JP2001105054A - Joining method of metal members - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining method of metal members, by which a fastening part is not exposed at a joining part, a brazing filler metal is not swelled out, discolor damage is not caused due to heat effect, an adhesive is not swelled out in a joining method to join metal members each other, and to obtain the joining finish having a beautiful appearance. SOLUTION: Pocket parts, which constitute the space communicating between both members in abutting joining faces each other, are arranged on respective joining faces of members to be joined, a material, which is in a solidified state at a normal temp and is softened by heating, is filled in the space formed by abutting the joining faces each other. A quantity of the material, which is in a solidified state at a normal temp and is softened by heating, is equivalent to a volume of the space formed by abutting the joining faces each other, Its material is of an amorphous alloy or a thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joining method for joining metal members.

[0002]

2. Description of the Related Art Conventional joining methods for connecting metal members include a method using mechanical fastening parts such as bolts and nuts, a method using a brazing material, and a method using an adhesive. There is.

[0003] The above-mentioned prior art will be described below with reference to the drawings. FIG. 3 is an explanatory sectional view showing a conventional technique in which metal members 11 and 12 are joined by bolts 13 and nuts 14 which are mechanical fastening parts. Each of the metal members 11 and 12 is provided with a hole through which the bolt 13 passes, and the nut 14 is screwed into the screw portion 13a of the bolt 13 that passes through the two holes of the metal members 11 and 12 at the same time. The metal members 11 and 12 are joined by being tightened.

FIG. 4 is an explanatory sectional view showing a conventional technique in which metal members 11 and 12 are joined with a brazing material 15.
A brazing material 15 is sandwiched between the metal members 11 and 12, and a portion where the metal members 11 and 12 contact the brazing material 15 is heated to a temperature equal to or higher than the melting point of the brazing material 15. Then, the brazing material 15 melted at a temperature equal to or higher than the melting point.
Is diffused into the metal material of the metal members 11 and 12, and an alloy layer of the brazing material 15 and the metal members 11 and 12 is formed, thereby joining the metal members 11 and 12 to each other. Has been made.

FIG. 5 is an explanatory sectional view showing a conventional technique in which metal members 11 and 12 are joined with an adhesive 16. An adhesive 16 is applied to each of the ends of the metal members 11 and 12, and the adhesive 16 is solidified in a state where both ends where the adhesive 16 is applied are brought into contact with each other, so that the metal members 11 and 12 are hardened. Is made.

[0006]

However, in the joining method using the mechanical fastening parts of the prior art,
The bolts 13 and the nuts 14 are exposed at the joints between the metal members 11 and 12, resulting in an unattractive and unattractive joint finish.

In the conventional joining method using the brazing material 15, the brazing material 15 is heated and melted to a melting point or higher to wet and flow the gap between the joining portions between the metal members 11 and 12. In addition, the brazing material 15 may protrude from the gap between the joining portions of the metal members 11 and 12, and if the brazing material 15 protrudes, the brazing material 15 does not look good and has a poor appearance. Further, in the joining method using the brazing material 15 of the prior art, the joining portion between the metal members 11 and 12 sandwiching the brazing material 15 is heated to a high temperature equal to or higher than the melting point of the brazing material 15 (generally 700 to 700 ° C.). (About 1200 ° C.). At this time, the metal members 11 and 12 are naturally heated in the same manner, so that the metal members 11 and 12 may change color depending on the influence of heat. Damage can result in an unattractive, unattractive joint.

Further, in the bonding method using the adhesive 16 of the prior art, the adhesive 16 may protrude from the gap between the joints between the metal members 11 and 12, and the adhesive 16 protrudes. Doing so may result in a poor looking joint that does not look good.

[0009] Here, the article formed by joining the metal members 11 and 12 is a decorative article that places the most importance on good appearance and beauty of the design, that is, appearance, such as a metal band for a wristwatch. In such a case, the unsatisfactory joint finish which does not look good by the conventional technique as described above is an important problem. In extreme terms, this is a problem that can be said to be a fatal defect when an article formed by joining the metal members 11 and 12 is a product such as a decorative article that emphasizes appearance.

