Rail material with laminated structure

Abstract

To provide a dissimilar material lamination structure rail material which enables secure fixture without causing electric corrosion even if a rail and a portion fixing the rail are formed of dissimilar metals and enables an engagement member for fixing an object to a transport body structure, a cargo chamber, a load-carrying platform, or a container to be engaged with a predetermined position.SOLUTION: A dissimilar material lamination structure rail material has on its front surface a rail structure, which enables an engagement member for fixing an object to a transport body structure 4 to be engaged with a predetermined position, includes a rear surface which can be fixed to a side wall surface or a floor surface of the transport body structure 4, and has a predetermined thickness. The dissimilar material lamination structure rail material has at least one joint surface, in which dissimilar metals are metallurgically joined to be integrated over its entire surface, between the rail structure and the rear surface in a thickness direction.SELECTED DRAWING: Figure 5B

Description

[Technical field]

[0001] The present invention relates to a rail material with a laminated structure of different materials that can engage at a predetermined position an engaging member for fixing an article to a transport structure, a luggage compartment, a luggage platform, or a container. [Background technology]

[0002] Conventionally, when fixing seats, luggage, shelves, etc. to a transport structure, a cargo space or platform of a truck, a container, etc., rails have been used to fasten articles at any position directly or with lashing belts, etc.

[0003] Generally, lightweight materials are desired for the rail components in order to prevent fuel consumption deterioration due to weight increase, and therefore lightweight metals such as aluminum, aluminum alloys, duralumin, etc. are used for the rail components. On the other hand, steel materials are used for transport structures, luggage compartments, containers, etc., which require strength, and it is necessary to fasten (by bolts, etc.) dissimilar metal materials, the rails made of lightweight materials and the steel materials made of strength materials.

[0004] Mechanical fastening such as welding and bolts is used to fasten dissimilar metals together, but welding aluminum and steel materials does not provide a strong connection due to the significant difference in their melting points and the formation of intermetallic compounds. Mechanical fastening also raises concerns about electrolytic corrosion due to contact between dissimilar metals, which can cause significant corrosion of steel materials used in transport structures and containers, accelerating the deterioration of transport structures and containers. Electrolytic corrosion is a phenomenon in which moisture, sand, dust, etc. enter the gap between dissimilar metals, causing the transfer of electric charges and resulting in corrosion. This electrolytic corrosion can be prevented by insulating the dissimilar metals from each other by applying paint, etc. to the surface of the steel material, but semi-permanent insulation between dissimilar metals cannot be expected due to the destruction of the paint film due to tightening during fastening and cracks due to changes in the paint over time.

[0005] The following Patent Document 1 shows a method of fixing an aluminum rail, in which an iron or stainless steel mounting fixture is attached to an iron or stainless steel base frame by welding, and the rail and mounting fixture are fixed with a flat head screw. In this case, there are contact points between the rail and mounting fixture, which are made of different materials, and electrolytic corrosion occurs. Even if the mounting fixture is coated with an insulating paint, if the flat head screw is made of a single material such as aluminum, iron, or stainless steel, the flat head screw itself will come into contact with a different metal, and even if the flat head screw is coated with an insulating paint, the coating is easily destroyed when the screw is tightened, and severe corrosion due to electrolytic corrosion cannot be avoided.

[0006] Furthermore, the following Patent Document 2 discloses a method of fixing rails to both the floor and side walls of the luggage compartment with bolts, but does not disclose the materials of the rails, the bolts that fix the rails, the floor, or the side walls, and does not mention the concern of electrolytic corrosion when dissimilar metals come into contact with each other.

