Solid-phase bonding device and solid-phase bonding method

Abstract

To provide an art capable of forming projections of a constant height in solid-phase bonding.SOLUTION: A solid-phase bonding device includes: a pair of pressurizing shafts which press a first workpiece and a second workpiece which have conductivity and overlap with each other in a thickness direction from both sides in the thickness direction; a pair of electrodes respectively disposed at peripheries of the pair of pressurizing shafts; and a control device. The control device controls a push-in depth of the pair of pressurizing shafts in accordance with characteristics of materials of the first workpiece and the second workpiece (STEP S1 to S3).SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a solid-phase bonding device and a solid-phase bonding method.

Background Art

[0002] Japanese Patent No. 7242112 (Patent Document 1) discloses a solid-phase point bonding device including a pressurizing mechanism including a pressing portion and an energizing mechanism including a pair of welding electrodes. In the solid-phase point bonding device disclosed in Patent Document 1, after pressing a protrusion provided on the bottom surface of the pressing portion against a metal plate material, the bottom surface is pressed to press-fit the pressing portion into the metal plate material. Thereafter, in such a solid-phase point bonding device, a current is passed from the electrode to the metal plate material and the pressing portion further presses the metal plate material, whereby the metal plate materials are joined.

[0003] In Patent Document 1, when press-fitting the pressing portion into the metal plate material, there is no clear disclosure regarding the amount of penetration and the pressing force with which the pressing portion is press-fitted into the metal plate material. Generally, in a solid-phase bonding device such as a solid-phase point bonding device, when pressing a workpiece that is a metal plate material, the pressurizing shaft has been pressed into the workpiece with a certain amount of penetration regardless of the type of material.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the pressurizing shaft is pressed into the workpiece with a certain amount of penetration as in the prior art, there are the following problems.

[0006] In a solid-phase bonding device, a pair of pressure shafts are used to form protrusions of a certain height on a first workpiece and a second workpiece that are conductive and overlap in the thickness direction by pushing the pressure shafts into the first workpiece and the second workpiece from both sides in the thickness direction. Then, in the solid-phase bonding device, an electric current is passed from an electrode through the contact surface where the protrusion formed on the first workpiece and the protrusion formed on the second workpiece come into contact, thereby softening the first workpiece and the second workpiece.

[0007] In the solid-phase bonding device, when forming protrusions on the workpiece, for example, when pushing the pressure shaft with a certain pushing amount against workpieces with different material properties such as different hardnesses, even if the pressure shaft is pushed with the same pushing amount, there will be cases where protrusions of a certain height can be formed and cases where protrusions of a certain height cannot be formed.

[0008] Thus, when protrusions of a certain height cannot be formed on the workpiece, compared with the case where protrusions of a certain height are formed on the workpiece, the ease of current flow to the workpiece becomes different. Therefore, when an electric current is passed through the workpiece after the formation of the protrusions, there is a risk that the strength of the workpiece after bonding becomes insufficient due to reasons such as excessive or insufficient energization.

[0009] An object of the present disclosure is to provide a technique capable of forming protrusions of a certain height in solid-phase bonding.

Means for Solving the Problem

[0010] The solid-phase bonding device of the present disclosure includes a pair of pressure shafts that press a first workpiece and a second workpiece that are conductive and overlap in the thickness direction from both sides in the thickness direction, a pair of electrodes respectively arranged around the pair of pressure shafts, and a control device. The control device controls the pushing amount of the pair of pressure shafts according to the material properties of the first workpiece and the second workpiece.

[0011] The solid-phase bonding method of the present disclosure is a solid-phase bonding method using a solid-phase bonding apparatus including a pair of pressing shafts that press a first workpiece and a second workpiece that are conductive and overlap in the thickness direction from both sides in the thickness direction, and a pair of electrodes respectively disposed around the pair of pressing shafts, and includes a step of acquiring the characteristics of the materials of the first workpiece and the second workpiece, and a step of controlling the pushing amount of the pair of pressing shafts according to the characteristics of the materials of the first workpiece and the second workpiece.

Effect of the Invention

[0012] According to the present disclosure, since the pushing amount of the pair of pressing shafts is controlled according to the characteristics of the materials of the first workpiece and the second workpiece, protrusions having a certain height can be formed in solid-phase bonding.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions will not be repeated.

[0015] [Explanation Regarding Schematic Configuration of Solid-Phase Bonding Apparatus 1] FIG. 1 is a diagram schematically showing a solid-phase bonding apparatus 1 according to an embodiment. The solid-phase bonding apparatus 1 forms a softened region at the interface of a plurality of workpieces W10 and W20 that are overlapped with each other by energizing them, and plastically deforms the softened region to bond the plurality of workpieces W10 and W20 to each other in a solid state without melting them.

[0016] The plurality of workpieces W10 and W20 include a first workpiece W10 and a second workpiece W20. Each workpiece W10 and W20 is made of a metal such as iron or aluminum. Each workpiece W10 and W20 is formed, for example, in a flat plate shape. Note that each workpiece W10 and W20 may be made of something other than metal, as long as it has conductivity and is a material suitable for solid-phase bonding.

[0017] As shown in FIG. 1, the solid-phase bonding apparatus 1 includes a solid-phase bonding device 10, a control device 30, a power supply device 35, a drive device 13, and an input device 5. The solid-phase bonding device 10 includes a pair of pressing shafts 11 and 12, a pair of electrodes 21 and 22, a first pressure sensor 41, and a second pressure sensor 42.

