JPH0128657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for straightening the bends of a metal wire by pulling the wire with a grip feed or the like and passing the wire through the device.

(Prior Art) A conventional device for straightening the bending of a metal wire is one in which the heads of a plurality of rotating rollers or fixed pieces are brought into pressure contact with the wire being pulled through the device.
The roller or piece is in constant pressure contact with the outer peripheral surface of the wire that is parallel to the axis of the wire.

(Problems to be Solved by the Invention) Therefore, in this conventional straightening device, the pressure of the rotating roller or the fixed piece cannot be said to be uniform over the entire outer periphery of the wire, and in the straightening structure using pressure of the rotating roller, the wire Because the pressure welding length is short and the contact resistance with the wire is small, sufficient straightening force cannot be obtained.Furthermore, with the straightening structure by pressure welding of the fixed piece, it is troublesome to replace and adjust the head of the piece when it wears out. There was a problem.

In view of the above points, this invention effectively corrects the bending of the metal wire by applying pressure uniformly in a spiral shape to the entire outer periphery of the wire to be stretched, and also makes it easy to adjust when the pressure contact surface becomes worn. An object of the present invention is to provide a device for straightening the bending of a metal wire having a straightening roller.

(Means for Solving the Problems) As shown in the drawings corresponding to the embodiments, the device for correcting the bending of a wire rod according to the present invention is provided with two opposing support frames 24 and 31 that are rotatably driven in the same manner. first and second hollow shafts 25, 34 supported on the axis; and the first and second hollow shafts 25,
34, the left and right roller receivers 26, 35 and the first and second arms 28, 37
a support arm member formed by a support arm member, and a plurality of correction rollers 27, 29, which are pivotally supported by the support arm member.
30, 36, 38, and a correction roller whose outer periphery presses against the wire W stretched through the inner space of the first and second hollow shafts 25, 34, and the correction roller At least one of the polygonal shapes has a polygonal shape, and each side of the polygonal shape is an arcuate shape having a radius of curvature larger than that of a circular arc whose radius is the shortest length from the axial fulcrum of the roller. It is said that

(Operation) The metal wire W to be straightened is pulled through the interior spaces of the first and second hollow shafts 25 and 34, and in this state, the first and second hollow shafts 25 and 34 are driven to rotate. Then each correction roller 27, 29, 30, 3
6 and 38 rotate in the circumferential direction of the wire W with one side of the polygon in pressure contact with the outer periphery of the wire W.

Then, the wire rod W advances in a fixed direction while being pressed against the sides of each straightening roller in a spiral shape, and as a result, a spiral residual stress distribution is created in the cross section of the wire rod W around the elastic core C, as shown in FIG. 5B. D, and the tensile compression on the wire is equalized over the entire circumference of the wire.

Furthermore, if the pressure contact side of the correction roller is worn out, it is sufficient to rotate it and reinstall it so that the other side touches the wire.

(Example) The present invention will be described below with reference to an example shown in the drawings.

FIG. 1 is a front view showing the entire wire processing apparatus having a second wire straightening device as a device for straightening bends in wire according to the present invention, and FIG. 2 is a plan view thereof. This wire processing device is, for example, a bobbin B.
Insert the wound wire W into the device, clamp and feed the wire W, and rotate at a fixed position with respect to the feeding direction (downstream direction) of the wire W to move the wire in the vertical and horizontal directions. A first wire straightening device 1 having a large number of rotating straightening rollers 18 for performing bending processing
and a second wire straightening device 2 which is located downstream of the first wire straightening device 1 and rotates around the transfer center of the wire W to straighten the bent wire while feeding it. , provided downstream of the second wire straightening device 2 and on a wire transport path connecting the wire transport centers of the first and second wire straightening devices 1 and 2, the first and second gripper devices 3 ,4
etc., and continuously pulls and feeds the wire to the downstream side of the wire straightening device, clamps and unclamps the wire W by at least the first or second gripper devices 3 and 4, and leaves the wire W in the clamped state. It is generally composed of a gripper feed device 5 for cutting into different lengths, and a motor 6 as a drive source for driving the second wire straightening device 2 and the gripper feed device 5.

Next, a second wire straightening device 2 as an embodiment of the present invention will be explained with reference to FIGS. 3 to 6.

A first hollow shaft 25 is supported on one support frame 24 with the horizontal direction as the axial direction.
The correction roller receiver 2 is attached to the collar 25a of the hollow shaft 25.
6 is removably fixed. This correction roller receiver 26 includes a disk portion 26a and a disk portion 26a.
two side plate portions 26b extending perpendicularly to the
26b, a correction roller 27 is pivotally supported between the side plate portions 26b, 26b, and a first arm 28 consisting of two opposing panels 28a, 28a is positioned diagonally above the correction roller 27. The first arm 28 is rotatably mounted around a correction roller 29 which is pivotally supported, and a correction roller 30 is pivotally supported on the rotation tip side of the first arm 28 .