[0007] A lightweight metal rail 60 for fastening articles to a transport structure which has been conventionally used and which is disclosed in Patent Document 2 will now be described with reference to the drawings. The rail 60 is fixed by a plurality of bolts B (not shown) so as to extend along the side wall or floor surface of the cargo compartment of a cargo vehicle such as a passenger car or a truck, or a container. As shown in FIG. 4, the rail 60 is provided along almost its entire longitudinal direction and has a groove 13 formed to engage with a connected member 30 (also called a stud fitting) to which a metal fitting 21 attached to the end of a lashing belt 20, which is a long member for fastening, is connected, and has a plurality of bolt holes 62 arranged at intervals along the longitudinal direction and one end of which opens into a side wall fixing surface 61. The bolt holes 62 are through holes through which the bolts B are inserted. In this embodiment, the other ends of the bolt holes 62 open into the grooves 13. As shown in FIG. 1, the bolt holes 62 are arranged at predetermined intervals in the longitudinal direction of the rail 60. A countersunk portion 62a is provided on the other end of the bolt hole 62, and the head of the bolt B is pressed against the countersunk portion 62a, thereby pressing the side wall fixing surface 61 against the side wall, thereby fixing the rail 60 to the side wall. The bolt B inserted into the bolt hole 62 may be one that screws into the side wall or the floor surface, or may be one that screws into a frame arranged on the back side of the side wall or the floor surface, etc. The groove 13 is the same as a groove of a known rail called, for example, an airline rail (manufactured by Allsafe Co., Ltd., formerly Ancra Japan Co., Ltd., registered trademark), and has an internal space 13a and a bottom surface 13b extending over almost the entire longitudinal direction of the rail 60 as shown in Fig. 4. The groove 13 also has an opening 16 extending over almost the entire longitudinal direction of the rail 60 and connected to the internal space 13a, and the opening 16 has multiple narrow portions 16a and multiple wide portions 16b arranged alternately in the longitudinal direction of the rail 60.

[0008] 2, the narrow portions 16a are formed by flange portions 13c extending from both sides of the groove 13 in the width direction toward the inside of the groove 13 in the width direction, and the surfaces 13d of the flange portions 13c on the inner space 13a side face the bottom surface 13b. The width dimension of the groove 13 at the narrow portions 16a is smaller than the width dimension of the groove 13 at the wide portions 16b. 3, the connected member 30 has an engaging member 31 having one longitudinal end inserted into the internal space 13a of the groove 13, a connected portion 32 such as a ring connected to the other longitudinal end of the engaging member 31 so as to be rotatable about an axis extending in the longitudinal direction of the groove 13, a movement restricting member 33 provided on the outer periphery of the engaging member 31 so as to be movable in the longitudinal direction of the engaging member 31, and a biasing member 34 such as a spring arranged between the connected portion 32 and the movement restricting member 33 on the outer periphery of the engaging member 31. One end of the biasing member 34 abuts against the connected portion 32 in the longitudinal direction of the engaging member 31. A large diameter portion 31a is formed on one end side in the longitudinal direction of the engaging member 31. The movement restricting member 33 is configured to abut against the large diameter portion 31a, and the movement restricting member 33 is biased toward the large diameter portion 31a by a biasing member 34. This prevents the movement restricting member 33 from falling off from the outer periphery side of the engaging member 31. The movement restricting engaging portions 33a are provided on both ends in the longitudinal direction of the groove 13 (rail 60) in the movement restricting member 33. The movement restricting engaging portions 33a protrude from both ends in the longitudinal direction of the movement restricting member 33 toward the one end side of the engaging member 31.

[0009] The large diameter portion 31a has a width dimension (dimension in the width direction of the groove 13) slightly smaller than that of the wide portion 16b, and a width dimension (dimension in the width direction of the groove 13) larger than that of the narrow portion 16a. Therefore, by inserting the large diameter portion 31a of the engaging member 31 from the wide portion 16b into the internal space 13a and moving the engaging member 31 in the longitudinal direction of the groove 13 to position the large diameter portion 31a at a position corresponding to the narrow portion 16a, the large diameter portion 31a comes into contact with the surfaces (pair of engaging portions) 13d of the flange portions 13c on both sides in the width direction of the groove 13 that face the internal space 13a. As a result, the large diameter portion 31a of the engaging member 31 of the connected member 30 engages with the groove 13 of the rail 60 (see FIG. 4). When inserting the large diameter portion 31a into the internal space 13a from the wide portion 16b and moving the engaging member 31 in the longitudinal direction of the groove 13, the worker moves the movement restricting member 33 toward the connected portion 32 against the biasing force of the biasing member 34. This brings the movement restricting engaging portion 33a into a state of being disposed outside the groove 13. On the other hand, when engaging the large diameter portion 31a of the engaging member 31 with the groove 13 of the rail 60 at any narrow portion 16a of the groove 13, the worker allows the biasing member 34 to move the movement restricting member 33 toward the groove 13, so that at least a portion of the movement restricting engaging portion 33a is disposed within the internal space 13a. The movement restricting engagement portion 33a has a width dimension (the width dimension of groove 13) slightly smaller than that of the wide portion 16b, but has a width dimension (the width dimension of groove 13) larger than that of the narrow portion 16a, so that at least a portion of the movement restricting engagement portion 33a is positioned within the internal space 13a, thereby restricting the movement of the connected member 30 in the longitudinal direction of the groove 13.

