JPS5832007B2 - Mandrel for high temperature winding coiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a mandrel for a coiler, particularly a down coiler, for winding hot strip into five coils at high temperatures.

A down coiler is a typical piece of equipment used to wind hot strip into a coil.As shown in Figure 1, this equipment usually consists of a mandrel A, which is the center of winding the coil, and a down coiler. It consists of three to four unit rollers B arranged around the rollers and their attached equipment, such as pinch rolls C.

The present invention relates to a technique for winding a strip using this down coiler at a higher temperature than usual.

It goes without saying that winding sl-IJ strips at high temperatures is essential for special materials (such as silicon steel plates), but it is also possible to produce strips with excellent metallurgical properties even from ordinary materials. It has been especially celebrated recently.

As long as the strip itself to be wound is at a high temperature, it is not particularly difficult to wind it at a high temperature.

However, if the surface temperature of the mandrel is low, even if the coil is normally wound at a high temperature, the 5th to 4th layers of the coil will be rapidly cooled by the mandrel, and the purpose of high-temperature winding will be Therefore, the third and fourth layers of the coil become defective products, which greatly reduces the yield of finished products.

In order to prevent this, the surface temperature of the mandrel may be maintained at a high temperature.

At this time, it has been calculated that if effective high temperature winding is 800 to 900°C, the surface temperature of the mandrel should be maintained at 500 to 600°C.

On the other hand, the mandrel itself is assembled from highly precisely machined parts, and its surface temperature is kept at 50°C.
Needless to say, it is difficult to maintain the temperature between 0 and 600°C in order for the temperature to function effectively.

Therefore, the inventors of the present invention have completed the present invention as a result of intensive research to provide a mandrel that functions effectively without causing the interior to become very hot even when the surface of the mandrel is kept at a high temperature. .

That is, in the present invention, a large number of supporting members are provided at intervals on the outside of the mandrel, an outer layer having a shape along the outer surface of the mandrel is installed and fixed on the supporting members, and air is provided between the outer layer and the outer surface of the mandrel. Regarding a mandrel for a high-temperature winding coiler characterized by a layered structure, this technology is particularly useful for application to a down coiler for a hot strip mill.

Hereinafter, embodiments of the present invention will be described in further detail using FIGS. 2 and 3.

An outer layer 2 is provided on the outside of a segment 1 of a mandrel A of a down coiler for a hot strip mill, and the outer layer 2 has a shape that follows the surface of the segment 1 and is made of a not-so-thick steel plate.

A large number of short cylinders 3 (second
) or a conical pedestal 3' (see FIG. 3) is provided and the respective ends are joined to the outer layer 2 and the segment 1.

Therefore, the intermediate layer 4, which is separated by the outer layer 2 and the segments 1, is formed of a number of cylinders 3 or conical pedestals 3' and a space filled with air, that is, an air layer.

Although the heat of the wound coil is easily transferred to the outer layer 2,
Less heat is transferred to the segment 1 through the intermediate layer 4.

This is because the cylinder 3 or conical pedestal 3' has a sufficiently small cross-sectional area compared to the surface area of the outer layer, and the air layer has a poor heat transfer coefficient.

Therefore, the inside of the mandrel A, that is, the segment 1 is not exposed to high temperatures.

Also, the outer layer 2 has a small heat capacity and is therefore easily heated, so if the outer layer is heated, the coil wound at a high temperature will not be cooled down.

The coil winding temperature is 900℃, and the heating temperature of outer layer 2 is 50℃.
The temperature is about 0° C., and FIG. 4 shows a conceptual diagram of the temperature state after a certain period of time from the start of winding.

In Figure 4, a is the coil, b is the outer layer of the mandrel, and C
is the mandrel segment, d is the support material, and e is the coil a.
and the outer layer, and 4 indicates the air layer in the middle layer.

Since the mandrel for a high-temperature winding coiler of the present invention has the above-described configuration, it has the following effects.

(1) Since the outer layer provided on the outside of the mandrel segments is engaged with the segments through supporting members such as a large number of cylinders or cones, less heat is transferred to the segments when heating the outer layer.

Even if the high-temperature coil is wound after heating the outer layer, the inner diameter of the coil is hardly cooled, and the inside of the mandrel is not heated much.

Therefore, the coil is satisfactory as a finished product from the first layer, and since the inside of the mandrel is not exposed to high temperatures, its mechanical function is not impaired.

(2) Also, there is no need to use a large amount of heat-resistant material for the segment body.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional down coiler, Figures 2 and 3
The figure is a diagram for explaining the structure of the mandrel of the high-temperature winding coiler of the present invention, and Fig. 4 shows the temperature gradient between the coil and the mandrel after a certain period of time using the mandrel for the high-temperature winding coiler of the present invention. FIG.

Claims (1)

[Claims] 1. A large number of supporting materials are provided at intervals on the outside of the mandrel, an outer layer having a shape along the outer surface of the mandrel is installed and fixed on the supporting material, and an air layer is provided between the outer layer and the outer surface of the mandrel. A mandrel for high-temperature winding coilers.