JPH09323166A - Aluminum joining method - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a method for joining aluminum, which has excellent joining strength and has high airtightness at the joined portion. A first joining member (1) and a second joining member (3) each having a joining surface to which a zinc alloy solder layer is attached in advance are provided, and at least one of the joining members (1) and (3) is made of aluminum. The joint surfaces 1a, 3a of the respective joint members 1, 3 are butted against each other with a predetermined gap portion 7 provided, and the gap portion 7 is immersed in a zinc alloy solder bath,
Ultrasonic vibration is applied to the vicinity of the gap portion 7 to fill it with molten zinc alloy solder, both joining members 1 and 3 are pulled up from the zinc alloy solder bath, and then the joining surfaces 1a and 3a are uniformly pressed. To join.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for joining aluminum, and more particularly to a method for joining aluminum in which ultrasonic vibration is applied to solder and join a plurality of joining members.

[0002]

2. Description of the Related Art Conventionally, there have been the following methods for joining aluminum. That is, JP-A-1-100
According to Japanese Patent No. 352 (first conventional example), for example, a proposal is made that a piece member having a predetermined shape is welded and fixed to an opening of a cooling water passage of a cylinder block used in an internal combustion engine or the like for the purpose of improving strength. Has been done. Further, in JP-A-1-147145 (second conventional example), a predetermined piece member is welded and fixed to an open portion of a cooling water passage as in the first conventional example. The block body is made of an aluminum alloy having a higher melting point. Furthermore, Japanese Patent Laid-Open No. 105557/1990 (the third
In the conventional example), a predetermined plug member (piece member) is made of a material having a melting point lower than that of the cylinder block body, and this is heated and welded to the cylinder block body by a heat source such as an arc or a laser.

By joining a plurality of joining members,
For example, as a method for manufacturing a cylinder block or the like, there is one disclosed in Japanese Utility Model Laid-Open No. 63-69740. This is a structure in which a cylinder block body is divided into two members, an upper part and a lower part, which are separately cast, and then these are fastened to each other by bolts.

[0004]

However, the above-mentioned prior art has the following disadvantages. That is, when an aluminum joining member is manufactured by a die casting method which is a general method, due to the characteristics of this manufacturing method, gas is dispersed and trapped as fine voids inside the casting. For this reason, in the above-mentioned ordinary welding method (laser welding, arc welding, etc.), gas defects remarkably appear, and it is not possible to obtain sufficient mechanical joining strength after joining. In addition, in the joining method of heating from the outside, the welded state becomes non-uniform and the thermal stress is locally concentrated, so that a strong joining force cannot be obtained.

Further, even when a metal material having a melting point lower than that of the joining member is melted by heating from an external heat source, there are the following disadvantages. For example, a strong oxide film is formed on the aluminum surface of the joining member formed by casting, and the joining members cannot be firmly welded together by a conventional welding method or the like. On the other hand, it may be considered that the surface treatment is performed using a flux or the like and then the welding is performed, but it is difficult to secure sufficient bonding strength. On the contrary, there has been a disadvantage that the flux causes unnecessary corrosion of the joining members.

Further, in the case of a method in which the joining member is composed of a plurality of members and these are joined and fixed by bolts or the like, a high performance gasket is used to increase the airtightness of the joining portion, or other bolts As the number of fastening points increases, the number of machining steps increases, resulting in an increase in manufacturing cost and a decrease in engine assembly work efficiency.

In addition, in the case where a predetermined through hole is formed in each joining member and these through holes need to be joined to each other, the two may be joined together by an ordinary welding method or the like.
It is not possible to eliminate the slight gap that occurs between the joint surfaces. For this reason, when fluids or the like flow into the through holes, these fluids leak to the outside through the gaps, or the fluids flowing in different through holes mix with each other. Was occurring. These phenomena are remarkable when a high-pressure fluid flows, which is a serious problem. For example, components such as an internal combustion engine are
Since many through holes are formed in the inside, the demand for the airtightness of the joint portion is higher than that of ordinary mechanical parts and the like.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for joining aluminum, in which the disadvantages of the conventional example are improved, and particularly, the joining strength is high and the airtightness of the joint is high.