That is, in the above-mentioned conventional methods of joining metal members by a method using mechanical fastening parts such as bolts and nuts, a method using a brazing material, a method using an adhesive, etc. There is a problem that the finish does not look good and looks bad.

Accordingly, the present invention has been made in view of such a problem, and has as its object to expose a fastening part to a joint portion or to protrude a brazing material.
Provided is a method for joining metal members that does not suffer discoloration damage due to thermal influence and does not protrude an adhesive, that is, a method for joining metal members capable of obtaining a beautifully-appeared and beautifully finished joint. It is.

[0012]

Means for Solving the Problems In order to achieve the above object, the method described below is employed in the method for joining metal members of the present invention.

In the present invention, the invention described in claim 1 is:
A joining method for joining metal members, wherein each joining surface of each member to be joined is provided with a pocket portion serving as a space communicating between both members when the joining surfaces are brought into contact with each other, The space formed by the contact between the joining surfaces is filled with a material that is in a solidified state at room temperature but softens when heated.

In the present invention, the invention described in claim 2 is:
The amount of the material that is in a solidified state at the normal temperature but softens by heating is equivalent to the volume of the space formed by the abutment between the joining surfaces in a state expanded by heating in the joining operation process. It is characterized in that it has a volume.

[0015] Of the present invention, the invention described in claim 3 is:
The material which is in a solid state at normal temperature but softens by heating is an amorphous alloy having a glass transition temperature point.

In the present invention, the invention described in claim 4 is:
The material which is in a solid state at normal temperature but softens by heating is a thermoplastic resin.

[0017]

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

FIG. 1 is an explanatory sectional view showing an embodiment in which metal members 11 and 12 are joined by the method for joining metal members according to the present invention.

In FIG. 1, the metal members 11 and 12 are brought into contact with their joint surfaces 11a and 12a, respectively.
The members to be joined.

The metal member 11 is provided with a pocket 11b opened on the joint surface 11a. Similarly, the metal member 12 is provided with a pocket portion 12b opened to the joint surface 12a.

Here, the opening position of the pocket portion 11b in the joining surface 11a and the opening position of the pocket portion 12b in the joining surface 12a are not necessarily provided at arbitrary positions. There is a mutual positional relationship between the opening position of the pocket 11b and the opening position of the pocket 12b. When the metal members 11 and 12 are placed in the relative positional relationship to be joined, and the joining surfaces 11a and 12a are brought into contact with each other in the relative positional relationship to be joined, the pocket 11
A space 17 is provided in which b and 12b are connected to communicate with each other between the metal members 11 and 12.

That is, the metal member 1 is located between the opening position of the pocket 11b and the opening position of the pocket 12b.
In a state where the first and the second members are arranged in a relative positional relationship to be joined, the opening of the pocket part 11b and the opening of the pocket part 12b are connected to form a space 17 communicating between both the metal members 11 and 12. There is a mutual positional relationship that is said to be done.

The pocket 11b and the pocket 1
Metal members 11 and 12 formed by connection with 2b
In a space 17 communicating between the two members, a material 18 which is in a solidified state at normal temperature but softens by heating.
Is filled, thereby joining and connecting the metal members 11 and 12.

In this embodiment, the material 18 which is in a solid state at normal temperature but softens by heating includes:
An amorphous alloy 18a having a glass transition temperature point is used. That is, in the present embodiment, the space 17 communicating between both the metal members 11 and 12 is
By filling the amorphous alloy 18a having a glass transition temperature point, the metal members 11 and 12 are joined,
Connected.

Here, in this embodiment, the amorphous alloy 1 having a glass transition temperature point used as the material 18 which is in a solidified state at normal temperature but softens by heating is used.
8a will be described.