[0018] The pair of pressing shafts 11 and 12 includes a first pressing shaft 11 and a second pressing shaft 12. The pair of pressing shafts 11 and 12 can press the first workpiece W10 and the second workpiece W20 from both sides in the thickness direction in which the plate-shaped workpieces are overlapped. The first pressing shaft 11 is driven by the first drive device 13. The second pressing shaft 12 is driven by the second drive device 14.

[0019] The first pressing shaft 11 can press the first workpiece W10 so that the first workpiece W10 is plastically deformed. Specifically, the first pressing shaft 11 can press the first workpiece W10 so that a protrusion W11 is formed on the first workpiece W10. The first pressing shaft 11 is made of, for example, tungsten carbide. In the present embodiment, the first pressing shaft 11 is formed in an elongated columnar shape. The first pressing shaft 11 has a pressing surface 110 at its tip for pressing the first workpiece W10. The pressing surface 110 is the tip surface of the first pressing shaft 11. As shown in FIGS. 2(A) and (B), the pressing surface 110 has a shape in which a protrusion 112 is formed at the center of a circular bottom surface 111. The shape of the protrusion 112 is, for example, a frustum of a cone shape.

[0020] The second pressing shaft 12 has the same configuration as that of the first pressing shaft 11. The second pressing shaft 12 can press the second workpiece W20 so that the second workpiece W20 is plastically deformed. Specifically, the second pressing shaft 12 can press the second workpiece W12 so that a protrusion W21 is formed on the second workpiece W20. The second pressing shaft 12 is made of, for example, tungsten carbide. In the present embodiment, the second pressing shaft 12 is formed in an elongated columnar shape. The second pressing shaft 12 has a pressing surface 120 at its tip for pressing the second workpiece W20. The pressing surface 120 is the tip surface of the second pressing shaft 12. As shown in FIGS. 2(A) and (B), the pressing surface 120 has a shape in which a protrusion 122 is formed at the center of a circular bottom surface 121. The shape of the protrusion 122 is, for example, a frustum of a cone shape.

[0021] The second pressing shaft 12 is arranged such that the central axis of the second pressing shaft 12 is located on the extension line of the central axis of the first pressing shaft 11, and the pressing surface 120 of the second pressing shaft 12 faces the pressing surface 110 of the first pressing shaft 11. Note that the first pressing shaft 11 and the second pressing shaft 12 may have shapes other than columnar shapes.

[0022] The first pressure sensor 41 is provided, for example, on the first pressing shaft 11. The second pressure sensor 42 is provided, for example, on the second pressing shaft 12. In the present embodiment, load cells are used as the first pressure sensor 41 and the second pressure sensor 42. Note that the installation location of the first pressure sensor 41 is not limited to the first pressing shaft 11 and may be provided on the first driving device 13 or the like. Also, the installation location of the second pressure sensor 42 is not limited to the second pressing shaft 12 and may be provided on the second driving device 14 or the like.

[0023] The pair of electrodes 21, 22 includes a first electrode 21 and a second electrode 22. The pair of electrodes 21, 22 can be energized to the first workpiece W10 and the second workpiece W20 in a state of being in contact with the first workpiece W10 and the second workpiece W20. When a voltage is applied to the pair of electrodes 21, 22 in a state where the pair of electrodes 21, 22 is in contact with the first workpiece W10 and the second workpiece W20, electric power is supplied to the first electrode 21, the first workpiece W10, the second workpiece W20, and the second electrode 22.

[0024] The first electrode 21 can contact a portion around a portion of the first workpiece W10 that is pressed by the first pressing shaft 11. In the present embodiment, the first electrode 21 is formed in a cylindrical shape surrounding the first pressing shaft 11. A gap is provided between the inner peripheral surface of the first electrode 21 and the outer peripheral surface of the first pressing shaft 11. The first electrode 21 is made of, for example, copper. The first electrode 21 has a contact surface 21a that contacts the first workpiece W10. The contact surface 21a is formed in an annular shape. Note that the shape of the contact surface 21a is not limited to an annular shape.

[0025] The second electrode 22 has the same configuration as that of the first electrode 21. The second electrode 22 can contact a portion around a portion of the second workpiece W20 that is pressed by the second pressing shaft 12. The second electrode 22 is arranged such that the central axis of the second electrode 22 is located on the extension line of the central axis of the first electrode 21, and the contact surface 22a of the second electrode 22 faces the contact surface 21a of the first electrode 21.

[0026] The control device 30 includes an arithmetic unit 31, a memory 32, a storage device 33, and an input / output interface 34. These components are connected via a bus.

[0027] The arithmetic unit 31 is an arithmetic entity (computer) that executes predetermined processing. The arithmetic unit 31 is composed of a processor such as a CPU (Central Processing Unit), MPU (Micro-Processing Unit), TPU (Tensor Processing Unit), or GPU (Graphics Processing Unit), for example. Note that a processor, which is an example of the arithmetic unit 31, has a function of executing predetermined processing by executing a predetermined program, but some or all of these functions may be implemented using a dedicated hardware circuit such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array). The "processor" is not limited to a narrow-sense processor that executes processing in a stored-program manner such as a CPU, MPU, TPU, or GPU, and may include a hard-wired circuit such as an ASIC or FPGA. Also, the arithmetic unit 31 is not limited to a Neumann-type computer such as a CPU or GPU, and may be composed of a non-Neumann-type computer such as a quantum computer or an optical computer. The arithmetic unit 31 as described above can also be read as a processing circuit (Processing Circuitry) that executes predetermined processing. Note that the arithmetic unit 31 may be composed of one chip or a plurality of chips. Furthermore, the processor and related processing circuits may be composed of a plurality of computers that are interconnected by wire or wirelessly via a local area network or a wireless network, for example. The processor and related processing circuits may be composed of a cloud computer that remotely performs arithmetic operations based on input data and outputs the arithmetic results to another device located at a remote position.

