JP2023131360A - Method for manufacturing organic matter layer coated metal plate lap joint, and apparatus for manufacturing organic matter layer coated metal plate lap joint - Google Patents

Abstract

To provide a method for manufacturing an organic matter layer coated metal plate lap joint, and an apparatus for manufacturing an organic matter layer coated metal plate lap joint which can suppress deterioration in an organic matter layer than conventional manufacturing method and manufacturing apparatus, when an organic matter layer coated metal plate is friction-welded.SOLUTION: A method for manufacturing an organic matter layer coated metal plate lap joint includes the steps of: fixing a plate set to an anvil; press-fitting a connection member to the plate set; and friction-welding a metal plate contacting the anvil and the tip of a shaft part, wherein a cylindrical sleeve is press-fit to the plate set from an opposite side to the anvil, and thereby the plate set is fixed to the anvil, the connection member is pressed to the plate set through the inside of the sleeve, an organic matter layer is arranged on one or both of the plate set, the organic matter layer is cooled using the sleeve when the organic matter layer contacts the sleeve, and the organic matter layer is cooled using the anvil when the organic matter layer contacts the anvil.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a metal plate lap joint coated with an organic substance layer, and an apparatus for manufacturing a metal plate lap joint coated with an organic substance layer.

Metal plate overlap joints, which are obtained by joining plate sets made up of a plurality of overlapped metal plates, are included in the joints of various mechanical parts. Welding is the most commonly used method for joining metal plates. Examples of welding used to join plate sets include spot welding, arc welding, and laser welding.

However, during welding, the joint is heated to a temperature higher than the melting point of the metal plates. As a result, the mechanical properties of the metal plate may deteriorate at the joint and its surroundings. This phenomenon is remarkable in steel plates, especially high-strength steel plates with a tensile strength of 780 MPa or more.

Also, welding is not suitable for joining dissimilar materials. When dissimilar materials are melted and mixed and then solidified, a large amount of brittle intermetallic compounds are generated in the weld metal. Therefore, it is difficult to ensure joint strength when welding dissimilar materials.

Friction welding has recently attracted attention as another method for joining metal plates. Friction welding is performed by bringing members into contact with each other and applying pressure using frictional heat generated by rotating one or both members or another friction element (raising the temperature near the joint). It refers to pressure welding (JIS Z 3001-2:2018).

Friction welding is sometimes referred to as friction welding. However, normally, during friction welding, melting and solidification of the welded portion does not occur. In friction welding, a new surface that appears when the surface of the base material is removed is heated to a temperature below the melting point by frictional heat, and is activated and pressurized to form a welded part. . Therefore, the friction welded portion usually does not contain weld metal.

Friction welding has conventionally been used to join rod-shaped materials such as pipes in the longitudinal direction. For example, Patent Document 1 describes a friction welding method for a propeller shaft in which a thin-walled pipe and a thick-walled pipe are arranged coaxially, their end faces are brought into contact with each other, and the two end faces are pressed together by the frictional heat generated by relative rotation. A friction welding method for a propeller shaft is disclosed, which is characterized by making the inner diameter of the pipe smaller than the inner diameter of the thick-walled pipe.

However, in recent years, attempts have been made to overlap and join a plurality of metal plates using friction welding using a rivet-like connecting member having a head and a shaft. In this friction welding method, a connecting member having a shaft and a head is press-fitted into a plate assembly until the tip of the shaft comes into contact with a metal plate placed on the outermost surface of the plate assembly. Then, the tip of the shaft portion is frictionally welded to a metal plate placed on the outermost surface of the plate assembly. As a result, the metal plate friction-welded to the tip of the shaft and the head provided at the base end of the shaft sandwich the metal plate penetrated by the shaft, and the plate assembly is mechanically joined. Ru. Lap joining of metal plates by friction welding can be said to be a joining method that combines friction welding and mechanical joining.

When joining metal plates using friction welding, melting and mixing of the metal plates does not occur. Therefore, friction welding can easily join metal plates made of different materials. Furthermore, the heat input due to friction welding is smaller than the heat input due to welding. Therefore, friction welding is less likely to cause thermal deterioration of the joint and its surroundings.

As a joining technique for metal plates using friction welding, for example, Patent Document 2 discloses a method in which at least two flat plates are used, one of which is a support plate having a higher strength than the other supported plate placed above the two flat plates. Welding is performed via a joining element rotated by a rotating feeder section, and the joining element presses the supported plate against the support plate with a collar, and forms a friction welded joint with the support plate via the shaft section. In the apparatus, the rotary feeder part measures the axial force exerted by the rotary feeder part and the respective feed distance to generate a signal indicative of an increase in the pressing force caused by lowering the shaft part of the joining element. a first step of adjusting the feeding operation of the rotary feeder section so as to pass through the supported plate; and a third step of applying an axial force of said joining element to said support plate to complete the friction welding process. A featured apparatus is disclosed.

Japanese Patent Application Publication No. 2004-141933 JP2011-062748A

In recent years, even higher corrosion resistance has been required for metal plate lap joints. In order to improve corrosion resistance, it is preferable to cover the surface of the metal plate lap joint with an organic layer such as a paint film. However, welding is not suitable for joining metal plates whose surfaces are coated with an organic layer, that is, metal plates coated with an organic layer. When welding a metal plate coated with an organic layer, welding defects occur due to the organic layer or gas generated from the organic layer getting mixed into the weld metal. Therefore, it is difficult to ensure joint strength when welding organic layer-coated metal plates. Furthermore, when the organic layer is an insulator, it is difficult to perform resistance welding such as spot welding.

Therefore, the present inventors attempted to join organic layer-coated metal plates by friction welding. As a result, it was confirmed that the organic layer did not interfere with friction welding and that good joint strength could be ensured.

