JP2023110153A - Rolling method of dissimilar metal joining material, and dissimilar metal joining material for use in the same - Google Patents

Abstract

To prevent curvature at the time when dissimilar metal joining materials are rolled, by identifying the relationship of mechanical properties of metal plates arranged on both sides and the metal plate arranged between them.SOLUTION: In a method for longitudinally rolling a dissimilar metal joining material by arranging and joining two types of metal plates in a width direction, first metal plates 10 with an elongation ratio during rolling being relatively large are arranged at both sides, and a second metal plate 20 with the elongation ratio being relatively small is arranged between them, and then the joining is performed. When the dissimilar metal joining materials are rolled longitudinally, the first metal plates 10 of both sides extending relatively large are rolled while giving tensile tension from both sides in the longitudinal direction to the second metal plate 20 arranged between them. Accordingly, the curvature at the time when the dissimilar metal joining materials are rolled is prevented effectively. The process control being more severe and complicated than before is unnecessary, and thereby it can easily be implemented industrially.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a method for rolling a dissimilar metal bonding material in which two metal plates of different types are arranged side by side and bonded together, and a dissimilar metal bonding material used in the rolling method.

When rolling a dissimilar metal bonded material in which two metal plates of different types are arranged side by side and bonded, the rolled material may be curved in the longitudinal direction due to the difference in mechanical properties of the two metals. In order to prevent such bending, jigs are fixed to both ends of the dissimilar metal bonding material, and rolling is performed while applying tensile tension from both ends. However, such a method requires extra jigs, a tensioning device, and work for fixing the jigs, and there is a limit to the length of the dissimilar metal joining material that can be rolled.

The applicant is aware of Patent Document 1 below as a prior art document relating to rolling of dissimilar metal bonding materials.

Japanese Patent Publication No. 62-50201

The above Patent Document 1 relates to a method for manufacturing a parallel-joint metal plate, and has the following description.
[Gazette, page 1, right column, lines 1 to 7]
The present invention has been made in order to eliminate the above-described drawbacks of the prior art. It is an object of the present invention to provide a method for manufacturing a parallel-joined metal sheet that can prevent lateral bending in a rolling process by picking from a position.

The above Patent Document 1 describes that symmetrically arranged alloy plates of the same type are sampled from the same material at the same position in the longitudinal direction to match the dimensional characteristics of both.

However, picking the same type of alloy plate from the same material at the same longitudinal position and symmetrically arranging them requires strict and complicated process control and is not easy to industrially implement. In addition, Patent Document 1 does not mention the relationship between the symmetrically arranged alloy plates of the same type and the metal plate arranged at the center in the width direction. In other words, JP-A-2003-200002 only aligns the dimensional characteristics of the alloy plates arranged on both sides, and does not consider the relationship between the alloy plates on both sides and the metal plate in the center, and does not have such a technical idea.

The present invention has been made with the following objects in order to solve the above problems.
A rolling method for a dissimilar metal bonding material that prevents bending when the dissimilar metal bonding material is rolled by specifying the relationship between the mechanical properties of the metal plates disposed on both sides and the metal plate disposed therebetween; A dissimilar metal bonding material used therefor is provided.

In order to achieve the above object, the dissimilar metal bonding material rolling method according to claim 1 employs the following configuration.
A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
The first metal plate, which has a relatively large elongation during rolling, is arranged on both sides, and the second metal plate, which has a relatively small elongation, is arranged therebetween to perform the joining.

In order to achieve the above object, the method for rolling a dissimilar metal bonding material according to claim 2 employs the following configuration.
A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
The first metal plate having a relatively small expansion ratio during rolling is arranged on both sides, and the second metal plate having a relatively large expansion ratio is arranged therebetween to perform the joining.

In order to achieve the above object, the dissimilar metal bonding material rolling method according to claim 3 employs the following configuration.
A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
The second metal plate, which has a relatively small elongation during rolling, is arranged on both sides, and the first metal plate, which has a relatively large elongation, is arranged therebetween to perform the joining.

In order to achieve the above object, the dissimilar metal bonding material rolling method according to claim 4 employs the following configuration.
A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
The second metal plate having a relatively large expansion ratio during rolling is arranged on both sides, and the first metal plate having a relatively small expansion ratio is arranged therebetween to perform the joining.

