JP3269022B2 - Method for removing twist from coiled deformed wire wound by laying winder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing torsion from a coiled deformed wire wound by a laying winder, and more particularly, to winding a rolled deformed wire by a laying winding method. A method for removing the torsion of the deformed wire itself generated in the entry pipe located on the upstream side of the laying pipe when performing a bending process for manufacturing a secondary processing material for building from the coil which has been manufactured. Things.

[0002]

2. Description of the Related Art In a concrete structure, a deformed member having a deformed cross section is used as a reinforcing bar in order to enhance the adhesion to concrete. For example, after arranging a large number of vertical streaks on a column or the like, a deformed wire is also used as a hoop streak as a horizontal streak arranged so as to form a multi-step shape with a pitch of about 100 mm so as to surround a main streak located on the outer periphery thereof. . The hoop streak is obtained by sequentially bending a wire and bending it into a rectangular or circular frame, and the thickness is appropriately selected from those having a diameter of usually about 5.5 mm to 16 mm depending on the size of the pillar. Is done.

[0003] When a hoop streak is formed by bending a deformed wire at the construction site in accordance with the position and interval of a main bar, a long linear wire is used. In this case, efficiency is extremely low because bending work is required on site. Instead of this, if a hoop with a frame shape is brought in beforehand, the hoop can be bent at a well-equipped factory, and the ends can be welded by butt-welding in advance. Can also be raised.

[0004] When a hoop bar is manufactured at a factory, it can be continuously bent by an automatic bending machine. Therefore, a continuous material is used as a deformed wire introduced into the bending machine. On the other hand, long deformed wires are often wound to reduce the bulk during storage and the convenience of handling during transport after rolling.Therefore, deformed wires are rolled, cooled, and then wound. It is transported to the bending factory.

[0005] Conventionally, there are two methods of winding a wire flowing out of a rolling facility: a gauntlet winding method in which a wire is directly wound into a wire bundle, and a method of successively unwinding a wire to be introduced from a preceding winding portion while continuously winding the wire in a spiral shape. There is a laying type winding method. The former method has an advantage that the wire can be wound without giving a twist, but the productivity is significantly inferior to the latter due to the winding mechanism.

When the latter laying type winder is used, the productivity is high due to high speed convergence. However, the rolled wire guided to the winder is formed into a coil while rotating around the axis in the laying head. In the process of being formed, it is inevitably twisted. Therefore, even if the wire rod focused by the focusing device is stretched, there is a disadvantage that the twist remains, which is not negligible as a material for building civil engineering.

Here, the procedure of winding by the laying head device will be briefly described with reference to the drawings. The steel material taken out of the heating furnace passes through a rough roll rolling mill and an intermediate roll rolling mill and passes through a finishing roll rolling mill, for example, to 5.5 m.
It is rolled into a wire having a diameter of m to 16 mm. The wire is water-cooled in the cooling zone, reheated in the recuperating zone near the side dimension machine, and then cooled again in the cooling zone. The pinch roll device 21 shown in FIG. Sent to

[0008] The wire rod 1 of 850 ° C to 900 ° C sent out from the outlet pipe 22 provided on the downstream side of the pinch roll device
Is transferred to the laying head device 23 which is only 24 mm apart, for example. The laying head device includes an induction machine 24 and a winder 25. The induction machine includes a hollow pipe 27 shown in FIG. 7 along a pass line 26a and an entry pipe shown in FIG. 28. On the other hand, the winding machine 25 is provided with a spiral laying pipe 29 for spirally winding the wire 1 as shown in FIG. 7, facing the downstream opening of the entry pipe.

The entry pipe 28 (see FIG. 8) guides the wire 1 passing at a high speed of, for example, 85 m / sec.
After passing through the laying pipe 29 (see FIG. 7). After being formed into a spiral shape by the laying pipe, it becomes a continuous coil shape having a diameter of about 1,300 mm from the downstream side opening, but is superimposed sideways on the stealmore conveyor 30 and conveyed toward the focusing portion. . When the wire rods exit the stealmore conveyor, they are placed in a horizontal position by a down ender (not shown), carried out to a predetermined position by a hanger conveyor, and thereafter subjected to processing such as binding and weighing before being shipped.

In FIG. 6, a pinch roll device 21 is provided.
The trough located on the upstream side comprises an entrance trough 31 and an exit trough 32, and the latter is inclined downward, for example, by 7.5 degrees with respect to the entrance trough 31 arranged along the horizontal pass line 26b. The outlet side is connected to the introduction pipe 33 of the pinch roll device. Pass line 26a after trough
Is inclined because the laying pipe 2 of the winder 25
The reason is that the wire rod 1 discharged from the pipe 9 can be moved forward and horizontally by its own weight on the upper surface of the stermore conveyor.