On the other hand, it has been found that when organic layer-coated metal plates are joined by friction welding, the organic layer deteriorates and peels off around the connecting member, as shown in FIG. Corrosion resistance of the metal plate lap joint was impaired at the peeled part of the organic layer. This peeling of the organic layer was likely to occur when bonding was performed multiple times in succession. There have been no reports of deterioration or peeling of the organic layer when organic layer-coated metal plates are joined multiple times in succession by friction welding. The degradation phenomenon is unknown to those skilled in the art. Although there have been reports of friction welding of metal plates having metal plating such as Zn plating instead of an organic layer, deterioration of the plating is not considered a problem here.

In view of the above circumstances, the present invention provides a method for manufacturing an organic layer-coated metal plate lap joint that can suppress deterioration of the organic layer more than conventional methods when friction welding the organic layer-coated metal plates, and an organic layer-coated metal plate. The purpose of the present invention is to provide a manufacturing device for lap joints.

The gist of the invention is as follows.

(1) The method for manufacturing an organic layer-coated metal plate overlap joint according to the first embodiment of the present invention includes the steps of fixing a plate set made up of a plurality of overlapped metal plates to an anvil, a shaft portion, and a connecting member having a head provided at the base end of the shaft is press-fitted into the plate assembly from the opposite side of the anvil until the metal plate in contact with the anvil and the tip of the shaft come into contact. a step of friction welding the metal plate that is in contact with the anvil and the tip of the shaft, and connecting the metal plate through which the shaft has been penetrated by the head; mechanically joining the metal plate, and in the fixing step, the plate assembly is fixed to the anvil by pressing a cylindrical sleeve onto the plate assembly from the opposite side of the anvil. In the press-fitting step, the connecting member is press-fitted into the plate assembly through the inside of the sleeve, an organic layer is disposed on one or both surfaces of the plate assembly, and the organic layer and the sleeve are bonded together. When the organic material layer and the anvil are in contact with each other, the sleeve is used to cool the organic material layer, and when the organic material layer and the anvil are in contact with each other, the anvil is used to cool the organic material layer.
(2) In the method for manufacturing an organic layer-coated metal plate lap joint according to (1) above, when the organic layer and the sleeve are in contact with each other, the sleeve is made of copper or a copper alloy, and/or the sleeve is made of copper or a copper alloy. When the organic layer is in contact with the anvil, the anvil is made of copper or a copper alloy, and/or the anvil is provided with a cooling mechanism using the refrigerant. The organic layer may be cooled by providing the organic layer.
(3) In the method for manufacturing an organic layer-coated metal plate overlap joint according to (1) above, when the organic layer and the sleeve are in contact with each other, the organic layer is cooled by providing the sleeve with a cooling mechanism using a refrigerant. When the organic layer and the anvil are in contact with each other, the anvil may be provided with a cooling mechanism using a refrigerant to cool the organic layer.
(4) In the method for manufacturing an organic layer-coated metal plate overlap joint according to any one of (1) to (3) above, the organic layer and the sleeve may be in contact with each other.
(5) In the method for manufacturing an organic layer-coated metal plate overlap joint described in (4) above, a chamfered portion with an R of 0.1 mm or more may be provided on the inner edge of the end surface of the sleeve that comes into contact with the organic layer.
(6) The method for manufacturing an organic layer-coated metal plate overlap joint according to the second embodiment of the present invention includes the steps of fixing a plate set composed of a plurality of overlapped metal plates to an anvil, a shaft portion, and a connecting member having a head provided at the base end of the shaft portion is press-fitted into the plate assembly from the opposite side of the anvil until the metal plate in contact with the anvil and the tip of the shaft portion come into contact with each other. a step of friction welding the metal plate in contact with the anvil and the tip of the shank, and friction welding the shank to the metal plate through which the shank is penetrated by the head; mechanically joining the metal plate, an organic layer is disposed on at least a surface of the plate set in contact with the anvil, and the anvil is used to cool the organic layer.
(7) In the method for manufacturing an organic layer-coated metal plate lap joint according to (6) above, the anvil is made of copper or a copper alloy, and/or the anvil is provided with a cooling mechanism using a refrigerant. The organic layer may be cooled.
(8) In the method for manufacturing an organic layer-coated metal plate lap joint described in (6) above, the organic layer may be cooled by providing the anvil with a cooling mechanism using a refrigerant.
(9) In the method for manufacturing an organic layer-coated metal plate lap joint according to any one of (1) to (8) above, one or more of the plurality of metal plates may be a steel plate.

(10) An apparatus for manufacturing an organic layer-coated metal plate overlap joint according to a third embodiment of the present invention includes: an anvil configured to fix a plate assembly made up of a plurality of overlapped metal plates; a rotational pressing mechanism that presses a connecting member having a shaft portion and a head provided at a base end of the shaft portion against the plate set from the opposite side of the anvil while rotating the connecting member around the axis of the connecting member; , a cylindrical sleeve that is pressed against the plate assembly from the opposite side of the anvil to fix the plate assembly, the rotating shaft of the rotary pressing mechanism is located inside the sleeve, and the anvil and the One or both of the sleeves have cooling means.
(11) In the apparatus for manufacturing an organic layer-coated metal plate lap joint according to (10) above, the cooling means includes one or both of the anvil and the sleeve, each of which is made of copper or a copper alloy; , one or both of a cooling mechanism using a refrigerant may be provided on one or both of the anvil and the sleeve.
(12) In the apparatus for manufacturing an organic layer-coated metal plate lap joint according to (10) above, the cooling means may be a cooling mechanism using a refrigerant, which is provided in one or both of the anvil and the sleeve. .
(13) In the apparatus for manufacturing an organic layer-coated metal plate lap joint according to any one of (10) to (12) above, the sleeve may cool the organic layer.
(14) In the apparatus for manufacturing an organic layer-coated metal plate overlap joint according to (13) above, the sleeve may have a chamfered portion with an R of 0.1 mm or more on the inner edge of the end surface that contacts the organic layer. .
(15) An apparatus for manufacturing an organic layer-coated metal plate overlap joint according to a fourth embodiment of the present invention includes an anvil configured to fix a plate assembly made of a plurality of overlapped metal plates; a rotational pressing mechanism that presses a connecting member having a shaft portion and a head provided at a base end of the shaft portion against the plate set from the opposite side of the anvil while rotating the connecting member around the axis of the connecting member; , the anvil having cooling means.
(16) In the apparatus for manufacturing an organic layer-coated metal plate lap joint according to (15) above, the cooling means includes the anvil itself made of copper or a copper alloy, and cooling using a refrigerant provided on the anvil. It may be one or both of the mechanisms.
(17) In the apparatus for manufacturing an organic layer-coated metal plate lap joint according to (15) above, the cooling means may be a cooling mechanism using a refrigerant provided in the anvil.