The method for rolling a dissimilar metal bonding material according to claim 5 employs the following configuration in addition to the configuration described in any one of claims 1 to 4.
The welding is friction stir welding performed by inserting a rotary tool into the first metal plate.

In addition to the configuration described in claim 5, the method for rolling a dissimilar metal bonding material described in claim 6 employs the following configuration.
A compound layer of the first metal and the second metal formed during the friction stir welding is crushed by the rolling to form a direct joint portion of the first metal and the second metal.

In addition to the configuration described in claim 5 or 6, the method for rolling a dissimilar metal bonding material described in claim 7 employs the following configuration.
The first metal plate on the side into which the rotary tool is inserted is made of a metal having a hardness lower than that of the second metal plate.

The method for rolling a dissimilar metal bonding material according to claim 8 adopts the following configuration in addition to the configuration described in claim 5 or 6.
The first metal plate on the side into which the rotary tool is inserted is made of a metal having a melting point lower than that of the second metal plate.

In order to achieve the above objects, the dissimilar metal bonding material according to claim 9 employs the following configuration.
A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A first metal plate having a relatively large elongation during rolling is arranged on both sides, and a second metal plate having a relatively small elongation is arranged therebetween to form a joint portion by the above-mentioned joining. .

In order to achieve the above object, the dissimilar metal bonding material according to claim 10 employs the following configuration.
A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A first metal plate having a relatively small expansion ratio during rolling is arranged on both sides, and a second metal plate having a relatively large expansion ratio is arranged therebetween to form a joint portion by the above-mentioned joining. .

In order to achieve the above object, the dissimilar metal bonding material according to claim 11 employs the following configuration.
A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A second metal plate having a relatively small elongation rate during rolling is arranged on both sides and the first metal plate having a relatively large elongation rate is arranged therebetween to form a joint portion by the above-mentioned joining. .

In order to achieve the above object, the dissimilar metal bonding material according to claim 12 employs the following configuration.
A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A second metal plate having a relatively large expansion ratio during rolling is arranged on both sides, and a first metal plate having a relatively small expansion ratio is arranged between them to form a joint portion by the above bonding. .

The dissimilar metal material according to claim 13 employs the following configuration in addition to the configuration according to any one of claims 9 to 12.
The joint portion is a joint portion by friction stir welding performed by inserting a rotary tool into the first metal plate.

The dissimilar metal material described in claim 14 employs the following configuration in addition to the configuration described in claim 13.
The first metal plate on the side into which the rotary tool is inserted is a metal having a hardness lower than that of the second metal plate.

The dissimilar metal material described in claim 15 employs the following configuration in addition to the configuration described in claim 13.
The first metal plate on the side into which the rotary tool is inserted is made of metal having a melting point lower than that of the second metal plate.

In the method of rolling a dissimilar metal bonding material according to claim 1, in the rolling, a first metal plate having a relatively large elongation during rolling is placed on both sides, and a second metal plate having a relatively small elongation is placed on both sides. are placed between them to perform the above bonding. When this dissimilar metal bonding material is rolled in the longitudinal direction, the first metal plates arranged on both sides are elongated relatively more than the second metal plate arranged therebetween. For this reason, the dissimilar metal bonding material is rolled while the first metal plates on both sides, which are relatively elongated, are applied to the second metal plate arranged therebetween while applying a tensile force in the longitudinal direction from both sides. be. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

In the method of rolling a dissimilar metal bonding material according to claim 2, in the rolling, a first metal plate having a relatively small expansion ratio during rolling is placed on both sides, and a second metal plate having a relatively large expansion ratio is placed on both sides. are placed between them to perform the above bonding. When this dissimilar metal bonding material is rolled in the longitudinal direction, the second metal plate arranged therebetween spreads relatively larger than the first metal plates arranged on both sides thereof. For this reason, the dissimilar metal bonding material is rolled while the second metal plate, which is spreading relatively large, applies a compressive stress in the width direction from the center to the first metal plates arranged on both sides of the second metal plate. be. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

In the method of rolling a dissimilar metal bonding material according to claim 3, in the rolling, the second metal plate having a relatively small elongation rate during rolling is placed on both sides, and the first metal plate having a relatively large elongation rate is placed on both sides. are placed between them to perform the above bonding. When this dissimilar metal bonding material is rolled in the longitudinal direction, the first metal plate disposed therebetween elongates relatively more than the second metal plates on both sides. Therefore, in the dissimilar metal bonding material, the second metal plates with a relatively small elongation rate placed on both sides apply compressive stress in the longitudinal direction from both sides to the first metal plate placed therebetween. Rolled while giving. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