In the above winding step, the outlet pipe 2
2 guides the wire drawn from the pinch roll, while maintaining or restoring a certain degree of straightness of the wire 1 while passing through the pinch roll, so that the wire can be smoothly introduced into the entry pipe of the laying head device. Has become.
The entry pipe has an idle rotation structure, and the laying pipe has an integral rotation structure through the hollow tube 27 and the rotating shaft 34 (see FIG. 7).
When the laying pipe is supported by the rotating shaft and rotates with the rotating shaft to discharge the wire 1 in a spiral shape, when the rotation is clockwise as seen from the downstream side as indicated by an arrow 35, the inside of the entry pipe 28 In this case, while the wire 1 is waving as shown by a thick imaginary line, a left-handed twist is naturally given as indicated by an arrow 36 in the opposite direction.

When secondary processing such as manufacturing the above-mentioned hoop streaks from the spirally shaped wire (BIC: burn-in coil) 1 in this manner, as shown in FIG. It is pulled out by the device 4 and the bending is corrected by the straightening machine 5. In this case, the coil 2 of the wire rod wound in a coil shape is passed through a plurality of guide bars 37 erected on a supplier and turned on a rotary table 38.
It is placed vertically on top and pulled out tangentially via guide rollers 39.

However, since the wire itself is already twisted in the entry pipe 28 as described above, the wire is pulled out by the pinch roll device 4 while keeping the twist, and the bending roll 9 of the bending machine 6 is bent. The twist remains even when it reaches. The surface of the deformed wire 1 has not only ribs 8 as shown in FIG. 10 but also crosses or slants as shown in FIG. In any case, even if the pattern is given regularly, it is not a constant axially symmetrical shape in the longitudinal direction, and the contact state with the bending roll is caused by the twist remaining in the wire introduced into the bending roll 9. Will change from moment to moment according to the flow.

That is, the node 1a of the deformed wire may come into contact with the bending roll, or may come into contact with a portion having a small diameter without a rib. Further, depending on the position of the rib, a portion where the rigidity of the bent portion is high or low is generated. For example, a rectangular hoop streak 1 as shown in FIG.
In the case of forming 0, if a rib is placed on a pair of opposing bending rolls 9, the position of the bent portion may be slightly shifted by slipping from the rolls to avoid the bending force, and a desired bending angle may not be obtained. Or

The arrangement of the bending rolls 9 is as shown in FIG. 12, of which the outer pressing roll 9a is rotatably supported at the middle or at the tip of an arm 9c which rotates about the axis of the inner pressing roll 9b. By the almost constant bending force determined according to the diameter, the posture shown in FIG.
Since it is rotated to the posture of FIG. 2A, it is difficult to give a desired constant bending angle even if the rigidity of the bending portion is high or low. In addition, although the twist is one rotation per 3.5 m to 4 m of the wire, for example, the bending position of the hoop streak does not come at every one rotation of the twist and also coincides with the rib forming pitch. Therefore, it is almost impossible to adjust so that the same cross section reaches the bending roll in consideration of the above.

In particular, when the hoop streak 10A has a circular shape as shown in FIG. 12 (b), all the portions are slightly bent, so that the bending angles are not uniform at each time. As a result, the same angle is obtained. It is difficult to obtain a ring shape having a radius of curvature. Hoop streaks of any shape such as rectangles do not become the desired exact rectangles or circles, and if expressed in extreme terms, the desired 90 ° bend is shifted from that, as shown in FIG. A hoop streak slightly distorted in the shape of a rhombus or an ellipse even if it is desired to form a circle.

If there is such a variation, distortion remains even after welding in a later step, and it becomes difficult to fit the main reinforcement at a construction site, and the product is not satisfactory. Most severely, due to the synergistic action of the bending deformation generated by the bending roll during bending and the torsional strain remaining in the wire, the wire bends in a direction other than desired, as shown in FIGS. 13 (b) and 13 (c). The flatness of the hoop streak 10 is impaired, and the ends of the closed shape are staggered, which results in the difficulty of the subsequent butt butt welding operation.

[0018]

Therefore, when secondary processing of a deformed wire by the laying-type winding method, an operator is bothersomely arranged in an automatic bending machine so that an unsatisfactory hoop streak can be found. At the same time, it was necessary to rework them, and at the same time, they had to increase labor costs and labor. In order to solve this problem, various ideas have been devised for the deformed shape in order to improve the quality at the time of bending, despite the deformed wire rod, and the flatness error δ of the hoop streak (see FIG. 1).
(See (b) and (c) of FIG. 3) within the tolerance of voluntarily determined plane distortion of, for example, 5 mm or less.

