JP2005088077A - Joined structure for metal plate and joining apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joined structure for metal plates in which the joining strength such as the strength to the mutual rotation and deviation between metal plates can significantly be improved and the deformation such as the distortion of the metal plates caused by the joining can be reduced by a simple and inexpensive method even between the metal plates constituting a structural body to be applied with the vibration and the large load or a structural body having comparatively large weight. <P>SOLUTION: In the joined structure for metal plates, a plurality of metal plates are joined with drive rivets, and recessed and projecting parts caving in one surface of the front surface or the back surface and bulging in another surface thereof are formed by plastic-deformation of the plurality of metal plates in the vicinity of the surroundings of the joined part joined by the drive rivets. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a bonding structure and a bonding apparatus that can greatly improve the bonding strength in plate material bonding by driving rivets.

Conventionally, as a technique for improving the bonding strength in plate material bonding by driving rivets, for example, a technique for making the front end portion of the rivet hollow shaft portion non-uniform (see Patent Document 1) is disclosed.
According to the technique disclosed in Patent Document 1, it is possible to increase the resistance to the rotation of the plate material at the joint.

Further, as a technique related to plate material joining by other driving rivets, when joining the first member and the second member, the deformation of the first member and the second member by welding is performed by using the first member by self-piercing rivet joining. And a technique for canceling the deformation of the second member is disclosed (see Patent Document 2).
According to the technique disclosed in Patent Document 2, it is possible to suppress the amount of deformation of the plate material and to obtain an effect that a structure bonded with high accuracy can be provided.

However, the above-described prior art has the following problems.
According to the disclosed technique of Patent Document 1, although the resistance force against the rotation of the member to be joined can be increased to some extent, the plate members constituting the structure subjected to vibration or a large load or the structure having a relatively heavy weight are bonded to each other. In the case of joining using rivets, even if peeling strength is sufficiently obtained, it cannot be said that the joining strength and reliability with respect to rotation and displacement between plate members are sufficient. Therefore, in such a case, it is necessary to use a plurality of rivets, which increases the cost required for the rivet and further increases the cycle time required for joining, resulting in an increase in the cost of joining work. .

  On the other hand, according to the technology disclosed in Patent Document 2, the joint strength can be increased by using both the welding joint and the self-piercing rivet joint. However, since two kinds of joints need to be performed, the cycle time required for the joint is reduced. At the same time, the cost required for joining was high. Furthermore, when surface treatment such as plating or painting is applied to the member to be joined, it is necessary to repair the welded portion after welding. Further, when the member to be joined is made of a combination of resin and metal, there are restrictions on the member to be joined, such as difficulty in welding joining.

JP 2001-304214 A Japanese Patent Laid-Open No. 2002-126872

  The present invention has been made in view of the above-described problems of the prior art, and is simple and low-cost even between plate members constituting a structure subjected to vibration or a large load or a structure having a relatively heavy weight. By the method, it is possible to greatly improve the bonding strength such as the strength against rotation and displacement between the plate materials, and further provide a plate material bonding structure and a bonding apparatus capable of suppressing deformation such as distortion of the plate material due to bonding. To do.

According to the first aspect of the present invention, a plurality of plate members are joined by a driving rivet, and either one of the front and back surfaces is recessed and the other surface bulges in the vicinity of the periphery of the joining portion by the driving rivet. The present invention relates to a joining structure of plate members, characterized in that uneven portions are formed by plastic deformation of the plurality of plate members.
The invention according to claim 2 relates to the joining structure of plate members according to claim 1, wherein the uneven portion is formed by pushing the plate material into a recess formed on the surface of a die by punching.
The invention according to claim 3 relates to the joining structure of plate members according to claim 1 or 2, wherein the uneven portion is formed at a plurality of locations.

The invention according to claim 4 is a joining device for joining a plurality of plate members by a driving rivet, a stem for pressing the head of the driving rivet, and a shaft end portion of the rivet provided opposite to the stem. In order to provide a die for expanding the diameter and plastically deform the plurality of plate members in the vicinity of the periphery of the joint portion by the driving rivet so as to form an uneven portion in which one of the front and back surfaces is depressed and the other surface is expanded. The present invention further relates to a joining apparatus characterized by further comprising a punch and a die.
The invention according to claim 5 eliminates a gap between the plate materials by bringing one or the other surface of the plate material into close contact with the die and the die until the deformation of the plate material by the driving rivet and punch is completed. 5. The joining apparatus according to claim 4, further comprising a work presser for the purpose.
The invention according to claim 6 relates to the joining apparatus according to claim 4 or 5, wherein the joining by the driving rivet and the formation of the uneven portion are simultaneously performed.

