JPH0796496A - Wire cutter - Google Patents

Abstract

PURPOSE:To efficiently and cleanly remove burrs of a product made of soft material. CONSTITUTION:Two wires 5 are stretched in a tensioned manner parallel to a rotary shaft with the angular space of 180 deg. in the eccentric position by the same distance from the axial center of the rotary shaft 1 between upper and lower mounting plates 2, 3 which are separately fitted to the rotary shaft 1, and a wire cutter is constituted thereby. The upper end part of the rotary shaft 1 is mounted on the lower end of a spindle 7. A handle (a) which is formed through the insert forming of the synthetic rubber is mounted on and fixed to a jig. Burrs (b) are cut and removed by the rotating wire 5 by placing the wire 5 of the wire cutter A on the outer circumferential surface of the handle (a) where the burrs (b) are projected, and executing one rotation of the wire cutter A around the rotary shaft 1 by driving the spindle 7 while moving the wire cutter A copying the outer circumference of the handle (a).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire cutter suitable for use in cutting a soft material product such as removing burrs formed on a rubber molded product.

[0002]

2. Description of the Related Art For example, a handle portion of an automobile handle is formed by injection molding of synthetic rubber into which a core metal is inserted. At that time, burrs are likely to be formed corresponding to the seams of the mold.

[0003]

Conventionally, the burr is removed manually by using a cutter, which is troublesome and difficult to finish the cut surface smoothly. It was

[0004]

The wire cutter of the present invention has been completed mainly based on such a situation, and the wire is attached to the spindle at an eccentric position of the spindle attached to the spindle. The tension was set approximately parallel to the axis.

[0005]

When the rotary shaft is attached to the spindle and the spindle is driven, the wire rotates at a high speed around the axis of the rotary shaft, and the high-speed rotating wire is applied to the burred portion of the soft material product to form a burr. Is effectively cut.

Further, not only deburring but also cutting is performed by contacting the outer surface of the soft material product.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the wire cutter A of this embodiment, as shown in FIG. 1, upper and lower mounting plates 2 and 3 are fitted to a lower end side of a rotary shaft 1 with a space therebetween, and a lower mounting plate 3 and an upper mounting plate 3 are mounted. Two wires 5 between the hook 4 fixed to
18 at the position eccentric to the axis of the rotary shaft 1 by the same size.
Tensioned in a posture parallel to the rotation axis 1 with an angular interval of 0 °.

The upper end of the rotary shaft 1 is attached to the lower end of a spindle 7 driven by an inverter motor (not shown).

In this embodiment, a piano wire having a wire diameter of 0.3 mm is used as the wire 5, and the eccentric dimension of each wire 5, that is, the turning radius of the wire 5 is 13 mm.

Next, an example in which the wire cutter A of this embodiment is used for deburring a steering wheel of an automobile will be described.

As shown in FIG. 2, the handle a whose grip portion is formed by insert molding of synthetic rubber has a processed plate 9
By mounting the central portion of the mounting jig 10 projecting upward, the workpiece 10 is fixed in a horizontal posture floating from the processing plate 9.

Then, as shown in FIG. 1, the wire 5 of the wire cutter A is applied to the outer peripheral surface of the handle a where the burr b is projected, and the wire cutter A itself is imitated on the outer periphery of the handle a and the arrow x in FIG. When the wire cutter A is rotated around the rotation axis 1 in the arrow y direction while moving in the direction, the burr b is cut off by the rotating wire 5.

In this case, when the peripheral speed of the wire 5 is variously changed by controlling the input frequency to the inverter motor and adjusting the rotational speed of the spindle 7, the smaller the peripheral speed is, the easier it is to follow the outer periphery of the handle a. The cutting surface is rough,
On the contrary, the higher the peripheral speed, the smoother the cutting surface becomes, but it tends to be difficult to follow. In such deburring, in order to follow the outer periphery of the handle a well and obtain a smooth cutting surface, It was confirmed that it is preferable to set the peripheral speed of the wire 5 to 100 to 150 m / min.

Next, the number of wires 5 is changed to 4 and 90 °
When tension was applied at intervals, it was confirmed that the cutting surface could be made smoother than when two pieces were used. However, when the number was too large, it was difficult to remove large burrs.

Further, when the radius of gyration of the wire 5 is reduced to 8 mm and compared with the case of 13 mm described above, there is a tendency that the case of 8 mm is easier to cut, and the case of 13 mm is more likely to follow the handle a. Although it was seen, it was confirmed that deburring can be performed even with 8 mm. In that case, the peripheral speed of the wire 5 is preferably 60 to 100 m / min.

Further, regarding the wire diameter of the wire 5, it is considered that a smoother cutting surface can be obtained as the wire diameter becomes smaller. At present, for example, a piano wire having a wire diameter of 0.1 mm has a problem in strength, but if the strength is cleared, it is preferable to use a wire having a thin wire diameter.

The present invention is not limited to the deburring of the handle a shown in the above embodiment, but can be widely applied to the general deburring of soft material products such as synthetic rubber and synthetic resin.

In addition to deburring, it can also be used for cutting the outer surface of a soft material product as described above. In that case,
It has been confirmed that it is preferable to set the peripheral speed of the wire 5 to 200 to 400 m / min when the turning radius of the wire 5 is 13 mm, and to 150 to 250 m / min when the turning radius is 8 mm. .

[0019]

As described above, when the wire cutter of the present invention is used, deburring of a soft material product and its own cutting process can be efficiently performed, and a smooth cutting surface can be finished. Further, the cutter itself has a simple structure in which the wire is tensioned at the eccentric position of the rotary shaft, and has an effect that it can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a partially cutaway plan view showing a usage state.

[Explanation of symbols] A: Wire cutter 1: Rotating shaft 2, 3: Mounting plate 5: Wire 7: Spindle

Claims (1)

[Claims] 1. A wire cutter, wherein a wire is tensioned at an eccentric position of a rotary shaft attached to a spindle in a direction substantially parallel to the axis of the rotary shaft.