Next method

Abstract

To provide an adhesion method capable of surely adhering a buffer member to a stabilizer irrespective of an outer temperature, while suppressing deterioration of productivity.SOLUTION: An adhesion method according to the present invention is an adhesion method for adhering a bush to a member to be adhered, comprising: applying an adhesive to a portion adhering to the member to be adhered of a buffer member; first heating for heating a buffer member adhering portion of the member to be adhered; second heating for heating the buffer member adhesion portion of the member to be adhered after the first heating; and assembling the buffer member to the member to be adhered after the second heating.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an adhesion method.

Background Art

[0002] A stabilizer used in a vehicle or the like is attached to the vehicle to stabilize the posture of the vehicle. A bush is provided as a buffer member for alleviating a collision or the like between the stabilizer and the body at a connection portion of the stabilizer to the vehicle body, and the stabilizer and the vehicle body are connected via the bush. The bush is formed using an elastic member such as rubber, and suppresses the transmission of vibration of the stabilizer to the body. Generally, the bush is composed of two members, and after an adhesive is applied to a contact surface of the stabilizer which is an adherend member, it is attached to the stabilizer by vulcanization adhesion (for example, refer to Patent Document 1). During vulcanization adhesion, the bush adhesion portion of the stabilizer is heated. As a heating method at this time, for example, an induction heating coil is adopted (for example, refer to Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, since the temperature of the stabilizer due to heating varies greatly depending on the outside air temperature, for example, it was necessary to change the heating time for each season. Such a review of the heating conditions led to an increase in the working process and working time, and a decrease in productivity.

[0005] The present invention has been made in view of the above, and aims to provide an adhesive method that can reliably bond a buffer member to a member to be bonded regardless of the ambient temperature, while suppressing a decrease in productivity. [Means for solving the problem]

[0006] To solve the above-mentioned problems and achieve the objective, the bonding method according to the present invention is a bonding method for bonding a buffer member to a member to be bonded, and is characterized by comprising: an adhesive application step of applying an adhesive to the portion of the buffer member to be bonded to the member to be bonded; a first heating step of heating the portion of the member to be bonded to the buffer member; a second heating step of heating the portion of the member to be bonded to the buffer member after the first heating step; and an assembly step of assembling the buffer member to the member to be bonded after the second heating step.

[0007] Furthermore, the bonding method according to the present invention is characterized in that it further includes a surface processing step of performing surface processing on the member to be bonded before the second heating step.

[0008] Furthermore, the bonding method according to the present invention is characterized in that it further includes a uniformization step of making the temperature of the members to be bonded uniform after the first heating step.

[0009] Furthermore, the bonding method according to the present invention is characterized in that, in the above invention, the first heating step is to heat the member to be bonded using a near-infrared lamp, and the second heating step is to heat the member to be bonded using an induction heating method. [Effects of the Invention]

[0010] According to the present invention, the cushioning member can be reliably bonded to the stabilizer regardless of the ambient temperature, while suppressing a decrease in productivity. [Brief explanation of the drawing]

[0011] [Figure 1]Figure 1 is a perspective view showing an example of a stabilizer manufactured in Embodiment 1 of the present invention. [Figure 2] Figure 2 shows the configuration near the bushing member in the stabilizer shown in Figure 1. [Figure 3] Figure 3 is a diagram illustrating the bushing bonding process to the stabilizer shown in Figure 1. [Figure 4] Figure 4 is a flowchart showing the flow of the bush bonding process according to Embodiment 1. [Figure 5] Figure 5 is a diagram illustrating the bush preheating process. [Figure 6] Figure 6 is a diagram (part 1) illustrating the arrangement of the heater and reflector. [Figure 7] Figure 7 is a diagram (part 2) illustrating the arrangement of the heater and reflector. [Figure 8] Figure 8 is a diagram illustrating the bushing bonding process. [Figure 9] Figure 9 is a diagram (part 1) illustrating the arrangement of the heater and reflector according to modification 1 of Embodiment 1. [Figure 10] Figure 10 is a diagram (part 2) illustrating the arrangement of the heater and reflector according to modification 1 of Embodiment 1. [Figure 11] Figure 11 is a diagram (part 1) illustrating the arrangement of the heater and reflector according to a modified example 2 of Embodiment 1. [Figure 12] Figure 12 is a diagram (part 2) illustrating the arrangement of the heater and reflector according to a modified example 2 of Embodiment 1. [Figure 13] Figure 13 is a diagram (part 1) illustrating the arrangement of the heater and reflector according to modification 3 of Embodiment 1. [Figure 14] Figure 14 is a diagram (part 2) illustrating the arrangement of the heater and reflector according to modification 3 of Embodiment 1. [Figure 15] Figure 15 is a diagram (part 1) illustrating the arrangement of the heater according to modification 4 of Embodiment 1. [Figure 16] FIG. 16 is a diagram (part 2) for explaining the arrangement of the heater according to Modification 4 of Embodiment 1. [Figure 17] FIG. 17 is a flowchart showing the process flow of the bushing adhesion process according to Embodiment 2. [Figure 18] FIG. 18 is a flowchart showing the process flow of the bushing adhesion process according to Embodiment 3.