According to the first aspect of the present invention, a plate material having a high bonding strength such as a strength against rotation and displacement between the plate members constituting a structure subjected to vibration or a large load or a relatively heavy structure. This is a joint structure. Moreover, it is possible to join even a combination of plate materials that are difficult or impossible to weld, such as an aluminum material and an iron material, a resin material and an iron material, or an aluminum material and a resin material, and a high joint strength is obtained.
According to the invention which concerns on Claim 2, the joining structure of a board | plate material with large joining strengths, such as the intensity | strength with respect to the rotation of a board | substrate and rotation and a shift | offset | difference, can be obtained simply and at low cost.
According to the invention which concerns on Claim 3, it becomes the joining structure of the board | plate material from which the joining strength, such as the intensity | strength with respect to the rotation of a board | plate material and a shift | offset | difference, improved further by the uneven | corrugated | grooved part formed in multiple places.

According to the invention according to claim 4, the plate material having high bonding strength such as strength against rotation and displacement between the plate members constituting the structure subjected to vibration or a large load or the structure having a relatively heavy weight. The junction structure can be obtained. In addition, there is no restriction on the material of the plate material, and a plate material bonding structure having high bonding strength can be obtained.
According to the invention which concerns on Claim 5, it becomes possible to suppress deformation, such as distortion of the board | plate material by joining, few.
According to the invention of claim 6, by having the driving rivet driven and the formation of the concavo-convex portion at the same time, it has high bonding strength efficiently without requiring extra bonding time and increasing the cycle time. It is possible to obtain a joining structure of plate materials.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a plate material bonding structure and a bonding apparatus according to the present invention will be described with reference to the drawings.
1A and 1B are views showing a joining structure of plate members according to the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG.
In the joining structure of the illustrated example, two plate members (2) and (3) are joined by a driving rivet (1), and the front surface is depressed and the back surface is swollen near the periphery of the joining portion by the driving rivet (1). The protruding uneven portion (4) is formed. In this specification, the side on which the driving rivet (1) is driven, that is, the side on which the head of the driving rivet is located is referred to as the front surface, and the opposite side, that is, the side on which the shaft portion of the driving rivet is positioned is referred to as the back surface. Called.
In the illustrated example, the number of plate members to be joined is two, but the present invention can also be applied to the case of joining three or more plate members.

The driving rivet (1) has a known structure consisting of a dish-shaped head and a hollow cylindrical shaft, and the tip of the shaft does not penetrate through the lowermost plate (3). The diameter is expanded in the lower plate (3).
Further, a rounded portion is formed at the transition portion from the head portion to the shaft portion, and the head surface is substantially flush with the surface of the uppermost plate member (2) as shown in the figure when driven and fastened. It is one.

The concavo-convex portion (4) is circular in a plan view and a back view, and is formed by integrally plastic deformation of the two plate members (2) (3). Specifically, it is formed by pushing the plate materials (2) and (3) into the recesses formed on the surface of the die by punching.
In the present invention, the number of the concavo-convex portions (4) is not particularly limited, and may be provided at least at one place near the periphery of the joint portion by the driving rivet (1). It is preferable to provide at a location. In addition, when provided at a plurality of locations, as shown in the illustrated example, it is more preferable to provide at a point-symmetrical position with the driving rivet (1) as the center because stable bonding strength can be obtained.

2A and 2B are views showing another example of the joining structure of plate members according to the present invention, in which FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along line AA of FIG.
In the joining structure of this example, two plate members (2) and (3) are joined by the driving rivet (1), and the back surface is depressed near the periphery of the joining portion by the driving rivet (1) and the surface is expanded. A protruding and recessed portion (4) is formed.
In this bonding structure, the concave portion and the convex portion are opposite to the structure shown in FIG. 1, and this point is different from the bonding structure shown in FIG. 1, but the other points are explained in FIG. It has the same structure as.
In this way, by causing the driving direction of the driving rivet (1) and the deformation direction (depression direction) of the concavo-convex portion (4) to be reversed, the occurrence of distortion of the plate materials (2) and (3) at the time of joining is prevented. The effect that it becomes possible is acquired.