[0009]

In order to achieve the above-mentioned object, in the invention according to claim 1, a first joining member and a second joining member having a joining surface to which a zinc alloy solder layer is attached in advance are provided. At least one of these joining members is made of aluminum. Then, the joining surfaces of these joining members are butted against each other with a predetermined gap portion, the gap portion is immersed in a zinc alloy solder bath, and ultrasonic vibration is applied to the vicinity of the gap portion to melt the zinc alloy solder. To fill the gap. Further, both the joining members are pulled up from the zinc alloy solder bath, and thereafter, the joining surfaces are evenly pressed and joined.

The steps of the above aluminum joining method will be described in detail. First, the first joining member and the second joining member are preheated, and ultrasonic vibration is applied to the joining surfaces of the joining members to apply zinc alloy solder. Form the layers. Then, the joint surfaces of the joint members are abutted with each other with a predetermined gap. The both are fixed by the fixing means while the two joining members are butted. Then, the integrally fixed joining members are simultaneously heated in the electric furnace.

When the joining member is heated to a predetermined temperature, the joining member is taken out and immersed in a molten zinc alloy solder bath so that the entire gap described above is immersed. At the same time, ultrasonic vibration is applied to the vicinity of the gap to sufficiently fill the melted zinc alloy solder. afterwards,
The joining member is slowly pulled up from the zinc alloy solder bath. Then, after removing the hot water, a predetermined pressing force is applied to the joint surface, and the material is naturally cooled as it is.

After the zinc alloy solder is solidified by cooling, the fixing means is removed from the joining member. Then, when necessary, predetermined machining is performed to complete the joining of the joining members.

According to the second or third aspect of the present invention, a predetermined spacer is provided between the joint surfaces of the two joint members, or a predetermined convex portion is provided on the joint member to form a gap. Other configurations and methods are the same as the invention described in claim 1. Therefore, by adjusting the thicknesses of the spacers and the convex portions when the joint surfaces on which the zinc alloy solder layer is formed are butted against each other, it is possible to flexibly change the spacing of the gap portions.

Further, in the invention described in claim 4, the gap is set to 0.2 [mm] to 1.5 [mm], and other configurations and methods are defined in claims 1 and 2. Or it is the same as the invention described in 3.

Furthermore, the invention according to claim 5 adopts a structure in which a detachable fixing means is used when the two joining members are butted against each other, and other structures and methods are described in claim 1, 2, 3 or 4. It is similar to the invention.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

First, FIG. 1 is a front view showing respective joining members joined by the aluminum joining method according to the present invention. The joining method according to the present invention includes a first joining member 1 and a second joining member 3 each having a joining surface to which a zinc alloy solder layer is previously attached, and at least one of the joining members 1 and 3 Is made of aluminum, and the joint surfaces 1a and 3a of the respective joint members 1 and 3 are butted against each other with a predetermined gap 7, and the gap 7 is immersed in a zinc alloy solder bath and the vicinity of the gap 7 is formed. The molten zinc alloy solder is filled by applying ultrasonic vibration to the two, the joining members 1 and 3 are pulled up from the zinc alloy solder bath, and then the joining surfaces 1a and 3a are uniformly pressed to join. The method is adopted.

The first joining member 1 and the second joining member 1 will be described in detail below.
The joining members 3 are both blocks made of aluminum, and a spacer 5 is arranged between them to form a predetermined gap 7. However, the joining members 1 and 3 in the present embodiment are merely examples, and the shape thereof is not limited at all. The present invention can be applied to the materials of the joining members 1 and 3 even if one of them is an iron joining member.

Inside each of the joining members 1 and 3, as shown in FIG. 2, a plurality of paths X and Y through which the fluid x and the fluid y pass.
Are formed. Here, in joining these joining members 1 and 3, there are the following requirements. That is, it is needless to say that the joining strength of the joining members 1 and 3 is sufficiently secured, but it is also necessary for each of the paths X and Y to maintain perfect airtightness even after joining. More specifically, the fluid x and the fluid y are not mixed with each other, and these fluids x and y do not leak to the outside.

Further, the joint surfaces 1a, 3 of the respective joint members 1, 3
A zinc alloy solder layer is previously attached to a. This zinc alloy solder layer is heated to an appropriate temperature for each of the joining members 1 and 3 and then immersed in a zinc alloy solder bath, and ultrasonic waves are applied through a vibration plate to apply zinc alloy to each joining surface. It is formed by coating a solder layer.

