JP6689643B2 - Fastening structure and method of assembling fastening structure - Google Patents

Description

  The present invention relates to a fastening structure and a method for assembling a fastening structure, and more particularly to a fastening structure assembled by fastening two or more painted members to be fastened while ensuring electrical continuity, and a method for assembling the fastening structure.

  As a method of assembling or fastening a steel control panel frame or the like, there are welding, screwing, rivet fastening, bonding and the like. Conventionally, assembly by welding has been the mainstream, but since workability is poor, it is currently shifting to another method, and in particular, assembly by rivet fastening has good workability and is being adopted.

  In addition, the steel control panel frame is coated on the surface to maintain the design after assembly (aesthetic appearance of the frame). The coating methods include electrodeposition coating, solvent spray coating, and powder coating. Although coating is used, of these, electrodeposition coating having a high rust preventive power is superior.

  For this reason, in many cases, the method of manufacturing the frame for the control panel is a method of assembling by rivet fastening and applying electrodeposition coating.However, when rivet fastening is performed and electrodeposition pretreatment is performed, electrodeposition coating is performed. The pretreatment solution for electrodeposition may permeate into minute gaps between the members, and may exude during drying, causing a problem that the coating film is colored. In order to correct this defect, there arises a problem that the number of steps and the manufacturing time are increased.

  On the other hand, in order to prevent the occurrence of problems in the above-mentioned electrodeposition coating process, there is also a method of pre-painting the members and then assembling them by rivet fastening, but in this case, in order to prevent the occurrence of noise during product operation , It is necessary to secure the continuity between the painted members and to ground them.

  The following Patent Documents 1 to 3 are techniques for securing the electrical connection between the members fastened by rivets after the members are painted and fastened with rivets. The following Patent Documents 1 to 3 are all techniques for obtaining electrical continuity between the respective members after coating, and are techniques for obtaining electrical continuity by processing a rivet hole or techniques for producing electrical continuity by processing a rivet.

  Patent Document 1 discloses a fixing method in which a plurality of members to be fastened that are coated with a coating film are connected using a blind rivet having a conductive rivet body and are electrically conducted, and one surface is formed. Before the coating of the member to be fastened, a countersink hole into which the rivet body of the blind rivet can be inserted is formed in the first member to be fastened by a punch and a die, and a ridge extending in the radial direction is provided on the slope of the countersink hole. The method is characterized in that: In Patent Document 1, since the slope 10 of the countersink 6 of the first member to be fastened 1 has the ridge 10, the flange 21 contacting the slope 13 of the countersink 6 of the first member to be fastened 1 after coating is formed. It is described that the coating film 19 in the portion of the ridge 10 is broken by being pressed by the ridge 10 with a strong force at the time of fastening and the ridge 10 and the flange 21 can be electrically connected.

  Patent Document 2 discloses a case fastening rivet in which one metal plate provided with a coating film and the other metal plate provided with a coating film are fastened with a round-head rivet, and the round-head rivet has a head portion. Disclosed is a casing fastening rivet, characterized in that a convex portion having an unequal triangular cross-section is provided on a surface of the head portion in contact with the one metal plate. Has been done. According to Patent Document 2, it is described that the coating film 3 can be efficiently peeled off by the convex portion 9e.

  Patent Document 3 discloses a conduction rivet in which two upper and lower metal plates coated with a coating film are inserted into the through holes of both metal plates and fastened to each other, and the metal at least on the lower side of the peripheral surface of the shaft portion. A ridge that breaks the coating film on the plate and contacts the lower metal plate is formed, and a protrusion that breaks the coating film on the upper metal plate and contacts the upper metal plate is formed on the lower surface of the head. A conducting rivet characterized by being formed is disclosed. In Patent Document 3, since a protrusion is formed on the lower surface of the head in addition to the protrusion on the peripheral surface of the shaft, the protrusion of the shaft breaks at least the coating film on the lower metal plate and is formed below. Side metal plate, the projection of the head breaks the coating film of the upper metal plate and contacts the upper metal plate, ensuring continuity between both metal plates via rivets, and the huge rivet is assembled. It is described that it is possible to reduce costs and improve workability by eliminating the need for additional painting equipment and additional work such as connecting a ground wire.

