Joining member and method for manufacturing a joining member

Abstract

This disclosure provides a joining member and a method for manufacturing a joining member that can join a joint member to a hollow member with a simpler configuration. [Solution] The joining member 10 according to this disclosure is a joining member in which the end face S11 of a hollow member 11 is joined in a state in which it is close to the adjacent surface S12 of a joint member 12. One of the end face S11 of the hollow member 11 and the adjacent surface S12 of the joint member 12 has a first magnetic material, and the other of the end face of the hollow member and the adjacent surface of the joint member has a second magnetic material that is attracted to the first magnetic material by magnetic force, and the end face S11 of the hollow member 11 and the adjacent surface S12 of the joint member 12 are joined by attraction due to the magnetic force acting between the first magnetic material and the second magnetic material.

Description

Technical Field

[0001] The present disclosure relates to a joining member and a method for manufacturing the joining member.

Background Art

[0002] Patent Document 1 discloses a joint member that is inserted and welded to a hollow member.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=​​​​​​​​​​​​​​​In the joining member according to this disclosure, the hollow member and the joint member are made of magnetic material. Therefore, the joining member allows the joint member 12 to be joined to the hollow member with a simple configuration.

[0008] At least one of the first magnetic material and the second magnetic material is a reversible magnetic material that can be reversibly changed between a magnetic state and a non-magnetic state by at least a temperature change, and the joint state between the hollow member and the joint member may be released when the reversible magnetic material changes from the magnetic state to the non-magnetic state. With this configuration, the hollow member and the joint member can be disassembled with a simple configuration.

[0009] The reversible magnetic material can reversibly change between a magnetic state having a martensitic structure and a non-magnetic state having an austenite structure. By heating, it can change from the magnetic state to the non-magnetic state, releasing the bond between the hollow member and the joint member. By applying stress, it can change from the non-magnetic state to the magnetic state, restoring the bond between the hollow member and the joint member. With this configuration, the magnetic state having a martensitic structure and the non-magnetic state having an austenite structure can be reversibly changed by stress or heat, allowing the hollow member and the joint member to be joined and separated multiple times.

[0010] The method for manufacturing a joining member according to this disclosure is a method for manufacturing a joining member in which the end face of a hollow member is joined in a state in which the end face of the hollow member is close to the adjacent surface of the joint member, and the end face of the hollow member and the adjacent surface of the joint member may be joined by attracting them together with a magnetic force acting between a first magnetic material provided on one of the end face of the hollow member and the adjacent surface of the joint member and a second magnetic material provided on the other of the end face of the hollow member and the adjacent surface of the joint member.

[0011] In the joining member described herein, the hollow member and the joint member are made of magnetic material. Therefore, a joining member can be manufactured by joining the joint member to the hollow member using a simple configuration. [Effects of the Invention]

[0012] This disclosure provides a joining member and a method for manufacturing a joining member that can join a joint member to a hollow member with a simpler configuration. [Brief explanation of the drawing]

[0013] [Figure 1] This is a cross-sectional view of the joining member according to Embodiment 1. [Figure 2] This is a cross-sectional view of the joining member according to Embodiment 1. [Figure 3] This is a cross-sectional view of the joint member relating to the comparative example. [Figure 4] This figure shows cross-sectional views of the joining member according to Embodiment 1 and the joining member according to the comparative example. [Figure 5] This is a flowchart for joining a hollow member and a joint member. [Figure 6] This is a flowchart for disassembling the hollow member and the joint member. [Modes for carrying out the invention]

[0014] The present disclosure will be described below through embodiments of the invention, but the invention claimed is not limited to the following embodiments. Furthermore, not all of the configurations described in the embodiments are necessarily essential for solving the problem. For clarity of explanation, the following descriptions and drawings have been omitted and simplified as appropriate. In each drawing, the same elements are denoted by the same reference numerals, and redundant explanations have been omitted where necessary.