As shown in FIG. 3, a predetermined spacer 5 is arranged between the joining members 1 and 3. The spacer 5 has a role of forming a predetermined gap portion 7 between the joint surfaces 1a and 3a of the joint members 1 and 3, and is arranged at a plurality of positions on the joint surfaces 1a and 3a. Further, the shape of the spacer 5 is not particularly limited as long as it has a thickness corresponding to the desired spacing of the gap 7.
The material of the spacer 5 is not limited to aluminum, but may be iron that has been subjected to surface treatment such as Zn plating or Cu plating.

The method of forming the gap 7 in the joint surfaces 1a and 3a is not limited to the method using the spacer 5 described above. That is, as shown in FIG. 4, the joining surfaces 1a and 3a of the joining members 1 and 3 are preliminarily processed from the rough material stage.
Alternatively, a predetermined convex portion 5a may be provided. here,
The convex portions 5a shown in FIG. 4 are the first joining members 1 respectively.
In addition, the case where the convex portion 5a is provided on the second joining member 3 is shown. However, the present invention is not limited to this, and for example, the convex portion 5a may be provided only on the first joining member 1 side, or conversely, the convex portion 5a may be provided only on the second joining member 3 side. You may do it.

The space between the gaps 7 formed by the spacers 5 and 5a is 0.2 [mm] to 1.5 [mm].
It is set to a degree. For example, the gap 7 has an interval of 0.
In the case of 2 [mm] or less, the spacers 5 and the convex portions 5a are melted into the zinc alloy solder bath or melted into a narrow gap in the filling work of the molten zinc alloy solder described later. This is because the zinc alloy solder is less likely to enter and the joint strength cannot be secured. On the other hand, when the gap 7 has a gap of 1.5 [mm] or more, ultrasonic vibration is applied to the zinc alloy solder bath and the zinc alloy solder filled in the gap 7 has a surface tension of The reason is that the phenomenon of leakage to the outside is likely to occur.

As described above, the joining members 1 and 3 in which the predetermined gap portion 7 is formed and the joining surfaces 1a and 3a are butted against each other, as shown in FIG. 5, are the predetermined bolt members as fixing means. They are fixed to each other by 9. More specifically, as shown in FIG. 6, a through hole 11 having an inner diameter larger than the outer shape of the bolt member 9 is formed on the first joining member 1 side, while the second joining member 3 side is formed with Bolt member 9
A female screw portion 13 for fixing the screw portion 9a is formed. The spacer 5 has a donut shape as shown in FIG. 7. However, the fixing means for the joining members 1 and 3 is not limited to the bolt member 9 described above, and for example, a U-shaped clamp jig 10 can be used as shown in FIG. .

Next, the first members fixed to each other as described above
A process of actually joining the joining member 1 and the second joining member 3 will be described. First, as shown in FIG. 5 or 8, the joining members 1 and 3 integrated with each other are heated to a predetermined temperature. At this time, as a heating method, the joining members 1 and 3 are placed in an electric furnace. However, in addition to this, a gas burner or the like can be used as the heating method.

After heating the respective joining members 1 and 3, as shown in FIG.
As shown in FIG.
Then, the gap 7 is immersed in the molten zinc alloy solder. Then, as it is, ultrasonic vibration is applied to the vicinity of the gap 7. By this work, each joint surface 1a,
At the same time that the thickness of the zinc alloy solder layer 3a increases, the molten zinc alloy solder is completely filled in the gap 7. Here, an outline of an apparatus for applying ultrasonic vibration will be described. As shown in FIG. 9, a solder bath 20 containing a heater 17 is filled with molten zinc alloy solder. A predetermined diaphragm 19 is arranged in the zinc alloy solder bath 15, and an ultrasonic horn 21 is engaged with the diaphragm 19. Further, a vibrator 23 is joined to the ultrasonic horn 21 so that ultrasonic vibration is generated based on a signal from an oscillator 25.

