JP2979890B2 - Apparatus and method for adjusting hardness of wire rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire hardness adjusting device and a wire hardness adjusting method, and more particularly, to a wire hardness adjusting device and a hardness adjusting device capable of changing the tensile strength and elongation characteristics of a wire in a stepless manner. About the method.

[0002]

2. Description of the Related Art In the manufacturing process of a wire, the hardness of the wire is adjusted in order to obtain a hardness having a tensile strength and an elongation according to the use of the wire. This operation is currently performed using an apparatus as shown in FIG. This apparatus comprises a bending roll portion 3 composed of a plurality of rolls 9 arranged in two rows at predetermined intervals, an annealing device 2 provided in a preceding stage of the bending roll portion 3, and a take-up cap provided in a subsequent stage. And a stan 4.

In the method of adjusting the hardness of a wire rod by the above-described apparatus, first, a wire rod 1 is annealed by an annealing device 2 to be a soft wire rod. Next, the wire 1 is stretched over the rolls 9 in the bending roll portion 3, the wire 1 is taken up at a predetermined speed using the take-up capstan 4, and the wire is bent. By this bending, the wire is hardened to form a semi-hard wire. When the wire is adjusted to have a predetermined tensile strength or elongation by the above method, the adjustment is performed by changing the number of rolls 9 to be wound. That is, when it is desired to increase the tensile strength and reduce the elongation, the number of rolls 9 in the bending roll part 3 is increased. On the other hand, when it is desired to reduce the tensile strength and increase the elongation, the number of rolls 9 is increased. Less.

[0004]

However, as described above, in the conventional wire hardness adjusting device, the hardness of the wire is adjusted by increasing or decreasing the number of rolls around which the wire is wound. The strength and elongation cannot be adjusted steplessly. Therefore, it has been difficult to manufacture a wire that requires high accuracy.

The number of rolls used depends on the type of wire, the diameter of the wire, and the required hardness. Therefore, when manufacturing a large number of wires having different characteristics, a roll suitable for adjusting the hardness of each wire is required. It is necessary to investigate the number in advance. Therefore, the production of many types of wire rods required a great deal of labor.

Accordingly, it is an object of the present invention to provide a wire rod hardness adjusting device and a method for adjusting the tensile strength and elongation of the wire rod which can be adjusted steplessly.

Another object of the present invention is to provide a wire hardness adjusting device and a wire adjusting method capable of improving productivity without being affected by the wire type, wire diameter and required hardness of the wire. It is in.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first and a second roll train comprising a plurality of rolls arranged in parallel with a traveling direction of a wire rod. Detecting means for detecting elongation of the wire rod, which is alternately stretched over each of the two roll rows and is pulled in the advancing direction and advances, and rows of the first and second roll rows according to the elongation There is provided a hardness adjusting device for a wire rod, comprising: control means for controlling a bending angle at which the wire rod is bent by each roll by increasing or decreasing an interval.

The present invention also relates to a first and a second roll row composed of a plurality of rolls arranged in parallel with the traveling direction of the wire rod, alternately hanging the wire rod and pulling the wire rod in the traveling direction. A bending process in which the wire rod is bent by each roll of the roll row by detecting the elongation of the wire rod pulled in the traveling direction and increasing or decreasing the interval between the first and second roll rows in accordance with the elongation. Provided is a method for adjusting the hardness of a wire, characterized by controlling an angle.

[0010]

According to the present invention, a wire drawn at a predetermined speed is stretched over first and second roll portions arranged at a predetermined interval to perform a bending process. At this time, the elongation percentage of the wire is calculated using speed sensors provided on both sides of the first and second roll portions. Then, based on the elongation obtained as a result of the calculation, the interval between the first and second roll portions is adjusted to change the bending angle of the wire, thereby changing the degree of work hardening. As a result, a wire having a specific tensile strength or elongation can be obtained.

When the distance between the first and second roll fixing portions is widened, the bending angle of the wire becomes small, and the wire having high tensile strength and low elongation can be obtained. on the other hand,
When the distance between the first and second roll fixing portions is reduced, the bending angle of the wire becomes large, and the tensile strength is weak, and a wire having a large elongation can be obtained.

[0012]

Embodiment 1 An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a wire hardness adjusting device according to the present embodiment. This apparatus includes an annealing device 2 for annealing a wire 1 into a soft wire and a bending roll 3 for bending the annealed wire 1 with a plurality of rolls 9.
And a take-up capstan 4 for picking up the wire 1, a speed sensor 5a, 5b provided on both sides of the bending roll unit 3 for detecting and outputting a wire speed of the wire 1, and an output of the speed sensors 5a and 5b. It comprises a calculating means 6 for calculating the elongation rate of the wire 1 and a motor control section 7 for adjusting the interval between the plurality of rolls 9 of the bending roll 3 based on the elongation rate calculated by the calculating means 6. .

