WO2023119705A1

WO2023119705A1 - Method for manufacturing cladding material

Info

Publication number: WO2023119705A1
Application number: PCT/JP2022/028366
Authority: WO
Inventors: 優哉原; 紀智八木
Original assignee: 株式会社プロテリアル
Priority date: 2021-12-22
Filing date: 2022-07-21
Publication date: 2023-06-29
Also published as: JP2023092721A

Abstract

Provided is a method for manufacturing a cladding material that increases peeling resistance by suppressing entry of rolling oil into a bonding surface, and that preferably has bending-induced peeling resistance which less likely causes peeling during bending.　This method for manufacturing a cladding material incudes: a step for preparing a first metal sheet comprising a first metal, a second metal sheet comprising a second metal different from the first metal, and a third metal sheet comprising a third metal; a step for carrying out rolling in a state in which the second metal sheet is sandwiched between the first metal sheet and the third metal sheet so that the rolling surface of the second metal sheet is not exposed, thereby forming a rolled cladding material comprising a first metal layer comprising the first metal, a second metal layer comprising the second metal, and a third metal layer comprising the third metal; and a step for removing the third metal layer from the rolled cladding material. The second metal layer exists on one rolling-surface side in the thickness direction, and the second metal layer does not exist on the other rolling-surface side in the thickness direction.

Description

Clad material manufacturing method

This invention relates to a clad material manufacturing method.

Battery packs are installed in equipment such as various automobiles and electronic devices. A battery pack is configured as a battery group in which a plurality of battery cells are connected in series, and further configured as a larger battery group in which a plurality of battery cells are connected in parallel, as required. Battery cells, battery groups, and battery packs have positive and negative electrodes, and the positive and negative electrodes are interconnected by wiring components. In general, aluminum (Al) is used for a positive electrode terminal, and copper (Cu) is used for a negative electrode terminal. Therefore, a clad material composed of an Al layer and a Cu layer is suitable for the wiring component.

In addition, many semiconductor devices are installed in equipment such as various automobiles and electronic equipment. A semiconductor device is highly integrated, multi-layered, or has a large current, as required. Therefore, the amount of heat generated when energized increases, and a large amount of heat generated by energization is configured to escape to the outside of the device. For example, heat dissipating parts that impart thermal conductivity to a chassis that requires mechanical strength, heat dissipating parts that impart mechanical strength to support parts that require thermal conductivity, and the like are used. Therefore, a clad material composed of a Cu layer with good thermal conductivity and an iron (Fe) layer or a stainless steel (SUS) layer with good mechanical strength is suitable for the above heat dissipation component.

A clad material that is considered suitable for the wiring component is disclosed in Patent Document 1, for example. In Patent Document 1, a side end face of a first metal plate made of aluminum (Al) or an Al alloy and a side end face of a second metal plate made of copper (Cu) or a Cu alloy are rolled and joined by rolling rolls. A formed parallel clad plate (cladding material) is disclosed. In this clad material, each side end surface of the first metal plate and the second metal plate is a surface (inclined surface) inclined with respect to the rolling width direction, and one convex portion (or concave portion) formed on each inclined surface and the other recess (or projection) in combination, and can be formed by a method of rolling and bonding with rolling rolls. This clad material is formed by forming the joint surface (side end surface) between the first metal plate (first metal layer) and the second metal plate (second metal layer) into an uneven inclined surface, thereby It is intended to improve the properties (separation resistance).

In addition, a clad material that is considered suitable for the above heat dissipation component is disclosed in Patent Document 2, for example. In Patent Document 2, a plurality of metal plates such as aluminum (Al), copper (Cu), steel (Fe), or stainless steel (SUS) are combined in a desired arrangement and rolled and joined by rolling rolls. A clad metal composite (clad material) is disclosed. This clad material is made by forming a plurality of metal squares with square cross-sections from a plurality of metal plates of desired materials, and by combining the plurality of metal squares in a desired arrangement, it is possible to select the function and characteristics of the clad material. ing.

In recent years, the above-mentioned wiring parts and heat dissipation parts are required to have durability and reliability against more severe vibrations and impacts. Further, recently, in order to cope with the complicated and diversified shapes of equipment using wiring parts and heat dissipation parts, cases of bending wiring parts and heat dissipation parts are increasing. Therefore, there is a demand for a clad material suitable for wiring parts and heat-dissipating parts, which has high peeling resistance (bending peeling resistance) that can be bent.

Japanese Patent No. 4780664 Japanese Patent Publication No. 2018-517567

In the clad material disclosed in Patent Document 1, the joint edge between the first metal layer and the second metal layer is exposed on the surface in the thickness direction. The clad material disclosed in Japanese Unexamined Patent Application Publication No. 2002-200002 also has the same configuration in which the joint end portion is exposed on the surface in the thickness direction. In rolling bonding using general rolling rolls, rolling oil (lubricating oil) is supplied for the purpose of reducing friction between the material to be rolled (metal plate) and rolling rolls and imparting cooling properties. Therefore, there is a possibility that the rolling oil may enter between the joint surface (side end surface) of the first metal plate and the joint surface (side end surface) of the second metal plate during roll joining. If the rolling oil penetrates between the joint surfaces, there is a possibility that the joint interface between the first metal layer and the second metal layer will undergo some deterioration. Such deterioration of the joint interface causes a decrease in the joint strength between the layers of the clad material.

In addition, in the clad material disclosed in Patent Document 1, the joint end portion of the first metal layer in the rolling width direction and the joint end portion of the second metal layer in the rolling width direction are pointed in a triangular shape. Since the thickness of the triangular sharp portion (pointed head) of the joint end is extremely small, there is a possibility that sufficient joint strength cannot be obtained at the joint end. As a result, the clad material disclosed in Patent Literature 1 may have peeling at the joint end portion during bending.

In addition, the side end face that becomes the joint surface in the rolling width direction of the clad material disclosed in Patent Document 2 is a surface perpendicular to the rolling width direction of the metal square bar, unlike the inclined surface of the clad material disclosed in Patent Document 1. (vertical plane). This vertical plane is positioned parallel to the rolling direction of the rolling rolls (thickness direction of the metal plate). Therefore, the rolling force (component of force) necessary for joining the vertical surfaces is less likely to act, and there is a possibility that the joint ends of the vertical surfaces will not be joined or sufficient joint strength cannot be obtained. As a result, the clad material disclosed in Patent Literature 2 may have an unjoined portion at the joint end, or peeling may occur at the joint end during bending.

An object of the present invention is to suppress the infiltration of rolling oil into the joint surface and improve the peeling resistance, and more preferably, to have bending peeling resistance that makes peeling less likely to occur during bending. It is to provide a clad material manufacturing method that is possible.

In order to improve the delamination resistance and bending delamination resistance of the clad material, the inventor repeatedly made prototypes of clad materials with various structures, and found that the first metal plate (first metal layer) and the second metal plate (second The bonding interface with the metal layer) was thoroughly examined. In particular, focusing on the joint form and joint properties of the joint end where the joint interface is exposed on the surface and the vicinity thereof, the rolling rolls are not brought into direct contact with the joint end of the first metal plate and the second metal plate. At the same time, with the idea of limiting the deformation in the rolling width direction near the joint end of the first metal plate and the second metal plate, the product portion (cladding material) The inventors have found that the above-mentioned problems can be solved by means of roll-bonding the dummy portion to the joint, and have conceived of the present invention.

A clad material manufacturing method according to the present invention comprises a first metal plate made of a first metal, a second metal plate made of a second metal different from the first metal, and a third metal plate made of a third metal. and rolling the second metal plate while sandwiching the second metal plate between the first metal plate and the third metal plate so as not to expose the rolled surface of the second metal plate; forming a clad rolled material comprising a first metal layer made of a metal, a second metal layer made of the second metal, and a third metal layer made of the third metal; and removing the third metal layer, wherein the second metal layer exists on one rolled surface side in the thickness direction, and the second metal layer exists on the other rolled surface side in the thickness direction. form a cladding material in the absence of

In this invention, the first metal plate and the third metal plate having a length in the rolling width direction larger than that of the second metal plate are prepared, and the length in the rolling width direction is smaller than that of the first metal layer. A clad material can be formed in which the second metal layer exists on one rolled surface side in the thickness direction and the second metal layer does not exist on the other rolled surface side in the thickness direction.

In the present invention, in the step of forming the clad rolled material, it is preferable to roll at a rolling reduction of 65% or more.

In the present invention, it is preferable to select, as the third metal, a metal having a hardness difference of 100 HV or less between the first metal plate and the second metal plate in contact with the third metal plate.

In the present invention, the third metal is preferably any one of Al, Al alloy, Cu, Cu alloy, Fe, and Fe alloy.

In the present invention, one of the first metal and the second metal may be Al or an Al alloy, and the other may be Cu or a Cu alloy.

In the present invention, one of the first metal and the second metal may be Cu or a Cu alloy, and the other may be Fe or an Fe alloy, or stainless steel.

According to the present invention, it is possible to suppress the infiltration of rolling oil into the joint surface and improve the peeling resistance. It is possible to provide a clad material manufacturing method.

