JP2018091355A - Fastening structure and method of manufacturing fastening surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To apply a sufficient axial force to a bolt by presenting a sufficient frictional force even in a state where a fastening force between members is a little, and preventing the members from being rotated together when fastening the bolt.SOLUTION: A fastening structure in which multiple metal members are fastened by a fastener comprises: an epoxy resin primer coat applied to at least one of overlapped surfaces of the metal members to be fastened; antislip particles that are adhered to the primer coat; and a top coat applied on an upper surface of the primer coat and an upper side of the antislip particles. Thickness of the primer coat is 10 μm or more and less than 40 μm and a particle diameter of the antislip particles is #60 to 150 mesh.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a fastening structure for fastening a plurality of metal members with a fastener such as a bolt, and a method for manufacturing a fastening surface used in the fastening structure.

  2. Description of the Related Art Conventionally, a method of using a fastener such as a bolt and joining a plurality of metals, and then inserting and fastening bolts into holes provided in these metals has been widely adopted for joining metals. . In this fastening structure, if the frictional force between the overlapped metals is weak, when the force is applied to the metal in the direction orthogonal to the axial direction of the bolt or in the axial direction, the metals are displaced. As a result, there is a problem that slip occurs between the metal and the bolt and the bolt is loosened.

  Therefore, for the purpose of suppressing slippage between the two members and preventing the occurrence of abnormal noise and the loosening of the bolts, JP 2006-22948A includes an abrasive between the first member and the second member. In the fastened state of the first member and the second member, a part of the abrasive is sandwiched between the surfaces of the first member and the second member, and the embedded polishing is performed. The fastening structure which increases the frictional force between two members with an agent is disclosed.

JP 2006-22948 A

  However, in the fastening structure disclosed in Patent Document 1, after a sufficient axial force is applied to the bolt and the two members are fastened with a normal force, a sufficient frictional force is generated between the two members. Although the effect of preventing loosening is exhibited, the applied wax plays a role of lubrication or polishing when a sufficient fastening force (pressure) is not applied between the two members at the time of tightening the bolt. The situation where the agent peels off and rolls between the two members does not necessarily occur, and there is a possibility that the frictional force is reduced instead. For this reason, at the time of bolt tightening, the member may rotate together with the rotation of the bolt, and the torque count value may change due to the rotation of the bolt, and it may not be possible to apply a normal axial force to the bolt. There was a need to take measures to prevent co-rotation.

  The present invention has been made in view of the above points, and exhibits a sufficient frictional force not only after a plurality of members are fastened with a normal force but also in a state where the fastening force between the members is weak, and tightening of the bolts It is an object of the present invention to provide a fastening structure and a method of manufacturing a fastening surface that can prevent the members from rotating together and provide a sufficient axial force to the bolt.

1) The fastening structure of the present invention is
In a fastening structure for fastening a plurality of metal members with a fastener,
An epoxy resin-based primer coating coated on at least one of the overlapping surfaces of the metal member to be fastened;
Non-slip particles bonded to the primer coating;
A top coat coated from the surface of the primer coat and the anti-slip particles;
It is characterized by providing.

  According to the fastening structure of the present invention, since the primer coating film is an epoxy resin system, it has excellent adhesion to the base. For this reason, even before the anti-slip particles bite into the surface of the metal member in a state where the fastening force between the metal members at the time of tightening the bolt is insufficient, the coating film is not peeled off and slipped from the base, Sufficient frictional force can be exhibited between metal members. In addition, a strong coating film is formed by the epoxy resin-based primer coating film. For this reason, when the fastening force between the metal members at the time of tightening the bolts is insufficient, the anti-slip particles are not peeled even if a force in a sliding direction is generated between the metal members. Thereby, anti-slip | skid particle | grains do not roll between metal members, but a frictional force can be exhibited from the state where the fastening force of metal members is weak.

2) A preferred example of the fastening structure of the present invention is
The primer coating film has a thickness of 10 μm or more and less than 40 μm.

