JPS5851787B2 - Piped Pipe Tritsuke Taitono Shin Urouzuke Hohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for vacuum brazing pipes and pipe attachments, and is applied, for example, to vacuum brazing an automobile radiator tank and a coolant inlet/outlet lobe. .

Conventionally, in a radiator for an automobile, for example, a furnace brazing method or the like is generally used to braze an aluminum tank for storing engine cooling water and an aluminum cooling water inlet/outlet lobe.

The details are as follows.

As shown in Figure 1, burring hole 1 provided in tank 1
Attach the inlet vibrator 2 to a, place a ring-shaped aluminum brazing material A' around the tank 1 side of the inlet vibrator 2, melt the brazing material A' at high temperature in an air atmosphere, and braze the two together. ing.

As is well known, aluminum is oxidized in an air atmosphere and an oxide film is formed on the surface, and this oxide film makes brazing properties worse. Flux is attached.

Recently, a vacuum brazing method has been adopted to braze parts made of aluminum materials together in a vacuum atmosphere. There is a problem that the attachment is not done reliably.

As a result of various studies to analyze the above-mentioned problems, the inventors have discovered the following.

That is, there is a slight gap between the fitting part of the tank 1 and the inlet vibrator 2, and the surface tension acting on this gap draws the molten brazing filler metal A' to the gap, and the brazing filler metal A' drawn to this gap. The tank 1 and the inlet vibrator 2 are then brazed together.

The smaller the gap, the stronger the surface tension becomes.
The attracting effect of the brazing filler metal A' increases.

In the conventional furnace brazing described above, even if the gap between the tank 1 and the inlet vibrator 2 is somewhat large, the brazing material A' flows due to the action of the flux, and the brazing material A' is sufficiently filled in the gap. Since it rotates, the brazing between the tank 1 and the inlet vibrator 2 is performed reliably.

On the other hand, in the vacuum brazing method, brazing is performed in a vacuum atmosphere and the surface of the aluminum is not oxidized, so the conventional brazing method does not use flux unlike the method.

For this reason, in the conventional brazing described above, the brazing material A' does not flow as in the case of brazing, so if the gap between the tank 1 and the inlet vibrator 2 is large, surface tension no longer acts, and the gap is filled with sufficient force. The brazing material A' is not attracted, and the brazing between the tank 1 and the inlet vibrator 2 cannot be performed reliably.

The present invention has been made in view of the above points, and an object of the present invention is to reliably join a pipe attachment body such as a tank to a pipe using a vacuum brazing method.

In order to achieve the above object, in the present invention, when a pipe is fitted into a hole provided in a pipe fitting and the two are joined by vacuum brazing, one of the pipe fitting and the pipe is fitted. One end is made of an aluminum material coated with a brazing material, and the other is made of an aluminum material not covered with a brazing material, and a protrusion is provided all around the outer circumference of the pipe, and the end of the pipe is made of an aluminum material not covered with a brazing material. by fitting the part into the hole of the pipe fitting, and bringing the outer periphery of the pipe into line contact with the inner peripheral end corner of the hole of the pipe fitting at the protruding part of the pipe, and making this line contact part. Vacuum brazing is performed with the brazing filler metal positioned at.

According to the method of the present invention, the presence of the protrusion formed on the pipe ensures that the outer periphery of the pipe and the hole of the pipe fitting are in line contact over the entire circumference, and that the brazing material is applied to the line contact area. Because of the position, the flow of the brazing material to the fitting part is guaranteed even without using flux as required by conventional furnace brazing, and the fitting part of both the tank and the pipe is guaranteed at the line contact part. Since the gap is the smallest, the surface tension acting on this gap causes the molten brazing material to concentrate in this gap, making it possible to reliably braze the tank and pipe.

Next, the structure of an aluminum radiator for automobiles manufactured by the method of the present invention will be explained.

In FIGS. 2 to 6, an inlet vibrator 2 is brazed to the upper tank 1 to allow engine cooling water to flow into the tank 1. As shown in FIGS.

3 is a lower tank, to which an outlet vibe 4 for returning engine cooling water to the engine (not shown) is brazed.

Both ends of a number of tubes 5 through which engine cooling water passes are brazed to the core plate 6.7.

Between each of the tubes 5 are fins 8 bent in a meandering manner.
are interposed and brazed, and the tube 5 and the core plate 6
．． 7 and fins 8, the tanks 1 and 3 are attached to both ends of the core portion by brazing them to the core plate 6.7.

A water inlet 9 equipped with an overflow pipe 9a is brazed to the tank 1, and a seat cock 10 equipped with a drain pipe 10a is brazed to the tank 3.

Note that the water inlet 9 and the overflow pipe 9a are brazed together, and the pipe 10a and the seat cock 10 are brazed together.

The tank 1 and tank 3 each have an inlet vibrator 2.
, burring holes 1a, 3a (in which the exit vibrator 4 is fitted)
(Fig. 4), and on the end sides of the inlet vibrator 2 and the outlet vibrator 4, protrusions 2a,
4a is provided.

