JPH1087174A - Tensile force control method and device for long member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely control the tensile force of a long member with a simple structure. SOLUTION: A take-up reel 14 is rotated to continuously let off a wire member 10 from a supply reel 12. The number of revolutions N of the supply reel 12 and the let-off velocity V of the wire member 10 detected by a rotation sensor means 34 and by a velocity sensor means 36 are inputted into the arithmetic part of a controller in a real-time mode, based on which the wound diameter D of the wire member 10 on the supply reel 12 transiently decreases is calculated. On the basis of the obtained wound diameter D and a tensile force value F stored in advance, the most proper torque value Tr of an electromagnetic powder brake 32 at that time is calculated. A current value A establishing the torque value T is outputted to a current regulator as a regulation command signal to thereby vary the current flowing through the electromagnetic powder brake 32 so as to set the torque of the brake 32 to the torque value Tr.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for controlling the tension of a long material, and more particularly, to variably controlling a torque value of a braking means provided on a reel.
The present invention relates to a method for controlling the tension of a long material that can always keep the tension of a long material pulled out from a reel, and an apparatus suitably used for performing the method.

[0002]

2. Description of the Related Art For example, a device shown in FIG. 5 or FIG. 6 is generally used as a device for drawing out a long wire rod made of alloy steel wound on a reel from the reel and heat-treating or storing it. Used in This apparatus comprises a supply reel 1 on which an alloy steel wire rod 10 is wound with a required diameter.
A heating furnace 16 is arranged in series between the reel 2 and a take-up reel 14 for winding the processed wire 10. By rotating the take-up reel 14 by the torque motor 18, the wire 10 is subjected to a heat treatment or a storage process in a process of passing the wire 10 continuously drawn from the supply reel 12 through the inside of the heating furnace 16. At the same time, it is configured to obtain linearity.

[0003] In the heat treatment or memory treatment apparatus for the alloy steel, the wire rod 10 wound around the reel 12 is continuously drawn from the supply reel 12.
The winding diameter of 0 decreases with time. That is, since the winding diameter of the supply reel 12 decreases over time and its mass decreases, the tension applied to the wire 10 continuously drawn from the supply reel 12 also changes. As a result, there is a problem that the diameter of the wire 10 that is passed through the heating furnace 16 and that is heat-treated or memorized is changed to cause variations in dimensions, and that the straightness (linearity) is also reduced.

Conventionally, as shown in FIG. 5 or FIG. 6, a wire rod 1 is provided between a supply reel 12 and a heating furnace 16.
And a tension detecting device 2 for mechanically detecting the tension acting on the wire 10.
2 is arranged. Then, the tension acting on the wire 10 is directly detected by the tension detecting device 22, and the brake device 20 is controlled based on the detected value so that the tension of the wire 10 drawn from the supply reel 12 is kept constant. I have. Further, a capstan roll 26 rotated and driven by a motor 24 is disposed downstream of the heating furnace 16, and the speed of the roll 26 is controlled so that the tension acting on the wire 10 from the tension detection device 22 to the capstan roll 26 is controlled. Is kept constant. Further, by controlling the torque of the torque motor 18 that drives the take-up reel 14 to rotate, the tension applied when the wire 10 is wound is kept constant.

[0005]

In the heat treatment or memory processing apparatus, the tension when the wire 10 is pulled out from the supply reel 12, the tension when the wire 10 passes through the heating furnace 16, and the winding of the wire 10 It is configured to control the tension when each is applied. According to this configuration, it is possible to control the tension of the wire 10 with high accuracy, but it is pointed out that the structure becomes extremely complicated and the cost increases. In addition, depending on various conditions such as the material of the wire 10 to be processed, there is a case where relatively high-precision tension control is not required. is there.

The supply reel 12 and the heating furnace 1
6, the brake device 20 and the tension detecting device 22 must be provided, and there is a problem that the entire device becomes long and requires a large installation space. Further, the detection target range of this type of tension detection device 22 is limited in size and the like, and there are cases where it cannot be used.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed to solve the problem suitably. It is an object of the present invention to provide a method and a device for controlling the tension of a long material to be obtained.