JP, 2009-150478, A JP, 2014-202290, A JP, 2001-27212, A

  The techniques of Patent Documents 1 to 3 described above are provided with a protrusion in each case, although there is a difference between the rivet hole side and the rivet side to be processed, and the rivet is formed by the protrusion breaking through the coating film during rivet fastening. This is a technique for contacting a member with a member to obtain conduction. However, there are some thick films (40 to 100 μm) and hard ones in the coating film, and there is a problem that the coating film cannot be pierced by the pressure at the time of rivet fastening. If the fastening force is increased so as to break through the coating film of the pressure film, the rivet itself may be broken.

  Further, in the case of processing the protrusion on the rivet side as in Patent Documents 2 and 3, it is a dedicated rivet, and there are problems such as an increase in cost as compared with a general-purpose product and an operation error due to a mistake with a normal rivet.

In view of the above circumstances, the present invention can prevent a coating failure after fastening even in a fastened member having a thick coating film and can reliably ensure continuity between fastened members. a method Te assembly of fastening structures and fastening structures.

In order to achieve the above object, the present invention provides a fastening structure having two members to be fastened and a rivet for fastening the two members to be fastened, wherein one of the members to be fastened is on the opposite side from the surface. A first through hole that penetrates from the bottom surface of the recess to the surface on the opposite side, and the other of the members to be fastened has a second through hole; The rivet is inserted into the recess, the first through hole, and the second through hole to fasten the two members to be fastened, and the surface of the recess is a projection provided so as to surround the first through hole. And each of the protrusion and a part of the second through hole are in contact with the rivet, and the two members to be fastened have a portion where the rivet and the protrusion contact, a rivet and a second through hole. Of the part that comes in contact with a part, the rivet, the first through hole and the second through hole Have a coating on a portion other than the portion surrounded by the in portions, the recess, when viewed from above, to provide a fastening structure, which is a polygon.

The present invention also provides a method of two workpieces is Te assembled fastening structure fastened with rivets, as the member to be fastened, and a recess provided towards the surface opposite from the surface, the bottom surface of the recess To a surface on the opposite side, a first member to be fastened having a projection provided on the surface of the recess to surround the first through hole, and a second through hole. state and second workpieces, were prepared, the masking jig is inserted into the recess of the first through-hole of the first workpieces was contacted masking jig projection and the first through-hole Is applied to the first fastened member, the masking jig is removed from the first fastened member, and the first fastened member and the second fastened member are arranged so that the first through hole and the second through hole face each other. The two members to be fastened are combined, and the recess, the first through hole, and the second through hole are provided with Insert the Tsu bets, it provides a method Te assembled fastening structure characterized by fastening the first member to be fastened and second workpieces.

ADVANTAGE OF THE INVENTION According to this invention, even if it is a to-be-fastened member which has a thick film, the fastening structure which can prevent the coating failure after fastening and can ensure the electrical connection between the to-be-fastened members reliably. and it is possible to provide a method Te assembly of the fastening structure.

  Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

It is sectional drawing which shows typically the fastening structure of Example 1 which concerns on this invention. 5A and 5B are a cross-sectional view and a top view schematically showing a first member to be fastened (before coating) according to the first embodiment. The first by inserting a masking jig workpieces 2 is a cross-sectional view painted. An example of the coating film formation of the case without the collision force in the recess of the first member to be fastened is a cross-sectional view schematically showing. An example of formation of the coating film when provided collision caused in the recess of the first member to be fastened is a cross-sectional view schematically showing. It is sectional drawing which shows typically an example of the 1st to-be-fastened member (before coating) of Example 2. 9A and 9B are a cross-sectional view and a top view schematically showing another example of the first member to be fastened (before coating) according to the second embodiment. 9A and 9B are a cross-sectional view and a top view schematically showing an example of a first member to be fastened (before coating) according to a third embodiment. It is a top view which shows typically the 1st to-be-fastened member (before coating) of Example 4. It is a perspective view showing a part of example of a fastening structure (switchboard frame) concerning the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following examples.