[0028] The memory 32 includes a storage area (e.g., a working area) for storing program codes or a work memory when the arithmetic unit 31 executes various programs. Examples of the memory 32 include volatile memories such as DRAM and SRAM, or non-volatile memories such as ROM and flash memory.

[0029] The storage device 33 stores various programs or various data executed by the arithmetic unit 31. For example, the storage device 33 stores a control program 330 for controlling various devices executed by the arithmetic unit 31. The storage device 33 may be one or more non-transitory computer readable media, or may be one or more computer readable storage media. Examples of the storage device 33 include HDD (Hard Disk Drive) and SSD (Solid State Drive).

[0030] Data detected by sensors such as the first pressure sensor 41 and the second pressure sensor 42 is input to the input / output interface 34. An input device 5 is connected to the control device 30. The input device 5 is composed of one or more devices among devices capable of inputting data such as a keyboard, a mouse, and a touch panel. The data input from the input device 5 can be input to the arithmetic unit 31 and the memory 32 via the input / output interface 34.

[0031] The control device 30 controls the stroke of the first pressurizing shaft 11 by controlling the first driving device 13. The control device 30 controls the stroke of the second pressurizing shaft 12 by controlling the second driving device 14. The control device 30 controls the supply current to the pair of electrodes 21, 22 by controlling the power supply device 35.

[0032] Specifically, the control device 30 controls the first driving device 13 to move the first pressing shaft 11 toward the first workpiece W10, thereby controlling the load acting on the first workpiece W10 from the first pressing shaft 11, the load acting on the first workpiece W10 from the first electrode 21, and the pushing-in amounts of the first pressing shaft 11 and the first electrode 21. The control device 30 controls the second driving device 14 to move the second pressing shaft 12 toward the second workpiece W20, thereby controlling the load acting on the second workpiece W20 from the second pressing shaft 12, the load acting on the second workpiece W20 from the second electrode 22, and the pushing-in amounts of the second pressing shaft 12 and the second electrode 22.

[0033] Furthermore, the control device 30 controls the power supply device 35 to control the current X supplied to the pair of electrodes 21, 22.

[0034] The control device 30 causes the first driving device 13 and the second driving device 14 to perform an operation of applying a load F to the first workpiece W10 and the second workpiece W20 from the pair of pressing shafts 11, 12 so that protrusions W11, W21 that come into contact with each other are formed on the first workpiece W10 and the second workpiece W20, respectively.

[0035] The control device 30 causes the power supply device 35 to perform an operation of energizing the first workpiece W10 and the second workpiece W20. Specifically, by the control device 30 controlling the first driving device 13, the second driving device 14, and the power supply device 35, the following state is produced.

[0036] An operation is performed by the first driving device 13 and the second driving device 14 to apply a load F to the first workpiece W10 and the second workpiece W20 from the pair of pressing shafts 11, 12, and to bring the contact surface 21a of the first electrode 21 into contact with a portion around the portion of the first workpiece W10 that is pressed by the first pressing shaft 11, and to bring the contact surface 22a of the second electrode 22 into contact with a portion around the portion of the second workpiece W20 that is pressed by the second pressing shaft 12. In such a state, an operation of energizing the first workpiece W10 and the second workpiece W20 is performed by the power supply device 35.

[0037] The control device 30 controls the power supply device 35 so that a current X indicated by a broken line flows between the pair of electrodes 21 and 22 through the respective protrusions W11 and W21. Each of the protrusions W11 and W21 softens when the current X flows therethrough.

[0038] In the present embodiment, the control device 30 causes the current X to flow to soften the respective protrusions W11 and W21, and pushes the first pressing shaft 11 toward the first workpiece W10 and the second pressing shaft 12 toward the second workpiece W20, thereby applying a load F in a direction opposite to the first workpiece W10 and the second workpiece W20. As a result, in the present embodiment, the first workpiece W10 and the second workpiece W20 can be joined at the positions of the respective protrusions W11 and W21.

[0039] [Explanation Regarding Formation of Protrusions W11 and W21] Next, an explanation will be given of how the protrusions W11 and W21 are formed. The state of the forming process for forming the protrusions W11 and W21 is the same for the protrusion W11 and the protrusion W21. Here, taking the protrusion W21 as a representative example, the forming process of the protrusions W11 and W21 will be described with reference to FIGS. 2(A) and 2(B). The protrusions W11 and W21 are formed simultaneously, for example.

[0040] FIGS. 2(A) and 2(B) are diagrams showing the forming process of the protrusions W11 and W21. In FIGS. 2(A) and 2(B), the forming process will be described using the protrusion W21 as a representative example, and reference numerals indicating the state of forming the protrusion W11 are described in parentheses in association with the reference numerals indicating the state of forming the protrusion W21.

[0041] In Fig. 2(A), the relationship between the second workpiece W20 and the second pressing shaft 12 before the second pressing shaft 12 is pushed into the second workpiece W20 is shown. As shown in Fig. 2(A), when a load F acts on the second pressing shaft 12, first, the protruding portion 122 of the contact surface 120 contacts the second workpiece W20 and presses the second workpiece W20. Then, as shown in Fig. 2(B), when the action of the load F on the second pressing shaft 12 continues, the protruding portion 122 is pushed into the second workpiece W20. And, as shown in Fig. 2(B), the bottom surface 121 of the contact surface 120 contacts the second workpiece W20 and presses the second workpiece W20. As a result, as shown in Fig. 2(B), both the protruding portion 122 and the bottom surface 121 of the contact surface 120 are pushed into the second workpiece W20, and the protrusion W21 is formed.

