JP2006320931A - Method of soldering, and soldered product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the soldering ability by making a plate-shape soldering material follow the joining surfaces even when the joining surfaces made of aluminum or an aluminum alloy are not flat. <P>SOLUTION: The plate-shape soldering material 1 is formed by press working so as to follow the shape of the joining surfaces 7', 8' made of the aluminum or the aluminum alloy, and then the soldering operation is performed with the plate-shape soldering material 1 sandwiched between the joining surfaces 7', 8' or the soldering operation is performed after placing a foil-shape soldering material so as to be sandwiched between the joining surfaces 7', 8' to follow the shape of the joining surfaces 7', 8'. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a brazing method and a brazed product for brazing aluminum or an aluminum alloy.

  Conventionally, a brazing material made of an aluminum alloy is generally used for brazing aluminum or an aluminum alloy. The brazing material has various shapes and states such as a plate shape, a wire shape, and a slurry shape. The plate-like brazing material is easy to grip and handle, and can be fixed to the target member simply by being sandwiched between aluminum or aluminum alloy to be brazed.

As an example of the plate-like brazing material, there is one as shown in Patent Document 1. The brazing material of Patent Document 1 is formed in a plate shape using an Al—Cu—Si alloy, and a low melting point is achieved. According to this brazing material, even if the melting point of the aluminum or aluminum alloy material to be brazed is low, the melting point of the brazing material can be further lowered. It is possible to prevent softening of the brazing target member due to variation, and deformation and strength reduction associated therewith.
JP-A-7-290273

  When using a conventional plate-like brazing material, the joining surface is usually formed into a flat shape and brazed. In the case where the joining surface has a non-planar shape, the plate-like brazing material does not follow the joining surface, and the brazing property is lowered, so that the plate-like brazing material has not been used. However, it has been required to use a plate-like brazing material that can be fixed simply by being sandwiched between brazing target members even when the joining surface of the brazing target member has a non-planar shape.

  Therefore, the present invention provides a brazing method and a brazed product that can improve brazing performance by causing a plate-like brazing material to follow the joint surface even when the joint surface of aluminum or aluminum alloy is not flat. The task is to do.

  In order to solve the above-mentioned problem, the invention according to claim 1 is a brazing method for brazing a joining surface of aluminum or aluminum alloy having a non-planar joining surface with a brazing material, which is formed into a plate shape. Is a brazing method in which after pressing is performed so as to conform to the shape of the joining surface of the aluminum or aluminum alloy, the brazing is performed by sandwiching the material into the joining surface.

  According to the above method, even if the joining surface is not flat but has a shape with irregularities, the plate-like brazing material is deformed according to the joining surface by pressing, so that the joining surface has the shape. It can be made to follow reliably. Therefore, the brazing material spreads over all the joint surfaces, and the brazing performance can be greatly improved.

  The invention according to claim 2 is a brazing method for brazing a joining surface of aluminum or aluminum alloy having a non-planar joining surface with a brazing material, wherein the brazing material formed in a foil shape is used as the aluminum or aluminum alloy. The brazing method is characterized in that brazing is performed after sandwiching between the joint surfaces and following the shape of the joint surface.

  According to the above method, since the brazing material formed in a foil shape is sandwiched between the joining surfaces to follow the shape of the joining surface, the brazing material spreads over all parts of the joining surface and brazeability is improved. It is possible to greatly improve, and it is possible to omit the trouble of pressing and the like.

  According to a third aspect of the present invention, in the brazing material according to the first or second aspect, the brazing material is formed by laminating an Al-Si alloy material, a Cu material, and a flux, and rolling. It is a method of attaching.

  According to the above method, the Al—Cu—Si alloy material is hard and has poor stretchability and bending workability, so that it is difficult to sandwich the joint surface. Since it has good plastic workability and maintains good plastic workability even after rolling, it can be easily subjected to press working of a brazing material and deformation work by being sandwiched between joint surfaces.

  According to a fourth aspect of the present invention, the Al—Si based alloy material has a Si content of 5 to 15% by mass, and the Cu material is Cu relative to the total mass of the Cu material and the Al—Si based alloy material. It is comprised so that the mass of a material may correspond to 22-37 mass%, The said flux is the brazing method of Claim 3 which is a fluoride type non-corrosive flux containing a cesium fluoride.

  According to the above method, the melting point of the brazing material can be lowered and brazing at a low temperature is possible. The thickness of the brazing material may be determined as appropriate, but a range of 0.1 to 1.5 mm is appropriate. This is because it is difficult to manufacture when the thickness of the brazing material is 0.1 mm or less, and when it exceeds 1.5 mm, there is a possibility that the problem that the brazing material cannot cope with the deformation according to the joint surface may occur. Because there is.

