JPH01148416A - Band plate forming roll having cooling apparatus - Google Patents

Abstract

PURPOSE:To improve cooling capability of a roll by providing a closed space inside a forming roll, arranging a cooling piping in its space and in addition, sealing a liquid cooling medium therein. CONSTITUTION:A ring-shaped closed space 23 is formed between an operating roll piece 1 having an internal fin 1' and a subsidiary roll 22, and a cooling pipe 24 having a suitable shape is arranged in the closed space. In addition, cooling medium such as water, etc., is sealed in the space 23. When a working roll piece 1 is in operation, the heat generated in the roll piece 1 is transmitted to the liquid cooling medium in the closed space, then, this heat is exhausted out of the system through a secondary cooling medium in a cooling pipe 24 via a rotary joint. Since liquid cooling medium moves relatively to the cooling pipe 24 in the space 23, the heat generated in the roll piece 1 is transmitted and exhausted efficiently out of the system. In this way, the cooling capability of the roll is improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a strip forming roll used for bending a metal strip in the width direction through a multi-stage roll stand, especially one equipped with a cooling device. Regarding.

[Conventional technology]

Among strip forming rolls, especially squeeze rolls for welding electric resistance welded pipes, the edges are in contact with the material to be formed that is heated to a high temperature for welding, and are further internally heated to a high temperature by the induction effect of the high-frequency current for welding. . This causes disadvantages such as the possibility of seizure with the material to be formed and the loss of material performance such as wear resistance due to the tempering effect.

A conventional solution to this heating problem of the rolls is to spray water over the entire weld area, including the squeeze rolls. Methods such as providing a cooling water passage inside the squeeze roll body and passing cooling water through it have been adopted. However, the former has problems with the performance and reliability of the welded part, and the latter has a complicated roll structure due to the formation of cooling water passages that prevent water leakage, and a sufficient cooling effect cannot be obtained.

That is, FIG. 2 shows an example of this.

The entire roll has working roll pieces 1. to form cooling water passages. Sleeve 2-1, ring 2-2, cap 2-3
and rotary joint 3, partition plate 4 (see (b))
, a large number of sealing O-rings, plugs, bolts, etc., and the cooling water flows through the passage A-.

[Problem that the invention seeks to solve]

As mentioned above, the conventional roll with a cooling device had a complicated structure and did not have a sufficient cooling effect.

An object of the present invention is to provide a roll with a cooling device that has a novel cooling structure that enhances the cooling effect and has a simplified structure.

[Means for solving problems]

The present invention forms a closed space inside the roll, and provides a cooling pipe for passing a secondary cooling medium such as cooling water in the space.
A cooling medium such as water is sealed in the space outside the cooling pipe.

[Effect]

In the roll of the present invention, the heat transferred to the working roll piece or generated by induction is transferred to the liquid cooling medium sealed in the closed space, and this heat is further cooled through the cooling pipe provided in the space. transferred to a secondary cooling medium such as water,
taken out of the system.

The shape of the working roll piece that comes into contact with the material to be formed can be determined almost freely by providing fins or having an appropriate wall thickness, so that heat can be effectively transferred to the liquid cooling medium. In addition, especially when the roll axis is not vertical, the liquid cooling medium moves relative to the roll due to the rotational movement of the roll, so that heat is transferred from the roll and to the cooling tube with a high thermal conductivity.

The cooling pipe of the present invention is manufactured from a blunt copper pipe, etc., and has a free shape and does not require high shape accuracy. Moreover, it is extremely easy to work as only the leakage of the secondary cooling medium needs to be taken care of at both ends. Therefore, it can have a sufficient length, that is, a sufficient surface area, and can transfer a large amount of heat.

〔Example〕

Next, the present invention will be explained based on the drawings of the embodiment.

FIG. 1 shows an example in which the present invention is applied to a squeeze roll. Squeeze top rolls are generally small in shape, so
The conventional cooling water passage system was considered to be less effective. Working roll piece 1 with inner fins 1'
A ring-shaped closed space 23 is formed between the shaft portion 20, a sub-roll 22 including a side plate 21, and the like. The sub roll 22
A copper pipe 24, which is a cooling pipe bent into an appropriate shape to fit into the closed space 23, is attached.
This pipe may come into contact with other parts of the working roll piece 1 or the auxiliary roll 22, and its shape accuracy does not matter. By being soldered, they are passed through the supply and drain ports of the rotary joint 3, respectively.

A suitable amount (volume ratio of about 50% or more) of water, which is a liquid cooling medium in which a suitable rust preventive agent is dissolved, is sealed in the closed space 23 . Depending on the amount of water, this water can be kept in a state where it hardly rotates with respect to the rotation of the rolls, and the water is kept at a relative speed that is the rotational speed at the time of use with respect to the working roll piece 1 and the cooling pipe 24. (Note: In this embodiment, the liquid cooling medium rotates at approximately twice the rotation speed due to centrifugal force.)

There will be no particular mention of the heat transfer path.

This embodiment is directed to the squeeze roll, which has conventionally been considered the most severe in terms of cooling, and has sufficient cooling capacity for this roll.

〔Effect of the invention〕

As described above, while the conventional cooling water passage system uses cooling water to directly cool the working roll pieces, the roll of the present invention cools them indirectly. However, the wall thickness of the working roll, the surface area on the closed space side, the formation of fins, etc.
In addition, when the axis is made to be particularly close to horizontal, the high thermal conductivity due to the large relative movement with the liquid cooling medium
It has a cooling capacity greater than that of conventional cooling water passage type rolls. This has a great effect of improving the conventional cooling method such as spraying water on the welded part.

[Brief explanation of the drawing]

FIG. 1 is a diagram of an embodiment in which the present invention is applied to a squeeze roll, and FIG. 2 is an example of a conventional waterway type roll. 1: Working roll piece, 2-1 Ni sleeve. 2-2=ring, 2-3=cap. 3: Rotary joint, 4: Partition plate, A-: Cooling water path, 20: Shaft, 21: Side plate, 11: Sub roll, 23: Closed space, 24: Copper pipe, 25: Liquid cooling medium

Claims (1)

[Claims] 1. In a strip forming roll equipped with a cooling device used to bend and form a metal strip in the width direction through a multi-stage roll stand, a closed space is formed inside the roll, and a closed space is formed in the space. A strip forming roll with a cooling device, characterized in that a cooling pipe for passing a liquid secondary cooling medium is provided, and the liquid cooling medium is sealed in the space outside the cooling pipe. 2. The strip forming roll with a cooling device according to claim 1, wherein the roll is a welding squeeze roll. 3. The strip forming roll with a cooling device according to claim 1 or 2, wherein a part of the surface defining the closed space is a part of the surface of the roll member that comes into contact with the material to be formed. .