JPH10230356A - Brazing method for metal stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sufficient brazing strength and to obtain an excellent appearance after brazing by enlarging the upper side part in the fillet formed between the outer peripheral surface of a first metal stock and the inner peripheral surface of the hole of a second metal stock. SOLUTION: In this method, both the branch pipe 7 having the prescribed length and moreover a horizontal cylindrical part 7A and the joining ring 8 having the hole 8A inserting the horizontal cylindrical part 7A of the branch pipe 7 are brazed with a preplaced brazing method using a short cylindrical brazing filler metal 12 under the state inserting the horizontal cylindrical part 7A of the branch pipe 7 into the hole 8A of the joining ring 8. After inserting the horizontal cylindrical part 7A of the branch pipe 7 into the hole 8A of the joining ring 8, an inward raised part is formed in the lower side part of the joining scheduled part in the inner peripheral surface of the hole 8A, whereby the horizontal cylindrical part 7A of the branch pipe 7 is lifted and the gap between the outer peripheral surface of the horizontal cylindrical part 7A in the upper side part of the joining scheduled part and the inner peripheral surface of the hole 8A is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brazing method for a metal material, and more particularly, to a brazing method for a vehicle having a predetermined length and a horizontal or vertical line, such as an intake manifold for automobiles and a heat exchanger. In manufacturing an article including a first metal material having a cylindrical portion inclined at an angle, and 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 manufactured. The present invention relates to a method of brazing both metal materials by a method of placing using a short tubular brazing material in a state in which the metal materials are inserted into holes of a second metal material.

[0002] In this specification, the term "aluminum" shall include aluminum alloys in addition to pure aluminum. In this specification, the term "hole" includes a bottomed hole in addition to a through hole.

[0003]

2. Description of the Related Art For example, a metal pipe (30) having a horizontal end and a metal component (30) having a horizontal hole (32) into which the horizontal end of the metal pipe (30) can be inserted. Conventionally, as shown in FIG. 6, the brazing according to the brazing method with a base part 31) is performed by firstly inserting a metal pipe (30) into a hole (32) of a metal part (31) through a step part (33). Large diameter part (34) for inserting brazing material
Then, insert the horizontal end of the metal pipe (30) into the hole (32) and fit the short cylindrical brazing material (36) fitted over the metal pipe (30) into the large diameter part.
(34), and brazing was performed by using a flux in this state and heating in a furnace in an air atmosphere or a nitrogen gas atmosphere.

However, when brazing is performed by a conventional method, when the brazing material (36) is melted, a portion of the brazing material extending over a predetermined length in the circumferential direction including the uppermost portion of the entire portion to be joined is formed. As shown in FIG. 7, the upper part 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) has a small size. Therefore, there was a problem that sufficient brazing strength could not be obtained. In addition, there is a possibility that leakage may occur from this portion. In addition, the lower portion of the fillet (35) is larger than the upper portion, and the fillet (35) becomes uneven over the entire circumference, so that the appearance after brazing becomes difficult to see.

In order to solve such a problem, in the method shown in FIG. 6 and FIG. 7, a supplementary brazing material different from the short tubular brazing material (36) is provided on the upper portion of the joining planned portion. A method of replenishing the flow that has flowed down from the short tubular brazing material (36) with the refilling brazing material, and a method of disposing the outer peripheral surface of the metal pipe (30) and the inner peripheral surface of the short tubular brazing material (36). Gap and short tubular brazing material
The gap between the outer peripheral surface of (36) and the inner peripheral surface of the large-diameter portion (34) is reduced over the entire circumference, and the part that extends over a predetermined length in the circumferential direction, including the uppermost part, of the entire part to be joined is melted. It is considered that the brazing filler metal stays in this part.

However, in the former method of the above two methods, the fillet formed at the lower part of the joining portion after brazing is extremely large as compared with the upper part, and the appearance after brazing is unsightly. Problem. Also, the latter method has a problem that the work of assembling the metal pipe (30), the metal part (31), and the short tubular brazing material (36) becomes extremely troublesome.

An object of the present invention is to provide a method for brazing a metal material which has solved the above-mentioned problems.

[0008]

SUMMARY OF THE INVENTION A first method of brazing a metal material according to the present invention comprises a first metal material having a predetermined length and a horizontal or inclined tubular portion; 1
A second metal material having a hole for inserting the cylindrical portion of the metal material,
A method of brazing both metal materials by a placing 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, wherein the first metal material is brazed. Is inserted into the hole of the second metal material, and then an inward ridge is formed in a lower portion of the portion to be joined on the inner peripheral surface of the hole, thereby forming a tubular portion in an upper portion of the portion to be joined. The gap between the outer peripheral surface and the inner peripheral surface of the hole is reduced.

