JPH0631337A - Mandrel for winding hot strip - Google Patents

Abstract

(57) [Abstract] [Purpose] In a mandrel for winding a hot strip, the temperature distribution inside the segment is made uniform without a complicated structure, and its warp deformation is surely prevented. In a mandrel for a hot strip in which a plurality of segments are connected to an internal mechanism so as to be movable in a radial direction, a heat insulating layer is formed on a surface of the segment facing the internal mechanism, and a segment heated by the hot strip is fed to the internal mechanism side. By suppressing heat transfer to the segment and uniformly heating the segment, the temperature gradient in the thickness direction is suppressed. In addition, a heat insulating layer or a water cooling cooling heat insulating layer is formed on the outer peripheral surface of the segment in contact with the hot strip to prevent heat transfer to the segment and suppress the heating temperature of the segment. Warp deformation can be prevented by keeping the temperature below the temperature.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A segment type mandrel is generally used for winding a hot strip. The hot strip after processing such as rolling is supplied to this mandrel at a high temperature, and is wound around the segment provided on the peripheral surface of the mandrel.

When the hot strip of high temperature is wound in this way, 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 winding of the coil of the hot strip being wound and the segment itself is damaged. In order to eliminate such troubles, various structures have been conventionally developed.

For example, in Japanese Unexamined Patent Publication 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. A structure for suppressing heat removal to a slide rod inside a mandrel is disclosed.

Further, Japanese Patent Application Laid-Open No. 56-47215 discloses a structure in which a heat insulating sleeve is fitted around the outer circumference of the segment to suppress heat transfer from the hot strip to the segment. Further, JP-A-56-954
Japanese Unexamined Patent Publication No. 16 discloses a method in which, when the hot strip is wound, the strip and the heat insulating material are wound at the same time, and the heat insulating material suppresses heat transfer from the hot strip to the segment of the mandrel.

Further, Japanese Utility Model Publication No. 61-35292 discloses a structure in which a heat insulating material is incorporated in the segment to suppress heat transfer to the internal mechanism side of the mandrel.

[0008]

As described above, various measures have been taken to prevent the warp deformation of the segments, but it can be said that all of them still have sufficient functions and effects. There are many unremaining faces.

For example, Japanese Unexamined Patent Application Publication No. Sho 6 (1994) mentioned in the prior art
Since the wedge shaft for moving the segment in the radial direction is connected to the slide rod in the case of JP-A-1-17326, the entire pressing piece between the segment and the slide rod cannot be covered with the heat insulating material. Therefore, there is no change in that the heat transfer surface between the metal members is interposed from the segment toward the internal mechanism side of the mandrel, and there is a tendency that the heat insulation or heat removal suppression from the segment to the slide rod is insufficient. It is in.

Further, in the one described in Japanese Patent Laid-Open No. 56-47215, it is necessary to perform a complicated work of attaching and detaching the heat insulating sleeve provided around the segment for each coil of the hot strip to be wound. Therefore, not only the work load increases, but also the equipment cost is affected when a plurality of sleeves are prepared.

Further, in the case where a hot strip and a heat insulating material are co-wound as described in JP-A-56-95416, the heat insulating material is removed when the hot strip and the heat insulating material are wound into a coil and then rewound by an uncoiler. New work is added. For this reason, there is no obstacle in terms of efficiency up to the hot strip winding process, but labor is required for the subsequent process.

Further, in the one disclosed in Japanese Utility Model Publication No. 61-35292, since the heat insulating material is sandwiched between the segments, a three-layer structure of a segment layer, a heat insulating material layer and a segment layer facing the mandrel from the outside is formed. Becomes Therefore, the layers of the segments outside the heat insulating material have a higher temperature than the layers of the inside segment, and a temperature difference occurs between the layers of the segments. Therefore, when looking at the entire segment, the temperature difference becomes larger than in the case where the heat insulating material is not interposed, which may rather promote the warp deformation of the segment.

As described above, in any of the technologies, sufficient heat 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 to make the temperature distribution inside the segment uniform without making the structure complicated and to reliably prevent the warp deformation.