MODE FOR CARRYING OUT THE INVENTION

[0012] Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as "embodiments") will be described with reference to the accompanying drawings. The drawings are schematic, and the relationship between the thickness and width of each part, the ratio of the thickness of each part, etc. may be different from the actual ones, and there may be parts where the dimensional relationship and ratio are different between the drawings.

[0013] (Embodiment 1) FIG. 1 is a perspective view showing an example of a stabilizer manufactured in Embodiment 1 of the present invention. FIG. 2 is a diagram showing the configuration near the bushing member in the stabilizer shown in FIG. 1. The stabilizer 1 is formed of metal or various fibers (for example, carbon fibers). The stabilizer 1 has a main body portion 2 whose both ends are bent and the central portion extends linearly, and a bushing member 3 attached to the main body portion 2.

[0014] The main body portion 2 extends in a columnar shape, for example, a cylindrical shape, and both ends are bent. The main body portion 2 may be solid or hollow.

[0015] For example, when the stabilizer 1 is provided in an automobile, one end is connected to one of the suspensions arranged on the left and right, and the other end is connected to the other suspension. At this time, each end is fixed to the suspension through a through hole. The stabilizer 1 is also fixed to the vehicle body through the bushing member 3.

[0016] The stabilizer 1 is manufactured by processing a base material. For example, a columnar base material is bent, then both ends are pressed to flatten it into a plate shape, and through holes are formed at each end.

[0017] The bushing member 3 includes a bushing 31 and a bracket 32. The bracket 32 ​​is attached to the vehicle body via screws or the like, and supports the main body 2 via the bushing 31.

[0018] The bush 31 is formed using an elastic material such as rubber or an elastic resin, and functions as a cushioning member to mitigate collisions between the stabilizer 1 and the body. The bush 31 consists of two members (a first member 311 and a second member 312). The bush 31 is formed by sandwiching the main body 2 between the first member 311 and the second member 312 and bonding them to the main body 2.

[0019] Next, the bonding process for attaching the bushing 31 to the main body 2 will be explained with reference to Figures 3 to 8. Figure 3 is a diagram illustrating the bushing bonding process to the stabilizer shown in Figure 1. Figure 4 is a flowchart showing the flow of the bushing bonding process according to Embodiment 1.

[0020] First, the bush 31 is cleaned (step S101). For example, as shown in Figure 3(a), the first member 311 and the second member 312 constituting the bush 31 are cleaned in the cleaning machine 101. After cleaning, the first member 311 and the second member 312 are subjected to a drying process.

[0021] After the cleaning process, adhesive is applied to the first member 311 and the second member 312 (step S102: adhesive application step). For example, as shown in Figure 3(b), the adhesive is applied to the bonding surfaces of the main bodies of the first member 311 and the second member 312 by the nozzle 102. After the adhesive is applied, the first member 311 and the second member 312 are subjected to a drying process. After that, the first member 311 and the second member 312 are set in the jig 103. The jig 103 is composed of, for example, a first jig 103a that holds the first member 311 and a second jig 103b that holds the second member 312.

[0022] Meanwhile, the main body 2 is preheated at the bonding portion of the bush 31 (step S103: first heating step, see Figure 3(d)). Figure 5 is a diagram illustrating the bush preheating process. Figures 6 and 7 illustrate the arrangement of the heater and reflector. Figure 6 is a view of the heating portion of the main body 2 from the longitudinal direction. Figure 7 is a view of the heating portion of the main body 2 from a direction perpendicular to the longitudinal direction and from the longitudinal direction of the near-infrared lamp.

