Joining structure of steel plates

Abstract

The problem to be solved by the present invention is to provide a steel plate joining structure which suppresses deterioration of an adhesive material and has transportable rigidity. In order to solve the above problem, the joining structure (1) for steel plates according to the present invention comprises: a thermosetting adhesive material (30) provided between two steel plates (21, 22); a heat-generating member (4) that is provided inside the thermosetting adhesive material (30) and generates heat upon receiving an external stimulus; and a surrounding member (5) having lower thermal conductivity than the heat generating member (4) and surrounding at least a portion of the heat generating member (4). A steel plate joint structure (1A) is provided with: a thermosetting adhesive material (30A) provided between two steel plates (21, 22); and a heat-generating member (4A) which is provided inside the thermosetting adhesive material (30A) and which generates heat upon receiving a stimulus from the outside. A heat generating member (4A) is linearly provided on an adhesive member (3A) in which two steel plates (21, 22) are adhered by means of a thermosetting adhesive material (30A).

Description

Technical Field

[0001] The present disclosure relates to a joint structure of steel plates. Background Art

[0002] Conventionally, a technique has been proposed for forming a heat-generating component with self-propagating heat for bonding different components to each other by utilizing a compound generation reaction that generates heat in response to external stimulation (for example, see Patent Document 1).

[0003] [Prior Technical Literature]

[0004] (Patent Document)

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-213026 Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] Self-propagating heat-generating components can instantly reach a reaction temperature of more than 1000 degrees. Therefore, when the heat-generating components are applied to resin-curing adhesives, the base material of the adhesive may deteriorate at high temperatures, causing the bonding strength to decrease. Therefore, when the components are bonded with adhesives and then moved by transportation, they may deviate during transportation, making it difficult to achieve a high-precision bonding position.

[0008] [Technical means to solve the problem]

[0009] (1) The present invention relates to a steel plate joint structure (e.g., steel plate joint structure 1), comprising: a thermosetting adhesive (e.g., adhesive 30), disposed between two steel plates (e.g., two steel plates 2); a heat generating component (e.g., heat generating component 4), disposed in the aforementioned thermosetting adhesive and generating heat in response to external stimulation; and a surrounding component (e.g., surrounding component 5), having a lower thermal conductivity than the aforementioned heat generating component and surrounding at least a portion of the aforementioned heat generating component.

[0010] (2) In the steel plate joint structure described in (1) above, the surrounding member preferably includes any one of titanium, manganese, titanium alloy, Hastelloy, Inconel, and stainless steel, or a combination thereof.

[0011] (3) In the steel plate joining structure described in (1) or (2) above, it is preferred that the heat generating member surrounded by the surrounding member has a granular shape, and a plurality of the granular bodies are arranged in the thermosetting adhesive.

[0012] (4) The present invention relates to a steel plate joining structure, which includes: a thermosetting adhesive (for example, adhesive 30A) disposed between two steel plates (for example, two steel plates 2); and a heat generating component (for example, heat generating component 4A) disposed in the aforementioned thermosetting adhesive and generating heat in response to external stimulation; the aforementioned heat generating component is linearly disposed on the adhesive component (for example, adhesive component 3A) to which the aforementioned two steel plates are bonded by means of the aforementioned thermosetting adhesive.

[0013] (5) In the steel plate joining structure described in (4) above, it is preferable that the heat generating member is provided along a direction in which the adhesive member extends.

[0014] (Effects of the Invention)

[0015] According to the above (1), at least a part of the heat generating component is surrounded by a surrounding component having a lower thermal conductivity than the heat generating component, so that the adhesive material can undergo a hardening reaction without causing high temperature degradation of the adhesive material. Therefore, the adhesive material can be hardened after the reaction in a short folding process, so that when the two bonded steel plates are transported, the steel plates can be prevented from shifting, thereby obtaining a product with high precision.

[0016] According to (2) above, the thermal conductivity of titanium, manganese, titanium alloy, Hastelloy, nickel-chromium-iron alloy or stainless steel is lower than that of a heat generating component such as a laminate of aluminum and nickel. Low thermal conductivity makes it difficult for heat to be transferred to the adhesive 30, thereby reducing the peak temperature of the contact surface between the surrounding component and the steel plate.

[0017] According to the above (3), since it is not necessary to supply the granular body of the heat generating component surrounded by the surrounding member and the adhesive separately, the coating step can be simplified.

[0018] According to the above (4), since the heating range of the heat generating component is transmitted in a wide range in a linear manner, it is possible to bond widely even if there are few welding spots. In addition, since there are few welding spots, it is possible to prevent the high-temperature degradation of the adhesive material, so that the adhesive component after bonding can be maintained in a rigidity that can be carried. As a result, when the two bonded steel plates are transported, the bonded steel plates can be prevented from shifting from each other, so that a high-precision product can be obtained.