[0015]

DISCLOSURE OF THE INVENTION The present invention is a hot strip mandrel in which a plurality of segments are connected to an internal mechanism so as to be movable in a radial direction, and the segments have a heat insulating layer on a surface facing the internal mechanism. Is formed.

Further, a heat insulating layer may be formed on the outer peripheral surface of the segment which is in contact with the hot strip.

Further, a cooling heat insulating layer through which cooling water passes can be provided on the outer peripheral surface of the segment.

[0018]

[Function] By making the segment with a heat insulating layer formed on the surface facing the internal mechanism of the mandrel, when the segment is heated by the hot strip, the heat insulating layer prevents heat transfer from the segment to the internal mechanism side of the mandrel. To be Therefore, the amount of heat removed on the inner peripheral side of the segment is also small, the entire segment is uniformly heated by the hot strip, and the occurrence of a temperature gradient in the thickness direction is suppressed. Therefore, the segments can be maintained in a high temperature and uniform temperature distribution, and the warp deformation of the segments is prevented.

Further, by providing a heat insulating layer on the outer peripheral surface of the segment to prevent heat transfer from the hot strip, the temperature rise of the segment can be kept within a certain low temperature range. Therefore, even if a temperature gradient occurs in the thickness direction of the segment, it is possible to prevent the warp deformation of the segment as long as the temperature does not rise to the extent of thermally deforming the segment.

Further, even when the outer peripheral surface of the segment is provided with a cooling heat insulating layer using cooling water, the segment can be kept in a low temperature range against heating from the hot strip. For this reason, a large temperature gradient does not occur in the thickness direction of the segment, and its warp deformation is prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway view of a mandrel of a winding device, and FIG. 2 is a vertical sectional view taken along a plane orthogonal to the axis of the mandrel. It is a figure shown corresponding to the area | region of the cross section in each arrow position.

The mandrel 1 is a segment type that has been conventionally used, and a wedge shaft 4 is inserted into a hollow shaft 2 so as to be movable in the axial direction thereof. Four segments 5 are arranged on the outer circumference of the mandrel 1, and the inner circumferences of the segments 5 are connected to the hollow shaft 2 so as to be movable in the radial direction.

The wedge shaft 4 has a wedge surface 4a on its peripheral surface.
Are arranged, and the position of each segment 5 in the radial direction is set by utilizing the movement in the axial direction and the inclination of the wedge surface 4a. Such radial movement of the segment 5 is performed through a slide rod 6 incorporated between the wedge shaft 4 and the segment 5, and the slide rod 6 is displaced in the radial direction by the movement of the wedge surface 4a. The position of segment 5 is determined by.

In FIG. 2, only the two upper and lower segments 5 are superposed on the slide rod 6, but the two left and right segments 5 are also different in cross-section position and similarly slide rod 6 is also included. Of course it is connected to.

Each segment 5 directly or indirectly contacts with each of the slide rod 6, the wedge shaft 4 and the hollow shaft 2 which are connected to the inner peripheral side thereof, and when the hot strip is wound around the segment 5, these members are connected to these members. Heat transfer occurs. This segment 5 itself is provided with a heat insulating structure for suppressing such heat transfer and making the temperature distribution in the thickness direction of the segment 5 uniform.

FIG. 3 is a longitudinal sectional view of a main part showing a heat insulating structure between the segment 5, the hollow shaft 2 and the slide rod 6.

A heat insulating layer 5a having a uniform thickness is formed on the inner peripheral surface of the segment 5 so that the metal material of the segment 5 does not directly contact the metal surfaces of the hollow shafts 2 and 3 and the slide rod 6. To do so. The heat insulating layer 5a is formed in a sheet shape using, for example, heat-resistant wool or the like, and is adhered according to the inner peripheral shape of the segment 5, or if it is made of ceramics or the like, it is integrally formed by a thermal spraying method. You can also do it.

Since the portion of the segment 5 that contacts the internal member of the mandrel 1 is covered with the heat insulating layer 5a, the segment 5 is wound when the hot strip is wound.
However, there is no heat transfer from this segment 5 to the internal member side. For this reason, since the surface of the segment 5 is heated and no heat is removed from the inner peripheral surface, the entire segment 5 is uniformly heated, and no temperature gradient occurs in the thickness direction. Therefore, the occurrence of warp deformation of the segment 5 is suppressed,
The coil of the hot strip can be wound tightly and the segment 5 itself is not damaged.