[0008]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and achieve the intended object, a method for controlling the tension of a long material according to the present invention is a method for controlling the tension of a long material drawn from a reel. Detecting the speed of the long material pulled out from the reel, detecting the rotation speed of the reel, and calculating the winding diameter of the long material wound on the reel from the detected value by calculation. The torque value of the braking means for applying a braking force to the reel is variably controlled based on the obtained winding diameter such that the long material is always drawn with a constant tension.

According to another aspect of the present invention, there is provided a tension control device for controlling the tension of a long material drawn from a reel, the braking device applying a braking force to the reel. Braking means, speed detecting means for detecting the speed of the long material pulled out from the reel, rotation detecting means for detecting the rotation speed of the reel, and detection speed and rotation detection means detected by the speed detecting means In accordance with the rotation speed detected in the above, the winding diameter of the long material wound on the reel is calculated, and the obtained winding diameter and a preset optimum tension value of the long material are used to calculate the winding diameter. And a control unit that controls the braking unit so that the torque value is calculated by the calculating unit.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a method and an apparatus for controlling the tension of a long material according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram showing an alloy steel processing apparatus employing a tension control device according to an embodiment,
The supply reel 12 in which the alloy steel wire rod 10 is wound with a required diameter is rotatably supported on a rotating shaft 28 rotatably supported by a bearing (not shown). Downstream of the support position of the supply reel 12, a heating furnace 16 and a motor 3
0 and a take-up reel 14 which is rotated by the rotation of the supply reel 12
Is wound on a take-up reel 14 after passing through a heating furnace 16.

An electromagnetic powder brake 32 as braking means is connected to one end of the rotating shaft 28, and the rotating shaft 2
An appropriate braking force can be applied to the free rotation of the supply reel 8 and the supply reel 12. That is, when the electromagnetic powder brake 32 is released, the supply reel 12 can freely rotate together with the rotary shaft 28. When the electromagnetic powder brake 32 is pressed,
A braking force is applied to the pull-out rotation of the supply reel 12 via the rotation shaft 28. The tension control device according to the embodiment is configured to adjust the braking force in real time according to the winding diameter D of the wire 10 on the supply reel 12 that decreases with time.

The rotation shaft 28 is provided with rotation detection means 34 for detecting the rotation speed N. In addition, heating furnace 1
In the path of the wire 10 between the take-up reel 6 and the take-up reel 14, a measuring roll 38 to which a speed detecting means 36 such as a pulse generator is connected is disposed so as to rotate in contact with the wire 10. Speed detection means 3
6 to be detected. The rotation detecting means 3
As shown in FIG. 2, outputs from the speed detector 4 and the speed detecting means 36 are output from a controller 4 such as a microcomputer or a sequencer.
0 is input to the arithmetic unit 42. Further, numerical information such as the diameter and material of the wire 10 and the optimal tension value F is input and stored in the arithmetic unit 42 in advance via input means 44 such as a ten key. In the arithmetic section 42, the rotation speed N detected by the detection means 34 and 36 is used.
And withdrawal speed V, supply reel 1
2 is set so as to obtain the current winding diameter D of the wire rod 10. Further, it is set so that an appropriate torque value Tr of the electromagnetic powder brake 32 at the winding diameter D is calculated from the obtained winding diameter D and the tension value F set and input in advance.

The electromagnetic powder brake 32 is configured such that the torque value Tr is varied by controlling the change of the current value A by the current adjusting device 46 shown in FIG. Then, in the calculation unit 42 of the control device 40,
The current value A at which the torque value Tr of the electromagnetic powder brake 32 obtained as described above is obtained is calculated and output to the current adjusting device 46 via the control unit 48.

