JP2544858Y2 - Roll in bath for hot-dip metal plating - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll in a bath for hot-dip metal plating.

[0002]

2. Description of the Related Art
As shown in FIG. 5, in hot-dip metal plating such as aluminum plating, a steel strip 1 is subjected to groove cleaning in a pretreatment furnace 2 and is led to a hot-dip plating bath 3 to be subjected to a sink roll 4 and support rolls 5, 5a.
Is guided by a roll in the bath, and pulled up immediately after plating.

[0003] The holding of such a roll in the bath in the bath is as follows.
As shown in FIG. 6, the roll shaft 6 is held through the bearing 7 and
Are supported by hangers (not shown) or the like.

[0004] The above-mentioned roll in the bath is generally made of steel strip 1.
, And rotate while repeatedly moving in the roll width direction. As shown in FIG. 7, the roll end surface comes into contact with the bearing 7, and the roll rotates instantaneously (temporarily). The steel strip 1 slips, causing flaws,
The quality will be reduced.

In order to solve such disadvantages, for example,
As disclosed in Japanese Utility Model Laid-Open Publication No. 1-149458, a spiral groove is formed in the shaft, the bath (molten metal) is moved by the rotation of the roll (shaft), and the bath is forcedly retained between the roll end surface and the bearing. Although it is disclosed that contact with the bearing is prevented, this measure is not reliable.

[0006]

The feature of the present invention is that the contact point of the U-shaped bearing at the tip of the roll shaft is substantially in point contact.
A roll in a bath of a hot-dip metal plating, wherein the roll shaft is held in a U-shaped bearing, and is formed in a convex shape. And a molten metal plating bath roll in which a U-shaped bearing in which the inner wall of a contact portion of a roll shaft tip of the U-shaped bearing is formed in a convex shape holds the roll shaft.

That is, in the present invention, as described above,
By configuring, the roll shaft and the bearing of the roll located in the bath are held by the bath, so that the rotation is smooth, and the tip of the shaft is formed in a convex shape. Even if it comes into contact with the wall of the U-shaped bearing, it will be almost point contact, and rotation will not be hindered.
Further, it is possible to reliably prevent further movement in the roll width direction, to surely prevent the surface contact between the roll end face and the bearing, to make the rotation of the roll smooth at all times, and to prevent scratches and the like on the plated steel strip.

[0008] The surface of the roll shaft and the inner surface of the bearing are eroded by the hot-dip plating metal, and the respective surfaces are formed with irregularities, which may hinder the rotation of the roll. Therefore, the surface roughness is about Ra: 10 µm or less ( 7 DS or less). For that purpose, for example, carbide such as WC,
It is preferable to coat a corrosion resistant substance such as a boride such as ZrB ₂ .

In addition, as a mode of forming the tip of the shaft into a convex shape, for example, in addition to forming the shape into a truncated cone, the center of the shaft tip surface is formed into a convex shape, that is, by moving the roll in the width direction (oscillation). When the shaft tip comes into contact with the bearing wall, it comes into surface contact,
In order to prevent the rotation,
The tip of the shaft is formed in a convex shape.

[0010]

Next, embodiments of the present invention will be described.

In FIG. 1, the tip of a shaft 6 of a bath roll A such as a sink roll or a support roll has a truncated cone shape (convex shape).
7, which is engaged with and held by the U-shaped bearing 8. Shaft 6
2 constitute a convex shaft tip 7 as shown in FIGS.

Thus, by the rotation of the roll A, the shaft 6 is press-fitted into the U-shaped bearing 8 and is held by the bath, so that the rotation is smooth, and the tip of the shaft 6 is moved by the widthwise movement (oscillation) of the roll A. It contacts the inner wall 9 of the U-shaped bearing 8 and reliably prevents the contact between the end face 10 of the roll A and the bearing 8.

Further, the tip of the shaft 6 has a truncated conical shape 7, and the contact with the wall 9 is almost a point contact, so that the contact does not hinder the rotation of the roll A.

The surface of the roll shaft 6 and the position 11 of the roll shaft 6 on the inner surface of the U-shaped bearing 8 are coated with a corrosion-resistant substance to prevent the formation of irregularities due to the erosion caused by the plating bath.

Therefore, it is possible to reliably prevent the occurrence of scratches due to the slip of the plated steel strip due to the temporary stop of the roll rotation.

As shown in FIG. 4, the roll shaft 6 is held by a U-shaped bearing 8 in which a contact portion inner wall 9 of the U-shaped bearing 8 at the end of the roll shaft 6 is formed in a convex shape 7 so that the roll A end face 10 and the bearing 8 Prevents contact with

[0017]

[Effect of the Invention] By doing so, the rotation of the roll in the bath becomes smooth, the abrasion of the plated steel strip can be reliably prevented, the quality can be improved, and the yield can be improved. The excellent effect of is obtained.

[Brief description of the drawings]

FIG. 1 is a partially sectional explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing an example of the shape of the shaft 6 in the present invention.

FIG. 3 is an explanatory view showing an example of the shape of the shaft 6 in the present invention.

FIG. 4 is an explanatory view showing another embodiment of the present invention.

FIG. 5 is an explanatory diagram of hot-dip metal plating.

FIG. 6 is a partial cross-sectional explanatory view showing a holding state of a conventional roll in a bath.

FIG. 7 is a partial cross-sectional explanatory view showing a conventional holding state of a roll in a bath.

[Explanation of symbols]

6: Roll A shaft 7: Convex tip 8: C-shaped bearing 9: C-shaped bearing inner wall 10: Roll A end face 11: Roll shaft position on C-shaped bearing inner surface 12: Corrosion resistant substance

 ────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-3-24254 (JP, A) JP-A-3-126854 (JP, A) JP-A-1-168548 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. The contact point of the U-shaped bearing at the tip of the roll shaft is substantially pointed.
A roll in a bath of a hot-dip metal plating in which the roll shaft is held in a U-shaped bearing and is formed in a convex shape so as to come into contact . 2. A bath roll of a hot-dip metal plating bath, wherein a roll shaft is held by a U-shaped bearing in which an inner wall of a contact portion of a roll shaft tip of the U-shaped bearing is formed in a convex shape.