FIG. 10 is a perspective view showing a part of an example of the fastening structure (switchboard frame) according to the present invention. In the present invention, the “fastening structure” means a structure in which two or more members to be fastened are fastened by rivets and assembled. An example of the fastening structure according to the present invention is a frame (housing) of a switchboard made of steel or the like. A switchboard frame (hereinafter, referred to as “frame”) 100 illustrated in FIG. 10 includes a frame body 101 serving as a skeleton of the frame 100, a top plate 102 attached to the frame body 101, and a pair of side surface plates 103 (in FIG. 1, Only one of the pair is shown) and the front plate 104. Although not shown in FIG. 1, a floor plate facing the top plate 102 is provided below the frame 100, and a back plate facing the front plate 104 is provided behind the frame 100. The frame 100 has a box shape surrounded by a top plate 102, a pair of side plates 103, a front plate 104, a floor plate and a back plate. The top plate 102, the side plate 103, the front plate 104, the floor plate and the back plate to the frame 101 are fixed by fastening portions (rivets) 106. A coating film is usually formed on the surface of the frame 100.

Next, the fastening portion (rivet) 106 will be described in detail. 1 is a cross-sectional view schematically showing the fastening structure of the first embodiment, and FIG. 2 is a cross-sectional view and a top view schematically showing the first member to be fastened (before coating) of the first embodiment. As shown in FIG. 1, the fastening structure according to the present invention includes a structure in which a first fastened member 1a and a second fastened member 2 are fastened by rivets 3 (disc head rivets). First workpieces 1a is a member serving as a front side of the fastening structure has a first side opposite the recess provided towards the surface (pan hole) from the surface of the fastening member 1a 8a. The first workpieces 1a, the through-hole (lower hole) 10a is provided penetrating from the bottom surface of the dish-holes 8a to the opposite surface. The second member to be fastened 2 is directly connected to the prepared hole 10a of the first member to be fastened 1a and has a through hole 10b penetrating the second member to be fastened 2 in the thickness direction. Dish hole 8a, the first through hole 10a and the second through hole 10b constitutes the rivet hole. The head portion 30 of the rivet 3 is housed in the recess 8a of the first member to be fastened 1a, and the body portion 31 of the rivet 3 is housed in the through hole 10 formed by the prepared hole 10a and the through hole 10b.

As shown in FIGS. 1 and 2, the dish hole 8a of the first workpieces 1a, when viewing the first of the fastening member 1a from the top, the cross-section so as to surround the outer periphery of the circular through-hole 10a A convex protrusion 4a is provided. The protrusion 4a contacts the head 30 of the rivet. Further, the body portion 31 of the rivet and a part of the through hole 10b of the second member to be fastened 2 come into contact with each other . The surfaces of the first member to be fastened 1a and the second member to be fastened 2 are coated with the coating film 13 and the coating film 6, respectively, but the projection 4a is unpainted. Further, a portion where the rivet 3 and the protrusion 4a contact each other, a portion where the rivet 3 contacts a part of the second through hole 10b, another portion of the rivet 3, the first through hole 10a and the second through hole. The portion surrounded by (the portion not in contact with the rivet 3) (the portion surrounded by the dotted line in FIG. 1) does not have a coating film. Therefore, the conduction path 5 shown by the arrow in FIG. 1 is secured, and conduction can be obtained from the fastened member 1a through the rivet 30 to the contact portion between the fastened member 2 and a part of the through hole 10b. The coating film 13 is formed on the first fastened member 1a from the surface to the position where the protrusion 4a and the head portion 30 of the rivet come into contact with each other.

