JPS5922772B2 - Wire running control method in wire manufacturing process - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to wire rods used in the electric wire manufacturing process, in which wire strips for electric wire are continuously drawn and annealed and then taken off, or wires are continuously drawn, annealed, extruded and coated, and then taken off. This invention relates to a travel control method.

As is well known, the wire manufacturing process of continuously drawing, annealing, and extrusion coating a wire for electric wire, such as a copper wire, involves drawing it to a predetermined wire diameter in a wire drawing machine 1, as shown in FIG. The drawn wire 2 is guided from the finish capstan 1A at the final stage of the wire drawing machine 1 driven by the wire drawing drive motor M1 to an annealing device, for example, a continuous resistance annealing device 3, and in the continuous resistance annealing device 3, an electrode is formed. 1st capstan 3 which also serves as
A, the wire 2 is preheated by resistance heat generated by the current between the second capstan 3B and the second capstan 3B.
The wire 2 is annealed by resistance heat generated by the electric current between it and the third capstan 3C, which also serves as an electrode, and the annealed wire 2 is preheated for extrusion coating by a preheater 4 made of an induction heating device, for example. Subsequently, the wire rod 2 is coated with an insulation coating using an extruder 5, and the wire rod 2 coated with the insulation coating is further guided into a cooling device 6 to be cooled.
Next, the wire rod 2 is taken up by the take-up capstan 7.7' driven by the take-up drive motor, and then the wire rod 2 is
There is a known method for winding the material onto the bobbin 8.

In the above-mentioned wire manufacturing process, the wire 2 is softened by annealing from the outlet of the wire drawing machine 1 to the take-off capstan 7.71, and is further heated and softened during the extrusion process, so The wire rod 2 ends up being elongated by a certain amount due to the tension.

However, it is necessary to make the circumferential speed of the finishing capstan 1A of the wire drawing machine 1 slower than the circumferential speed of the take-off capstan 7, 7' to some extent.

Conventionally, as a speed control method for this purpose, the take-up drive motor M is controlled so that the circumferential speed of the take-up capstan 7, 7' is kept at a certain constant value.

The angle detector 31 provided on the dancer 30 measures the deflection or tension of the wire between the outlet of the wire drawing machine 1 and the take-up capstan 7.1' in this state. The rotation of the wire drawing drive motor M is controlled so that the deflection or tension of the wire rod between the outlet of the wire drawing machine 1 and the take-up capstan 7, T is constant. A common method has been to make the circumferential speed of the finished capstan 1A of the wire drawing machine 1 follow the wire speed near the exit of the wire drawing machine 1.

However, in such a conventional control method, if the elongation of the wire rod 2 between the outlet of the wire drawing machine 1 and the take-up capstan 7.7' changes, the control method moves in a direction to absorb the change in elongation. Since the rotation of the wire drawing and driving motor M1 changes accordingly, the elongation change of the wire rod 2 is allowed as it is, and as a result, the elongation rate ε of the wire rod 2 as a product taken by the take-up capstan 7.7' is increased. There is also the problem that things change.

For example, the wire rod 20 wire speed at the take-off capstan 7°7' (that is, the circumferential speed of the take-off capstan 7.7') is 200
The elongation rate of the product wire rod is set to 0 rrL/ml yt, and the wire speed at the outlet of the wire drawing machine 1 (i.e., the circumferential speed of the finished capstan 1A) is 1500 m, 7 ml yt with respect to the standard speed. Assuming that ε is an optimal value, the capstan 7.7'
If the amount of elongation of the wire rod 2 during that period increases due to reasons such as the softening of the wire rod 2 becoming more severe than normal, the wire speed at the outlet of the wire drawing machine 1 will increase to 1500 m/min. - As a result, the elongation of wire rod 2 cannot be suppressed, and eventually the elongation of wire rod 2 becomes significantly large, and the elongation rate of the wire rod as a product is extremely lower than the optimal value. Sometimes I put it away.