[0010] 4, metal fittings 21 such as hook members are attached to both ends of the lashing belt 20. In addition, a fastening force adjuster such as a ratchet buckle is provided in the middle portion of the lashing belt 20 (not shown). One or a pair of rails 60 configured as described above are arranged on both sides in the width direction of the luggage compartment, and are fixed to the side walls or floor surface by the bolts B as described above. In this state, as shown in Fig. 4, a pair of connected members 30 are engaged with any position in the longitudinal direction of the groove 13 of the rail 60 as described above, and the metal fittings 21 on both ends of the lashing belt 20 are respectively connected to the connected portions 32 of the pair of connected members 30. In this state, the fastening force of the lashing belt 20 is increased by a fastening force adjuster (not shown) of the lashing belt 20, whereby the cargo F is pressed against the side wall or floor surface and fixed.

[0011] The rail 60 has a width of, for example, several dozen centimeters or several tens of centimeters, and a thickness smaller than that. The lashing points of the rail 60 can have a pitch of, for example, 25.4 mm. Various types of stud fittings can be used, such as with or without rings, single or double, and various types of rails are known, such as with flanges or embedded types.

[0012] However, all of the prior art lightweight metal rails have been used by engaging dissimilar metals with each other using engaging means such as bolts. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] JP 2008-201208 A [Patent Document 2] JP 2019-43314 A Summary of the Invention [Problem to be solved by the invention]

[0014] In view of the current conventional situation described above, the problem that the present invention aims to solve is to provide a dissimilar material laminated structure rail material that can be firmly fixed without causing electrolytic corrosion when the rail material and the material of the part to which the rail is fixed are dissimilar metals, and that can engage with an engaging member for fixing an article to a transport structure, cargo space, loading platform, or container at a predetermined position. [Means for solving the problem]

[0015] As a result of intensive research and repeated experiments to solve the above-mentioned problems, the inventors discovered that by providing a joint surface in the thickness direction of a rail material which has a rail structure on its surface and a back surface which can be fixed to a side wall surface or floor surface of a transportation structure, in which dissimilar metals are metallurgically joined and integrated over the entire joint surface, it is possible to firmly fix objects without causing electrolytic corrosion, and have completed the present invention.

