JPH10274578A - Tension detecting method for bar-wire material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect tension added to bar-wire material moving in the longitudinal direction even in the case of bar-wire material not so large in sectional area as well as the case of bar-wire material with relatively large sectional area that detects the current change of a drive motor caused by tension. SOLUTION: At the time of detecting tension T added to bar-wire material 1 moving in a longitudinal direction, the shape change of the bar-wire material 1 caused by the tension T is measured in a contact-less state using a bar-wire material sectional form measuring device 4, and the tension T added to the bar-wire material 1 moving in the longitudinal direction is detected from the previously obtained shape change data of the bar-wire material 1 caused by tension (T).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod / wire rod which is moved in a longitudinal direction at the time of drawing or rolling.
The present invention relates to a method for detecting the tension of a rod or a wire suitable for detecting the tension applied to the wire online.

[0002]

2. Description of the Related Art When a rod or wire is drawn or rolled, tension may be applied to a rod or wire that moves in the longitudinal direction, or tension may be applied.

For example, by applying a reverse tension to a rod or a wire at the time of drawing (for example, in the case of the reverse tension drawing method), the pressure acting on the die surface is reduced, and the die wear can be reduced. At the same time, the mechanical properties of the drawn material are improved.

[0004] Further, by detecting the tension applied to a rod or a wire during rolling, and using the detected tension as a control parameter for rolling control (for example, in the case of a tension controlled rolling method, a tensionless controlled rolling method, and the like). ), It is possible to perform more accurate rolling.

In order to detect on-line the tension applied to the rod / wire, or the tension applied to the rod / wire, for example, a current change (or a torque change, etc.) of a drive motor for moving the rod / wire in the longitudinal direction. And a method of indirectly detecting the tension applied to the rod / wire by this current change, or attaching a load cell to a part of a drive mechanism for moving the rod / wire in the longitudinal direction. There were a method of directly detecting the tension applied to the rod or wire, and a method of detecting the tension by forming a loop.

[0006]

However, in the method of indirectly detecting the tension applied to the rod / wire by the change in the current (or the change in torque) of the drive motor, the change in current due to the tension can be detected. There is a problem that it is difficult to apply the method to a bar / wire having a relatively large cross-sectional area, and that the detection becomes difficult when the moving speed of the bar / wire is increased.

In the method of directly detecting the tension applied to a rod or a wire using a load cell, an error occurs in the detected value of the tension when the frictional force (friction) increases when the tension is detected. There was a problem that could happen.

Further, in the method of detecting the tension by forming the loop, there is a problem that the loop becomes large when the moving speed of the rod or wire increases.

Therefore, not only in the case of a rod or a wire having a relatively large cross-sectional area where a change in the current of the drive motor due to tension can be detected, but also in the case of a rod or a wire having a relatively small cross-sectional area, the length of the rod or wire may be reduced. It has been a problem to be able to accurately detect the tension applied to a rod or wire moving in a direction.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is intended for a rod or wire having a relatively large cross-sectional area such that a change in current of a drive motor due to tension can be detected. Needless to say, it is an object of the present invention to accurately detect the tension applied to a rod / wire that moves in the longitudinal direction even in the case of a rod / wire having a relatively small cross-sectional area.

[0011]

According to a first aspect of the present invention, there is provided a method for detecting the tension applied to a rod or a wire moving in a longitudinal direction. At this time, using a rod and wire rod cross-sectional shape measuring device to measure the shape change due to the tension of the rod and wire rod, from the previously obtained data of the shape change due to the tension of the rod and wire rod,
The present invention is characterized in that a tension applied to a rod / wire moving in the longitudinal direction is detected.

In the embodiment of the method for detecting the tension of a rod or a wire according to the present invention, as described in claim 2, the dimension of the rod or the wire due to the tension is measured using a rod and wire cross-sectional shape measuring device. The change is measured, and the tension applied to the rod / wire moving in the longitudinal direction can be detected from the data of the dimensional change due to the tension of the rod / wire previously obtained.

[0013] Similarly, in an embodiment of the method for detecting the tension of a rod or wire according to the present invention, the diameter of the rod or wire by the tension of the rod or wire is measured using a rod or wire cross-sectional shape measuring device. The change is measured, and the tension applied to the rod / wire moving in the longitudinal direction can be detected from the previously obtained data of the diameter change due to the tension of the rod / wire.