In the method of rolling a dissimilar metal bonding material according to claim 4, in the rolling, the second metal plate having a relatively large expansion ratio during rolling is placed on both sides, and the first metal plate having a relatively small expansion ratio is placed on both sides. are placed between them to perform the above bonding. When this dissimilar metal bonding material is rolled in the longitudinal direction, the second metal plates arranged on both sides spread relatively larger than the first metal plate arranged therebetween. For this reason, the dissimilar metal bonding material is rolled by applying a compressive stress in the width direction from both sides to the first metal plate disposed between the second metal plates on both sides, which are relatively widely spread. be. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

According to a fifth aspect of the present invention, there is provided a method for rolling dissimilar metals to be joined, wherein the joining is friction stir welding performed by inserting a rotating tool into the first metal plate. Friction stir welding performed by inserting a rotating tool into the first metal plate is structurally difficult to join thin plates. Therefore, with thin plates, friction stir welding could not be selected depending on the characteristics of the joint. By the above-described rolling method, it is possible to obtain a thin plate by rolling the dissimilar metal bonding material. In other words, a thin plate can be obtained by selecting friction stir welding according to the properties of the joint and then rolling.

In the method of rolling a dissimilar metal bonding material according to claim 6, the compound layer of the first metal and the second metal formed during the friction stir welding is crushed by the rolling, and the first metal and the above A second metal direct joint is produced. Even if a compound layer of the first metal and the second metal is formed during the friction stir welding method, it is crushed by the rolling to form a direct joint between the first metal and the second metal. Therefore, the joint characteristics of the joint can be ensured.

In the method of rolling a dissimilar metal bonding material according to claim 7, the first metal plate on the side into which the rotary tool is inserted is made of a metal having a hardness lower than that of the second metal plate. Therefore, adhesion of metal to the rotary tool is also suppressed. Therefore, it is possible to reduce the frequency of maintenance such as removing metal adhering to the rotary tool and replacing the rotary tool. In addition, since the energy required to generate plastic flow is small, it is advantageous in saving power.

In the method of rolling a dissimilar metal bonding material according to claim 8, the first metal plate on the side into which the rotary tool is inserted is made of a metal having a melting point lower than that of the second metal plate. If the melting point of the first metal plate into which the rotary tool is inserted is higher than that of the first metal plate, the second metal plate, which is the mating material, begins to melt when the temperature of the first metal plate reaches a point where it plastically flows, and the joining is completed. Defects and defects may occur. By using a metal having a melting point lower than that of the second metal plate for the first metal plate into which the rotary tool is inserted, the above problems can be prevented.

In the dissimilar metal bonding material according to claim 9, a first metal plate having a relatively large elongation rate during rolling is arranged on both sides, and a second metal plate having a relatively small elongation rate is arranged therebetween. A joint portion is formed by the above-described joining. When this dissimilar metal bonding material is rolled in the longitudinal direction, the first metal plates arranged on both sides are elongated relatively more than the second metal plate arranged therebetween. For this reason, the dissimilar metal bonding material is rolled while the first metal plates on both sides, which are relatively elongated, are applied to the second metal plate arranged therebetween while applying a tensile force in the longitudinal direction from both sides. be. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

A dissimilar metal bonding material according to claim 10, wherein a first metal plate having a relatively small expansion ratio during rolling is arranged on both sides, and a second metal plate having a relatively large expansion ratio is arranged therebetween. A joint portion is formed by the above-described joining. When this dissimilar metal bonding material is rolled in the longitudinal direction, the second metal plate arranged therebetween spreads relatively larger than the first metal plates arranged on both sides thereof. For this reason, the dissimilar metal bonding material is rolled while the second metal plate, which is spreading relatively large, applies a compressive stress in the width direction from the center to the first metal plates arranged on both sides of the second metal plate. be. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

A dissimilar metal bonding material according to claim 11, wherein a second metal plate having a relatively small elongation during rolling is arranged on both sides, and the first metal plate having a relatively large elongation is arranged therebetween. A joint portion is formed by the above-described joining. When this dissimilar metal bonding material is rolled in the longitudinal direction, the first metal plate disposed therebetween elongates relatively more than the second metal plates on both sides. Therefore, in the dissimilar metal bonding material, the second metal plates with a relatively small elongation rate placed on both sides apply compressive stress in the longitudinal direction from both sides to the first metal plate placed therebetween. Rolled while giving. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