[0016] That is, the present invention is as follows. [1] A dissimilar laminated rail material having a predetermined thickness and having a rail structure on its surface that can engage with an engaging member at a predetermined position for fixing an article to a transport structure, and a back surface that can be fixed to a side wall surface or floor surface of the transport structure, wherein the dissimilar laminated rail material has at least one joint surface between the rail structure and the back surface in the thickness direction, where dissimilar metals are metallurgically bonded and integrated over the entire joint surface. [2] The rail structure on the surface is formed within a first metal layer, and the back surface is a fixed surface on the transport structure side of a second metal layer of a different type from the first metal layer, and the entire joint surface where the first metal layer and the second metal layer contact is metallurgically bonded to form an integral structure. [3] The dissimilar material laminated structure rail material described in [2], wherein the second metal layer is fixed to the side wall surface or floor surface of the transport structure by welding at the fixed surface on the transport structure side. [4] A dissimilar material laminated structure rail material as described in [1] above, in which the rail structure on the surface is formed within a first metal layer, and the back surface is a fixed surface of a second metal layer of a different type from the first metal layer to the transport structure side, and the first metal layer is fixed to a first intermediate metal layer of the same type as the first metal layer on the surface opposite to the surface on which the rail structure is located, and the first intermediate metal layer and the second metal layer are metallurgically bonded over the entire joint surface where they contact to form an integral structure. [5] The dissimilar material laminated structure rail material described in [4], wherein the first metal layer is fixed to the first intermediate metal layer on the surface opposite the surface on which the rail structure is located by welding. [6] A dissimilar material laminated structure rail material as described in [4] or [5], wherein the second metal layer is fixed to the side wall surface or floor surface of the transport structure at the fixed surface on the transport structure side by welding. [7] A dissimilar material laminated structure rail material as described in [1] above, in which the rail structure on the surface is formed within a first metal layer, and the back surface is a fixed surface of a second metal layer of a different type from the first metal layer to the transportation structure side, and the first metal layer is fixed to a first intermediate metal layer of the same type as the first metal layer on the side opposite to the surface on which the rail structure is located, and the first intermediate metal layer is metallurgically bonded to a second intermediate metal layer on the side opposite to the first metal layer, and the second intermediate metal layer is metallurgically bonded to the second metal layer on the side opposite to the first intermediate metal layer, each over the entire joint surface to form an integral structure. [8] The dissimilar material laminated structure rail material described in [7], wherein the first metal layer is fixed to the first intermediate metal layer on the surface opposite to the surface on which the rail structure is located by welding. [9] A dissimilar material laminated structure rail material as described in [7] or [8], wherein the second metal layer is fixed to the side wall surface or floor surface of the transport structure at the fixed surface on the transport structure side by welding.

[10] The rail material of a laminated structure of different materials described in any one of [1] to [9], wherein the first metal layer is a metal layer selected from the group consisting of pure aluminum, an aluminum alloy, pure titanium, a titanium alloy, and a magnesium alloy.

[11] The rail material of a laminated structure of different materials described in any one of [1] to

[10] above, wherein the second metal layer is a metal layer selected from the group consisting of carbon steel and stainless steel.

[12] A dissimilar laminate structure rail material described in any of [1] to

[11] , wherein the first intermediate metal layer and / or the second intermediate metal layer is a metal layer selected from the group consisting of pure titanium, a titanium alloy, pure aluminum, an aluminum alloy, pure nickel, and a nickel alloy.

[13] A dissimilar laminated structure rail material as described in any of [1] to

[12] , wherein the joint surface between the first metal layer and the second metal layer, the joint surface between the first intermediate metal layer and the second metal layer, the joint surface between the first intermediate metal layer and the second intermediate metal layer, and the joint surface between the second intermediate metal layer and the second metal layer, which are metallurgically bonded over the entire surface of the joint surface to form an integral structure, are each formed by explosive bonding. Effect of the Invention

