JP7347667B2 - Wire manufacturing method - Google Patents

Description

The present invention relates to a wire rod manufacturing method for manufacturing a wire rod by rolling a raw material.

When manufacturing a wire rod by rolling a material such as a billet made of steel, methods such as those described in Patent Documents 1 and 2 below are known, for example. Specifically, the wire rod is rolled by a rolling mill, and while being held between a pair of pinch rolls to maintain the tension, the wire rod is fed into a spiral guide tube of a rotating laying head, and then looped onto a conveyor. Send to. The wire rod is conveyed by a conveyor to a cylindrical focusing device, and is focused into a coil shape by the focusing device.

JP2004-074228A Japanese Patent Application Publication No. 2004-358515

When manufacturing wire rods as described above, the rotational drives of the rolling rolls, pinch rolls, and laying heads of a rolling mill are synchronized in order to run the wire rods under constant tension without loosening them. Furthermore, once the terminal end of the wire passes through the pinch rolls, the laying head needs to send out the wire using only the inertial force accompanying the running movement of the wire and its own rotational force. Furthermore, the rolling speed becomes slower as the size of the material becomes larger, that is, as the diameter of the wire rod to be manufactured becomes larger.

Therefore, if the diameter of the wire is large, that is, the rolling speed (travel speed) is slow and the circumferential speed of the laying head is slow, after the end of the wire passes through the pinch rolls, the entire wire is sent out from the guide tube of the laying head. In some cases, it remained in the guide tube without being removed.

Further, for example, if the rolling speed (travel speed) is increased due to the performance of the rolling mill, vibrations will occur, which may lead to a decrease in quality. For this reason, even when the rolling speed (travel speed) has to be slowed down, the above-mentioned problems occur.

Therefore, an object of the present invention is to provide a wire manufacturing method that can reliably send out all the wire from the guide tube of the laying head.

In order to solve the above-mentioned problems, the wire rod manufacturing method according to the present invention involves rolling a material into a wire rod, and inserting the wire rod into a spiral guide tube of a laying head that rotates at a rotation speed set according to the rolling speed. In the method for manufacturing a wire rod, in which the wire rod is wound into a coil shape by feeding and sending it out in a loop shape, when the wire rod is manufactured by rolling the material at a rolling speed lower than a reference speed, the terminal end of the wire rod is rolled. The invention is characterized in that the rotational speed of the laying head is increased to a rotational speed set according to the reference speed or more before the laying head enters the guide tube of the laying head.

In the wire rod manufacturing method according to the present invention, when manufacturing a wire rod by rolling a material at a rolling speed lower than a reference speed, before the terminal end of the wire enters a guide tube of a laying head, the rotation speed of the laying head is set as a reference speed. The rotation speed is increased so that it is equal to or higher than the set rotation speed according to the speed. This increases the inertial force of the wire and also increases the feeding force of the wire by the laying head, so that it is possible to reliably feed all the wire from the guide tube of the laying head without causing it to remain in the guide tube.

1 is a schematic configuration diagram of a main embodiment of a wire manufacturing apparatus that uses a wire manufacturing method according to an embodiment of the present invention.

Although embodiments of the wire manufacturing method according to the present invention will be described based on the drawings, the present invention is not limited only to the following embodiments described based on the drawings.

<Main embodiment>
A main embodiment of a wire manufacturing method according to an embodiment of the present invention will be described based on FIG.

As shown in FIG. 1, the wire rod manufacturing apparatus 100 includes a rolling mill 110 that rolls a material 1 such as a billet made of steel into a wire rod 2. As shown in FIG. The rolling mill 110 includes a plurality of pairs of rolling rolls 111 and 112 arranged in series. A pair of pinch rolls 121 and 122 are disposed downstream of the rolling mill 110 in the direction in which the wire rod 2 is delivered.

A laying head 130 that feeds out the wire 2 in a loop is disposed downstream of the pinch rolls 121 and 122 in the feeding direction of the wire 2. The laying head 130 includes a spiral guide tube (not shown), and when it rotates, it sends out the wire 2 fed to the proximal end of the guide tube in a loop form from the distal end of the guide tube. It is now possible to do so.