[0015] Of course, the right-handed xyz orthogonal coordinates shown in the drawings are for convenience in explaining the positional relationship of the components. Usually, the positive direction of the z-axis is vertically upward, and the xy plane is the horizontal plane.

[0016] (Embodiment 1) <Joint member> First, referring to FIGS. 1 and 2, the joint member according to Embodiment 1 will be described. FIGS. 1 and 2 are cross-sectional views of the joint member according to Embodiment 1. FIG. 1 is a cross-sectional view showing the state when joining the hollow member and the joint member, and FIG. 2 is a cross-sectional view showing the state when disassembling the hollow member and the joint member.

[0017] The joint member 10 shown in FIGS. 1 and 2 is used, for example, as a joint member of a vehicle that is assembled and disassembled at the destination. By using the vehicle that can be assembled and disassembled using the joint member 10 shown in FIGS. 1 and 2, it can be transported while maintaining a compact state. Therefore, more vehicles can be transported in one transportation, and the transportation cost can be reduced. Further, by using the joint member 10, the vehicle can be assembled and disassembled. For example, even if a part of the vehicle is damaged due to an accident or the like, it can be repaired by replacing the joint member 10. The joint member 10 is used, for example, as a vehicle skeleton member. The joint member 10 may be used, for example, for an instrument panel reinforcement, a roof, or a trunk lid.

[0018] As shown in FIGS. 1 and 2, the joint member 10 is composed of a hollow member 11 and a joint member 12. The hollow member 11 is, for example, a pipe. The joint member 12 shown in FIGS. 1 and 2 is a joint member having a T-shaped configuration, but is not limited thereto, and may be a joint member having an L-shaped configuration or the like.

[0019] The joint member 12 shown in FIGS. 1 and 2 includes an insertion portion 121 and engagement portions 122 and 123. The insertion portion 121 has a convex shape, and the tip of the convex portion can be inserted into the hole of the hollow member 11. When the insertion portion 121 is inserted into the hole of the hollow member 11, it is slidable in the x-axis direction along the inner surface of the hollow member 11. The engagement portions 122 and 123 are formed with holes so that a pipe (not shown) can be inserted.

[0020] <Joined state> Referring to FIG. 1, the joined state in which the hollow member 11 and the joint member 12 are joined will be described. As shown in FIG. 1, the insertion portion 121 of the joint member 12 is inserted into the hole of the hollow member 11, and the end face S11 of the hollow member 11 approaches the proximity face S12 of the joint member 12. Then, as shown in FIG. 1, the hollow member 11 and the joint member 12 are in a joined state with the end face S11 of the hollow member 11 approaching the proximity face S12 of the joint member 12.

[0021] Here, the state where the end face S11 of the hollow member 11 approaches the proximity face S12 of the joint member 12 includes a state where the end face S11 and the proximity face S12 are close to each other or in contact with each other. In the example shown in FIG. 1, it shows a state where the end face S11 and the proximity face S12 are close to each other.

[0022] The joining method of the hollow member 11 and the joint member 12 will be described. One of the end face S11 of the hollow member 11 and the proximity face S12 of the joint member 12 has a first magnetic body. The other of the end face S11 of the hollow member 11 and the proximity face S12 of the joint member 12 has a second magnetic body. The first magnetic body and the second magnetic body are composed of magnetic materials and are attracted to each other by magnetic force when brought close to each other.

[0023] Hereinafter, it will be described assuming that the end face S11 of the hollow member 11 has a first magnetic body and the proximity face S12 of the joint member 12 has a second magnetic body.

[0024] As shown in the upper part of Figure 1, when the tip of the insertion portion 121 of the joint member 12 is inserted into the hole of the hollow member 11, the first magnetic material on the end face S11 of the hollow member 11 and the second magnetic material on the proximity surface S12 of the joint member 12 are attracted to each other by magnetic force. As a result, the insertion portion 121 of the joint member 12 slides along the inner surface of the hollow member 11 in the negative x-axis direction. Then, as shown in the lower part of Figure 1, the end face S11 of the hollow member 11 and the proximity surface S12 of the joint member 12 come into close proximity. In this way, the hollow member 11 and the joint member 12 are joined together.