It is a figure which shows the flow of the process of the manufacturing method of the clad material which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structural example (inlay type|mold) of 1st Embodiment of the clad rolled material which concerns on this invention. It is a figure which shows the structural example (inlay type) of 1st Embodiment of the clad material which concerns on this invention. It is a figure which shows the structural example (edge lay type|mold) of 2nd Embodiment of the clad rolled material which concerns on this invention. FIG. 6 is a diagram showing a configuration example (edge lay type) of a clad material according to a second embodiment of the present invention; FIG. 10 is a view showing a configuration example (edge lay type modification) of a third embodiment of the clad rolled material according to the present invention; FIG. 10 is a diagram showing a configuration example (edge-ray type modification) of a clad material according to a third embodiment of the present invention; Shown is an enlarged cross section of a portion including a joint end of an inlay-type clad rolled material having a three-layer structure of Al layer-Cu layer (inlay layer)-Al layer (third metal layer), which is an example of the present invention. It is a diagram (map). Shown is an enlarged cross section of a portion including a joint end of an inlay-type clad rolled material having a three-layer structure of Al layer-Cu layer (inlay layer)-Cu layer (third metal layer), which is an example of the present invention. It is a diagram (map). FIG. 10 is an enlarged cross-sectional view (image) of a portion including a joint end portion of an inlay-type clad material having a two-layer structure of an Al layer and a Cu layer (inlay layer), which is an example of the present invention. FIG. 10 is a diagram (image) showing an enlarged cross section of a portion including a joint end portion of an inlay-type clad material having a two-layer structure of an Al layer and a Cu layer (inlay layer), which is a comparative example (comparative example 1). . FIG. 10 is a diagram (image) showing an enlarged cross section of a portion including a joint end portion of an inlay-type clad material having a two-layer structure of an Al layer and a Cu layer (inlay layer), which is a comparative example (comparative example 1). . FIG. 4 is a view (image) showing a cross section of an inlay-type clad material having a two-layer structure of an Al layer and a Cu layer (inlay layer) according to an example of the present invention after a bending test. FIG. 14 is a diagram (map) showing an enlarged cross section of the cross section shown in FIG. 13 and including one (Y2 side) joint end. FIG. 10 is a view (image) showing a cross section of an inlay-type clad material having a two-layer structure of an Al layer and a Cu layer (inlay layer) after a bending test as a comparative example (comparative example 2).

The method of manufacturing a clad material according to the present invention will be described with reference to the drawings as appropriate, citing several configuration examples of the clad material that can be manufactured by this manufacturing method. In addition, the clad material manufacturing method according to the present invention is not limited to the configuration examples illustrated here, but is indicated by the scope of the claims, and all modifications within the meaning and scope equivalent to the scope of the claims is included. The terms and symbols relating to the manufacturing method of the clad material may be used in common in the specification and drawings unless otherwise specified. For example, in FIG. 2, the first metal plate and the first metal layer are labeled "101", the second metal plate and the second metal layer are labeled "102", and the third metal plate and the third metal layer are labeled "102". "103" are shared respectively.

FIG. 1 shows the process flow of the clad material manufacturing method according to the present invention. As shown in FIG. 1, the clad material manufacturing method according to the present invention includes a metal plate preparation step, a clad rolled material formation step, and a metal layer removal step. At least three metal plates are prepared in the metal plate preparation step. In the clad rolled material forming step, a clad rolled material comprising at least three metal layers is formed. The metal layer removal step forms a cladding material comprising at least two metal layers. The thickness direction of the metal plate is the Z direction (see FIG. 2), the rolling width direction is the Y direction (see FIG. 2), and the rolling direction is the X direction (not shown).

<First Embodiment>
Regarding the method of manufacturing the clad material shown in FIG. 1, the inlay molds shown in FIGS.

A clad rolled material 100 shown in FIG. and are rolled and joined by rolling rolls. The second metal plate 102 becomes a core material (inlay core) located in the center of the clad rolled material 100 . As a result, a first metal layer 101 made of a first metal, a second metal layer 102 made of a second metal different from the first metal, and a third metal layer 103 made of a third metal, It consists of clad rolled material 100 . In this clad rolled material 100, the first metal layer 101 corresponds to the first metal plate 101, the second metal layer 102 corresponds to the second metal plate 102, and the third metal layer 103 corresponds to the third metal plate 103. do. Therefore, the second metal layer 102 becomes a core layer (inlay layer) located in the center of the clad rolled material 100 . In this clad rolled material 100, the first metal layer 101 and the second metal layer 102 constitute a product corresponding portion 100A, and the third metal layer 103 constitutes a dummy portion 100B.

In addition, the clad rolled material 100 shown in FIG. 2 has a second metal layer 102 on one rolled surface side (Z2 side) in the Z direction, and a second metal layer 102 on the other rolled surface side (Z1 side) in the Z direction. 2 metal layer 102 is not present. In this clad rolled material 100, a second metal layer 102 having a length in the Y direction smaller than that of the first metal layer 101 exists on one rolled surface side (Z2 side) in the Z direction, and the other rolled surface in the Z direction is present. The second metal layer 102 does not exist on the side (Z1 side). In this clad rolled material 100, neither one (Y1 side) side surface 102c nor the other (Y2 side) side surface 102c in the Y direction of the second metal layer 102 is exposed.

The clad material 10 shown in FIG. 3 corresponds to the product corresponding portion 100A of the clad rolled material 100 shown in FIG. The clad material 10 is composed of a first metal layer 11 made of a first metal and a second metal layer 12 made of a second metal different from the first metal. This clad material 10 has a second metal layer 12 on one rolled surface side (Z2 side) in the Z direction, and a second metal layer 12 on the other rolled surface side (Z1 side) of the first metal layer 11 in the Z direction. 2 metal layer 12 is not present.

In the clad material 10 shown in FIG. 3, the second metal layer 12 having a length in the Y direction smaller than that of the first metal layer 11 exists on one rolled surface side (Z2 side) in the Z direction. The second metal layer 12 does not exist on the other rolled surface side (Z1 side). In this clad material 10, neither one (Y1 side) side surface 12c nor the other (Y2 side) side surface 12c in the Y direction of the second metal layer 12 is exposed. Therefore, the second metal layer 12 becomes a buried layer (inlay layer) located in the center of the cladding material 10 in the Y direction.

The inlay-type clad material is not limited to the clad material 10 having the structure shown in FIG. According to the method of manufacturing the clad material shown in FIG. 1, for example, even in an inlay-type clad material having second metal layers with different lengths in the Y direction, the second metal layers with different thicknesses in the Z direction can be used. Even an inlay-type clad material having a layered structure can be manufactured by preparing a second metal plate corresponding to a desired second metal layer. According to the method of manufacturing the clad material shown in FIG. 1, for example, the second metal layer 12 is an inlay-type clad material in which the second metal layer 12 is located at one side (Y1 side) or the other side (Y2 side) in the Y direction. However, in the step of forming the clad rolled material 100, it can be manufactured by sending the second metal plate corresponding to the second metal layer to a desired position in the Y direction and rolling.

<Metal plate preparation process>
In the metal plate preparation step shown in FIG. 1, at least three metal plates, i.e., at least two metal plates for constituting the product part and at least one metal plate for facilitating the manufacture of the product part, are prepared. prepare. For example, regarding the clad rolled material 100 shown in FIG. A third metal plate 103 made of three metals is prepared.

When three metal plates are prepared as described above to form the clad rolled material 100 shown in FIG. The plate 103 has a length in the Y direction greater than that of the second metal plate 102 and equal to or less than that of the first metal plate 101 , preferably equal to that of the first metal plate 101 .

The dimensions and materials of the first metal plate 101 and the second metal plate 102 that constitute the product-corresponding portion 100A can be selected according to the application, function, etc., as desired. The materials of the first metal plate 101 and the second metal plate 102, that is, the first metal and the second metal are high-purity aluminum (Al) or Al alloy, high-purity copper (Cu) or Cu alloy, high-purity Iron (Fe) or Fe alloys, or stainless steel (SUS) can each be selected as desired. In addition to the above, high-purity nickel (Ni) or Ni alloys, high-purity titanium (Ti) or Ti alloys, Zn alloys, or Sn alloys can be applied as the first metal and the second metal.

For example, in applications such as the wiring components described above, such as secondary battery terminals, leads, and bus bars, emphasis is placed on electrical characteristics such as low volume resistivity, and one of the first metal and the second metal is selected. It is preferable to use Al or an Al alloy and the other to be Cu or a Cu alloy.

For example, in the application of the heat dissipation component described above, emphasis is placed on thermal characteristics such as high thermal conductivity, and one of the first metal and the second metal is Cu or a Cu alloy, Alternatively, stainless steel such as SUS304, SUS316L, and SUS430 is preferably used.