Next, a method of forming the coating film 13 on the first member to be fastened 1a will be described. Figure 3 is a cross-sectional view painted by inserting the masking jig 12 to the first of the fastening member of Fig. 2. As shown in FIG. 3, the masking jig 12 is inserted into the dish-hole 8a and the through hole 10a of the first workpieces 1a before painting, subjected to coating treatment. In this case, as in the case of the rivet 3 described above, a masking jig 12 in contact with the protrusion 4a is also because the edge 14 and the masking jig 12 of the through hole 10a is in contact, the coating film 13, first Is formed between the surface of the fastened member 1a and the protrusion 4a, but is not formed on the protrusion 4a and the portion beyond it. Therefore, the projection 4a that comes into contact with the rivet 3 is not painted, and the conduction path can be secured.

Hereinafter, the effect of the protrusion 4a in the present invention will be described in detail. Figure 4 is a sectional view showing an example of formation of the coating film in the case of not providing the collision force in the recess of the first member being fastened schematically, FIG. 5 is butt cause the hole in the first member to be fastened which is a cross-sectional view schematically showing an example of formation of the coating film when provided.

Here, there are roughly two types of rivets, a round head rivet and a plate head rivet. In the case of a round head rivet, a masking jig made of an elastic material such as silicon is inserted into the fastening holes of the fastened member 1a and the fastened member 2 to be riveted, and then painted. By removing the masking jig after the painting and fastening the round-head rivet, stable conduction can be secured through the unpainted portion of the member to be fastened and the sleeve of the round-head rivet. On the other hand, when the countersunk head rivets, as shown in FIG. 1, countersunk holes 8a drilled in workpieces 1a has a dish-shaped, the through hole 10a from the bottom surface of the dish hole 8a in the fastened member 1a It penetrates vertically in a direction. This vertical portion does not have a sufficient contact area for inserting and fixing the masking jig, and the inserted masking jig moves. Therefore, when the electrodeposition coating, will penetrate the paint between the masking jig and the recesses and through-holes can not appropriate masking.

This problem, as shown in the right half of FIG. 4, by masking by a masking jig 12 so as to cover the entire countersink to the edge can be (X1 portion in FIG. 4) resolution, in such embodiment, FIG. As indicated by the arrow in the Y1 portion in the left half of 4, there is a problem that an unpainted portion is formed on the edge of the countersink after the coating is completed. As a result, the unpainted portion loses its rust preventive power and the designability is impaired. Further, even if an attempt is made to mask partway through the countersink 8a, the masking jig does not fit well on the slope of the countersink, and the electrodeposition paint enters the clearance between the countersink and the masking jig and is painted, so that a conduction path cannot be secured. There is a problem.

Further, as in Patent Document 1, in the case where the slope of the countersunk hole for rivet fastening has a protrusion extending radially from the center of the through hole, the contact between the protrusion and the masking jig can be masked. Article between from it does not contact with the masking jig, coating through a countersink slope from the gap enters the internal countersink, thus accumulated paint. The accumulated paint is hardened during drying and the countersink is deformed, so that normal rivet fastening cannot be performed.

In order to solve the above problems, the present invention, as shown in FIG. 5, the slopes of the dish hole 8a, so as to surround the through hole 10a (the through hole 10a and is arranged concentrically) convex protrusion 4a The masking jig 12 is provided and fixed by the protrusion 4a and the through hole 10a. In this manner, reliably mask the protrusions 4a, masking jig 12 in contact with the protrusion 4a is that is configured as a lid, preventing paint from entering between the masking jig 12 and the countersunk holes 8a Can be done (Z part of FIG. 5). Since the present invention does not secure the conduction path by breaking the coating film like the above-mentioned patent documents, even if the coating film is a thick film (40 to 100 μm), it is necessary to increase the fastening force more than the conventional one. Without, stable conduction can be secured.