[0023] In this embodiment 1, the main body 2 is preheated using two near-infrared lamps 104 that emit near-infrared light and a reflector 105. Each near-infrared lamp 104 extends perpendicularly to the longitudinal direction of the heating portion of the main body 2 and is provided on the same side of the main body 2. The reflector 105 has a reflective surface that reflects heat and light, and this reflective surface is provided in a position opposite the near-infrared lamps 104 to the main body 2. During the preheating process, near-infrared light from the near-infrared lamps 104 is irradiated onto the heating portion of the main body 2, and the near-infrared light reflected by the reflector 105 is irradiated onto the portion of the main body 2 opposite to the near-infrared lamps 104.

[0024] After preheating, the main body 2 is subjected to plasma treatment (step S104: surface treatment step). The main body 2 is surface treated by the plasma treatment. For example, as shown in Figure 3(e), the surface of the main body 2 is subjected to plasma treatment by the plasma nozzle 106. This plasma treatment may be carried out, for example, in an unheated room temperature space, or in a space heated to above room temperature.

[0025] After plasma treatment, the main body 2 is subjected to the main heat treatment (step S105: second heating step). For this heat treatment, induction heating (IH) is used, for example. For example, as shown in Figure 3(f), the adhesive surfaces of the first member 311 and the second member 312 to the main body are heated by the IH coil 107. For example, in this heat treatment, the main body 2 is heated for several tens of seconds. The temperatures for this heat treatment and the preheat treatment are set appropriately depending on the type of bushing 31 and adhesive. Here, the target temperature of the main body 2 to be reached during the preheat treatment is set to a temperature higher than the target temperature to be reached during this heat treatment, for example, room temperature (ambient temperature), and 30% to 90% of the target temperature for this heating. In this heat treatment, for example, the target temperature of the heated part is set in the range of 150°C to 300°C.

[0026] The first member 311 and the second member 312 are set in the jig 103, and the main body 2 is subjected to the heat treatment, at which point the bushing assembly process is carried out (step S106: see Figure 3(g)). Figure 8 is a diagram illustrating the bushing bonding process. As shown in Figure 8, the first jig 103a, which holds the first member 311, and the second jig 103b, which holds the second member 312, are assembled to the heating section 2a of the main body 2. At this time, adhesive 313 is applied to the parts of the first member 311 and the second member 312 that are bonded to the main body 2.

[0027] After assembling the jig 103 to the main body 2, a compression and holding process is performed to bond the bushing 31 to the main body 2 (step S107). The compression and holding process is performed, for example, for the time required for vulcanization bonding to be completed, during which the assembled parts are held in place. During this time, the main body 2 and the bushing 31 are bonded together by pressure and the heat of the main body 2.

[0028] Subsequently, by removing the first jig 103a from the first member 311 and the second jig 103b from the second member 312, a stabilizer 1 with the bush 31 fixed to the main body 2 is obtained.

[0029] In the embodiment 1 of the present invention described above, a preheating treatment is performed in which the bonding portion of the bush 31 of the main body 2 is heated in advance before the main heat treatment is carried out. By preheating before the main heating, the temperature of the heating portion during the main heating can be made high. According to this embodiment 1, the bush 31 can be reliably bonded to the stabilizer regardless of the ambient temperature while suppressing a decrease in productivity.

[0030] Furthermore, in this embodiment 1, since the preheating treatment is performed using near-infrared rays, which have high heat transfer efficiency, the main body 2 can be reliably heated.

[0031] (Modification 1 of Embodiment 1) Next, a modification 1 of Embodiment 1 of the present invention will be described with reference to Figures 9 and 10. Figures 9 and 10 illustrate the arrangement of the heater and reflector according to modification 1 of Embodiment 1. Figure 9 is a view of the heating portion of the main body 2 from the longitudinal direction. Figure 10 is a view of the heating portion of the main body 2 from a direction perpendicular to the longitudinal direction and from the longitudinal direction of the near-infrared lamp.