[0042] In Fig. 2(B), an example is shown in which a protrusion W21 with a height L2 is formed in response to the second pressing shaft 12 being pushed in by a pushing amount L1. In the example of Fig. 2(B), the distance L1 from the initial position of the contact surface of the second workpiece W20 with the second pressing shaft 12 to the position of the tip surface of the protruding portion 122 of the second pressing shaft 12 is defined as the pushing amount L1 of the second pressing shaft 12. In the example of Fig. 2(B), the distance L2 from the initial position of the contact surface of the second workpiece W20 with the second pressing shaft 12 to the position of the tip of the protrusion W21 is defined as the height L2 of the protrusion W21. Note that the height of the protrusion W21 may be defined as the distance from the initial position, with the surface on the side opposite to the contact surface of the second workpiece W20 with the second pressing shaft 12 as the initial position, to the position of the tip of the protrusion W21.

[0043] The formation process of the protrusion W11 is the same as the formation process of the protrusion W21 described above. For the description of the specific formation process of the protrusion W11, in the description of the formation process of the protrusion W21 described above, the reference numerals of the respective parts related to the formation of the protrusion W11 associated with the reference numerals of the respective parts related to the formation of the protrusion W21 shown in Fig. 2 in parentheses are replaced.

[0044] [Explanation Regarding the Pushing Amounts during the Formation of Protrusions W11 and W21] Next, the pushing amount of the first pressing shaft 11 in the pushing operation of the first pressing shaft 11 performed by the first driving device 13 when forming the protrusion W11 and the pushing amount of the second pressing shaft 12 in the pushing operation of the second pressing shaft 12 performed by the second driving device 14 when forming the protrusion W21 will be described.

[0045] The pushing amount L1 of the first pressing shaft 11 when forming the protrusion W11 and the pushing amount L1 of the second pressing shaft 12 when forming the protrusion W21 are determined by the control device 30.

[0046] FIGS. 3(A), (B), and (C) are diagrams showing the material characteristics of the workpieces (workpieces W10, W20) used to determine the pushing amount L1 of the first pressing shaft 11 when forming the protrusion W11 and the pushing amount L1 of the second pressing shaft 12 when forming the protrusion W21.

[0047] In FIG. 3(A), the relationship between the hardness of the workpiece material required to make the heights L2 of the protrusions W11 and W21 a reference value of a certain height and the pushing amount L1 is shown as the first characteristic. Such a reference value of the heights L2 of the protrusions W11 and W21 is, for example, a height such that the strength of the workpiece after bonding can be sufficiently ensured without excessive or insufficient current after forming the protrusions W11 and W21.

[0048] For example, when the pushing amount L1 of the first pressing shaft 11 is constant, as the hardness of the material of the workpiece W10 increases, the deformation amount of the workpiece W10 decreases, and the height L2 of the protrusion W11 tends to decrease. Such a tendency is the same for the workpiece W20.

[0049] As shown in the first characteristic of FIG. 3(A), if the pushing-in amount L1 is increased as the hardness of the work material increases, the height L2 of the protrusions W11, W21 can be set to a reference value of a constant height. The reason is that as the hardness of the material increases, the work becomes less likely to deform. Therefore, in the process of forming the protrusions W11, W21, the control device 30 determines the pushing-in amount L1 corresponding to the hardness of the material of each work in the first work W10 and the second work W20 based on the first characteristic in order to set the height L2 of the protrusions W11, W21 to a reference value of a constant height.

[0050] In FIG. 3(B), the relationship between the plate thickness of the work material required to set the height L2 of the protrusions W11, W21 to a reference value of a constant height and the pushing-in amount L1 is shown as the second characteristic. For example, when the pushing-in amount L1 of the first pressing shaft 11 is constant, as the plate thickness of the material of the work W10 increases, the amount of deformation of the work W10 decreases, and the height L2 of the protrusion W11 tends to decrease. Such a tendency is the same for the work W20.

[0051] As shown in the second characteristic of FIG. 3(B), if the pushing-in amount L1 is increased as the plate thickness of the work material increases, the height L2 of the protrusions W11, W21 can be set to a reference value of a constant height. The reason is that as the plate thickness of the material increases, the work becomes less likely to deform. Therefore, in the process of forming the protrusions W11, W21, the control device 30 determines the pushing-in amount L1 corresponding to the plate thickness of the material of each work in the first work W10 and the second work W20 based on the second characteristic in order to set the height L2 of the protrusions W11, W21 to a reference value of a constant height.

[0052] In FIG. 3(C), the relationship between the tensile strength of the work material required to set the height L2 of the protrusions W11, W21 to a reference value of a constant height and the pushing-in amount L1 is shown as the third characteristic. For example, when the pushing-in amount L1 of the first pressing shaft 11 is constant, as the tensile strength of the material of the work W10 increases, the amount of deformation of the work W10 decreases, and the height L2 of the protrusion W11 tends to decrease.

[0053] As shown in the third characteristic of FIG. 3(C), if the pushing-in amount L1 is increased as the tensile strength of the workpiece material increases, the height L2 of the protrusions W11, W21 can be set to a reference value of a constant height. The reason is that as the tensile strength increases, the workpiece becomes more difficult to deform. Therefore, in the process of forming the protrusions W11, W21, the control device 30 determines the pushing-in amount L1 corresponding to the tensile strength of the material of each workpiece in the first workpiece W10 and the second workpiece W20 based on the third characteristic in order to set the height L2 of the protrusions W11, W21 to a reference value of a constant height.