On the other hand, the other support frame 31 facing the one support frame 24 has an opening 31a with a female thread formed on the inner periphery, and a sleeve 32 with a thread formed on the outer periphery is installed in this opening 31a. In addition to being screwed together, an adjustment handle 33 is provided at the outer end of the sleeve 32.
is fixed. Inside this sleeve 32 is a second
A hollow shaft 34 is supported, and the first hollow shaft 25 and the second hollow shaft 34 are opposed to each other on the same axis. Flange portion 3 of the second hollow shaft 34
4a includes a correction roller receiver 2 for the first hollow shaft 25.
A disc portion 35a of a correction roller receiver 35 similar to No. 6 is detachably attached. That is, the correction roller 36 is connected to the side plate portion 35 of the correction roller receiver 35.
A second arm 37 consisting of two panels 37a, 37a is rotatably mounted around a correction roller 38, which is supported obliquely above the correction roller 36. The rotating tip of the second arm 37 is connected to the rotating tip of the first arm 28 via the rotation shaft of the correction roller 30, as shown in FIGS. 3 and 4. As the sleeve 32 is screwed, the common correction roller 30 at the rotating tips of the first and second arms 28, 37 is rotated in the axial direction of the first and second hollow shafts 28, 34. In other words, it is movable in a direction perpendicular to the feeding direction of the wire rod W.

Here, the first and second arms 28, 34
To explain the straightening rollers 27, 29, 30, 36, and 38, they are arranged in a staggered manner along the feeding direction of the wire rod W, and as shown in Fig. 5a, the radius of curvature of a part of the outer circumference becomes large. approximately polygon,
In this embodiment, it has a substantially square shape, and a wire holding groove H is formed on its outer peripheral surface over the entire circumference.

Note that the pulley 39 fitted on the first hollow shaft 25
and a pulley 6a of the motor 6 are interlocked and connected via a belt V as shown in FIG.
4 are configured to rotate together.

Next, the operation of the above configuration will be explained.

First, the wire rod W wound around the bobbin B is passed through the wire rod processing apparatus shown in FIGS.
4, and each correction roller is positioned in a staggered manner along the axial direction around the outer circumference of the wire.

Next, adjust the adjustment handle 3 of the second wire straightening device 2.
3 from the state shown in FIG. 3 to the state shown in FIG.
7, 30, 36, 29, and 38, and by stopping the rotation of the adjustment handle 33, the wire W is bent between the first and second wires W.
The pulley 6a and the pulley 3 are pulled in the downstream direction (feeding direction, leftward in FIG.
9, the first and second hollow shafts 25, 34 are rotated around the transfer center of the wire rod W, and the wire rod W
The wire rod W is straightened by applying uniform bending over the entire circumference.

If the wire W is not straightened at this time, the adjustment handle 33 is rotated without stopping the rotation of the first hollow shaft 25 to increase or decrease the bending of the wire W. Adjustments can then be made.

By the way, in the above-mentioned straightening operation, if a circular small-diameter roller is used as the straightening roller, a sufficient straightening force cannot be obtained because the contact length with the wire W is short and the contact resistance is small. For this reason, in this embodiment, the radius of curvature of each side is made into a circular arc shape whose radius is the shortest length from the shaft fulcrum of the roller, and a wire holding groove H is provided on the outer periphery, so that the individual are polygonal correction rollers 27, 30, 3 that do not rotate.
6, 29, 38, the wire W can be moved by the straightening rollers 27, 30, 36, 2 during straightening.
9 and 38 while rotating, and are repeatedly bent during that time. That is, the wire W progresses in a helical motion sequentially from a portion near the rolls where the bending moment is large to a portion where the bending moment is small between the rolls. Therefore, as the wire rotates, the direction and magnitude of the bending moment applied to the cross section of the wire W increases or decreases. As a result, as shown in FIG. 5B, a spiral residual stress distribution D is generated in the cross section around the elastic core C, and the wire W is straightened.

In addition, each correction roller 27, 30, 36, 29, 3
If 8 becomes worn, simply rotate it 90 degrees and reinstall it.

(Effects) As explained above, according to the present invention, a polygonal correction roller that does not rotate but revolves in the outer circumferential direction of the wire W is attached to the outer periphery of the wire W being pulled in a predetermined direction. Since the bending of the wire W is corrected by pressing the sides, the outer periphery of the wire W advances while being pressed against the sides of the correction roller in a spiral shape while being subjected to large and small bending moments. Therefore, as shown in Fig. 5B, a spiral residual stress distribution D is generated in the cross section of the wire W around the elastic core C, and the tensile compression on the wire is equalized over the entire outer circumference, ensuring that the wire is straightened. There is a possible effect.

Furthermore, when the pressure contact side of the correction roller is worn out, it is only necessary to rotate it and reattach it so that the other side touches the wire, which has the effect of making the adjustment work extremely easy.

[Brief explanation of drawings]

FIG. 1 is a front view showing the entire wire processing device having a second wire straightening device as a device for straightening bends in a wire according to the present invention, FIG. 2 is a plan view of the same, and FIGS. FIG. 4 is a longitudinal sectional view of the second wire straightening device, FIG. 5A is an enlarged view of the straightening roller,
FIG. 5B is an explanatory diagram showing the stress distribution in the cross section of the wire after straightening, and FIG. 6 is a perspective view of the second wire straightening device. 24, 31... Support frame, 25... First hollow shaft, 34... Second hollow shaft, 27, 30, 36,
29, 38... Correction roller, 26, 35... Correction roller receiver.

Claims (1)

[Claims] 1. A first support frame 24, 31 that is rotatably supported on the same axis as the opposing support frames 24, 31.
and a second hollow shaft 25, 34, a support arm member provided across the first and second hollow shafts 25, 34, and a plurality of correction rollers pivotally supported by the support arm member. The first and second hollow shafts 25, 3
4, and at least one of the correction rollers has a polygonal shape, and each side of the polygonal shape is A device for straightening the bending of a wire, characterized in that it has a circular arc shape with a radius of curvature larger than that of a circular arc whose radius is the shortest length from the shaft fulcrum of the roller.