JP2550675Y2 - Jig for straightening metal wire - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a straightening jig for straightening an end of a metal wire having a constant curvature in the manufacture of a metal wire such as steel cord.

[0002]

2. Description of the Related Art A wire such as steel cord is manufactured by drawing a coil-shaped steel wire having a predetermined curvature as a raw material, and the like. A plurality of coil-shaped steel wires are manufactured. In order to process continuously, the ends of the coil-shaped steel wire are welded and integrated to perform continuous processing. The welding of this steel wire rod holds the vicinity of a pair of ends of the wire rod with a clamp,
The ends are butted by electric welding. However, since the wires cannot be accurately butted with the curvature, welding is performed after straightening the ends of the wire.

[0003] As a conventional straightness correction method for straightening the end portion of a wire, straightening is performed by using pliers or a wire W is passed through a hole 11 formed in a rod-shaped jig 10 as shown in FIG.
Straightening was performed repeatedly at several locations near the end of the wire rod. However, in these methods, since the bending is performed locally near the end of the wire, accurate straightness cannot be obtained. For this reason, there is a problem that a step is generated in the butt welded portion at the end portion of the wire, and the wire is broken in the drawing process.

[0004]

The problem to be solved by the present invention is that a straightening jig which can be straightened with a single operation with high accuracy without repeating local bending at the end of the wire as in the prior art. It is to provide.

[0005]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a straightness correction jig including a wire bending portion, a wire support portion, and a grip portion, and the outer peripheral side of the semicircular bending portion. A groove for guiding a metal wire is formed on the straightness correction jig of the metal wire, wherein a recessed hole connected to the groove is formed in the wire support portion, and preferably, the metal wire is guided. The groove is a straightness correction jig having a width slightly larger than the diameter of the wire and a length of the wire required for the welding process, and having a predetermined curvature continuously in the length direction.

[0006]

According to the present invention, the tip of a metal wire for straightness correction is inserted into a recessed hole located at one end of a guide groove, so that it can be used as a support point for bending work applied to the wire. . Then, the curvature of the guide groove of the straightness correction jig and the curvature of the coil of the wire are set to face each other in the opposite direction, and then the wire is continuously bent by bending the wire along the groove. It can be straightened.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically based on embodiments. FIG. 1 is a front view of the straightness correction jig 1 of the present invention, and FIG. 2 is a partially cutaway side view thereof. The straightness correction jig 1 according to the embodiment of the present invention includes a bent portion 2, a support portion 3, and a grip portion 4 as illustrated. And
Specifically, the bent portion 2 length 220 mm, curvature is 80mm semicircular grooves 2 ₁ of 5.5mm width on the outer periphery thereof
Are formed. The groove 2 ₁ is a portion where the wire fits. Also, a support portion 3 located at the tip of the processing portion 2,
That is, the portion used for supporting the leading end of the wire rod is the groove 2 _1.
It has a hole 3 ₁ to contact, the diameter of the hole 3 ₁ depth 5.5mm is 3 mm. Further, the grip part 4 opposite to the support part 3 has a length of 550 mm, and the jig 1 is made by machining ordinary steel.

Using the jig 1 of the present invention, the wire diameter is 5.5.
The end of a high carbon steel wire having a curl of 200 mm in diameter and having a diameter of 200 cm was straightened as shown in FIG. That is,
Insert the end of the wire W in a recess hole 3 ₁ of the supporting portion 3 of the jig 1, in the direction opposite to the curvature of the working portion 2 after setting the direction of curvature of the wire W, the wire W to the processing unit the ends of the grooves 2 ₁ along bending (arrow) to the wire W was true fix. Incidentally, at the end of the straightening the wire W, the portion that is inserted into the hole 3 in _1, correction was cut 10mm from the tip because it is not sufficiently performed.

In the conventional example, the end of the wire W is inserted into a hole 11 formed in a rod-shaped jig 10 shown in FIG. Then, a bending process was performed by hand, and the tip 10 mm was cut in the same manner as in the example.

The straightness of the wire W was evaluated by measuring the height h with respect to the length of the wire 60 mm when the wire W was placed on a plane as shown in FIG. In particular, the goal of straightness required by welding butting of wires is that the height h is 0.
It is 2 mm or less.

As a result, in the conventional method, the abutting step difference is about 0.5 mm, which has a large variation, but is less than 0.2 mm in the embodiment of the present invention. still,
In the present invention, the curvature of the processed portion of the jig can be suitably set to be straight by appropriately setting it in accordance with the diameter of the wire to be processed and the curvature of the coil.

[0012]

As described above, according to the straightness correction jig of the present invention, it is possible to straighten the end of a wire quickly and easily without requiring special skills as in the prior art. It can be done. Therefore, it is possible to prevent the displacement of the welded joint between the wires, and in the processing such as drawing in a subsequent step, the disconnection at the welded portion can be prevented, and there is a great industrial merit.

[Brief description of the drawings]

FIG. 1 is a front view of the straightness correcting jig of the present invention.

FIG. 2 is a partially cutaway side view of the straightness correcting jig of FIG. 1;

FIG. 3 is a perspective view showing an example of use of the straightness correcting jig of the present invention.

FIG. 4 shows an evaluation method of straightness of a wire.

FIG. 5 is a perspective view of a conventional straightness correction jig.

[Explanation of symbols]

1 ‥‥ straightness correcting jig, 2 ‥‥ bent portion, 2 ₁ ‥‥ groove, 3 ‥‥ support portion, 3 ₁ ‥‥ hole, 4 ‥‥ gripper, of 10 ‥‥ conventional straightness correcting jig , W ‥‥ wire.

Claims (2)

(57) [Scope of request for utility model registration] 1. A straightness correction jig comprising a wire bending portion, a wire support portion, and a grip portion, wherein a groove for guiding a metal wire is formed on an outer peripheral side of a semicircular bending portion. A straightness correction jig made of a metal wire, wherein a hole connected to the groove is formed in the wire support portion. 2. A groove for guiding a metal wire has a width slightly larger than the diameter of the wire and a length of the wire required for a welding process, and is provided with a predetermined curvature continuously in the length direction. The jig for correcting straightness of a metal wire according to claim 1.