Next, after the gap 7 is filled with the zinc alloy solder, the joining members 1 and 3 are slowly pulled up from the zinc alloy solder bath 15. Then, if necessary, dripping of zinc alloy solder is removed. At this time, it is necessary to handle the joining members 1 and 3 gently so that the zinc alloy solder filled in the gap 7 does not flow out.

Then, before the molten zinc alloy solder solidifies, the joining members 1 and 3 are placed on a predetermined stand 27 as shown in FIG. At this time, as a mounting method, the first joining member 1 is positioned above the second joining member 3. This is because the self-weight of the first joining member 1 is applied to the joining surfaces 1a and 3a, so that the excess portion of the zinc alloy solder filled in the gap portion 7 is discharged to the outside, and the joining surfaces 1a and 3a become uniform. This is because the bonding layer 7a that is pressed and has a uniform thickness is formed. Further, when the load is insufficient due to the weight of the first joining member 1, a predetermined pressing force may be applied from above the first joining member 1 as shown in FIG. 11.

Finally, after the zinc alloy solder is solidified, the bolt member (not shown) as a fixing means is removed, and the joining work is completed. Here, FIG. 12 is a process diagram showing the above-described joining process.

Next, as a specific example, a method of manufacturing a cylinder block of an internal combustion engine by utilizing the above-described aluminum joining method will be described in detail.

First, as a form of a general cylinder block, there is one as shown in FIGS. 13 and 14. That is, FIG. 13 shows a so-called dry liner type cylinder block 31, in which the cylinder sleeve 33 has a cooling water passage 3
It is not in contact with 5. On the other hand, FIG. 14 shows what is called a wet liner system, and the cylinder sleeve 3
The outer peripheral surface of 3 functions as a part of the cooling water passage 35. The present invention is directed to these cylinder blocks 31, 3
It is applicable to the production of 2.

Here, a method of joining cylinder blocks by soldering using ultrasonic vibration, which has been conventionally performed, will be outlined. In this method, the zinc alloy solder layer is formed in advance on the joint surface of each joint member, and the point where the joint surfaces are abutted is the same as in the present invention. While heating, ultrasonic vibration was applied by the ultrasonic bonding device while applying a predetermined pressing force. Also, a method of simply heating and applying a pressing force has been used. Therefore, these methods have the following disadvantages.

That is, as in the case of joining the cylinder blocks of the present embodiment, when the joining surface is wide and ultrasonic vibration must be applied while simultaneously pressing a wide area, a large horn is used in the ultrasonic joining apparatus. Must be provided, and a high-power oscillator and a plurality of oscillators must be linked and operated, which makes these devices large and complicated. Further, the application of ultrasonic vibration causes abrasion of the tip of the horn in contact with the joining member, which poses a problem when mass production is required.

Further, in the joining method of only heating and pressing above the melting point of the zinc alloy solder, the partially oxidized zinc alloy solder is unlikely to melt, and even if the joining surfaces are pressed after heating, the joining surfaces will not be separated from each other. The molten zinc alloy solder cannot be completely filled in the gaps, and a uniform bonding layer cannot be obtained. As a result, there is a disadvantage that the pressure resistance of the oil jacket (lubricating oil passage) and the water jacket (cooling water passage) cannot be sufficiently obtained.

The present invention is a method for joining aluminum without the above inconvenience. As shown in FIG. 15, a deck member 41 for supporting a cylinder sleeve (not shown), a crank journal portion 44 and a cylinder portion 45 are provided. Cylinder block body 4 in which the water jacket (cooling water passage, W / J) 46 has an open deck shape even though it has
3 are individually aluminum die cast. Here, referring to FIG. 13 showing the finished product, the position where these are divided is between the upper end and the lower end of the water jacket 35 to be formed.

Further, as shown in FIG. 16, in the deck member 41, a cylinder bore hole 47, a cooling water communication hole 48 to a cylinder head (not shown), and a cylinder head are provided corresponding to the cylinder block body 43. A stud bolt hole 49, an oil drop hole 50, and the like for fastening to 43 are provided by casting during aluminum die casting. Further, a through hole 51 into which a bolt member for fixing the deck member 41 and the cylinder block main body 43 is inserted is similarly provided. Especially this loophole 51
At least two are provided so that they can be accurately positioned.