  According to the preferable example of the fastening structure of the present invention, the film thickness of the primer coating film is kept within a predetermined value, so that the above-described effects can be exhibited more.

3) A preferred example of the fastening structure of the present invention is
The anti-slip particles have a particle size of # 60 to 150 mesh.

  According to a preferred example of the fastening structure of the present invention, since the particle size of the anti-slip particles is set to the above-mentioned particle size, the anti-slip particles are not peeled off at the time of fastening, and the anti-slip particles are appropriately placed on the surface of the metal member. It can bite and exhibit a high anti-slip effect.

4) A preferred example of the fastening structure of the present invention is
Provided with a preliminary coating pre-painted on the metal member,
The primer coating is coated on the surface of the preliminary coating.

  According to a preferred example of the fastening structure of the present invention, since a preliminary coating film is provided in advance, it can be distributed in a state in which rust prevention coating or the like is applied in a product in a field where rust is not desired, or an in-process product.

5) A preferable example of the fastening structure of the present invention is
The top coating film is a melanin alkyd coating film.

  According to a preferred example of the fastening structure of the present invention, since the top coat film is a melanin alkyd-type paint film, it is excellent in economic efficiency and the production cost can be reduced.

6) The manufacturing method of the fastening surface of the present invention includes:
In the method for manufacturing a fastening surface in a fastening structure in which a plurality of metal members are fastened with a fastener,
A primer coating step of coating an epoxy resin-based primer coating on at least one of the overlapping surfaces of the metal member to be fastened;
Before the primer coating is completely dried, a non-slip particle adhesion step for adhering the non-slip particles to the primer coating; and
A top-coating step of applying a top-coating film from the surface of the primer coating and the anti-slip particles;
It is characterized by including.

7) A preferred example of the method for manufacturing the fastening surface of the present invention is as follows:
The primer coating film has a thickness of 10 μm or more and less than 40 μm.

8) A preferable example of the method for manufacturing the fastening surface of the present invention is as follows:
The anti-slip particles have a particle size of # 60 to 150 mesh.

9) A preferred example of the method for manufacturing the fastening surface of the present invention is as follows:
Including a pre-coating step of pre-coating a pre-coating film on the metal member;
The primer coating is coated on the surface of the preliminary coating.

10) A preferred example of the method for manufacturing the fastening surface of the present invention is as follows:
The top coating film is a melanin alkyd coating film.

  According to these fastening surface manufacturing methods of the present invention, when the fastening surface is used in a fastening structure, the same effects as those of the fastening structure described above can be achieved.

  As described above, according to the fastening structure and the manufacturing method of the fastening surface of the present invention, sufficient friction is achieved not only after fastening a plurality of members with a normal force but also in a state where the fastening force between the members is weak. It is possible to exert a force, prevent the members from rotating together when tightening the bolt, and apply a sufficient axial force to the bolt.

It is the figure which represented typically the state before fastening of the fastening structure which concerns on one Embodiment of this invention. It is the figure which represented typically the state after fastening of the fastening structure which concerns on one Embodiment of this invention. It is a figure which shows the result of a primer paint evaluation experiment. It is a figure which shows the result of top coat paint evaluation experiment. It is a figure which shows the result of a primer film thickness evaluation experiment. It is a figure explaining the axial force measurement of a volt | bolt.

  Hereinafter, embodiments of a fastening structure of the present invention will be described in detail with reference to the accompanying drawings. In addition, the fastening structure of this invention is implement | achieved using the fastening surface manufactured by the manufacturing method of the fastening surface which concerns on this invention. FIG. 1 schematically shows a state before the fastening structure according to one embodiment of the present invention is fastened, and FIG. 2 schematically shows a state after the fastening structure according to one embodiment of the present invention is fastened. FIG.

  As shown in FIG.1 and FIG.2, the fastening structure 1 of this embodiment is equipped with the main body side member 10, the to-be-fastened member 11, the washer 20, and fasteners, such as a volt | bolt and a nut which are not shown in figure. The main body side member 10, the member to be fastened 11, and the washer 20 are also provided with a hole (not shown) for inserting or screwing the fastener.