According to the present invention, there is provided a method for manufacturing an organic layer-coated metal plate lap joint that can suppress deterioration of the organic layer more than conventional methods when friction welding the organic layer-coated metal plates, and a manufacturing method for manufacturing the organic layer-coated metal plate lap joint. equipment can be provided.

It is a schematic diagram of the manufacturing method of the organic layer coated metal plate lap joint according to the first embodiment. FIG. 3 is a schematic cross-sectional view of the anvil and sleeve cooling mechanism. It is a schematic diagram of the manufacturing method of the organic material layer coated metal plate lap joint based on 2nd embodiment. FIG. 2 is a schematic diagram of a method for manufacturing an organic layer-coated metal plate lap joint using a conventional metal plate lap joint manufacturing apparatus.

As shown in FIG. 1, the method for manufacturing the organic layer-coated metal plate lap joint according to the first embodiment of the present invention includes the following steps:
(S1) A step of fixing a plate set B composed of a plurality of stacked metal plates B1 and B2 to an anvil 11;
(S2) A connecting member C having a shaft C2 and a head C1 provided at the base end of the shaft C2 is connected from the opposite side of the anvil 11 to the first metal plate B1 in contact with the anvil 11 and the shaft C2. a step of press-fitting into plate assembly B until the tip of
(S3) The first metal plate B1 in contact with the anvil 11 and the tip of the shaft C2 are friction-welded, and the head C1 connects the second metal plate B2, through which the shaft C2 is penetrated, to the shaft C2. a step of mechanically joining the friction welded first metal plate B1;
Equipped with Here, in the fixing process S1, the plate assembly B is fixed to the anvil 11 by pressing the cylindrical sleeve 12 onto the plate assembly B from the opposite side of the anvil 11, and in the press-fitting process S2, the connecting member C is It passes through the inside 122 of the sleeve 12 and presses against the plate assembly B. An organic layer E is disposed on one or both surfaces of the plate assembly B, and when the organic layer E and the sleeve 12 are in contact with each other, the sleeve 12 is used to cool the organic layer E, and the organic layer E and the anvil 11 are cooled. In the case of contact, the organic layer E is cooled using the anvil 11.

The organic layer-coated metal plate stacked joint A obtained by the above method includes a first metal plate B1 disposed on the outermost layer, and one or more second metal plates stacked on the first metal plate B1. A plate set B consisting of a plate set B2, a shaft portion C2 which is perpendicularly friction-welded to the first metal plate B1 and passes through the second metal plate B2, and a second metal plate provided at the base end of the shaft portion C2. a connecting member C having a head C1 that mechanically joins the first metal plate B1 and the second metal plate B2, and one or both surfaces of the plate set B are covered with an organic layer E. .

Hereinafter, the method for manufacturing the organic layer-coated metal plate lap joint according to the first embodiment will be described in detail.

(Fixing process S1)
First, a plate set B composed of a plurality of stacked metal plates is fixed to the anvil 11. Here, an organic layer E is arranged on one or both surfaces of the board set B. As a result, an organic layer-coated metal plate lap joint A whose surface is covered with the organic layer E can be manufactured. The number of metal plates included in plate set B may be two or three or more.

Hereinafter, for convenience, the metal plate disposed on the outermost layer of the plate assembly B and in contact with the anvil 11 will be referred to as a first metal plate B1, and the other metal plates will be referred to as a second metal plate B2. The first metal plate B1 is a metal plate to which the tip of the shaft portion C2 of the connecting member C is friction-welded, and the second metal plate B2 is a metal plate through which the shaft portion C2 of the connecting member C passes. The number of first metal plates B1 is one. The number of second metal plates B2 may be one or two or more.

In the manufacturing method according to the first embodiment, the plate assembly B is fixed to the anvil 11 by the cylindrical sleeve 12. Specifically, the cylindrical sleeve 12 is perpendicularly abutted against the surface of the plate set B on the opposite side of the anvil 11. Then, the sleeve 12 is pressed against the plate assembly B from the opposite side of the anvil 11. Note that a fixing jig other than the sleeve 12 may be used in combination to more firmly fix the plate assembly B and the anvil 11.

(Press-fitting process S2)
The head C1 provided at the base end of the shaft portion C2 is connected to the rotation pressing mechanism 13 of the manufacturing apparatus 1 for the organic layer-coated metal plate overlap joint A. The connection between the head C1 provided at the base end of the shaft portion C2 and the rotary pressing mechanism 13 may be performed in advance before the fixing step S1. The connecting member C is pressed perpendicularly to the plate assembly B from the opposite side of the anvil 11, and the tip of the shaft portion C2 is brought into contact with the plate assembly B.

