JP6760484B2 - Bar wire straightening machine and bar wire straightening method - Google Patents

Description

The present invention relates to a bar wire straightening machine and a bar wire straightening method.

The metal wire is generally manufactured in a long length and wound into a coil. The wire wound into a coil is then unwound and used in a processing process. The unwound wire is curved due to the habit of winding it into a coil, so it is necessary to correct this to make it straight. A multi-roller straightening method is generally used for straightening metal wires.

Patent Document 1 discloses a method for producing a steel bar in which a wire rod is cold-straightened by a pinch roll and a plurality of straightening rollers.

Patent Document 2 includes at least two sets of rollers composed of a plurality of straightening rollers, and linearly straightens the metal wire using a straightening machine that corrects the bending of the metal wire by passing the metal wire through the roller group. The method is disclosed.

Japanese Unexamined Patent Publication No. 2011-025308 Japanese Unexamined Patent Publication No. 2015-174090

In straightening the bar wire, it is necessary to adjust the pushing amount according to the tension applied to the bar wire. In an actual machine, it is not easy to find the optimum solution, and a great deal of labor is required. Further, with a widely used simple straightening machine, the pushing amount for each roll cannot be adjusted. Only the roll gaps at the entry side end and the exit side end can be set, and the push-in amount of the intermediate roll is the push-in amount in which the entry-side push-in amount and the exit-side push-in amount are proportionally distributed at the intermediate roll position. It becomes. Therefore, the adjustment of the pushing amount is limited, and it is difficult to obtain the optimum conditions.

An object of the present invention is to provide a bar wire straightening machine for easily improving the straightness of a bar wire even in a simple straightening machine, and a method for straightening the bar wire.

The present inventors have diligently studied the structure of a bar and wire straightening machine that can easily improve the straightness of the bar and wire. As a result, it was found that the straightness can be improved by performing the correction in which the correction directions are substantially the same in two steps.

The present invention has been further studied based on the above findings, and the gist thereof is as follows.

(1) A straightening machine that corrects by passing a metal rod and wire between a plurality of rolls, the straightening machine includes two or more adjacent units, and the above-mentioned two or more units. It includes at least one set of units having an angle of ± 15 ° in the direction of straightening the bar and wire, and the unit has two or more fixed rolls and one less movable roll than the fixed rolls. The fixed roll and the movable roll are a fixed roll arranged on one side of the running rod wire and a movable roll arranged on the opposite side of the fixed roll with respect to the rod wire. Each roll is arranged in a staggered manner so as to sandwich it, and the pushing amount of the movable roll on the most inlet side and the movable roll on the most exit side of the unit can be set. In the above unit group, the jth unit from the bar wire entry side. When the number of movable rolls is n (j) and the amount of pushing of the i-th movable roll in the direction of the rod wire from the rod wire entry side of the jth unit is ΔY (j, i), ΔY (j, 1). )> ΔY (j, 2)>...> ΔY (j, n (j)), and when j ≧ 2, ΔY (j, 1)> ΔY (j-1, n (j-1)), And 0.8 ≤ ΔY (j, 1) / ΔY (j-1, 1) ≤ 1
A bar and wire straightening machine characterized by being.

(2) The bar wire straightening machine according to (1), wherein the direction of straightening the bar wire of two or more units included in the unit group is within ± 15 °.

(3) A method for straightening a bar wire using the straightening machine according to (1) or (2) above, which is the jth method from the bar wire entry side in a unit having the same straightening direction. When the number of movable rolls of the unit is n (j) and the pushing amount of the i-th movable roll in the direction of the rod wire from the rod wire entry side of the jth unit is ΔY (j, i), ΔY (j, i). 1)> ΔY (j, 2)>...> ΔY (j, n (j)), and when j ≧ 2, ΔY (j, 1)> ΔY (j-1, n (j-1)) And 0.8 ≤ ΔY (j, 1) / ΔY (j-1, 1) ≤ 1
A method of straightening a bar wire, which is characterized by the fact that.

According to the present invention, a bar with high straightness can be easily obtained.

It is a figure which shows an example of the Embodiment of this invention. It is a figure which shows the straightening direction of a bar wire rod. It is a figure which shows another example of embodiment of this invention. It is a figure which shows the arrangement of the roll in an Example. It is a figure which shows the side surface shape of the roll in an Example.

Hereinafter, the present invention will be described in detail.

The bar wire straightening machine of the present invention is characterized by including at least one set of a unit group including a plurality of rolls and two or more units having substantially the same direction for straightening the bar wire.