  The invention according to claim 5 is a brazed product characterized by being brazed and assembled by the brazing method according to any one of claims 1 to 4.

  According to the said structure, even when a joining surface is not a plane but a shape which has an unevenness | corrugation, the product by which brazing object members were fixed with high adhesiveness can be obtained.

  According to the present invention, the present invention has an excellent effect that the brazing property can be improved by causing a plate-like brazing material to follow the joint surface even when the joint surface of aluminum or aluminum alloy is not flat. Demonstrate.

  Next, the best mode for carrying out the brazing method according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a process explanatory view showing the best first embodiment for carrying out the brazing method according to the present invention, and FIG. 2 explains a method for producing a brazing material used in the brazing method according to the present invention. It is process explanatory drawing for this and a perspective view of a brazing material.

  First, the structure and manufacturing method of the brazing material used for the brazing method according to the present embodiment will be described.

  As shown in FIG. 2B, a brazing material 1 used in such a brazing method is a brazing material used when brazing aluminum or an aluminum alloy, and is formed in a plate shape. The brazing material 1 is composed of an Al (aluminum) -Si (silicon) alloy material 2, a Cu (copper) material 3, and a flux 4. The Cu material 3 is clad with the Al—Si based alloy material 2 and formed into a plate shape. The Cu clad material 3 of the plate clad material is arranged on the center side in the thickness direction of the brazing material 1 of the Al—Si based alloy material 2, and the Al—Si based alloy material 2 is disposed on the surface of the brazing material 1. Is configured. On the central side surface of the Cu material 3 in the thickness direction of the brazing material 1, a flux 4 is laid in a plate shape with a predetermined thickness. That is, the brazing material 1 is laminated in the order of the Al—Si based alloy material 2, the Cu material 3, and the flux 4 from the outside in the thickness direction toward the center. The brazing material 1 is formed in a plate shape of, for example, 0.3 mm as a whole.

  The Al-Si based alloy material 2 has a Si content of 5 to 15% by mass, and the Cu material 3 has a mass of the Cu material 3 relative to the total mass of the Cu material 3 and the Al-Si based alloy material 2. It is comprised so that it may correspond to 22-37 mass%. According to such a composition, the Al—Si based alloy material 2 and the Cu material 3 are reacted (eutectic) at the time of brazing heating, and an Al—Cu—Si ternary eutectic solder having a melting point of 525 ° C. Can be generated. As a result, brazing can be easily performed in a low temperature range of 530 to 560 ° C. When the amount of at least one of Si and Cu is out of the above numerical range, the resulting braze composition and the Al—Cu—Si ternary eutectic composition (Cu; 26.7 mass%, Si; 5.3 mass) %) Becomes too large, and brazing in the temperature range of 530 to 560 ° C. becomes difficult.

  The flux 4 has a low melting point and is excellent in non-corrosiveness. In order to omit the flux residue removing step after brazing, a fluoride-based non-corrosive flux is used. Further, the flux 4 contains CsF (cesium fluoride), and the melting point of the flux 4 is lowered to a melting point of 525 ° C. or lower of the Al—Cu—Si ternary eutectic brazing.

  The lower the cost, the more advantageous is the proportion of CsF in the fluoride-based non-corrosive flux. However, if it is less than 10 mol%, the effect of lowering the melting point of the flux 4 is not sufficient, so 530-560. Brazing at ℃ becomes difficult. Therefore, the proportion of CsF in the fluoride non-corrosive flux is preferably 10 mol% or more. It is sufficient that the mass of the flux 4 with respect to the mass of the entire brazing material 1 is 20 to 40%.

  As shown in FIG. 2A, when the brazing material 1 is manufactured, a plate-like Al—Si based alloy material 2 and a plate-like Cu material 3 are clad and prepared in advance. As the Al—Si based alloy material 2, JIS A4343, A4045, A4047, 4N43, 4N45 and the like can be used.

  Next, the clad materials of the pair of Al—Si based alloy material 2 and the Cu material 3 are respectively arranged at intervals so that the Cu material 3 faces each other. At this time, the clad material of the lower Al—Si-based alloy material 2 and the Cu material 3 is arranged to be substantially horizontal. At the same time, the flux 4 is laid (applied or sprayed) with a predetermined thickness between the opposing Cu materials 3.

  Thus, between the pair of rolling rolls 5 and 5 arranged at a predetermined interval in a state of being laminated with the Al—Si alloy material 2, the Cu material 3, and the flux 4 from the outside in the thickness direction toward the center. To pass through and roll. At this time, the Al—Si alloy material 2, the Cu material 3, and the flux 4 are rolled and thinned.

