JP2003311452A - Laser brazing method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain improvement in strength of a machining zone without causing degradation of outside appearance quality of the machining zone. <P>SOLUTION: A machining head 15 is equipped with a laser beam separating means consisting of a collimation lens 31, a beam splitter 33, bend mirrors 35, 37, and a condensing lens 39. A parallel beam 17b outgoing from the collimation lens 31 is split into two directions by the beam splitter 33 to be split laser beams 17c, 17d and reflected by the bend mirrors 35, 37 to be split parallel beams 17e, 17f. The split parallel beams 17e, 17f, after passing through the condensing lens 39, turn to convergent beams 17g, 17h and, after crossing at the focal point F, become separate laser beams 17i, 17j to be each emitted to a meltable material 19 and between respective metal plates 21, 23. Since the separate laser beams 17i, 17j are also emitted to the metal plates 21, 23, the temperature of the metal plates 21, 23 rises, with the wetting area expanded between the meltable material 19 and the respective metal plates 21, 23. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining head for taking in a laser beam, which irradiates the laser beam while moving relative to a workpiece, and a molten material for brazing to a machining site which is irradiated with the laser beam. The present invention relates to a laser brazing processing method and a processing apparatus to be supplied.

[0002]

2. Description of the Related Art As shown in FIG. 4, when two plate materials 1 and 3 serving as a base material are joined by laser brazing, the direction of supply of the molten material 5 is such that a processing head 7 moves as indicated by an arrow A. The front side in the direction is general.

[0003]

The strength of the brazed portion depends on the wetted area (contact area) between the molten material and the base material after melting, but the wettability of the melted molten material to the base material is high. In order to improve and increase the wetted area,
It is necessary to raise the temperature of the base material.

However, when the molten material is supplied from the front side in the moving direction of the processing head 7 as in the processing method shown in FIG. 4, the laser beam 9 radiated to the processed portion as shown in FIG. Since this molten material is mainly irradiated and absorbed, the amount of energy transmitted between the respective plate materials 1 and 3 as the base material, particularly to the joint portion 11, is reduced, and the temperature of the base material cannot be efficiently increased.

Therefore, as shown in FIG. 6, the melted molten material 13 does not reach the depth of the joint portion 11, and the molten material 1
The joint S between the base metal 3 and the base metal stays at the upper part of the joint 11 and does not reach the back. As a result, the wetted area becomes small and the strength of the joint decreases.

Further, in order to transfer more laser energy to the joint portion 11, a method of supplying the molten material 9 from a direction other than the front of the moving direction of the processing head 7 can be considered. Since it is not smoothly supplied to the processed part, the appearance quality of the processed part is deteriorated and the quality is deteriorated.

Therefore, an object of the present invention is to improve the strength of the processed portion without deteriorating the appearance quality of the processed portion.

[0008]

In order to achieve the above object, the invention of claim 1 is such that a machining head for taking in a laser beam irradiates the laser beam while moving relative to a work, In a laser brazing processing method of supplying a molten material for brazing to a processing portion irradiated with light, the laser light is radiated between both sides of the molten material in a state of being supplied to the processing portion and the work. This is a brazing method.

According to a second aspect of the invention, in the laser brazing method according to the first aspect of the invention, one laser beam is
Separated into two by the laser light separating means, each separated laser light separated into these two, the both sides of the molten material and the work so as to be substantially perpendicular to the relative movement direction of the processing head and the work. It is intended to be irradiated during.

According to a third aspect of the present invention, in the laser brazing method according to the second aspect of the present invention, each of the two separated laser beams is irradiated between both sides of the molten material and the work, The molten material and the work are repeatedly reflected.

A fourth aspect of the present invention is the laser brazing method according to any one of the first to third aspects,
The work is for joining two plate members to each other, and each plate member has a bent portion that bends in a direction away from an adhered portion where they are in close contact with each other, and the molten material is supplied between the bent portions. While irradiating with the laser light.

According to a fifth aspect of the present invention, the processing head that takes in the laser light irradiates the laser light while moving relative to the workpiece, and the processing material irradiated with the laser light is provided with a molten material for brazing. In a laser brazing apparatus for supplying and performing laser brazing, one laser beam taken in by the processing head is
A laser beam separating means for separating the laser beam into two is provided, and the laser beam separating means separates each of the two separated laser beams into a space between both sides of the molten material in a state of being supplied to the processing site and the work. It is configured to irradiate on.

According to a sixth aspect of the present invention, in the structure of the fifth aspect of the invention, the laser beam splitting means splits one laser beam in two directions, and two split beams split by this beam splitter. Laser light, reflecting mirror for reflecting in parallel to each other, each separated laser light reflected by this reflecting mirror, after intersecting each other in front of the molten material, further divided into two in front of it, A condensing lens for irradiating the molten material between both sides of the molten material and the work is provided.

