JP2533271B2 - Strip winder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mandrel disposed on a line for processing a strip in a heated state, such as a hot strip rolling mill or a thin-wall continuous casting facility, for winding the strip at a high temperature. .

[0002]

2. Description of the Related Art Conventionally, a mandrel having a wedge-type expansion / contraction mechanism has been used as a hot strip winding device. The hot strip after the processing such as rolling is supplied to the mandrel at a high temperature, and the hot strip is wound around a segment provided around the mandrel.

However, when a hot strip is wound by using this type of winding device, the sliding portion between the slide rod and the wedge shaft constituting the expansion / contraction mechanism by the heat input from the hot strip or the slide rod and the hollow portion. In some cases, the mandrel cannot be expanded or contracted due to seizure caused by deterioration of the grease applied between the shaft and the shaft.

When a hot strip is wound,
The outer peripheral side of the segment is heated by the hot strip, and at the same time, the inner peripheral side of the segment is removed by heat transfer to the internal mechanism side of the mandrel. In this way, the segment has a temperature distribution in which the temperature on the surface side is higher than that on the inner peripheral side, and as a result, warpage is likely to occur in the thickness direction. If the segment is warped, it has an effect such that it hinders the tightening of the coil of the hot strip being wound, or the segment itself is damaged.

[0005] In order to solve such troubles, various structures have conventionally been developed. For example, in Japanese Patent Laid-Open No. 61-17326, a pressing piece fitted with a heat insulating material is inserted between a segment and a slide rod incorporated as a member for moving the segment in the radial direction, and the inside of the mandrel is inserted from the segment. There is disclosed a structure for suppressing heat removal from the slide rod. And
In this device, by covering the surface of the hollow shaft with a heat insulating material and incorporating a water cooling pipe, it is possible to suppress heat radiation from the segment to the hollow shaft and prevent the temperature rise of the hollow shaft.

Further, JP-A-56-47211, JP-A-56-47212, JP-A-56-47215.
The publication discloses a heat transfer sleeve fitted on the outer periphery of the segment to suppress heat transfer from the hot strip to the segment.

Further, in Japanese Patent Laid-Open No. 56-62618, a large number of support materials are provided outside the segment at intervals, and an outer layer having a shape along the outer surface of the mandrel is placed and fixed on the support material. An air layer is provided between the outer layer and the outer surface of the mandrel to suppress heat transfer from the hot strip to the segment.

Further, Japanese Patent Application Laid-Open No. 56-95416 proposes that when the hot strip is wound, the hot strip and the heat insulating material are co-wound to suppress heat conduction to the mandrel.

[0009]

As described above, various measures have been taken to prevent seizure of the sliding portion and warpage of the segments caused by heat input from the hot strip. There are still many aspects that none of them have enough functions and effects.

For example, Japanese Unexamined Patent Application Publication No. Sho 6-96 mentioned in the section of the prior art.
According to the publication No. 1-17326, it is necessary to transmit the winding force of the strip to the wedge shaft for moving the segment in the radial direction, so that the entire pressing piece between the segment and the slide rod is covered with a heat insulating material. I can't. For this reason, there is no change in that the heat transfer surfaces of the metal members intervene from the segment toward the internal mechanism side of the mandrel, and there is a tendency that heat insulation or heat removal suppression from the segment toward the slide rod is insufficient. It is in. In addition, not only the equipment cost is increased due to the provision of the water cooling tube, but there are many problems in terms of maintenance cost.

Further, JP-A-56-47211, JP-A-56-47212 and JP-A-56-47215.
In the one disclosed in the publication, a complicated work of attaching and detaching a heat insulating sleeve provided around the segment for each coil of the hot strip to be wound is required. For this reason, not only the work load is increased, but also it is necessary to prepare a plurality of sleeves, and therefore an obstacle in terms of equipment cost cannot be ignored.