  The main body side member 10 is, for example, a metal frame of an automobile or the like, and its surface is mainly subjected to coating such as cationic electrodeposition coating for the purpose of rust prevention. Is provided.

  The member 11 to be fastened is, for example, various members made of metal that are fastened to a vehicle frame or the like with a fastener such as a bolt. The surface is coated with a cation electrodeposition coating or the like in the same manner as the main body side member 10, and a rust-preventing coating film 13 is formed by this coating.

  The washer 20 is sandwiched between the main body side member 10 and the fastened member 11, and is made of a metal washer main body 21, a preliminary coating film 22, a primer coating film 23, an anti-slip particle 24, and an overcoat. And a coating film 25.

  The preliminary coating film 22 is applied to a metal washer main body 21 that has been pressed or the like mainly for the purpose of rust prevention. For example, a cationic electrodeposition coating or the like has a thickness of 10 μm or more and less than 30 μm, Preferably, it is applied at 15 μm or more and less than 25 μm. Note that the preliminary coating film 22 is not an essential component, and may be omitted if rust prevention is not required, such as coating the primer coating film 23 immediately after processing the washer body 21.

  The primer coating film 23 is applied to the surface of the preliminary coating film 22. As a kind of paint used for the primer coating film 23, enamel paint, epoxy paint, polyolefin paint, polyurethane paint, aminoalkyd paint, and the like can be employed. In this embodiment, an epoxy-based paint is employed. Further, the film thickness of the primer coating film 23 is preferably 10 μm or more and less than 40 μm, and more preferably 20 μm or more and less than 30 μm. This is because if the film thickness of the primer coating film 23 is thin, the adhesion of the anti-slip particles 24 is deteriorated and the primer coating film 23 is easily peeled off. On the other hand, if the primer coating film 23 becomes too thick, the primer coating film 23 tends to sag during coating, and the anti-slip particles 24 are excessively adhered, and the anti-slip particles 24 on the surface easily peel off. .

  When the fastening structure 1 of the present embodiment is fastened, the anti-slip particles 24 bite into the metal portions of the main body side member 10, the fastened member 11, and the washer 20 to increase the frictional force between the members. The primer coating 23 is adhered. The anti-slip particles 24 are preferably particles that have corners and are harder than the metal material used in the fastening structure 1 of the present embodiment and do not corrode the metal. Green silicon carbide, black silicon carbide, brown fused alumina, white fused alumina, boron carbide, diamond powder, etc. can be employed. In the present embodiment, green silicon carbide or black silicon carbide is employed from the viewpoint of availability and cost.

  In addition, although it is the particle size (particle size) of the anti-slip | skid particle | grains 24, # 60-150 mesh is preferable and # 80-120 mesh is more preferable. This is because if the particle size of the anti-slip particles 24 is too large, the adhesive force of the anti-slip particles 24 by the primer coating film 23 becomes weak. For this reason, when the fastening structure 1 is fastened, the anti-slip particles 24 are easily peeled off from the primer coating film 23 and roll between the members, which may cause a decrease in frictional force. Furthermore, if the particle size of the anti-slip particles 24 is too large, the anti-slip particles 24 bite into the metal portions of the main body side member 10 and the fastened member 11 and the main body side member 10 and the fastened member 11 are damaged. Because there is a risk of giving. On the other hand, if the particle size of the anti-slip particles 24 is too small, the total film thickness of the rust preventive coating films 12 and 13, the top coat film 25, and the primer coat film 23 of the main body side member 10 or the fastened member 11 is compared. This is because the non-slip particles 24 become smaller and the biting into the metal portion becomes smaller, which may cause a reduction in frictional force.