In addition, the dimensions of the third metal plate 103 that constitutes the dummy portion 100B of the clad rolled material 100 are at least in the Y direction, the second metal stacked on the opposite side (Z2 side) to the first metal plate 101 side (Z1 side). The dimensions are selected such that the rolled surface (upper surface 102a) of plate 102 is covered and not exposed. The material of the third metal plate 103, that is, the third metal, is relatively easy to overlap-roll with the first metal and the second metal, and is relatively easy to remove in the subsequent step of removing the metal layer shown in FIG. It is preferable to choose a metal, which is relatively inexpensive.

As the third metal, the compatibility with the first and second metals is met as desired, and the metal layer removal step shown in FIG. 1 is taken into consideration. , Cu such as C1020, Fe such as electroless iron, or Al alloys such as JIS standard 3000 series to 5000 series, Cu alloys such as brass, bronze and copper-nickel alloys, low carbon steel used for SPCC etc. A Fe alloy or the like can be selected. In addition to the above, the third metal may be high-purity nickel (Ni), high-purity titanium (Ti), Ni alloy, or Ti alloy, considering the difference in hardness between the first and second metals. , Zn alloys, Sn alloys, stainless steel (SUS), and the like can also be applied.

Further, the thickness of the third metal plate 103 is sufficiently small so that the dummy portion 100B (the third metal layer 103) can be easily removed in the subsequent metal layer removal step shown in FIG. preferable. However, if the thickness of the third metal plate 103 becomes excessively small, a large plastic instability phenomenon tends to occur during rolling, and the amount of compressive deformation of the third metal plate 103 in the Z direction tends to fluctuate greatly. If the thickness of the third metal layer 103 fluctuates greatly, the dummy portion 100B becomes largely wavy, and the bonding interface between the dummy portion 100B and the product corresponding portion 100A becomes uneven. If the bonding interface has an uneven shape, the product corresponding portion 100A is excessively removed along with the removal of the dummy portion 100B, which will be described later, which is not preferable. In order to avoid such a large plastic instability phenomenon during rolling, the difference between the hardness of the third metal plate 103 and the hardness of the first metal plate 101 and the second metal plate 102 in contact therewith should be made smaller. is preferred.

From this point of view, the third metal forming the third metal plate 103 is preferably a metal having a hardness difference of 100 HV or less between the first metal plate 103 and the second metal plate 102 in contact with the third metal plate 103. to select. Further, for convenience, the same metal as the one having lower hardness among the first metal plate 103 and the second metal plate 102 in contact with the third metal plate 103 can be selected as the third metal. In this case, considering the ease of rolling and the ease of removing the dummy portion 100B, it is preferable to set the thickness of the third metal plate 103 to, for example, 10 μm or more and 100 μm or less. By setting the difference in hardness between the first metal plate 101 and the second metal plate 102 in contact with the third metal plate 103 to 100 HV or less, the deformation resistance of the harder metal plate due to the difference in hardness during roll bonding is increased. increases, and the occurrence of plastic instability phenomenon in which the thickness of the metal layer constituting the clad rolled material fluctuates in an undulating manner is likely to be suppressed.

<Formation process of clad rolled material>
In the step of forming the clad rolled material shown in FIG. 1, at least three metal plates prepared in the step of preparing the metal plates are stacked in the Z direction and rolled with rolling rolls to join the metal plates by rolling. A clad roll consisting of two metal layers is formed. For example, regarding the clad rolled material 100 shown in FIG. With the plate 102 sandwiched, it is rolled by rolling rolls at a rolling reduction of preferably 65% or more (more preferably 67% or more).

Specifically, the first metal plate 101, the second metal plate 102, and the third metal plate 103 are set in a rolling device, and before they are sent to the rolling rolls, the first metal plate 101 rolls the third metal plate from the Z1 side. At 103, the lower surface 103b of the third metal plate 103 covers the upper surface 102a, which is the rolled surface of one side (Z2 side) of the second metal plate 102, on both sides of the second metal plate 102 in the Z direction. Then, bottom surface 101c and side surface 101d of first metal plate 101 cover lower surface 102b and side surface 102c, which are rolled surfaces on the other side (Z1 side) of second metal plate 102, respectively. Then, the third metal plate 103 is sandwiched between the first metal plate 101 and the second metal plate 102 so as not to expose the upper surface 102a and the lower surface 102b, which are the rolling surfaces of the second metal plate 102, under the rolling rolls. It is preferably rolled at a rolling reduction of 65% or more (more preferably 67% or more) while being sent to rolling rolls. The fact that it is preferable to roll at a rolling reduction of 65% or more (more preferably 67% or more) will be described later with examples.

By the above-described rolling method, the upper surface 102a of the second metal plate 102 is covered with the third metal plate 103, and the lower surface 102b and both side surfaces 102c are covered with the first metal plate 101 before being sent to the rolling rolls and below the rolling rolls. covered. Therefore, when forming the clad rolled material 100 shown in FIG. 2, the second metal plate 102 can be rolled without exposing all the outer peripheral surface including the joint end 100a with the first metal plate 101. This prevents the rolling oil from entering between the side surface 101d of the first metal plate 101 and the side surface 102c of the second metal plate 102 from the joint end portion 100a of the first metal plate 101 and the second metal plate 102. 100 A of product correspondence parts can be formed while carrying out.

As described above, in the step of forming the clad rolled material shown in FIG. The upper surface 102a of the second metal plate 102 where the joint end 100a exists is covered with the lower surface 103b of the third metal plate 103 and is not exposed. Therefore, the rolling can be performed in a state in which the joint end portion 100a of the upper surface 102a of the second metal plate 102 to the first metal plate 101 is not exposed. As a result, the first metal plate 101 and the second metal plate 102 are rolled and joined by the rolling rolls while suppressing the infiltration of rolling oil that may reduce the bonding strength between the layers of the clad material 10 shown in FIG. can do.

Here, in the conventional general rolling method, the first metal plate 101 and the second metal plate 102 are used when forming the clad material 10 shown in FIG. Therefore, under the rolling rolls, in a state in which the rolling rolls are in contact with the upper surface 101a and the lower surface 101b of the first metal plate 101 and the upper surface 102a of the second metal plate 102, a large pressure in the Z direction (hereinafter referred to as "rolling force ) works. Due to the rolling force acting in the Z direction, the first metal plate 101 and the second metal plate 102 are stretched and deformed in the Z direction, and at the same time, are stretched and deformed in the X direction, and are also stretched and deformed in the Y direction. It spreads and transforms. At this time, since the third metal plate 103 is not used, rolling oil is interposed between the rolling rolls and the upper surface 101a of the first metal plate 101 and the upper surface 102a of the second metal plate 102 . Due to the lubricating action of this rolling oil, the frictional force generated between the rolling rolls and the upper surface 101a of the first metal plate 101 and the upper surface 102a of the second metal plate 102 is sufficiently reduced. The drag force generated to limit the deformation of the two metal plates 102 as they are spread in the Y direction is also sufficiently small. When the drag acting in the Y direction decreases, the stress that causes the first metal plate 101 to spread outward in the Y direction relatively increases. The stress in the Y direction that contributes to the bonding with the two metal plates 102 is relatively small. When the stress in the Y direction that contributes to the bonding is small in this way, the bonding strength of the clad material 10 near the bonding end portion 10a is difficult to improve.

On the other hand, in the rolling method according to the present invention, as shown in FIG. 2, the third metal plate 103 is brought into contact with the first metal plate 101 and the second metal plate 102 while being stacked in the Z direction. Therefore, under the rolling rolls, a large rolling force acts in the Z direction while the lower surface 103b of the third metal plate 103 is in contact with the upper surface 101a of the first metal plate 101 and the upper surface 102a of the second metal plate 102. . Due to the rolling force acting in the Z direction, the first metal plate 101, the second metal plate 102 and the third metal plate 103 are stretched and deformed in the Z direction, and at the same time are stretched and deformed in the X direction. At the same time, it is extended and deformed in the Y direction as well. At this time, since the third metal plate 103 is used, the rolling oil enters between the lower surface 103b of the third metal plate 103 and the upper surface 101a of the first metal plate 101 and the upper surface 102a of the second metal plate 102. is suppressed. Therefore, a relatively large frictional force is generated between the lower surface 103b of the third metal plate 103 and the upper surface 101a of the first metal plate 101 and the upper surface 102a of the second metal plate 102. A relatively large drag force is generated that limits the deformation of the metal plate 102 as it spreads in the Y direction. Thus, in the rolling method using the third metal plate 103, the drag acting in the Y direction is greater than in the conventional rolling method. Therefore, in the vicinity of the joint end portion 100a, the stress in the Y direction that contributes to the joint between the first metal plate 101 and the second metal plate 102 becomes relatively large, and the joint strength at the joint end portion 10a of the clad material 10 is improved. can contribute to

It should be noted that the clad material (the product corresponding portion of the rolled clad material) according to the present invention is not limited to the two-layer structure shown in FIG. 3 (the two-layer structure product corresponding portion 100A shown in FIG. 2). The clad material according to the present invention can also have a layered structure of three or more layers. For example, one or more metal layers are inserted between the first metal layer 101 and the second metal layer 102 shown in FIG. 2, and one metal layer is inserted between the first metal layer 11 and the second metal layer 12 shown in FIG. A configuration having more than one metal layer is also possible. Further, for example, one or more metal layers are inserted on the lower surface 101b side (Z1 side) of the first metal layer 101 shown in FIG. A configuration having more than one metal layer is also possible. Also, for example, one or more metal layers are inserted on the upper surface 102a side (Z2 side) of the second metal layer 102 shown in FIG. It is also possible to have a configuration having more than one metal layer, that is, to configure the second metal layer 12 itself in multiple layers. The modified example of the layer structure of the clad material described above can also be applied to an edge-ray type (second embodiment) and a modified edge-ray type (third embodiment), which will be described later.