  It is preferable that the protrusion 4a has a height that is equal to or larger than the thickness of the coating film 13 and that does not allow the rivet 3 to project from the surface of the first member 1a to be fastened. This is because it is necessary to ensure electrical continuity, and when the surface of the structure to be fastened has a protrusion, a problem such as another object being caught may occur, and the designability may be impaired. Further, the protrusion 4a is preferably provided perpendicularly to the surface of the recess (the angle α in FIG. 2 is 90 °).

As a method of manufacturing the first member to be fastened 1a having the protrusions 4a, first, the prepared hole 10a is punched in the first member to be fastened 1a, and then processed by a die to form the countersink 8a having the protrusions 4a. can do. Further, since the edge of the outer countersink 8a from collision caused 4a (X2 moiety and Y2 portion in FIG. 5) is coated narrowing contains the paint coating is formed on the edge of the countersink 8a, contained in the coating film The effect of the rust preventive agent can be exhibited, and the designability is not impaired.

Masking jig 12 has elasticity, it is preferable to use a adherable to collision caused 4 a and the through hole 10a. For example, silicone rubber or polytetrafluoroethylene (PTFE) is preferable.

FIG. 6 is a cross-sectional view schematically showing an example of the first member to be fastened (before coating) in Example 2, and FIG. 7 is another example of the first member to be fastened (before coating) in Example 2. It is a sectional view showing typically. The difference from the first embodiment is that the first member to be fastened 1b shown in FIG. 6 has grooves 20 provided on both sides of the protrusion 4b so as to sandwich the protrusion 4b. Cross-sectional shape of the inclined surface of the dish hole 8b is a wave-shaped by having a projection 4b and the groove 20. With such a shape, that both the convex protrusions 4b and the concave groove 20 masking jig bites, it is possible to improve the adhesion between the masking jig, more reliably unpainted You can secure a section. As a result, when the rivets are fastened, it is possible to obtain more stable conduction. Such a fastened member 1b can also be manufactured in the same manner as the fastened member 1a described above.

  Further, as shown in FIG. 7, by providing a plurality of protrusions 4c and arranging the protrusions 4c on the concentric circles surrounding the first through-holes, respectively, there are a plurality of conductive portions, and it is possible to obtain a stable conductive portion. is there.

FIG. 8 is a cross-sectional view and a top view schematically showing an example of the first member to be fastened (before coating) according to the third embodiment. Example 1 differs from the first workpieces 1d shown in FIG. 8 is not perpendicular to the surface of the protrusion 4d dish hole 8d, an acute angle to the surface normal (e.g., 45 ° It is in the point that it is provided as follows. By thus providing the protrusion 4d, and it is possible to improve the adhesion between the masking jig it can be more reliably ensured unpainted portion. As a result, when the rivets are fastened, it is possible to obtain more stable conduction. Such a fastened member 1d can also be manufactured in the same manner as the fastened member 1a described above.

FIG. 9 is a top view schematically showing a first member to be fastened (before coating) according to the fourth embodiment. The rivet holes are usually round holes. In this case, inserting a masking jig of cylindrical shape, it has high adhesion by having a projection 4, but the masking tool is a rotating hard structure, a dish hole 8e, the triangle or more polygons By doing so, it is possible to prevent rotation when inserting the cylindrical masking jig more easily and to fix the cylindrical masking jig more easily than when it is a round hole. As a result, the masking of the through-hole side can be ensured, and the unpainted portion can be more stably secured.

  As described above, according to the present invention, even in a member to be fastened having a thick coating film, a coating failure after fastening is prevented and a continuity between the fastened members is surely secured. It has been shown that it is possible to provide a fastening structure and a method of assembling the fastening structure that are capable of.

  It should be noted that the present invention is not limited to the above-described embodiments, but includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add / delete / replace other configurations with respect to a part of the configurations of the respective embodiments.