Here, the drawing speed of the wire 10: V, the winding diameter of the supply reel 12: D, the rotation speed of the supply reel 12: N, the optimal tension value of the wire 10: F, the torque value of the electromagnetic powder brake 32: The following relational expression holds between Tr. D = V / N Formula Tr = F × D Formula The torque value Tr of the electromagnetic powder brake 32 and the current value A have a direct proportional relationship shown in the graph of FIG. That is, in the arithmetic section 42, the winding diameter D
, The torque value Tr is determined by an equation, and further, the current value A corresponding to the torque value Tr is determined. The current adjusting device 46 is controlled by the output command from the control unit 48, so that the tension applied to the wire 10 can be maintained at a preset tension value F.

[0015]

Next, the operation in the case where the heat treatment or the storage treatment of the alloy steel is performed by the heat treatment or the storage treatment device employing the tension control device according to the above-described embodiment will be described. Wire rod 1 drawn from the supply reel 12
0 is wound around the take-up reel 14 after passing through the heating furnace 16. In the tension control device, the diameter and material of the wire 10 wound around the supply reel 12 and the wire 10
Is input and stored in the arithmetic unit 42 of the control device 40 via the input means 44.

In this state, by driving the motor 30 to rotate the take-up reel 14, the wire 10 is continuously drawn from the supply reel 12. The rotation speed N of the supply reel 12 and the withdrawal speed V of the wire 10 detected by the rotation detecting means 34 and the speed detecting means 36 are input in real time to the arithmetic unit 42 of the control device 40, and the two detected values N, V , The winding diameter D of the wire 10 of the supply reel 12 that decreases with time is calculated. Further, the most appropriate torque value Tr of the electromagnetic powder brake 32 at that time is calculated from the obtained winding diameter D and the tension value F input in advance. And
A current value A, which is the obtained torque value Tr, is output as an adjustment command signal to the current adjustment device 46, and the current flowing through the electromagnetic powder brake 32 is variably adjusted so that the torque of the brake 32 is reduced to the torque value F. So that

As a result, a braking force suitable for the winding diameter D of the wire rod 10 which decreases with time is applied to the supply reel 12 from the electromagnetic powder brake 32, and
, A constant tension (a tension value F set and input in advance) always acts. Therefore, the diameter of the heat-treated or memorized wire 10 passing through the heating furnace 16 becomes uniform, and a product with good straightness (linearity) is manufactured. Further, since no mechanical tension detecting device is provided, the configuration can be simplified, the installation space of the device can be reduced, and the cost can be reduced.

[0018]

[Other Embodiments] In the above-described embodiment, the case where a tension control device is used as a heat treatment or memory processing device for alloy steel has been described. However, the tension control device is preferably used in the wire winding device shown in FIG. It can be adopted. The take-up device shown in the figure is a supply reel 12 on which a wire 10 is wound.
A take-up reel 14 for winding the wire 10 of a required length drawn from the reel 12, and a length detecting device 50 disposed between the reels 12 and 14 for detecting the drawn length of the wire 10. It is basically composed of In this winding device, an electromagnetic powder brake 32 is provided on the supply reel 12.
, And the rotation speed N of the reel 12 is detected by the rotation detecting means 34. Further, between the reels 12 and 14, a speed detecting means 36 for detecting a drawing speed V of the wire 10 drawn from the supply reel 12 is arranged.

The rotation speed N of the supply reel 12 detected by the rotation detecting means 34 and the speed detecting means 36
By inputting the drawing speed V of the wire 10 to the control device 40, the supply reel 1 is supplied in the same manner as in the above-described embodiment.
2, a braking force suitable for the winding diameter D of the wire 10 that decreases with time is applied from the electromagnetic powder brake 32,
A constant tension (a tension value F set and input in advance) always acts on the wire 10. Therefore, the wire rod 10 is wound on the winding reel 14 in a proper winding state with a constant tension and without unevenness.