Also, the clad material (product-corresponding portion of the rolled clad material) according to the present invention is not limited to the configuration in which the inlay core (second metal layer 12) shown in FIG. 3 is one. The clad material according to the present invention can also be configured by arranging two or more inlay cores in the Y direction. In this case, all the inlay cores can be made of the same material or different materials, or some inlay cores can be made of different materials.

In addition, the clad material (the part corresponding to the product of the clad rolled material) according to the present invention is a combined use of the inlay type and the edge lay type (second embodiment), and a modified example of the inlay type and the edge lay type (third embodiment). A combined use with is also possible. That is, in the Y direction, one or two or more inlay cores and one or two edge lay cores can be arranged at the same time.

In the method for manufacturing the clad material shown in FIG. 1, the clad rolled material 100 shown in FIG. Diffusion annealing is performed under the following conditions. Clad rolled material 100 that has been diffusion annealed under appropriate conditions has a composition of each metal layer at the bonding interfaces of the first metal layer 101, the second metal layer 102 and the third metal layer 103 that constitute the clad rolled material 100. A moderate amount of intermetallic compounds based on An intermetallic compound appropriately generated at the bonding interface can form an intermetallic compound layer with an appropriate thickness. The clad rolled material 100 in which an intermetallic compound layer having an appropriate thickness is formed between each metal layer has a further improved mechanical strength (bonding strength between metal layers). As a result, the mechanical strength (joining strength between metal layers) of the clad material 10, which is the product corresponding portion 100A after removing the dummy portion 100B from the clad rolled material 100, is further improved.

In the clad rolled material 100 shown in FIG. 1, the clad rolled material 100 shown in FIG. Thickness, hardness, surface roughness, etc. can be adjusted. Such finish rolling can be performed in the middle of the metal layer removing step, which will be described later, or after the metal layer removing step.

<Step of removing metal layer>
In the step of removing the metal layer shown in FIG. 1, the clad material that will become the product is formed by removing the metal layer from the clad rolled material other than the part corresponding to the product. For example, regarding the clad rolled material 100 shown in FIG. The second metal layer 102 remains. Thereby, the clad material 10 shown in FIG. 3 can be formed from the clad rolled material 100 shown in FIG. In addition, in the step of removing the metal layer, the metal layer can be removed in multiple steps.

Here, the means for removing the metal layer can be, for example, mechanical polishing using a cylindrical whetstone, a flat whetstone, or a buff made of stainless steel wire, or electrochemical polishing corresponding to the material of the metal layer. It is preferable to appropriately select the means for removing the metal layer according to the requirements, such as the material of the metal layer forming the rolled clad material, the function and application of the clad material, and the manufacturing equipment. For example, when manufacturing a long clad material, it is preferable to select mechanical polishing, which requires relatively simple manufacturing equipment and can be expected to be mass-producible and inexpensive.

As described above, according to the clad material manufacturing method of the present invention, the rolling oil flows from the joint end 100a between the first metal plate 101 and the second metal plate 102 to the side surface 101d of the first metal plate 101 and the second metal plate. The part 100</b>A corresponding to the product of the clad rolled material 100 can be formed while suppressing penetration between the side surface 102 c of the plate 102 . As a result, the mechanical strength of the product corresponding portion 100A, in particular, the bonding strength of the bonding layers (side surfaces 101d and 102c) in the Y direction between the first metal layer 101 and the second metal layer 102 can be sufficiently improved. can. As a result, the product corresponding portion 100A after removing the dummy portion 100B, that is, the clad material 10 is sufficient for the bonding layers (side surfaces 11d and 12c) of the first metal layer 11 and the second metal layer 12 in the Y direction. The joint strength is obtained, and in particular, the joint strength of the joint end portion 10a exposed on one surface (Z2 side) of the clad material 10 is improved. Peelability is sufficiently improved. In addition, the clad material 10 formed by rolling and joining with a reduction ratio of 65% or more with a rolling roll can have a resistance to bending peeling, which makes peeling less likely to occur during bending. This point will be described later.

Further, as described above, in the clad material manufacturing method according to the present invention, the third metal layer 102 (inlay core) constituting the product corresponding portion 100A corresponding to the clad material 10 is not exposed to the rolled surface 102a. The clad material 10 can be formed by a simple means of removing the third metal layer 103 (dummy part 100B) after forming the clad rolled material 100 by stacking the metal plates 103 (dummy part 100B). Therefore, as in the clad materials disclosed in Patent Documents 1 and 2, means for forming uneven joint surfaces (side end surfaces) of the first metal plate and the second metal plate, or a plurality of metal squares with a square cross section are used. The cladding material 10 shown in FIG. 3, which is composed of the first metal layer 11 and the second metal layer 12, can be formed without using forming and arranging means.

<Second embodiment>
Regarding the method of manufacturing the clad material shown in FIG. 1, the edge lay type shown in FIGS. 4 and 5 is given as an example of the configuration of the rolled clad material and the clad material. In addition, the clad rolled material and clad material referred to as the edge-lay type in the present invention are intended to have a form in which the second metal layer overlaps on one side (Z2 side) in the thickness direction (Z direction) of the first metal layer. .

A clad rolled material 200 shown in FIG. 4 includes a first metal plate 201 made of a first metal, a second metal plate 202 made of a second metal different from the first metal, and a third metal plate 203 made of a third metal. and are rolled and joined by rolling rolls. The second metal plate 202 becomes a core portion (edge lay core) positioned at the Y1 side edge of the clad rolled material 200 . As a result, a first metal layer 201 made of a first metal, a second metal layer 202 made of a second metal different from the first metal, and a third metal layer 203 made of a third metal, It consists of clad rolled material 200 . In this clad rolled material 200, the first metal layer 201 corresponds to the first metal plate 201, the second metal layer 202 corresponds to the second metal plate 202, and the third metal layer 203 corresponds to the third metal plate 203. do. Therefore, the second metal layer 202 becomes a core layer (edge lay layer) positioned at the Y1 side edge of the clad rolled material 200 . In this rolled clad material 200, the first metal layer 201 and the second metal layer 202 constitute a product corresponding portion 200A, and the third metal layer 203 constitutes a dummy portion 200B.

The clad rolled material 200 shown in FIG. 4 has a second metal layer 202 on one rolled surface side (Z2 side) in the Z direction, and a second metal layer 202 on the other rolled surface side (Z1 side) in the Z direction. 2 metal layer 202 is not present. In this clad rolled material 200, a second metal layer 202 having a length in the Y direction smaller than that of the first metal layer 201 is present on one rolled surface side (Z2 side) in the Z direction, and the other rolled surface in the Z direction is present. The second metal layer 202 does not exist on the side (Z1 side). In this clad rolled material 200, one (Y1 side) side surface 202c in the Y direction of the second metal layer 202 is exposed, and the other side (Y2 side) is exposed, unlike the configuration example of the first embodiment (see FIG. 2). ) is not exposed.

The clad material 20 shown in FIG. 5 corresponds to the product corresponding portion 200A of the clad rolled material 200 shown in FIG. The clad material 20 is composed of a first metal layer 21 made of a first metal and a second metal layer 22 made of a second metal different from the first metal. This clad material 20 has a second metal layer 22 on one rolled surface side (Z2 side) in the Z direction, and a second metal layer 22 on the other rolled surface side (Z1 side) in the Z direction. not. In this clad material 20, the second metal layer 22 having a length in the Y direction smaller than that of the first metal layer 21 is present on one rolled surface side (Z2 side) in the Z direction, and the other rolled surface side in the Z direction is present. The second metal layer 22 does not exist on (Z1 side). In this cladding material 20, one (Y1 side) side surface 22c in the Y direction of the second metal layer 22 is exposed, and the other side (Y2 side) is exposed, unlike the configuration example of the first embodiment (see FIG. 3). is not exposed. Therefore, the second metal layer 12 becomes a buried layer (inlay layer) positioned at the Y1 side edge of the clad material 10 .

Note that the edge-lay type clad material is not limited to the clad material 20 having the configuration shown in FIG. According to the clad material manufacturing method shown in FIG. 1, for example, even in an edge-lay type clad material having a configuration including second metal layers with different lengths in the Y direction, the second metal layers with different thicknesses in the Z direction Even an edge-lay type clad material having a layered structure can be manufactured by preparing a second metal plate corresponding to a desired second metal layer. According to the method of manufacturing the clad material shown in FIG. 1, for example, even if the clad material is edge-lay type clad material in which the second metal layer is located on the other side of the Y direction (Y2 side), the clad rolled material 200 is formed. 3, the second metal plate corresponding to the second metal layer is sent to a desired position in the Y direction and rolled.