According to the first metal material brazing method of the present invention, as described above, after the cylindrical portion of the first metal material is inserted into the hole of the second metal material, the cylindrical portion of the inner surface of the hole is formed. An inward bulge is formed in the lower part of the joint to be joined, thereby reducing the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the hole in the upper part of the joint to be joined. 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 joining scheduled portion remains at a portion where the gap is reduced. Therefore, the upper portion of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and the occurrence of leakage from the brazed portion can be prevented.

A second method of brazing a metal material according to the present invention comprises a first metal material having a predetermined length and a horizontal or inclined cylindrical portion, and a hole into which the cylindrical portion of the first metal material is inserted. The two metal materials are brazed using a short cylindrical brazing material in a state where the cylindrical portion of the first metal material is inserted into the hole of the second metal material. The method
After the cylindrical portion of the first metal material is inserted into the hole of the second metal material, the first metal material protrudes inward at an upper portion of the inner peripheral surface of the hole on the inner peripheral surface of the hole, and extends over a predetermined length. The present invention is characterized in that a ridge is formed so as to be in close contact with the outer peripheral surface of the cylindrical portion of the metal material.

According to the second metal material brazing method of the present invention, after inserting the cylindrical portion of the first metal material into the hole of the second metal material, as described above, A ridge that projects inward and is in close contact with the outer peripheral surface of the cylindrical portion of the first metal material over a predetermined length is formed on an upper portion of the portion to be joined on the inner peripheral surface of the hole. In the upper part of the part, it stays at the part between the outer peripheral surface of the tubular part and the ridge. Therefore, the upper portion of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and the occurrence of leakage from the brazed portion can be prevented.

Further, according to the two metal brazing methods of the present invention, a refilling brazing material different from the short cylindrical brazing material is arranged on the upper portion of the portion to be joined. In addition, the lower part of the fillet formed after brazing is larger than the upper part, so that the appearance after brazing does not become unsightly. Further, the 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 the clearance 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 set. Since it is not necessary to reduce the size over the entire circumference, the work of combining the first metal material, the second metal material, and the short tubular brazing material becomes easy.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings. It is to be noted that the same components and the same portions are denoted by the same reference symbols throughout the drawings, and description thereof will be omitted.

In the following embodiment, the method of the present invention is applied to brazing of a plenum chamber and a branch pipe in an automobile intake manifold.

Embodiment 1 This embodiment is shown in FIGS.

1 to 3, a plenum chamber (1) for an intake manifold is made of aluminum, for example, aluminum casting, and has an intake inlet (not shown) and a plurality of horizontal intake outlets (2). I have. Plenum chamber
A first large-diameter portion (4) for fitting a joining ring is formed on an outer portion of the inner peripheral surface of the intake outlet (2) of (1) via a first step (3). A second large-diameter portion (6) for fitting a brazing material is formed on an outer portion of the inner peripheral surface of the first large-diameter portion (4) via a second step (5). The second
The inner diameter of the large diameter portion (6) is larger than the inner diameter of the first large diameter portion (4).

The branch pipe (7) for the intake manifold is made of aluminum, for example, wrought aluminum, and has a predetermined length of a horizontal cylindrical portion (7A) at the end on the connection side to the plenum chamber (1). have. An expanded tube portion (7a) is formed at the open end of the horizontal tubular portion (7A). The outer diameter of the expanded portion (7a) is smaller than the inner diameter of the intake outlet (2). Then, the horizontal cylindrical portion (7A) of the branch pipe (7) is inserted into a plenum chamber (1) through a horizontal joining ring (8) fitted around the same.
It is connected to the intake outlet (2).

The outside diameter of the joining ring (8) is larger than the inside diameter of the intake outlet (2) and slightly smaller than the inside diameter of the first large diameter portion (4), and the inside diameter of the hole (8A) is Horizontal tubular part of branch pipe (7)
The diameter is slightly larger than the outer diameter of (7A). Also the joining ring
A large-diameter portion (10) for fitting a brazing filler metal is formed on the outer portion of the inner peripheral surface of the hole (8A) of (8) via a step (9).

Then, brazing of the horizontal tubular portion (7A) of the branch pipe (7) and the joining ring (8), and the joining ring (8) and the portion around the intake outlet (2) in the plenum chamber (1). The method of the present invention is applied to the method.