According to a seventh aspect of the present invention, in the construction of the fifth or sixth aspect of the invention, the work is to join two plate members to each other, and the plate members are separated from each other by a close contact portion where they are in close contact with each other. The bent portion is bent in a direction, and the laser beam is irradiated while the molten material is supplied between the bent portions.

[0015]

According to the first aspect of the present invention, the laser light irradiated between the molten material and the work is only the molten material even if the molten material is supplied from the front in the relative movement direction of the machining head with respect to the work. Not only that, the workpiece is also irradiated more, but the temperature of the workpiece rises, and as a result, the wetted area of the molten material after the melting with respect to the workpiece increases, and the strength of the joint portion improves.

According to the second aspect of the invention, the two separated laser beams are applied between the molten material and the work so as to be substantially perpendicular to the relative movement direction between the processing head and the work. The laser light applied to the processed portion efficiently irradiates not only the molten material but also the work, and the temperature of the work rises. As a result, the wetted area between the molten material and the work increases, and Strength is improved. Further, since the two laser beams are obtained by separating one laser beam, only one laser oscillator is required, and the cost can be reduced as compared with the case where two laser oscillators are used.

According to the third aspect of the present invention, the two separated laser beams are repeatedly reflected between the molten material and the work, so that the absorption of the laser energy into the molten material and the work can be enhanced, and the work can be enhanced. The temperature becomes higher, the wetted area between the molten material and the work is further increased, and the strength of the joint can be further improved.

According to the fourth aspect of the invention, it is possible to increase the strength of the joint between the plate materials when the laser beam is irradiated while supplying the molten material between the bent parts of the plate materials.

According to the fifth aspect of the invention, the two separated laser beams are applied between the molten material and the work, so that the laser beam applied to the processed portion is not limited to the molten material. The work is irradiated with a larger amount of temperature and the temperature of the work is increased. As a result, the wetted area between the molten material and the work is increased, and the strength of the joint is improved. Further, since the two laser beams are obtained by separating one laser beam, only one laser oscillator is required, and the cost can be reduced as compared with the case where two laser oscillators are used.

According to the invention of claim 6, the two laser beams are melted without using two laser oscillators by the laser beam splitting means each having the beam splitter, the reflecting mirror and the condenser lens. Irradiation can be performed between the material and the work.

According to the invention of claim 7, it is possible to increase the strength of the joint portion between the plate materials when the laser beam is irradiated while supplying the molten material between the bent portions of the plate materials.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram of a laser brazing apparatus showing an embodiment of the present invention. This processing apparatus irradiates a laser beam while the processing head 15 moves in a direction orthogonal to the paper surface in FIG. 1, and at the front side in the moving direction thereof, a molten material 19 and a plate material 21 in the same manner as in FIG. , 23 to be processed.

Here, the plate members 21 and 23 described above are provided with bent portions 27 and 29, respectively, which are bent in a direction away from the close contact portion 25 in which they are in close contact with each other.
While the molten material 19 is being supplied between 7 and 29, a laser beam is irradiated to bond and fix them.

The processing head 15 is provided with a collimation lens 31, a beam splitter 33, two bend mirrors 35 and 37 as reflecting mirrors, and a condensing lens 39, respectively. It constitutes a laser beam separating means for separating the light into two separated laser beams.

Laser light 17a is taken into the processing head 1 from a laser oscillator (not shown) through the optical fiber 41, and the taken laser light 17a reaches the collimation lens 31. When the laser light 17a passes through the collimation lens 31, it becomes parallel light 17b and reaches the beam splitter 33.

In the beam splitter 33, the parallel light 17b
1 are separated into two separated laser beams 17c and 17d, travel in the left and right directions in FIG. 1 which are separated from each other, and reach the bend mirrors 35 and 37 located in front of the travel direction.

In each of the bend mirrors 35 and 37, the two incident separated laser beams 17c and 17d are respectively reflected to separate parallel beams 17e and 17f, which reach a condenser lens 39 provided near the tip of the processing head 15. . The separated parallel rays 17e and 17f reaching the condenser lens 39 pass through the converged light rays 1e and 17f, and then reach the focal point F of the condenser lens 339.
It becomes 7g and 17h. After the convergent lights 17g and 17h intersect at the focal point F in front of the molten material 19, two separated laser beams 17i and 17j are again formed in front of the focused material F. Plate material 2
Irradiation is performed between 1 and 23, respectively.

The separated laser beams 17i and 17 described above are also used.
j is irradiated onto the processing site so that the laser beam has a high laser power density and is perpendicular to the moving direction of the processing head 15. Then, the respective separated laser beams 17i, 17 which are irradiated
j is the plate materials 21 and 23 and the molten material 1 as shown in FIG.
Repeatedly reflected between each of the plate materials 21 and 23.
It reaches the deeper part of the mutual joint part.
Laser energy of the separated laser beams 17i and 17j is absorbed by the molten material 19 and the plate materials 21 and 23, respectively, and warms them while the above-described reflection is repeated.