Furthermore, if the diameter of the finishing die of the wire drawing machine 1 changes due to wear or new replacement, and the diameter of the wire rod 2 at the outlet of the wire drawing machine 1 changes as a result, the wire drawing as described above Machine 2 and collection capstan 1. It is easy for the elongation to change between

This invention was made in view of the above circumstances, and in the process of continuously drawing and annealing wire for electric wire and taking it off, the wire is run so that the elongation rate of the wire as a final product does not change. The purpose is to provide a method for controlling the

That is, in the method of the present invention, the ratio of the circumferential speed of the finished capstan in the wire drawing process or the wire diameter of the wire in the vicinity to the circumferential speed of the take-up capstan or the wire diameter of the wire in the vicinity of the take-up capstan becomes a predetermined value. The rotation of the finishing capstan is controlled in this way, and at the same time, fluctuations in the elongation of the wire between the wire drawing machine and the take-off capstan are detected so that the actual length of the wire during this period is kept constant. The present invention is characterized in that the rotational speed of an appropriate capstan within the annealing device is controlled.

The control method of the present invention will be explained in more detail below.

First, the elongation rate of the wire that should be constant in this invention will be explained.The wire diameter d at the exit of the wire drawing machine.

Assuming that a tensile test is performed on a wire with a gauge distance of 1°, the wire diameter d.

elongation rate ε of the wire.

It can be expressed as .

Here, 1'o is the amount of elongation until tensile breakage occurs.

Also, the standard length of elongation when breaking under tension.

is Lo=lo+lol ・・・・・・・・・・・・・・・
...It can be expressed as (2).

The wire diameter d mentioned above. The wire extends until it reaches the entrance of the withdrawal capstan, and the gauge distance at the entrance of the withdrawal capstan becomes 11 (however, 11〉lo), and the wire diameter also decreases accordingly. The wire diameter at the capstan entrance is dl (however, dl<do).

Assuming that the wire having the wire diameter d1 is subjected to a tensile test again, the elongated gauge length Ll at the time of tensile breakage in that tensile test is the wire diameter d.

It should be the same as in the case of L1=Lo=lo+1.

’ −−−−−−・−・・−(3).

Therefore, the amount of elongation is 1.0 for a gage distance of 1° before the tensile test. ' is 11' = lo + 1゜'-1, --------・-・-(
It can be expressed as 4).

From this, the elongation rate ε of the wire with wire diameter d1 is It can be expressed as

Here, I from a1) formula. l−ε. 1o, again (mu,・-
Haaah 7, uh, o11.

And also the circumferential speed V of the finishing capstan of the wire drawing machine.

and peripheral speed V1 and wire diameter d of the take-up capstan.

, dl is, therefore, (6), (7
) can be expressed as from the formula.

As is clear from equation (8), the peripheral speed V of the finished capstan.

The elongation rate ε is determined by the ratio between the capstan V1 and the take-up capstan V1.

Also, as is clear from equation (6), the wire diameter d1. The elongation rate ε is also determined by the ratio of do.

Therefore, if the rotation of the finishing capstan of the wire drawing machine is controlled so that these ratios are kept constant, it is expected that the elongation rate will be kept constant.

However, in reality, by simply controlling the rotational speed of the finishing capstan of the wire drawing machine as described above, it is difficult to perform stable continuous operation in a state where equations (6) or (8) hold true.

In other words, if the wire drawing machine finishing capstan is controlled so that the above-mentioned ratio is constant, the rotation of the wire drawing machine finishing capstan changes to follow the elongation of the wire and fixes the elongated state as in the conventional example. However, there is no effect of actively suppressing the elongation of the wire between the finished capstan of the wire drawing machine and the take-off capstan, and therefore (6)
If the equation or equation (8) no longer holds true, it becomes difficult to maintain the elongation rate ε at a constant value.

Therefore, in this invention, as mentioned above, the circumferential speed is V.

, Vl ratio or wire diameter d, , doO ratio is controlled to a preset value, and at the same time the rotation speed of the wire drawing machine finishing capstan is controlled, and at the same time, the wire rod between the wire drawing machine finishing capstan and the take-up capstan is controlled. Changes in elongation are detected by a dancer or the like, and the rotational speed of any capstan in the annealing device is controlled so that the actual length of the wire is always constant during that time.