By the way, as described in Japanese Patent No. 2,659,071, a twist in the opposite direction is given in advance before the rolled wire is introduced into the entry pipe, and the twist is caused by the laying pipe. Some things are offsetting. However, a device for that purpose is required on the induction machine side, and the equipment becomes large. In addition, since the degree of twist varies depending on the winding diameter in the laying pipe, the reverse twist given in advance must be changed to various types, and the mechanism becomes complicated. There are difficulties.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to produce a bent material as a building material such as a hoop from a coil wound by a laying winding method at a factory. In addition, the distortion is small, the variation in the shape is extremely small, and the welding operation for joining the both ends with a desired accuracy can be facilitated, and the desired joining strength can be expressed, thereby. When brought to the construction site, it can be easily dropped around the vertical streak group, it can fully demonstrate the function as a horizontal streak, smooth work, and introduce special or large-scale equipment in the bending process Of course, it is possible to remove the torsion of the deformed wire prior to bending by a laying type winder. To provide a taken twisted removal method from coiled profiled wire.

[0021]

SUMMARY OF THE INVENTION The present invention relates to a method of bending a hoop wire or the like for surrounding a main bar such as a concrete column from a coil obtained by winding a deformed wire rod after rolling and cooling by a laying-type winding method. It is applied to a method of removing the twist of the deformed wire itself generated in the entry pipe located on the upstream side of the laying pipe when forming a workpiece. The feature is that, with reference to FIG. 1, a coil 2 for introducing a deformed wire 1 into a bending machine 6 (see FIG. 4).
When drawing out from the coil, the deformed wire is pulled out in the direction of the axis 2a of the coil or in a direction within ± 20 degrees with respect to the axis of the coil. That is, the terminal portion 2b is fixed so as not to induce rotation of the coil.

[0022]

[0023]

According to the present invention, when the wire is fed out from the coil of the deformed wire into the bending machine, the wire is drawn in the axial direction of the coil or in a direction within ± 20 degrees with respect to the axis of the coil. As a result, the twist generated in the wire by the unwinding cancels the twist generated in the laying-type winding, and a wire having no twist can be introduced into the bending machine. Therefore, even if the deformed wire rod wound by the high-speed laying head device is bent to make it a secondary material for architectural civil engineering such as hoop streaks, irregularities in the deformation at each bent portion are minimized. It is possible to manufacture a material having high flatness, easy end butt welding, and exhibiting desired strength. There is no need to introduce a special device or perform a special operation for removing the twist, and it is possible to reduce the cost of the processing material.

[0024] Since any part except the part of the deformed wire drawn from the coil or the terminal part is fixed so as not to induce the rotation of the coil, the coil shape is less disturbed when the wire is fed out, and the support of the coil is small. The generation of unnecessary force acting on the structure can be avoided.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for removing twist from a coil-shaped deformed wire wound by a laying type winder according to the present invention will be described with reference to the drawings showing an apparatus suitable for carrying out the method. This will be described in detail. FIG. 1 shows a schematic configuration for carrying out the present method.
Is supported so that its axis 2a is substantially horizontal,
When the deformed wire 1 is unwound from the coil 2 to be introduced into the bending machine, the deformed wire 1 is drawn in the direction of the axis of the coil.

More specifically, as a bending equipment including a mechanism for removing the torsion of the deformed wire, as shown in FIG. 4, a hanger device 3 for suspending the bundled coils 2 of the deformed wire 1 in a horizontal position. A pinch roll device 4 for drawing out the wire rod; a straightening machine 5 for straightening the bent of the fed wire rod; and an automatic bending machine 6 for bending the wire rod into a desired shape as a material for building civil engineering such as hoop streaks. I have.

The hanger device 3 has a horizontally extending support arm 3b fixed to a hanger base 3a, and the coil 2 passed through the support arm 3b is suspended with its axis 2a horizontal. Note that the wire 1 maintains a suspended state without moving on the support arm 3b due to the weight of the coil 2, but a guide roll device 7 for guiding the feeding of the wire is disposed at an appropriate position.

The pinch roll device 4 is installed horizontally so that the wire 1 is drawn out in the direction of the axis 2a of the coil 2, but the position may be set to be coincident with or parallel to the axis 2a. In any case, it suffices if it is at an appropriate height position where it can be easily extended from the coil 2. The general configuration and functions of the automatic bending machine 6 have been described in the section of the prior art, and will not be described here.