1a, 1b, 1c, 1d, 1e ... 1st to-be-fastened member, 2 ... 2nd to-be-fastened member, 3 ... Fastening member (disc head rivet), 30 ... Rivet head part, 31 ... Rivet trunk part, 4a, 4b, 4c, 4d ... collision force, 5 ... conduction path, 6 ... coating of the second member being fastened, 8a, 8b, 8c, 8d, 8e ... recess (countersink), 10 ... through hole, 10a ... first 1 through hole, 10b ... 2nd through hole, 11 ... 1st to-be-fastened member after coating film formation, 12 ... Masking jig, 13 ... 1st to-be-fastened member coating film, 14 ... 1st edge of the through hole, 20 ... groove, 16 ... concave surface, 100 ... fastening structure (switchboard frame), 101 ... frame, 102 ... top plate, 103 ... side face plate, 104 ... Previous faceplate, 105 ... handle, 106 ... Fastening part.

Claims (10)

A fastening structure having two fastened members and a rivet fastening the two fastened members,
One of the members to be fastened has a recess provided from the surface toward the surface on the opposite side, and a first through hole penetrating from the bottom surface of the recess to the surface on the opposite side,
The other of the fastened members has a second through hole,
The rivet is inserted into the recess, the first through hole, and the second through hole to fasten the two fastened members,
The surface of the recess has a protrusion provided around the first through hole, and each of the protrusion and a part of the second through hole is in contact with the rivet,
The two members to be fastened include a portion where the rivet contacts the protrusion, a portion where the rivet contacts a portion of the second through hole, the rivet, the first through hole, and the second through hole. have a coating on a portion other than the portion surrounded by the other parts of the through hole of,
The fastening structure , wherein the recess has a polygonal shape when viewed from above .   The fastening structure according to claim 1, wherein the recess has grooves provided on both sides of the protrusion.   The fastening structure according to claim 1, wherein a plurality of the protrusions are provided, and each of the protrusions is arranged on a concentric circle surrounding the first through hole.   The fastening structure according to claim 1, wherein the protrusion is provided perpendicular to a surface of the recess.   The fastening structure according to claim 1, wherein the protrusion is provided at an angle of 45 ° with respect to a vertical line of a surface of the recess.   The fastening structure according to any one of claims 1 to 5, wherein the protrusion has a height that is equal to or greater than a thickness of the coating film, and that the rivet does not protrude from a surface of the fastening structure. A fastening structure having a thickness.   The fastening structure according to any one of claims 1 to 5, wherein the rivet is a countersunk rivet, the recess is a countersink, and the protrusion is provided on an inclined surface of the countersink. A fastening structure characterized by:   The fastening structure according to any one of claims 1 to 5, wherein the fastening structure is a frame for a switchboard. In a method of assembling a fastening structure in which two fastened members are fastened by rivets,
As the member to be fastened, a concave portion provided from the surface toward the opposite surface, a first through hole penetrating from the bottom surface of the concave portion to the opposite surface, and the first surface on the concave portion A first member to be fastened having a protrusion provided around the through hole, and a second member to be fastened having a second through hole,
A masking jig is inserted into the concave portion and the first through hole of the first member to be fastened, and the masking jig is brought into contact with the protrusion and the first through hole, and the first member to be fastened is contacted with the masking jig. Painting the fastening members,
The masking jig is removed from the first member to be fastened, and the first member to be fastened and the second member to be fastened are arranged so that the first through hole and the second through hole face each other. In combination, the rivet is inserted into the recess, the first through hole, and the second through hole to fasten the first member to be fastened and the second member to be fastened. How to assemble your body. The method for assembling the fastening structure according to claim 9 , wherein before the first member to be fastened and the second member to be fastened are fastened, other than the second through hole of the second fastened member. A method for assembling a fastening structure, characterized in that a coating film is formed on the.

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