First, an amorphous alloy is used. An amorphous alloy is a multi-element alloy composed of multiple components. The alloy is obtained by heating the multi-element alloy to a molten liquid state and then performing a quenching treatment. It is. While ordinary metals and alloys are crystalline, amorphous alloys differ from other metals and alloys in that they are amorphous. By rapidly quenching a multi-element alloy in the liquid state, it is possible to solidify without forming crystals while maintaining the disordered atomic arrangement in the liquid state. , Ie, an amorphous alloy is obtained.

Further, when the solid amorphous alloy obtained as described above is heated again, when the temperature reaches a certain temperature, the solid amorphous alloy returns to a crystalline state in the same manner as a normal alloy. However, in the temperature range before this crystallization occurs,
Several types of amorphous alloys have a temperature range in which they are in a supercooled liquid state. Here, the temperature at which the liquid enters the supercooled liquid state is called a glass transition temperature point.

When a solid amorphous alloy having the above-mentioned glass transition temperature point is heated, the supercooled liquid is heated in a temperature range above the glass transition temperature point but before crystallization occurs. In this supercooled liquid state, it can be easily deformed even with a small force. That is, a solid amorphous alloy having a glass transition temperature point has a high strength near room temperature, but when heated to a temperature below the glass transition temperature point to become a supercooled liquid state, It has the characteristic that the viscosity suddenly decreases and softens.

Here, in this embodiment, the amorphous alloy 1 having a glass transition temperature point used as the material 18 which is in a solid state at normal temperature but softens by heating is used.
8a will be described more specifically. Examples of the amorphous alloy 18a having a glass transition temperature point include a zirconium-based amorphous alloy, a lanthanum-based amorphous alloy, a palladium-based amorphous alloy, and a magnesium-based amorphous alloy. As an example, in a zirconium-based amorphous alloy, zirconium 55 at
%, Aluminum 10at%, nickel 5at%, copper 3
There is an amorphous alloy having a composition of 0 at%, etc.
An alloy of this composition has a glass transition temperature point around 415 ° C. In a lanthanum-based amorphous alloy, lanthanum 55 at%, aluminum 25 at%, nickel 20
There is an amorphous alloy having a composition of at% and the like, and the alloy having this composition has a glass transition temperature point around 195 ° C. For a palladium-based amorphous alloy, palladium 40 at%, copper 30 at%, nickel 10 at%,
There is an amorphous alloy having a composition of 20 at% of phosphorus and the like, and the alloy having this composition has a glass transition temperature point around 300 ° C. For a magnesium-based amorphous alloy, magnesium 65 at%, zinc 5 at%, copper 20 a
There is an amorphous alloy or the like having a composition of t% and yttrium of 10 at%, and the alloy having this composition has a glass transition temperature point around 135 ° C.

Next, working steps for joining the metal members 11 and 12 by the method for joining metal members according to the present invention will be described with reference to the drawings.

FIG. 2 is an explanatory sectional view showing an operation process for joining the metal members 11 and 12 by the method for joining metal members according to the present invention.

In FIG. 2, the metal members 11 and 12 are brought into contact with their joint surfaces 11a and 12a, respectively.
The members to be joined.

The metal member 11 is provided with a pocket 11b opened on the joint surface 11a. Similarly, the metal member 12 is provided with a pocket portion 12b opened to the joint surface 12a.

Here, the opening position of the pocket portion 11b in the joining surface 11a and the opening position of the pocket portion 12b in the joining surface 12a are not necessarily provided at arbitrary positions. There is a mutual positional relationship between the opening position of the pocket 11b and the opening position of the pocket 12b. When the metal members 11 and 12 are placed in the relative positional relationship to be joined, and the joining surfaces 11a and 12a are brought into contact with each other in the relative positional relationship to be joined, the pocket 11
b and 12b are connected to provide a space that communicates between both of the metal members 11 and 12.