[0054] In the process of forming the protrusions W11, W21, the control device 30 determines the optimal pushing-in amount L1 from the data of the hardness, the plate thickness, and the tensile strength of the material of each workpiece in the first workpiece W10 and the second workpiece W20 based on the first characteristic, the second characteristic, and the third characteristic described above in order to make the height L2 of the protrusions W11, W21 a constant height.

[0055] The control device 30 performs the following control based on the first characteristic (FIG. 3(A)), the second characteristic (FIG. 3(B)), and the third characteristic (FIG. 3(C)), which are the material characteristics of the first workpiece W10 and the second workpiece W20. For example, control is performed to increase the pushing-in amount L1 as the amount of deformation of the material with respect to the pushing-in amount L1 of the pair of pressing shafts 11, 12 decreases.

[0056] Specifically, as the hardness of the material increases, the amount of deformation of the material with respect to the pushing-in amount L1 decreases. As the plate thickness of the material increases, the amount of deformation of the material with respect to the pushing-in amount L1 decreases. As the tensile strength of the material increases, the amount of deformation of the material with respect to the pushing-in amount L1 decreases. Therefore, the control device 30 determines the optimal pushing-in amount L1 so as to increase the pushing-in amount L1 as the amount of deformation of the material with respect to a constant pushing-in amount L1 of the pair of pressing shafts 11, 12 decreases. Thereby, the height of the protrusions formed by the pushing-in amounts of the pair of pressing shafts 11, 12 can be made a constant height even if the material characteristics are different.

[0057] Regarding the process in which the control device 30 acquires the first characteristic, the second characteristic, and the third characteristic, determines the optimal pushing amount L1, and operates the first pressing shaft 11 and the second pressing shaft 12 with the determined pushing amount L1 in the process of forming the protrusions W11 and W21, it will be specifically described with reference to the flowchart of FIG. 4.

[0058] [Explanation of the control executed by the control device 30] Next, the control executed by the control device 30 in the process of forming the protrusions W11 and W21 will be described. FIG. 4 is a flowchart showing the control content executed by the control device 30 in the process of forming the protrusions W11 and W21. The processing of the flowchart shown in FIG. 4 is a part of the control program read and executed by the arithmetic unit 31 from the memory 32, and shows a program for forming the protrusion W11 on the first workpiece W10 and the protrusion W21 on the second workpiece W20.

[0059] In the control device 30, in the process of forming the protrusions W11 and W21, a database for determining the pushing amount L1 is stored in the memory 32 for each type of material. The database for determining the pushing amount L1 is a database that determines the optimal pushing amount L1 from the data of the hardness of the material of each workpiece, the data of the plate thickness, and the data of the tensile strength in the first workpiece W10 and the second workpiece W20 in consideration of all of the above-mentioned first characteristic, second characteristic, and third characteristic in order to make the height L2 of the protrusions W11 and W21 a reference value of a certain height.

[0060] Basically, the hardness and tensile strength of the material are generally fixed and do not change for each type of workpiece material. Therefore, as an example of a database for determining the penetration amount L1, data on the hardness of the workpiece material and data on the tensile strength of the workpiece material are stored in advance. When data on the type of workpiece material and data on the plate thickness of the workpiece material are input from the input device 5, the input data on the plate thickness of the material, the data on the hardness of the material stored in advance corresponding to the input type of material, and the data on the tensile strength of the material stored in advance corresponding to the input type of material are used to determine the penetration amount L1 that makes the height L2 of the protrusions W11, W21 a constant height.

[0061] In the solid-phase bonding device 1, when performing solid-phase bonding, data on the type of workpiece material and data on the plate thickness of the workpiece material are input by the operator from the input device 5. These data are stored in the memory 32.

[0062] In the control device 30, when data on the type of material and data on the plate thickness of the material are input from the input device 5, the arithmetic unit 31 reads, in step S1, the data on the type of workpiece material and the data on the plate thickness of the workpiece material from the memory 32, and selects a database corresponding to the input data on the type of material from among a plurality of databases stored in the memory 32 for each type of material.

[0063] In the arithmetic unit 31, when the data on the plate thickness input in step S1 is read and the database corresponding to the input data on the type of material is selected, the data on the hardness of the material, the data on the plate thickness, and the data on the tensile strength for determining the penetration amount L1 that makes the height L2 of the protrusions W11, W21 a constant height are obtained.

[0064] Next, in the arithmetic unit 31, according to the data of the type of the input material, using the database selected in step S2, based on the data of the input plate thickness, the data of the hardness of the material stored in advance, and the data of the tensile strength of the material stored in advance, the pressing amount L1 for making the heights L2 of the protrusions W11 and W21 a constant height is determined.

[0065] In the process of forming the protrusions W11 and W21, when the pressing amount L1 is determined as described above, in the arithmetic unit 31, in step S3, a process for transmitting a control signal from the control device 30 to the first driving device 13 and the second driving device 14 so as to press the first pressing shaft 11 and the second pressing shaft 12 by the pressing amount L1 determined in step S2 is executed.

[0066] When the first driving device 13 receives a control signal from the control device 30, the first pressing shaft 11 is operated to press the first workpiece W10 by the determined pressing amount L1 according to the received control signal. When the second driving device 14 receives a control signal from the control device 30, the second pressing shaft 12 is operated to press the second workpiece W20 by the determined pressing amount L1 according to the received control signal.

