JPH11192580A - Method and structure for brazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a positional deviation between base materials. SOLUTION: A projecting part 15 is formed on a first base metal 10, a recessed part 23 is formed on a second base material 20, both base metals 10, 20 are positioned in a face direction by fitting the projecting part 15 to the recessed part 23. While a brazing filler metal 30 filled between both base metals 10, 20 is solidified, a positional deviation of both base metals 10, 20 are surely prevented by engaging the projecting part 15 with the recessed part 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method and a brazing structure.

[0002]

2. Description of the Related Art Brazing is a method in which a molten brazing material is poured into a gap between a pair of base materials and the base materials are joined to each other. Measures are taken to prevent it. Conventionally, as a means for preventing displacement, a method has been adopted in which a base material is addressed to a ruler, the base materials are aligned in the plane direction, and both base materials are sandwiched and fixed by a clamp. Thereafter, the base material is removed from the ruler, and the molten brazing material is poured between the base materials while being fixed by the clamp.

[0003]

In the state before the brazing material is poured, the displacement between the base materials is prevented by the frictional resistance generated between the contact surfaces, but the brazing material is poured into the gap between the base materials. Therefore, the effect of preventing displacement due to frictional resistance cannot be expected. Therefore, a means for reliably preventing the displacement of the base materials has been desired. The present invention has been made in view of the above circumstances, and has as its object to surely prevent displacement between base materials to be joined.

[0004]

The invention according to claim 1 is a brazing method in which a brazing material is poured into a gap between a pair of base materials and the base materials are joined to each other. The two base materials are positioned in the plane direction by fitting the formed convex and concave portions. According to a second aspect of the present invention, in the first aspect, the recess penetrates a surface opposite to the brazing surface. The invention of claim 3 is
This is a brazing structure in which a brazing material is poured into a gap between a pair of base materials and the base materials are joined to each other. And a positioning portion for positioning is formed.

According to a fourth aspect of the present invention, in the third aspect of the invention, the concave positioning portion is penetrated through a surface opposite to the brazing surface.

[0006]

<Functions and Effects of the Invention><Inventions of Claims 1 and 3> While the brazing material flows between the base materials, the base materials are positioned in the plane direction by the fitting of the unevenness, so that there is a gap between the base materials. The displacement can be reliably prevented. <Inventions of Claims 2 and 4> When the brazing material spreads over the entire brazing surface and the brazing is performed well, a part of the brazing material flows into the gap between the concave portion and the convex portion. If the spread is insufficient, the brazing material may not flow into the gap between the concave portion and the convex portion. This state can be visually observed from the side opposite to the brazing surface, and can be used as a guide for confirming the brazing state.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. In the present embodiment, the first base material 10 and the second base material 20 are joined using a silver brazing material 30 identified as BAg-8 in the JIS standard. First base material 10
Is a joining portion 11 in the shape of a vertical rectangular plate in FIG.
A first extending portion 12 extending rearward from one side edge of the joining portion 11 in a plate shape, and a second extending portion extending forward from the other side edge of the joining portion 11 in an L-shaped plate shape. The second extending portion 13 includes a projecting portion 13 and a hanging portion 14 extending downward from the extending end of the second extending portion 13 in a plate shape. The front surface of the bonding surface 11 is the second base material 2
This is the brazing surface 11A that is joined to the soldering surface 11A. On the brazing surface 11A, a pair of left and right positioning projections 15 is provided.
Is formed into a substantially hemispherical shape by beating from the rear side.

The second base material 20 has a joint 21 in the form of a rectangular plate perpendicular to FIG. 1 and an L-shape extending from the upper edge of the joint 21 to the rear (opposite to the first base material 10). And an extending portion 22 that extends. The front surface of the joint 21 is the brazing surface 2
1A, and the projection 15
A pair of left and right positioning recesses 23 corresponding to the above are formed. The recess 23 has a circular shape and the inner diameter is
Slightly larger than the outer diameter of the joint 2
1 from the front surface (brazing surface 21A) to the rear surface. The protrusion of the projection 15 is smaller than the thickness of the second base material 20 and the brazing material 30 in the joined state.
The size is set to be larger than the thickness.