Further, in the one disclosed in Japanese Patent Laid-Open No. 56-62618, a support material between the segment and the outer layer transmits the tightening force of the strip, and a heat insulating material is used as the support material. Therefore, there is no change in the fact that the heat transfer surfaces of the metal members intervene from the segment toward the internal mechanism side of the mandrel, and heat insulation or heat removal suppression from the segment toward the slide rod is insufficient. There is a tendency. Further, there is a problem that the support material itself is severely worn by the transmission of the strip winding force, and cannot be used for a long period of time. Furthermore, since it is necessary to fix a large number of supporting materials between the segment and the outer layer, not only the mechanical structure is complicated and the equipment cost is high, but also there are many problems in maintenance.

Further, in the case where the hot strip and the heat insulating material are co-wound as described in JP-A-56-95416, it is necessary to remove the heat insulating material when the coil is rewound, which complicates the work. This hinders the improvement of productivity.

As described above, in any of the technologies, sufficient insulation of the segment is not achieved,
Therefore, the problem of obstacles due to the warp deformation of the segments has not been solved yet.

The problem to be solved in the present invention is that the heat transfer from the segment to the internal mechanism can be suppressed without complicating the mandrel structure, the warp deformation of the segment can be reliably prevented, and the hot strip winding can be performed for a long time. The purpose is to provide a structure that can withstand harvesting.

[0016]

SUMMARY OF THE INVENTION The present invention is a strip winder having a mandrel in which a plurality of segments are connected to an internal mechanism such that the segments can be expanded and contracted in a radial direction, and the segments are circumferentially arranged with an outer layer portion. It is characterized in that it is divided into inner layer segment bodies, and an air layer and a heat insulating layer are formed on the outer surface of the inner layer segment bodies.

[0017]

The segment is circumferentially divided into the outer layer portion and the inner layer segment body, and the air layer and the heat insulating layer are formed on the outer surface of the inner layer segment body, so that the outer layer segment is heated by the hot strip. At this time, the heat transfer to the inner layer segment body is suppressed by the presence of the heat insulating layer and the presence of the air layer having a small heat transfer coefficient. Therefore, the outer layer segment can be maintained in a high temperature uniform temperature distribution, and the inner layer segment body can be maintained in a low temperature uniform temperature distribution. As a result, heat transfer from the inner layer segment body to the internal mechanism side of the mandrel is suppressed, and the sliding portion between the slide rod and the wedge shaft constituting the expansion / contraction mechanism and the grease applied between the slide rod and the hollow shaft are reduced. The operation can be performed without causing seizure due to deterioration and without making it impossible to expand and contract the mandrel.
Further, since the generation of the temperature gradient in the thickness direction of the outer layer segment and the inner layer segment main body is suppressed, the warp deformation of the segment is prevented.

Since the heat insulating layer is integrally formed on the outer surface of the inner layer segment body, the heat insulating layer is excellent in deterioration resistance and maintainability. Also, since the air layer is integrally formed on the outer surface of the inner layer segment body, the mechanical structure is It is simple, inexpensive, and easy to maintain.

[0019]

1 is a longitudinal sectional view of a mandrel of a winding device, and FIG. 2 is a longitudinal sectional view taken along a plane orthogonal to the axis of the mandrel. The mandrel 1 is a segment type conventionally used, and has a wedge shaft 3 inserted into a hollow shaft 2 so as to be movable in the axial direction. Four segments 4 are arranged on the outer periphery of the mandrel 1, and the inner periphery of each segment 4 is connected to the hollow shaft 2 so as to be movable in the radial direction.

The wedge shaft 3 has a wedge surface 3a on its peripheral surface.
The radial position of each segment 4 is set by using the movement in the axial direction and the inclination of the wedge surface 3a. Such radial movement of the segment 4 is performed via a slide rod 5 incorporated between the wedge shaft 3 and the segment 4, and the slide rod 5 changes its position in the radial direction by the movement of the wedge surface 3a. Determine the position of segment 4.

Each segment 4 makes direct or indirect contact with each of the slide rod 5, the wedge shaft 3 and the hollow shaft 2 which are connected to the inner peripheral side of the segment 4, and when the hot strip is wound around the segment 4, these segments are connected to these members. Heat transfer occurs. This heat transfer is suppressed and segment 4
The segment 4 itself is provided with an adiabatic structure for making the temperature distribution in the wall thickness direction uniform.