Then, the protrusions 2a and 4 of the inlet vibrator 2 and the outlet vibrator 4
The rising part of a is the bar tongue hole 1 of tank 1 and tank 3.
It is located at the inner peripheral end corner portions 1b and 3b of a and 3a.

On the other hand, as shown in FIG. 5 and FIG.
is provided, and the rising portion of the protrusion 9ab of this overflow pipe 9a is located at the inner peripheral end corner 9 of the hole 90 of the water inlet 9.
It is located at 0a.

Further, the seat cock 10 is provided with a hole 101 into which the pipe 10a is fitted, and a protrusion 10ab is provided on the end side of the pipe 10a over the entire outer circumference of the pipe 10a. A rising portion of the protruding portion 10ab of the pipe 10a is located at the inner peripheral end corner portion 101a of the hole 101.

In addition, tank 1, entrance vibe 2, tank 3...
All components of the radiator are made from aluminum.

An embodiment of the method of the present invention will be described below with reference to FIGS. 2 to 6.

9.5% silicon, 1.5
A tank 1 made of a metal material coated with a brazing material A consisting of % manganese and the balance (89%) aluminum;
Tank 3, core plate 6.7, and fin 8 are prepared.

In addition, an inlet vibrator 2, an outlet vibrator 4, a pipe 5, a water inlet 9, and a seat cock 10, which are made of the same material as the core material of the tanks 1 and 3, are prepared.

Furthermore, an overflow pipe 9a and a pipe 10a are prepared, which are made of a metal material having a core material made of the same material as the tanks 1 and 3, and one surface of which is coated with a brazing filler metal A made of the same material as the tanks 1 and 3.

The ends of the tubes 5 are then fitted onto the core plate 6.7, with fins 8 interposed between each of the tubes.

After assembling part of the core in this way, the core plate 6°T
The tanks 1 and 3 are fitted onto the core plate 6.7 so that they will not come off so that the outer peripheral walls of the tanks 1 and 3 are in contact with the inner peripheral walls of the core plate 6.7.

The inlet vibrator 2 is fitted into the burring hole 1a of the tank 1 by driving, and the inner peripheral end corner 1b where the brazing material A of the barring hole 1a is exposed at the protrusion 2a of the inlet vibrator 2.
is brought into line contact with the outer periphery of the inlet vibrator 2.

In addition, the outlet vibrator 4 is fitted into the burring hole 3a of the tank 3 by driving, and the inner peripheral end corner 3b where the brazing material A of the burring hole 3a is exposed at the protrusion 4a of the outlet vibrator 4 is inserted into the burring hole 3a of the tank 3. Make a line contact with the outer periphery of the

The seat cock 10 is fitted into the tank 3 (through a hole in the tank 3 (not shown)), and the pipe 10a is inserted into the seat cock 10.
The inner peripheral end corner 101 of the hole 101 of the seat cock 10 is fitted into the hole 101 of the seat cock 10 at the protrusion 10ab of the pipe 10a.
a and the outer periphery of the pipe 10a are brought into line contact.

Next, the water inlet 9 is fitted into a hole (not shown) in the tank 1, and the overflow pipe 9a is fitted into the hole 90 of the water inlet 9, and the water inlet 9 is inserted into the protrusion 9ab of the pipe 9a.
The inner peripheral end corner 90a of the hole 90 and the outer periphery of the pipe 9a are brought into line contact.

The radiator is assembled in this manner, and the vacuum brazing device maintained in a high-temperature atmosphere is placed in a furnace.

In this vacuum brazing, the brazing material A covering the tanks 1 and 3, the core plate 6.7, the fin 8, the overflow pipe 9a, and the pipe 10a is melted in a furnace.
Each component is brazed with this molten brazing material A.

Here, since the protrusion 2a of the inlet vibrator 2 exists at the fitting part of the tank 1 and the inlet vibrator 2, the outer periphery of the inlet vibrator 2 and the inner peripheral end corner 1b of the burring hole 1a of the tank 1 are connected.
The brazing material A of the tank 1 is located at the line contact portion X.

Since they are brazed in this state, the gap at the line contact part X is the smallest among the gaps that occur between the fitting parts of both 1 and 2, so the surface tension that occurs here becomes strong, In addition to this, since the brazing filler metal A is located in this part
can be easily concentrated.

Furthermore, as shown in Fig. 4, in the tank 1, the brazing material A is exposed on the entire inner surface of the burring hole 1a, so the area of brazing between the hole 1a of the tank 1 and the end of the inlet vibe 2 is small. Therefore, the brazing between the tank 1 and the inlet vibe 2 becomes extremely reliable and strong.

Note that the brazing between the tank 3 and the outlet vibrator 4 is also performed reliably and firmly for the same reason as above.

On the other hand, at the fitting part between the seat cock 10 and the pipe 10a and the fitting part between the water inlet 9 and the pipe 9a, the hole 90° 101 is not in a burring shape as shown in FIG. These pipes 9a are small.