In the following, when describing the manufacturing method of the configuration example of the second embodiment, the differences from the manufacturing method of the configuration example of the first embodiment (see FIGS. 2 and 3) will be mainly described, and the same important matters are omitted or explained briefly.

The configuration example of the second embodiment according to the present invention, for example, the clad rolled material 200 shown in FIG. 4 and the clad material 20 shown in FIG. 5 can be manufactured by the clad material manufacturing method shown in FIG.

First, in the metal plate preparation step, a first metal plate 201 made of a first metal, a second metal plate 202 made of a second metal different from the first metal, and a third metal plate 203 made of a third metal. , to prepare. At this time, the first metal plate 201 and the second metal plate 202 are prepared to have a shape and dimensions corresponding to the clad rolled material 200 shown in FIG. Also, the third metal plate 203 has a Y-direction length greater than that of the second metal plate 202 and equal to or less than that of the first metal plate 201 , preferably equal to that of the first metal plate 201 . Other matters such as the material of the metal plate may be substantially the same as in the configuration example of the first embodiment.

Next, in the step of forming the clad rolled material, the first metal plate 201, the second metal plate 202, and the third metal plate 203 prepared to correspond to the clad rolled material 200 in the metal plate preparation step are placed in a rolling mill. set. Then, both sides of the second metal plate 202 in the Z direction are sandwiched by the first metal plate 201 from the Z1 side and the third metal plate 203 from the Z2 side, respectively, before being sent to the rolling rolls. The lower surface 203b of the third metal plate 203 covers the upper surface 202a, which is the rolled surface on one side (Z2 side), and the lower surface 202b, which is the rolled surface on the other side (Z1 side), and the side surface 202d of the second metal plate 202 are covered by the first metal. The plate 201 is fed into the rolling rolls so that the bottom surface 201c and side surface 201d of the plate 201 are covered. At this time, the second metal plate 202 is sent to the rolling rolls so that the second metal plate 202 is positioned on the Y1 side in the Y direction. Then, the third metal plate 203 is sandwiched between the first metal plate 201 and the second metal plate 202 so that the upper surface 202a and the lower surface 202b, which are the rolling surfaces of the second metal plate 202, are not exposed under the rolling rolls. As in the case of the clad rolled material 100, it is preferably rolled at a reduction ratio of a predetermined value or more while being sent to the rolling rolls.

In the step of forming the clad rolled material, matters other than the above may be substantially the same as in the configuration example of the first embodiment described above. Diffusion annealing and finish rolling of the clad rolled material 200 may also be substantially the same as in the configuration example of the first embodiment.

As a result, the second metal plate 202 can be rolled without exposing the entire outer peripheral surface including the joint end 200a with the first metal plate 201, as in the configuration example of the first embodiment. can be done. Therefore, it is possible to form the product corresponding portion 200A while preventing the rolling oil from entering between the side surface 201d of the first metal plate 201 and the side surface 202d of the second metal plate 202 from the joint end portion 200a.

In addition, since the third metal plate 203 is used, the lower surface 203b of the third metal plate 203, the upper surface 201a of the first metal plate 201, and the second metal plate 201, as in the configuration example of the first embodiment. A relatively large frictional force is generated between the upper surface 202a of the plate 202 and a relatively large drag that limits the spreading deformation of the first metal plate 201 and the second metal plate 202 in the Y direction. Therefore, the compressive force in the Y direction that contributes to the bonding between the first metal plate 201 and the second metal plate 202 at the joint end portion 200a increases, and the joint strength at the joint end portion 20a of the clad material 20 (see FIG. 5) increases. can contribute to improvement.

Next, in the metal layer removing step, the dummy portion 200B (the third metal layer 203) is removed from the clad rolled material 200 formed in the clad rolled material forming step, and the first metal layer 201 and the first metal layer 201 as the product corresponding portion 200A are removed. Two metal layers 202 remain. Thereby, the clad material 20 shown in FIG. 5 can be formed. In the step of removing the metal layer, other items such as the means for removing the metal layer may be substantially the same as those in the configuration example of the first embodiment described above.

As described above, according to the clad material manufacturing method of the present invention, it is possible to form the product-corresponding portion 200A of the clad rolled material 200 while suppressing the intrusion of rolling oil from the joint end portion 200a. As a result, the mechanical strength of the product corresponding portion 200A, in particular, the bonding strength of the bonding layers (side surfaces 201d and 202d) in the Y direction between the first metal layer 201 and the second metal layer 202 can be sufficiently improved. can. As a result, the product corresponding portion 200A after removing the dummy portion 200B, that is, the clad material 20 is sufficiently bonded to the bonding layers (side surfaces 21d and 22d) of the first metal layer 21 and the second metal layer 22 in the Y direction. In particular, the joint strength of the joint end portion 20a exposed on the surface of one side (Z2 side) of the clad material 20 is improved, and the clad material formed by the conventional manufacturing method is resistant to peeling. performance is sufficiently improved. Further, similarly to the case of the clad material 10, the clad material 20 formed with a rolling reduction of a predetermined value or more can have preferable resistance to bending peeling.

In addition, as in the case of the clad material 10, as in the clad materials disclosed in Patent Documents 1 and 2, means for forming uneven joint surfaces (side end surfaces) of the first metal plate and the second metal plate, or The clad material 20 shown in FIG. 5, which is composed of the first metal layer 21 and the second metal layer 22, can be formed without using means for forming and arranging a plurality of metal squares having square cross sections. .

<Third Embodiment>
Regarding the method of manufacturing the clad material shown in FIG. 1, as a configuration example of the rolled clad material and the clad material, a modification of the edge-lay type shown in FIGS. 6 and 7 will be given. Note that the edge-lay type modification also intends a clad rolled material and a clad material having a form in which the second metal layer overlaps on one side (Z2 side) of the first metal layer in the thickness direction (Z direction).

A clad rolled material 300 shown in FIG. The plate 303 is rolled and joined by rolling rolls. The two second metal plates 302 become two cores (edge lay cores) positioned at the Y1 side edge and the Y2 side edge of the clad rolled material 300 . As a result, a first metal layer 301 made of a first metal, two second metal layers 302 made of a second metal different from the first metal, and a third metal layer 303 made of a third metal. In addition, it consists of clad rolling material 300 . In this clad rolled material 300, the first metal layer 301 corresponds to the first metal plate 301, the second metal layer 302 corresponds to the second metal plate 302, and the third metal layer 303 corresponds to the third metal plate 303. do. Therefore, the two second metal layers 302 become two core layers (edge lay layers) positioned at the Y1 side edge and the Y2 side edge of the clad rolled material 300 . In this rolled clad material 300, the first metal layer 301 and the two second metal layers 302 constitute a product corresponding portion 300A, and the third metal layer 303 constitutes a dummy portion 300B.

In addition, the clad rolled material 300 shown in FIG. 6 has two second metal layers 302 on one rolled surface side (Z2 side) in the Z direction, and has two second metal layers 302 on the other rolled surface side (Z1 side) in the Z direction. , the second metal layer 302 does not exist. In this clad rolled material 300, two second metal layers 302 having a length in the Y direction smaller than that of the first metal layer 301 are present on one rolling surface side (Z2 side) in the Z direction, and the other two in the Z direction. The second metal layer 302 does not exist on the rolled surface side (Z1 side). Unlike the configuration example of the second embodiment described above (see FIG. 4), this clad rolled material 300 exposes two side surfaces 302c of the two second metal layers 302 facing outward in the Y direction. The two inward facing sides 302d are not exposed.

The clad material 30 shown in FIG. 7 corresponds to the product corresponding portion 300A of the clad rolled material 300 shown in FIG. The clad material 30 is composed of a first metal layer 31 made of a first metal and two second metal layers 32 made of a second metal different from the first metal. This clad material 30 has two second metal layers 32 on one rolled surface side (Z2 side) in the Z direction, and a second metal layer 32 on the other rolled surface side (Z1 side) in the Z direction. does not exist. In this clad material 30, two second metal layers 32 having a length in the Y direction smaller than that of the first metal layer 31 are present on one rolling surface side (Z2 side) in the Z direction, and the other rolling surface in the Z direction is The second metal layer 32 does not exist on the surface side (Z1 side). Unlike the configuration example of the second embodiment described above (see FIG. 5), this cladding material 30 exposes two side surfaces 32c of the two second metal layers 32 facing outward in the Y direction, The two facing sides 32d are not exposed. Therefore, the two second metal layers 32 become two embedded layers (inlay layers) positioned at the Y1 side edge and the Y2 side edge of the cladding material 30 .

It should be noted that the modified clad material having two edge-lay type second metal layers is not limited to the clad material 30 having the configuration shown in FIG. According to the clad material manufacturing method shown in FIG. 1, for example, even an edge-lay type clad material having two second metal layers with different lengths in the Y direction has two different thicknesses in the Z direction. Even an edge-lay type clad material having two second metal layers can be manufactured by preparing two second metal plates corresponding to the two second metal layers.