Subsequently, by pressing the connecting member C while turning it, the shaft portion C2 of the connecting member C is press-fitted into the plate assembly B, and penetrates the metal plate. Since the plate assembly B is fixed to the anvil 11, the connecting member C rotates relative to the plate assembly B during the press-fitting step S2 and subsequent steps. Further, the connecting member C is pressed against the plate assembly B through the inner side 122 of the sleeve 12. Thereby, the sleeve 12 can fix the periphery of the connecting member C with uniform pressing force, thereby stabilizing the joining operation. As mentioned above, in this embodiment, the metal plate to be penetrated is referred to as the second metal plate B2.

The press-fitting step S2 is continued until the tip of the shaft portion C2 of the connecting member C comes into contact with the metal plate in contact with the anvil 11, that is, the first metal plate B1. By making the length of the shaft portion C2 of the connecting member C sufficiently longer than the total thickness of the second metal plate B2, the tip of the shaft portion C2 can be brought into contact with the first metal plate B1. can. Further, in order to facilitate penetration, it is preferable that the tip of the shaft portion C2 of the connecting member C is not flat but pointed. However, the press-fitting step S2 is a step in which the tip of the shaft portion C2 of the connecting member C is passed through the second metal plate B2 and brought into contact with the first metal plate B1, and the means for doing so is not limited. As mentioned above, the connection member C may be pressed while rotating to pass through the second metal plate B2, or a through hole may be provided in the second metal plate B2 in advance and the connection may be made through the through hole. The member C may be pressed without being rotated to penetrate the second metal plate B2.

(Friction welding process S3)
By further rotating and pressing the connecting member C, the contact portion between the tip of the shaft portion C2 and the first metal plate B1 is heated. Further, in the contact portion, the tip of the shaft portion C2 and the outermost surface of the first metal plate B1 are removed, and a new surface is exposed. When the rotation of the connecting member C is stopped, the new surface is immediately cooled by heat removal from the new surface to the surrounding area. Then, the two newly activated surfaces are firmly joined after cooling, and a friction welded portion D is formed.

When the tip of the shaft portion C2 of the connecting member C is friction-welded to the first metal plate B1, the second metal plate B2 connects the first metal plate B1 joined to the tip of the connecting member C and the connecting member C. It is arranged between the head C1 provided at the base end. That is, the head C1 of the connecting member C connects the second metal plate B2 through which the shaft C2 of the connecting member C is passed, to the first metal plate B1 to which the shaft C2 of the connecting member C is frictionally welded. Join mechanically.

Through the above steps, an organic layer-coated metal plate lap joint A having one or both surfaces coated with an organic layer E is obtained. However, as shown in FIG. 4, the present inventors discovered that the organic layer E disposed on the surface may peel off. As a result of the detailed inspection of the peeled portion by the present inventors, the following facts were confirmed.
(1) As shown in FIG. 4, when the sleeve 12 and the organic layer E were in contact with each other, the organic layer E peeled off at the location where the sleeve 12 was pressed.
(2) As shown in FIG. 4, when the anvil 11 and the organic layer E were in contact with each other, the organic layer E peeled off at the location where the connecting member C was pressed.
(3) When friction welding was performed multiple times in a short time using one welding device, the rate of peeling increased as the number of times of friction welding increased.

Until now, the harm caused by frictional heat in friction welding has not been recognized. In resistance welding such as spot welding, the welded part is cooled through the electrode in order to prevent electrode deterioration due to welding heat and to promote solidification of molten metal. However, in friction welding, the connecting member C is updated every time it is joined. Therefore, thermal deterioration of the connecting member C and the surrounding members was not regarded as a problem. Rather, it is considered undesirable to excessively cool the connecting member C in order to facilitate plastic deformation of the connecting member and promote generation of an activated new surface. In the prior art, cooling of the friction welded portion meant cooling after stopping rotational pressing of the connecting member. Furthermore, the adverse effects of frictional heat on surface treatment were not known. In fact, when friction welding was performed in the above-described procedure on a Zn-plated steel plate having a relatively low melting point, no peeling of the Zn plating occurred.

However, the present inventors discovered that the frictional heat generated between the press-fitting step S2 and the friction welding step S3 moves to and accumulates in the sleeve 12 and anvil 11, causing the sleeve 12 and/or anvil 11 to become disconnected from the plate assembly B. It was presumed that the temperature of the contact portion of the organic layer E increased, and this caused the deterioration of the organic layer E.

Therefore, the inventors of the present invention provided a cooling means to the sleeve 12 and the anvil 11, and attempted to cool the organic layer E in contact with the sleeve 12 and/or the anvil 11 during the press-fitting process S2 to the friction welding process S3. As a result, peeling of the organic layer E could be suppressed. Furthermore, even when the organic layer E was cooled using the sleeve 12 and the anvil 11, friction welding was not hindered and good bonding strength could be ensured.

Based on the above knowledge, in the manufacturing method of the organic layer-coated metal plate lap joint A according to the first embodiment, a fixing jig that comes into contact with the organic layer E is used during the press-fitting step S2 to the friction welding step S3. Then, the organic layer E is cooled. Specifically, when the organic layer E and the sleeve 12 are in contact with each other, the sleeve 12 is used to cool the organic layer E, and when the organic layer E and the anvil 11 are in contact with each other, the anvil 11 is used to cool the organic layer E. Cooling.

As described above, the organic layer E may be provided on only one surface of the board set B, or may be provided on both surfaces. Further, when the organic layer E is provided only on one surface of the board set B, the organic layer E may be placed on the anvil 11 side or on the opposite side of the anvil 11. When the organic material layer E is arranged only on the anvil 11 side, the organic material layer E may be cooled using at least the anvil 11. When the organic layer E is disposed only on the sleeve 12 side, at least the sleeve 12 may be used to cool the organic layer E. When the organic layer E is disposed on both the anvil 11 side and the sleeve 12 side, the organic layer E may be cooled using both the anvil 11 and the sleeve 12. Further, when the organic layer E is provided only on one surface of the plate assembly B, both the anvil 11 and the sleeve 12 may be used to cool the organic layer E and the metal plate.

