JPH11244975A - Production method of extra fine deformed reinforcing bar - Google Patents

Abstract

(57) [Problem] To provide an ultrafine deformed reinforcing bar manufacturing method which can be easily manufactured at low cost. SOLUTION: The method for manufacturing an ultrafine deformed reinforcing bar according to the present invention includes forming a hole 1a having substantially the same diameter as the diameter of a valley 10a to be obtained in a steel sheet 1, and forming a steel sheet at a diameter position of the hole 1a formed in the steel sheet 1. Mold 2 (upper mold) and Mold 3 (lower mold) created by dividing 1 into two
Are arranged at predetermined intervals, and the wire 10 to be sent is pressed in a sandwiching shape by the hole mold 2 and the hole mold 3 to obtain an irregular shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing
The present invention relates to a method for manufacturing an extra-fine deformed reinforcing bar capable of easily and inexpensively producing an extra-fine deformed reinforcing bar of about 2 mm.

[0002]

2. Description of the Related Art In the civil engineering industry, a model experiment is always performed in designing a structure using a new structure type, and the structure is actually adopted only after its strength characteristics are proved. Structures using reinforced concrete are no exception, and experiments are conducted on full-scale models before they are actually adopted.

[0003] As described above, when an experiment is always carried out in full size, it is good to end with one experiment, but when many experiments are to be performed parametrically by changing the amount of reinforcing steel and the strength of concrete, the experiment must be carried out. It takes enormous cost and labor to finish.

Therefore, the size of the structure is reduced to 1/20 or 1/20.
If a scale model experiment can be performed at 10 or the like, cost and labor can be minimized, and thus many experiments can be performed, so that it is possible to develop an optimal structure type.

[0005] Regarding the above-mentioned scale model test, it is known that a model test is performed using a 1/20 rebar framework, and a vibration test is actually performed using a 1/20 building model. The example which performed is also announced.

When a vibration test is performed using a 1/20 building model, extra-fine, for example, deformed reinforcing bars having a diameter of 1 mm or 2 mm are manufactured so as to be as close as possible to actual reinforcing bars. As shown in FIG. 2, the production of the extra fine deformed reinforcing bar is performed by cold rolling a predetermined material, for example, a wire 21 through a roller die 22 formed into the shape of the deformed reinforcing bar to obtain an extra fine deformed reinforcing bar 23. I have.

[0007]

However, by manufacturing as described above, it is possible to manufacture a large amount of extraordinarily deformed rebar for scale model experiments, but equipment costs for manufacturing roller dies and the like become extremely high. . That is, the roller die processed into the shape of the deformed reinforcing bar described above is manufactured by photoengraving a mold having the shape of the deformed reinforcing bar, and the mold is applied to the roller, and then the roller corresponding to the convex portion forming portion of the material is corroded. ,
Since it is manufactured by a method such as quenching the roller,
It requires very precise and advanced technology and a great deal of cost,
This is because it cannot be easily manufactured.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a method capable of easily producing an ultrafine deformed reinforcing bar at low cost.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, a method of manufacturing an ultrafine deformed rebar according to the present invention comprises forming a hole having substantially the same diameter as a valley to be obtained in a steel plate, and forming the hole. A plurality of upper dies and lower dies prepared by dividing into two at the diameter position are arranged at a predetermined interval, and the material is pressed by the upper and lower dies in a holding state. By doing so, it is possible to obtain a superfine deformed reinforcing bar easily and at low cost.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The method for manufacturing an ultrafine deformed reinforcing bar according to the present invention is a method for manufacturing a deformed reinforcing bar having a small diameter, wherein a hole having substantially the same diameter as a valley to be obtained is formed in a steel sheet. A plurality of upper dies and lower dies formed by dividing the steel plate into two at the positions of the diameters of the holes formed in the steel plate are arranged at predetermined intervals, and the upper and lower dies narrow the material to be sent. Pressing in a holding shape to obtain a deformed shape.

In the above-mentioned method, in order to form a material, for example, a wire into a deformed rebar shape, an upper mold and a lower mold are formed from a steel plate, and the upper mold and the lower mold are pressed with a wire interposed therebetween. ing. For creating upper and lower molds,
A hole is formed in one steel plate, and the steel plate is divided into two at the diameter position of the hole to obtain an upper die and a lower die. Next, a plurality of upper and lower dies are prepared, and for example, a spacer is arranged between the upper dies and between the lower dies.

