JP3843349B2 - Brazing method of metal material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brazing method for a metal material, and more specifically, a cylindrical portion having a predetermined length and inclined with respect to a horizontal or vertical line, such as an intake manifold for automobiles or a heat exchanger. In manufacturing an article provided with a first metal material having a second metal material having a hole into which the cylindrical portion of the first metal material is inserted, the cylindrical portion of the first metal material is formed into a hole in the second metal material. The present invention relates to a method for brazing both metal materials by a brazing method using a short cylindrical brazing material in a state of being inserted into the inside.
[0002]
In this specification, the term “aluminum” includes aluminum alloys in addition to pure aluminum. In this specification, the term “hole” includes a bottomed hole in addition to the through hole.
[0003]
[Prior art and problems to be solved by the invention]
For example, brazing using a placing method of a metal pipe (30) having a horizontal end and a metal part (31) having a horizontal hole (32) into which the horizontal end of the metal pipe (30) can be inserted is conventionally performed. As shown in FIG. 6, first, a large-diameter portion (34) for fitting a brazing material into a metal tube (30) insertion side portion of a hole (32) of a metal component (31) through a step portion (33). Insert the horizontal end of the metal pipe (30) into the hole (32), and insert the short cylindrical brazing material (36) fitted over the metal pipe (30) into the large diameter part (34). In this state, flux was used, and brazing was performed by heating in an air atmosphere or a nitrogen gas atmosphere in a furnace.
[0004]
However, when brazing is performed by a conventional method, when the brazing material (36) is melted, a portion of the brazing material including the uppermost portion of the entire joint area to be welded over a predetermined length in the circumferential direction flows down due to gravity. As shown in FIG. 7, the upper portion of the fillet (35) formed between the outer peripheral surface of the metal tube (30) and the inner peripheral surface of the hole (32) of the metal part (31) is sufficiently small. There was a problem that brazing strength could not be obtained. There was also a risk of leakage from this part. In addition, the lower part of the fillet (35) is larger than the upper part, and the fillet (35) becomes non-uniform over the entire circumference, and the appearance after brazing becomes unsightly.
[0005]
Therefore, in order to solve such a problem, in the method shown in FIGS. 6 and 7, a refilling brazing material different from the short cylindrical brazing material (36) is disposed on the upper portion of the joining planned portion. In addition, the gap between the outer peripheral surface of the metal pipe (30) and the inner peripheral surface of the short cylindrical brazing material (36) and the short The gap between the outer peripheral surface of the cylindrical brazing material (36) and the inner peripheral surface of the large-diameter portion (34) is reduced over the entire circumference, and includes the uppermost part of the entire area to be joined and extends over a predetermined length in the circumferential direction. A method in which the molten brazing material remains in this part is also considered.
[0006]
However, in the former method of the above two methods, the fillet formed in the lower part of the joint portion after brazing is much larger than that of the upper part, and the appearance after brazing becomes unsightly. There is. Similarly, the latter method has a problem that the work of combining the metal pipe (30), the metal part (31), and the short cylindrical brazing material (36) becomes extremely troublesome.
[0007]
An object of the present invention is to provide a method of brazing a metal material that solves the above problems.
[0008]
[Means for Solving the Problems and Effects of the Invention]
According to a first aspect of the present invention, there is provided a metal material brazing method comprising: a first metal material having a predetermined length and having a horizontal or inclined cylindrical portion; and a hole into which the cylindrical portion of the first metal material is inserted. A method of brazing two metal materials by a brazing method using a short cylindrical brazing material in a state where a cylindrical portion of a first metal material is inserted into a hole of a second metal material, After inserting the cylindrical portion of the metal material into the hole of the second metal material, an inwardly raised portion is formed in the lower portion of the site to be joined on the inner peripheral surface of the hole, whereby the cylinder in the upper portion of the site to be joined is formed. The gap between the outer peripheral surface of the shaped portion and the inner peripheral surface of the hole is reduced.
[0009]
According to the brazing method of the metal material of the invention of claim 1, as described above, after inserting the cylindrical portion of the first metal material into the hole of the second metal material, the portion to be joined on the inner peripheral surface of the hole An inwardly raised portion is formed in the lower portion of the member, thereby reducing the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the hole in the upper portion of the portion to be joined. Therefore, the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the hole in the upper portion of the hole remains in the portion where the gap is reduced. Therefore, the upper part of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and leakage from the brazed part can be prevented.
[0010]
According to a second aspect of the present invention, there is provided a metal material brazing method according to the first aspect of the invention, wherein a plurality of radially inward ridges are formed on the inner peripheral surface of the hole of the second metal material at intervals in the circumferential direction. The part is formed.