Note that "cooling" means cooling the metal plate to an extent that can suppress the temperature increase due to friction welding. For example, even if the anvil 11 and the sleeve 12 are made of conventional materials, such as steel, some heat transfer from the metal plates to the anvil 11 and the sleeve 12 occurs during friction welding. However, since steel cannot sufficiently suppress the temperature rise due to friction welding, such heat transfer does not correspond to cooling in this embodiment.

The cooling means is not particularly limited. A suitable example of the cooling means is to make the material of the anvil 11 and/or the sleeve 12 a metal with high thermal conductivity. For example, by making the anvil 11 and/or the sleeve 12 made of copper or a copper alloy, heat transfer from the anvil 11 and/or the sleeve 12 to the main body of the apparatus can be promoted and the organic layer E can be cooled. The thermal conductivity of the material of the anvil 11 and/or the sleeve 12 is preferably 220 W/mK or more, more preferably 280 W/mK or more.

Another suitable example of the cooling means is to provide the anvil 11 and/or the sleeve 12 with a cooling mechanism 111, 121 using a refrigerant, as shown in FIG. The anvil 11 and/or the sleeve 12 may be made of copper or a copper alloy, and may be provided with cooling mechanisms 111 and 121 using a refrigerant. In addition, in FIG. 2, the cooling mechanism 121 is described as a device that sprays a refrigerant toward the workbench from the back side of the workbench of the anvil 11. Further, the cooling mechanism 121 is illustrated as a coolant flow path extending from the front side to the back side of the paper. However, it goes without saying that various configurations can be applied to the cooling mechanisms 111 and 121 depending on the purpose. For example, heat conductive materials other than copper and copper alloys, Peltier elements, etc. can also be used as the cooling means.

Furthermore, according to the experimental results of the present inventors, the sleeve 12 caused the organic layer E to peel more frequently than the anvil 11. However, as described above, by cooling the organic layer E using the sleeve 12, peeling can be prevented. Therefore, when the plate assembly B is arranged so that the organic layer E and the sleeve 12 are in contact with each other, the method for manufacturing the organic layer-coated metal plate overlap joint according to the present embodiment exhibits further superiority over the normal manufacturing method. do.

Furthermore, as a result of detailed analysis of the peeled portion of the organic layer E, the present inventors found that warping of the second metal plate B2 in contact with the sleeve 12 may also cause the organic layer E to peel. When passing the shaft portion C2 of the connecting member C through the second metal plate B2, the second metal plate B2 may warp toward the base end of the shaft portion C2. As a result, the inner edge of the end surface of the sleeve 12 that comes into contact with the organic layer E may slightly damage the organic layer E.

Therefore, a chamfered portion 123 with an R of 0.1 mm or more may be provided on the inner edge of the end surface of the sleeve 12 that comes into contact with the organic layer E. This eliminates the possibility that the inner edge of the end surface of the sleeve 12 may damage the organic layer E, and further effectively prevents the organic layer E from peeling off. The chamfered portion 123 preferably has an R of 0.2 mm or more, and even more preferably has an R of 0.3 mm or more. Note that the normal sleeve 12 is manufactured by drilling a hole in a bar-shaped material or the like, and the chamfered portion 123 is not formed on the inner edge of the end surface of such a sleeve 12.

Next, a method for manufacturing an organic layer-coated metal plate lap joint according to a second embodiment of the present invention will be described. As shown in FIG. 3, the method for manufacturing the organic layer-coated metal plate lap joint according to the second embodiment is as follows:
(S1) a step of fixing plate set B composed of a plurality of stacked metal plates to anvil 11;
(S2) Connect the connecting member C having the shaft C2 and the head C1 provided at the base end of the shaft C2 from the opposite side of the anvil 11 to the first metal plate B1 in contact with the anvil 11 and the shaft C2. a step of press-fitting into plate assembly B until the tip contacts with the tip;
(S3) The first metal plate B1 in contact with the anvil 11 and the tip of the shaft C2 are friction-welded, and the head C1 connects the second metal plate B2, through which the shaft C2 is penetrated, to the shaft C2. A process of mechanically joining the friction welded metal plate;
Equipped with Here, an organic layer E is disposed at least on the surface of the plate assembly B in contact with the anvil 11, and the anvil 11 is used to cool the organic layer E. Hereinafter, the manufacturing method according to the second embodiment will be described in detail in comparison with the first embodiment.

The manufacturing method of the organic layer-coated metal plate lap joint according to the second embodiment is basically the same as the manufacturing method according to the first embodiment. However, in the manufacturing method according to the second embodiment, the step of fixing the plate assembly B to the anvil 11 is not particularly limited. Unlike the first embodiment, it is not essential to use the sleeve 12 in the second embodiment. For example, the plate assembly B may be fixed to the anvil 11 using a fixing jig such as a clamp, which is not shown in FIG. If the sleeve 12 is not used, the connecting member C can be pressed and joined to any location on the plate assembly B. Further, in the manufacturing method according to the second embodiment, the organic layer E is arranged at least on the surface of the plate assembly B that is in contact with the anvil 11. Then, the anvil 11 is used to cool the organic layer E disposed on the anvil 11 side.

Furthermore, preferred aspects of the manufacturing method according to the first embodiment can also be applied to the manufacturing method according to the second embodiment. For example, the organic layer E may be cooled by making the anvil 11 made of copper or a copper alloy and/or by providing the anvil 11 with cooling mechanisms 111 and 121 using a refrigerant.

The basic aspects of the manufacturing method according to the first embodiment and the second embodiment have been described above. Next, more preferred embodiments that are commonly applicable to these will be described.

