JP3209314B2 - Steel plate for high strength bolt friction welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate for high-strength bolt friction welding.

[0002]

2. Description of the Related Art For example, a steel plate for connection at a bolted joint between a box column of construction aggregate and an H-shaped steel beam has a friction coefficient of 0.4 specified in Article 92-2 of the Ordinance of the Building Standard Law.
There is a standard of 5 or more. Conventionally, to meet this standard,
In general, it has been practiced to produce fine rust on the surface of a steel sheet to increase the surface roughness and improve the coefficient of friction, thereby satisfying the above standards. However, in recent high-rise buildings and the like, the number of bolts used for bolt joints between box columns and H-shaped steel beams has exceeded 100, which is a factor that significantly reduces workability. For this reason, attempts have been made to increase the friction coefficient of the surface of the joining steel plate to reduce the number of bolts used. For example, JP-A-1-164807
In the publication, silicon carbide (Si) is provided between the joining steel plate and the joining surface.
C) It is disclosed that the friction coefficient is increased by an anchor effect caused by the grid being sandwiched between the grids and bolting when the bolts are fastened. In addition, carbon dioxide (CO ₂ )
It is also known to increase the coefficient of friction by cutting a triangular groove in a frictional joint surface with a laser.

[0003]

As described above, when the friction coefficient of the surface is improved by sandwiching the silicon carbide grid between the joining surfaces, when the friction surface starts sliding, the grid starts to slide and the friction coefficient increases. Is about 0.5% and the friction coefficient due to rust generation is only about 10% increase, and the effect of reducing the number of joints by high strength bolts cannot be expected. On the other hand, grooves are formed by CO ₂ laser. When the coefficient of friction is increased by increasing the coefficient of friction to 0.9 or more, the work of forming (carving) a groove requires a long time, and the cost is high due to the use of a laser, which makes the product practical. There is a problem that it is extremely difficult to achieve such The present invention has been made to advantageously solve such problems, and when forming a large number of columnar projections on the surface of the steel sheet to be the joining surface when the steel sheet for joining by cutting and drilling, the surface of the steel sheet is formed. To provide a high-strength bolt friction-joining steel sheet capable of sufficiently and surely increasing a friction coefficient, maintaining the stability of a joint portion, and reducing the number of high-strength bolts used for fastening to improve work efficiency. It is the purpose.

[0004]

The steel plate for high-strength bolt friction welding according to the present invention comprises a large number of columnar projections having a flat top on the surface mainly of the steel plate, a columnar projection interval p, and a columnar projection representative diameter. d, when the height of the columnar protrusion is h, 1 <p / d <10
³ and 0.1 <h / d <100.

[0005]

The steel plate for friction welding of high strength bolts can be bonded to the surface of the steel beam joint by using high strength bolts by abutting the surfaces on which a number of cylindrical projections are arranged on both sides of the joint. The friction coefficient is extremely high due to the large number of cylindrical projections, which enables strong steel beams to be joined and the stability of the joints to be maintained, and the number of high-strength bolts to be used can be reduced. The work efficiency can be remarkably improved even in a high place work such as the above.

Next, the present invention will be described in detail with reference to FIGS. Reference numeral 1 denotes a steel sheet for high-strength bolt friction joining according to the present invention, and 11 and 11 denote two steel sheets for joining in which the high-strength bolt friction joining steel sheet 1 is cut to a required size and bolt holes are drilled. It is a steel beam that is joined by high strength bolts and nuts. This high-strength bolt friction-joining steel sheet 1
In the figure, a large number of columnar projections 3 having sharp edges are arranged on one surface of a steel plate main body 2 at required intervals to increase the friction coefficient of the steel plate surface.

The cylindrical projection 3 on one side of the steel plate main body 2 is shown in FIG.
As shown in FIG. 5, the interval p between the columnar projections and the representative diameter d of the columnar projections
Is 1 <p / d <10 ³ , and the ratio h / d of the height h of the columnar projections to the representative diameter d of the columnar projections is 0.1 <.
h / d <100, and the number of cylindrical projections 3 is such that the coefficient of friction of the surface of the steel plate main body 2 is a predetermined value capable of clearing the numerical values stipulated in the Building Standard Act. In the embodiment, it is set to 0.9 or more. Further, since the large number of columnar projections 3 are formed integrally with the steel plate main body 2 formed by removing a part of the surface of the steel plate main body 2, they are not separated.

The steel plate for high-strength bolt frictional joining constructed as described above is cut into a size corresponding to the joint of the steel beams 11, 11 whose joining ends are abutted as shown in FIG. Then, bolt holes 4a are drilled at necessary places to form the required steel plate for joining. On the other hand, bolt holes 4b are also drilled at the joints of the steel beams 11, 11 whose joining ends are abutted. Then, the steel plate for contact is brought into contact with both surfaces of the joint portions of the steel beams 11, 11 with the surfaces on which the columnar projections 3 are provided, and the bolt holes 4a, 4b, and 4
If a high-strength bolt is penetrated by a conventional method through a and fastened by a nut, the two steel beams 11, 11 are firmly joined. That is, according to the present invention, 1 <p / d <10 ³ and 0.1 <h / d <1 on the surface of the steel plate main body 2.
Since the friction coefficient of the surfaces of the steel plates 2 and 2 can be increased by the large number of columnar projections 3 arranged so as to satisfy the formula of 00, strong joining can be achieved. It is possible to remarkably improve the work efficiency even in the case of a fastening work in a high place work such as a construction site by reducing the number. When the columnar projection 3 does not satisfy the above-described formula, for example, when p / d exceeds 10 ³ , the flat section 6 between the projections bends and comes into contact with the surface of the steel beam 11. It is not possible to expect biting into No. 11, and the friction coefficient does not increase. H / d is 10
If it exceeds 0, the columnar projection 3 will buckle at the time of fastening with a high strength bolt, and the intended purpose cannot be achieved.