  In addition, said # 60-150 mesh or # 80-120 mesh is the particle size of the grinding wheel abrasive | polishing material prescribed | regulated by Japanese Industrial Standard. In detail, the anti-slip | skid particle | grains 24 of the particle size of F60-F150 or F80-F120 prescribed | regulated by JISR6001 are intended. In addition, as the particle size of the anti-slip particles 24, a standard approximate to the standard defined above can be used. For example, a P standard according to JIS R 6010 can be used.

  The top coating film 25 is applied to the surface of the primer coating film 23 and the non-slip particles 24 bonded to the primer coating film 23, and has an action of bonding the non-slip particles 24 more firmly. , Improve the appearance on the appearance. As the type of paint used for the top coat film 25, melanin alkyd paint, urethane paint, fluorine paint, acrylic paint, aminoalkyd paint, acrylic urethane paint, and the like can be employed. In this embodiment, a melanin alkyd paint is employed.

  The film thickness of the top coat film 25 is preferably 10 μm or more and less than 40 μm, and more preferably 20 μm or more and less than 30 μm, in terms of the film thickness in the absence of the anti-slip particles 24. This is because if the film thickness of the top coat film 25 is too thin, the effect of increasing the adhesion of the anti-slip particles 24 is diminished. On the other hand, if the film thickness of the top coat film 25 is too thick, the anti-slip particles 24 are buried in the top coat film 25, and the anti-slip particles 24 do not bite into each other and the frictional force between the members is reduced. This is because there is a risk of lowering.

  And by sandwiching the washer 20 between the main body side member 10 and the member to be fastened 11 and fastening with a fastener such as a bolt or nut (not shown) and applying a fastening force (pressure) to the fastening surface 2, As shown in FIG. 2, the anti-slip | skid particle | grains 24 bite into a mutual metal part, and the fastening structure 1 which exhibits a high frictional force is implement | achieved.

  Next, the manufacturing method of the fastening surface 2 used for the fastening structure 1 of this embodiment is demonstrated. In the manufacturing method of the fastening surface 2 of the present embodiment, the fastening surface 2 that increases the frictional force is applied to both surfaces of the washer 20, and thus the washer 20 will be described. In addition, the main body side member 10 and the member to be fastened 11 in the fastening structure 1 of the present embodiment are provided with rust preventive coatings 12 and 13 by a known cationic electrodeposition coating or the like on a metal member that has been subjected to press working or the like. Therefore, the description of the manufacturing method is omitted here.

  The fastening surface 2 of the washer 20 is subjected to a process including a preliminary coating process, a primer coating process, a non-slip particle adhesion process, and a top coating process on a washer body 21 made of a known press-worked metal member. Manufactured.

  In the preliminary coating step, the metal washer main body 21 that has been subjected to press working or the like is subjected to coating such as cationic electrodeposition coating mainly for the purpose of rust prevention during distribution or the like, thereby forming the preliminary coating film 22. The film thickness of the preliminary coating film 22 at this time is preferably 10 μm or more and less than 30 μm as described above, and more preferably 15 μm or more and less than 25 μm. In addition, this preliminary | backup coating process can also be abbreviate | omitted when there is no need for rust prevention as mentioned above.

  In the primer coating process, a primer coating 23 is applied to the surface of the preliminary coating 22. Before the primer coating 23 is completely dried, the next anti-slip particle adhesion step is performed. In this embodiment, the anti-slip particle adhering step is performed when the touch is dry, which is a dry state where no paint is applied to the finger when the finger is lightly touched on the painted surface.

  In the non-slip particle adhesion step, the washer-dried washer body 21 is submerged in the anti-slip particles placed in a container or the like that allows the washer 20 to be taken in and out, and the anti-slip particles 24 Is attached to the primer coating 23. Next, when the washer body 21 is pulled up from the container, only the non-slip particles 24 attached to the primer coating film 23 remain, and the anti-slip particles 24 are adhered. The anti-slip particle adhesion step is not limited to the above example, and various methods such as spraying the anti-slip particles 24 from above the primer coating film 23 and spraying the anti-slip particles 24 onto the primer coating film 23 are possible. Can be adopted.