In the dissimilar metal bonding material according to claim 12, the second metal plate having a relatively large expansion ratio during rolling is arranged on both sides, and the first metal plate having a relatively small expansion ratio is arranged therebetween. A joint portion is formed by the above-described joining. When this dissimilar metal bonding material is rolled in the longitudinal direction, the second metal plates arranged on both sides spread relatively larger than the first metal plate arranged therebetween. For this reason, the dissimilar metal bonding material is rolled by applying a compressive stress in the width direction from both sides to the first metal plate disposed between the second metal plates on both sides, which are relatively widely spread. be. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

According to a thirteenth aspect of the dissimilar metal joining material, the joining portion is a joining portion by friction stir welding performed by inserting a rotary tool into the first metal plate. Friction stir welding performed by inserting a rotating tool into the first metal plate is structurally difficult to join thin plates. Therefore, with thin plates, friction stir welding could not be selected depending on the characteristics of the joint. By the above-described rolling method, it is possible to obtain a thin plate by rolling the dissimilar metal bonding material. In other words, a thin plate can be obtained by selecting friction stir welding according to the properties of the joint and then rolling.

In the dissimilar metal bonding material according to claim 14, the first metal plate on the side into which the rotary tool is inserted is a metal with lower hardness than the second metal plate. Therefore, adhesion of metal to the rotary tool is also suppressed. Therefore, it is possible to reduce the frequency of maintenance such as removing metal adhering to the rotary tool and replacing the rotary tool. In addition, since the energy required to generate plastic flow is small, it is advantageous in saving power.

In the dissimilar metal bonding material according to claim 15, the first metal plate on the side into which the rotary tool is inserted is a metal having a melting point lower than that of the second metal plate. If the melting point of the first metal plate into which the rotary tool is inserted is higher than that of the first metal plate, the second metal plate, which is the mating material, begins to melt when the temperature of the first metal plate reaches a point where it plastically flows, and the joining is completed. Defects and defects may occur. By using a metal having a melting point lower than that of the second metal plate for the first metal plate into which the rotary tool is inserted, the above problems can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining 1st Embodiment of the dissimilar metal joining material of this invention. It is a figure explaining the joining method of a dissimilar metal. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure explaining 1st Embodiment of the rolling method of the dissimilar metal joining material of this invention. FIG. 5 is a diagram illustrating a second embodiment of the dissimilar metal bonding material and rolling method thereof according to the present invention. 1 is an appearance photograph of a rolled material of Example 1. FIG. It is an appearance photograph of the rolled material of a comparative example. 4 is a cross-sectional photomicrograph of the vicinity of the joint in Example 2. FIG.

Next, a mode for carrying out the present invention will be described.

◆ 1st embodiment [Dissimilar metal joining material]
FIG. 1 is a diagram illustrating a first embodiment of the dissimilar metal bonding material of the present invention. (A) is a plan view, and (B) is a front view.

This dissimilar metal bonding material is obtained by arranging and bonding two types of metal plates of different types in the width direction (arrow W in the illustration), and is for rolling in the longitudinal direction (arrow L ₁ in the illustration). . Therefore, the longitudinal direction _L1 of each metal plate is parallel to the rolling direction _L2 during subsequent rolling.

A first metal plate 10 and a second metal plate 20 are used as the two types of metal plates. In this example, the first metal plate 10 and the second metal plate 20 are each rectangular having the longitudinal direction _L1 and the width direction W described above. Further, the thicknesses of the first metal plate 10 and the second metal plate 20 are substantially equal.

The first metal plate 10 has a relatively large elongation during rolling. That is, the first metal plate 10 has a greater elongation rate in the longitudinal direction _L1 than the second metal plate 20 during rolling.

The elongation rate e during rolling is a numerical value represented by the following formula.
e=(V ₂ -V ₁ )/V ₁ ×100
(V ₁ = entrance speed of metal plate, V ₂ = exit speed of metal plate)

The first metal plate 10 has a relatively small spread rate during rolling. That is, the first metal plate 10 has a smaller expansion rate in the width direction W during rolling than the second metal plate 20 does.