Next, the method of forming a large number of columnar projections 3 on the surface of the steel plate main body 2 as described above is not limited, but a typical example is an etching method. This is achieved by applying micro-patterning on the surface of the joining steel plate 2 by applying micro-patterning so that the ratio of the columnar protrusion interval p, the columnar protrusion representative diameter d, and the columnar protrusion height h satisfies the above-mentioned formula.
(In this case, the height h of the columnar protrusion is determined by the subsequent etching depth). Examples of such a resist agent 5 include a photosensitive curable resin, a thermosetting resin, a water-resistant ink, and the like. After the mark, the resist is cured by heating with a laser beam or the like, heated or dried and cured. As shown in the figure, the surface of the steel plate main body 2 excluding the portion where the resist agent 5 is marked is etched at a depth such that the height h of the columnar projections becomes a predetermined value within a range satisfying the above-described formula, and the tip end edge is formed in a columnar shape with a sharp edge. Only the protrusions 3 are left so as to protrude, and then the above-described resist agent 5 is removed to obtain the high-strength bolt friction-joining steel sheet 1 according to the present invention as shown in FIG.

As the etching method as described above, for example, a steel plate main body 2 is brought into contact with a commonly used steel etching agent to remove the portion where the resist agent 5 is marked.
Or a chemical etching method for etching the surface of the steel plate, or immersing the steel plate main body 2 marked with the resist agent 5 in the electrolytic solution to dispose electrodes on the marked surface of the resist agent 5, and using the steel plate main body 2 as an anode and the electrode as a cathode. There is an etching method such as an electrolytic etching method for etching the surface of the steel plate main body 2 except for the portion where the resist agent 5 is marked by performing
When a large number of cylindrical projections 3 are formed on the surface of the steel plate main body 2 by an etching method in combination with the micro patterning as described above, a triangular groove is formed by laser to increase the friction coefficient of the steel plate surface. It is particularly preferable because the processing cost is lower and the cost can be provided at a lower cost as compared with the case in which the cylindrical projections 3 are formed. However, the cylindrical projections 3 may be formed by other economic means such as a shot blast method.

[0011]

Next, examples of the present invention will be described together with comparative examples.

[Table 1]

Note 1: The columnar projections in the examples are formed by printing a mark on the surface mainly of a steel plate by a screen printing method using a screen using a resist agent (water-resistant ink) as a mask material, and then air drying. (At room temperature for 10 minutes), and then formed by a chemical etching method of immersing in a 25% aqueous ferric chloride solution (70 ° C.) for 3 minutes. Note 2: Rust generation in Comparative Example 1 was performed by leaving the yard for 2 weeks. Note 3: Grid sandwiched in Comparative Example 2 is made of silicon carbide (Si
C) A grid (powder) coated on a 0.1 mm thick paper with a binder was sandwiched between a steel plate for joining and a steel beam to be joined. Note 4: Friction coefficient is 100kg / mm with 6 F10T bolts
^It was fastened with a torque of ² and performed by a sliding friction test based on the Building Standards Law.

[0013]

According to the present invention, the friction coefficient of the steel sheet main surface can be increased and the joining strength can be improved, so that the safety of the joined portion can be reliably maintained. Also, since the joining strength can be improved, the number of high-strength bolts used for fastening can be reduced, and the joining work efficiency at a high place can be remarkably improved. In addition, since the cylindrical projections disposed on the surface of the steel sheet can be obtained by an economical method such as an etching method, when a triangular groove is formed by a laser to increase the friction coefficient of the steel sheet surface. There is also an advantage that the processing cost is low and it can be provided at low cost. Therefore,
The present invention solves the problems of the conventional steel plates for high-strength bolt friction joining, and there is an extremely large one that contributes to industrial development.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing an example of the present invention.

FIG. 2 is an explanatory view showing a step of forming a columnar projection.

FIG. 3 is a perspective view showing a joint state of steel beams using the present invention.

[Description of Signs] 2 Mainly made of steel plate 3 Columnar protrusion 6 Flat portion between protrusions

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shuji Inoue 5-3 Tokai-cho, Tokai City, Aichi Prefecture Nippon Steel Corporation Nagoya Works (72) Inventor Motohiro Okushima 5-3, Tokai-cho, Tokai City, Aichi Prefecture Nippon Steel Corporation Nagoya Works (56) References JP-A-1-266309 (JP, A) JP-A-7-9003 (JP, A) JP-A-7-83211 (JP, A) JP JP-A-6-330567 (JP, A) JP-A-4-237744 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16B 5/00-5/12 E04B 1/40-1 / 58

Claims (2)

(57) [Claims] A large number of columnar projections having a flat top on the surface mainly composed of a steel plate are formed by the following formulas: the ratio between the interval between the columnar projections and the ratio of the columnar projection representative diameter, and the ratio between the columnar projection height and the columnar projection representative diameter. A high-strength bolted steel sheet for friction joining, which is arranged so as to satisfy the following. 1 <p / d <10 ³ 0.1 <h / d <100, where p: interval of columnar projections, d: representative diameter of columnar projections,
h: Height of columnar projection 2. The method according to claim 1, wherein the columnar projection having a flat top is formed of a resist material.
After the mark is cured, the area where the resist agent is marked
The steel sheet for high-strength bolt friction joining according to claim 1, wherein the steel sheet is formed by etching a surface of a steel sheet main body excluding the above.