[0032] In this modified example 1, the main body 2 is preheated using a single near-infrared lamp 104 that emits near-infrared light and a reflector 105. The near-infrared lamp 104 is installed above the heating portion of the main body 2. The reflector 105 is installed so that its reflective surface faces the near-infrared lamp 104 relative to the main body 2. During the preheating process, near-infrared light from the near-infrared lamp 104 is irradiated onto the heating portion of the main body 2, and the near-infrared light reflected by the reflector 105 is irradiated onto the portion of the main body 2 opposite to the near-infrared lamp 104.

[0033] As shown in Modification 1, even when using a single near-infrared lamp 104, by performing a preheating treatment to heat the bonding portion of the bushing 31 of the main body 2 before carrying out the main heat treatment, the bushing 31 can be reliably bonded to the stabilizer regardless of the ambient temperature.

[0034] (Modification 2 of Embodiment 1) Next, a modification 2 of Embodiment 1 of the present invention will be described with reference to Figures 11 and 12. Figures 11 and 12 illustrate the arrangement of the heater and reflector according to modification 2 of Embodiment 1. Figure 11 is a view of the heating portion of the main body 2 from the longitudinal direction. Figure 12 is a view of the heating portion of the main body 2 from a direction perpendicular to the longitudinal direction and from the longitudinal direction of the near-infrared lamp. In this modification 2, a reflector 105A is provided instead of the reflector 105 of Embodiment 1.

[0035] The reflector 105A has a concave, curved reflective surface, and this reflective surface is positioned opposite the near-infrared lamp 104 relative to the main body 2. During the preheating process, near-infrared rays from the near-infrared lamp 104 are irradiated onto the heating portion of the main body 2, and the near-infrared rays reflected by the reflector 105 are irradiated onto the portion of the main body 2 opposite to the near-infrared lamp 104. In this process, because the reflective surface is curved, the near-infrared rays are reflected toward the main body 2, allowing the main body 2 to be heated more efficiently.

[0036] According to Modification 2, similar to Embodiment 1, by performing a preheating treatment in which the bonding portion of the bushing 31 of the main body 2 is heated in advance before carrying out the main heat treatment, the bushing 31 can be reliably bonded to the stabilizer regardless of the ambient temperature.

[0037] Furthermore, in the modified example 2, the reflective surface of the reflector plate 105A is made concave, and the reflected near-infrared rays are concentrated on the main body 2, thereby more reliably heating the main body 2 on the side opposite to the near-infrared lamp 104.

[0038] (Modification 3 of Embodiment 1) Next, a third modification of Embodiment 1 of the present invention will be described with reference to Figures 13 and 14. Figures 13 and 14 illustrate the arrangement of the heater and reflector according to the third modification of Embodiment 1. Figure 13 is a view of the heating portion of the main body 2 from the longitudinal direction. Figure 14 is a view of the heating portion of the main body 2 from a direction perpendicular to the longitudinal direction and from the longitudinal direction of the near-infrared lamp.

[0039] In this modified example 3, the main body 2 is preheated using a single near-infrared lamp 104 that emits near-infrared light and a reflector 105A. The near-infrared lamp 104 is installed above the heating portion of the main body 2. The reflector 105A is installed so that its reflective surface faces the near-infrared lamp 104 relative to the main body 2. During the preheating process, near-infrared light from the near-infrared lamp 104 is irradiated onto the heating portion of the main body 2, and the near-infrared light reflected by the reflector 105A is irradiated onto the portion of the main body 2 opposite to the near-infrared lamp 104.

[0040] As shown in Modification 3, even when using a single near-infrared lamp 104, by performing a preheating treatment to heat the bonding portion of the bushing 31 of the main body 2 before carrying out the main heat treatment, the bushing 31 can be reliably bonded to the stabilizer regardless of the ambient temperature.

[0041] In addition, in Modified Example 3, similar to Modified Example 2, by making the reflecting surface of the reflector 105A concave and concentrating the reflected near-infrared rays on the main body 2, the main body 2 on the side opposite to the near-infrared lamp 104 side can be heated more reliably.