Similarly, in an embodiment of the method for detecting the tension of a rod or wire according to the present invention, as set forth in claim 4, the apparatus for measuring the cross-sectional shape of the rod or wire is provided with respect to the moving direction of the rod or wire. The light emitter emits light toward the rod or wire from a direction perpendicular to the light, the light receiver that receives light other than the light cut off by the rod or wire at the approximate center, and the amount of light received by the light receiver It is possible to provide an arithmetic unit for measuring the diameter of a rod or a wire rod.

Similarly, in the embodiment of the rod / wire rod tension detecting method according to the present invention, as set forth in claim 5, the light projecting body and the light receiving body of the rod / wire rod sectional shape measuring device are rod / wire rod. By rotating integrally with the wire rod,
The shape of the wire can be measured.

Similarly, in the embodiment of the method for detecting the tension of a rod or wire according to the present invention, the apparatus for measuring the cross-sectional shape of a rod or wire may emit light from a light projecting body. Two or more different directions may be provided at equal angles.

[0017]

When a longitudinal tension is applied to a rod / wire, the rod / wire undergoes a diameter change due to the tension. Then, when the added tension is small and large, a difference occurs in the diameter change due to the tension,
When the tension is small, the diameter change due to the tension shown in FIG. 4 is relatively small, and when the tension is large, the diameter change due to the tension shown in FIG. 5 is relatively large.

Therefore, the diameter change (or dimensional change, shape change) due to the tension of the rod / wire moving in the longitudinal direction is determined by the rod / wire.
The tension applied to the rod / wire is detected by measuring the diameter of the rod / wire using the wire cross-section shape measuring device and referring to the data on the diameter change (or dimensional change, shape change) due to the tension of the rod / wire in advance. Can be done.

At this time, the diameter change (or dimensional change, shape change) of the rod / wire is measured by using a rod / wire cross-sectional shape measuring device.
By measuring the tension, the tension applied to the rod or wire moving at high speed can be accurately detected in a non-contact manner and also online.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for detecting the tension of a rod or wire according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a bar / wire rod moving line to which the present invention is applied. The rod / wire rod 1 moving in the direction of arrow A is provided with upper and lower rolling rollers or a drawing roller at the preceding stage. Rolling or drawing at a required area reduction rate by the dies 2U, 2D, and then the upper and lower rolling rollers or drawing dies 3U, 3D at the subsequent stage.
Thus, rolling or drawing is performed at a required area reduction rate.

The rolling rollers or drawing dies 2U, 2D, 3U, 3D are not limited to those of two stages in front and rear, and are not limited to those of upper and lower parts, and may be of multi-stage type. Needless to say, there may be a case where it is horizontal. Further, the rolling roller and the drawing die may be combined on the same line.

During such rolling or drawing, a tension T is applied to the rod / wire 1 moving in the direction of arrow A.

Therefore, when detecting the tension T,
As before, the following detection methods are used in addition to the indirect detection method based on the drive motor current change, the direct detection method using the load cell, or in combination with such a conventional detection method. It is also possible.
That is, in this detection method, the rod / wire rod cross-sectional shape measuring device 4 is installed between the preceding rolling roller or drawing die 2U, 2D and the subsequent rolling roller or drawing die 3U, 3D.

This rod / wire rod cross-sectional shape measuring device 4 includes a rod / wire
As shown in FIG. 2, light 42 is directed toward the rod / wire 1 on both the front and back surfaces of a disk-shaped rotator 41 which is arranged concentrically with the wire 1 and in a non-contact state so as to be rotatable at high speed.
Projector (e.g., a semiconductor or a lamp that converts an electric quantity into a light amount) 43A, 43B that emits L, convex lenses 44A, 44B that convert light 42L into parallel light 42P, and rod / wire 1 are cut off. Convex lenses 45A and 45B that make parallel light 42P other than light into convergent light 42G, and photoreceptors (for example, charge-coupled devices (CCD) that convert light quantity into electric quantity) 46A and 46B that make convergent light 42G incident are provided. Things.

In this case, the optical system (43A, 44A, 45A, 46A) provided on the surface of the disk-shaped rotating body 41
And an optical system (43B, 43B,
44B, 45B, 46B) means that each optical axis direction is 90
° Different.