(Preferred example of metal plate)
The type of metal plate is not particularly limited. The materials of the plurality of metal plates included in plate set B may be the same or different. For example, one or more of the plurality of metal plates may be a steel plate. Thereby, the strength of the organic layer-coated metal plate lap joint A can be increased. All of the plurality of metal plates may be made of steel.

Note that the rotational force and pressing force required to penetrate the shaft portion C2 of the connecting member C are larger in a steel plate than in a soft metal plate such as an aluminum plate, and it takes a longer time to penetrate the steel plate. Therefore, when the second metal plate B2 is a steel plate, the temperature of the organic layer E tends to rise, and therefore the organic layer E tends to peel off. However, in the manufacturing method according to the first embodiment and the second embodiment, since the organic layer E is cooled by the anvil 11 and/or the sleeve 12, even if one or more of the plurality of metal plates is a steel plate. Even so, peeling of the organic layer E can be effectively prevented.

Further, before the press-fitting step S2, a hole may be previously provided in the second metal plate B2 through which the shaft portion C2 of the connecting member C is penetrated. This is particularly effective when the second metal plate B2 is made of a hard material such as a steel plate. Thereby, the press-fitting step S2 can be easily performed. Specifically, the shaft portion of the connecting member C can be penetrated in a short time. Furthermore, the shaft portion C2 of the connecting member C can be penetrated without rotating the connecting member C. The shape of the hole provided in the second metal plate B2 is not particularly limited as long as it has a diameter smaller than the diameter of the head C1 of the connecting member C. Unlike bolting, the diameter of the hole provided in the second metal plate B2 may be smaller than the thickness of the shaft portion C2 of the connecting member C. This is because the connecting member C is press-fitted into the plate assembly B.

(Preferred example of organic layer E)
The organic substance layer E is a surface coating layer containing an organic substance, and is used, for example, to improve the corrosion resistance and aesthetic appearance of a metal plate lap joint. An example of the organic material layer E is a coating film containing an organic material as a main component. In order to further improve the characteristics of the organic layer E, the organic layer E may contain an additive made of an inorganic substance or a metal. Another example of the organic material layer E is a coating film using an organic material as a binder. In this case, even if the content of organic matter is small, there is a risk that the organic matter will deteriorate and the organic matter layer will peel off in normal friction welding. Although there is no particular limitation on the organic substance contained in the organic substance layer E, the present invention is more effectively applied to the organic substance layer E that contains an organic substance with a glass transition temperature of 50° C. or lower because it is easily softened by heat and easily peeled off. be done. An intermediate layer such as plating or a chemical conversion film may be further provided between the organic layer E and the metal plate.

As mentioned above, the organic layer E is arranged on one or both surfaces of the board set B. Further, both surfaces of the metal plates included in the plate set B may be covered with the organic layer E, so that the organic layer E may be disposed on the mating surfaces of the metal plates inside the plate set B. An adhesive, a sealer, or the like may be applied to the mating surfaces of the metal plates included in plate set B.

The configuration of the connecting member C, the friction welding conditions, etc. are not particularly limited. In the manufacturing method according to the first embodiment and the second embodiment, peeling of the organic layer E is prevented by cooling the organic layer E using the anvil 11 and/or the sleeve 12. Therefore, the bonding conditions are not particularly limited, and conditions can be appropriately adopted depending on the configuration of the plurality of metal plates that are the materials to be bonded.

Next, an apparatus 1 for manufacturing an organic layer-coated metal plate lap joint according to a third embodiment of the present invention will be described. An apparatus 1 for manufacturing an organic layer-coated metal plate overlap joint according to the third embodiment includes an anvil 11 configured to fix a plate set B composed of a plurality of overlapped metal plates, and a shaft portion C2. , and a rotary pressing mechanism 13 that presses the connecting member C having the head C1 provided at the base end of the shaft portion C2 against the plate set B from the opposite side of the anvil 11 while rotating around the axis of the connecting member C. and a cylindrical sleeve 12 that is pressed against the plate assembly B from the opposite side of the anvil 11 to fix the plate assembly B. 11 and/or the sleeve 12 have cooling means.

The anvil 11 and the cylindrical sleeve 12 fix the plate assembly B. Further, one or both of the anvil 11 and the sleeve 12 has a cooling means capable of cooling the organic layer E provided on the surface of the plate set B. Thereby, peeling of the organic layer E can be prevented. Since the sleeve 12 has a greater risk of peeling off the organic layer E, it is preferable to provide the sleeve 12 with a cooling means.

Although the cooling means is not particularly limited, for example, by making one or both of the anvil 11 and the sleeve 12 made of copper or a copper alloy, these themselves may be used as the cooling means. On the other hand, cooling mechanisms 111 and 121 using a refrigerant provided on one or both of the anvil 11 and the sleeve 12 may be used as the cooling means. Both of these cooling means can also be employed. That is, more preferably, one or both of the anvil 11 and the sleeve 12 are made of copper or a copper alloy, and have cooling mechanisms 111 and 121 using a refrigerant.

The sleeve 12 may have a chamfered portion 123 with an R of 0.1 mm or more on the inner edge of the end surface that contacts the organic layer E. This eliminates the possibility that the inner edge of the end surface of the sleeve 12 may damage the organic layer E, and further effectively prevents the organic layer E from peeling off.