[0011]
According to a third aspect of the present invention, there is provided a metal material brazing method comprising: a first metal material having a predetermined length and having a horizontal or inclined cylindrical portion; and a hole having a hole into which the cylindrical portion of the first metal material is inserted. A method of brazing two metal materials by a brazing method using a short cylindrical brazing material in a state where a cylindrical portion of a first metal material is inserted into a hole of a second metal material, After inserting the cylindrical portion of the metal material into the hole of the second metal material, the first metal material protrudes inward and extends over a predetermined length to the upper portion of the portion to be joined on the inner peripheral surface of the hole of the second metal material. A protrusion that closely contacts the outer peripheral surface of the cylindrical portion is formed.
[0012]
According to the brazing method of the metal material of the invention of claim 3, as described above, after inserting the cylindrical portion of the first metal material into the hole of the second metal material, the inner periphery of the hole of the second metal material In the upper portion of the surface to be joined, a protrusion that protrudes inward and adheres closely to the outer peripheral surface of the cylindrical portion of the first metal material over a predetermined length is formed. It will remain in the part between the outer peripheral surface of the cylindrical part in a part, and a protruding item | line. Therefore, the upper part of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and leakage from the brazed part can be prevented.
[0013]
Moreover, according to the method of brazing the metal material of the inventions of claims 1 and 3, as in the case of the method of arranging the refilling brazing material different from the short cylindrical brazing material in the upper part of the joining scheduled portion. In addition, the lower part of the fillet formed after brazing is larger than the upper part, and the appearance after brazing does not become unsightly. Further, a gap between the outer peripheral surface of the cylindrical portion of the first metal material and the inner peripheral surface of the short cylindrical brazing material and a gap between the outer peripheral surface of the short cylindrical brazing material and the inner peripheral surface of the hole of the second metal material are defined. Since it is not necessary to make it small over the entire circumference , it is easy to combine the first metal material, the second metal material, and the short cylindrical brazing material.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same thing and the same part through all drawings, and description is abbreviate | omitted.
[0015]
In the following embodiments, the method of the present invention is applied to brazing between a plenum chamber and a branch pipe in an automobile intake manifold.
[0016]
Embodiment 1
This embodiment is shown in FIGS.
[0017]
1 to 3, the plenum chamber (1) for the intake manifold is made of aluminum, for example, aluminum casting, and includes an intake inlet (not shown) and a plurality of horizontal intake outlets (2). A first large-diameter portion (4) for fitting a joint ring is formed through a first step portion (3) on an outer portion of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1). Furthermore, a second large-diameter portion (6) for fitting a brazing material is formed on the outer portion of the inner peripheral surface of the first large-diameter portion (4) via a second step portion (5). The inner diameter of the second large diameter portion (6) is larger than the inner diameter of the first large diameter portion (4).
[0018]
The branch pipe (7) for the intake manifold is made of aluminum, for example, aluminum wrought material, and has a horizontal cylindrical portion (7A) having a predetermined length at the end on the connection side to the plenum chamber (1). ing. A tube expansion portion (7a) is formed at the open end of the horizontal cylindrical portion (7A). The outer diameter of the expanded pipe portion (7a) is smaller than the inner diameter of the intake outlet (2). Then, the horizontal tubular portion (7A) of the branch pipe (7) is connected to the intake outlet (2) of the plenum chamber (1) through a horizontal joining ring (8) fitted around the circumference. It has become.
[0019]
The outer diameter of the joining ring (8) is larger than the inner diameter of the intake outlet (2) and slightly smaller than the inner diameter of the first large diameter portion (4), and the inner diameter of the hole (8A) is the branch pipe ( The diameter is slightly larger than the outer diameter of the horizontal cylindrical portion (7A) of 7). Further, a large-diameter portion (10) for fitting a brazing material is formed through a step portion (9) on the outer portion of the inner peripheral surface of the hole (8A) of the joining ring (8).
[0020]
Then, the present invention is applied to brazing of the peripheral cylindrical portion (7A) and the joining ring (8) of the branch pipe (7), and the portion around the intake outlet (2) in the joining ring (8) and the plenum chamber (1). The method is applied.
[0021]
First, the joining ring (8) is fitted around the horizontal tubular portion (7A) of the branch pipe (7), and then the opening end side portion of the horizontal tubular portion (7A) of the branch pipe (7) is taken into the intake outlet. (2) While inserting in, the joint ring (8) is inserted in the 1st large diameter part (4) of an inlet outlet (2). The joining ring (8) is fitted on the branch pipe (7) before forming the expanded pipe section (7a), or the end side opposite to the expanded pipe section (7a) after forming the expanded pipe section (7a). And place it on the branch pipe (7).