Further, the photoreceptors 46A and 46B are
Since the disk-shaped rotator 41 having the optical system rotates at a high speed, the photoreceptor 46 is provided via an electric coupling 47 including a non-contact induction coil and a slip ring.
A calculator 48 is provided for measuring the diameter, size, shape of the rod / wire 1 and changes thereof based on the amounts of light received at A and 46B. Note that, instead of the electric coupling 47, a wireless device or the like may be used.

Further, in the present invention, the arithmetic unit 48
The data of the diameter, size, and shape change of the rod / wire 1 due to the tension is input from the data input device 49 in advance (FIG. 3 measures the diameter change of the rod / wire 1 by the tension in advance. The data obtained in this way are indicated by solid lines.)

Therefore, according to the present invention, when detecting the tension T applied to the rod / wire 1 moving in the longitudinal direction, the disk-shaped rotating body 4 of the rod / wire cross-section shape measuring device 4 is used.
1 is rotated at a high speed of, for example, about 600 rpm, and
3A and 43B, the light 42L is emitted, and the parallel light 42P whose central part is cut off by the rod / wire 1 is received as convergent light 42G by the light receiving bodies 46A and 46B.
By converting the amount of received light into an amount of electricity and inputting it to the calculator 48, the diameter, size, cross-sectional shape of the rod / wire 1 and changes thereof are measured.

On the other hand, the amount of change in diameter, size and shape when tension is applied to the rod / wire 1 (the measured amount of change in diameter is shown by a solid line in FIG. 3) is measured in advance and the data input device 4 is used.
9 is input to a computing unit 48 through the computing unit 48. In this computing unit 48, the amount of change in the diameter, size, and shape calculated based on the amount of light received by the photoreceptors 46A and 46B, and the previously measured tension The tension T is detected from the amount of change in diameter, size, and shape (the amount of change in diameter in the embodiment shown in FIG. 3), and is appropriately displayed.

This detection result is as shown by a broken line in FIG. 3 and can be detected as a value approximating the actually measured value, and the tension T applied to the moving rod / wire 1
Could be accurately detected online.

In this embodiment, the direction of the optical axis is 90
° Since two different rod / wire rod cross-sectional shape measuring devices 4 are provided, the diameter (dimension) scanned in a helical shape is different from the case where the rod / wire rod cross-sectional shape measuring device 4 using only one optical axis is used. Is twice as high, so that the accuracy is further increased. And, of course,
For example, if three rod / wire rod cross-sectional shape measuring devices 4 whose optical axis directions are different by 60 ° are used, the measurement accuracy of the diameter (dimension, shape) of the rod / wire rod 1 can be further improved. Can be further increased.

[0033]

According to the rod / wire rod tension detecting method of the present invention, the rod / wire rod cross-sectional shape measuring device is used to detect the tension applied to the rod / wire rod moving in the longitudinal direction. The shape change due to the tension was measured, and the tension applied to the bar / wire moving in the longitudinal direction was detected from the data of the shape change due to the tension of the rod / wire previously obtained. The rod that moves to
The shape change due to the tension of the wire rod is measured by a rod / wire rod cross-sectional shape measuring device, and the rod
By referring to the data of the shape change due to the tension of the wire, a remarkably excellent effect that the tension applied to the rod or wire can be detected online and accurately can be obtained.

And, as described in claim 2,
Using a rod / wire rod cross-sectional shape measurement device, measure the dimensional change of the rod / wire rod due to tension, and determine the rod / wire rod
By detecting the tension applied to the bar / wire moving in the longitudinal direction from the data of the dimensional change due to the tension of the wire, the dimensional change due to the tension of the rod / wire moving in the longitudinal direction is detected. While measuring with a cross-sectional shape measuring device, by referring to the data of the dimensional change due to the tension of the rod / wire rod determined in advance, the rod / wire
This has a remarkably excellent effect that the tension applied to the wire can be detected online and accurately.

Further, as described in claim 3,
Using a rod / wire cross-sectional shape measuring device, measure the diameter change due to the tension of the rod / wire, and add to the rod / wire moving in the longitudinal direction from the data of the diameter change due to the tension of the rod / wire previously obtained. By detecting the tension that has been applied, the diameter change due to the tension of the rod / wire moving in the longitudinal direction is measured by the rod / wire cross-sectional shape measuring device, and the tension of the rod / wire previously determined is measured. By referring to the data of the diameter change caused by the above, there is an extremely excellent effect that the tension applied to the rod or wire can be detected online and accurately.