The rotary pressing mechanism 13 rotates the connecting member C, which has a shaft portion C2 and a head portion C1 provided at the base end of the shaft portion C2, from the opposite side of the anvil 11, while rotating the connecting member C around the axis of the plate. Press on group B. Thereby, the connecting member C can be rotated relative to the plate set B, and friction welding can be performed. Note that in order to press-fit the connecting member C into the plate assembly B through the cylindrical sleeve 12, the rotating shaft of the rotary pressing mechanism 13 needs to be disposed inside 122 of the sleeve 12. Further, the rotation pressing mechanism 13 may include a grip portion that can grip and rotate the head portion C1 of the connection member C. On the other hand, if a polygonal hole is provided in the head C1 of the connecting member C, the rotary pressing mechanism 13 may include a polygonal convex portion having a shape corresponding to the polygonal hole in the head C1. . The mechanism for pressing the connecting member C while rotating is not particularly limited, and any known configuration suitable for friction welding may be appropriately employed.

Although the use of the manufacturing apparatus 1 according to the third embodiment is not particularly limited, it is suitable for implementing the manufacturing method according to the first embodiment, for example.

Next, an apparatus 1 for manufacturing an organic layer-coated metal plate lap joint according to a fourth embodiment of the present invention will be described. An apparatus 1 for manufacturing an organic layer-coated metal plate overlap joint according to the fourth embodiment includes an anvil 11 configured to fix a plate set B composed of a plurality of overlapped metal plates, and a shaft portion C2. , and a rotary pressing mechanism 13 that presses the connecting member C having the head C1 provided at the base end of the shaft portion C2 against the plate set B from the opposite side of the anvil 11 while rotating around the axis of the connecting member C. , and the anvil 11 has a cooling means.

The manufacturing apparatus 1 according to the fourth embodiment is basically the same as the manufacturing apparatus 1 according to the third embodiment. However, in the manufacturing apparatus 1 according to the fourth embodiment, the means for fixing the plate set B to the anvil 11 is not particularly limited. Unlike the third embodiment, it is not essential to use the sleeve 12 in the fourth embodiment. For example, the manufacturing apparatus 1 may include a fixing jig such as a clamp for fixing the plate set B to the anvil 11. If the sleeve 12 is not used, the connecting member C can be pressed and joined to any location on the plate assembly B. Furthermore, in the manufacturing apparatus 1 according to the fourth embodiment, the anvil 11 is used to cool the organic layer E disposed on the anvil 11 side. Note that if the manufacturing apparatus 1 according to the fourth embodiment does not include the sleeve 12, there is no possibility that the organic layer E disposed on the opposite side of the anvil 11 will peel off.

Although the use of the manufacturing apparatus 1 according to the fourth embodiment is not particularly limited, it is suitable for implementing the manufacturing method according to the second embodiment, for example.

EXAMPLES The effects of one embodiment of the present invention will be explained in more detail with reference to Examples. However, the conditions in the examples are merely examples of conditions adopted to confirm the feasibility and effects of the present invention. The present invention is not limited to this one example condition. The present invention may adopt various conditions as long as the objectives of the present invention are achieved without departing from the gist of the present invention.

The two steel plates shown below were fixed to an anvil using a sleeve and friction welded to produce various organic layer-coated metal plate overlap joints. When the first metal plate was coated, each cooling method was applied to the anvil overlapping it with an uncoated second metal plate, and peeling of the organic layer of the first metal plate was evaluated. When the second metal plate was coated, the uncoated first metal plate was placed on top of the sleeve, each cooling method was applied to the sleeve, and peeling of the organic layer of the second metal plate was evaluated.

Friction welding was performed at a maximum of 100 points at 30 mm intervals every 10 seconds. After the joining was completed, the surface of the organic layer-coated metal plate overlap joint was visually observed to confirm whether or not the organic layer had peeled off. The evaluation criterion used was the number of times of bonding until the first occurrence of peeling of the coating film.
・The number of times of bonding is 91 or more times before the first peeling of the paint film occurs: ◎
・The number of times of bonding is 21 or more and 90 or less before the first peeling of the paint film occurs: ○
・The number of times of bonding is 6 or more and 20 or less before the first peeling of the paint film occurs: △
・The number of times of bonding before the first occurrence of paint film peeling is 1 to 5 times: ×

The sleeves and anvils were made of four types: steel, copper, steel and with a water cooling mechanism, and copper and with a water cooling mechanism. Further, in some experiments, a chamfered portion with an R of 0.1 mm was provided on the inner edge of the end surface of the sleeve that was in contact with the organic layer.
Table 2 shows the evaluation results for the organic layer in contact with the sleeve. In order to obtain the experimental results shown in Table 2, the anvil was made of steel, the sleeve was made of one of the four types mentioned above, and the plate assembly was bonded using a joining device so that an organic layer was placed on the surface of the plate assembly that was in contact with the sleeve. It was assembled into.
Table 3 shows the evaluation results for the organic layer in contact with the anvil. In order to obtain the experimental results shown in Table 3, the anvil was one of the four types mentioned above, the sleeve was made of steel, and the plate assembly was bonded using a joining device so that an organic layer was placed on the surface of the plate assembly in contact with the anvil. It was assembled into.
The test results when the sleeve was provided with a chamfered portion are shown in Table 2 in parentheses.

In a comparative example in which both the sleeve and anvil were made of steel, peeling occurred very early in both the organic layer on the anvil side and the organic layer on the sleeve side.
When the sleeve was made of steel and the anvil was made of copper or had a water cooling mechanism, peeling was suppressed in the organic layer on the anvil side.
Further, when the anvil was made of steel and the sleeve was made of copper or had a water cooling mechanism, peeling was suppressed in the organic layer on the sleeve side.
Furthermore, by providing a chamfered portion on the sleeve, in some cases it was confirmed that peeling of the organic layer was further suppressed.