  When the brazing material 1 to be manufactured is thin, for example, when a foil-like brazing material (see FIG. 4) 6 is manufactured, a plurality of pairs of rolling rolls 5 and 5 are provided, and the entire brazing material It is formed by gradually reducing the thickness.

  Since the brazing materials 1 and 6 are manufactured by the above procedure, the foil-like brazing material 6 is naturally composed of the Al-Si alloy material 2, the Cu material 3, and the flux 4 as shown in FIG. Is done. The foil brazing material 6 is formed so that the total thickness of the Al—Si based alloy material 2 and the Cu material 3 excluding the flux 4 is 0.2 mm or less.

  Note that the arrangement order of the Al—Si alloy material 2, the Cu material 3, and the flux 4 is not limited to the above configuration, and other arrangement orders may be used. Other arrangement orders include, for example, (1) Al—Si alloy material, flux, Cu material, (2) Al—Si alloy material, flux, Cu material, flux, Al—Si alloy material, (3 ) Arrangements of Cu material, Al—Si alloy material, flux, Al—Si alloy material, Cu material, etc. are conceivable. Moreover, the flux may be provided on the surface of the brazing material.

  Furthermore, it is not restricted to the structure by which the flux 4 is provided in layers. For example, the flux may be formed in a lump shape and dispersed in the Al—Si based alloy material 2 and the Cu material 3. In this case, the flux is arranged in a zigzag shape, for example, in plan view so that adjacent fluxes are spaced apart from each other. At the time of brazing, the flux is applied to the entire joining surface of the brazing target member (not shown). Configured to go around.

  Next, a brazing method according to the present embodiment will be described with reference to FIG.

  In the present embodiment, the concave portion 11 is formed on the joint surface 7 ′ of one target member 7 among the brazing target members 7, 8 made of aluminum or aluminum alloy, and the joint surface 8 ′ of the other target member 8 is An example in which the convex portion 12 is formed will be described.

  First, as shown in FIG. 1A, the brazing material 1 formed in a plate shape is pressed so as to follow the shapes of the joining surfaces 7 ′ and 8 ′. For example, in the case of forming a dome-shaped brazing material, a plate-shaped brazing material is placed on a die having a hole and is struck with a punch with an R, and this is inserted into a larger hole diameter. Punching with a die. The brazing material 1 is processed so that both surfaces thereof are in contact with the concave portion 11 of the joint surface 7 ′ and the convex portion 12 of the joint surface 8 ′ without a gap. At this time, since the brazing material 1 is formed of the Al—Si alloy material 2 and the Cu material 3 as separate layers and integrated by rolling, the deformability is high and the press work is easy to perform. This is because both the Al—Si based alloy material 2 and the Cu material 3 have good plastic workability and maintain good plastic workability after rolling.

  Next, as shown in FIG. 1B, brazing is performed after the brazing material 1 is sandwiched and fixed by the brazing target members 7 and 8. At this time, since the brazing material 1 is in a single plate shape, it is easy to handle, and positioning is performed by meshing with the concave portion 11 of the joint surface 7 ′ and the convex portion 12 of the joint surface 8 ′. And it is easily fixed just by pinching. Thus, since the brazing material 1 is made to follow the shape of the joint surfaces 7 'and 8', at the time of brazing, the brazing material 1 spreads over all the joint surfaces 7 'and 8', and the brazing property. Can be greatly improved. Furthermore, in the present embodiment, since the brazing can be performed by engaging the convex portion 12 of the joint surface 8 'with the concave portion 11 of the joint surface 7', the brazing strength in the shear direction can be increased.

  In the present embodiment, since the brazing material 1 has a configuration in which the flux 4 is integrated, it is not necessary to separately apply the flux 4, and labor can be reduced. Moreover, since the brazing material 1 is formed with the above composition, it can be easily brazed in a low temperature range of 530 to 560 ° C. Therefore, the selection range of the material and shape of the brazing target members 7 and 8 is widened, and as the target members 7 and 8, a material that can be easily deformed can be selected, and a thin plate can also be selected. Brazed products with complex shapes such as heat exchangers and automobile parts can be formed.

  As described above, according to the present embodiment, it is possible to provide a brazed product having a complicated shape with very high bondability.

  FIG. 3 is a process explanatory view showing the second best mode for carrying out the brazing method according to the present invention.

  In the present embodiment, brazing is performed using a foil-like brazing material 6 shown in FIG.

