JPS603902A - Cold rolling method of steel strip by sendzimir mill - Google Patents

Abstract

PURPOSE:To improve the shape and yield of a product by rounding the shoulder of a taper part formed at one end of the 1st intermediate roll into a circular- arcuate shape in a Sendzimir mill for cold rolling. CONSTITUTION:One end of each of the 1st intermediate rolls 7, 7' of an Sendzimir mill is formed into an approximately circular-arcuate part 12, and the curve of part 12 is formed so as to be tangent to the straight line of the cylindrical part of roll 7, 7'. The rolls 7, 7' are moved in the axial directions by a proper amount each, to roll indirectly a steel strip through work rolls 8. A ratio between the minimum diam. D of the tip of said part 12 and the diam. D0 of the cylindrical part is made to be, D/D0=99.18-99.87%. Further, a ratio between the roll length L, from the contact point of the straight line of cylindrical part 7, 7' and the curve of circular-arcuate part to the tip of part 12, and the whole roll- length L0 is made to be, L/L0=25-48.6%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for modifying the shape of a steel strip during cold rolling of a copper strip using a Senshimia mill.

The Sensimire mill has a known shape correction mechanism including a lateral adjustment mechanism using a first intermediate roll and a ΔsU adjustment mechanism using a backing hair ring, and these machines will be briefly described below.

The lateral adjustment mechanism has a shape with a taper on one side of the roll, and moves the upper and lower first intermediate rolls that back up the work roll by an appropriate amount at the appropriate time depending on the longitudinal force of the work roll. By transmitting the line or shape to the work roll and changing the shape of the work roll, it is possible to roll the steel strip to a smooth and uniform thickness depending on the quality of the steel strip, thickness, width, rolling reduction, etc. It is a very well designed mechanism.

On the other hand, the AsU21i1 adjustment mechanism individually adjusts each backing bearing at an appropriate position in the longitudinal direction of the second intermediate roll in the backing ring which is arranged at the outermost side of the upper rolling roll group and is divided into a plurality of parts in the axial direction. The shape of the steel strip to be rolled can be corrected by using a mechanism that finely adjusts the position and ultimately ensures the optimum roll curve of the work roll during rolling. .

However, none of these shape correction mechanisms are perfect, and uneven shape defects called quarter buckles occur on the surface of the rolled steel strip, causing scratches and other defects in the next UNIFW, which reduces manufacturing yield. This was the cause of the decline.

The present invention relates to the improvement of the lateral adjustment mechanism of the above-mentioned shape f1 and the normal mechanism.

One embodiment of the present invention will be described below based on the drawings.
The figure is a common diagram for detailed explanation of the conventional method and the present invention, and is the 213th! 1 to 5 are for explaining the conventional method, and FIGS. 6 to 8 are for explaining the present invention in detail. The steel strip 9 is shaped by the leveler 2, rolled by the mill body I3, and wound onto the tension reel 3. Steel 1[9 then reciprocates between the left and right tension reels 3' and 3JtJI, and is rolled to the target cage. In the figure, 4' and 4 are deflation crawls, 5°5' is a backing bearing, 6.6' is a second intermediate roll, 7.7' is a first intermediate roll, and 8.8' is a work roll. .

Fig. 2 is an enlarged layout view of the main parts showing only the steel strip 9, work roll 8, 8', and first intermediate J-lua 7' shown in Fig. 1. The state in which the tapered portions 11 are provided to the first intermediate rolls 7 and 7', two of which are arranged in each of the first intermediate rolls 7 and 7', is shown.

Also, FIG. 3 shows the steel strip 9 (!) located LJ in the A-A cross section of FIG.
: This shows the arrangement relationship of only the workpiece II rolls 8, 8' and the first intermediate roll 7.7'.The lateral adjustment mechanism described above adjusts the workpiece by moving the first intermediate roll 7.7' in the plate radius direction. The shape of the steel (1) 9 is modified through the rolls 8, 8'.

Generally, the first intermediate roll 7.7' is provided with a taper 11 at one end, as shown in FIG. 4, and is provided with a one-step taper (a) or a multi-step taper (b). However, taper 1
1, there is a boundary between the straight part and the tapered part of the roll 7°7', that is, a straight shoulder part in the circumferential direction, so this shoulder part is indirectly connected via the work roll 8.8'. As a result, the steel strip 9 is locally over-rolled, and as shown in FIG. The above-mentioned lateral adjustment mechanism, As
Even if the U mechanism was operated and adjusted, it was not possible to make a sufficient correction.