[0019] According to the above (5), since the heat generation range of the heat generating component is transferred along the direction in which the adhesive component extends, the adhesive component can be bonded with a small number of welding points. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1A It is a diagram showing a state before joining in the steel plate joining structure according to the first embodiment.

[0021] Figure 1BIt is a diagram showing a state after joining in the steel plate joining structure according to the first embodiment.

[0022] Figure 2 This is a graph showing the temperature change of the heat generating component in the adhesive material according to the first embodiment.

[0023] Figure 3 It is a diagram showing a state before joining in the steel plate joining structure according to the second embodiment.

[0024] Figure 4A It is a diagram showing a state before joining in the steel plate joining structure according to the third embodiment.

[0025] Figure 4B It is a diagram showing a state after joining in the steel plate joining structure according to the third embodiment. DETAILED DESCRIPTION

[0026] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Figure 1A and Figure 1B As shown, the steel plate joint structure 1 of the first embodiment includes two steel plates 2, an adhesive member 3, a heat generating member 4, and a surrounding member 5. The steel plate joint structure 1 of the first embodiment is formed by joining thin and flat metal plates by hemming.

[0027] Of the two steel plates 2, the lower steel plate 21 and the upper steel plate 22 are arranged to overlap each other. The steel plate 21 arranged on the lower side is bent so as to cover the steel plate 22 arranged on the upper side of the steel plate 21. The steel plate 21a, the steel plate 22, and the steel plate 21b on the lower side of the steel plate 22 that are bent and overlapped on the steel plate 22 are pressed from above, and a so-called hem press process is performed.

[0028] The bonding component 3 is arranged between the lower steel plate 21 and the upper steel plate 22. The bonding component 3 includes a thermosetting bonding material 30 provided between the two steel plates 2, a heat generating component 4 described later, and a surrounding component 5. The bonding material 30 is not limited to the type of resin as long as it is thermosetting and can bond the two steel plates 2. For example, it may be epoxy resin or the like.

[0029] The heat generating component 4 is a laminated body formed by alternately stacking aluminum and nickel, and is a so-called self-propagating heat generating body. The heat generating component 4 has the property of generating heat due to external stimulation such as pressure or electrical stimulation, and propagating the heat to the surroundings. The heat generating component 4 is surrounded and clamped by the adhesive 30, and is arranged inside the adhesive 30 in a manner that does not directly contact the steel plate 2.

[0030] The surrounding component 5 is a film-like component that surrounds at least a portion of the heat generating component 4 and is in direct contact with the adhesive material 30. The surrounding component 5 has a lower thermal conductivity than the heat generating component 4. Since the heat conductivity is low, it is not easy to transfer heat to the adhesive material 30, so the peak temperature of the surface in contact with the adhesive material 30 can be reduced. In addition, the surrounding component 5 preferably has a high heat capacity. High heat capacity will make it difficult to heat up and difficult to cool down, and the heating time will be continuous. The film thickness of the surrounding component 5 is appropriately changed according to the thickness or area of ​​the heat generating component 4.

[0031] Titanium is preferred as the surrounding member 5 because it has a lower thermal conductivity than the heat generating member and a higher heat capacity than nickel. In addition, manganese, titanium alloy, Hastelloy, nickel-chromium-iron alloy, stainless steel, etc. have a preferred low thermal conductivity. The surrounding member 5 may also be any one of titanium, manganese, titanium alloy, Hastelloy, nickel-chromium-iron alloy, stainless steel, or a combination of metals selected therefrom.

[0032] The component obtained by surrounding the heat generating component 4, which is a laminated body formed by alternately stacking metals, with the surrounding component 5 is composed of, for example, a continuous body 45 arranged along a metal plate processed into a long strip. The continuous body 45 makes the self-propagating heat generation range wide, thereby obtaining a reliable thermal response.

[0033] like Figure 1A and Figure 1B As shown, when pressure is applied to the overlapping steel plates 21 and 22 in the pressurization step of the folding process to stimulate them, the heat generating component 4, which is a self-propagating heat generating body, generates heat due to the stimulation. At this time, since the heat generating component 4 is surrounded by the surrounding component 5, the heat of the heat generating component 4 is not easily transferred to the adhesive 30, so that the peak temperature of the surface of the surrounding component 5 can be reduced. Figure 2 3 is a diagram for explaining the difference in temperature rise between the adhesive material 30 of this embodiment and an adhesive material without a heat generating component and a surrounding component. Figure 2 As shown, in this embodiment, the temperature of the interface T between the adhesive material 30 and the surrounding component 5 rises to about 200 degrees. In addition, when the surrounding component 5 is made of titanium, the heat capacity is high and the heating time is long, and the heating time lasts for 3 seconds to 5 seconds. For example, when the heat generating component is arranged inside the adhesive material without being surrounded by the surrounding component and pressurized, the rising temperature of the heat generating component rises to nearly 1000 degrees. Even if the temperature rise time is about one second, the adhesive material not surrounded by the surrounding component will deteriorate due to the high temperature.