Each unit has a plurality of fixed rolls and movable rolls. The number of rolls is not particularly limited, but in a bar wire straightening machine, it is common to arrange the rolls in a staggered manner so that the bar wire is sandwiched between a fixed roll and a movable roll that is one less than the fixed roll. Yes, the straightening machine unit of the present invention also has rolls arranged in that way. Straightening of the bar wire is performed by pressing a movable roll against the bar wire.

The simplest embodiment is, for example, the embodiment shown in FIG. The straightening machine of FIG. 1 has a unit group including two units 11a and 11b, and each unit includes three fixed rolls 12 and two movable rolls 13. The fixed roll 12 and the movable roll 13 are arranged in a staggered manner so as to sandwich the traveling rod wire material 14, and the rod wire material 14 is straightened by pressing the movable roll 13 against the traveling rod wire material 14.

The pushing amount of the movable roll on the exit side in the unit is smaller than the pushing amount of the movable roll on the entering side. Further, the pushing amount of the movable roll on the entrance side of the unit 11b is larger than the pushing amount of the movable roll on the exit side of the unit 11a. The correction directions of the adjacent units 11a and 11b are substantially the same. Approximately the same correction direction means that the angle formed by the correction direction is within ± 15 °. The angle formed by the correction direction is preferably ± 5 °, and more preferably the same.

FIG. 2 shows an outline of the correction direction. In FIG. 2A, the bar wire 21 travels from the front to the back in the direction perpendicular to the paper surface. If the angle θ formed by the correction direction 22a of the unit on the front side in the traveling direction and the correction direction 22b of the unit on the back side in the traveling direction adjacent to the correction direction 22a is within ± 15 °, it is determined that they are substantially the same.

The plane including the straightening direction 22a and the straightening direction 22b does not have to be perpendicular to the traveling direction of the bar wire, but the deviation from the vertical is preferably within ± 15 °, more preferably within ± 5 °, and is vertical. Most preferably.

The "angle formed by the correction direction" shall indicate the acute-angled side. That is, the straightening direction may be opposite to the bar wire to be straightened (within ± 15 ° from the direction of 180 °), but it is preferably the same direction with respect to the bar wire. The angle formed by the correction direction is more preferably within ± 5 °, and further preferably 0 ° (the correction direction is the same). FIG. 2B shows an example in which the straightening direction is within ± 15 ° and the direction is opposite to that of the bar wire.

As described above, the straightness of the bar and wire can be improved by using the unit group in which the units in which the straightening directions of the bar and wire are substantially the same are arranged side by side. The details of the effect will be described later with reference to Examples.

Generally, in the straightening of a wire rod, it is known that the wire rod can be effectively straightened by reducing the pushing amount of the roll from the entry side to the exit side of the wire rod. Also in the present invention, it is preferable that the amount of the movable roll pushed into the bar wire in the same unit is monotonically changed so that the inlet side is the largest and the outlet side is the smallest. That is, when there are n movable rolls and the pushing amount of the i-th movable roll from the entry side in the bar wire direction is ΔY (i), ΔY (1)> ΔY (2) >> ...> ΔY (n). ).

In a straightening machine having a plurality of movable rolls like the unit of the present invention, it is usually possible to set the pushing amount of the movable roll on the most inlet side and the movable roll on the most outlet side. The unit of the present invention also needs to be able to set at least the pushing amount of the movable roll on the inlet side and the movable roll on the most outlet side. In that case, if ΔY (1)> ΔY (n) is set as in the case of a normal straightening machine, the pushing amount of the movable roll between them changes linearly. Of course, the pushing amount may be set so that ΔY (1)> ΔY (2)> ...> ΔY (n) by using a unit capable of setting the pushing amount of all the movable rolls.

Further, in the unit group, the pushing amount of the movable roll on the entrance side of the unit on the exit side is larger than the pushing amount of the movable roll on the exit side of the unit on the exit side. That is, in the unit group, the pushing amount of the movable roll on the exit side of the first unit on the entry side is ΔY (1, n), and the pushing amount of the movable roll on the entry side of the second unit is ΔY (2,1). Then, ΔY (2,1)> ΔY (1, n).

Further, the pushing amount ΔY (1,1) of the movable roll on the entering side of the first unit on the entering side and the pushing amount ΔY (2,1) of the movable roll on the entering side of the second unit are 0.8 ≦. Make sure that ΔY (2, 1) / ΔY (1, 1) ≦ 1. As a result, the effect of arranging the units for straightening the rods and wires in the same direction side by side can be effectively obtained. Even in a unit group including three or more units, the pushing amount is set in the same manner for adjacent units.

