional electric resistance welding, and can be used even in high temperature conditions, without undulating or welding marks on the face sheet surface Thus, a strong honeycomb panel can be provided. Also, since the face sheet and the honeycomb core can be joined by slightly melting the face sheet, as the face sheet becomes thicker,
Since the thermal effect is small, it is very effective against thermal distortion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a view showing a laser head used in the present invention in detail, and FIG. 3a is a center line BB ′ of a balancer and a bending mirror. Vertical line M-
FIG. 3b is a diagram showing one welding method of the present invention, in which the panel is inclined, and FIG. 4a is a diagram showing the present invention used for groove welding of a honeycomb core and a face sheet. FIG. 4B shows an example in which the position of the balancer is changed. FIG. 4B is a diagram in which the present invention is used for overlapping welding of the honeycomb core and the face sheet. FIG. 5B shows an example in which the position of the balancer is changed. It is a figure showing a method.

[Explanation of symbols]

1: face sheet, 2: honeycomb core, 3: laser head, 4: fiber focusing optics, 5: bending optics, 6: roller, 7: roller support,
8: laser beam, 9: laser oscillator, 10: fiber, 11: drive unit, 12: collimating lens,
13: condenser lens, 14: bending mirror,
15: balancer, 16: free rotation mechanism, 17: laser emission port, 90: electrode bar, 92: electrode strip, 94: electrode strip, 96: core strip, 98: face sheet, 100: face sheet, 102: core strip , 104: electrode wheel, 1
06: Node welder.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsushi Sugihashi 5-10-1 Fuchinobe, Sagamihara City, Kanagawa Prefecture Nippon Steel Corporation Electronics Research Laboratory (58) Field surveyed (Int.Cl. ⁶ , DB name) B23K 26/00-26/06 B32B 3/12

Claims (3)

(57) [Claims] 1. A honeycomb core and a method for manufacturing a honeycomb panel comprising two sheets of face sheets sandwiching it trapezoidal waveform, the condenser lens of the laser light incident on one end of the tube
Fiber condensing optics that condenses light and emits light to the other end of the cylinder
System and a balancer at the other end of the tube of the fiber focusing optical system.
The axis of rotation of the tube of the fiber focusing optical system
It is arranged to be settable by rotating to the desired rotation angle and built-in
Fiber focusing optical system emits light by bending mirror
Irradiates the outside by changing the direction of the laser beam
Using a laser processing head with
Framed by the trapezoidal side walls of the mucoa and the face sheet
The laser processing head outside the laser processing head
The support provided on the surface is
The laser beam to be radiated to the outside is melted.
Set the rotation angle of the bending optical system so that it faces the joint.
And place the laser head in close contact with the space to
Slide from end to end, face sheet and honeycomb core
And performing laser welding from the inside of the face sheet. 2. A laser head comprising a fiber condensing optical system and a bending optical system having a balancer, wherein the coupling between the two optical systems has a free rotation structure, and the center line BB 'of the balancer and the bending mirror are provided. 2. The honeycomb panel according to claim 1, wherein an irradiation angle is determined with respect to the direction of gravity by setting an angle θ formed by the vertical line MM ′ and the irradiation position can be arbitrarily set. Laser processing head for welding. 3. The laser processing head according to claim 1 or 2.
Using a condenser lens with a focal length of 50 mm or more and a laser focusing diameter of 0.3 mm to 0.5 mm and a focal depth of 1 m
m or more, the laser beam head consisting of the fiber condensing optical system and the bending optical system is inserted into the space surrounded by the honeycomb core and the face sheet, and the tolerance of irradiation blur when scanning is reduced. Manufacturing method of the honeycomb panel.