[0025] In this explanation, it has been assumed that the end face S11 of the hollow member 11 has a first magnetic material and the adjacent surface S12 of the joint member 12 has a second magnetic material. However, the explanation is not limited to this, and the entire hollow member 11 may have a first magnetic material and the joint member 12 may have a second magnetic material. In other words, the joining member 10 is sufficient if the hollow member 11 has a first magnetic material at least on its end face S11 and the joint member 12 has a second magnetic material at least on its adjacent surface S12.

[0026] Thus, in the joining member 10, the hollow member 11 and the joint member 12 are made of magnetic material, so the joined state can be maintained. Therefore, in the joining member 10, the joint member 12 can be joined to the hollow member 11 with a simple configuration.

[0027] <Disassembly> Referring to Figure 2, a method for disassembling the joint between the hollow member 11 and the joint member 12 will be explained. Disassembling the joint between the hollow member 11 and the joint member 12 means disassembling the joint member 10 into the hollow member 11 and the joint member 12.

[0028] Here, at least one of the first magnetic material of the hollow member 11 and the second magnetic material of the joint member 12 is made of a reversible magnetic material. A reversible magnetic material is a magnetic material that can reversibly change between a magnetic state and a non-magnetic state by at least a temperature change. Details about reversible magnetic materials will be described later. In the following explanation, it is assumed that the first magnetic material of the hollow member 11 is a magnetic material that is always magnetic, and the second magnetic material of the joint member 12 is a reversible magnetic material.

[0029] The joint member 10 shown in the upper part of Figure 2 is in a joined state. In the joined state, the second magnetic material of the joint member 12 is in a magnetic state. When the temperature of the joint member 12 is changed, for example, by heating, the second magnetic material of the joint member 12 changes from a magnetic state to a non-magnetic state. As a result, the magnetic force acting between the first magnetic material and the second magnetic material is lost. Then, as shown in Figure 2, when the insertion portion 121 of the joint member 12 is slid along the inner surface of the hollow member 11 in the positive x-axis direction, the joined state between the hollow member 11 and the joint member 12 is released.

[0030] Thus, in the joining member 10, at least one of the first magnetic material of the hollow member 11 and the second magnetic material of the joint member 12 is made of a reversible magnetic material. Therefore, by changing the temperature at least, the reversible magnetic material can be changed from a magnetic state to a non-magnetic state. The connection between the hollow member 11 and the joint member 12 can be released. Therefore, the joint member 10 allows the hollow member 11 and the joint member 12 to be disassembled with a simple configuration.

[0031] <Reversible magnetic material> Here, we will explain reversible magnetic materials. Reversible magnetic materials are typically stainless steels such as SUS304, and are magnetic materials that can reversibly change between a magnetic state having a martensitic structure and a non-magnetic state having an austenite structure.

[0032] Let's explain reversible magnetic materials in more detail using SUS304 as an example. SUS304 normally has an austenite structure and is non-magnetic. By applying stress to SUS304, the austenite structure transforms into a martensite (work-induced martensite) structure. As a result, SUS304 has a martensite structure and becomes magnetic. For example, if a hollow member or joint member made of SUS304 is processed and stress is applied at the destination, the hollow member or joint member made of SUS304 changes from a non-magnetic state to a magnetic state.

[0033] On the other hand, SUS304, which has a martensitic structure, undergoes a transformation from a martensitic structure to an austenitic structure (austenitization) when heated. The heat treatment is, for example, a solution treatment (solid solution treatment). As a result, the SUS304 has an austenitic structure and becomes non-magnetic. For example, by heat-treating a hollow member or joint member made of SUS304 at the destination, the hollow member or joint member made of SUS304 changes from a magnetic state to a non-magnetic state.

[0034] Thus, SUS304 can reversibly change between a magnetic state with a martensitic structure and a non-magnetic state with an austenite structure due to stress and heat.