That is, between the opening position of the pocket portion 11b and the opening position of the pocket portion 12b, the metal member 1 is provided.
In a state in which 1 and 12 are arranged in a relative positional relationship to be joined, the opening of the pocket portion 11b and the opening of the pocket portion 12b are connected to form a space communicating between both of the metal members 11 and 12. There is a mutual positional relationship.

FIG. 2A is an explanatory cross-sectional view showing a first step in an operation step of joining the metal members 11 and 12 by the method of joining metal members according to the present invention. In the first step, the metal members 11 and 12 are arranged in a relative positional relationship to be joined in the left-right direction on the paper surface and the direction perpendicular to the paper surface. That is, at least the metal member 11 or the metal member 1
When the second member 2 is moved, the joining surfaces 11a and 12a come into contact with each other in a relative positional relationship to be joined, the opening of the pocket portion 11b and the opening of the pocket portion 12b are connected, and the metal members 11 and 12 are connected.
The metal members 11 and 12 are arranged in a state where a space communicating with both members is formed. Here,
The metal members 11 and 12 are arranged with a gap 19 provided between the metal members 11 and 12.

FIG. 2B is an explanatory cross-sectional view showing a second step in the process of joining the metal members 11 and 12 by the method of joining metal members according to the present invention. In the second step, the gap 19 is provided by disposing the metal members 11 and 12 in the first step as described above.
Next, a material 18 which is in a solid state at normal temperature but softens by heating is arranged. In this embodiment, the material 18 which is in a solidified state at normal temperature but softens by heating.
As amorphous alloy 1 having a glass transition temperature point
8a is used. Regarding the amorphous alloy 18a having a glass transition temperature point, several kinds of substances have already been described above, but in this embodiment, one of them is a magnesium-based amorphous alloy 18b (composition:
Magnesium 65at%, zinc 5at%, copper 20at
%, Yttrium 10 at%, glass transition temperature point: 13
(Around 5 ° C.). In this embodiment, as shown in FIG. 2, after the metal members 11 and 12 are arranged in a relative positional relationship to be joined, the material 18 which is in a solid state at room temperature but softens by heating is formed. Although arranged, the process can be reversed. That is,
It is also possible to perform the step (1) after performing the step (2) in FIG.

Here, the amount of the magnesium-based amorphous alloy 18b disposed in the gap 19 is determined by the opening and the pocket of the pocket portion 11b in a state where the magnesium-based amorphous alloy 18b is softened and expanded by heating in the third step described below. The volume is controlled to be equal to the volume of a space formed by being connected to the opening of the portion 12b. The purpose of this management is that if the amount of the magnesium-based amorphous alloy 18b is excessive in the state after the completion of the joining operation shown in FIG. Is to prevent it. Conversely, if the amount of the magnesium-based amorphous alloy 18b is insufficient, the filling amount into the space 17 is insufficient, resulting in poor bonding such as insufficient bonding strength. It also has the purpose of preventing poor bonding.

FIG. 2C is an explanatory cross-sectional view showing a third step in the process of joining the metal members 11 and 12 by the method of joining metal members according to the present invention. In this third step, a heating device (not shown) is started,
The magnesium-based amorphous alloy 18b arranged in the second step is heated to a temperature at which it is softened. In this embodiment, since the magnesium-based amorphous alloy 18b having a glass transition temperature around 135 ° C. is used as the material 18 which is in a solid state at normal temperature but softens by heating, the material 18 is heated to 135 ° C. or more. .

In the case of the magnesium-based amorphous alloy 18b used in the present embodiment, if the temperature exceeds 185 ° C., the supercooled liquid state is removed and crystallized, and easily deformed. Loses the possible properties. Therefore, the heating temperature range is 135 ° C. or more and 185
It is controlled below ℃. In this embodiment, the heating temperature is 17
It is maintained at a constant temperature of 0 ° C. Here, the heating temperature of 170 ° C. is the heating temperature (approximately about 700 to 1200 ° C.) in the bonding method using the brazing material of the related art.
Since the temperature is low as compared with the above, the thermal influence on the metal members 11 and 12 is naturally small, and there is no fear of causing discoloration damage.

