JP3243938B2 - Mechanical descaling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mechanically removing scale from the surface of a metal wire, and more particularly to a mechanical descaling apparatus for removing scale by twisting a metal wire.

[0002]

2. Description of the Related Art Metal wires are exposed to a high-temperature oxidizing atmosphere during the manufacturing process, so that scale adheres to the surface thereof. This scale, for example, causes die seizure in the wire drawing in the next step, so it is necessary to remove the scale as completely as possible.

[0003] Mechanical descaling methods include:
A reverse bending method in which a traveling wire is passed through several rollers and repeatedly bent back is generally used, but in this reverse bending method, repeated bending and returning of a wire cannot be performed uniformly in all circumferential directions. The problem that unscaled portions are generated in some parts remains. Therefore, as an improvement of the reverse bending method, the metal wire is forcibly turned around its axis and twisted while running the metal wire, and the scale is removed using the difference in toughness between the metal wire and the scale. Has been put to practical use.

[0004]

However, in the above-mentioned torsion type mechanical descaling device,
Although it is necessary to provide a torsional propagation prevention unit for preventing the propagation of torsion at least at the preceding stage, the configuration of this torsional propagation prevention unit has not been established. For example, as shown in FIG. 8, the torsion propagation preventing portion includes pinch rollers 41, 42 that sandwich the metal wire 40 at two places, and a pressing roller 43 that is arranged between the pinch rollers 41, 42 and applies a load to the metal wire 40. , 44 and 45, there is a problem that the surface of the metal wire passing through each press roller is flawed.

This is because the diameter of each pressure roller is as small as about 40 mm, and the contact length between the metal wire and the pressure roller is short, so that a sufficient contact area cannot be secured. In such a configuration, as a result, the contact surface pressure between the metal wire and the pressing roller is increased, that is, the state is close to point contact, and a flaw is formed on the surface of the metal wire. Further, it is necessary to prevent the propagation of the twist by changing the pushing amount of the pressing roller 44 every time the wire diameter and the wire strength of the metal wire change, and the adjustment is extremely difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is capable of preventing the propagation of torsion without damaging a metal wire at the time of mechanical descaling and requiring no adjustment. It is an object to provide a descaling device.

[0007]

According to the present invention, there is provided a torsion generating portion configured to turn a displacement traveling portion for curving and traveling a metal wire along a peripheral surface of a roller around an axis in a direction of transport of the metal wire, A torsion propagation preventing portion provided upstream of the torsion generating portion and restraining the metal wire in a running state to prevent the propagation of torsion. A first roller (upstream side) and a second roller whose axes are arranged in a substantially triangular shape so as to make a U-shaped detour.
A mechanical descaling device having a roller and a third roller (downstream side), wherein the third roller has a contact length of 94 mm or more with the metal wire. In the present invention, the contact length is obtained by a roller having a diameter of 120 mm or more and a contact angle with a metal wire of 90 ° or more.

[0008]

According to the present invention, the running metal wire is forcibly turned around its axis, and the metal wire twists due to its sufficient toughness, but the scale adhering to its surface is hardly any. Since it has no toughness, it cannot follow the torsion, and as a result, a peeling force acts between the two to cause the scale to fall off. The torsion propagation preventing portion provided on the upstream side of the torsion generating portion acts to prevent the torsion given to the metal wire from propagating to the metal wire supply side.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows a schematic configuration of a mechanical descaling device 10 of the present invention and a dice box 20 disposed at a subsequent stage. In the figure,
The mechanical descaling device 10 mainly includes a straightening box 11 for applying tension, a twist propagation preventing unit 12, and a twist generating unit 13. The wire 30 to which the tension is applied is given a twist turning in the direction of arrow A by the twist generator 13, but since the twist propagation preventing member 12 is arranged on the upstream side, the applied twist is shifted on the upstream side. The metal wire (hereinafter simply referred to as a wire) 30 does not propagate, and therefore, exits the mechanical descaling device 10 with the twist fixed on one side (upstream side), enters the die box 20, and is drawn. It has become.

Next, the configuration of each section will be described in detail.
FIGS. 2 to 4 show examples of the above-mentioned torsion generator 13.
31 (see FIG. 2), 132a to 132c (see FIG. 3),
133a and 133b (see FIG. 4), and a center guide roller 134 for guiding the wire 30 so that it does not deviate from the axis of the casing 130 is provided at the inlet end and the outlet end of the casing 130. .

Since the gear 135 provided at one end of the casing 130 is connected to the motor 137 via the transmission gear 136, the casing 130 can turn in the direction of arrow A in each of the examples shown in FIGS. it can. Therefore, FIG.
Rollers 131, 132a to 132 shown in FIGS.
c, 133a and 133b are also turned in the direction of arrow A accordingly. Note that the wire displacement roller 133 shown in FIG.
a and 133b are connected by a connection bar 138 so that each roller can rotate in the opposite direction.