FIG. 3 is a longitudinal sectional view of a main part showing an example of the heat insulating structure of the segment 4. FIG. 4 is a vertical cross-sectional view of a main part showing another example of the heat insulating structure of the segment 4. Segment 4
Is divided into an outer layer segment 6 part and an inner layer segment body 7 in the circumferential direction, and an air layer and a heat insulating layer are formed on the outer surface of the inner layer segment body 7, so that the outer layer segment 6 and the inner layer segment body 7 may be in direct contact with each other. Try not to.
The heat insulating layer 8 may be formed by applying heat-resistant wool, for example, in conformity with the shape of the outer surface of the inner layer segment body 7, but ceramics such as alumina or zirconia may be sprayed or chemically treated on the outer surface of the inner layer segment body 7. It is more preferable to integrally mold the heat insulating layer 8 from the viewpoint of preventing deterioration of the heat insulating layer 8 and improving maintainability. The heat insulation layer 8 may be formed on the entire outer surface of the inner layer segment body 7 as shown in FIG. 3, or only on the contact portion of the outer surface of the inner layer segment body 7 with the outer layer segment 6 as shown in FIG. You may shape. Further, the air layer 9 on the outer surface of the inner layer segment body 7 may be formed in a groove shape by, for example, knurling, or may be formed in a satin shape by dimple processing.

With such a configuration, even if the outer layer segment 6 is heated by the hot strip when the hot strip is wound, the synergistic effect of the presence of the heat insulating layer 8 and the air layer 9 causes the outer layer segment 6 to the inner layer segment body. There is no heat transfer to 7. For this reason, the inner layer segment main body is maintained at a low temperature, and no temperature gradient occurs in the thickness direction. Therefore, the warp of the inner layer segment body 7 is suppressed.

Further, the outer layer segment 6 has a uniform temperature distribution at high temperature, and no temperature gradient occurs in the thickness direction. Therefore, the occurrence of warpage of the outer layer segment 6 is also suppressed. Further, since the inner layer segment main body 7 is maintained at a low temperature, there is no heat conduction from the inner layer segment main body 7 to the internal mechanism side of the mandrel 1, and the sliding portion between the slide rod 5 and the wedge shaft 3 which constitutes the expansion / contraction mechanism, The mandrel 1 can be operated without expansion or contraction of the mandrel 1 without causing seizure due to deterioration of the grease applied between the slide rod 5 and the hollow shaft 2.

Further, without fixing a large number of supporting materials between the outer layer segment 6 and the inner layer segment body 7 or forming an air layer on the outer layer segment 6 which is a consumable product, the outer layer of the inner layer segment body 7 which is a permanent product is treated. Since the heat insulating layer 8 is formed on the surface, the mechanical structure is simple, the cost is low, and the maintenance is easy.

[0026]

According to the present invention, when the hot strip is wound, the outer layer segment has a uniform temperature distribution at a high temperature, and the inner layer segment body can be prevented from having a large temperature gradient in the thickness direction at a low temperature. It does not cause seizure due to deterioration of the grease applied between the slide rod and wedge shaft, or between the slide rod and hollow shaft, and the mandrel can be operated without expansion or contraction. it can. Further, since the warp deformation of the segment is prevented, the coil can be wound tightly and the segment itself is not damaged.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a mandrel of a winding device of the present invention.

2 is a vertical cross-sectional view of the mandrel of FIG.

FIG. 3 is a vertical cross-sectional view of a main part showing an example of forming an air layer and a heat insulating layer on the outer surface of the inner layer segment body.

FIG. 4 is a vertical cross-sectional view of a main part showing another example of forming an air layer and a heat insulating layer on the outer surface of the inner layer segment body.

[Explanation of symbols]

 1 Mandrel 2 Hollow shaft 3 Wedge shaft 4 Segment 5 Slide rod 6 Outer layer segment 7 Inner layer segment body 8 Insulation layer 9 Air layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-36018 (JP, A)

Claims (1)

(57) [Claims] 1. A winder for a strip having a mandrel connected to an internal mechanism so as to be capable of expanding and contracting a plurality of segments in a radial direction, wherein the segment is circumferentially divided into an outer layer portion and an inner layer segment body. A strip winding machine characterized in that an air layer and a heat insulating layer are formed on the outer surface of the inner layer segment body.