[0017] The dissimilar material laminated rail material of the present invention prevents electrochemical corrosion caused by contact between the rail and the materials of the transport structure, loading platform, container, etc., which are made of dissimilar metal materials, and also firmly joins dissimilar metal materials together, making it easier to fix the rail. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a view of a prior art metal rail from the groove side. [Diagram 2] 2 is a cross-sectional view taken along line XI-XI in FIG. 1. [Diagram 3] FIG. 1 is a front view of a connected member engaging with a metal rail of the prior art; [Figure 4] FIG. 1 is a perspective view of a metal rail, a connected member, and a metal fitting according to the prior art. [Figure 5(A)] 1 is a schematic diagram of a rail material with a laminated structure made of different materials according to one embodiment of the present invention. FIG. [Figure 5(B)] FIG. 4 is a schematic diagram of a rail material with a laminated structure made of different materials according to another embodiment of the present invention. [Figure 5(C)]FIG. 4 is a schematic diagram of a rail material with a laminated structure made of different materials according to another embodiment of the present invention. [Figure 6] FIG. 2 is a diagram showing a state in which a rail material with a laminated structure of different materials according to an embodiment is fixed to a cargo space of a container. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described in detail. The present invention relates to a dissimilar material laminated structure rail material of a predetermined thickness, which has a rail structure on its surface that can engage with an engaging member at a predetermined position for fixing an article to a transport structure, and a back surface that can be fixed to a side wall surface or floor surface of the transport structure, and which has a joint surface between the rail structure and the back surface in the thickness direction, in which dissimilar metals are metallurgically bonded and integrated over the entire joint surface. One embodiment of the present invention is a rail material with a laminated structure of different materials, in which the rail structure on the surface is formed in a first metal layer, and the back surface is a fixed surface on the transport structure side of a second metal layer that is different from the first metal layer, and the entire joint surface where the first metal layer and the second metal layer contact is metallurgically bonded to form an integral structure (see Figure 5(A)). In another embodiment of the present invention, the rail structure on the surface is formed in a first metal layer, the back surface is a surface of a second metal layer of a different type from the first metal layer that is fixed to the transportation structure, the first metal layer is fixed to a first intermediate metal layer of the same type as the first metal layer on the surface opposite to the surface on which the rail structure is located, and the first intermediate metal layer and the second metal layer are metallurgically bonded over the entire surface of the joint surface where they contact to form an integral structure, which is a dissimilar material laminated structure rail material (see FIG. 5(B)). Yet another embodiment of the present invention is a dissimilar material laminated structure rail material in which the rail structure on the surface is formed within a first metal layer, and the back surface is a fixed surface of a second metal layer of a different type from the first metal layer, which is fixed to the transportation structure side, and the first metal layer is fixed to a first intermediate metal layer of the same type as the first metal layer on the side opposite the surface on which the rail structure is located, and the first intermediate metal layer is metallurgically bonded to a second intermediate metal layer on the side opposite the first metal layer, and the second intermediate metal layer is metallurgically bonded to the second metal layer on the side opposite the first intermediate metal layer, each over the entire joining surfaces to form an integral structure (see Figure 5(C)). Incidentally, the second intermediate metal layer further includes a third intermediate metal layer, a fourth intermediate metal layer, etc., and embodiments having a similar relationship are also included within the scope of the present invention.

[0020] In this specification, "dissimilar metals" refers to a relationship in which the main metal component of one metal or alloy is different from the main metal component of the other metal or alloy. For example, pure aluminum and an aluminum alloy are the same metal because they both have aluminum as the main metal component, while they are dissimilar metals to carbon steel and stainless steel, both of which have iron as the main metal component. For example, an aluminum alloy and pure titanium and carbon steel are also dissimilar metals to each other. The rail material of the present invention has a laminated structure with different materials, characterized in that it has at least one joint surface in the thickness direction where dissimilar metals are metallurgically joined and integrated over the entire joint surface. Furthermore, if the metals used are the same, no electrolytic corrosion will occur even if they are joined by welding or bolting.

[0021] 5(A), an embodiment of 1 is a dissimilar laminated structure rail material composed of a first metal layer 1 having a rail structure on its surface and a second metal layer 2 on its back surface, the second metal layer 2 being of a different material from the first metal layer, and metallurgically bonded over the entire surface where 1 and 2 come into contact, and can be fixed by welding 3 to the side wall or floor of a transport structure, loading platform, container, etc., as indicated by 4. Note that welding is preferable as a means for fixing 2 and 4, which are made of the same metal, from the standpoint of strength, but bolting is not excluded as long as electrolytic corrosion does not occur. Another embodiment is a dissimilar material laminated structure rail material in which a first intermediate metal layer 5 and / or a second intermediate metal layer 6 are arranged between a first metal layer 1 having a rail structure on its surface and a second metal layer 2 whose back surface is of a different material than the first metal layer (rail material), as shown in Figures 5(B) and 5(C). In any of the above embodiments, at least one of the bonding surfaces between the first metal layer and the second metal layer, the bonding surface between the first intermediate metal layer and the second metal layer, the bonding surface between the first intermediate metal layer and the second intermediate metal layer, and the bonding surface between the second intermediate metal layer and the second metal layer is metallurgically bonded over the entire surface to form an integral structure. From the viewpoint of strength, such bonding surfaces "metallurgically bonded over the entire surface to form an integral structure" are preferably bonded and formed by explosive bonding.