FIG. 5 shows the structure of the torsional propagation preventing portion which is a feature of the present invention. In FIG. 1, the torsional propagation prevention unit 12 includes a first roller 120, a second roller 121, and a third roller 122 whose axes are arranged in a substantially triangular shape so as to bypass the traveling wire 30 in a substantially U-shape. The second roller 121 is disposed substantially at the middle of the first roller 120 and the second roller 122 and at a position separated from the travel path of the wire 30 (dashed line RL in the drawing).

The first roller 120 and the second roller 12
The diameters of the first and third rollers 122 are 75 mm and 120 mm, respectively.
mm and 120 mm, and both have fixed shaft portions.
According to the torsion propagation preventing portion 12 having such a roller arrangement, the wire 30 travels in a U-shaped detour, so that the torsion propagation can be performed without adjusting the pushing amount by using the conventional pressing roller. Can be prevented. Further, the “twist” transmitted from the torsion generator 13 directly acts on the third roller 122, and the third roller 122 is formed to have a larger roller diameter than the conventional one. Moreover, since the contact length between the wire 30 and the third roller 122 is sufficiently long, the wire 30 can travel on the third roller 122 having a large contact area with a small contact surface pressure. It is possible to prevent the surface of the wire 30 from being flawed. Table 1 shows the result of examining the relationship between the roller diameter and the contact angle.

[0014]

[Table 1]

As can be seen from Table 1, flaws occur when the contact angle is small even when the roller diameter is large, and flaws occur when the contact angle is large when the roller diameter is small. Therefore, in order to determine the specifications of the pressure roller (second roller),
It is necessary to define both the roller diameter and the contact angle as follows.

That is, it is necessary to satisfy roller diameter ≧ φ120 mm and contact angle ≧ 90 °. Under this condition, as can be seen from FIG. 6 showing the relationship between the roller diameter and the contact angle with respect to the contact angle, A length of 94 mm or more is secured. Note that even when the roller diameter is φ100 mm and the contact angle is 120 °, no flaw is generated, but the practicability is low, and therefore, it is excluded from the specification. Reference numeral 123 shown in FIG.
The case where the above-mentioned φ200 mm roller is arranged is shown.

FIG. 7 shows another embodiment of the mechanical descaling device, in which two torsion generators 14 and 15 are arranged on the downstream side of the torsion propagation preventing unit 12. In this configuration, the torsion generator 1 on the upstream side
4 is configured to turn in the opposite direction and at a low speed to the downstream side twist generating member 15. Therefore, the scale of the surface of the wire 30 to which the + side twist has been applied in the upstream side twist generating section 14 is removed, and the downstream side twist generating section 1 is further removed.
At 5, the − side twist is applied, and the scale remaining on the surface of the wire 30 is completely removed, and the twist is canceled. A torsional propagation prevention unit 12 similar to the configuration shown in FIG. 5 is provided further upstream of the torsional generating member 14 on the upstream side, and prevents torsional propagation to the upstream side.

In the present invention, the torsional propagation preventing section 12 is arranged on the upstream side of the torsional generating section 14, but may be arranged on both sides of the torsional propagation preventing section 12. In the present invention, the predetermined contact length is defined by the roller diameter and the contact angle. However, the present invention is not limited to this, and can be directly defined by the contact length.

[0019]

As is apparent from the above description, according to the present invention, it is possible to prevent the propagation of torsion without damaging the metal wire at the time of mechanical descaling, and to press the pressing roller. There is an advantage that there is no need to adjust the amount.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a mechanical descaling device of the present invention.

FIG. 2 is an explanatory diagram showing a first configuration of a torsion generator shown in FIG. 1;

FIG. 3 is an explanatory diagram showing a second configuration of the torsion generator shown in FIG. 1;

FIG. 4 is an explanatory diagram showing a third configuration of the torsion generator shown in FIG. 1;

FIG. 5 is an explanatory diagram illustrating a configuration of a torsional propagation prevention unit illustrated in FIG. 1;

FIG. 6 is a table showing a relationship between a roller diameter and a contact angle according to the embodiment.

FIG. 7 is a schematic configuration diagram showing another embodiment of the present invention.

FIG. 8 is an explanatory diagram showing a configuration of a conventional torsional propagation prevention unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mechanical descaling apparatus 11 Correction box for tension addition 12 Torsion propagation preventing unit 13 Torsion generating unit 14 Upstream torsion generating unit 15 Downstream torsion generating unit 20 Die box 30 Wire rod 120 First roller 121 Second roller 122, 123 Third roller

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B21C 43/04

Claims (2)

(57) [Claims] 1. A torsion generating section configured to turn a displacement traveling section for curving and traveling a metal wire along a peripheral surface of a roller around an axis in a direction of transport of the metal wire, and an upstream side of the torsion generating section. And a torsion propagation prevention unit that restrains the metal wire in a running state and prevents torsion propagation, wherein the torsion propagation prevention unit bypasses the traveling metal wire in a substantially U-shape. The first roller (upstream side) and the second
A mechanical descaling device comprising a roller and a third roller (downstream side) , wherein the third roller has a contact length of 94 mm or more with the metal wire. 2. The mechanical descaling device according to claim 1, wherein the contact length is obtained by a roller having a diameter of 120 mm or more and a contact angle with the metal wire of 90 ° or more.