JPS6152909A - 1-stand 3-pass multi-stage rolling mill - Google Patents

Abstract

PURPOSE:To obtain a strip of good shape at high rolling reduction by making at least one of outside work rolls small diameter roll, and providing side support rolls and side support bearings for the small diameter rolls. CONSTITUTION:Four rolls, small diameter work rolls 1, 4 and large diameter work rolls 2, 3, are arranged vertically, and two side support rolls 5, 5 and side support bearings 6 are arranged outside to back up rolls 1, 4. Further, intermediate rolls 7 and back up rolls 8 are arranged to reinforce work rolls. S-shaped rolling is made possible by this mechanism, and at the same time, shape control is made easily even in rolling of high rolling reduction by shifting of intermediate rolls in horizontal direction. Accordingly, the strip rolling excellent in shape can be made even at high rolling reduction.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a technology that belongs to the industrial field for rolling gold scrap strips, especially copper strips, and the disclosure content of this specification is a technology for rolling gold scrap strips, especially copper strips. This is a proposal for an improved technique for one-stand three-pass rolling that is suitable for obtaining strips with good shapes.

(Prior technology) A general steel strip (hereinafter simply referred to as "strip") cold rolling installation (in) consists of several stands of rolling mills arranged in tandem, and has the advantages and results of 48 stages. However, there are disadvantages such as increased equipment and maintenance costs, and there are also constraints in terms of factory space, so multi-layered arrangements are often undesirable.

For example, in rolling where the total reduction exceeds 80%,
If it is a corrugated rolling mill, at least 4 stands are required.
Moreover, if it is a 4-high rolling mill, at least 5 stands are required.

This background technology was originally published in Japanese Patent Application Laid-Open No. 56-171.
A technique for performing high reduction rolling in one stand has been proposed, as disclosed in No.-05.

FIG. 4 shows a typical example of such prior art.

At J5 in the drawing, numerals 21 and 22 are work rolls, 23 and 24 are backup rolls, 25 and 26 are tension pry rolls, and S is a strip.

As shown in this figure, the strip S in the prior art is between the backup roll 24 and the work roll 22;
Work Role 22.21 Mutual Questions and Work Role 2
1 and a backup roll 23 to perform three buses of rolling.

(Problems to be Solved by the Invention) However, in the conventional rolling technique shown in FIG. 4 above, when rolling is attempted at a larger reduction ratio, roll deformation increases and the shape of the strip deteriorates. However, there was a problem in that it was difficult to obtain a strip with a good shape under so-called high reduction rolling.

An object of the present invention is to propose a novel multi-high rolling means that can overcome the above-mentioned problems.

(Means for Solving the Problems) In order to overcome the above-mentioned problems of the known one-stand three-bus type rolling technology, the present invention provides a method for overcoming the above-mentioned problems by using backup rolls or bearings. For a 1-stand 3-bus type multi-high rolling mill configured such that four work rolls that are rolled up are arranged in a vertical arrangement and a rolling bus is formed between each of the adjacent work rolls, the work rolls are At least one of the outermost rolls is a small-diameter work roll, and this small-diameter work roll is provided with two side support rolls and a side support bearing, as well as an intermediate roll and a backup roll. This problem was solved by adopting a one-stand, three-pass multi-rolling mill that was reinforced with steel.

(Function) FIG. 3 shows the relationship between rolling load and rolling reduction ratio for the rolling mill of the present invention and the conventional rolling mill. In this figure, the curve (A
) is an example of conventional general 4-high rolling or 6-high rolling.
The curve (C) is an example of a conventional one-stand three-pass rolling mill, and the curve (C) is an example of a one-stand three-pass rolling mill of the present invention. For example, when rolling with a rolling reduction of 40%, the rolling mill of the present invention requires only a rolling reduction of 600-.
In the example of the Sendzimir rolling mill, 1500 tg is required,
This difference allows the present invention to operate under high pressure without deteriorating the shape of the strip.