FIG. 3 is an external perspective view showing an example of a workpiece to which the joining structure according to the present invention is applied. FIG. 3A is an overall view, and FIG. 3B is a partially enlarged view.
The workpiece in the illustrated example is a combination of four channel steel materials in a quadrilateral shape, and ends thereof are joined by the joining structure according to the present invention (structure shown in FIG. 1). It is joined at a point.
In the corner portion of the workpiece in the illustrated example, the driving rivet (1) is driven from the top to the bottom at the upper joining portion, and the upper surface is depressed at two locations around the joining portion by the driving rivet (1). A concavo-convex portion (4) whose lower surface bulges is formed. Further, at the lower joint location, the driving rivet (1) is driven from the bottom to the top, and at the two locations around the joint location by the driving rivet (1), the concave and convex portions have the lower surface depressed and the upper surface bulged. (4) is formed.

  In the work having the structure as shown in FIG. 3, the combined channel steel materials are easy to rotate with each other only by joining with the driving rivet (1), and it is difficult to obtain a quadrangle whose corners are perpendicular to each other. As described above, by utilizing the joining structure according to the present invention, the rotation of the members is prevented, so that it is possible to surely obtain a quadrangular work that is firmly joined with the corners at right angles.

FIG. 4 is a view showing a bonding apparatus according to the present invention used for obtaining the bonding structure shown in FIG.
The joining device according to the present invention is a joining device for joining a plurality of plate materials by a driving rivet, and is provided so as to face the stem (5) for pressurizing the head of the driving rivet and the stem (5). A die (6) for expanding the diameter of the shaft end of the rivet and a rivet supply device (13) for driving the rivet to the tip position of the stem (5) to supply the rivet are provided. It is the same.

  In addition to the above-described components, the joining apparatus according to the present invention is for forming a concavo-convex portion in which the surface is depressed and the back surface bulges by plastically deforming a plurality of plate members in the vicinity of the periphery of the joint portion by driving rivets. A punch (7) and a die (8) are further provided. FIG. 5 is an enlarged view of the vicinity of the stem and the punch of the joining apparatus according to the present invention, and FIG. 5 is a joint according to the present invention. FIG. 3 is an enlarged view of a die of the apparatus and a vicinity of the die.

The punch (7) is attached to the tip (lower end) of a cylindrical workpiece presser (9) provided around the stem (5). The tip of the work retainer (9) has a flat shape, and a rivet held at the tip of the stem (5) protrudes and emerges from the center hole.
The punch (7) protrudes from the plane of the workpiece presser tip at a position near the periphery of the center hole of the workpiece presser (9), and the tip of the projection is chamfered to gradually reduce the diameter toward the tip. It has a truncated cone shape. By performing such chamfering processing, the plate material to be joined is prevented from being completely sheared, and the plate material and the punch are easily separated after the formation of the uneven portion.
In the illustrated example, the punch (7) is provided at two positions facing each other across the center hole of the work retainer (9), but the position is symmetrical with respect to the center hole of the work retainer (9). Three or more locations may be provided.

  The work retainer (9) has an open upper surface and a two-stage outer diameter composed of a large diameter portion (91) and a small diameter portion (92). The large diameter portion (91) is at the top, The small diameter portions (92) are arranged so as to be located at the lower portions, respectively. The large diameter portion (91) has a large inner diameter and the small diameter portion (92) has a small inner diameter. The small diameter portion (92) has an inner diameter substantially equal to the outer diameter of the stem (5). The inner diameter of the diameter portion (91) is about 3 to 4 times the outer diameter of the stem (5).

The upper part of the stem (5) has its outer peripheral surface fixed and held by a stem holder (10), and the work holder (9) is held by a holding member (11) integrally provided below the stem holder (10). ing.
The holding member (11) is a cylindrical member, and accommodates the work presser (9) in the inside thereof, and the work presser (11a) is formed by an inwardly extending portion (11a) formed inwardly at a lower end portion thereof. 9) holding the lower surface of the stepped portion transitioning to the large diameter portion (91) and the small diameter portion (92).