  In the next topcoat coating step, a topcoat film 25 is further applied from the surface of the primer film 23 and the antislip particles 24. By the top coat film 25, the adhesion state of the anti-slip particles 24 becomes stronger. Moreover, the non-slip particles 24 and the underlying primer coating film 23 can be given any color by the top coating film 25, and the aesthetics of the product can be improved. And the fastening surface 2 is manufactured by putting the washer 20 which passed through these processes into a drying furnace etc. and drying it.

  Next, referring to FIG. 3 to FIG. 6, in the manufacturing method of the fastening structure 1 and the fastening surface 2 of the present embodiment, the primer paint evaluation experiment and the top coating that are the reasons for selecting the paint material and the film thickness described above. The experimental results of the paint evaluation experiment and the primer film thickness evaluation experiment will be described. FIG. 3 is a diagram showing the results of the primer paint evaluation experiment, FIG. 4 is a diagram showing the results of the top coat paint evaluation experiment, and FIG. 5 is a diagram showing the results of the primer coating film thickness evaluation experiment. FIG. 6 is a diagram for explaining a method of measuring the axial force of the bolt.

  First, a primer paint evaluation experiment will be described with reference to FIG. As a paint film with a primer paint, a test piece made of an iron plate having a thickness of 3 mm was applied with an enamel paint, an epoxy paint, a polyolefin paint, a polyurethane paint, or an aminoalkyd paint to form a primer paint film 23. . Next, the paint adhesion of the primer coating film 23 was evaluated by an adhesion (cross-cut method) test method for measuring the mechanical properties of the coating film stipulated in Japanese Industrial Standards, JIS K5600-5-6. As a result, all the paints were classified as “0” and were good. The adhesion of the primer coating film 23 was the same even when the preliminary coating film 22 was formed by cationic electrodeposition coating.

  Next, in the same primer paint evaluation experiment, the adhesion of the non-slip particles 24 was evaluated. In this experimental method, a test piece made of an iron plate having a thickness of 3 mm was applied with an enamel paint, an epoxy paint, a polyolefin paint, a polyurethane paint, or an amino alkyd paint to form a primer coating film 23. Make two by two. Next, when the primer coating film 23 of these test pieces was dry to the touch, one test piece was submerged in the non-slip particles to attach the anti-slip particles 24. Next, a metal block was placed on the test piece, and the thickness between the non-slip particles 24 and the non-slip particles 24 was measured with a height gauge, and the difference was obtained. And the thing with a big difference of a measurement and the layer of the anti-slip | skid particle | grains 24 was evaluated as a coating material excellent in adhesiveness. In this evaluation, it was found that a coating film made of an epoxy-based paint was most excellent in adhesion of the non-slip particles 24. In addition, the epoxy paint is most cost-effective, and it can be seen from these facts that the paint used for the primer coating film 23 is preferably an epoxy paint. In addition, the film thickness of the primer coating film 23 in these primer coating film evaluation experiments was set to 20 μm or more and less than 30 μm.

  Next, with reference to FIG. 4, a top coating paint evaluation experiment will be described. In the above primer paint evaluation experiment, it was found that an epoxy paint was preferable, and therefore, an epoxy paint was used for the primer coating film 23. Here, the adhesion of the coating film (cross-cut) was applied by directly applying the top coating film on the primer coating film without attaching the anti-slip particles to the primer coating film 23. Method) A test (JIS K5600-5-6) was conducted. When the adhesion was tested using melanin alkyd paint, urethane paint, fluorine paint, acrylic paint, aminoalkyd paint, acrylic urethane paint as the top coat, it was classified as "0" in all paints. It was good. In addition, melanin alkyd paint is most cost effective. From these facts, it is understood that a melanin alkyd paint is preferable as the paint used for the top coat film 25. In addition, the film thickness of the top coat film 25 in these top coat film 25 evaluation experiment was 20 micrometers or more and less than 30 micrometers. Moreover, the adhesiveness of the top coat film 25 was the same result even if there was the preliminary coating film 22 by cationic electrodeposition coating.