(Example) FIGS. 1-(a) and (b) show examples of typical roll configurations of the present invention, which will be specifically explained below with reference to the drawings. 1 stand 20 according to the present invention shown in this figure
In the three-pass rolling I configuration, four small-diameter work rolls 1.4 and large-diameter work rolls 2 and 3 are vertically arranged, and two side support rolls are used to back up the small-diameter work rolls 1.4. 5.5 and four side lipo bearings 1 to 6 each are arranged on the left and right outer sides of the small diameter work roll 1.4, and furthermore, an intermediate roll 7 and a backup roll 8 are arranged. are placed at predetermined positions 1a above and below to reinforce the work roll.

A rolling pass is formed between adjacent work rolls 1, 2, 2, 3, and 3 and 4, respectively. This means that
- Rolling the lip 9 in an S-shape - Threading and rolling with the straw strip wrapped around each inner large-diameter work roll 2.3 for half a turn, resulting in 3-pass rolling in one stand This makes it possible to roll the strip into a good shape under high pressure.

J3, for the outer small diameter work roll 1.4,
If a multi-stage roll arrangement structure reinforced by side support rolls 5, side support bearings 6, intermediate rolls 7, and backup rolls 8 is adopted,
Even in the case of high pressure rolling, the shape of the strip 9 can be easily controlled by shifting the intermediate roll 7 in the horizontal direction.
ll 1211, making it possible to roll the IR shaped strip even under so-called relatively high rolling reductions (for example 60-70%). Na J5
, 10 in the drawings indicates a deflector roll.

FIGS. 2-(a) and (b) are Ii+i diagrams of a single pressure 11 roll arrangement showing another embodiment of the present invention. Components common to those in FIG. 1 are designated by the same reference numerals. The feature of this example is that the small-diameter work roll 1 is arranged only on the upper side, and backup is performed only for this upper small-diameter backup roll - that is, two side support rolls 5, 5, 4 side support bearings 6, etc.
- 1-stand 13-stage 3-pass rolling reinforced by intermediate rolls 7 and backup rolls 8 (This is an example; this type also allows for the same shape control and product reduction as in the first illustrated example. It is.

It should be noted that the rolling mill according to this embodiment has a work roll 11 with a large diameter, unlike the outer lower roll of the first illustrated example.

(Effects of the Invention) As explained above, according to the present invention, even if the rolling blade is enlarged, deformation of the work roll does not occur, and even under such a relatively high rolling reduction rate, a strip with a well-shaped shape can be produced. This has the effect that rolling can be easily achieved.

[Brief explanation of drawings]

Figure 1 - (a> and (b) are both 1 according to the present invention)
Front view (a) and side view (b) do not show an example of a three-stand multi-pass multi-rolling practice, and FIGS. An example of a multi-high rolling mill, its front view (a
), side view (b), Fig. 3 is a graph showing the relationship between rolling load and rolling reduction for the rolling mills of the present invention and the conventional rolling mill, and Fig. 4 is an example of a conventional one-stand three-pass rolling mill. FIG. 1.4...Small diameter work roll 2.3...Large diameter work roll 5...Side support roll 6...Side support bearing 7...Intermediate roll 8...Backup roll 9...Strip 10. ...Deflector roll 11...Large diameter work roll. Patent applicant Kawasaki Steel Corporation Figure 3 Rolling/f @ Toru (Kg) Figure 4

Claims (1)

[Claims] 1. Four work rolls reinforced through backup rolls or bearings are provided in a vertical arrangement, and a rolling pass is formed between each of the adjacent work rolls. For a one-stand three-pass multi-stage rolling mill, at least one of the work rolls located on the outside is a small-diameter work roll, and two side support rolls and side support bearings are provided for this small-diameter work roll. A one-stand three-pass multi-high rolling mill characterized in that it is further reinforced with a combination of intermediate rolls and backup rolls. 2. The multi-high rolling mill according to claim 1, wherein the intermediate roll is shifted in the horizontal direction to control the shape of the strip.