The expansion rate g at the time of rolling is a numerical value represented by the following formula.
g=(b ₂ −b ₁ )/b ₁
(b ₁ = entry side width of metal plate, b ₂ = exit side width of metal plate)

For example, when aluminum is used as the first metal plate 10 and copper is used as the second metal plate 20, the relationship between the elongation rate and the spread rate described above is obtained. However, the present invention is not limited to the above combinations. That is, the present invention can be applied to combinations of various metals as long as they are related to the elongation rate and spread rate described above, and is intended to include combinations of various metals. In addition, the metal that forms the first metal plate 10 and the metal that forms the second metal plate 20 are not limited to pure metals, and include various alloys.

The dissimilar metal bonding material is formed by disposing the first metal plate 10 having a relatively large elongation during rolling on both sides and the second metal plate 20 having a relatively small elongation between them. A joint 30 is formed by joining.
In addition, the first metal plate 10 having a relatively small expansion ratio during rolling is arranged on both sides, and the second metal plate 20 having a relatively large expansion ratio is arranged between them, and the joint 30 is formed by the above-described joining. is formed.

That is, the first metal plate 10 is arranged on both sides in the width direction W, and the second metal plate 20 is arranged therebetween. In this state, the boundary between the first metal plate 10 and the second metal plate 20 extending in the longitudinal direction _L1 on both sides of the second metal plate 20 is joined to form the joint portion 30. be.

The joint 30 is a joint 30 by friction stir welding performed by inserting a rotary tool 40 into the first metal plate 10 .

[Joining method]
FIG. 2 is a diagram illustrating a method of joining dissimilar metals. The figure illustrates a joining method by friction stir welding.

In this embodiment, the first metal plate 10 and the second metal plate 20 are arranged in the width direction and arranged adjacent to each other so as to substantially eliminate a gap. For example, it is like two metal plates butted against each other. In the drawing, only one each of the first metal plate 10 and the second metal plate 20 is shown, but in this embodiment, as described above, the first metal plate 10 and the second metal plate 20 are provided on both sides in the width direction W. The plates 10 are arranged, and the second metal plate 20 is arranged therebetween. In that case, two joints 30 are formed, and since the method of joining the two is the same, only one will be shown in FIG. 2 for explanation.

With the first metal plate 10 and the second metal plate 20 arranged side by side in the width direction, an axially rotating rotating tool 40 is inserted into the first metal member 10 side from above. At this time, the rotary tool 40 is inserted so that the outer peripheral edge of the rotary tool 40 is very close to the boundary between the first metal plate 10 and the second metal plate 20 . That is, the outer peripheral edge of the rotary tool 40 substantially coincides with the boundary and does not come into contact with the second metal plate 20 . The outer peripheral edge is the outermost rotational trajectory of the rotating rotary tool 40 .

The insertion depth at this time is such that the lower end of the rotary tool 40 is exposed from the lower surface of the first metal plate 10 . That is, the rotating tool 40 is passed through the first metal plate 10 .

The rotating tool 40 is inserted, for example, at one end in the longitudinal direction _L1 , and in that state is moved along the boundary to the other end. As a result, plastic flow occurs in the first metal plate, and the metal forming the first metal plate 10 and the metal forming the second metal plate are brought into close contact at the boundary, and the first metal plate is formed. 10 and the second metal plate 20 are joined. That is, by moving the rotary tool 40 in the longitudinal direction _L1 , the joint 30 is formed along the longitudinal direction _L1 .

In the figure, reference numeral 32 denotes a machining area 32 by the rotating tool 40 . The machining area 32 is a trajectory along which the rotary tool 40 moves, and is a belt-like area. In the processing region 32, plastic flow occurs in the first metal plate 10, and the boundary between the first metal plate 10 and the second metal plate 20 is joined by friction stir welding. Alternatively, the boundary between the first metal plate 10 and the second metal plate 20 is also joined by solid phase diffusion.

In this embodiment, the first metal plates 10 into which the rotary tools 40 are inserted are arranged on both sides of the second metal plate 20 therebetween. Accordingly, processing regions 32 are formed along the outer sides of both joints 30 .

As described above, the rotary tool 40 is inserted into the first metal plate 10 so that the outer peripheral edge of the rotary tool 40 substantially coincides with the boundary. By doing so, plastic flow occurs only in the first metal plate 10, and little plastic flow occurs in the second metal plate 20. As shown in FIG. Therefore, it is possible to obtain a good joint 30 in which two types of metals are mixed together and defects such as voids are few. Further, by inserting the rotating tool 40 only on the side of the first metal plate 10, the vertical force applied to the rotating tool 40 can be greatly reduced, and deterioration of the tool can be prevented.