The cylinder block body 43 is also formed by aluminum die casting as described above. Here, since the water jacket 46 of the cylinder block body 43 has an open deck shape,
Due to its shape, it can be easily cast out after casting. The cylinder block body 43 has screw holes 51 corresponding to the stud bolt holes 49a, the oil drop holes 50a, and the escape holes 51, similar to the deck member 41.
a is formed.

After the casting, the deck members 41 and the cylinder block main body 43 are first milled to remove the black skin of the joint surfaces 41a and 43a (see FIG. 15). The work of removing the black skin is to properly adhere the zinc alloy solder to the joint surfaces 41a and 43a in the soldering process by applying ultrasonic vibration in the subsequent process.

Next, as for the deck member 41 and the cylinder block body 43 as the joining members, the milled joining surfaces 41a and 43a face the diaphragm 19 of the ultrasonic soldering apparatus as shown in FIG. It is placed in the orientation. Then, in this state, ultrasonic vibration is applied to the cylinder block main body 43 through the vibration plate 19, and the low melting point zinc alloy solder is attached to the joint surface 43a. Here, as the setting conditions for soldering by ultrasonic vibration, the oscillation frequency is about 20 [KHz] and the oscillator output is 250 to 500.
[W], the preheating temperature of the joining member due to heating in the furnace is 370
The application time of the ultrasonic vibration is 6 to 10 seconds. The zinc alloy solder has a melting point of 390 [° C.] or less. This is because when a solder having a melting point of 390 [° C.] or higher is used, blisters occur in the die cast product.

Of the deck member 41 and the cylinder block body 43 to which the zinc alloy solder layer is applied as described above, the cast hole of the cylinder block body 43 is threaded. This is for fixing the bolt member 9 as described in detail in FIG. On the other hand, the casting hole on the deck member 41 side is left as the through hole 51 as described above. In this way, one member is threaded and the other is left as the through hole 51, so that the deck member 41 becomes free when the zinc alloy solder is filled in the gap in the later process, and the gap is left. This is because the zinc alloy solder can be uniformly spread.

Next, as shown in FIG. 18, the joining surfaces 41a and 43a of the deck member 41 and the cylinder block body 43 are butted against each other through the donut-shaped spacer 5 (see FIG. 7). The spacer 5 is made of a thin plate made of an aluminum alloy, and its specific shape is that the outer diameter is φ.
10, inner diameter φ6.5, thickness 0.5 [mm]. At this time, by using the pin member 81 or the like to point the positioning of the deck member 41 and the cylinder block body 43,
Accurate positioning can be performed. Then, as shown in FIG. 19, the bolt member 9 is inserted through the hole formed in the central portion of the spacer 5 to fix the deck member 41 and the cylinder block body 43. Here, the surface of the bolt member 9 was previously coated with a predetermined ceramic powder for the purpose of preventing seizure or adhesion of zinc alloy solder.
The hexagonal hole formed in the head of the bolt member 9 is filled with silica-based heat insulating material wool to prevent unnecessary adhesion of the zinc alloy solder.

After that, while the deck member 41 and the cylinder block body 43 are integrally fixed, they are re-assembled into
It is heated in a heating furnace (not shown) up to about 70 ° C. Then, when the joining member reaches a predetermined temperature, as shown in FIG. 20, the gap portion 7 formed between the joining surfaces is immersed in the zinc alloy solder bath 15, and the surface of the deck member 41 opposite to the joining surface is removed. It is placed on the diaphragm 19 and ultrasonic vibration is applied. The conditions for applying ultrasonic vibrations at this time are almost the same as those for forming the zinc alloy solder layer described above.

By the above operation, the thickness of the zinc alloy solder layer formed on the joint surface is increased, and the molten zinc alloy solder is sufficiently filled in the entire gap. Then, after that, the cylinder block body 43 and the deck member 41
Is slowly lifted from the zinc alloy solder bath 15 to remove dripping of the zinc alloy solder, and then placed on a predetermined flat plate with the deck member 41 facing down. As a result, the self-weight of the cylinder block body 43 acts on the joint surface, and the excess zinc alloy solder staying in the gap flows out to the outside, so that a joint layer having a uniform overall thickness can be obtained.