For example, if the wire tends to stretch more than normal between the finishing capstan of the wire drawing machine and the take-off capstan, the rotation of the capstan during the annealing process is slowed down to reduce the tension applied to the wire. conversely, when the elongation tends to be less than normal, the capstan in the annealing process is sped up to increase the tension applied to the wire, thereby increasing the elongation of the wire. do.

If the actual length between the finishing capstan 1A of the wire drawing machine 1 and the taking-off capstan 7.71 is controlled to be kept constant in this way, the above-mentioned control of the finishing capstan 1A of the wire drawing machine will always keep (6. ) or (8) can be established to maintain the elongation rate ε of the product wire at the set value.

Next, an example of a specific device for carrying out the control method of the present invention will be explained with reference to FIG. 2. The example shown in FIG. 2 shows the case where the capstan of the annealing device is driven independently. The wire drawing drive motor M1 that drives each capstan of the wire drawing machine 1 (including the finished capstan 1A shown in FIG. The rotational speed of the take-up drive motor for driving the take-up capstan 7.11 is controlled by the speed control device 11 in accordance with the signal from the linear speed setting device 9. each capstan 3A, 3B in the annealing device 3.
, 3C (see Figure 1), for example 3.
A is driven by an annealing capstan driving motor M2, and this motor M2 drives the annealing device 3 and the take-up capstan 7.
．． The rotation speed is controlled by a speed control device 15 in accordance with a signal from a dancer position detector 14 that detects the position (angle) of the dancer 13 provided between the dancer 71 and the linear speed setting device 9. .

Further, tachometers 16 and 17 such as tacho generators are attached to the wire drawing drive motor M1 and the take-up drive motor Mo, respectively, and speed signals from these tachometers 16 and 17 are sent to the speed ratio detector 10. It is now entered.

The speed ratio detector 10 is also provided with a speed ratio setting device 18 for manually setting the speed ratio, and the speed ratio setting device 18 sets the speed ratio by the ratio of the speed signals from both the tachometers 16 and 17. The difference between the two (
(or ratio) is configured to output a signal that changes in accordance with the ratio.

In the example shown in FIG. 2, the reference linear speed, that is, the linear speed at the take-off capstan 7, γ', is set in advance in the linear speed setting device 9, and the wire drawing speed at the take-off capstan 7, 7' is set in advance. The speed ratio setter 18 sets the speed ratio of the machine in advance.
Set it to .

In this way, the take-up drive motor M rotates the take-up capstan 7.7' at a circumferential speed corresponding to the reference linear velocity.

The rotational speed of the wire drawing drive motor M1 is controlled in advance with respect to the reference speed by a speed ratio signal having a value corresponding to the speed ratio set in the speed ratio setting device 18 and a signal from the linear speed setting device 18. It is controlled to rotate at the specified speed ratio.

And a take-up drive motor Mo and a wire drawing drive motor M
1 is detected by the tachometers 16 and 17, and if the speed ratio of both is equal to the preset speed ratio, the state is maintained as it is, and the speed ratio of both is different from the preset speed ratio. In this case, the output of the speed ratio detector 10 changes in a direction that reduces the difference, thereby correcting the rotational speed of the wire drawing drive motor M1.

On the other hand, the annealing capstan driving motor M2 corrects the reference speed set by the linear speed setting device 9 so that the dancer 13 maintains a fixed position based on a signal from the dancer position detector 14.

That is, for example, the annealing device 3 and the take-off capstan 7°7'
When the actual length of the wire between the two increases, the speed of the annealing capstan driving motor M2 changes in the direction of decreasing the actual length.

While the rotation of the capstan of the annealing device 3 is controlled as described above, the circumferential speed of the finishing capstan 1A of the wire drawing machine 1 becomes a preset ratio to the circumferential speed of the take-off capstan 7.7'. As a result, the elongation rate ε is always kept constant.