The length from the upper end portion of the holding member (11) to the upper surface of the inward extension portion (11a) is formed longer than the length of the large diameter portion (91) of the work holder (9). A spring (12) is disposed in the large diameter portion (91) of the work holder (9), and the stem (5) penetrates the spring (12) in the vertical direction.
The upper end of the spring (12) comes into contact with the lower surface of the stem holder (10), and the lower end comes into contact with the upper surface of the step portion where the inner diameter of the work holder (9) shifts from the large diameter portion to the small diameter portion. The work clamp (9) is always urged downward (toward the stem tip).
The work clamp (9) is biased downward by the spring (12), but the lower surface of the stepped portion is held by the inwardly extending portion (11a) of the holding member (11), so that the work presser (9) is lowered by a certain distance or more. There is no. Also, when a force against the urging force of the spring (12) is applied, the work clamp (9) rises as the spring (12) contracts, but its upper end abuts against the lower surface of the stem holder (10). At that point, the climb stops.

The die (8) is provided integrally with a die (6) provided to face the stem (5) so as to increase the diameter of the shaft end of the rivet.
That is, as shown in FIG. 5, the concave portion of the die (6) for expanding the diameter of the shaft end portion of the rivet and the uneven portion where the surface is depressed and the back surface bulges are formed by plastic deformation of a plurality of plate materials. A recess for the die (8) is provided in one block together. However, they may be joined after being formed separately.
The concave portion of the die (8) is provided at two positions in the position facing the punch (7) in the vertical direction and in the position facing the left and right across the concave portion of the die (6). The position and number of the concave portions of the die (8) may be set so as to coincide with the position and number of the punch (7), and are not particularly limited to the illustrated example.
In addition, the chamfering process is applied to the entrance of the concave portion of the die (8), thereby preventing the plate material to be joined from being completely sheared and preventing the plate material and the punch from being formed after the formation of the concavo-convex portion. It becomes easy to separate.

Hereinafter, a bonding method using the bonding apparatus according to the present invention will be described with reference to the drawings.
First, the driving rivet (1) is pressure-fed by air from the rivet supply device (13), and a suction force is generated at the tip of the stem (5) to adsorb the driving rivet (1) to the tip of the stem (see FIG. 5). .
Next, the stem (5) and the work holder (9) are moved forward (down) by moving the stem holder (10) in a state where the plate members (2) and (3) are installed on the die (6) and the die (8). (Including the punch (7)) is advanced toward the plate (2) (3). This forward drive is performed by converting the rotational force of a drive mechanism, such as a servo motor used in a known rivet joining apparatus, with a screw.
When the stem (5) and the work clamp (9) (including the punch (7)) move forward, the punch (7) and the plate (2) first come into contact with each other (see FIG. 7). Since only the urging force (12) acts, at this stage, no irregularities are formed on the plate material.

Next, when the stem (5) is further advanced together with the stem holder (10), the spring (12) is contracted by this forward driving force, and the tip of the driving rivet (1) held at the tip of the stem (5) is replaced with a plate material ( 2) Abuts on the surface of (2) and starts drilling the plate material (see FIG. 8). Even at this stage, since only the urging force of the spring (12) acts on the punch (7), the uneven portion is not formed on the plate material.
When the stem (5) is further advanced together with the stem holder (10), the spring (12) is further contracted, and when the driving rivet (1) perforates the plate material to a predetermined depth (for example, 2 to 3 mm), the stem holder ( The lower surface of 10) contacts the upper surface of the work clamp (9) (see FIG. 9).

When the lower surface of the stem holder (10) contacts the upper surface of the work holder (9), the forward drive force of the stem holder (10) and the stem (5) is directly transmitted to the work holder (9). In this state, by further advancing the stem holder (10) and the stem (5), the driving rivet (1) is caulked between the die (6) and at the same time between the punch (7) and the die (8). Thus, the plate materials (2) and (3) are plastically deformed, and the joining of the plate materials by the driving rivet (1) and the formation of the concavo-convex portion (4) whose surface is depressed and the back surface bulges in the vicinity of the joining portion of the driving rivet are simultaneously performed. Complete (see FIG. 10).
In this way, by driving the driving rivet and forming the concave and convex portions at the same time, no extra joining time is required and the cycle time can be shortened.
When the deformation of the plate materials (2) and (3) by the driving rivet (1) and the punch (7) is completed, the work presser (9) is in a state of pressing the surface of the plate material (2). Therefore, the back surface of the plate material (3) is brought into close contact with the die (6) and the die (8) to prevent a gap between the plate materials (2) and (3), and at the same time, the plate materials (2) and (3). Distortion is also prevented.