Hereinafter, when describing the manufacturing method of the configuration example of the third embodiment, the configuration example of the first embodiment (see FIGS. 2 and 3) or the configuration example of the second embodiment (FIGS. 4 and 5). ) will be mainly described, and similar items will be omitted or briefly described.

The configuration example of the third embodiment according to the present invention, for example, the clad rolled material 300 shown in FIG. 6 and the clad material 30 shown in FIG. 7 can be manufactured by the clad material manufacturing method shown in FIG.

First, in the metal plate preparation step, a first metal plate 301 made of a first metal, two second metal plates 302 made of a second metal different from the first metal, and a third metal plate made of a third metal 303 and are prepared. At this time, the first metal plate 301 and the two second metal plates 302 are prepared to have a shape and dimensions corresponding to the clad rolled material 300 shown in FIG. The third metal plate 303 has a Y-direction length greater than that of the second metal plate 302 and equal to or less than that of the first metal plate 301 , preferably equal to that of the first metal plate 301 . Other items, such as the material of the metal plate, may be substantially the same as those in the configuration example of the first embodiment or the configuration example of the second embodiment. Note that the two second metal plates 302 that form the two edge lay cores are not limited to being made of the second metal. The two second metal plates 302 can be made of metals different from each other as desired, such as the application.

Next, in the step of forming the clad rolled material, the first metal plate 301, the two second metal plates 302, and the third metal plate 303 prepared to correspond to the clad rolled material 300 in the metal plate preparation step are rolled. set in the device. Then, before being sent to the rolling rolls, the two second metal plates 302 are sandwiched from the Z1 side with the first metal plate 301 and from the Z2 side with the third metal plate 303 to form two second metal plates 302 in the Z direction. The upper surface 302a that is the rolled surface of one (Z2 side) of the metal plate 302 is covered with the lower surface 303b of the third metal plate 303, and the lower surface 302b that is the rolled surface of the other (Z1 side) of the two second metal plates 302 and The side surface 302d is fed into the rolling rolls so that the bottom surface 301c and the side surface 301d of the first metal plate 301 are covered. At this time, one of the second metal plates 302 is positioned on the Y1 side in the Y direction, and the other second metal plate 302 is positioned on the Y2 side in the Y direction. Then, the third metal plate 303 is sandwiched between the first metal plate 301 and the second metal plate 302 so that the upper surface 302a and the lower surface 302b, which are the rolling surfaces of the two second metal plates 302, are not exposed under the rolling rolls. It is preferably rolled at a reduction rate equal to or higher than a predetermined value, similarly to the case of the clad rolled material 100, while being sent to the rolling rolls in this state.

In the step of forming the clad rolled material, matters other than the above may be substantially the same as those in the configuration example of the first embodiment or the configuration example of the second embodiment. Diffusion annealing and finish rolling of the clad rolled material 300 may also be substantially the same as in the configuration example of the first embodiment or the configuration example of the second embodiment.

As a result, as in the case of the configuration example of the first embodiment or the configuration example of the second embodiment, in a state in which all the outer peripheral surface including the joint end portion 300a with the first metal plate 301 is not exposed, Two second metal plates 302 can be rolled. Therefore, it is possible to form the product corresponding portion 300A while preventing the rolling oil from entering between the side surface 301d of the first metal plate 301 and the side surface 302d of the two second metal plates 302 from the joint end portion 300a. .

In addition, since the third metal plate 303 is used, the lower surface 303b of the third metal plate 303 and the first metal plate A relatively large frictional force is generated between the upper surface 301a of 301 and the upper surface 302a of the two second metal plates 302, causing the first metal plate 301 and the two second metal plates 302 to spread and deform in the Y direction. A relatively large limiting drag force is created. Therefore, the compressive force in the Y direction that contributes to the bonding between the first metal plate 301 and the second metal plate 302 at the joint end portion 300a increases, and the joint strength at the joint end portion 30a of the clad material 30 (see FIG. 7) increases. can contribute to improvement.

Next, in the metal layer removing step, the dummy portion 300B (the third metal layer 303) is removed from the clad rolled material 300 formed in the clad rolled material forming step, and the

first metal layers

301 and 2, which are the product corresponding portion 300A, are removed. One second metal layer 302 remains. Thereby, the clad material 30 shown in FIG. 7 can be formed. Other items such as the means for removing the metal layer may be substantially the same as those in the configuration example of the first embodiment or the configuration example of the second embodiment.

As described above, according to the clad material manufacturing method according to the present invention, it is possible to form the product corresponding portion 300A of the clad rolled material 300 while suppressing the intrusion of rolling oil from the joint end portion 300a. Therefore, the mechanical strength of the product corresponding portion 300A, particularly the bonding strength of the two bonding layers (side surfaces 301d and 302d) in the Y direction between the first metal layer 301 and the two second metal layers 302 is sufficiently improved. be able to. As a result, the product corresponding portion 300A after removing the dummy portion 300B, that is, the clad material 30 is formed by two bonding layers (side surfaces 31d and 32d) of the first metal layer 31 and the two second metal layers 32 in the Y direction. In particular, the joint strength of the joint end portion 30a exposed on the surface of one side (Z2 side) of the clad material 30 is improved, compared to the clad material formed by the conventional manufacturing method. Therefore, the peeling resistance is sufficiently improved. Further, similarly to the case of the clad material 10, the clad material 30 formed with a rolling reduction of a predetermined value or more can have preferable resistance to bending peeling.

In addition, as in the case of the clad material 10, as in the clad materials disclosed in Patent Documents 1 and 2, means for forming uneven joint surfaces (side end surfaces) of the first metal plate and the second metal plate, or 7, which is composed of a first metal layer 31 and two second metal layers 32, without using means for forming and arranging a plurality of metal squares having square cross sections. can be done.

In order to verify the effect of the clad material manufacturing method according to the present invention, an inlay-type (first embodiment) clad rolled material and clad material, which is a representative configuration example, were formed. Specifically, according to the clad material manufacturing method shown in FIG. 1, in the metal plate preparation step, the first metal plate 101, the second metal plate 102 and the third metal plate 103 shown in FIG. 2 were prepared. In the step of forming the clad rolled material, the clad rolled material 100 composed of the first metal layer 101, the second metal layer 102 and the third metal layer 103 shown in FIG. 2 was formed. In the step of forming the clad rolled material, a mineral oil-based rolling oil used for conventional cold rolling was used, and roll bonding was performed with rolling rolls.

Here, before the step of removing the metal plate, a diffusion annealing step of heat-treating the clad rolled material 100 under predetermined holding conditions (400°C, 3 minutes) was added. If the diffusion annealing is performed under appropriate conditions in consideration of the diffusion characteristics of the constituent elements of the first metal plate and the second metal plate, an intermetallic compound layer having a moderate thickness can be formed at the bonding interface between the first metal layer and the second metal layer. is formed, and the bonding strength between the first metal layer and the second metal layer of the clad material can be improved.

After the diffusion annealing step, in the step of removing the metal plate, the clad material 10 was formed by removing the dummy portion 100B (the third metal layer 103) from the clad rolled material 100 to leave the product corresponding portion 100A. An inlay-type clad material 10 shown in FIG. 3 was formed through the above-described steps.

Table 1 shows the material, hardness, thickness and width of the three metal plates prepared in the metal plate preparation process. The thick part of the first metal plate means the part where the third metal plate directly overlaps. The thin portion of the first metal plate means the portion where the second metal plate that becomes the inlay core overlaps. One type of first metal plate, one type of second metal plate, and nine types of third metal plate were prepared.

The material symbols shown in Table 1 comply with JIS standards. The dimensions (plate thickness, plate width) shown in Table 1 are obtained based on the measured values obtained by randomly selecting the dimensional measurement position of each metal plate and measuring multiple times with a general vernier caliper or micrometer. is the average value. The hardness shown in Table 1 is obtained by randomly selecting a cut cross-section in the rolling width direction (Y direction) of each metal plate and measuring it multiple times with a low-load Vickers hardness tester manufactured by Akashi Seisakusho Co., Ltd. The measured values. is an average value obtained based on

The maximum difference in hardness of the third metal plate shown in Table 1 is the difference in hardness between the third metal plate and the first metal plate and the difference in hardness between the third metal plate and the second metal plate. and , whichever has the greater difference. No. shown in Table 1. Each of the third metal plates 1 to 8 is a material (third metal) that has a difference in hardness (maximum difference in hardness shown in Table 1) between the first metal plate and the second metal plate of 100 HV or less. is selected, and further tempered to the hardness shown in Table 1. In addition, No. shown in Table 1. For the third metal plate No. 9, a material (SPCC) whose hardness difference is unlikely to be 100 HV or less is selected and tempered to the hardness shown in Table 1. In addition, No. shown in Table 1. In 5 to 8, the third metal plate is made of the same material (third metal) as the material of the first metal plate (first metal) whose hardness is lower than that of the second metal plate (second metal).