  Next, with reference to FIGS. 5 and 6, the primer coating film thickness evaluation experiment will be described. In the above-mentioned primer paint evaluation experiment and topcoat paint evaluation experiment, it was found that epoxy paint and melanin alkyd paint were preferable, respectively, and experiments were performed while changing the film thickness of the primer coating film 23 using these paints. As the evaluation criteria of the experiment, the adhesion of the non-slip particles 24 to the primer coating film 23, the evaluation of the primer coating film by visual observation of the primer coating film, and when the fastening structure is actually fastened by the bolt 30 and the nut 31 are used. Axial force was used.

  First, of the evaluation of the primer coating film 23, the adhesion of the non-slip particles 24 to the primer coating film 23 was evaluated. The adhesion of the anti-slip particles 24 was evaluated with respect to the thickness of the anti-slip particles 24 adhered and the ease of peeling. The experiment of the thickness of the non-slip particles 24 adhered was performed by the following method. First, two test pieces made of an iron plate having a thickness of 3 mm are coated with an epoxy paint to form two primer coating films. Next, when the primer coating film of these test pieces is in a dry-to-touch state, one of the test pieces is submerged in the non-slip particles, and the non-slip particles 24 are adhered. Next, a metal block was placed on the test piece, and the thickness between the non-slip particles 24 and the non-slip particles 24 was measured with a height gauge, and the difference was obtained.

  Further, the evaluation of the ease of peeling off of the attached anti-slip particles 24 was made by attaching the anti-slip particles 24 on the primer coating film 23 formed on a test piece made of an iron plate having a thickness of 3 mm, and further applying an overcoat. A coating film 25 is formed. Then, after drying, the surface was traced with a finger, and evaluation was made based on whether or not the anti-slip particles 24 were peeled off and adhered to the finger.

  Next, the axial force was measured by the method shown in FIG. 6 using the washer 20 having the fastening surface 2 manufactured by the above-described manufacturing method. This is prepared by providing a bolt 30 and a nut 31 with a strain gauge mounted on the shaft thereof, and a washer between the body-side member 10 and the member to be fastened 11 provided with the anticorrosive coatings 12 and 13 made of cationic electrodeposition coating. 20, the bolt 30 and the nut 31 are tightened with a predetermined torque, and the axial force is measured by the elongation of the strain gauge 32. Note that two signal lines 33 extend from the strain gauge 32 and are connected to a measuring instrument (not shown).

  As a result, when the film thickness of the primer coating film 23 was 10 μm or more and less than 20 μm, the anti-slip particle adhesion was poor, and the anti-slip particle layer was thin. For this reason, it was bad as evaluation of a primer coating film. However, the anti-slip particles did not peel off when the surface was traced with a finger. Also, the axial force is generally good and can be used as a product.

  Next, when the film thickness of the primer coating film 23 was 20 μm or more and less than 30 μm, the adhesion of the anti-slip particles 24 was good, and the thickness of the anti-slip particle layer was sufficient. Further, when the surface was traced with a finger, the non-slip particles were not peeled off. For this reason, the evaluation of the primer coating film is the best, and the axial force is also the best, which is optimal for making a product.

  Next, when the film thickness of the primer coating film 23 was 30 μm or more and less than 40 μm, the adhesion of the anti-slip particles 24 was good, and the thickness of the anti-slip particles was sufficient. However, the anti-slip particle layer was too thick, and when the surface was traced with a finger, the anti-slip particle was slightly peeled off. For this reason, although it is not good as evaluation of a primer coating film, it can be used as a product. Also, the axial force is in a range that can be used as a product.

  Next, when the film thickness of the primer coating film 23 was 40 μm or more, the adhesion of the anti-slip particles 24 was good, and the thickness of the anti-slip particle layer was sufficient. However, the non-slip particles were too thick, and the anti-slip particles were peeled off when the surface was traced with a finger. Moreover, the primer coating film was too thick, and some of the painted surface sagged. For this reason, it was not suitable for a product, and the evaluation of the primer coating film was bad. Also, the axial force was bad.