[0022] The shape of the rail structure of the first metal layer having the rail structure is not particularly limited as long as it is a mechanism that allows a connecting member such as a lashing belt to be fixed at any location. A specific example of the rail structure is a rail structure in which a linear cavity is provided inside the linear first metal layer 1 and round holes into which a connecting member can be inserted are continuously arranged in a row, and for example, it can have the same structure as the known airline rail (manufactured by Allsafe Co., Ltd., formerly Ancra Japan Co., Ltd., registered trademark) described above. In any of the present embodiments, the bolt holes provided in the airline rail of the prior art are not necessary, but the same type of bolts may be used to join the rail to the same type of intermediate metal layer. In this case, the airline rail of the prior art can be used as it is.

[0023] The first metal layer 1 having a rail structure can be made of a metal material selected from the group consisting of pure aluminum, aluminum alloy, for example, duralumin, pure titanium, titanium alloy, and magnesium alloy.

[0024] The second metal layer 2, which is different from the first metal layer 1 having the rail structure, can be made of a metal material selected from the group consisting of carbon steel and stainless steel, and is preferably made of the same or similar metal material as the metal material of the transport structure, loading platform, container, etc. shown in 4. As a result, even if the dissimilar laminated rail material of this embodiment is fixed using bolts, screws, or rivets, the same materials are in contact with each other, making it difficult for corrosion due to electrolytic corrosion to occur and preventing deterioration over time. Furthermore, when welding 3 is used to fix the dissimilar laminated rail material of this embodiment, welding is easy and strong fixation is possible if the same materials are welded together.

[0025] The first intermediate metal layer 5 and / or the second intermediate metal layer 6 are metal materials selected from the group consisting of pure titanium, titanium alloy, pure aluminum, aluminum alloy, magnesium alloy, pure nickel, and nickel alloy, and the first intermediate metal layer 5 for fixing the first metal layer 1 having a rail structure is more preferably made of at least one material selected from the group consisting of pure titanium, titanium alloy, pure aluminum, aluminum alloy, and magnesium alloy, depending on the material of the first metal layer 1. From the viewpoint of contributing to a stronger fixing device, it is more preferable to provide a second intermediate metal layer 6 together with the first intermediate metal layer 5, and to use a metal material selected from the group consisting of pure titanium and pure nickel as the second intermediate metal layer 6. The method of fixing the first metal layer 1 and the first intermediate metal layer 5, which are the same type as each other, is not particularly limited, but welding 3, bolts, screws, rivets, etc. may be used.

[0026] 6 is a view of the rear of the bed of a truck to which the fixing device of this embodiment is attached. By fixing the fixing device of this embodiment to the side wall surface or floor surface of the bed, cargo, seats, etc. can be fixed at any location, and by installing shelves, etc. at any height direction, it becomes possible to effectively utilize the dead space above the bed. The first metal layer 1 having a rail structure does not need to be in contact with the second metal layer 2 or the second intermediate metal layer 5 over the entire surface of the long rail, and can be fixed so that they are in partial contact. The first metal layer 1 having a rail structure does not need to be continuous, and may be arranged linearly with an interval as a short material.

[0027] As described above, at least one of the bonding surfaces between the first metal layer and the second metal layer, the bonding surface between the first intermediate metal layer and the second metal layer, the bonding surface between the first intermediate metal layer and the second intermediate metal layer, and the bonding surface between the second intermediate metal layer and the second metal layer is metallurgically bonded to form an integral structure over the entire surface. The method for forming such a bonding surface "metallurgically bonded to form an integral structure over the entire surface" is not particularly limited, and a diffusion bonding method, a hot isostatic pressing method (HIP), an electromagnetic welding method, an explosive bonding method, etc. are selected. Among them, the explosive bonding method is a metal bonding method that utilizes the large energy of an explosive, and is a method that can firmly bond dissimilar metals to each other. In addition, a unique waveform is observed at the bonding interface by the explosive bonding method, so that a person skilled in the art can determine that the metallurgical bonding over the entire surface is formed by explosive bonding by observing the waveform. Explosive bonding is the preferred joining method when particularly strong joint strength is required due to the load of heavy objects such as cargo shelves or seats. EXAMPLES