The first metal plate 10 on the side where the rotary tool 40 is inserted can be made of a metal having a hardness lower than that of the second metal plate 20 . By doing so, the rotary tool 40 is inserted only into the first metal plate 10 having a low viscosity during plastic flow during friction stir welding. Therefore, adhesion of metal to the rotary tool 40 is also suppressed. Therefore, the frequency of maintenance such as removing metal adhering to the rotary tool 40 and replacing the rotary tool 40 can be reduced. In addition, since the energy required to generate plastic flow is small, it is advantageous in saving power.

The first metal plate 10 on the side where the rotary tool 40 is inserted can be made of a metal having a melting point lower than that of the second metal plate 20 . If the first metal plate 10 into which the rotary tool 40 is inserted has a higher melting point, the second metal plate 20, which is the mating material, melts when the first metal plate 10 reaches a temperature high enough to undergo plastic flow. This may result in poor bonding or defects. By using a metal having a melting point lower than that of the second metal plate 20 for the first metal plate 10 into which the rotary tool 40 is inserted, the occurrence of the above problems can be prevented.

In this way, the dissimilar metal bonding material of the present embodiment extends in the longitudinal direction _L1 on both sides of the second metal plate 20, the boundary between the first metal plate 10 and the second metal plate 20. It joins and the said joint part 30 is formed.

[Rolling method]
FIG. 3 is a view for explaining the first embodiment of the method for rolling a dissimilar metal bonding material according to the present invention. (A) is a plan view, and (B) is a front view, viewed from the entrance side. Therefore, in FIG. 3A, the bottom is the entrance side and the top is the exit side.

The dissimilar metal bonding material configured as described above is sandwiched between upper and lower rolling rolls 50 and rolled. The rolling direction _L2 is parallel to the longitudinal direction _L1 of the dissimilar metal bonding material. That is, the rolling direction _L2 is parallel to the moving direction of the rotary tool 40 in the friction stir welding described above.

In the present embodiment, a dissimilar metal bonding material in which two types of metal plates 10 and 20 of different types are arranged in the width direction and bonded together is rolled in the longitudinal direction.

In the rolling, the first metal plate 10 having a relatively large elongation rate during rolling is arranged on both sides, and the second metal plate 20 having a relatively small elongation rate is arranged between them, and the bonding is performed. I do.
In the rolling, the first metal plate 10 having a relatively small expansion ratio during rolling is arranged on both sides, and the second metal plate 20 having a relatively large expansion ratio is arranged between them, and the bonding is performed. I do.

When the dissimilar metal bonding material is rolled in the longitudinal direction _L1 , the first metal plates 10 arranged on both sides are elongated relatively more than the second metal plate 20 arranged therebetween. For this reason, the dissimilar metal bonding material is applied to the second metal plate 20 arranged between the first metal plates 10 on both sides, which are relatively elongated, from both sides in the longitudinal direction. Rolled.

Further, when the dissimilar metal bonding material is rolled in the longitudinal direction _L1 , the second metal plates 20 arranged therebetween spread relatively larger than the first metal plates 10 arranged on both sides thereof. Therefore, while the dissimilar metal bonding material spreads relatively large, the second metal plate 20 exerts a compressive stress in the width direction from the center on the first metal plates 10 arranged on both sides of the second metal plate 20. Rolled.

Therefore, the dissimilar metal bonding material can be effectively prevented from bending when rolled, and can be industrially easily realized without strict and complicated process control.

The compound layer of the first metal and the second metal formed during the friction stir welding method can be crushed by the rolling to form a direct joint between the first metal and the second metal. . Even if a compound layer of the first metal and the second metal is formed during the friction stir welding method, it is crushed by the rolling to form a direct joint between the first metal and the second metal. Therefore, the joint characteristics of the joint can be ensured.