When the upper and lower molds are pressed from above and below with the wire interposed therebetween, the wires are crushed by the upper and lower molds to form troughs of deformed reinforcing bars.
On the other hand, the wire corresponding to the spacer arrangement position is not crushed, and the crushed and raised portion moves in the longitudinal direction to form a peak. Thus, an irregular shape is formed on the wire. By doing so, a very fine deformed reinforcing bar can be obtained simply and at low cost.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a superfine deformed reinforcing bar of the present invention will be described with reference to FIG. First, a rectangular steel plate 1 having a thickness close to the interval between the nodes of the deformed reinforcing bar pattern was prepared.
Then, a hole 1a is formed by a laser cutting machine (not shown) as shown in FIG.

Thereafter, as shown in FIG. 1B, the steel sheet 1 is divided into two parts at the diameter position of the hole 1a, and the cut portions are quenched to form the hole mold 2 (upper mold) and the hole mold 3 (lower mold). To manufacture. And
The spacers 4 shown in FIG. 1B having a thickness corresponding to the width pitch of the peaks of the deformed reinforcing bars are arranged between the molds 2 and between the molds 3 as shown in FIG. 1C. Is fixed with an upper outer frame 5 and a lower outer frame 6.

Next, a wire 1 is inserted between the molds 2 and 3 between the press bodies 7 and 8 fixed by the upper outer frame 5 and the lower outer frame 6, respectively.
As shown in FIG. 1 (d), by pressing vertically, as shown in FIG. 1 (d), the portions of the molds 2 and 3 are crushed as shown in FIG. 1 (e) to form valleys 10a, The portion of the spacer 4 is not crushed but rises to form a crest 10b, and a gap 10c formed between the dies 2 and 3 in the axial direction.

After one press, the pressed state is released, the press bodies 7 and 8 are separated, the wire 10 is sent to the next location, and the press is performed again, so that the continuous wire 10 Can continuously produce deformed reinforcing bars.

As described above, according to the method for manufacturing an extra-fine deformed reinforcing bar of the present invention, the wire 10 is pressed by the press bodies 7, 8 in which a plurality of hole dies 2, 3 which can be easily formed are arranged. As described above, it is possible to easily and at low cost obtain an extra-fine deformed reinforcing bar without using expensive rollers.

In the method for manufacturing an extra-fine deformed reinforcing bar according to this embodiment, a case is shown in which the holes 2 and 3 are vertically opposed to each other so that the crests 10b of the completed deformed reinforcing bar coincide with each other in the circumferential direction. If the upper and lower parts 2 and 3 are alternately arranged, the crests 10b of the completed deformed reinforcing bars can be alternately formed in the circumferential direction. Furthermore, if the thickness of the steel plate 1 and the thickness of the spacer 4 are changed, various patterns of irregular shapes can be arbitrarily changed.

[0019]

As described above, according to the method for producing an ultrafine deformed reinforcing bar of the present invention, a hole having a diameter substantially equal to the diameter of the valley of the deformed reinforcing bar is formed in a steel plate, and the hole is divided into two at the diameter position of the hole. A plurality of upper and lower molds are arranged at a predetermined interval, and deformed rebar is manufactured by pressing the material with these upper and lower molds. It is possible to obtain an extra-fine deformed reinforcing bar at low cost, and it is not necessary to manufacture a special roller die, and the shape of the deformed reinforcing bar can be arbitrarily changed only by changing the upper die and the lower die.

[Brief description of the drawings]

1 (a) to 1 (e) are diagrams showing a procedure for manufacturing an extra fine deformed reinforcing bar by the method for producing an extra fine deformed reinforcing bar of the present invention.

FIG. 2 is a view showing a part of a conventional apparatus for manufacturing extra-fine deformed reinforcing bars.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 1a hole 2 hole type (upper type) 3 hole type (lower type) 4 Spacer 5 upper outer frame 6 lower outer frame 7 press body 8 press body 10 Wire (material)

Continued on the front page (51) Int.Cl. ⁶ Identification code FI G09B 25/04 G09B 25/04

Claims (1)

[Claims] 1. A method of manufacturing a deformed reinforcing bar having a small diameter, comprising forming a hole having substantially the same diameter as a diameter of a valley to be obtained in a steel sheet, and forming the steel sheet at a diameter position of the hole formed in the steel sheet. A plurality of upper dies and lower dies created by dividing into two parts are arranged at predetermined intervals, and the upper and lower dies are used to press the conveyed material in a holding shape to obtain a deformed shape. Characteristic method of manufacturing extra-fine deformed rebar.