Cylinder block body 43 and deck member 4
After joining No. 1, the zinc alloy solder is solidified by cooling to a predetermined temperature. Then, after that, the bolt member is removed, and finally, conventional machining such as cutting of the inner peripheral wall of the cylinder bore hole is performed, and press fitting of the cylinder sleeve 33 is performed,
A closed deck type cylinder block made of aluminum die casting as shown in FIG. 21 is completed.

As another specific example, the present invention was tried to be applied to the manufacture of a so-called wet liner type closed-cylinder cylinder block. In this embodiment, as shown in FIG. 22, a deck member 61 supporting a cylinder sleeve (not shown) and a cylinder block body 6 are provided.
3 and 3 are separately aluminum die cast. Here, the dividing position of the cylinder block body 63 and the deck member 61 is
It is set between the upper end and the lower end of the water jacket (W / J) of the cylinder block shown in FIG. 14 as an example of the finished product.

As in the case of the dry liner type described above, the deck member 61 has a cylinder bore hole 67 corresponding to the cylinder block body 63, a cooling water communication hole 68 to a cylinder head (not shown), and a cylinder head. A stat bolt hole 69 for fastening to the block body 63, an oil drop hole 70, and the like are provided by casting during aluminum die casting. Further, a through hole 71 into which a bolt member for fixing the deck member 61 and the cylinder block body 63 is inserted is similarly provided. In particular, this through hole 71 is provided so that both can be accurately positioned.
Provide at least two.

The cylinder block body 63 is also formed by aluminum die casting as described above. The cylinder block body 63 has the stud bolt hole 69a, the oil drop hole 70a, and the screw hole 71 to which the bolt member is fastened, like the deck member 61 described above.
a is formed.

The deck member 61 and the cylinder block main body 63 are milled after casting, and low-melting point zinc alloy solder is applied to the processed joint surfaces 61a and 63a. Next, as shown in FIG. 23, the deck member 61 and the joint surfaces 61a, 63a of the cylinder block body 63 are butted against each other via the spacer 7.
Then, the gap formed between the joint surfaces 61a and 63a is immersed in a zinc alloy solder bath.

Finally, by performing conventional machining such as cutting the inner peripheral wall of the cylinder bore hole 67 and press-fitting the cylinder sleeve 33, a wet type of closed die type made of aluminum die casting as shown in FIG. The liner type cylinder block is completed.

After the joining work is completed, the state of the joining surface is shown in FIG.
As shown in FIG. This FIG. 25 shows V- in FIG.
It is sectional drawing in the V line. As shown in the drawing, the zinc alloy solder is sufficiently filled in the gap, and the water jacket and the oil jacket are properly joined together with the respective paths.

[0051]

As described above, in the present invention, a gap is provided between the joint surfaces, and the molten zinc alloy solder is filled in the gap while applying ultrasonic vibration to join the joint members. And Therefore, there is an excellent effect that a bonding layer having a uniform thickness can be formed over the entire bonding surface. In addition, along with this, even when a passage through which a fluid or the like flows is formed in the joining member, there is an excellent effect that the pressure resistance and airtightness of each passage after joining can be sufficiently ensured.

Further, in the present invention, after joining the respective joining members, no special ultrasonic joining device for joining is required. Therefore, not only the facility cost can be suppressed, but also the work process can be simplified, so that the temporal manufacturing efficiency can be improved, which is an excellent effect.

Further, the gap portion is provided by utilizing the spacer having a simple shape or the convex portion directly formed on each joining member. Therefore, there is an excellent effect that a desired gap can be formed without requiring a particularly complicated device or member.

Further, the clearance is 0.2 to 1.5.
It was decided to set it to [mm]. Therefore, it is possible to surely prevent the spacer or the convex portion from being melted out due to the narrow gap, and it is possible to surely fill the gap with the molten zinc alloy solder. On the other hand, by setting the gap interval to 1.5 [mm] or less, it is possible to reliably prevent the phenomenon that the zinc alloy solder filled in the gap flows out due to the influence of surface tension. Produces excellent results.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, showing a state in which both joining members are butted against each other via a spacer.

2 is a perspective view showing a specific shape of the joining member disclosed in FIG. 1, and FIG. 2 (A) shows the first joining member;
(B) shows a 2nd joining member.