The downstream side in the feeding direction of the wire rod 2 of the laying head 130 is connected to the upstream side in the conveying direction of a conveyor 140 that conveys the wire rod 2 in a loop shape. On the downstream side of the conveyor 140 in the conveyance direction, a cylindrical convergence device 150 that converges the wire rod 2 from the conveyor 140 into a coil shape is disposed. In addition, in FIG. 1, 101 is a hot mass detector (HMD). The HMD 101 is disposed near the receiving port for the material 1 of the rolling mill 110, and is capable of detecting when the end of the material 1 has passed.

A wire manufacturing method for manufacturing a wire 2 from a raw material 1 using the wire manufacturing apparatus 100 according to this embodiment will be described next.

The raw material 1 is fed to a rolling mill 110, rolled to a desired diameter size by rolling rolls 111 and 112, and sent out as a wire rod 2. The pinch rolls 121 and 122 feed the wire 2 to the base end side of the guide tube of the rotating laying head 130 while maintaining the tension of the wire 2 sent out from the rolling mill 110.

The laying head 130 sends out the wire 2 fed into the guide tube from the tip side onto the conveyor 140 in a loop shape. The conveyor 140 conveys the wire 2 in a loop shape to a converging device 150 and delivers it thereto. The focusing device 150 winds the wire 2 into a coil shape and focuses the wire 2 into a coil. Thereby, the wire rod 2 having the desired diameter size can be obtained from the raw material 1.

The rotation speed of the laying head 130 is set according to the rolling speed of the rolling mill 110. As the rolling speed increases, the length of the wire fed to and from the laying head 130 per unit time becomes longer. Therefore, if the rotational speed of the laying head is the same, the diameter of the wire loop formed by the laying head 130 becomes larger. The diameter of the loop is approximately equal to the diameter of the wire coil formed by being focused by the focusing device 150. Since the diameter of the coil to be manufactured is determined in advance, when the rolling speed is high, the rotation speed of the laying head 130 is increased. That is, the rotation speed of the laying head 130 is set according to the rolling speed.

Moreover, the rolling speed of the rolling mill 110 generally becomes slower as the diameter of the wire rod after rolling becomes larger. Here, the rolling speed of the rolling mill 110 means the speed of the wire at the exit side of the most downstream rolling rolls 111 and 112 of the rolling mill 110, which in turn becomes the feeding speed of the wire to the rolling head 130. . The reason why the rolling speed becomes slower as the diameter of the wire rod after rolling becomes larger is that if the feeding speed and diameter of the rolling material to the rolling mill 110 are constant, the smaller the diameter of the wire rod after rolling is, the slower the rolling speed becomes. This is because the higher the area reduction rate due to rolling, the higher the speed of the wire rod on the exit side of the rolling mill.

In this embodiment, when the diameter of the wire 2 is large, that is, the rolling speed (traveling speed) is slow and less than the reference speed Vs, when the HMD 101 detects the end of the material 1, the wire manufacturing apparatus 100 detects the detection result of the HMD 101. Based on this, do the following: That is, the wire manufacturing apparatus 100 increases the rotational speed of the laying head 130 so that the rotational speed of the laying head 130 becomes equal to or higher than the reference speed Vs immediately before the end of the wire 2 enters the guide tube of the laying head 130.

As a result, the wire rod 2 does not remain in the guide tube of the laying head 130, but is completely sent out from the guide tube. The reason for this will be explained below.

When the terminal end of the wire 2 passes through the pinch rolls 121 and 122, the laying head 130 needs to send out the wire 2 using only the inertia force accompanying the running movement of the wire 2 and its own rotational force. For this reason, conventionally, when the rolling speed (travel speed) is slow and the rotation speed of the laying head is slow, after the end of the wire 2 passes through the pinch rolls, the entire wire 2 is sent out from the spiral guide tube of the laying head. In some cases, it remained in the guide tube without being removed.