Although the extrusion coating device is not shown in the example of FIG. 2, the annealing device 3 and the withdrawal capstan γ are shown.

It goes without saying that an extrusion coating device may be provided between 7' and 7'.

FIG. 3 shows a second specific example of the apparatus for carrying out the method of the present invention, in which any capstan in the annealing apparatus 3 is extended via a continuously variable transmission 19. The gear ratio of the continuously variable transmission 19 is controlled by a pilot motor M3 which is driven by a linear drive motor M1 and whose speed is controlled by a signal from a dancer position detector 14 via a speed control device 20. ing.

That is, the gear ratio of the continuously variable transmission 19 is controlled so as to keep the dancer position constant.

Other points are similar to the first specific example shown in FIG.

FIG. 4 shows a third specific example for carrying out the method of the present invention, in which the diameter of the wire 20 at the outlet of the wire drawing machine and the inlet of the take-up capstan 7.7' are shown. Control is performed so that the ratio with the diameter of the lower wire becomes a preset value.

However, in this example, since the extrusion coating machine 5 is installed before the take-off capstan 7.7', the measured value of the diameter of the coated wire at the entrance of the take-off capstan 7.7' is used as the diameter of the wire itself ( It is necessary to convert it to (core wire diameter).

That is, in FIG. 4, the wire diameter of the coated wire at the entrance of the take-up capstan 7, 7' is measured by the outer diameter measuring device 22, and the wire diameter of the covered wire at the entrance of the take-up capstan 7.

The wire diameter of the covered wire is converted to a core wire diameter by a core wire diameter calculator 23 from the ratio of the take-up speed measured by a rotational speed meter 17 attached to the extruder 5 and the extrusion speed of the extruder 5. A signal corresponding to this is input to the outer diameter ratio detector 24.

Then, the outlet wire diameter of the wire drawing machine 1 is measured by the outer diameter measuring device 25 provided at the outlet of the wire drawing machine 1, and the signal thereof is also input to the outer diameter ratio detector 24.

Furthermore, an outer diameter ratio setting device 26 is attached to the outer diameter ratio detector 24, and the outer diameter ratio set in this outer diameter ratio setting device,
The ratio of the actual outer diameters obtained from the core wire diameter calculator 23 and the outer diameter measuring device 25 are compared, and when a difference occurs between the two, the output of the outer diameter ratio detector 24 changes and the wire is drawn. The rotational speed of the drive motor M1 is corrected, thereby keeping the outer diameter ratio constant.

The other configurations are similar to the example shown in FIG.

As is clear from the above description, according to the wire running control device of the present invention, it is possible to maintain the elongation rate of the product wire at a constant value, and therefore it is possible to obtain an electric wire of stable quality.

[Brief explanation of drawings]

Figure 1 is a process diagram showing an example of a conventional general electric wire manufacturing process.
2 to 4 are block diagrams each showing an example of a device for carrying out the control method of the present invention. 1... Wire drawing machine, 1A-... Finished capstan, 3... Annealing device, 3A-3C...
・Capstan of annealing equipment, 7, 78...Take-back capstan, 13...Dancer.

Claims (1)

[Scope of Claims] 1. In an electric wire manufacturing process in which a wire for electric wire is continuously drawn by a wire drawing machine, the wire is continuously annealed by an annealing device, and the annealed wire is continuously taken by a take-up capstan, The finish of the wire drawing machine is adjusted so that the ratio of the circumferential speed of the finishing capstan of the wire drawing machine or the wire diameter of the wire near the finishing capstan to the peripheral speed of the stan or the wire diameter of the wire near the take-up capstan is a preset value. The rotational speed of the capstan is controlled, and in conjunction with this, fluctuations in the elongation of the wire between the wire drawing machine and the take-off capstan are detected by a dancer installed between them, and the actual length of the wire between them is measured. A wire rod running control method comprising controlling the rotation of an appropriate capstan in an annealing device so that the elongation rate of the wire drawn into the drawing capstan remains constant. .