With the arrangement of the respective devices, twisting is given when the wire 1 is pulled out by the pinch roll device 4, thereby canceling the twist generated in the entry pipe of the laying head device. become. Such a method is based on the following findings.

In general, when a wire is wound in a coil shape, if the wire is wound in a free state, for example, around a core material having a round cross section, a coil can be formed without giving a twist to the wire. When the coil is pulled in the tangential direction and unraveled, the wire can be unwound without twisting. On the other hand, when the coil is pulled in the axial direction and unraveled, a twist of one turn of the coil occurs in the wire itself in the same direction as the rotation.

By the way, the coil formed by winding the deformed wire rod after being rolled and cooled by the laying-type winding method is twisted in a direction opposite to the winding direction. This is because the upstream side of the wire is not substantially free when it is wound by the laying head device. Therefore, the coiled wire rod has a length of one rotation of the coil and a length of three turns in the direction opposite to the rotation of the coil.
There is a 60 degree twist.

If the diameter of the coil wound by the laying type winding method is 1,300 mm, the circumferential length is 1,300 × π = 4,082 mm, which is theoretically about 4 m.
Each rotation will give one twist. When the torsion at 16 m of a wire having a nominal diameter of 10 mm wound on a coil of 1,300 mm in diameter by a laying head device was examined, as can be seen from the white square measurement point in FIG. The linear distribution of torsion occurs.

On the other hand, as described above, when a coil having no twist is extended in the axial direction, the coil is twisted by the number of rotations of the wire, as described above. Fortunately, the wire of the coil wound by the laying-type winding method is used. The given twist is in the opposite direction. Therefore, if operated as in the present invention,
It can be seen that in theory the initially applied torsion is completely canceled by the torsion that occurs later. As a result, when the presence or absence of the twist of the wire rod from which the twist has been removed is measured, the twist is almost completely eliminated as shown by the white circle measurement point in FIG.

On the surface of the deformed wire 1, not only the ribs 8 are provided as described with reference to FIG. 10, but also they cross each other or are inclined as shown in the figure. Accordingly, since the wire does not have an axially symmetrical cross section, the contact state between the wire introduced into the automatic bending machine 6 and the bending roll 9 sometimes does not have a twist according to the present invention depending on the flow of the wire. It will change every moment. When twisting is involved, the wire is bent in an undesired direction due to the synergistic action of the bending deformation generated by the bending roll at the time of bending and the torsional strain remaining in the wire, but the twist was caused by the twist. Unnecessary deformation is avoided, and the flatness of the hoop streaks 10 is not impaired as shown in FIGS. 13B and 13C, and the plane distortion can be kept within about 2 mm.

Therefore, no misalignment occurs at positions where both ends face each other in order to make the hoop streak a closed shape, and the workability and welding quality in the subsequent butt butt welding are improved. The bulge of the upset butt welded portion 10a results in welding without offset as shown in FIG. 3A, or the offset ε as shown in FIG.
Occurs within the allowable range as much as possible. Also,
Even if a slight angle error occurs in the bent portion, it does not become severe as shown in FIG.

As can be seen from the above description, according to the method of the present invention, the twist generated by the laying type winding method can be removed before being introduced into the automatic bending machine.
Therefore, there is no need to employ a gauntlet winding method in which twisting does not occur but the winding speed is low. The number of defective products is reduced as much as possible, and it is not necessary to arrange workers on the automatic bending machine or to perform rework by the workers. Furthermore, it is not necessary to select the surface shape and cross-sectional shape of the deformed wire in consideration of bending work, and it is only necessary to consider the adhesiveness when casting concrete and the formability of rolls during rolling. Therefore, the degree of freedom in designing a deformed wire can be increased.

Such a method can be realized with a simple structure without introducing a special device, and the twist can be theoretically completely removed. Hoop streaks are less distorted during bending and there is very little variation in shape and welding quality, and hoop streaks can be easily dropped from above vertical streaks, providing extremely satisfactory products. Is done.

Meanwhile, in FIG. 4, the number of remaining turns of the coil decreases while the deformed wire 1 is pulled out from the coil 2. When the number of windings on the hanger device 3 is extremely small, the standing state on the support arm 3b changes due to the weight of the wire. If the coil 2 rotates at the support arm every time the wire is pulled out, the amount of torsion for canceling out is reduced. In consideration of such circumstances, it is preferable that the terminal portion 2b of the coil 2 of the supported deformed wire 1 is fixed by, for example, hooking on a hanger base 3a.