When joining the two base materials 10 and 20, the joining portions 11 and 21 are overlapped and the brazing surfaces 11A and 21A are joined.
The projections 15 and the depressions 23 are fitted together, and the base materials 10 and 20 are positioned in the plane direction. Then, the base materials 10 and 20 are fixed in a positioning state by a clamp or the like (not shown), and flame brazing is performed. As a result, the molten brazing material 30 is poured into the gap between the base materials 10 and 20, and the poured brazing material 30 passes through the fine gap between the base materials 10 and 20 due to the capillary phenomenon and the brazing surface 11 </ b> A. , 21A. A part of the spread brazing material 30 includes the convex portions 15 and the concave portions 2.
3 also enters into a slight ring-shaped gap S. When the brazing material 30 is solidified, the base materials 10 and 20 are fixed.

While the brazing material 30 flows between the two base materials 10 and 20, the base materials 10 and 20 are
Is maintained in the surface direction by the engagement with the base material 10 and 2 until the brazing material 30 is solidified.
The displacement between 0 is reliably prevented. Further, since the concave portion 23 penetrates from the brazing surface 21A to the rear surface side, whether or not the brazing material 30 flows into the gap S between the convex portion 15 and the concave portion 23 is determined from the rear surface side of the second base material 20. It can be confirmed visually. If the brazing material 30 does not flow into the gap S between the convex portion 15 and the concave portion 23, it means that the brazing material 30 is insufficiently spread and the brazing is defective. The state of brazing can be grasped by visually checking the presence or absence of the brazing material 30 in the gap S 23.

<Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention. (1) In the above embodiment, BAg-8 was used as the brazing material, but other brazing materials can be used. (2) In the above embodiment, the case where the brazing is performed using the flame brazing has been described. However, the present invention is not limited to the flame brazing, but may be a brazing method in an atmosphere furnace using an electric furnace or the like, or a vacuum furnace. It can also be applied to a vacuum furnace brazing method or the like.

(3) In the above embodiment, two sets of the combination of the convex part and the concave part constituting the positioning part are provided. Alternatively, three or more sets may be used for positioning. Also,
The arrangement of the positioning portion can be in a form other than the embodiment. (4) In the above embodiment, only the convex portions are formed on one base material and only the concave portions are formed on the other base material. However, according to the present invention, both the convex portions and the concave portions are formed on both base materials, respectively. It may be formed.

(5) In the above embodiment, the concave portion penetrates up to the surface opposite to the brazing surface. However, according to the present invention, the concave portion may be a non-penetrating type.

[Brief description of the drawings]

FIG. 1 is a perspective view of a base material before bonding according to a first embodiment.

FIG. 2 is a front view showing a state where a base material is joined in the first embodiment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... 1st base material 11A ... brazing surface 15 ... convex part (positioning part) 20 ... 2nd base material 21A ... brazing surface 23 ... recessed part (positioning part) 30 ... brazing material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuaki Sano 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi Harness Research Institute, Inc.

Claims (4)

[Claims] 1. A brazing method in which a brazing material is poured into a gap between a pair of base materials and the base materials are joined to each other, wherein the projections and recesses formed on the brazing surface of the base material are fitted by fitting. A brazing method characterized in that both base materials are positioned in a plane direction. 2. The brazing method according to claim 1, wherein the recess penetrates a surface opposite to the brazing surface. 3. A brazing structure in which a brazing material is poured into a gap between a pair of base materials and the base materials are joined to each other. A brazing structure wherein a positioning portion for positioning materials in a plane direction is formed. 4. The brazing structure according to claim 3, wherein said concave positioning portion penetrates a surface opposite to said brazing surface.