[0042] (Modified Example 4 of Embodiment 1) Next, Modified Example 4 of Embodiment 1 of the present invention will be described with reference to FIGS. 15 and 16. FIGS. 15 and 16 are diagrams for explaining the arrangement of the heater and the reflector according to Modified Example 4 of Embodiment 1. FIG. 15 is a view seen from the longitudinal direction in the heating portion of the main body 2. FIG. 16 is a view seen from a direction perpendicular to the longitudinal direction in the heating portion of the main body 2 and in the longitudinal direction of the near-infrared lamp. In this Modified Example 4, instead of the reflector 105 of Embodiment 1, two near-infrared lamps 104 are provided.

[0043] In this Modified Example 4, the four near-infrared lamps 104 are arranged in pairs so as to face each other with respect to the main body 2. The preheating treatment irradiates the heating portion of the main body 2 with near-infrared rays from both sides of the near-infrared lamp 104.

[0044] According to Modified Example 4, similar to Embodiment 1, by performing a preheating treatment for preliminarily heating the bonding portion of the bush 31 of the main body 2 before performing the main heat treatment, the bush 31 can be surely bonded to the stabilizer regardless of the outside air temperature.

[0045] In addition, in Modified Example 4, the main body 2 can be heated more reliably by the near-infrared lamps 104 arranged at positions facing each other with respect to the main body 2.

[0046] (Embodiment 2) Next, Embodiment 2 of the present invention will be described with reference to FIG. 17. FIG. 17 is a flowchart showing the flow of the bush bonding process according to Embodiment 2. The configuration of the stabilizer 1 according to Embodiment 2 is the same as that of Embodiment 1. Hereinafter, the method of bonding the bush 31 according to the present Embodiment 2 will be described.

[0047] The bonding method according to Embodiment 2 involves cleaning the bush 31 (step S201) and applying adhesive to the first member 311 and the second member 312 (step S202), in the same manner as steps S101 and S102 in Figure 4 described above.

[0048] Meanwhile, the main body 2 is subjected to plasma treatment (step S203). The plasma treatment provides a surface treatment to the main body 2 (see, for example, Figure 3(e)).

[0049] After plasma treatment, the main body 2 is preheated (step S204). For example, as shown in Figure 3(d), the bushing 31 bonding portion of the main body 2 is heated using two near-infrared lamps 104 that emit near-infrared light and a reflector 105.

[0050] After preheating, the main body 2 is subjected to the same heating treatment as in steps S105 to S107 of Figure 4 described above (step S205), the first member 311 and the second member 312 are set in the jig 103 and the bush assembly process is performed (step S206), and a compression holding process is performed to bond the bush 31 to the main body 2 (step S207).

[0051] Subsequently, the first jig 103a is removed from the first member 311, and the second jig 103b is removed from the second member 312, thereby completing the crimping of the bushing 31 to the main body 2.

[0052] The second embodiment of the present invention described above, like the first embodiment, involves a preheating treatment in which the bonding portion of the bushing 31 of the main body 2 is heated in advance before the main heat treatment is performed. This allows the temperature of the heated portion to be raised to a high temperature regardless of the ambient temperature. According to this second embodiment, the bushing 31 can be reliably bonded to the stabilizer regardless of the ambient temperature.

[0053] In Embodiment 2 of the present invention, although the preheating treatment and the main heating treatment are performed continuously, the main body 2 is heated by the preheating treatment without temperature monitoring, and the main body 2 is heated by performing temperature monitoring in the main heating treatment, so that it is possible to heat efficiently and reliably.

[0054] (Embodiment 3) Next, Embodiment 3 of the present invention will be described with reference to FIG. 18. FIG. 18 is a flowchart showing the flow of the bush adhesion process according to Embodiment 3. The configuration of the stabilizer 1 according to Embodiment 3 is the same as that of Embodiment 1. Hereinafter, the method of adhering the bush 31 according to the present Embodiment 3 will be described.

[0055] The adhesion method according to Embodiment 3 is the same as Steps S201 to S204 in FIG. 17 described above, and includes cleaning of the bush 31 (Step S301), application of an adhesive to the first member 311 and the second member 312 (Step S302), plasma treatment of the main body 2 (Step S303), and preheating treatment of the main body 2 (Step S304).

[0056] After the preheating treatment, the heating portion of the main body 2 is made uniform (Step S305: uniformization step). In the uniformization process, the temperature of the bush adhesion portion is made uniform by leaving the heating portion for a predetermined time.