  When the positions of the punch (7) and the die (8) are exchanged in the above-described joining apparatus, the joining structure shown in FIG. 2 can be obtained. That is, when the die (8) is provided integrally with the work presser (9) and the punch (7) is provided integrally with the die (6), the driving direction of the driving rivet (1) and the deformation direction of the concavo-convex portion (4) are provided. It becomes possible to obtain a joining structure in which (the depression direction) is reversed. In this case, it is possible to more reliably prevent the occurrence of distortion of the plate materials (2) and (3) during joining.

As the plate material, a material: SPCC, a plate material (2) having a thickness of 1.6 mm, and a material: SPCC, a plate material (3) having a thickness of 1.6 mm, and as the driving rivet (1), the material: carbon steel, A dish head having a shaft diameter of φ5 mm and a total length of 6.2 mm was used.
Further, the punch (7) having a shaft diameter of φ4.5 mm and the protruding length: 3.5 mm is used, and the die (8) having a recess diameter (hole diameter): φ5 mm and a depth: 4.7 mm is used. It was.
The two plate members (2) and (3) are joined by the method shown in FIGS. 7 to 10 described above using the joining apparatus having the above-described dimensions and the construction shown in FIGS. When the driving rivet (1) perforates the plate material by 2.7 mm, the stem holder (10) comes into contact with the work presser (9), and finally the joining structure shown in FIG. 1 can be obtained.

  INDUSTRIAL APPLICABILITY The present invention can be used in a wide range of industrial fields such as automobiles, machines, and architectures in which a plurality of plate materials are driven and joined with rivets.

It is a figure which shows the joining structure of the board | plate material which concerns on this invention, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a). It is a figure which shows another example of the joining structure of the board | plate material which concerns on this invention, Comprising: (a) is a top view, (b) is the sectional view on the AA line of (a). It is an external appearance perspective view which shows an example of the workpiece | work to which the joining structure which concerns on this invention was applied, (a) is a general view, (b) is a partial enlarged view. It is a figure which shows the joining apparatus which concerns on this invention. It is an enlarged view near the stem and punch of the joining device concerning the present invention. It is an enlarged view of a die and a die vicinity of a joining device concerning the present invention. It is a figure explaining 1 process of the joining method using the joining apparatus concerning this invention. It is a figure explaining 1 process of the joining method using the joining apparatus concerning this invention. It is a figure explaining 1 process of the joining method using the joining apparatus concerning this invention. It is a figure explaining 1 process of the joining method using the joining apparatus concerning this invention.

Explanation of symbols

1 Driving rivet 2 Plate material (upper side)
3 Plate material (lower side)
4 Concavity and convexity 5 Stem 6 Die 7 Punch 8 Die 9 Work clamp

Claims (6)

  A plurality of plate materials are joined together by driving rivets, and in the vicinity of the periphery of the joint portion by the driving rivets, the uneven portions where one of the front and back surfaces is depressed and the other surface bulges are the plurality of plate materials. A structure for joining plate members, characterized by being formed by plastic deformation.   2. The plate material joining structure according to claim 1, wherein the uneven portion is formed by pressing the plate material into a concave portion formed on a surface of a die by punching.   The plate material joining structure according to claim 1, wherein the uneven portion is formed at a plurality of locations.   A joining device for joining a plurality of plate materials by driving rivets, comprising a stem that pressurizes the head of the driving rivet, and a die that is provided facing the stem and expands the diameter of the shaft end of the rivet, It further comprises a punch and a die for plastically deforming the plurality of plate members in the vicinity of the periphery of the joint portion by the driving rivet so as to form a concavo-convex portion in which one of the front and back surfaces is depressed and the other surface is bulged. The joining apparatus characterized by comprising.   A workpiece presser is provided for eliminating the gap between the plate materials by bringing one or the other surface of the plate material into close contact with the die and the die until the deformation of the plate material by the driving rivet and punch is completed. The joining apparatus according to claim 4, wherein The joining apparatus according to claim 4 or 5, wherein the joining by the driving rivet and the formation of the uneven portion are simultaneously performed.

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