Therefore, in this embodiment, when the rolling speed (traveling speed) is slow and less than the reference speed Vs, there is a risk that the wire rod 2 will not be completely fed out from the guide tube of the laying head 130 and will remain in the guide tube. In such cases, the above-mentioned method is adopted. That is, the rotational speed of the laying head 130 is increased so that it reaches the reference speed Vs or more just before the end of the wire 2 enters the guide tube of the laying head 130.

As a result, even after the end of the wire rod 2 has passed through the pinch rolls 121 and 122, the inertia force is large and the feeding force by the laying head 130 is also large, so that the wire rod 2 does not remain in the guide tube of the laying head 130 and can be removed from the guide tube. All are sent out.

Therefore, according to this embodiment, even when manufacturing a wire rod 2 with a large diameter, it is possible to reliably send out all the wire rods 2 from the guide tube of the laying head 130.

Note that the reference speed Vs depends on various aspects of the wire manufacturing apparatus 100, such as the length of the guide tube of the laying head 130, the diameter size of the helical shape, and the length between the rolling mill 110 and the pinch rolls 121, 122 and the laying head 130. This is a value that can be set for each manufacturing device by conducting experiments based on the original.

In this embodiment, the rotational speed of the laying head 130 is increased so that it reaches the reference speed Vs or more just before the end of the wire 2 enters the guide tube of the laying head 130, but the timing for increasing this rotational speed is as follows: It does not have to be immediately before, but it is sufficient as long as it is before the terminal end of the wire 2 enters the guide tube of the laying head 130. When increasing the rotation speed of the laying head 130 before the end of the wire 2 has passed through the rolling mill 110, the wire manufacturing apparatus 100 runs the rolling head 130 at a constant tension without loosening the wire 2. The rolling speed of the pinch rolls 121 and 122, and the rotational drive of the laying head 130 are synchronized. Therefore, depending on the above-mentioned specifications of the wire rod manufacturing apparatus 100, when the rotation speed of the laying head 130 is increased while the wire rod 2 is being rolled by the rolling rolls 111 and 112 of the rolling mill 110, the rotation speed of the laying head 130 may be increased. The rolling speed and the circumferential speed of the pinch rolls are also increased. By increasing the rolling speed and the circumferential speed of the pinch rolls in synchronization with the rotational speed of the laying head 130 before the end of the wire rod 2 has passed through the rolling mill 110, the running speed of the end of the wire rod 2 is also increased. The speed at which the laying head 130 enters the guide tube also becomes faster. For this reason, the effect of preventing the terminal end of the wire rod 2 from remaining in the guide tube becomes greater. In this case, the rolling speed of the rolling rolls 111 and 112 is increased during rolling, which may lead to deterioration in the quality of the wire rod 2.

However, the portion of the wire rod 2 that has been rolled by increasing the rolling speed of the rolling rolls 111 and 112 is not very long and is not much different from the length cut by normal trimming, so it cannot be removed by trimming. , there is no particular problem.
In addition, when increasing the rotation speed of the laying head 130 at the point when the end of the wire rod 2 is between the rolling mill 110 and the pinch rolls 121, 122, the peripheral speed of the pinch rolls 121, 122 is changed to the rotation of the laying head 130. You can speed it up by synchronizing it with the speed. Even in this case, it is possible to increase the traveling speed of the terminal end of the wire rod 2 and, by extension, the speed at which the terminal end of the wire rod 2 enters the guide tube. However, in this case, the only driving force that increases the running speed of the wire rod 2 is the frictional force between the pinch rolls 121, 122 and the wire rod, and slipping may occur between the pinch rolls 121, 122 and the wire rod 2. Then, the running speed of the wire rod 2 may not increase as much as expected. In addition, since the pinch rolls 121 and 122 are located closer to the laying head 130 than the rolling mill 110, depending on the distance between the pinch rolls 121 and 122 and the laying head 130, the guide tube of the laying head 130 may The time it takes for the end of the wire 2 to arrive is short, and it may not be possible to secure enough time to speed up the end of the wire 2.