  Also in the present embodiment, as in FIG. 1, the recess 11 is formed on the joint surface 7 ′ of one target member 7 among the brazing target members 7 and 8 made of aluminum or an aluminum alloy, and the other target member 8 A convex portion 12 is formed on the joint surface 8 ′.

  As shown in FIG. 3A, the foil brazing material 6 is positioned between the brazing target members 7 and 8. The brazing material 6 has a larger area than the cross-sectional area of the joint surfaces 7 'and 8'. Specifically, a brazing material 6 having an area that approximately matches the surface area of the joining surfaces 7 ′ and 8 ′ is used. The thickness of the brazing material 6 is equal to the clearance thickness between the joint surfaces 7 ′ and 8 ′, and is, for example, approximately 0.2 mm.

  Then, as shown in FIG. 3B, brazing is performed after the brazing material 6 is sandwiched between the joining surfaces 7 'and 8' of the brazing target members 7 and 8 made of aluminum or an aluminum alloy. At this time, since the brazing material 6 is formed in a foil shape, the shape of the joint surfaces 7 ′ and 8 ′ can be made to follow only by being sandwiched between the joint surfaces 7 ′ and 8 ′. Therefore, the brazing material 6 spreads over all the joint surfaces 7 ′ and 8 ′, and the brazing performance can be greatly improved.

  As described above, in this embodiment, in addition to obtaining the same operational effects as those of the first embodiment, it is possible to omit labor such as press working. Therefore, the brazing work efficiency can be greatly improved.

  In particular, in the present embodiment, the brazing material 6 is formed by separate layers of the Al—Si alloy material 2 and the Cu material 3 and integrated by rolling, so that the deformability is high and the joint surface High followability to 7 'and 8'.

  Thus, also in the present embodiment, it is possible to efficiently provide a brazed product having a complicated shape with very high bondability.

  In the above-described embodiment, the brazing materials 1 and 6 are formed by separate layers of the Al—Si based alloy material 2 and the Cu material 3 and are integrated by rolling. It is not limited to this. The composition of the brazing material is not limited as long as the brazing material can be deformed by pressing or sandwiching at the joining surfaces 7 ′ and 8 ′. If it is a brazing material capable of forming an Al—Cu—Si based alloy layer, low temperature brazing can be performed.

  Further, the manufacturing method of the brazing materials 1 and 6 is not limited to the above method. For example, a brazing wire material formed by filling a flux in a hollow sheath made of Cu clad on an Al-Si alloy, or a hollow sheath made of an Al-Cu-Si alloy Alternatively, the brazing wire material formed by filling the flux may be rolled with a pair of rolling rolls from the outer surface side to form a plate-like brazing material with the flux sandwiched therebetween. Furthermore, the brazing method according to the present invention is applicable even to a brazing material that does not contain flux.

(A) which showed the best 1st form for implementing the brazing method which concerns on this invention is 1st process explanatory drawing, (b) is 2nd process explanatory drawing. (A) is process explanatory drawing for demonstrating the manufacturing method of the brazing material used for the brazing method which concerns on this invention, (b) is a perspective view of a brazing material. (A) which showed the best 2nd form for implementing the brazing method which concerns on this invention is 1st process explanatory drawing, (b) is 2nd process explanatory drawing. It is the perspective view which showed the foil brazing material which concerns on this invention.

Explanation of symbols

1,6 Brazing material 2 Al-Si alloy material 3 Cu material 4 Flux 7 ', 8' Joint surface

Claims (5)

A brazing method in which a joining surface of aluminum or aluminum alloy having a non-planar joining surface is brazed with a brazing material,
A brazing method comprising: performing brazing by pressing a brazing material formed in a plate shape so as to conform to the shape of the joining surface of the aluminum or aluminum alloy, and then sandwiching the brazing material into the joining surface. A brazing method in which a joining surface of aluminum or aluminum alloy having a non-planar joining surface is brazed with a brazing material,
A brazing method comprising: brazing a brazing material formed in a foil shape between the joining surfaces of the aluminum or aluminum alloy and following the shape of the joining surfaces, followed by brazing.   The brazing method according to claim 1 or 2, wherein the brazing material is formed by laminating an Al-Si based alloy material, a Cu material, and a flux, and rolling the brazing material. The Al-Si based alloy material has a Si content of 5 to 15% by mass,
The Cu material is configured such that the mass of the Cu material with respect to the total mass of the Cu material and the Al—Si based alloy material corresponds to 22 to 37% by mass,
The brazing method according to claim 3, wherein the flux is a fluoride-based non-corrosive flux containing cesium fluoride.   A brazed product assembled by brazing by the brazing method according to any one of claims 1 to 4.

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