[0057] After the uniformization process, the main body 2 is subjected to the main heating treatment (Step S306) in the same manner as Steps S205 to 207 in FIG. 17 described above, the first member 311 and the second member 312 are set on the jig 103, and the bush assembling process is performed (Step S307), and the crimping holding process for adhering the bush 31 to the main body 2 is performed (Step S308).

[0058] Thereafter, the first jig 103a is removed from the first member 311, and the second jig 103b is removed from the second member 312, whereby the crimping of the bush 31 to the main body 2 is completed.

[0059] The third embodiment of the present invention described above, like embodiments 1 and 2, involves a preheating treatment in which the bonding portion of the bush 31 of the main body 2 is heated in advance before the main heat treatment is performed. This allows the temperature of the heated portion to be raised to a high temperature regardless of the ambient temperature. According to this second embodiment, the bush 31 can be reliably bonded to the stabilizer regardless of the ambient temperature.

[0060] Furthermore, according to this embodiment 3, since a heat uniformization treatment is performed between the preheating treatment and the main heat treatment, temperature unevenness in the bushing bonding area can be reduced.

[0061] In this third embodiment, if the main body plasma treatment is performed during the homogenization process, the processing time in the main body plasma treatment of the first embodiment (Figure 4: step S104) may be adjusted to the time required for homogenization.

[0062] While embodiments for carrying out the present invention have been described so far, the present invention should not be limited to the embodiments described above. For example, it is applicable to products manufactured by heat-sealing.

[0063] Furthermore, in the embodiments described above, an example was described in which a near-infrared lamp was used as the heating element for preheating and an IH coil was used as the heating element for the main heating process. However, the heating elements are not limited to these, and known elements (for example, heating by electric current or heating by hot air) can be used and selected as appropriate according to heating efficiency, etc.

[0064] Furthermore, while the above-described embodiment explained an example in which a bushing connecting to the vehicle body is bonded to a stabilizer, the method is not limited to stabilizers. It is applicable to any bonded member to which a cushioning member is bonded, which is interposed between the bonded members to mitigate collisions between the bonded members, and to which the cushioning member is bonded by heating. Examples of bonded members include stabilizers, coil springs, leaf springs, torsion bars, disc springs, etc. For example, an insulator is used as a cushioning member for a coil spring.

[0065] Thus, the present invention may include various embodiments not described herein, and various design modifications can be made without departing from the technical idea specified by the claims.

[0066] As described above, the bonding method according to the present invention is suitable for reliably bonding a buffer member to a member to be bonded regardless of the ambient temperature, while suppressing a decrease in productivity. [Explanation of symbols]

[0067] 1 Stabilizer 2 Main body 3. Bushing component 31 Bush 32 brackets 101 Washing machine 102 Nozzles 103 Jig 103a First Jig 103b Second Jig 104 Near-infrared lamp 105, 105A Reflector 106 Plasma Nozzle 107 IH coil 311 First Member 312 Second Member

Claims

1. A bonding method for bonding a cushioning member to a member to be bonded, The adhesive application step involves applying an adhesive to the portion of the cushioning member that is to be bonded to the member to be bonded, which will bond the members together by vulcanization. A first heating step involves heating the portion of the member to be bonded to the buffer member, After the first heating step, a second heating step is performed to heat the portion of the member to be bonded that has been heated by the first heating step, After the second heating step, an assembly step is performed in which the buffer member is assembled to the member to be bonded, which has been heated by the second heating step. Includes, In the first heating step, the heating temperature of the buffer member bonding portion is set to a temperature higher than room temperature and 30% to 90% of the heating temperature in the second heating step, relative to the target temperature to be reached in the second heating step. The heating temperature of the buffer member bonding portion in the second heating step is set based on the bonding temperature of the adhesive. A bonding method characterized by the following features.

2. A surface treatment step in which surface treatment is performed on the member to be bonded before the second heating step, The bonding method according to claim 1, further comprising:

3. A uniformizing step to equalize the temperature of the members to be bonded after the first heating step and before the second heating step, The bonding method according to claim 1 or 2, further comprising:

4. The first heating step involves heating the member to be bonded using a near-infrared lamp, The second heating step involves heating the member to be bonded by induction heating. The bonding method according to any one of features 1 to 3.

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