[0067] As described with reference to FIG. 4, the control for determining the pressing amount L1 of the first workpiece W10 and the second workpiece W20 and pressing the first workpiece W10 and the second workpiece W20 by the determined pressing amount L1 is executed when the first workpiece W10 and the second workpiece W20 are made of the same material and the data of the hardness of the material, the data of the plate thickness, and the data of the tensile strength are the same. Note that the control for determining the pressing amount L1 of the first workpiece W10 and the second workpiece W20 and pressing the first workpiece W10 and the second workpiece W20 by the determined pressing amount L1 may be executed individually for the first workpiece W10 and the second workpiece W20 when the first workpiece W10 and the second workpiece W10 are made of different materials, or when they are made of the same material but any of the data of the hardness of the material, the data of the plate thickness, and the data of the tensile strength is different.

[0068] [Description of Modification Example] (1) In the solid-phase bonding device 1 shown in the foregoing embodiment, a temperature adjustment device for adjusting the temperatures of the materials of the first workpiece W10 and the second workpiece W20 may be further provided. The temperature adjustment device is configured such that the temperature of the object to be adjusted is controlled by the control device 30. The control device 30 may control the temperature adjustment device as follows. In the process of forming the protrusions W11 and W21, the control device 30 controls the temperature adjustment device so that the temperature distribution of the material changes, thereby controlling the manner of deformation of the material. Specifically, in the process of forming the protrusions W11 and W21, the control device 30 controls the temperature distribution of the material such that the temperature of the portion where a larger amount of deformation is desired is higher than the standard reference temperature of the portion, and the temperature of the portion where a smaller amount of deformation is desired is lower than the standard reference temperature of the portion. For example, when forming protrusions such as the protrusions W11 and W21, by controlling the temperature of the central portion of the protrusion to be lower than the standard reference temperature of the portion, the shape of the tip of the protrusion can be prevented from being excessively deformed. Also, by controlling the temperature of the portion around the protrusion to be higher than the standard reference temperature of the portion, the portion around the protrusion becomes more easily deformed, and the height of the protrusion can be easily ensured. By performing such control, when forming protrusions of a certain height, in the process of forming the protrusions W11 and W21, when forming protrusions of a certain shape, the load when pushing in the first pressing shaft 11 and the second pressing shaft 12 can be reduced.

[0069] (2) In the foregoing embodiment, an example in which the protruding portion 112 is provided as the shape of the tip portions of the first pressing shaft 11 and the second pressing shaft 12 is shown. However, the present invention is not limited to this, and as the shape of the tip portions of the first pressing shaft 11 and the second pressing shaft 12, other shapes such as a shape in which the protruding portion 112 is not provided and the entire tip portions of the first pressing shaft 11 and the second pressing shaft 12 become thinner in diameter as they approach the tip portion may also be used.

[0070] (3) In the above-described embodiment, an example was shown in which, in the step of forming the protrusions W11 and W21, data regarding the type of the material of the workpiece and data regarding the plate thickness of the material of the workpiece are input from the input device 5. However, the present invention is not limited to this, and as the data input from the input device 5, in addition to the data regarding the plate thickness of the material of the workpiece, either one of the data regarding the hardness of the material of the workpiece and the data regarding the tensile strength of the material of the workpiece, or both data may be further input. In that case, a database that determines the optimum pushing-in amount L1 based on the input data regarding the hardness of the material of the workpiece, the input data regarding the plate thickness of the material of the workpiece, and the input data regarding the tensile strength of the material of the workpiece may be used.

[0071] (4) In the above-described embodiment, an example was shown in which, in the step of forming the protrusions W11 and W21, data used to determine the optimum pushing-in amount L1, such as data regarding the type of the material of the workpiece and data regarding the plate thickness of the material of the workpiece, are input by an operator from the input device 5. However, the present invention is not limited to this, and the data used to determine the optimum pushing-in amount L1, such as data regarding the type of the material of the workpiece and data regarding the plate thickness of the material of the workpiece, may be input by data communication from another computer provided inside or outside the solid-phase bonding device 1.

[0072] (5) In the above-described embodiment, an example was shown in which, in the step of forming the protrusions W11 and W21, the optimum pushing-in amount L1 for the first workpiece W10 and the second workpiece W20 is determined in consideration of all of the first characteristic, the second characteristic, and the third characteristic. However, the present invention is not limited to this, and the optimum pushing-in amount L1 may be determined based on any one of the data regarding the hardness of the material of each workpiece, the data regarding the plate thickness, and the data regarding the tensile strength. Further, the optimum pushing-in amount L1 may be determined based on a combination of any two of the data regarding the hardness of the material of each workpiece, the data regarding the plate thickness, and the data regarding the tensile strength.

[0073] (6) As described in the foregoing embodiments, an example was shown in which, in the step of forming the protrusions W11 and W21, the optimal pushing amount L1 for each workpiece was determined in consideration of all of the first characteristic, the second characteristic, and the third characteristic. In that case, for all of the first characteristic, the second characteristic, and the third characteristic, the optimal pushing amount L1 may be determined without weighting, or the first characteristic, the second characteristic, and the third characteristic may be weighted to determine the optimal pushing amount L1.

[0074] [Explanation of the Effects of the Embodiment] In the embodiment described above, the following effects can be obtained.

[0075] (1) As shown in FIGS. 2 and 3, since the control device 30 controls the pushing amount L1 of the pair of pressing shafts 11 and 12 according to the material characteristics of the first workpiece W10 and the second workpiece W20, protrusions W11 and W21 having a constant height L2 can be formed in the solid-phase bonding. As a result, in the first workpiece W10 and the second workpiece W20, it is possible to suppress the occurrence of excessive or insufficient energization after the formation of the protrusions W11 and W21, and it is possible to suppress the insufficient strength of the first workpiece W10 and the second workpiece W20 after bonding.