Although the heating device is not shown here, heating by a high-frequency induction coil, heating by an infrared heater, heating by a cartridge heater or a band heater, or immersion in silicone oil heated by various heaters. There are various heating means, such as heating by means of a heater. Then, an appropriate heating means is selected and adopted from them according to the heating temperature range or the controllability of the heating temperature.

FIG. 2D is an explanatory sectional view showing a fourth step in the process of joining the metal members 11 and 12 by the method of joining metal members according to the present invention. In the fourth step, the metal member 11 is gradually lowered in the up-down direction of the paper surface or the metal member 12 is gradually lowered by a pressing device (not shown) while maintaining the heating state in the third step. To the joint surface 1
1a and the joining surface 12a are brought into pressure contact with each other. Then, the magnesium-based amorphous alloy 18b softened by the heating in the third step becomes the metallic members 11 and 1
2, and gradually deformed by viscous flow into the inside of the pocket 11b and the inside of the pocket 12b. When the joining surface 11a of the metal member 11 and the joining surface 12a of the metal member 12 finally reach a state where they are pressed against each other, a space 17 communicating between the two members of the metal members 11 and 12 is formed. Within the third
Is filled with the magnesium-based amorphous alloy 18b which has been softened by the heating in the step (2).

The above-mentioned viscous flow of the magnesium-based amorphous alloy 18b into the pocket portion 11b and into the pocket portion 12b refers to the glass transition temperature point in the description of the amorphous alloy having the glass transition temperature point. Although described as a feature of the amorphous alloy, it is a viscous flow due to softening to such an extent that it can be easily deformed even with a small force. As described in the description of the second step, the amount of the magnesium-based amorphous alloy 18b is equal to the volume of the space 17 formed by connecting the opening of the pocket 11b and the opening of the pocket 12b. The volume is managed. Therefore, the magnesium-based amorphous alloy 18b does not flow from the gap between the joints between the metal members 11 and 12, and does not run out.

In the conventional joining method using a brazing material, the brazing material 15 is heated and melted to a temperature equal to or higher than the melting point to wet and flow the gap between the joining portions between the metal members 11 and 12. In some cases, the brazing material 15 may flow out and protrude from the gap between the joints between the members 11 and 12, resulting in a poorly-looking and unattractive joint finish. According to the method,
There is no need to worry about such deterioration of the appearance of the joined finish due to the protrusion.

FIG. 2 (5) is an explanatory sectional view showing a fifth step in the process of joining the metal members 11 and 12 by the method of joining metal members according to the present invention. This fifth step is a cooling step, in which the heating device (not shown) started in the third step is stopped, and the magnesium-based amorphous alloy 18b and the metal members 11 and 12 are stopped.
Is cooled from the state heated to 170 ° C. to room temperature. Then, the magnesium-based amorphous alloy 18b
Is a material 18 that is in a solidified state at room temperature but softens by heating, and thus solidifies.

As a result, the joining surface 11 of the metal member 11
a and the joining surface 12a of the metal member 12 are pressed against each other, and the magnesium-based amorphous alloy 18b filled in the space 17 communicating between both of the metal members 11 and 12 is solidified. That is, the joining of the metal member 11 and the metal member 12 is performed.

In the cooling method of the fifth step in this embodiment, a heating device (not shown) is stopped, and then cooling is performed to room temperature by natural heat radiation. In addition, forcible cooling means can be used, which is effective.

In this embodiment, the pocket 11b and the pocket 12b are tapered so that the width of the pocket gradually decreases from the bottom toward the opening. However, this is one of the ideas for providing an anchor effect and increasing the bonding strength.
The shapes of 1b and the pocket portion 12b are not limited to these. It goes without saying that bonding can be made in various pocket shapes other than the tapered pocket portion in this embodiment.