[Effect of the first embodiment]
When the dissimilar metal bonding material of the first embodiment is rolled in the longitudinal direction, the first metal plates 10 arranged on both sides are elongated relatively more than the second metal plate 20 arranged therebetween. For this reason, the dissimilar metal bonding material is applied to the second metal plate 20 arranged between the first metal plates 10 on both sides, which are relatively elongated, from both sides in the longitudinal direction. Rolled. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

Also, the second metal plate 20 arranged in between spreads relatively larger than the first metal plates 10 arranged on both sides thereof. Therefore, while the dissimilar metal bonding material spreads relatively large, the second metal plate 20 exerts a compressive stress in the width direction from the center on the first metal plates 10 arranged on both sides of the second metal plate 20. Rolled. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

In the first embodiment, the joining is friction stir joining performed by inserting a rotating tool 40 into the first metal plate 10 . Friction stir welding performed by inserting a rotary tool 40 into the first metal plate 10 is structurally difficult to join thin plates. Therefore, with thin plates, even if friction stir welding was desired depending on the characteristics of the joint 30, it was not possible. By the above-described rolling method, it is possible to obtain a thin plate by rolling the dissimilar metal bonding material. That is, friction stir welding can be selected according to the characteristics of the joint 30, and a thin plate can be obtained by subsequent rolling.

<Second Embodiment> FIG. 4 is a plan view for explaining a second embodiment of the dissimilar metal bonding material and the rolling method thereof according to the present invention.

[Dissimilar metal bonding material]
The dissimilar metal bonding material of the second embodiment includes a second metal plate 20 having a relatively small elongation during rolling on both sides and a first metal plate 10 having a relatively large elongation between them. A joint portion 30 is formed by arranging and joining as described above.

In addition, the dissimilar metal bonding material of the present embodiment includes the second metal plate 20 having a relatively large expansion ratio during rolling on both sides, and the first metal plate 10 having a relatively small expansion ratio between them. , and a joint portion 30 is formed by the above-described joining.

Other than that, it is the same as that of the said 1st Embodiment.

[Joining method]
2nd Embodiment can also employ the joining method by friction stir welding.

In the second embodiment, the first metal plate 10 into which the rotary tool 40 is inserted is arranged between the second metal plates 20 on both sides. Accordingly, processing regions 32 are formed along the inner sides of both joints 30 .

Other than that, it is the same as that of the said 1st Embodiment.

[Rolling method]
Also in the second embodiment, a dissimilar metal bonding material in which two types of metal plates 10 and 20 of different types are arranged in the width direction and bonded is rolled in the longitudinal direction.

Then, in the rolling, the second metal plate 20 having a relatively small elongation rate during rolling is arranged on both sides, and the first metal plate 10 having a relatively large elongation rate is arranged between them, and the bonding is performed. I do.
In the rolling, the second metal plate 20 having a relatively large expansion ratio during rolling is arranged on both sides, and the first metal plate 10 having a relatively small expansion ratio is arranged between them, and the bonding is performed. I do.

Other than that, it is the same as that of the said 1st Embodiment.

[Effect of Second Embodiment]
When the dissimilar metal bonding material of the second embodiment is rolled in the longitudinal direction, the first metal plates 10 arranged therebetween are elongated relatively more than the second metal plates 20 on both sides. Therefore, in the dissimilar metal bonding material, the second metal plates 20 having a relatively small elongation rate placed on both sides are compressed in the longitudinal direction from both sides with respect to the first metal plate 10 placed therebetween. Rolled while applying stress. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

In addition, the second metal plates 20 arranged on both sides spread relatively larger than the first metal plate 10 arranged therebetween. For this reason, the dissimilar metal bonding material is formed while the second metal plates 20 on both sides, which are relatively widely spread, apply a compressive stress in the width direction from both sides to the first metal plate 10 arranged therebetween. Rolled. Therefore, it is possible to effectively prevent the dissimilar metal bonding material from bending when rolled. It does not require strict and complicated process control compared to the conventional method, and can be easily realized industrially.

Other than that, the same effects as those of the first embodiment are obtained.

A copper plate as the second metal plate 20 is arranged on both sides, and an aluminum plate as the first metal plate 10 is arranged between them to form the joint 30 by the above-mentioned joining to obtain a dissimilar metal joint material under the following conditions. Rolled it.
(rolling conditions)
Cold rolling was performed under the following conditions.
Thickness before rolling: 4mm
Thickness after rolling: 0.8 mm
Reduction rate: 80%

FIG. 5 is an appearance photograph of a rolled material of the dissimilar metal bonding material obtained as described above. It can be seen that the dissimilar metal bonding material is effectively prevented from bending when rolled.