Alternatively, a pusher (not shown) that can gradually retreat in the direction of the hanger base 3a in accordance with the pulling speed can be provided above the support arm 3b. This allows the coil to be restrained by pressing the upper surface of the unextracted portion of the coil against the support arm. As will be understood from this, it is sufficient to fix any part or the terminal part other than the part of the deformed wire pulled out from the coil so as not to induce the rotation of the coil.

In the example of the above-mentioned twist removing device, the wire 1 is drawn out in the axial direction of the coil 2 by the pinch roll device 4, but the support arm 3b on the hanger device 3 is moved upward, for example, as shown in FIG. The wire 1 may be inclined horizontally by 20 degrees. However, when the angle exceeds 20 degrees, a change occurs in the twist distribution for canceling generated during the drawing, or the remaining coil in the suspended state is tied up, which makes the drawing difficult. Unnecessary force is also applied to the support arm, and excessive rigidity is required for the device, which is not preferable.

The support arm may be inclined downward by 20 degrees. Alternatively, the support arm may be kept horizontal, and the direction in which the wire is pulled out may be inclined upward or downward up to 20 degrees. When the support arm is set in the vertical position, the wire may be pulled out upward, and then the wire may be flowed so as to travel horizontally toward the automatic bending machine 6. In any case, when the deformed wire is unreeled from the coil, the wire is drawn in the axial direction of the coil or in a direction within ± 20 degrees with respect to the axis of the coil. What is necessary is just to cancel out torsion.

In the above description, the case of manufacturing a hoop streak has been described. However, the present invention is not limited to building civil engineering materials, but takes out a wire from a coil wound by a laying-type winding method and bends the wire. Needless to say, the present invention can be applied to the case of producing secondary products.

[Brief description of the drawings]

FIG. 1 is a schematic system diagram of an apparatus for performing a method for removing twist from a coil-shaped deformed wire wound by a laying type winder according to the present invention.

FIG. 2 is a graph showing a distribution example of a twist generated in a wire in a longitudinal direction by a laying-type winding method and a measurement example of a twist distribution after the twist is removed by the present invention.

FIGS. 3A and 3B show a joining state of both ends of a hoop bar subjected to butt butt welding, in which (a) is a partial view without an offset, and (b) is a partial view in a case where a small offset remains.

FIG. 4 is an overall view of a bending equipment showing a specific example of an apparatus for performing the method.

FIG. 5 is an overall view of a bending equipment showing a specific example of the device when the posture of the coil is inclined.

FIG. 6 is an overall external view of a laying winder.

FIG. 7 is an internal configuration diagram of a winder portion of the laying winder.

FIG. 8 is a cross-sectional view showing only an entry pipe installed inside an induction machine of the laying winder.

FIG. 9 is an overall view of a conventional bending equipment.

FIG. 10 is a partial view showing irregularities and patterns by ribs and the like provided on the surface of the deformed wire.

FIG. 11 is a perspective view showing a state in which a rectangular hoop is manufactured by a bending roll in a bending machine;

12A is an enlarged perspective view of a bending roll portion, FIG.
(B) is a perspective view of a bending roll in a state where a circular hoop is being manufactured.

FIG. 13A is a plan view showing an example of a rectangular hoop streak whose appearance has become undesired, and FIGS.
FIG. 4 is a side view of a hoop streak showing a state in which flatness of a bent hoop streak is impaired due to twisting of the deformed wire rod and a plane strain of δ occurs.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Deformed wire rod, 2 ... Coil, 10 ... Hoop bar, 6 ... Bending machine (automatic bending machine), 2a ... Axis line, 2b ... Termination part.

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification code FI B65H 54/82 B65H 54/82 (72) Inventor Toshifumi Ide 1-1-2 Nishijima, Nishiyodogawa-ku, Osaka-shi, Osaka Japan Joint Steel (56) References JP-A-3-180234 (JP, A) JP-A-56-23169 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21C 47 / 22 B21C 47/18 B21C 47/20

Claims (1)

(57) [Claims] When forming a bent product such as a hoop bar for surrounding a main bar such as a concrete column from a coil obtained by winding a deformed wire rod after rolling and cooling by a laying type winding method, In a method for removing the twist of the deformed wire itself generated in the entry pipe located on the upstream side of the laying pipe, when the deformed wire is unreeled from a coil to be introduced into a bending machine, the deformed wire is moved in the axial direction of the coil. Alternatively, the coil is pulled out in a direction within ± 20 degrees with respect to the axis of the coil, and at that time, any part except for the part of the deformed wire drawn out from the coil or the terminal part is fixed, and the rotation of the coil is not induced. In this way, the deformed wire itself is twisted to offset the twist generated in the entry pipe. A method for removing torsion from a coil-shaped deformed wire wound by a winding type winder.