The detailed mechanism by which the straightness is improved when units having the same straightening direction are arranged next to each other is unknown, but it is considered that the rotation of the bar wire during straightening is effective.

The configuration of each unit included in the unit group does not have to be the same as long as the direction of straightening the bar wire is the same. For example, the entry side unit may be a unit having four fixed rolls and three movable rolls, and the exit side unit may be a unit having three fixed rolls and two movable rotors.

The straightening machine may be provided with other rolls as long as it is provided with at least one set of units as described above. For example, a set of units having the same correction direction may be followed by a group of units having different correction directions. As shown in FIG. 3, a set of units for vertical correction may be provided after a set of units for horizontal correction. Further, pinch rolls for restraining the bar and wire may be provided before and after the set of units having the same straightening direction.

A steel wire having a diameter of 5.4 mm was straightened using the four types of rolls shown in FIG. 4, and the straightness was evaluated by the radius of curvature of the straightened wire. The distance between the fixed roll adjacent to the fixed roll and the distance between the movable roll adjacent to the movable roll was 78 mm, the diameter of the body of the roll was 38 mm, and the shape of the side surface of the roll was a V shape with an angle of 113 °. (Fig. 5).

The straightness was evaluated for three levels when the tension applied to the wire during straightening was 0 MPa, 125 MPa, and 250 MPa.

In FIG. 4A, the upper three rolls are fixed rolls and the lower two rolls are movable rolls, and the amount of pushing of the movable rolls is 2 mm for the inlet roll and 1.5 mm for the outlet roll. did.

(B) is an example in which correction is performed using a unit group including two units in which (a) is used as a basic unit and the correction direction is reversed. (C) is an example in which correction is performed using a unit group including two units in which (a) is the basic unit and the correction direction is the same. (D) is an example in which 6 fixed rolls are arranged on the upper side and 5 movable rolls are arranged on the lower side, and the pushing amount of the movable rolls is 2 mm, 1.875 mm, 1.75 mm, 1 in order from the incoming roll. .625 mm and 1.5 mm. The results are shown in Table 1.

As shown in Table 1, when correction is performed using a unit group in which two units having the same correction direction are arranged side by side, the result is that the radius of curvature is large (good straightness), and the correction directions are the same. In addition, the result was that the radius of curvature was the largest (good straightness).

11a, 11b Unit 12 Fixed roll 13 Movable roll 14 Bar wire 21 Bar wire 22a Direction of travel Correcting direction of the unit on the front side 22b Direction of traveling Correcting direction of the unit on the back side

Claims (3)

It is a straightening machine that straightens by passing a metal rod and wire between multiple rolls.
The straightening machine includes two or more adjacent units, and includes at least one set of units in which the angle formed by the two or more units in the straightening direction of the bar wire is within ± 15 °.
The unit includes two or more fixed rolls and one less number of movable rolls than the fixed rolls, and the fixed rolls and the movable rolls are fixed arranged on one side of the traveling rod wire. Rolls and movable rolls arranged on the opposite side of the fixed roll with respect to the rod wire, and each roll is arranged in a staggered manner so as to sandwich the traveling rod wire, and the movable roll on the most inlet side and the most outlet side of the unit You can set the amount of pushing of the movable roll of
In the above unit group, the number of movable rolls of the j-th unit from the bar wire entry side is n (j), and the pushing amount of the i-th movable roll from the bar wire entry side of the j-th unit in the bar wire direction is ΔY. When (j, i)
ΔY (j, 1)> ΔY (j, 2)>...> ΔY (j, n (j))
And
When j ≧ 2,
ΔY (j, 1)> ΔY (j-1, n (j-1)) and 0.8 ≤ ΔY (j, 1) / ΔY (j-1, 1) ≤ 1
A bar and wire straightening machine characterized by being. The bar wire straightening machine according to claim 1, wherein the direction of straightening the bar wire of two or more units included in the unit group is within ± 15 °. A method for straightening a bar wire using the straightening machine according to claim 1 or 2.
In units with the same straightening direction, the number of movable rolls of the jth unit from the bar wire entry side is n (j), and the number of the i-th movable roll from the bar wire entry side of the jth unit is in the bar wire direction. When the pushing amount is ΔY (j, i),
ΔY (j, 1)> ΔY (j, 2)>...> ΔY (j, n (j))
And
When j ≧ 2,
ΔY (j, 1)> ΔY (j-1, n (j-1)) and 0.8 ≤ ΔY (j, 1) / ΔY (j-1, 1) ≤ 1
A method of straightening a bar wire, which is characterized by the fact that.

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