[0034] If it is a thermosetting resin, when it exceeds 80 degrees, the strength will drop to less than half of the room temperature strength. In the adhesive material 30 of the first embodiment, since the heat-generating component 4 is surrounded by the surrounding component 5, the peak temperature of the contact surface between the adhesive material 30 and the surrounding component 5 is easy to drop. As a result, the steel plates 21 and 22 themselves help to lower the temperature of the adhesive material 30, and the adhesive material 30 hardens and becomes a strength that can be carried. If it is an adhesive component in which the heat-generating component is not surrounded by the surrounding component, the surface temperature of the steel plates 21 and 22 will also rise together with the adhesive material, and it will take time to reach a strength that can be carried. As a result, the adhesive material deteriorates and the strength of the adhesive component decreases, sometimes causing deviation during transportation.

[0035] According to this embodiment, the following effects are achieved.

[0036] (1) The steel plate joint structure 1 is constructed to include: a thermosetting adhesive 30, which is arranged between two steel plates 2; a heat generating component 4, which is arranged in the thermosetting adhesive 30 and generates heat in response to external stimulation; and a surrounding component 5, which has a lower thermal conductivity than the heat generating component 4 and surrounds at least a portion of the heat generating component 4. Since the heat generating component 4 is surrounded by the surrounding component 5, which has a lower thermal conductivity than the heat generating component 4, the hardening reaction of the adhesive 30 can occur without causing high-temperature degradation of the adhesive 30. Therefore, the adhesive 30 can be hardened after reaction in a short folding process, so that when the two bonded steel plates 2 are transported, the steel plates 21 and 22 can be prevented from shifting, thereby obtaining a high-precision product.

[0037] (2) According to the present embodiment, the surrounding component is formed by titanium selected from any one of titanium, manganese, titanium alloy, Hastelloy, nickel-chromium-iron alloy or stainless steel, or a combination thereof. The thermal conductivity of titanium is lower than that of the heat generating component 4 which is a laminate of aluminum and nickel, and the heat capacity is higher than that of aluminum. The low thermal conductivity makes it difficult for heat to be transferred to the adhesive 30, thereby reducing the peak temperature of the contact surface between the surrounding component 5 and the steel plates 21, 22. In addition, the high heat capacity makes the surrounding component 5 difficult to heat up and difficult to cool down, and the heating time of the heat generating component 4 will be prolonged.

[0038] In addition, the present invention is not limited to the above-mentioned embodiment, and modifications and improvements within the scope of achieving the purpose of the present invention are included in the present invention. In the above-mentioned first embodiment, as the heat generating component 4, a component formed by stacking aluminum and nickel in layers is used as an example, but the shape of the heat generating component and the surrounding component is not limited to this. Figure 3 As shown in the second embodiment, the heat generating component 4A surrounded by the surrounding component 5A is a granular body 46 having a granular shape. The particle size of the granular body 46 formed by the heat generating component 4A surrounded by the surrounding component 5A is, for example, about 0.5 mm. Figure 3As shown, the granular body 46 may be mixed into the adhesive 30A before the hemming process. The granular body 46 is mixed into the adhesive 30A and put into the dispenser 6 of the adhesive 30A, and is applied to the steel plate 21 together with the adhesive 30A by the dispenser 6. Thus, a plurality of granular bodies 46 are arranged in the adhesive 30A.

[0039] (3) According to the second embodiment, since it is not necessary to supply the granular bodies 46 of the heat generating component 4A surrounded by the surrounding member 5A separately from the adhesive 30A, the coating process can be simplified.

[0040] exist Figure 4A and Figure 4B In the following, a steel plate joint structure 1B according to a third embodiment is described. In the third embodiment, the heat generating component 4B is not surrounded by the surrounding component.

[0041] like Figure 4A and Figure 4B As shown, in the third embodiment, two steel plates 21, 22 are overlapped up and down, and are clamped by clamps or dies to be pressurized and fixed. The two steel plates 2 are formed by making the lower steel plate 21 and the upper steel plate 22 fit together at the joint edge 23, and bending the two steel plates 21 in a direction away from the joint edge 23. That is, the two steel plates 2 are formed to have a joint edge 23, a first portion 211, 221 extending substantially parallel to the joint edge 23, and a second portion 212, 222 connecting the end of the first portion 211, 221 and the joint edge 23.