The bending roll section 3 includes a first roll fixing section 10 and a second roll fixing section 11 for arranging and fixing a plurality of rolls 9 in parallel to the wire 1, and a second roll fixing section 11.
Of the second roll fixing portion 1
The three guide pins 12 that enable the first roll fixing unit 10 to move between the first roll fixing unit 10 and the large diameter portion 12a, and the first and second roll fixing units are driven by driving the first roll fixing unit 10. And a drive motor 8 for adjusting the distance between the means 10 and 11.

The apparatus for adjusting the hardness of a wire according to the embodiment described above is used as follows. In addition, since this apparatus adjusts the hardness (tensile strength, elongation) of a wire by bending, there is a limit in work hardening and is applied to a semi-hard wire having a relatively low hardness.

First, the wire 1 taken up at a predetermined speed by the take-off capstan 4 is annealed by an annealing device 2 to be a soft wire and introduced into the bending roll 3.

In the bending roll section 3, the wire 1 is subjected to work hardening by bridging the wire 1 over each of the plurality of rolls 9 and performing bending, thereby obtaining a predetermined hardness.

Here, the degree of work hardening that the wire 1 receives depends on the distance between the first and second roll fixing means 10 and 11. Therefore, by adjusting this interval, the tensile strength and elongation characteristics of the wire 1 can be changed. Therefore, next, the first and second roll fixing means 1
A method for adjusting the interval between 0 and 11 will be described.

First, the linear velocity before and after the wire rod 1 is bent is detected by the velocity sensors 5a and 5b provided on both sides of the bending roll portion 3. In this case, when the wire 1 is bent and work-hardened by using the plurality of rolls 9, an excessive tension is applied to the wire 1. Therefore, the wire 1
Is stretched by plastic deformation, so that the wire speed of the wire 1 differs before and after bending.

Next, the operation unit 6 controls the speed sensors 5a and 5b.
The amount of movement of the wire per unit time is determined from the line speed detected by the above, and the elongation is determined by taking the ratio of the amount of movement of the wire before and after bending. The relationship between the elongation percentage and the tensile strength and elongation of the wire is determined by the wire type without regard to the size of the wire.

Then, the first and second roll fixing portions 1
The elongation percentage is input to the motor controller 7 in which data indicating the relation between the elongation percentage, the tensile strength, and the elongation for the intervals of 0 and 11 is stored. Thereby, based on the data, the first and second roll fixing means 1 are driven by the drive motor 8.
0 is driven.

When the distance between the first and second roll fixing means 10 and 11 is widened by the drive motor 8, the bending angle θ of the wire 1 by the roll 9 becomes small, the tensile strength is high, and the wire has low elongation. Can be obtained. Meanwhile, the first
When the interval between the second roll fixing means 10 and 11 is reduced, the bending angle θ of the wire 1 by the roll 9 increases, and a wire having low tensile strength and high elongation can be obtained.

The roll 9 of the bending roll section 3
Can be changed according to the range of tensile strength and elongation of the semi-hard wire to be manufactured.

[0023]

As described above, according to the wire hardness adjusting apparatus and the wire adjusting method of the present invention, since the interval between the first and second roll means can be adjusted, the tensile strength and elongation of the wire can be reduced. Can be adjusted steplessly.

Further, since the interval between the first and second roll means can be adjusted, it is not necessary to increase or decrease the number of rolls depending on the type of wire, the diameter of the wire and the required hardness, thereby improving the productivity of the wire. be able to.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional wire rod hardness adjusting device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Wire 2 Annealing device 3 Bending roll part 4 Take-up capstan 5a, 5b Speed sensor 6 Computing unit 7 Motor controller 8 Drive motor 9 Roll 10 First
Roll fixing portion 11 Second roll fixing portion 12 Guide pin 12a Large diameter portion

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21F 1/00 C21D 7/10

Claims (3)

(57) [Claims] A first and a second roll row composed of a plurality of rolls arranged in parallel with a traveling direction of a wire rod; Detecting means for detecting elongation of the wire rod which is pulled in the advancing direction and which advances; and increasing or decreasing a row interval between the first and second roll rows in accordance with the elongation, whereby the wire rod is bent by each of the rolls. A wire rod hardness adjusting device comprising a control means for controlling a bending angle. 2. The apparatus according to claim 1, wherein the detecting unit includes a linear velocity meter that detects a linear velocity at an entrance and an exit of the first and second roll rows, and the control unit calculates the elongation from the linear velocity. 2. The wire hardness adjusting device according to claim 1, further comprising a circuit and a moving means for moving the first or second roll row in a direction orthogonal to the traveling direction by the elongation. 3. The wire rod is alternately laid on each of a first and a second roll row composed of a plurality of rolls arranged in parallel with the traveling direction of the wire rod and pulled in the traveling direction, and is pulled in the traveling direction. The bending angle at which the wire rod is bent by each roll of the roll row is controlled by detecting the elongation of the wire rod, and increasing or decreasing the row interval between the first and second roll rows in accordance with the elongation. A method for adjusting the hardness of a wire rod.