[0022]
Next, the large inner peripheral surface between the second large diameter portion (6) on the inner peripheral surface of the intake outlet (2) and the outer peripheral surface of the joint ring (8) and the hole (8A) of the joint ring (8). Short cylindrical brazing materials (11) and (12) are fitted between the diameter portion (10) and the outer peripheral surface of the horizontal cylindrical portion (7A) of the branch pipe (7).
[0023]
Next, by caulking the portion below the intake outlet (2) in the plenum chamber (1), the joint at the second large diameter portion (6) on the inner peripheral surface of the intake outlet (2) of the plenum chamber (1) A plurality of, for example, two radially inwardly raised portions (13) are formed in the lower portion of the portion to be joined to the outer peripheral surface of the ring (8) in the circumferential direction. The second large-diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1) in the upper portion of the planned portion is brought into close contact with the outer peripheral surface of the joining ring (8) to reduce the gap between them. . Further, by caulking the portion around the hole (8A) in the joining ring (8), the horizontal direction of the branch pipe (7) in the large-diameter portion (10) of the inner peripheral surface of the hole (8A) in the joining ring (8) A plurality of, for example, two radially inwardly raised portions (14) are formed in the lower portion of the portion to be joined with the cylindrical portion (7A) at intervals in the circumferential direction. The large diameter part (10) of the inner peripheral surface of the hole (8A) of the joining ring (8) in the upper part of the planned part and the outer peripheral surface of the horizontal cylindrical part (7A) of the branch pipe (7) are in close contact with each other. Reduce the gap.
[0024]
Thereafter, flux is applied and heated in an air atmosphere or a nitrogen gas atmosphere in a furnace, so that the plenum chamber (1) and the joining ring (8), and the joining ring (8) and the branch pipe (7) are horizontal. The cylindrical part (7A) is brazed at the same time. In this case, the molten brazing material is an upper portion of the joint ring (8) to be joined to the outer peripheral surface of the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1), In addition, the large diameter portion (10) of the inner peripheral surface of the hole (8A) of the joining ring (8) stays in the upper portion of the portion to be joined with the horizontal tubular portion (7A) of the branch pipe (7). Therefore, the upper part of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and leakage from the brazed part can be prevented.
[0025]
Embodiment 2
This embodiment is shown in FIG. 4 and FIG.
[0026]
In this embodiment, after fitting the joining ring (8) around the horizontal cylindrical part (7A) of the branch pipe (7), the opening end side of the horizontal cylindrical part (7A) of the branch pipe (7) is arranged. And insert the joint ring (8) into the first large-diameter portion (4) of the intake outlet (2), and then insert the inner ring of the intake outlet (2) 2 Horizontal tube between the large diameter part (6) and the outer peripheral surface of the joining ring (8), and the large diameter part (10) of the inner peripheral surface of the hole (8A) of the joining ring (8) and the branch pipe (7) The process until the short cylindrical brazing filler metal (11) and (12) are fitted between the outer peripheral surface of the shaped part (7A) is the same as that of the first embodiment.
[0027]
Next, by caulking the portion around the intake outlet (2) in the plenum chamber (1), the outer peripheral surface of the joining ring (8) in the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) A protrusion (20) is formed on the upper portion of the portion to be joined, protruding radially inward and along the outer peripheral surface of the joining ring (8) over a predetermined length. Also, by caulking the portion around the hole (8A) of the joining ring (8), joining the horizontal tubular portion (7A) of the branch pipe (7) in the large-diameter portion (10) of its inner peripheral surface A ridge (21) is formed on the upper portion of the planned portion, projecting inward in the radial direction and extending along the outer peripheral surface of the horizontal tubular portion (7A) of the branch pipe (7) over a predetermined length.
[0028]
Thereafter, flux is applied and heated in an air atmosphere or a nitrogen gas atmosphere in a furnace, so that the plenum chamber (1) and the joining ring (8), and the joining ring (8) and the branch pipe (7) are horizontal. The cylindrical part (7A) is brazed at the same time. In this case, the molten brazing material is between the ridge (20) and the outer surface of the joining ring (8), and between the ridge (21) and the horizontal tubular portion (7A) of the branch pipe (7). Will stay. Therefore, the upper part of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and leakage from the brazed part can be prevented.