[0042] The adhesive component 3B is arranged at the end of the steel plate 2 so as to extend in the long side direction along the joint edge 23 of the steel plate 2. The adhesive component 3B is arranged between the joint edges 23 of the two steel plates 2. The adhesive component 3B has an adhesive material 30B and a heat generating component 4B. The adhesive material 30B is a substantially rectangular parallelepiped that can be placed on the joint edge 23 and has a long strip shape.

[0043] The heating component 4B is a self-propagating heating element similar to the first and second embodiments. The heating component 4B is arranged inside the adhesive material 30B and is arranged linearly along the extending direction of the adhesive component 30B. Specifically, the heating component 4B is arranged along the long side direction of the joint edge 23 and is spaced apart in the short side direction. The heating component 4B can also be arranged in a manner such that the line spacing / line thickness>1.

[0044] like Figure 4A and Figure 4BAs shown, when a stimulus such as pressure or electricity is applied to the joint edge 23, the heating range of the heating component 4 is extended linearly along the heating component 4B. Since the heating component 4B is a self-propagating heating element, the propagation of the heating reaction is widely transmitted due to a local stimulus. Therefore, the heating component 4B can ensure the area of ​​the steel plates 21 and 22 as the adherends, and at the same time, the adhesive 30B can instantly undergo a hardening reaction.

[0045] (4) According to the third embodiment, it includes: a thermosetting adhesive 30B, which is arranged between two steel plates 21 and 22; and a heating component 4B, which is arranged in the thermosetting adhesive 30B and generates heat when receiving external stimulation; the heating component 4B is linearly arranged on the adhesive component 3B to which the two steel plates 21 and 22 are bonded by the thermosetting adhesive 30B. Since the heating range of the heating component 4B is transmitted linearly over a wide range, it can be widely bonded even if there are few welding points. In addition, since there are few welding points, it is possible to prevent the high-temperature degradation of the adhesive material, so that the adhesive component 3B after bonding can be maintained in a rigidity that can be carried. Therefore, when the two bonded steel plates 2 are transported, it is possible to prevent the bonded steel plates 21 and 22 from shifting from each other, so that a high-precision product can be obtained.

[0046] (5) According to the third embodiment, the heat generating component 4B is disposed along the extending direction of the adhesive component 3B. Thus, the heat generation range of the heat generating component 4B is transmitted along the extending direction of the adhesive component 3B, so the entire adhesive component 3B can be bonded with fewer welding points.

[0047] In the third embodiment, the heat generating component 4A may be surrounded by the surrounding member 5 as in the first and second embodiments.

[0048] In addition, the arrangement order of the adhesive material, the heat generating component and the surrounding component is not particularly limited. As shown in the second embodiment, the heat generating component and the surrounding component may be mixed in the adhesive material in advance, or the heat generating component and the surrounding component may be applied at the same time as the adhesive material is applied. Alternatively, the adhesive material may be applied after the heat generating component and the surrounding component are applied in advance.

[0049] Reference numerals

[0050] 1. Joint structure of steel plates

[0051] 2 Two steel plates

[0052] 3.3A, 3B Bonding parts

[0053] 4, 4A, 4B heating components

[0054] 5.5A Enclosure components

[0055] 30, 30A, 30B Adhesive (thermosetting adhesive)

Claims

1. A steel plate joint structure, comprising: Thermosetting adhesive material, set between two steel plates; The heating component is disposed in the aforementioned thermosetting adhesive material and generates heat when receiving external stimulation; and, The surrounding member has lower thermal conductivity than the heat generating member and surrounds at least a portion of the heat generating member.

2. The steel plate joint structure according to claim 1, wherein: The surrounding member includes any one of titanium, manganese, titanium alloy, Hastelloy, nickel-chromium-iron alloy or stainless steel, or a combination thereof.

3. The steel plate joint structure according to claim 1 or 2, wherein: The heat generating component surrounded by the surrounding component has a granular shape, and a plurality of the granular bodies are arranged in the thermosetting adhesive.

4. A steel plate joint structure, comprising: Thermosetting adhesive material, set between two steel plates; and, The heating component is disposed in the aforementioned thermosetting adhesive material and generates heat when receiving external stimulation; The heat generating member is linearly provided on the bonding member on which the two steel plates are bonded by the thermosetting bonding material.

5. The steel plate joint structure according to claim 4, wherein: The heat generating component is arranged along the extending direction of the bonding component.

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