Further, as set forth in claim 4, the rod / wire rod cross-sectional shape measuring apparatus emits light toward the rod / wire rod from a direction orthogonal to the moving direction of the rod / wire rod. It has an optical body, a photoreceptor to which light other than the light blocked by the rod or wire at the approximate center is incident, and a calculator that measures the diameter of the rod or wire from the amount of light received by the photoreceptor. By doing so, it is possible to non-contactly and accurately measure the diameter, size, shape and changes thereof due to the tension of a rod / wire moving at high speed, thereby making it possible to measure the rod / wire during movement. This has a remarkably excellent effect that the tension applied to the device can be accurately detected online.

Further, as described in claim 5, the light projecting body and the light receiving body of the rod / wire rod cross-sectional shape measuring apparatus are rod-shaped and rod-shaped.
By rotating integrally with the wire as a center, by measuring the shape of the rod and wire,
A remarkably excellent effect is obtained in that it is possible to measure the diameter, size, shape and change of the rod and wire in a non-contact manner.

And, as described in claim 6,
The rod / wire rod cross-sectional shape measuring device is provided with two or more light emitting directions different from each other at equal angles, so that the diameter / dimension / shape of the rod / wire rod and their changes are provided. Has a remarkably excellent effect that can be measured more accurately.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a method for detecting the tension of a rod or wire according to the present invention.

FIG. 2 is an explanatory front view of the rod and wire cross-sectional shape measuring device shown in FIG.

FIG. 3 is a graph showing a measured value of a diameter change due to a tension, which is obtained in advance, and a detected value of a tension according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a change in diameter of a rod or wire due to tension when the tension applied to the rod or wire is small.

FIG. 5 is an explanatory diagram showing a change in diameter of a rod or a wire due to tension when the tension applied to the rod or a wire is large.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 rod / wire rod 2U Upper rolling roller or drawing die at front stage 2D Lower rolling roller or drawing die at front stage 3U Upper rolling roller or drawing die at rear stage 3D Lower rolling roller or drawing die at rear stage 4 Rod・ Wire cross-sectional shape measuring device T tension

Claims (6)

[Claims] When detecting the tension applied to a rod / wire moving in a longitudinal direction, a shape change due to the tension of the rod / wire is measured by using a rod / wire cross-sectional shape measuring apparatus, and the tension is determined in advance. A method for detecting a tension applied to a rod / wire moving in the longitudinal direction from data on a shape change due to the tension of the rod / wire in question. 2. A rod / wire rod cross-sectional shape measuring device
The dimensional change due to the tension of the wire rod is measured, and the tension applied to the rod / wire rod moving in the longitudinal direction is detected from data of the dimensional change due to the tension of the rod / wire rod determined in advance. For detecting the tension of rods and wires. 3. A rod / wire rod cross-sectional shape measuring device using a rod / wire rod cross-sectional shape measuring device.
2. The method according to claim 1, further comprising: measuring a diameter change due to a tension of the wire, and detecting a tension applied to the rod or the wire moving in the longitudinal direction from data of a diameter change due to the tension of the rod or the wire determined in advance. For detecting the tension of rods and wires. 4. A rod / wire rod cross-sectional shape measuring apparatus includes: a light emitter for emitting light toward a rod / wire rod from a direction perpendicular to a moving direction of the rod / wire rod; 4. The apparatus according to claim 1, further comprising a photoreceptor for receiving light other than the intercepted light, and a calculator for measuring the diameter of the rod or wire from the amount of light received by the photoreceptor. A method for detecting the tension of rods and wires. 5. The rod / wire rod shape measuring apparatus according to claim 4, wherein the light projecting body and the light receiving body of the rod / wire rod sectional shape measuring device measure the shape of the rod / wire rod by integrally rotating around the rod / wire rod. For detecting the tension of rods and wires. 6. The rod / wire rod tension detecting apparatus according to claim 4, wherein the rod / wire rod cross-sectional shape measuring device is provided with two or more rods / wire rods whose emission directions of light are different from each other at equal angles. Method.