First, a joining ring (8) is fitted around the horizontal tubular portion (7A) of the branch pipe (7), and then a portion of the horizontal tubular portion (7A) of the branch pipe (7) on the opening end side. Is inserted into the intake outlet (2), and the joining ring (8) is fitted into the first large-diameter portion (4) of the intake outlet (2). The joining ring (8) is
Before forming a), it is fitted over the branch pipe (7), or after forming the expanded part (7a), it is fitted over the branch pipe (7) from the end side opposite to the expanded part (7a).

Next, between the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) and the outer peripheral surface of the joining ring (8), and the inner periphery of the hole (8A) of the joining ring (8). Between the large-diameter portion (10) of the surface and the outer peripheral surface of the horizontal tubular portion (7A) of the branch pipe (7).
1) Fit (12).

Then, by crimping a portion of the plenum chamber (1) below the intake outlet (2),
At the lower part of the joining ring (8) at the second large-diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1), at the lower part of the portion to be joined to the outer peripheral surface, there is a circumferential gap. A plurality, e.g., two, radially inward ridges (13) are formed, thereby forming a second portion of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1) in the upper part of the portion to be joined. The large diameter portion (6) and the outer peripheral surface of the joining ring (8) are brought into close contact with each other to reduce the gap therebetween. Also, by caulking a portion around the hole (8A) in the joint ring (8), the hole (8A) in the joint ring (8) is formed.
The horizontal cylindrical portion (7) of the branch pipe (7) at the large diameter portion (10) on the inner peripheral surface
A plurality of, for example, two radially inwardly protruding portions (14) are provided at the lower portion of the portion to be joined with A) at circumferential intervals.
A large diameter portion (10) of the inner peripheral surface of the hole (8A) of the joining ring (8) and an outer peripheral surface of the horizontal cylindrical portion (7A) of the branch pipe (7) in the upper part of the above-mentioned joint to be joined are formed. And the gap between them is reduced.

Thereafter, a 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) ) And the horizontal tubular part (7A). In this case, the molten brazing material is deposited on the second large-diameter portion on the inner peripheral surface of the intake outlet (2) of the plenum chamber (1).
The horizontal cylinder of the branch pipe (7) at the upper part of the joint ring (8) to be joined to the outer peripheral surface in (6), and the hole (8A) of the joint ring (8) and the large diameter part (10) of the inner peripheral surface It will remain in the upper part of the part to be joined to the shape (7A). Therefore,
The upper portion 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 portion can be prevented.

Embodiment 2 This embodiment is shown in FIG. 4 and FIG.

In this embodiment, after joining the joining ring (8) around the horizontal tubular portion (7A) of the branch pipe (7), the opening in the horizontal tubular portion (7A) of the branch pipe (7) is opened. Insert the end portion into the intake outlet (2), fit the joining ring (8) into the first large-diameter portion (4) of the intake outlet (2), and further fit the inner periphery of the intake outlet (2). Between the second large diameter portion (6) of the surface and the outer peripheral surface of the joining ring (8), and the hole (8A) of the joining ring (8), the large diameter portion (10) of the inner peripheral surface and the branch pipe (7). The steps until the short cylindrical brazing materials (11) and (12) are fitted to the outer peripheral surface of the horizontal cylindrical portion (7A) are the same as those in the first embodiment.

Next, by caulking the portion around the intake outlet (2) in the plenum chamber (1), the joining ring at the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) is formed.
(8) A ridge (20) projecting radially inward and extending along the outer peripheral surface of the joining ring (8) over a predetermined length is formed on an upper portion of a portion to be joined to the outer peripheral surface. Also, by caulking the portion around the hole (8A) of the joint ring (8), the large diameter portion (10) of the inner peripheral surface of the joint ring (8) is joined to the horizontal tubular portion (7A) of the branch pipe (7). A ridge (21) projecting radially inward and extending along the outer peripheral surface of the horizontal tubular portion (7A) of the branch pipe (7) is formed over a predetermined length at an upper portion of the planned portion.

Thereafter, a 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). ) And the horizontal tubular part (7A). In this case, the molten brazing material is
0) and the outer peripheral surface of the joining ring (8), and between the ridge (21) and the horizontal tubular portion (7A) of the branch pipe (7). Therefore, the upper portion of the fillet formed at the joint after brazing also has a sufficient size, so that sufficient brazing strength can be obtained and the occurrence of leakage from the brazed portion can be prevented.