Table 2 shows the rolling reduction (%) when three metal plates are roll-joined in the clad rolled material formation process, and the layer thicknesses of the three metal layers constituting the clad rolled material 100 formed by the roll-joining. (mm). The thick portion of the first metal layer means the portion directly overlapping with the third metal layer. The thin portion of the first metal layer means the portion where the second metal layer, which is the inlay layer, overlaps.

The rolling reduction (%) shown in Table 2 is the ratio of the thickness changed by roll bonding, and the total thickness (mm) of the three metal plates shown in Table 1 before roll bonding is Tb, and rolling It is a value obtained by (Tb−Ta)/Tb×100(%), where Ta is the total layer thickness (mm) of the three metal plates shown in Table 2 after bonding. The plate thickness of the first metal plate is the thin portion plate thickness, and the layer thickness of the first metal layer is the thin portion layer thickness. The layer thicknesses (mm) of the first metal layer, the second metal layer and the third metal layer shown in Table 2 are measured in the rolling direction (X direction) and the rolling width direction (Y direction) of the clad rolled material. It is an average value obtained based on the measured values obtained by randomly selecting positions and measuring multiple times with a metallurgical microscope PMG3 (magnification: 200 times) manufactured by Olympus Corporation.

As an example of an inlay-type clad rolled material, No. Regarding 6A, FIG. 8 shows a cross-sectional view (map). This cross-sectional view (map) is an enlarged view of a portion including a joint end portion of an inlay-type clad rolled material having a three-layer structure of Al layer-Cu layer-Al layer. This cross section is in the rolling width direction (Y direction) perpendicular to the thickness direction (Z direction) of the clad rolled material, and is the joint end between the Al layer (first metal layer) and the Cu layer (second metal layer). including part. The Cu layer is an inlay layer of the rolled clad material. In this cross section, it can be confirmed that the Z1 side of the Cu layer is covered with the Al layer, which is the first metal layer. Also, it can be confirmed that the Z2 side of the Cu layer is covered with the Al layer, which is the third metal layer. Also, it can be confirmed that the joint end between the Al layer and the Cu layer, which are the first metal layers, is not exposed in the Z direction. Moreover, peeling (or unbonding) is not observed in any of the bonding interfaces between the Al layer, the Cu layer, which is the first metal layer, and the Al layer, which is the third metal layer. As a result, in the inlay-type clad rolled material of the example of the present invention, the first metal layer (Al layer), the second metal layer (Cu layer), and the third metal layer (Al layer) are separated (or not joined). ), sufficient peel resistance can be obtained.

Also, as another example of the inlay-type clad rolled material, No. 4, a cross-sectional view (map) is shown in FIG. This cross-sectional view (map) is an enlarged view of a portion including a joint end portion of an inlay-type clad rolled material having a three-layer structure of Al layer-Cu layer-Cu layer. This cross section is in the rolling width direction (Y direction) perpendicular to the thickness direction (Z direction) of the clad rolled material, and is the joint end between the Al layer (first metal layer) and the Cu layer (second metal layer). including part. The Cu layer, which is the second metal layer, is an inlay layer of the rolled clad material. In this cross section, it can be confirmed that the Z1 side of the Cu layer, which is the second metal layer, is covered with the Al layer. Moreover, it can be confirmed that the Z2 side of the Cu layer, which is the second metal layer, is covered with the Cu layer, which is the third metal layer. Also, it can be confirmed that the joint end between the Al layer and the Cu layer, which is the second metal layer, is not exposed in the Z direction. Moreover, peeling (or unbonding) is not observed in any of the bonding interfaces between the Al layer, the Cu layer as the second metal layer, and the Cu layer as the third metal layer. As a result, the inlay type clad rolled material of the example of the present invention is separated (or not joined) between the first metal layer (Al layer), the second metal layer (Cu layer) and the third metal layer (Cu layer). ), sufficient peel resistance can be obtained.

Also, as an example of an inlay-type clad material, No. FIG. 10 shows a cross-sectional view (map) of the clad material formed by using the rolled clad material of 6B. This cross-sectional view (map) is an enlarged view of a portion including a joint end portion of an inlay-type clad material having a two-layer structure of Al layer-Cu layer (inlay layer). This cross section is in the rolling width direction (Y direction) perpendicular to the thickness direction (Z direction) of the clad material, and is the joint end portion between the Al layer (first metal layer) and the Cu layer (second metal layer) including. The Cu layer is an inlay layer of the clad material. In this cross section, the part that is whiter than the Al layer and the Cu layer and extends from the Z1 side of the Y1 side toward the joint end is the joint interface. In this cross section, it can be confirmed that an intermetallic compound layer is formed between the Al layer and the Cu layer. Further, no peeling (or unbonded) is observed at the bonding interface between the Al layer and the Cu layer, and no peeling (or unbonded) is confirmed near the bonding edge. As a result, the inlay-type clad material of the example of the present invention does not have peeling (or non-bonding) between the first metal layer (Al layer) and the second metal layer (Cu layer), so it has sufficient peeling resistance. can have

Next, for the purpose of comparison with the case of using the above-described third metal plate, an inlay-type clad material was formed without using the third metal plate and using a Cu plate (second metal plate) as an inlay core. bottom. Specifically, in the step of preparing the metal plates, an Al plate (first metal plate) made of A1050 and a Cu plate (second metal plate) made of C1020 were prepared. Then, the Al plate and the Cu plate serving as the inlay core were stacked in the thickness direction, and rolled and joined by rolling rolls to form inlay-type clad materials (Comparative Examples 1 and 2). Further, this clad material was subjected to heat treatment (diffusion annealing) under predetermined holding conditions (400° C., 3 minutes) in the same manner as in the present invention example.

In Comparative Example 1, the third metal plate was not used, and the same mineral oil-based rolling oil as in the example of the present invention was used in a lubricated state, that is, in a state in which the rolling oil could penetrate into the joint interface of the clad material. , and roll-joining is performed by rolling rolls. In Comparative Example 1, peeling was sometimes visually observed on the surface of the bonding interface (near the bonding end portion) between the Al layer (first metal layer) and the Cu layer (second metal layer) after roll bonding. FIG. 11 shows a cross-sectional view (map) as an example of peeling (or non-bonding) at the bonding edge of the Al layer and the Cu layer in Comparative Example 1 in a lubricated state using rolling oil. Such delamination (or non-bonding) occurring in the vicinity of the joint end is considered to be caused by penetration of rolling oil into the joint surface. From this, the clad material of Comparative Example 1, in which the rolling oil may have entered the joint surface because the third metal plate was not used, peeled off (or unjoined) at the joint end of the Al plate and the Cu plate. ) may occur, so it was found that the peeling resistance may not be sufficient. In the case of Comparative Example 1, peeling (or unbonding) occurred, so a bending test, which will be described later, was not performed.

In Comparative Example 2, the third metal plate was not used, and rolling oil was not used, and in a non-lubricated state, that is, in a state in which the rolling oil did not enter the joint interface of the clad material, rolling and joining was performed with a rolling roll. I have been there. In Comparative Example 2, peeling was not visually recognized on the surface of the bonding interface (near the bonding end portion) between the Al layer (first metal layer) and the Cu layer (second metal layer) after roll bonding. FIG. 12 shows a cross-sectional view (map) as an example of the vicinity of the joint end portion between the Al layer and the Cu layer in relation to Comparative Example 2 in a non-lubricated state using no rolling oil. From this, the inlay-type clad material of Comparative Example 2, which does not use the third metal plate but does not use rolling oil and does not allow rolling oil to enter the joint surface, has an Al layer (first metal layer) and the Cu layer (second metal layer). Therefore, the inlay-type clad material of Comparative Example 2 may have sufficient peeling resistance. However, the production method in which the roll bonding is performed by rolling rolls without using rolling oil and without lubrication is not preferable from a practical point of view. In this case, due to the direct contact between the surface of the rolling roll and the surface of the material to be rolled (metal plate), the mutual surface damage such as surface roughening, indentation flaws and adhesion of foreign matter is enormous. For the clad material of Comparative Example 2, no peeling (or unbonded) was observed near the joint edge, so a bending test using a clad test piece, which will be described later, was performed.

Next, a plurality of clad specimens were cut out from each of the clad rolled material and the clad material formed through each of the above processes, and the joint cross-section and joint strength were evaluated. Specifically, a plurality of clad specimens were cut out from the rolled clad material so as to include the joint ends. Then, the cross sections along the rolling width direction (Y direction), particularly the joint surfaces (see the side surfaces 101d and 102c shown in FIG. 2) and the joint ends of the plurality of clad test pieces were observed in an enlarged manner. Similarly, a plurality of clad specimens were cut out from the clad material so as to include the joint ends. Then, the cross sections along the rolling width direction (Y direction), particularly the joint surfaces (see the side surfaces 11d and 12c shown in FIG. 3) and the joint end portions of the plurality of clad specimens were enlarged and observed. Next, except for Comparative Example 1, a bending test was performed in which a plurality of clad specimens cut out from the clad material so as to include the joint ends were bent in a convex shape. After the bending test, the presence or absence of peeling (or unbonding) was confirmed for the bonding interface including the bonding edge of the clad test piece. In this bending test, the clad specimen was bent so that the vicinity of the joint end was positioned substantially at the top of the convex bend in order to apply a larger load to the joint end.