FIG. 3 is a cross-sectional view showing a state in which a spacer is arranged between the first joining member and the second joining member to form a gap.

FIG. 4 is a cross-sectional view showing a state in which a convex portion is provided on the first joining member and the second joining member and a gap portion is formed between them.

FIG. 5 is a cross-sectional view showing a state where the first joining member and the second joining member are fixed by a bolt member.

FIG. 6 is an enlarged cross-sectional view showing a fixing structure of each joining member by the bolt member disclosed in FIG.

7A and 7B are views showing a spacer used to form a gap portion, FIG. 7A is a plan view, and FIG.
Shows a front view.

FIG. 8 is a front view showing a state in which the respective joining members are fixed to each other by a clamp jig.

FIG. 9 is a cross-sectional view showing a state where a molten zinc alloy solder is filled in a gap portion.

FIG. 10 is a front view showing a state in which excess zinc alloy solder is discharged after the gap portion is filled with the zinc alloy solder.

FIG. 11: To discharge excess zinc alloy solder,
It is a front view showing the state where pressing force is applied.

FIG. 12 is a diagram illustrating a joining process of the aluminum joining method of the present invention.

FIG. 13 is a view showing a dry-liner type closed-cylinder type general cylinder block.

FIG. 14 is a view showing a general cylinder block of a wet liner type and a closed deck type.

FIG. 15 is a view showing a specific example of the present invention, and a sectional view showing a state before joining the deck member and the cylinder block body.

16 is a plan view showing the member disclosed in FIG. 15,
16A shows a deck member, and FIG. 16B shows a cylinder block body.

FIG. 17 is a cross-sectional view illustrating a state in which a joint surface of a cylinder block body is coated with a zinc alloy solder layer.

FIG. 18 is a cross-sectional view illustrating a state in which the deck member is brought into contact with the cylinder block body via the spacer.

FIG. 19 is an enlarged cross-sectional view showing the vicinity of a bolt member.

FIG. 20 is a cross-sectional view illustrating a state where a molten zinc alloy solder is filled in a gap formed between a deck member and a cylinder block body.

FIG. 21 is a sectional view showing the cylinder block after joining is completed.

22 is a diagram showing another specific example, and FIG.
22A shows a plan view of the deck member, and FIG. 22B shows a plan view of the cylinder block body.

FIG. 23 is an explanatory view showing a state where the deck member disclosed in FIG. 22 is brought into contact with the cylinder block body.

FIG. 24 is a cross-sectional view showing the cylinder block after joining is completed.

FIG. 25 is a cross-sectional structural view showing a joined state of the joined surfaces taken along the line VV of FIG. 16.

[Explanation of symbols]

 1 1st joining member 1a joining surface 3 2nd joining member 3a joining surface 5 spacer 5a convex part 7 gap part 15 zinc alloy solder bath 9 fixing means (bolt member) 10 fixing means (clamp jig)

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[Procedure amendment]

[Submission date] August 23, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Fig. 25

[Correction method] Change

[Correction contents]

FIG. 25 is a metallurgical structure of a joint surface taken along line VV in FIG. 16.
Is a photograph showing.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area F02F 1/00 F02F 1/00 K

Claims (5)

[Claims] 1. A first joining member and a second joining member each having a joining surface to which a zinc alloy solder layer is previously attached, and at least one of the joining members is made of aluminum. The joint surfaces are butted against each other with a predetermined gap, and the gap is immersed in a zinc alloy solder bath, and ultrasonic vibration is applied to the vicinity of the gap to fill the molten zinc alloy solder, A method for joining aluminum, characterized in that the joining member is pulled up from the zinc alloy solder bath, and then the joining surface is uniformly pressed to join. 2. The method for joining aluminum according to claim 1, wherein a predetermined spacer is provided between the joining surfaces of the joining members to form the gap. 3. The aluminum joining method according to claim 1, wherein a predetermined convex portion is provided on at least one of the joining surfaces of the joining members to form the gap. 4. The distance between the gaps is 0.2 [mm] to
2. The value is set to 1.5 [mm].
2. The method for joining aluminum according to 2 or 3. 5. The aluminum joining method according to claim 1, 2, 3 or 4, wherein a detachable fixing means is used when the joining members are butted.