This quarterbuckle is thought to be caused by the position of the rolled steel strip corresponding to the above-mentioned shoulder being extended more locally over the entire length of the steel strip, and is unique to Senshimia mills in the prior art. The shape is defective.

Therefore, as a result of conducting various experiments in order to eliminate the shoulder portion of the first intermediate roll 7.7', as shown in FIG.
We concluded that it is effective to add . This arcuate portion 12 only needs to have a smooth contact between the curve and the straight line of the cylindrical portion, and may be a circular arc or a general quadratic curve, but good results have been obtained by using a sine wave curve. That is, when giving the first intermediate roll 7.7' the arcuate portion 12, it is done by a roll grinder equipped with a cam having a sinusoidal curve, and then the diameter of When the minimum diameter of the roll end is D (mm), D
Fig. 7 shows the results of rolling experiments conducted by varying /D. The horizontal axis shows D/δ0. The vertical axis represents the vertical steepness of the steel strip as an index indicating the shape of the copper strip (fl/1, where p is the pitch of the quarterbuckle and h is the depth or height of the unevenness)
(expressed as x100 (%)), D/D
, is 99.18% to 99.87%, the copper strip is in good shape.

In addition, the total length of the first intermediate roll 7.7' is L6 (mm
), the length of the arcuate portion 12 was L (mm), and rolling experiments were conducted while changing L/L·. The results are shown in FIG. The horizontal axis shows L/L, and the vertical axis shows the steepness (%) in the longitudinal direction of the steel strip, which is L/1. .

A good shape can be obtained when the ratio is between 25.0% and 48.6%.
There is ζ.

As described below, by implementing the present invention, it is possible to obtain a good shape with fewer quarter buckles, but the effects can be explained in more detail as follows: (1) The shape of the product is improved and unevenness of 1 piece is prevented. becomes (2
) It is expected to prevent scratches caused by defective shapes during the M manufacturing process and improve manufacturing yield.

(3) Since the steel strip surface is smooth, pickling properties are expected to improve. (The descaling effect is large.) (4) <4!
! ) It is possible to improve the yield by grade, that is, to prevent downgrading.

As described above, the present invention has great effects on manufacturing, and is extremely effective in improving product quality and reducing manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of Senshimia Mill, Fig. 2 is an enlarged layout of the main parts of the steel strip, soak roll, and first intermediate roll in Fig. 1, and Fig. 3 is a cross section of the first self IA-A. A layout diagram of the steel strip, work roll, and first intermediate roll. FIG. 4 is an external view of the conventional first intermediate roll.
) indicates a three-stage taper. Figure 5 (a) is a perspective view showing a quarter buckle that has occurred in the steel strip, and Figure 5 (b) is an explanation that introduces the steepness of the steel strip in the longitudinal direction using the B-13 cross section in Figure (a). It is a diagram. Figure 6 is the first
Fig. 7 is a graph of D/Do-steepness, Fig. 8 is a graph of L/C, -
This is a graph of steepness. l Payoff reel 2 Leveler 3.3' Tension reel 4.4' Deflex crawl 5.5' Backing ring 6.6' Second intermediate roll 7.7' First intermediate roll 1 8.8' Work roll 9 Steel strip lO quarter buckle 11 Tapered part 12 Arc-shaped part 13 Mill body patent applicant Nisshin! ! L Steel Co., Ltd. Agent Patent Attorney 1) Gokeineya Figure) To ■ Metsu Kasumi Figure 8 L/Lo(X)

Claims (1)

[Scope of Claims] 1. In a sensimir mill for cold rolling, one end of the 1141st intermediate roll has an outwardly convex substantially arc-shaped part, and the straight line of the cylindrical part of the intermediate roll is in contact with the curve of the circular part. After forming, the first intermediate roll is moved in the axial direction by an appropriate amount, the position is set, and the steel is indirectly pressed against the surface of the copper strip via the work roll. 1 cold rolling method. 2. When the minimum diameter of the tip formed by the arcuate part is D, and the straight line of the cylindrical part is 1, then l) / D is 99°18% to 99.87%. A method of cold rolling a copper strip using a sensimire mill according to claim 1. 3 PJ from the point where the straight line of the cylindrical part and the curved part of the circular arc part touch
When the length of the roll to the tip formed by the IiW-shaped part is L, and the total length of the roll is Lo, L/L is 2
5.0% to 48.6%. A method of cold rolling a steel strip using a Senshimia mill according to claim 1.