[0029]
In the first embodiment, the lower part of the joint ring (8) and the outer peripheral surface of the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1), and the joint An inwardly raised portion (13) is formed on the lower portion of the hole (8A) of the ring (8) where the joint portion is to be joined with the horizontal tubular portion (7A) of the branch pipe (7) in the large diameter portion (10) of the inner peripheral surface. ) (14), and in the second embodiment, the joining ring (8) is scheduled to be joined to the outer peripheral surface of the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1). The upper part of the part, and the upper part of the part to be joined with the horizontal tubular part (7A) of the branch pipe (7) in the large diameter part (10) of the inner peripheral surface of the hole (8A) of the joining ring (8), respectively The ridges (20) and (21) are formed, but the present invention is not limited to this, and a joining ring (2) at the second large diameter portion (6) on the inner peripheral surface of the intake outlet (2) of the plenum chamber (1) ( 8) Inward ridge is formed in the lower part of the part to be joined with the outer peripheral surface Then, a ridge is formed on the upper part of the part to be joined with the horizontal tubular part (7A) of the branch pipe (7) in the large diameter part (10) of the inner peripheral surface of the hole (8A) of the joining ring (8). May be. Or, conversely, the upper part of the joint ring (8) outer peripheral surface of the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1) protrudes from the upper part. Formed in the lower part of the part to be joined with the horizontal cylindrical part (7A) of the branch pipe (7) in the large diameter part (10) of the inner peripheral surface of the hole (8A) of the joining ring (8) A ridge may be formed.
[0030]
In the two embodiments, in the brazing of the plenum chamber and the joining ring, the joining ring is the first metal material and the plenum chamber is the second metal material, and the joining ring and the branch pipe are brazed. The branch pipe is the first metal material, and the joining ring is the second metal material.
[Brief description of the drawings]
FIG. 1 shows Embodiment 1 of the present invention, in which a horizontal tubular portion of a branch pipe is inserted into an intake outlet of a plenum chamber, a joining ring is fitted into a first large diameter portion of the intake outlet, and a short tubular wax It is a vertical sectional view showing a state where a material is arranged.
[Fig. 2] Similarly, a lower portion of a portion to be joined to the outer peripheral surface of the joint ring at the second large diameter portion of the inner peripheral surface of the intake outlet of the plenum chamber, and a horizontal branch pipe at the large diameter portion of the inner peripheral surface of the joint ring. It is a vertical sectional view showing a state in which an inward raised portion is formed in each of the lower portions of the portion to be joined with the cylindrical portion.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 shows Embodiment 2 of the present invention, and shows an upper portion of a portion to be joined with the outer peripheral surface of the joint ring in the second large diameter portion of the inner peripheral surface of the intake outlet of the plenum chamber, and the inner peripheral surface of the joint ring It is a vertical sectional view showing a state in which ridges are formed on the upper part of the part to be joined with the horizontal cylindrical part of the branch pipe in the large diameter part.
5 is a cross-sectional view taken along line VV in FIG.
FIG. 6 is a vertical sectional view of a state before brazing showing a conventional brazing method of a metal material.
FIG. 7 is a vertical sectional view of a state after brazing showing a conventional brazing method of a metal material.
[Explanation of symbols]
(1): Plenum chamber
(2): Inlet outlet
(4): 1st large diameter part
(6): Second large diameter part
(7): Branch pipe
(7A): Horizontal cylindrical part
(8): Joining ring
(8A): Hole
(10): Large diameter part
(11) (12): Short tubular brazing material
(13) (14): Inner ridge
(20) (21): Projection

Claims (3)

A first metal material having a predetermined length and having a horizontal or inclined cylindrical portion, and a second metal material having a hole into which the cylindrical portion of the first metal material is inserted, are formed into a cylindrical portion of the first metal material. Is a method of brazing by a brazing method using a short cylindrical brazing material inserted in the hole of the second metal material,
After the cylindrical portion of the first metal material is inserted into the hole of the second metal material, an inwardly raised portion is formed in the lower portion of the portion to be joined on the inner peripheral surface of the hole, whereby the cylinder of the first metal material is formed. A metal material brazing method, wherein the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the hole in the upper portion of the part to be joined is lifted by lifting the shape portion.   The method for brazing a metal material according to claim 1, wherein a plurality of radially inwardly protruding portions are formed on the inner peripheral surface of the hole of the second metal material at intervals in the circumferential direction. A first metal material having a predetermined length and having a horizontal or inclined cylindrical portion, and a second metal material having a hole into which the cylindrical portion of the first metal material is inserted, are formed into a cylindrical portion of the first metal material. Is a method of brazing by a brazing method using a short cylindrical brazing material inserted in the hole of the second metal material,
After the cylindrical portion of the first metal material is inserted into the hole of the second metal material, the first metal material protrudes inwardly on the upper portion of the portion to be joined on the inner peripheral surface of the hole of the second metal material and extends over a predetermined length. A method for brazing a metal material, comprising forming a protrusion along the outer peripheral surface of the cylindrical portion of the metal material.

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