At this time, the molten material 19 absorbs energy from the separated laser beams 17i and 17j and the plate materials 21 and 21.
3 starts to melt due to heat transfer from the plate 3, and starts to wet the plate members 21 and 23, and as shown in FIG. 3, the plate members 21 and 23 are joined by the melted molten material 19a.

In this way, the separated laser beams 17i and 17j are separated.
However, by irradiating the molten material 19 between the plate materials 21 and 23 so as to sandwich the molten material 19 from both sides, not only the molten material 19 but also the plate materials 21 and 23 as the base material are irradiated. The temperature of the plate materials 21 and 23 is increased by efficient irradiation. Then, the separated laser beams 17i and 17j irradiate the processed portion with a portion having a high laser power density, so that the temperatures of the plate members 21 and 23 become higher.

Further, the separated laser beams 17i and 17j are
Since the plate materials 21, 23 and the molten material 19 are repeatedly reflected and reach a deeper portion of the processed portion, the plate material 2
The amount of energy transmitted to the joint portion between the Nos. 1 and 23 increases. As a result, the plate members 21 and 23 near the joint are
As shown in FIG. 3, the joint S of the molten material 19a after melting to the plate materials 21 and 23 reaches the deeper position of the joint portion, as shown in FIG. Thereby, the wetted area of the molten material 19a with respect to the plate materials 21 and 23 is increased, and the strength of the joint portion is improved.

In this case, since the molten material 19 is supplied from the front in the moving direction of the processing head 15, the molten material 19 is smoothly supplied to the processed portion, and the appearance quality of the processed portion becomes good.

Further, the two separated laser beams 17i and 17j
Is one laser beam 17a separated,
Since only one laser oscillator is required, the cost can be reduced as compared with the case where two laser oscillators are used.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a laser brazing apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a portion irradiated with laser light by the laser brazing processing apparatus of FIG.

3 is a cross-sectional view of a processed portion after brazing by the laser brazing apparatus of FIG.

FIG. 4 is a perspective view showing a processing operation by a conventional laser brazing processing apparatus.

FIG. 5 is an explanatory diagram showing a portion irradiated with laser light by a conventional laser brazing apparatus.

FIG. 6 is a cross-sectional view of a processed portion after brazing by a conventional laser brazing device.

[Explanation of symbols]

15 Processing Head 17 Laser Lights 17i, 17j Separation Laser Light 19 Melt Materials 21, 23 Plate Material (Work) 31 Collimation Lens (Laser Light Separation Means) 33 Beam Splitter (Laser Light Separation Means) 35, 37 Bend Mirror (Laser Light Separation Means) , Reflecting mirror) 39 Condensing lens (laser light separating means)

Claims (7)

[Claims] 1. A laser brazing process in which a processing head that takes in laser light irradiates the laser light while moving relative to a workpiece, and supplies a molten material for brazing to a processing site to which the laser light is irradiated. In the method, the laser beam is irradiated between both sides of the molten material in a state of being supplied to the processing portion and the work, the laser brazing method. 2. One laser beam is split into two by a laser beam splitting means, and each split laser beam split into these two is
2. The laser brazing method according to claim 1, wherein irradiation is performed between both sides of the molten material and the work so as to be substantially perpendicular to a relative movement direction of the processing head and the work. 3. The separated laser beams separated into the two,
After irradiation between both sides of the molten material and the work,
The laser brazing method according to claim 2, wherein the molten material and the work are repeatedly reflected. 4. The work is for joining two plate members to each other, and each plate member has a bent portion that bends in a direction away from an adhered portion that adheres to each other, and between the bent portions. The laser brazing method according to any one of claims 1 to 3, wherein the laser beam is irradiated while supplying the molten material. 5. A laser brazing apparatus that irradiates the laser beam while a processing head that takes in the laser beam moves relative to a workpiece and supplies a molten material for brazing to a processing site that is irradiated with the laser beam. In a laser brazing processing device for processing, the processing head is provided with a laser beam separating means for separating one captured laser beam into two, and the laser beam separating means separates each of the two separated laser beams. A laser brazing apparatus, wherein light is applied between both sides of the molten material in a state of being supplied to the processing site and the work. 6. The laser beam splitting means includes a beam splitter for splitting one laser beam in two directions, and a reflecting mirror for reflecting two split laser beams split by the beam splitter so as to be parallel to each other. , The respective separated laser beams reflected by the reflecting mirror are crossed with each other in front of the molten material, and further separated into two in front of the molten material, and irradiated between both sides of the molten material and the work. The laser brazing apparatus according to claim 5, further comprising a condenser lens. 7. The work is for joining two plate members to each other, and each plate member is provided with a bent portion that bends in a direction away from a contact portion in which the plate members are in close contact with each other, and between the bent portions. The laser brazing apparatus according to claim 5, wherein the laser light is irradiated while the molten material is being supplied.