As a measure for increasing the bonding strength at the time of bonding by providing an anchor effect, it is often the case that the surface roughness of the bonding surface to which the adhesive is applied when bonding with the adhesive is intentionally roughened. In the same manner as described above, in the method for joining metal members according to the present invention, the pocket 1
It is effective and possible to intentionally roughen the inner surfaces of the pocket 1b and the pocket portion 12b as a means for increasing the bonding strength.

Further, in the above-described embodiment, the magnesium-based amorphous alloy 18b having a glass transition temperature around 135 ° C. is used as the material 18 which is in a solid state at normal temperature but softens by heating. However, it is also effective and possible to use a thermoplastic resin or the like.

[0051]

As is clear from the above description, in the method for joining metal members according to the present invention, when the joining surfaces of the members to be joined are brought into contact with each other, the distance between the two members is increased. A pocket portion is provided as a communicating space, and a space formed by the contact between the joining surfaces is filled with a material which is in a solidified state at normal temperature but softens by heating.

Further, the amount of the material which is in a solid state at normal temperature but softens by heating is determined by the contact between the joining surfaces in a state of being softened and expanded by heating in the joining operation process. Volume that is equivalent to the volume of the space to be made.

The material which is in a solid state at normal temperature but softens by heating is an amorphous alloy having a glass transition temperature point.

Alternatively, the material which is in a solid state at normal temperature but softens by heating is a thermoplastic resin.

Therefore, according to the method for joining metal members of the present invention, the fastening parts are exposed at the joints, the brazing material protrudes, discoloration damage due to heat influences occurs, and the adhesive protrudes. It is possible to provide a joining method of a metal member without any problem, that is, a joining method of a metal member capable of obtaining an attractive and beautifully-applied joining finish.

[Brief description of the drawings]

FIG. 1 shows a method for joining metal members according to the present invention.
It is explanatory sectional drawing which shows one Example which joined the metal members 11 and 12.

FIG. 2 shows a method for joining metal members according to the present invention.
It is explanatory sectional drawing which shows the working process which joins metal members 11 and 12.

FIG. 3 is an explanatory sectional view showing a conventional technique in which metal members 11 and 12 are joined by bolts 13 and nuts 14 which are mechanical fastening parts.

FIG. 4 is an explanatory sectional view showing a conventional technique in which metal members 11 and 12 are joined by a brazing material 15;

FIG. 5 is an explanatory sectional view showing a conventional technique in which metal members 11 and 12 are joined with an adhesive 16;

[Explanation of symbols]

Reference Signs List 11 metal member 11a joining surface of metal member 11b pocket portion provided on joining surface 11a of metal member 11 12 metal member 12a joining surface of metal member 12 12b provided on joining surface 12a of metal member 12 A pocket portion 17 A space communicating between both of the metal member 11 and the metal member 12 18 A material which is in a solid state at normal temperature but softens by heating 18a An amorphous alloy having a glass transition temperature point

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Sato 840 Takeno, Shimotomi, Tokorozawa-shi, Saitama F-term in the Research Institute of Citizen Watch Co., Ltd. 3J001 AA03 DA00 EA00

Claims (4)

[Claims] 1. A joining method for joining metal members, wherein each joining surface of each member to be joined is a space that becomes a space communicating between both members when the joining surfaces are brought into contact with each other. A method for joining metal members, comprising: providing a space formed by abutment of the joining surfaces with a material that is in a solid state at normal temperature but softens by heating. 2. The amount of the material which is in a solidified state at room temperature but softens by heating is determined by the amount of the space formed by the abutment of the joining surfaces in a state of being expanded by heating in the joining operation process. The method for joining metal members according to claim 1, wherein the volume is made equal to the volume. 3. The metal member according to claim 1, wherein the material which is in a solidified state at room temperature but softens by heating is an amorphous alloy having a glass transition temperature point. Joining method. 4. The method for joining metallic members according to claim 1, wherein the material which is in a solid state at normal temperature but softens by heating is a thermoplastic resin.