[0028] The present invention will now be described in detail with reference to examples. Example 1 A two-layer bonded product of pure aluminum (JIS A1050, plate thickness 12 mm) and general structural rolled steel (JIS SS400, plate thickness 20 mm) was produced by explosive bonding. This bonded product was subjected to ultrasonic testing in accordance with JIS G 0601, and a rod-shaped bonded product was cut out from the position where bonding was confirmed over the entire surface. A rail structure was produced by cutting the pure aluminum strip-shaped product into a rail structure with a linear cavity and a row of round holes into which connecting members can be inserted, as shown in Figure 5(A). The steel side of this rail was welded to an iron container, a shelf was installed, and cargo was loaded. No dissimilar laminated rail came off or the bonded surface peeled off. No electrolytic corrosion was observed even after one year of use. A shear test piece in accordance with JIS G 0601 was produced from the same two-layer bonded product as the dissimilar laminated rail, and a shear test was performed, showing a shear strength of 85 MPa.

[0029] Example 2 A two-layered bonded product of pure aluminum (JIS A1070, plate thickness 3 mm) and general structural rolled steel (JIS SS400, plate thickness 5 mm) was produced by explosive bonding. This bonded product was subjected to ultrasonic testing in accordance with JIS G 0601, and a rod-shaped bonded product was cut out from the position where bonding was confirmed over the entire surface. Separately, a rail structure member with a linear cavity and a continuous row of round holes into which connecting members can be inserted was welded to the plate pure aluminum side of the bonded product cut out as shown in Figure 5 (B) to manufacture a dissimilar material laminated rail material. The steel side of this dissimilar material laminated rail material was fixed to an iron container by welding, a shelf was installed, and cargo was loaded. No dislocation of the dissimilar material laminated rail material or peeling at the bonded surface occurred. Furthermore, no electrolytic corrosion was observed even after one year of use. A two-layered bonded product identical to the dissimilar material laminated rail material was welded to JIS G A shear test piece was prepared according to 0601 and a shear test was performed, which showed a shear strength of 85 MPa.

[0030] Example 3 A three-layered joint consisting of aluminum alloy (JIS A3003, plate thickness 15 mm), pure titanium (JIS TP270, plate thickness 3 mm), and rolled steel for welded structures (JIS SM400B, plate thickness 25 mm) was fabricated by explosive bonding. This joint was subjected to ultrasonic testing in accordance with JIS G 0601, and a rod-shaped joint was cut out from the position where the joint was confirmed over the entire surface. On the other hand, a rail structure member with a linear cavity and a continuous row of round holes into which a connecting member can be inserted was welded to the aluminum alloy side of the jointed product cut out as described above to integrate them, to produce a dissimilar laminated rail material. The steel side of this dissimilar laminated rail material was fixed to an iron container by welding, a shelf was installed, and cargo was loaded. No dislocation of the dissimilar laminated rail material or peeling at the joint surface occurred. In addition, no electrolytic corrosion was observed even after one year of use. Shear test specimens were prepared in accordance with JIS G 0601 from the same three-layer joint as the dissimilar laminated rail material, and shear tests were conducted, showing a shear strength of 117 MPa.

[0031] Comparative Example 1 Fastening holes were drilled in the side wall of an iron container, and a rail made of rectangular aluminum alloy (JIS A2017, duralumin) with a linear cavity and a row of round holes into which connecting members can be inserted was fastened to the side wall of the iron container using stainless steel rivets. After several months of use, rainwater, sand, dust, etc. entered through the holes in the iron container, causing significant corrosion of the iron material of the container side wall at the contact point between the container and the rail, and causing the rail to rattle and come off.