FIG. 4 is a longitudinal sectional view of the main part showing another example.

In this example, a heat insulating layer 5b is provided on the outer peripheral surface of the segment 5, and this heat insulating layer 5b is also integrated with the segment 5 by the material and forming method illustrated in FIG.

By providing the heat insulating layer 5b on the outer circumference of the segment 5, the heat insulating layer 5b is heated when the hot strip is wound, and the heat transfer to the metal cloth side of the segment 5 is blocked by the heat insulating layer 5b. Although this thermal cutoff is not perfect, the temperature rise of the segment 5 can be markedly reduced as compared with the case where the metal material of the segment 5 directly contacts the hot strip. If the thickness of the heat insulating layer 5b is appropriately set so that the degree of temperature rise is within the temperature range in which the warp deformation of the segment 5 does not occur, the warp deformation of the segment 5 itself does not occur even when heated by the hot strip. Does not happen.

As described above, by suppressing the temperature rise of the metal material of the segment 5, the temperature gradient in the thickness direction of the segment 5 can be restricted to a small value, which is effective in preventing the warp deformation.

FIG. 5 is a schematic vertical sectional view of an example in which heat transfer from the hot strip to the segment 5 is reduced by water cooling.

A plurality of grooves 5c are formed on the outer peripheral surface of the segment 5 at appropriate intervals in the axial direction, and cooling water can be supplied to the grooves 5c from the outside.

By thus sending the cooling water into the groove 5c, the heat transfer to the segment 5 when the hot strip is wound can be regulated, and the heat insulating layer 5b explained in FIG.
As in the case of 1, the temperature rise of the segment 5 can be suppressed. Therefore, similarly, the warp deformation of the segment 5 can be prevented, and the coil can be well wound and the segment 5 can be prevented.
Prevents damage to itself.

Further, by controlling the flow rate of the cooling water, the cooling of the segment 5 corresponding to the temperature of the hot strip and the handling for preventing the heat transfer can be operated relatively easily. Therefore, even in a line in which the type of hot strip is variously changed, it is not necessary to replace the entire mandrel, and there are many facility advantages.

[0037]

As described above, according to the present invention, when the hot strip is wound up, the high temperature is made uniform or the low temperature is made uniform so as not to cause a large temperature gradient in the thickness direction of the segment. The warp deformation of is prevented. Therefore, the winding of the coil can be satisfactorily tightened, and the segment itself is not damaged.

[Brief description of drawings]

FIG. 1 is a cutaway view showing a mandrel of a winding device of the present invention.

FIG. 2 is a vertical cross-sectional view of the mandrel corresponding to the positions of arrows AA to FF in FIG.

FIG. 3 is a vertical cross-sectional view of a main part showing an example in which a heat insulating layer is provided on the inner circumference of a segment.

FIG. 4 is a vertical cross-sectional view of a main part showing an example in which a heat insulating layer is provided on the outer peripheral surface of a segment.

FIG. 5 is a longitudinal cross-sectional view of a main part showing an example in which a groove for supplying cooling water is formed on the outer peripheral surface of a segment.

[Explanation of symbols]

 1 Mandrel 2, 3 Hollow shaft 4 Wedge shaft 5 Segment 5a Heat insulating layer 5b Heat insulating layer 5c Groove 6 Slide rod

Claims (3)

[Claims] 1. A mandrel for a hot strip, wherein a plurality of segments are connected to an internal mechanism so as to be movable in a radial direction, wherein the segment has a heat insulating layer formed on a surface facing the internal mechanism. Mandrel for hot strip winding. 2. A mandrel for a hot strip, wherein a plurality of segments are connected to an internal mechanism so as to be movable in a radial direction, wherein the segment has an insulating layer on its outer peripheral surface which is in contact with the hot strip. A mandrel for winding a hot strip characterized by being formed. 3. A mandrel for a hot strip, wherein a plurality of segments are connected to an internal mechanism so as to be movable in a radial direction, and each segment has a cooling heat insulating layer on its outer peripheral surface through which cooling water passes. Winding mandrel for hot strip.