  Although not shown in FIG. 5, when the film thickness of the primer coating film 23 is less than 10 μm, the adhesion of the anti-slip particles 24 becomes very poor, resulting in unevenness and the primer coating under the anti-slip particles. The film can be seen. For this reason, it is not suitable as a product, and axial force measurement is not performed.

  From these facts, it can be seen that the thickness of the primer coating film 23 that can be used as a product is 10 μm or more and less than 40 μm, and more preferably 20 μm or more and less than 30 μm.

  As described above, according to the fastening structure and the manufacturing method of the fastening surface of the present embodiment, the optimum coating material and film thickness are selected for the primer coating film and the top coating film. It adheres firmly, and the coating film is not peeled off and slipped by a lateral force caused by tightening a bolt or the like when the fastening structure is fastened. Similarly, since the optimum paint and film thickness are selected for the primer coat and top coat, the anti-slip particles are firmly adhered to the primer coat, giving a sufficient fastening force (pressure) between the members. Even if it is not, the anti-slip particles are not peeled off, and a high frictional force can be exhibited from the initial stage of fastening.

  By these, the joint rotation of the member at the time of bolt fastening can be prevented, and a stable axial force can be given to the bolt. And while being able to fasten a member firmly, loosening of a bolt can be prevented. In addition, since the member can be firmly fastened, it can be securely fastened even with a weak axial force. Thereby, the diameter of a bolt can also be made thinner than before, which can contribute to cost reduction and weight reduction.

1 .... fastening structure, 2 .... fastening surface,
10 .. Main body side member, 11 .. Fastened member, 12, 13 .. Antirust coating,
20 .. washer, 21 .. washer body, 22 .. preliminary coating, 23 .. primer coating, 24 .. non-slip particles, 25 .. top coating,
30 ... Bolt, 31 ... Nut, 32 ... Strain gauge, 33 ... Signal line,

Claims (10)

In a fastening structure for fastening a plurality of metal members with a fastener,
An epoxy resin-based primer coating coated on at least one of the overlapping surfaces of the metal member to be fastened;
Non-slip particles bonded to the primer coating;
A top coat coated from the surface of the primer coat and the anti-slip particles;
A fastening structure comprising:   The fastening structure according to claim 1, wherein a film thickness of the primer coating film is 10 μm or more and less than 40 μm.   The fastening structure according to claim 1 or 2, wherein the particle size of the non-slip particles is # 60 to 150 mesh. Provided with a preliminary coating pre-painted on the metal member,
The fastening structure according to any one of claims 1 to 3, wherein the primer coating is coated on a surface of the preliminary coating.   The fastening structure according to any one of claims 1 to 4, wherein the top coating film is a melanin alkyd coating film. In the method for manufacturing a fastening surface in a fastening structure in which a plurality of metal members are fastened with a fastener,
A primer coating step of coating an epoxy resin-based primer coating on at least one of the overlapping surfaces of the metal member to be fastened;
Before the primer coating is completely dried, a non-slip particle adhesion step for adhering the non-slip particles to the primer coating; and
A top-coating step of applying a top-coating film from the surface of the primer coating and the anti-slip particles;
The manufacturing method of the fastening surface characterized by including.   The method for manufacturing a fastening surface according to claim 6, wherein a film thickness of the primer coating film is 10 μm or more and less than 40 μm.   The method for manufacturing a fastening surface according to claim 6 or 7, wherein the particle size of the anti-slip particles is # 60 to 150 mesh. Including a pre-coating step of pre-coating a pre-coating film on the metal member;
The method for manufacturing a fastening surface according to any one of claims 6 to 8, wherein the primer coating is coated on a surface of the preliminary coating.   The method for manufacturing a fastening surface according to any one of claims 6 to 9, wherein the top coating film is a melanin alkyd coating film.

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