[0032] Comparative Example 2 A stainless steel concave member was welded to the side wall of an iron container, a hole for fastening a rail was drilled in the center of the concave portion of the member, and a rail with a linear cavity and a continuous row of round holes into which a connecting member could be inserted was fastened to the stainless steel concave member with a stainless steel rivet. After one year of use, corrosion occurred on the stainless steel concave member where the stainless steel concave member and the rail met. [Industrial Applicability]

[0033] The dissimilar laminated rail material of the present invention prevents electrolytic corrosion caused by contact between the rail and the materials of the transport structure, loading platform, container, etc., which are made of dissimilar metal materials, and also firmly joins dissimilar metal materials together and makes it easy to fasten the rail.As such, it is a dissimilar laminated rail material that can be used preferably in cases where particularly strong joining strength is required, such as when the rail is subjected to the load of heavy objects such as cargo shelves and seats. [Explanation of symbols]

[0034] 1. First metal layer with rail structure 2 Second metal layer 3. Welding 4 Cargo bed or container parts 5 First intermediate metal layer 6 Second intermediate metal layer 60 Prior Art Airline Rail (registered trademark) 61 Side wall fixed surface (pressure contact surface) 62 Bolt holes 62a Counterbore 13 Groove 13a Interior space 13b Bottom of rail 13c Flange 13d Surface facing the interior space 16 Opening 16a Narrow part 16b Wide section 20 Lashing belt (long member for fastening) 21 Metal fittings 30 Connected members 31 Engagement member 31a Large diameter section 32 Connected part 33 Movement restriction member 33a Movement restriction engagement part 34 Pressing member

Claims

1. A rail material having a laminated structure of different materials and a predetermined thickness, the rail material having a surface with a rail structure capable of engaging an engaging member for fixing an article to a transport structure at a predetermined position, and a back surface capable of being fixed to a side wall surface or floor surface of the transport structure, the rail material having at least one joint surface between the rail structure and the back surface in the thickness direction, in which dissimilar metals are metallurgically bonded and integrated over the entire joint surface, The rail structure on the surface is formed in a first metal layer, the back surface is a surface of a second metal layer of a different type from the first metal layer that is fixed to the transportation structure, the first metal layer is fixed to a first intermediate metal layer of the same type as the first metal layer on the surface opposite to the surface on which the rail structure is located, and the first intermediate metal layer and the second metal layer are metallurgically bonded over the entire joint surface where they contact each other to form an integral structure, and A rail material having a laminated structure of different materials, wherein the first metal layer is fixed to the first intermediate metal layer on the surface opposite to the surface on which the rail structure is located by welding.

2. 2. The rail material of claim 1, wherein the second metal layer is fixed to a side wall surface or a floor surface of the transportation structure by welding at the transportation structure side fixing surface.

3. A dissimilar material laminated structure rail material as described in claim 1 or 2, wherein the first intermediate metal layer is metallurgically bonded to the second intermediate metal layer on the side opposite the first metal layer, and the second intermediate metal layer is metallurgically bonded to the second metal layer on the side opposite the first intermediate metal layer, over the entire joining surface, to form an integral structure.

4. 4. A rail material with a laminated structure of different materials according to claim 1, wherein the first metal layer is a metal layer selected from the group consisting of pure aluminum, an aluminum alloy, pure titanium, a titanium alloy, and a magnesium alloy.

5. 5. The rail material of claim 1, wherein the second metal layer is a metal layer selected from the group consisting of carbon steel and stainless steel.

6. The rail material of any one of claims 1 to 5, wherein the first intermediate metal layer is a metal layer selected from the group consisting of pure titanium, titanium alloy, pure aluminum, aluminum alloy, pure nickel, and nickel alloy.

7. 4. The rail material of claim 3, wherein the second intermediate metal layer is a metal layer selected from the group consisting of pure titanium, a titanium alloy, pure aluminum, an aluminum alloy, pure nickel, and a nickel alloy.

8. The joint surface between the first intermediate metal layer and the second metal layer, which is metallurgically bonded over the entire surface of the joint surface to form an integral structure, is formed by explosive bonding. A dissimilar material laminated structure rail material as described in any one of claims 1 to 7.

9. The dissimilar material laminated structure rail material described in claim 3 or 7, wherein the joint surface between the first intermediate metal layer and the second intermediate metal layer, and the joint surface between the second intermediate metal layer and the second metal layer, which are metallurgically bonded over the entire surface of the joint surface to form an integral structure, are each formed by explosive bonding.

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