In brazing 10a as well, since the line contact portion X is reliably formed and the brazing material A is positioned in the line contact portion X, brazing can be performed reliably.

As shown in FIG. 7, if the tips of the inlet vibrator 2 and the outlet vibrator 4 are expanded during vacuum brazing, the fitting part between the tank 1 and the inlet vibrator 2, and the fitting part between the tank 3 and the outlet vibrator 4 will be removed. The gap between the fitting part can be further reduced, and the inlet vibrator 2 and the outlet vibrator 4 are pulled during pipe expansion, so that the inner peripheral end corners 1 b of the burring holes 1 a and 3 a of each tank 1.3 are pulled. 3b are in line contact with the protrusions 2a, 4a of each pipe 2, 4, respectively, and the gap at this line contact part can be further reduced, making brazing even more reliable.

Moreover, as shown in FIG. 8, in the case of the seat cock 10 and the pipe 10a1, as well as the water inlet 9 and the overflow pipe 9a, if the tip of the pipe 10a1 and the overflow pipe 9a is expanded, the brazing becomes even more reliable.

Note that, as in the above embodiment, the burring hole 1a.

3a or just holes 90, 101 is selected depending on the product.

Furthermore, in the above embodiment, the materials of the tanks 1 and 3 and the materials of the respective pipes 2 and 4 may be reversed, and the material of the seat cock 10 and the material of the pipe 10a may be reversed.

Furthermore, the present invention is not limited to automobile radiators as in the above embodiments, but may be applied to heat exchangers of automobile heating systems, etc., which are equipped with a hot water inlet/outlet lobe and a tank. The present invention is widely applicable as long as the vacuum brazing is performed between a pipe and a pipe fitting.

As described above, in the method of the present invention, when a pipe is fitted into a hole provided in a pipe fitting and the two are joined by vacuum brazing, one of the pipe fitting and the pipe is brazed. The pipe is made of an aluminum material coated with a brazing material, and the other part is made of an aluminum material not covered with a brazing material, and a protrusion is provided all around the outer circumference of the pipe, and the end of the pipe is Fitting into the hole of the pipe fitting: Bring the outer periphery of the iron pipe into line contact with the inner peripheral end corner of the hole of the pipe fitting at the protruding part of the iron pipe, and place the solder into this line contact part. Since vacuum brazing is performed with the material in place, the protrusions formed on the pipe ensure line contact between the outer circumference of the pipe and the hole in the tank over the entire circumference, and the line The brazing metal is located in the contact area, and the gap between the fitting parts in the line contact area between the two is the smallest, so a strong surface tension acts on this smallest gap, causing the gap to close. The molten brazing filler metal can be easily concentrated, and therefore, the molten brazing filler metal can be sufficiently distributed around the fitting part between the pipe and the pipe fitting, and the pipe and the pipe fitting can be reliably brazed. It has excellent effects.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing a fitting structure between a tank 1 and an inlet vibrator 2 of an automobile radiator for explaining a conventional method, and Fig. 2 is a sectional view for explaining an embodiment of the present invention. FIG. 3 is an overall configuration diagram showing the structure of an automobile radiator to be used. In the radiator shown in FIG.
4 is an enlarged view of the main part of FIG. 3, and FIG. 5 is a sectional view showing the fitting structure of the seat cock 10, the water inlet 9, and the overflow pipe 9a of the pipe 10a1 in the radiator shown in FIG. 2. 6 is an enlarged view of the main part of FIG. 5, FIG. 7 is a sectional view for explaining another embodiment of the present invention, and corresponds to FIG. 3, and FIG. 8 is a sectional view showing the mounting structure. 5 is a cross-sectional view for explaining another embodiment of the present invention, and corresponds to FIG. 5. 1.3, 9, 10...Tank, water inlet, seat cock, 2, 4, 9a forming the pipe attachment body. 10a... Inlet vibe, outlet vibe, overflow pipe, pipe, 2a, 4a forming a pipe. 9ab, 10ab--Protrusion, lb, 3b. 90a, 101a... Inner peripheral end corner, 1a, 3a
...Burring hole, 90, 101...
... Hole, A ... Brazing metal, X ... Line contact part.

Claims (1)

[Claims] 1. A method of fitting a pipe into a hole provided in a pipe fitting and vacuum brazing the two together, the method comprising: one of the pipe fitting and the pipe having a brazing material; The pipe is made of a coated aluminum material, and the other is made of an aluminum material that is not coated with a brazing material, and a protrusion is provided along the entire outer circumference of the pipe, and the end of the pipe is attached to the pipe. Fitting into a hole in the body, the outer periphery of the pipe and the inner peripheral end corner of the hole of the pipe fitting are in line contact at the protrusion of the pipe, and the brazing material is applied to this line contact portion. A method of vacuum brazing between a pipe and a pipe fitting, which is characterized by performing vacuum brazing while the pipe is in position.