Comparative example

FIG. 6 is an appearance photograph of a rolled dissimilar metal bonding material in which a copper plate and an aluminum plate are arranged one by one on the left and right and joined together.
Since the elongation rate of the aluminum plate is greater than that of the copper plate, it can be seen that the aluminum plate is greatly curved in the longitudinal direction.

FIG. 7 is a cross-sectional microphotograph of the vicinity of the joint 30 of a rolled dissimilar metal joint material obtained by joining a copper plate and an aluminum plate by friction stir welding.
It can be seen that the copper-aluminum compound layer formed during the friction stir welding process is crushed by the rolling to form a copper-aluminum direct joint.

[Modification]
Although particularly preferred embodiments of the present invention have been described above, the present invention is not intended to be limited to the illustrated embodiments, and can be implemented in various ways, and the present invention includes various modifications. It is the intention to

For example, in the above-described embodiment, the friction stir welding method is applied as a method for forming the joint portion 30, but the present invention is not limited to this, and various joining methods can be applied.

10: first metal plate 20: second metal plate 30: joint portion 32: processing area 40: rotary tool 50: rolling roll

Claims (15)

A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
A first metal plate having a relatively large elongation rate during rolling is arranged on both sides, and a second metal plate having a relatively small elongation rate is arranged between them, and the joining is performed. A rolling method for metal bonding materials. A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
A first metal plate having a relatively small expansion ratio during rolling is placed on both sides, and a second metal plate having a relatively large expansion ratio is arranged between them, and the joining is performed. A rolling method for metal bonding materials. A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
A second metal plate having a relatively small elongation rate during rolling is placed on both sides, and the first metal plate having a relatively large elongation rate is arranged between them, and the joining is performed. A rolling method for metal bonding materials. A method of longitudinally rolling a dissimilar metal bonding material obtained by arranging and bonding two types of metal plates of different types in the width direction, the method comprising:
In the above rolling,
A second metal plate having a relatively large expansion ratio during rolling is arranged on both sides, and the first metal plate having a relatively small expansion ratio is arranged between them, and the joining is performed. A rolling method for metal bonding materials. The method for rolling dissimilar metals to be joined according to any one of claims 1 to 4, wherein the joining is friction stir welding performed by inserting a rotary tool into the first metal plate. 6. A compound layer of the first metal and the second metal formed during the friction stir welding is crushed by the rolling to form a direct joint between the first metal and the second metal. A rolling method for the dissimilar metal bonding material described. 7. The rolling method for dissimilar metal bonding material according to claim 5 or 6, wherein the first metal plate on the side into which the rotary tool is inserted is made of a metal having a hardness lower than that of the second metal plate. 7. The method of rolling a dissimilar metal bonding material according to claim 5, wherein said first metal plate on the side into which said rotary tool is inserted is made of a metal having a melting point lower than that of said second metal plate. A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A first metal plate having a relatively large elongation during rolling is arranged on both sides, and a second metal plate having a relatively small elongation is arranged therebetween to form a joint portion by the above-mentioned joining. A dissimilar metal bonding material characterized by: A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A first metal plate having a relatively small expansion ratio during rolling is arranged on both sides, and a second metal plate having a relatively large expansion ratio is arranged therebetween to form a joint portion by the above-mentioned joining. A dissimilar metal bonding material characterized by: A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A second metal plate having a relatively small elongation rate during rolling is arranged on both sides and the first metal plate having a relatively large elongation rate is arranged therebetween to form a joint portion by the above-mentioned joining. A dissimilar metal bonding material characterized by: A dissimilar metal bonding material for rolling in the longitudinal direction a material obtained by arranging and bonding two types of metal plates of different types in the width direction,
A second metal plate having a relatively large expansion ratio during rolling is arranged on both sides, and a first metal plate having a relatively small expansion ratio is arranged between them to form a joint portion by the above bonding. A dissimilar metal bonding material characterized by: The dissimilar metal joining material according to any one of claims 9 to 12, wherein the joining portion is a joining portion by friction stir welding performed by inserting a rotary tool into the first metal plate. 14. The dissimilar metal bonding material according to claim 13, wherein the first metal plate on the side into which the rotary tool is inserted is a metal having a hardness lower than that of the second metal plate. 14. The dissimilar metal bonding material according to claim 13, wherein the first metal plate on the side into which the rotary tool is inserted is a metal having a melting point lower than that of the second metal plate.

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