JPH0157977B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for shearing wire rods.

Conventionally, when extruding or hedging (including upsetting) a wire rod using a press or a header, the properties of the cut surface (for example, end face inclination, burrs,
Because scabs, sag, steps, etc.) have a negative impact on the dimensional accuracy, surface scratches, mold life, and formability of the molded product, a pre-fitting process is usually inserted between the shearing process and the forming process to straighten the cut surface. ing.

For example, in the mass production process of extrusion molded products using a press, the insertion of a pre-fitting process complicates the production process, and the resulting drop in production efficiency has been considered difficult to avoid.

An example of a conventional shearing method is as shown in FIGS. 1 to 3, in which a wire M supported by a support die 1 is penetrated by a shearing blade 2 which has returned to a position concentric with the insertion hole 1a by an appropriate means. It is inserted up to the upper end of the hole 2a. Next, shearing force is applied to the wire M by sliding the shearing blade 2 in the direction of arrow A using an appropriate means.
As a result, as shown in Fig. 2, the wire rod M during shearing
sag MA and MB are formed. Further, when the shearing blade 2 is slid in the direction of the arrow A shown in FIG. 2, the wire M is sheared along the shear line MN.
Next, as shown in Fig. 3, when the sheared wire SM is transferred above the discharge pin 3 by the shear blade 2, the discharge pin 3 is raised by an appropriate means and the sheared wire SM is discharged from the shear blade 2 to the outside. let After that, the raised discharge pin 3 is lowered to its original position, and the shear blade 2 is returned to the position shown in FIG.
The same shearing process as described above is repeated on the wire M again.

In this case, as shown in Fig. 4, the sheared wire SM has a burr MC formed on the upper cut surface MF at a position opposite to the sag MA, and a burr on the lower cut surface MG.
Since the sag MB is formed at a position opposite to the MC, the above-mentioned adverse effects occur, and the above-mentioned pre-attaching process is required.

In view of the above-mentioned situation, an object of the present invention is to
The purpose of the present invention is to provide a shearing method that can perform pre-assembly and shearing in one step, and the gist of the method is to cut a wire protruding from an insertion hole of a support die into a shearing process that corresponds to the cross-sectional shape of the wire. In the processing method of shearing using a shearing blade equipped with a hole, after inserting the wire into the through hole, the through hole of the shearing blade is rotated around the axis of the wire, and then the shearing blade is aligned with the axis of the wire. The purpose is to shear the wire by moving it in a direction perpendicular to the core.

Next, a configuration example of a shearing device to which the shearing method of the present invention is applied will be explained based on FIGS. 5 and 6.

11 is a support die for the wire M, 12 is a shearing blade that moves in a direction perpendicular to the axis of the wire M, and in the center,
A through hole 12a corresponding to the cross-sectional shape of the wire M into which the wire M is inserted is bored at a position slightly offset from the center of the shearing blade 12. To allow the through hole 12a of the shear blade 12 to rotate around the axis of the wire M, a tooth portion 12b that meshes with the drive gear 13 is carved on the side surface thereof. 14
15 is a lower case supporting the drive gear 13, and 15 is an upper case supporting the drive gear 13, in which a discharge hole 15a for the sheared wire SM is bored in the center.
Both cases 14 and 15 are fixed with bolts (not shown). 16 is a discharge pin and shear wire rod
Discharge SM to the outside.

The shearing method of the present invention using a shearing device having such a configuration is as shown in FIGS. 5 and 6. Blade 1
2 to the upper end of the through hole 12a. At the same time, the drive gear 13 is driven by a drive source (not shown).
When the shearing blade 12 is rotated in the direction of the arrow B shown in FIG. 6, the shearing blade 12 is rotated in the direction of the arrow A.

Then, at that time, the through hole 12a of the shearing blade 12
is arranged at a slightly eccentric position with respect to the shearing blade 12, the through hole 12a rotates in a spiral manner with respect to the axis of the wire M, and the fifth
As shown in the figure, there is a sag in the wire M on the shearing blade 12 side.
In the MB, a sag MA is formed over the entire circumference of the wire M on the supporting die 11 side.

In this state, if the cases 14 and 15 are moved in the direction of the arrow C in FIG. Wire M is sheared along shear line MN.

Then, when the shear wire SM is transferred above the discharge pin 16, the discharge pin 16 is raised by appropriate means and discharged to the outside through the shear blade 12 and the discharge hole 15a of the upper case 15. Then eject pin 1
6 is lowered to the original position, the through hole 12a of the shearing blade 12 is returned to the original position, and the same shearing process as described above is repeated on the wire M again.

As shown in Fig. 7, this sheared wire SM has almost uniformly shaped sags MA and MB formed around the entire periphery of both the upper cut surface MF and the lower cut surface MG, so the pre-attaching process described above is unnecessary. becomes. Furthermore, the shearing method of the present invention dramatically improves productivity in multi-stage press work in which shearing and subsequent extrusion molding are performed continuously, for example.

As described above, in the conventional shearing method, a sag is formed only on one side of the cut surface, whereas in the shearing method of the present invention, a uniformly shaped sag is formed around the entire periphery of the cut surface, Toga1
Can be implemented in the process. As a result, the conventional pre-fitting process is omitted, and together with reductions in setup processes, mold costs, mold accessory costs, etc., the technical effect of significantly improving production efficiency is significant.

[Brief explanation of drawings]

Figures 1 to 3 are drawings illustrating the conventional shearing method. Figure 1 is a sectional view showing the state in which the wire is inserted into the shearing blade, Figure 2 is a sectional view showing the state of the wire being sheared, and Figure 3 is the diagram illustrating the shearing method. FIG. 4 is a sectional view showing the discharge state of the sheared wire, and is an external view of the sheared wire. 5th ~
Fig. 6 is a drawing illustrating the shearing method of the present invention, Fig. 5 is a sectional view showing the sheared state of the wire, Fig. 6 is a sectional view taken along line A-A in Fig. 5, and Fig. 7 is a shearing process. It is an external view of a wire. 12...Shearing blade, M...Wire rod, SM...Shearing wire rod, MA, MB...Sag.

Claims (1)

[Claims] 1. A processing method in which a wire protruding from an insertion hole of a support die is sheared using a shearing blade having a through hole corresponding to the cross-sectional shape of the wire, comprising: inserting the wire into the through hole. After that, the through hole of the shearing blade is rotated around the axis of the wire, and then the shearing blade is moved in a direction perpendicular to the axis of the wire to shear the wire. Shear processing method. 2. The shearing method according to claim 1, which is applied to a multi-stage press operation in which shearing and subsequent forming are performed continuously.