1 Manufacturing device 11 Anvil 111 Cooling mechanism 12 Sleeve 121 Cooling mechanism 122 Inside of sleeve 123 Chamfered portion 13 Rotary pressing mechanism A Organic layer coated metal plate overlap joint B Plate assembly B1 First metal plate B2 Second metal plate C Connection member C1 Head C2 Shaft D Friction welding part E Organic layer S1 Fixing process S2 Press-fitting process S3 Friction welding process

Claims (17)

a step of fixing a plate assembly made up of a plurality of stacked metal plates to an anvil;
A connecting member having a shaft and a head provided at the base end of the shaft is connected to the plate assembly from the opposite side of the anvil until the metal plate in contact with the anvil and the tip of the shaft come into contact. a process of press-fitting into the
The metal plate in contact with the anvil and the tip of the shaft are frictionally welded, and the metal plate through which the shaft is penetrated by the head is attached to the metal plate to which the shaft is frictionally welded. a mechanical joining process;
Equipped with
In the fixing step, the plate assembly is fixed to the anvil by pressing a cylindrical sleeve against the plate assembly from the opposite side of the anvil,
In the press-fitting step, the connecting member is press-fitted into the plate assembly through the inside of the sleeve,
An organic layer is arranged on one or both surfaces of the board set,
An organic layer-coated metal plate that uses the sleeve to cool the organic layer when the organic layer and the sleeve are in contact with each other, and cools the organic layer using the anvil when the organic layer and the anvil are in contact with each other. Method of manufacturing lap joints. When the organic layer and the sleeve are in contact with each other, the sleeve is made of copper or a copper alloy, and/or the sleeve is provided with a cooling mechanism using a refrigerant to cool the organic layer,
A claim characterized in that when the organic layer and the anvil are in contact with each other, the anvil is made of copper or a copper alloy, and/or the anvil is provided with a cooling mechanism using a refrigerant to cool the organic layer. Item 1. A method for manufacturing an organic layer-coated metal plate lap joint according to Item 1. When the organic layer and the sleeve are in contact with each other, the sleeve is provided with a cooling mechanism using a refrigerant to cool the organic layer, and when the organic layer and the anvil are in contact with each other, the anvil is provided with a cooling mechanism using a refrigerant. 2. The method for manufacturing an organic layer-coated metal plate lap joint according to claim 1, wherein the organic layer is cooled by a method. The method for manufacturing an organic layer-coated metal plate lap joint according to any one of claims 1 to 3, wherein the organic layer and the sleeve are in contact with each other. 5. The method for manufacturing an organic layer-coated metal plate lap joint according to claim 4, wherein a chamfered portion with an R of 0.1 mm or more is provided on the inner edge of the end surface of the sleeve that comes into contact with the organic layer. a step of fixing a plate assembly made up of a plurality of stacked metal plates to an anvil;
A connecting member having a shaft and a head provided at the base end of the shaft is inserted from the opposite side of the anvil until the metal plate in contact with the anvil and the tip of the shaft come into contact with the plate. A process of press-fitting into the assembly,
The metal plate in contact with the anvil and the tip of the shaft are frictionally welded, and the metal plate through which the shaft is penetrated by the head is attached to the metal plate to which the shaft is frictionally welded. a mechanical joining process;
Equipped with
At least an organic layer is arranged on the surface of the plate set in contact with the anvil,
A method for manufacturing an organic layer-coated metal plate lap joint, in which the organic layer is cooled using the anvil. 7. The organic layer-coated metal plate stack according to claim 6, wherein the organic layer is cooled by making the anvil made of copper or a copper alloy and/or providing the anvil with a cooling mechanism using a refrigerant. How to manufacture fittings. 7. The method for manufacturing an organic layer-coated metal plate lap joint according to claim 6, wherein the organic layer is cooled by providing a cooling mechanism using a refrigerant on the anvil. The method for manufacturing an organic layer-coated metal plate lap joint according to any one of claims 1 to 8, wherein one or more of the plurality of metal plates is a steel plate. an anvil configured to fix a plate set made up of a plurality of stacked metal plates;
a rotational pressing mechanism that presses a connecting member having a shaft portion and a head provided at a base end of the shaft portion against the plate set from the opposite side of the anvil while rotating the connecting member around the axis of the connecting member; ,
a cylindrical sleeve that is pressed against the plate assembly from the opposite side of the anvil and fixes the plate assembly;
Equipped with
The rotating shaft of the rotary pressing mechanism is located inside the sleeve,
one or both of the anvil and the sleeve have cooling means;
Manufacturing equipment for organic layer-coated metal plate lap joints. The cooling means
one or both of the anvil and the sleeve being made of copper or a copper alloy; and
The apparatus for manufacturing an organic layer-coated metal plate lap joint according to claim 10, characterized in that one or both of the anvil and the sleeve are provided with a cooling mechanism using a refrigerant. 11. The apparatus for manufacturing an organic layer-coated metal plate lap joint according to claim 10, wherein the cooling means is a cooling mechanism using a refrigerant provided on one or both of the anvil and the sleeve. The apparatus for manufacturing an organic layer-coated metal plate lap joint according to any one of claims 10 to 12, wherein the sleeve cools the organic layer. 14. The apparatus for manufacturing an organic layer-coated metal plate lap joint according to claim 13, wherein the sleeve has a chamfered portion with an R of 0.1 mm or more on the inner edge of the end surface that contacts the organic layer. an anvil configured to fix a plate set made up of a plurality of stacked metal plates;
a rotational pressing mechanism that presses a connecting member having a shaft portion and a head provided at a base end of the shaft portion against the plate set from the opposite side of the anvil while rotating the connecting member around the axis of the connecting member; ,
Equipped with
An apparatus for producing an organic layer-coated metal plate lap joint, wherein the anvil has a cooling means. The cooling means
16. The production of an organic layer-coated metal plate lap joint according to claim 15, wherein the anvil itself is made of copper or a copper alloy, and one or both of a cooling mechanism using a refrigerant provided on the anvil. Device. 16. The apparatus for manufacturing an organic layer-coated metal plate lap joint according to claim 15, wherein the cooling means is a cooling mechanism using a refrigerant provided on the anvil.

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