[0035] In this explanation, SUS304 was used as an example of a reversible magnetic material to describe how its structure can be changed by stress or heat, thereby reversibly switching between magnetic and non-magnetic states. However, this is not the only example; a reversible magnetic material can also be a magnetic material that changes its structure by changing the temperature, thereby reversibly switching between magnetic and non-magnetic states.

[0036] Let's explain using SUS304 as an example. By sub-zero treatment, SUS304 transforms from an austenitic structure (non-magnetic state) to a martensitic structure (magnetic state). On the other hand, by solution treatment, SUS304 transforms from a martensitic structure (magnetic state) to an austenitic structure (non-magnetic state). In this way, SUS304 can be reversibly changed between magnetic and non-magnetic states by changing the structure by changing the temperature.

[0037] The SUS304 mentioned above is just one example of a reversible magnetic material. A reversible magnetic material can be any material that can change between a magnetic state and a non-magnetic state by changing the temperature, such as carbon steel.

[0038] <Joining member related to comparative example> Next, the joint members relating to the comparative example will be described with reference to Figure 3. Figure 3 is a cross-sectional view of the joint members relating to the comparative example. The joint members 20 and 30 shown in Figure 3 differ from the joint member 10 shown in Figure 1 in that they have different joint members.

[0039] In the joint member 22 shown in Figure 3, the length of the insertion portion 221 in the direction of the central axis C1 (x-axis direction) of the hollow member 11 is shorter than that of the joint member 12 shown in Figure 1. Also, as shown in Figure 3, a clearance d1 is provided from the end face S221 of the insertion portion 221 to the inner surface IS11 of the hollow member 11. By providing the clearance d1, the joint member 22 can be easily inserted into the hollow member 11.

[0040] In the joining member 20 shown in Figure 3, the end face S11 of the hollow member 11 and the end face S22 of the joint member 22 are welded together to join the hollow member 11 and the joint member 22. In the joining member 20, this welding ensures strength in the approximately vertical direction d2 with respect to the central axis C1 of the hollow member 11.

[0041] In the joint member 32 shown in Figure 3, the length of the insertion portion 321 in the direction of the central axis C1 of the hollow member 11 is longer than that of the joint member 12 shown in Figure 1. As a result, the contact surface between the hollow member 11 and the joint member 32 is increased in the joining member 30, ensuring strength in the direction of the central axis C1 (x-axis direction) of the hollow member 11. In addition, in the joining member 30, there is no clearance between the end face S321 of the insertion portion 321 and the inner surface IS11 of the hollow member 11.

[0042] In the joining member 30 shown in Figure 3, similar to the joining member 20 shown in Figure 3, the end face S11 of the hollow member 11 and the end face S32 of the joint member 32 are welded together to join the hollow member 11 and the joint member 32.

[0043] <Effects of joining using magnetic force> Let's compare the joining member 20 shown in Figure 3 with the joining member 10 shown in Figure 1. In the joining member 10 shown in Figure 1, when the hollow member 11 and the joint member 12 are brought close together, they are attracted by magnetic force, and the insertion part 121 is guided into the hole in the hollow member 11, so the clearance d1 shown in Figure 3 is unnecessary. In other words, with the joining member 10, insertion is easy because they are attracted by magnetic force even without providing a clearance from the end face of the insertion part 121 to the inner surface of the hollow member 11.

[0044] Furthermore, in the joining member 10 shown in Figure 1, the hollow member 11 and the joint member 12 are joined by magnetic force, eliminating the need for welding as in the joining member 20 shown in Figure 3. With the joining member 10, welding work is not required at the destination, thus reducing labor costs.

[0045] Furthermore, in the joining member 10 shown in Figure 1, the hollow member 11 and the joint member 12 are joined by magnetic force, so strength in the approximately vertical direction d2 with respect to the central axis C1 of the hollow member 11 can be secured without welding or adhesive fixing.