[0076] (2) As shown in FIGS. 2 and 3, the control device 30 is configured such that the first characteristic (FIG. 3(A)), the second characteristic (FIG. 3(B)), and the third characteristic (FIG. 3(C)), which are the material characteristics of the first workpiece W10 and the second workpiece W20, correspond to the heights L2 of the protrusions W11 and W21 generated by the pushing of the pair of pressing shafts 11 and 12. Since the pushing amount L1 of the pair of pressing shafts 11 and 12 is controlled so as to be a reference value, the height L2 of the protrusions W11 and W21 can be set to a reference value of a height such that the strength of the workpiece after bonding can be ensured without excessive or insufficient current after the formation of the protrusions W11 and W21 according to the material characteristics.

[0077] (3) As shown in FIGS. 3(A) to 3(C), in the first characteristic (FIG. 3(A)), the second characteristic (FIG. 3(B)), and the third characteristic (FIG. 3(C)) which are the material characteristics of the first workpiece W10 and the second workpiece W20, control is performed to increase the pushing amount L1 as the deformation amount of the material with respect to the pushing amount L1 of the pair of pressing shafts 11, 12 becomes smaller. Therefore, even if the material characteristics are different, the height L2 of the protrusions W11, W21 formed by the pushing amount of the pair of pressing shafts 11, 12 can be made constant.

[0078] (4) As shown in FIGS. 3 and 4, when the control device 30 controls the pushing amount L1 of the pair of pressing shafts 11, 12 according to the material characteristics of the first workpiece W10 and the second workpiece W20, the material characteristics include at least any one of the first characteristic regarding the relationship between the hardness of the material shown in FIG. 3(A) and the pushing amount L1 of the pair of pressing shafts 11, 12, the second characteristic regarding the relationship between the plate thickness of the material shown in FIG. 3(B) and the pushing amount L1 of the pair of pressing shafts 11, 12, and the third characteristic regarding the relationship between the tensile strength of the material shown in FIG. 3(C) and the pushing amount L1 of the pair of pressing shafts 11, 12. Thereby, based on the main characteristics among the material characteristics of the first workpiece W10 and the second workpiece W20 in which the deformation amount of the material changes with respect to the pushing amount L1, the pushing amount L1 of the pair of pressing shafts 11, 12 can be controlled.

[0079] (5) As shown in FIGS. 2 and 3, in step S1, the material characteristics (the first characteristic, the second characteristic, the third characteristic) of the first workpiece W10 and the second workpiece W20 are acquired, and in steps S2 and S3, the pushing amount L1 of the pair of pressing shafts 11, 12 is controlled according to the material characteristics of the first workpiece W10 and the second workpiece W20. Therefore, protrusions W11, W21 having a constant height L2 can be formed in the solid-phase bonding. As a result, in the first workpiece W10 and the second workpiece W20, it is possible to suppress the occurrence of excessive or insufficient energization after the formation of the protrusions W11, W21, and it is possible to suppress the strength of the first workpiece W10 and the second workpiece W20 after bonding from becoming insufficient.

[0080] [Summary] (1) The solid-phase bonding device (solid-phase bonding device 1) of the present disclosure includes a pair of pressing shafts (first pressing shaft 11, second pressing shaft 12) that press a first workpiece (first workpiece W10) and a second workpiece (second workpiece W20) that are conductive and overlap in the thickness direction from both sides in the thickness direction, a pair of electrodes (first electrode 21, second electrode 22) respectively arranged around the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12), and a control device (control device 30). The control device (control device 30) controls the pushing amount (pushing amount L1) of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12) according to the material characteristics of the first workpiece (first workpiece W10) and the second workpiece (second workpiece W20).

[0081] According to such a configuration, since the control device controls the pushing amount of the pair of pressing shafts according to the material characteristics of the first workpiece and the second workpiece, it is possible to form protrusions of a certain height in solid-phase bonding. As a result, in the first workpiece and the second workpiece, it is possible to suppress the occurrence of excessive or insufficient energization after the formation of the protrusions, and it is possible to suppress the insufficient strength of the first workpiece and the second workpiece after bonding.

[0082] (2) In the solid-phase bonding device (solid-phase bonding device 1) of (1) above, the control device (control device 30) controls the pushing amount (pushing amount L1) of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12) so that the height (height L2) of the protrusions (protrusions W11, W21) generated by the pushing of the pair of pressing shafts becomes a reference value according to the material characteristics (first characteristic, second characteristic, third characteristic) of the first workpiece (first workpiece W10) and the second workpiece (second workpiece W20).

[0083] According to such a configuration, since the control device controls the pushing amount of the pair of pressing shafts so that the height of the protrusions generated by the pushing of the pair of pressing shafts becomes a reference value according to the material characteristics of the first workpiece and the second workpiece, it is possible to set the height of the protrusions to a reference value such that the strength of the workpiece after bonding can be sufficiently ensured without excessive or insufficient current after the formation of the protrusions according to the material characteristics.

[0084] (3) In the solid-phase bonding device (solid-phase bonding device 1) of (1) or (2), in the material characteristics (first characteristic, second characteristic, third characteristic) of the first workpiece (first workpiece W10) and the second workpiece (second workpiece W20), control is performed to increase the pushing amount (pushing amount L1) as the deformation amount of the material with respect to the pushing amount (pushing amount L1) of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12) becomes smaller.