Regarding the clad materials other than the above-described Comparative Example 2, FIG. 13 shows a cross-sectional view (image) of the appearance of the clad test body as an example of the clad test body after the bending test. The clad specimen after the bending test shown in FIG. 13 is bent so that the vicinity of the joint end of the clad material (clad specimen) is positioned almost at the top of the convex bend, and the bend angle is about 100 degrees. It's becoming In the cross section shown in FIG. 13, no obvious separation (or unbonded) is observed at the bonding interface between the Al layer (first metal layer) and the Cu layer (second metal layer) which is an inlay layer. Further, FIG. 14 shows an enlarged cross-sectional view (map) of a portion including the Y2-side joint end of the clad specimen after the bending test shown in FIG. In the cross section shown in FIG. 14, peeling (or non-bonding) is not observed at the joint end between the Al layer (first metal layer) and the Cu layer (second metal layer) which is an inlay layer. As a result, even after the bending test as described above, the inlay-type clad material of the example of the present invention is peeled (or separated) between the first metal layer (Al layer) and the second metal layer (Cu layer). Since there is no unbonded joint, it is possible to have sufficient resistance to bending peeling.

In addition, regarding the clad material of Comparative Example 2 described above, FIG. 15 shows an enlarged cross-sectional view (map) of a portion including the joint end portion as an example of a clad test piece after the bending test. In the cross section shown in FIG. 15, severe peeling (or non-bonding) is confirmed at the bonding edge between the Al layer (first metal layer) and the Cu layer (second metal layer) which is an inlay layer. From this, the inlay-type clad material of Comparative Example 2, which does not use the third metal plate and the rolling oil, causes severe peeling (or unbonding) at the bonding end when the above bending test is performed. It was found that it does not have sufficient bending peeling resistance because it may be broken.

Table 3 shows some of the results of the bending test described above. Table 3 summarizes the rolling reduction (%) of the roll joint in the forming process of the clad rolled material, whether or not rolling oil is used, and whether or not the third metal plate is used, and is divided into bending test groups. . A bend test group means a bend test performed using a plurality of clad specimens cut out from a clad material formed under the same conditions. The pass probability means a value obtained by dividing the number of clad specimens in which no peeling was confirmed at the joint edge in the bending test group by the number of clad specimens subjected to the bending test. The bending peeling resistance was defined as "high" when Ps=1, "medium" when 0<Ps<1, and "low" when Ps=0, where Ps was the acceptance probability.

In Table 3, Group G1 is an inlay-type clad material formed by rolling and joining with rolling rolls at a rolling reduction of 58% using a third metal plate with a thickness of 0.10 mm and rolling oil. . As a result of the above-described bending test, Group G1 had a passing probability of 0.34, and was evaluated as "medium" in bending peeling resistance.

In addition, group G2 uses a third metal plate with a thickness of 0.10 mm and rolling oil, and has a rolling reduction of 67%, which is larger than that of group G1. It is wood. As a result of the above-described bending test, group G2 had a passing probability of 1, and was evaluated as "high" in resistance to bending peeling.

In addition, group G3 uses a third metal plate with a thickness of 0.05 mm and rolling oil, and is formed by rolling and joining with a rolling roll at a reduction rate of 68%, which is larger than group G1 and substantially the same as group G2. It is an inlay-type clad material. As a result of the above-described bending test, group G3 had a passing probability of 1, and therefore was evaluated as "high" in resistance to bending peeling.

Group G4 corresponds to Comparative Example 2 in which the third metal plate and rolling oil are not used, and is an inlay-type clad material formed by rolling and joining with rolling rolls at a rolling reduction of 59%, which is substantially the same as Group G1. is. As a result of the above-described bending test, group G4 had a passing probability of 0, and was evaluated as "low" in terms of resistance to bending peeling.

Group G5 corresponds to Comparative Example 2 in which the third metal plate and rolling oil are not used, and is rolled with a rolling roll at a reduction rate of 68%, which is approximately the same as group G2 and group G3, which is approximately 10% larger than group G4. It is an inlay-type clad material formed by bonding. Group G5 had a rolling reduction about 10% larger than Group G4, but as a result of the bending test described above, the pass probability was 0, so the resistance to bending peeling was evaluated as "low".

In Table 3, Group G1 is a case where rolling oil is used to make the bonding strength disadvantageous, and the third metal plate is rolled and bonded at a rolling reduction of 58%. Group G4, on the other hand, is a case where rolling oil is not used and conditions are favorable for improving the bonding strength, and roll bonding is performed at a rolling reduction of 59% without using the third metal plate. As a result, the group G1 using the third metal plate was evaluated as "medium" in bending peeling resistance, whereas the group G4 using the third metal plate at substantially the same rolling reduction (about 60%) did not use the third metal plate. In , the bending peeling resistance was evaluated as "low". From this, when forming an inlay-type clad material, it was found that using the above-described third metal plate is effective in improving the resistance to bending peeling.

In addition, regarding the examples of the present invention, the reduction ratio is different between the group G1 and the group G2 using the third metal plate having the same thickness. The rolling reduction of group G1 is 58%, and the rolling reduction of group G2 is 67%. The difference in rolling reduction between the two is about 10%. Group G1, which has a small rolling reduction, was evaluated as having "medium" bending peeling resistance, while Group G4, which has a large rolling reduction, had a "medium" bending peeling resistance. It was rated as "High". From this, it was found that when forming an inlay-type clad material using the third metal plate, increasing the reduction ratio of rolling bonding by rolling rolls is effective for improving the resistance to bending peeling.

Here, if there is a linear correlation between the rolling reduction and the bending test pass probability (bend peeling resistance), the passing probability at a rolling reduction of 58% is 0.34 (that is, about 1 /3), the acceptance probability at a rolling reduction of 67% is 1 (i.e., 3/3), and the difference in rolling reduction is 9%, so the acceptance probability is 0.66 (i.e., 2/3). 3) is considered to be around 65% from 58%+9%×(2/3)=64%. Therefore, when it is desired to form an inlay-type clad material having peeling resistance using the third metal plate and preferably obtain bending peeling resistance, the above-mentioned rolling reduction rate is evaluated as "medium" but bending peeling resistance It is 60% or more where the resistance is obtained, preferably 65% or more, which is considered to further improve the bending peeling resistance, and more preferably 67% or more, where the bending peeling resistance is evaluated as "high". recommended.

As a result of the above-mentioned bending test, the inlay-type clad materials of groups G1 to G3 with a "high" or "medium" evaluation of bending peeling resistance are more durable and reliable against severe vibrations and impacts, as described above. It is thought that it can be used for wiring parts and heat dissipation parts that require good performance. In addition, the inlay-type clad materials of Groups G2 and G3, which have a "high" evaluation of bending peeling resistance, are subjected to bending in order to cope with the complication and diversification of the shapes of facilities and equipment, as described above. It is considered that it can be used sufficiently for wiring parts and heat dissipation parts.

As described above, according to the clad material manufacturing method according to the present invention, it is possible to suppress the infiltration of rolling oil into the joint surface and improve the peeling resistance. It was confirmed that it is possible to have bending peeling resistance in which peeling is less likely to occur.

Claims

preparing a first metal plate made of a first metal, a second metal plate made of a second metal different from the first metal, and a third metal plate made of a third metal;
Rolling the second metal plate while sandwiching the second metal plate between the first metal plate and the third metal plate so as not to expose the rolled surface of the second metal plate, and rolling the first metal layer made of the first metal and a step of forming a clad rolled material comprising a second metal layer made of the second metal and a third metal layer made of the third metal;
and removing the third metal layer from the clad rolled material,
A clad material forming a clad material in which the second metal layer exists on one rolled surface side in the thickness direction and the second metal layer does not exist on the other rolled surface side in the thickness direction. manufacturing method.
Prepare the first metal plate and the third metal plate having a length in the rolling width direction greater than that of the second metal plate,
The second metal layer having a smaller length in the rolling width direction than the first metal layer is present on one side of the rolled surface in the thickness direction, and the second metal layer is on the other side of the rolled surface in the thickness direction. 2. The method of manufacturing a clad material according to claim 1, wherein the clad material is formed in the absence of
The method for producing a clad material according to claim 1 or 2, wherein in the step of forming the clad rolled material, the material is rolled at a rolling reduction of 65% or more.
3. The third metal according to claim 1, wherein a metal having a hardness difference of 100 HV or less between said first metal plate and said second metal plate in contact with said third metal plate is selected as said third metal. A method of manufacturing a clad material.
The method for producing a clad material according to claim 1 or 2, wherein the third metal is any one of Al, Al alloy, Cu, Cu alloy, Fe, and Fe alloy.
The method for producing a clad material according to claim 1 or 2, wherein one of the first metal and the second metal is Al or an Al alloy, and the other is Cu or a Cu alloy.
3. The method of manufacturing a clad material according to claim 1, wherein one of said first metal and said second metal is Cu or a Cu alloy, and the other is Fe, an Fe alloy, or stainless steel.