On the other hand, when the rolling speed and the circumferential speed of the pinch rolls are increased in synchronization with the rotation speed of the rolling head 130 before the end of the wire rod 2 has passed through the rolling mill 110 as described above, the rolling mill 110 and the pinch roll speed are increased. Since both the rolls 121 and 122 act as a driving source to increase the running speed of the wire rod 2, the running speed of the terminal end of the wire rod 2 can be reliably increased. If the speed of the rolling mill and pinch rolls is increased before the end of the wire 2 has passed through the rolling head 110, the time it takes for the end of the wire 2 to reach the rolling head 130, that is, Since a longer acceleration time can be secured, the rotational speed of the laying head at the time when the end of the wire 2 enters the guide tube and the speed at which the end of the wire 2 enters the guide tube can be made faster. Therefore, it is preferable to increase the rolling speed and the circumferential speed of the pinch rolls in synchronization with the rotational speed of the laying head 130 before the end of the wire rod 2 has passed through the rolling mill 110.

<Other embodiments>
In addition, in the embodiment mentioned above, the case where the diameter of the wire rod 2 is large and the rolling speed (travel speed) is slow has been described, but the present invention is not limited to this. As another embodiment, for example, due to the performance of the rolling mill 110, if the rolling speed (travel speed) is increased, vibration may occur and quality may deteriorate, so the rolling speed (travel speed) must be decreased. Even if this is not possible, it can be applied in the same manner as in the embodiment described above.

Further, in the above-described embodiment, a case has been described in which the wire manufacturing apparatus 100 has the pinch rolls 121 and 122 disposed between the rolling mill 110 and the laying head 130, but the present invention is not limited to this. As another embodiment, for example, depending on various specifications of the wire manufacturing apparatus, it is also possible to omit the pinch rolls 121 and 122 and send the wire 2 directly from the rolling mill 110 to the laying head 130. .

Furthermore, in the embodiment described above, a case has been described in which the wire manufacturing apparatus 100 is configured such that the HMD 101 is disposed near the receiving port of the material 1 of the rolling mill 110 so as to be able to detect passage of the end of the material 1. The invention is not limited to this. As another embodiment, for example, depending on various specifications of the wire rod manufacturing apparatus, an HMD 101 may be arranged between the rolling mill 110 and the pinch rolls 121, 122 so as to be able to detect that the end of the wire rod 2 has passed. It is also possible to do so.

Furthermore, as another embodiment, for example, it is naturally possible to apply other detection means capable of detecting the end of the wire 2 instead of the HMD 101.

In addition, as another embodiment, for example, the detection means such as the HMD 101 is omitted, and the timing for increasing the rotational speed of the laying head 130 is determined based on various manufacturing conditions such as the sizes of the material 1 and the wire rod 2 and the rolling speed. It is also possible to obtain it in advance and take action accordingly.

The wire rod manufacturing method according to the present invention can send out all the wire rods from the guide tube of the laying head even when manufacturing large diameter wire rods, so it can be extremely usefully used in the steel industry etc. can.

1 Material 2 Wire 100 Wire manufacturing equipment 101 Hot mass detector (HMD)
110 rolling mill 111,112 rolling roll 121,122 pinch roll 130 laying head 140 conveyor 150 converging device

Claims (2)

The material is rolled into a wire rod, and the wire rod is fed into a coiled shape by feeding the wire rod into a spiral guide tube of a laying head that rotates at a rotation speed set according to the rolling speed. In the method of manufacturing a wire rod,
When manufacturing the wire rod by rolling the material at a rolling speed lower than the reference speed, the end of the wire rod passes through a rolling mill before the end of the wire rod enters the guide tube of the laying head. A method for manufacturing a wire rod, characterized in that the rotational speed of the laying head is subsequently increased to a rotational speed set according to the reference speed or more . In the wire manufacturing method according to claim 1 ,
A method for manufacturing a wire rod, characterized in that the circumferential speed of a pinch roll disposed on the entry side of the laying head is synchronized with the rotational speed of the laying head.

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