[0046] Furthermore, the joining member 20 shown in Figure 3 cannot be disassembled because it is fixed by welding or adhesive. In contrast, the joining member 10 shown in Figure 1 can be disassembled by changing the magnetic state and non-magnetic state by changing the temperature of at least one of the hollow member 11 and the joint member 12. Therefore, the joining member 10 can be joined and disassembled any number of times, making it a highly convenient joining member.

[0047] Let's compare the joining member 30 shown in Figure 3 with the joining member 10 shown in Figure 1. In the joining member 10 shown in Figure 1, the length of the insertion portion 121 in the direction of the central axis C1 of the hollow member 11 is shorter than that of the joint member 32 shown in Figure 3. In the joining member 10, since the hollow member 11 and the joint member 12 are joined by magnetic force, the strength in the direction of the central axis C1 (x-axis direction) of the hollow member 11 can be ensured without increasing the contact surface between the hollow member 11 and the joint member 12.

[0048] Here, if the length of the insertion portion 321 in the axial direction of the hollow member 11 is increased, as in the joining member 30, then strict dimensional accuracy is required so that the joint member 32 has appropriate cylindricity and coaxiality with respect to the inner diameter of the hollow member 11, making processing difficult.

[0049] In contrast, in the joining member 10 shown in Figure 1, the length of the insertion portion 121 in the axial direction of the hollow member 11 is shorter than that of the joint member 32 shown in Figure 3, making it easier to process compared to the joining member 30. Furthermore, in the joining member 10 shown in Figure 1, it is preferable that the length of the insertion portion 321 in the axial direction of the hollow member 11 is approximately the same as the inner diameter of the hollow member 11.

[0050] Thus, the joining member 10 is a joining member that ensures strength in the axial direction of the hollow member 11 and in a direction substantially perpendicular to the axial direction of the hollow member 11. Furthermore, since the joining member 10 does not require welding or adhesive fixing, it can be joined and disassembled any number of times.

[0051] Furthermore, the joining member 10 may be joined to the hollow member 11 and the joint member 12 by welding or adhesive, thereby ensuring strength in the axial direction of the hollow member 11 and in a direction substantially perpendicular to the axial direction of the hollow member 11.

[0052] Next, we will compare the joining member 10 and the joining member 20 with reference to Figure 4. Figure 4 is a diagram showing cross-sectional views of the joining member according to Embodiment 1 and the joining member according to the comparative example. The upper part of Figure 4 is a cross-sectional view of the joining member according to Embodiment 1, and the lower part of Figure 4 is a cross-sectional view of the joining member according to the comparative example.

[0053] As shown in Figure 4, a predetermined distance L1 is maintained between the joint members 12 or between the joint members 22, and a hollow member 11 is provided between the joint members 12 or between the joint members 22.

[0054] As shown in the lower part of Figure 4, in the joining member 20, the end face S11 and the adjacent face S12 are in contact on the right side. On the left side of the joining member 20, there is a gap between the end face S11 and the adjacent face S12. Thus, in the joining member 20, there is no gap on the right side and there is a gap on the left side, so the strength on the left side is lower than the strength on the right side, and the overall strength of the joining member 20 is uneven. Therefore, there is a risk of breakage in the joining member 20 due to the presence of areas with reduced strength.

[0055] On the other hand, as shown in the upper part of Figure 4, in the joining member 10, the end face S11 and the adjacent surface S12 are in close proximity on the right side. In the joining member 10, the end face S11 and the adjacent surface S12 are in close proximity on the left side, similar to the right side. In this way, in the joining member 10, the hollow member 11 and the joint member 12 are attracted to each other by magnetic force, and on both the left and right sides, the end face S11 and the adjacent surface S12 are in close proximity with the same predetermined distance between them. Therefore, the strength of the joining member 10 is uniform overall. As a result, there are no parts in the joining member 10 with reduced strength, and thus damage can be suppressed.

[0056] <Manufacturing method> The manufacturing method for the joining member will be explained with reference to Figures 5 and 6. Figures 5 and 6 are flowcharts showing the manufacturing method for the joining member. Figure 5 is a flowchart for joining the hollow member and the joint member. Figure 6 is a flowchart for disassembling the hollow member and the joint member.