In this embodiment, the case has been described in which an electric braking means such as an electromagnetic powder brake is used as a braking means for applying a braking force to the supply reel. A braking means such as a brake may be used. In this case, by adjusting the amount of supply of air or oil or the pressure, the torque value of the braking means can be controlled to an appropriate value to keep the tension constant. Further, the long material is not limited to the wire material, but may be a bar material, a band material, or the like.

[0021]

As described above, according to the method and the apparatus for controlling the tension of a long material according to the present invention, the winding of the long material is performed based on the speed of the long material drawn from the reel and the rotation speed of the reel. The diameter is obtained by calculation, and the braking means is controlled so as to have a torque value corresponding to the winding diameter. This allows
Even if the winding diameter decreases over time with the consumption of the long material wound on the reel, the long material can always be drawn out with a constant tension. Therefore, for example, when adopted for heat treatment or memory processing of alloy steel, it has a uniform diameter and straightness
Products with good (linearity) can be manufactured. Further, the electromagnetic powder brake can easily and accurately control the torque value only by variably controlling the current value, so that the configuration of the device can be simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heat treatment or memory processing device for alloy steel employing a tension control device according to an embodiment.

FIG. 2 is a control block diagram of a tension control device according to the embodiment.

FIG. 3 is a graph showing a relationship between a torque value and a current value of an electromagnetic powder brake.

FIG. 4 is a schematic configuration diagram of a winding device employing the tension control device according to the embodiment.

FIG. 5 is a schematic configuration diagram of a heat treatment or memory treatment device for an alloy steel according to the related art.

FIG. 6 is a schematic configuration diagram of a heat treatment or memory treatment device for another alloy steel according to the related art.

[Explanation of symbols]

 Reference Signs List 10 wire rod (long material) 12 supply reel 32 electromagnetic powder brake (braking means) 34 rotation detection means 36 speed detection means 42 calculation unit 48 control unit A current value D winding diameter of wire rod F tension value N rotation speed of supply reel Tr Torque value of electromagnetic powder brake V Wire drawing speed

Claims (4)

[Claims] 1. A method for controlling the tension of a long material (10) drawn from a reel (12), wherein the speed (V) of the long material (10) drawn from the reel (12) is controlled. At the same time, the rotation speed (N) of the reel (12) is detected, and from the detection value (V, N), the winding diameter (D) of the long material (10) wound on the reel (12) is detected. The torque value (Tr) of the braking means (32) for applying a braking force to the reel (12) is calculated based on the obtained winding diameter (D) so that the long material (10) is always constant. A tension control method for a long material, wherein the tension is variably controlled so as to be drawn out by tension. 2. A long material wound around the reel (12).
From the optimal tension value (F) of (10) and the winding diameter (D) of the long material (10) obtained by the above calculation, the braking means at the winding diameter (D)
2. The tension control method for a long material according to claim 1, wherein an appropriate torque value (Tr) of (32) is obtained, and the braking means (32) is controlled so as to obtain the torque value (Tr). 3. A device for controlling the tension of a long material (10) drawn from a reel (12), comprising: a braking means (32) for applying a braking force to the reel (12); Speed detecting means (36) for detecting the speed (V) of the long material (10) drawn from the 12), and rotation detecting means for detecting the rotation speed (N) of the reel (12)
(34), a reel speed based on the detected speed (V) detected by the speed detecting means (36) and the rotation speed (N) detected by the rotation detecting means (34).
Along with calculating the winding diameter (D) of the long material (10) wound on (12), the obtained winding diameter (D) and the preset long material (10)
The optimal tension value (F) of the braking means at the winding diameter (D)
(32) a calculation unit (42) for calculating an appropriate torque value (Tr); and a control unit for controlling the braking means (32) to be the torque value (Tr) calculated by the calculation unit (42). (48) A tension control device for a long material, comprising: 4. The braking means comprises an electromagnetic powder brake (3
The tension control device for a long material according to claim 3, wherein the torque value (Tr) is controlled by variably controlling a current value (A) flowing through the brake (32).