In the first embodiment, the plenum chamber
The joining ring (8) at the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) of (1), the lower portion of the portion to be joined to the outer peripheral surface, and the hole (8A) of the joining ring (8) ) Forming inwardly protruding portions (13) and (14) on the lower portion of the large-diameter portion (10) of the inner peripheral surface at a portion to be joined to the horizontal tubular portion (7A) of the branch pipe (7), In the second embodiment, the joining ring (8) in the second large-diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1), the upper portion of the portion to be joined to the outer peripheral surface, and the joining ring (8) hole
(8A) Protrusions (20) are respectively formed on the large diameter portion (10) of the inner peripheral surface at the upper part of the junction tube (7A) to be joined with the horizontal tubular portion (7A).
(21) is formed, but is not limited to this, and the second large-diameter portion on the inner peripheral surface of the intake outlet (2) of the plenum chamber (1).
An inner ridge is formed in the lower part of the joint ring (8) to be joined with the outer peripheral surface in (6), and the hole (8) in the joint ring (8) is formed.
A) The horizontal cylindrical part of the branch pipe (7) at the large diameter part (10) on the inner peripheral surface
A ridge may be formed on the upper part of the part to be joined with (7A). Alternatively, on the contrary, the upper surface of the joining ring (8) at the second large diameter portion (6) of the inner peripheral surface of the intake outlet (2) of the plenum chamber (1) is projected upward. A hole is formed inside the hole (8A) of the joining ring (8) at the lower part of the large-diameter portion (10) of the inner peripheral surface of the branch pipe (7) where it is to be joined to the horizontal tubular portion (7A). A ridge may be formed.

In the above two embodiments, in brazing the plenum chamber and the joining ring, the joining ring is made of the first metal material and the plenum chamber is made of the second metal material. In brazing, the branch pipe is a first metal material and the joining ring is a second metal material.

[Brief description of the drawings]

FIG. 1 shows a first embodiment 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 solder is used. It is a vertical sectional view showing the state where materials were arranged.

FIG. 2 shows a lower portion of a portion of the inner peripheral surface of the intake outlet of the plenum chamber, which is to be joined to the outer peripheral surface of the joining ring at a second large diameter portion, and a horizontal portion of a branch pipe at the large diameter portion of the inner peripheral surface of the joining ring. It is a perpendicular sectional view showing the state where an inward protruding part was formed in a lower part of a part scheduled to join with a cylindrical part, respectively.

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

FIG. 4 shows Embodiment 2 of the present invention, in which an upper portion of a portion of the inner peripheral surface of the intake outlet of the plenum chamber that is to be joined to the outer peripheral surface of the joining ring at the second large diameter portion, and an inner peripheral surface of the joining ring. It is a vertical sectional view showing the state where the convex streak was formed in the upper part of the portion of the large diameter part which is going to be joined with the horizontal cylindrical part of the branch pipe.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a vertical sectional view showing a state before brazing showing a conventional brazing method for metal materials.

FIG. 7 is a vertical sectional view showing a state after brazing showing a conventional brazing method for metal materials.

[Explanation of Signs] (1): Plenum chamber (2): Intake outlet (4): First large diameter part (6): Second large diameter part (7): Branch pipe (7A): Horizontal cylindrical part ( 8): Joint ring (8A): Hole (10): Large diameter part (11) (12): Short tubular brazing material (13) (14): Inwardly protruding part (20) (21): Convex ridge

Claims (2)

[Claims] 1. 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 by a first metal member. A method of brazing both metal materials by a brazing method using a short cylindrical brazing material in a state where a tubular portion of the material is inserted into a hole of the second metal material. After the portion is inserted into the hole of the second metal material, an inward protruding portion is formed in a lower portion of the portion to be joined on the inner peripheral surface of the hole, and thereby the cylindrical portion of the first metal material is lifted and joined. A brazing method for a metal material, comprising: reducing a gap between an outer peripheral surface of a cylindrical portion and an inner peripheral surface of a hole in an upper portion of a portion. 2. 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, is formed by a first metal material. A method of brazing both metal materials by a brazing method using a short cylindrical brazing material in a state where a tubular portion of the material is inserted into a hole of the second metal material. After the portion is inserted into the hole of the second metal material, the outer peripheral portion of the cylindrical portion of the first metal material protrudes inward and extends over a predetermined length at an upper part of the portion to be joined on the inner peripheral surface of the hole of the second metal material. A brazing method for a metal material, wherein a ridge is formed along a surface.