[0057] In the following explanation, it is assumed that the end face of the hollow member has a first magnetic material, and the adjacent surface of the joint member has a second magnetic material. Furthermore, it is assumed that the first magnetic material is always magnetic, and the second magnetic material is reversible.

[0058] As shown in Figure 5, the tip of the insertion part of the joint member is inserted into the hole of the hollow member (step ST1). This causes the first magnetic material on the end face of the hollow member and the second magnetic material on the adjacent surface of the joint member to attract each other by magnetic force, and the insertion part of the joint member slides along the inner surface of the hollow member through the hole. This results in a joined state where the hollow member and the joint member are joined together (step ST2). In this way, a joined member in which the hollow member and the joint member are joined can be manufactured.

[0059] As shown in Figure 6, the reversible magnetic material (joint member) is heated (step ST3). This causes the joint member to change from a magnetic state to a non-magnetic state. As a result, the magnetic force acting between the first magnetic material (hollow member) and the second magnetic material (joint member) is lost. The joint state in which the hollow member and the joint member are joined is then released (step ST4). In this way, the hollow member and the joint member are separated.

[0060] Although not shown in Figures 5 and 6, the following process is performed when rejoining the disassembled hollow member and joint member. First, the reversible magnetic material (joint member) is changed from a non-magnetic state to a magnetic state by changing its temperature. This causes a magnetic force to act again between the first magnetic material (hollow member) and the second magnetic material (joint member). As a result, the magnetic force acting between the first and second magnetic materials causes the hollow member and the joint member to be joined again.

[0061] Thus, by using a simple configuration in which the hollow member and joint member are made of magnetic material, a jointed member can be manufactured in which the joint member is joined to the hollow member. Furthermore, by making at least one of the magnetic materials of the hollow member and the joint member a reversible magnetic material, a jointed member can be manufactured in which the hollow member and the joint member can be separated.

[0062] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its intent. [Explanation of symbols]

[0063] 10, 20, 30 Joining members 11 Hollow member 12, 22, 32 Joint members 121, 221, 321 Insertion section 221 Insertion section 321 Insertion part C1 center axis d1 clearance IS11 Inner S11 end face S12 Proximity surface S221 End face S321 end face

Claims

1. A joining member in which the end face of a hollow member is joined in a state where it is close to the adjacent surface of the joint member, The end face of the hollow member and the adjacent face of the joint member have a first magnetic material. The other end face of the hollow member and the adjacent face of the joint member have a second magnetic material that is attracted to the first magnetic material by magnetic force, The end face of the hollow member and the adjacent face of the joint member are attracted to each other by the magnetic force acting between the first magnetic material and the second magnetic material, resulting in a joined state where the hollow member and the joint member are joined together. Joining member.

2. At least one of the first magnetic material and the second magnetic material is a reversible magnetic material that can be reversibly changed between a magnetic state and a non-magnetic state by changing the temperature at least. The reversible magnetic material changes from the magnetic state to the non-magnetic state, thereby releasing the connection between the hollow member and the joint member. The joining member according to claim 1.

3. The aforementioned reversible magnetic material is The magnetic state having a martensitic structure and the non-magnetic state having an austenite structure are reversibly changed. By heating, the magnetic state changes to the non-magnetic state, and the bond between the hollow member and the joint member is released. By applying stress, the state changes from non-magnetic to magnetic, and the hollow member and the joint member become joined. The joining member according to claim 2.

4. A method for manufacturing a joint member in which the end face of a hollow member is joined in a state in which it is close to the adjacent surface of a joint member, The magnetic force acting between the first magnetic material provided on one of the end face of the hollow member and the adjacent surface of the joint member, and the second magnetic material provided on the other end face of the hollow member and the adjacent surface of the joint member, The end face of the hollow member and the adjacent face of the joint member are brought together to join the hollow member and the joint member. A method for manufacturing a joining member.

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