[0085] According to such a configuration, in the material characteristics of the first workpiece and the second workpiece, control is performed to increase the pushing amount as the deformation amount of the material with respect to the pushing amount of the pair of pressing shafts becomes smaller. Therefore, even if the material characteristics are different, the height of the protrusion formed by the pushing amount of the pair of pressing shafts can be made a constant height.

[0086] (4) In the solid-phase bonding device (solid-phase bonding device 1) of any one of (1) to (3), the material characteristics (first characteristic, second characteristic, third characteristic) of the first workpiece (first workpiece W10) and the second workpiece (second workpiece W20) include at least any one of the first characteristic (first characteristic) regarding the relationship between the hardness of the material and the pushing amount of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12), the second characteristic (second characteristic) regarding the relationship between the plate thickness of the material and the pushing amount of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12), and the third characteristic (third characteristic) regarding the relationship between the tensile strength of the material and the pushing amount of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12).

[0087] According to such a configuration, as shown in FIGS. 3 and 4, when the control device controls the pushing-in amount of the pair of pressing shafts according to the characteristics of the materials of the first workpiece and the second workpiece, the characteristics of the materials include at least any one of a first characteristic regarding the relationship between the hardness of the material and the pushing-in amount of the pair of pressing shafts, a second characteristic regarding the relationship between the plate thickness of the material and the pushing-in amount L1 of the pair of pressing shafts, and a third characteristic regarding the relationship between the tensile strength of the material and the pushing-in amount L1 of the pair of pressing shafts. Thereby, based on the main characteristics among the characteristics of the materials of the first workpiece and the second workpiece in which the amount of deformation of the material changes with respect to the pushing-in amount, the pushing-in amount of the pair of pressing shafts can be controlled.

[0088] (5) The solid-phase bonding method of the present disclosure is a solid-phase bonding method using a solid-phase bonding device (solid-phase bonding device 1) including a pair of pressing shafts (first pressing shaft 11, second pressing shaft 12) that press a first workpiece (first workpiece W10) and a second workpiece (second workpiece W20) that are conductive and overlap in the thickness direction from both sides in the thickness direction, and a pair of electrodes (first electrode 21, second electrode 22) respectively arranged around the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12), the method including: a step (step S1) of obtaining the characteristics (first characteristic, second characteristic, third characteristic) of the materials of the first workpiece (first workpiece W10) and the second workpiece (second workpiece W20); and steps (steps S2, S3) of controlling the pushing-in amount (pushing-in amount L1) of the pair of pressing shafts (first pressing shaft 11, second pressing shaft 12) according to the characteristics (first characteristic, second characteristic, third characteristic) of the materials of the first workpiece (first workpiece W10) and the second workpiece (second workpiece W20).

[0089] According to such a configuration, as shown in FIGS. 2 and 3, the characteristics of the materials of the first workpiece W10 and the second workpiece W20 are obtained, and the pushing amount L1 of the pair of pressing shafts 11 and 12 is controlled according to the characteristics of the materials of the first workpiece W10 and the second workpiece W20, so that protrusions having a constant height can be formed in the solid-phase bonding. As a result, in the first workpiece and the second workpiece, it is possible to suppress the occurrence of excessive or insufficient energization after the formation of the protrusions, and it is possible to suppress the insufficient strength of the first workpiece and the second workpiece after bonding.

[0090] The embodiments disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present disclosure is shown not by the description of the above-described embodiments but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Description of Reference Numerals

[0091] 1 Solid-phase bonding device, W10 First workpiece, W20 Second workpiece, 11 First pressing shaft, 12 Second pressing shaft, 21 First electrode, 22 Second electrode, 30 Control device, L1 Pushing amount, W11, W21 Protrusions, L2 Height.

Claims

1. A pair of pressing shafts that press a first workpiece and a second workpiece that are conductive and overlap in the thickness direction from both sides in the thickness direction, A pair of electrodes respectively arranged around the pair of pressing shafts, And a control device, The control device is a solid-phase bonding device that controls the pushing amount of the pair of pressing shafts according to the characteristics of the materials of the first workpiece and the second workpiece.

2. The control device controls the pushing amount of the pair of pressing shafts so that the height of the protrusion generated by the pushing of the pair of pressing shafts becomes a reference value according to the characteristics of the materials of the first workpiece and the second workpiece. The solid-phase bonding device according to claim 1.

3. The control device performs control to increase the pushing amount as the deformation amount of the material with respect to the pushing amount of the pair of pressing shafts decreases in the characteristics of the materials of the first workpiece and the second workpiece. The solid-phase bonding device according to claim 1 or claim 2.

4. The characteristics of the materials of the first workpiece and the second workpiece include at least any one of a first characteristic regarding the relationship between the hardness of the material and the pushing amount of the pair of pressing shafts, a second characteristic regarding the relationship between the plate thickness of the material and the pushing amount of the pair of pressing shafts, and a third characteristic regarding the relationship between the tensile strength of the material and the pushing amount of the pair of pressing shafts. The solid-phase bonding device according to claim 1.

5. A pair of pressing shafts that press a first workpiece and a second workpiece that are conductive and overlap in the thickness direction from both sides in the thickness direction, A solid-phase bonding method using a solid-phase bonding device including a pair of electrodes respectively arranged around the pair of pressing shafts, A step of obtaining the characteristics of the materials of the first workpiece and the second workpiece, And a step of controlling the pushing amount of the pair of pressing shafts according to the characteristics of the materials of the first workpiece and the second workpiece. A solid-phase bonding method.

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