JPS5944923B2 - Rolling method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for rolling a metal strip (hereinafter referred to as a strip).

More specifically, it is a rolling method for providing a compact and highly efficient rolling mill suitable for efficiently rolling strip.

In particular, it relates to a rolling method in which it is easy to reduce the diameter of the working roll for rolling, and it is possible to reduce the rolling reaction force generated during rolling, as well as the rolling power that drives the working roll, and to reduce deformation resistance. This makes it possible to easily roll materials with high hardness or thin strips that are difficult to roll. Furthermore, by reducing the rolling reaction force, it is possible to improve the accuracy of the sheet thickness and improve the width edge of the sheet. This paper proposes a rolling method that aims to reduce the so-called niche drop, which is a sudden drop in plate thickness due to roll deformation.

A further object of the present invention is to provide a rolling method capable of rolling at a high reduction rate per stand by stably and simultaneously performing three rolling operations in one pass.

Furthermore, the rolling method according to the present invention is characterized in that stable rolling is performed under large tension, and in combination with the reduction in the diameter of the operating roll, further reduction in rolling reaction force can be achieved.

Organizing and describing the functions required of a rolling mill, the first is how easily the material to be rolled can be deformed, that is, how large a rolling process can be performed with a small amount of energy consumption. be.

As a result, the size of the entire rolling mill can be reduced, and the construction cost and operating cost of the equipment can be reduced.

Furthermore, it contributes to reducing wear and tear on the rolls.

The second is whether or not the operation of passing the strip through a rolling mill is easy.

The third issue is whether the structure of the rolling mill is simple or not.

The present invention is a rolling method for providing a rolling mill with a new structure that simultaneously satisfies the functions required of the rolling mill.

The rolling mill according to the present invention will be explained below with reference to the drawings.

Figures 1 and 2 were invented by the present inventor on April 11, 1978.
This is a rolling mill based on a new principle, for which a patent application was filed as Japanese Patent Application No. 53-42396.

In the figure, 1 is a working roll located at the center of the rolling mill.

Hereinafter referred to as the central working roll, 2.2', 2'' are three working rolls surrounding the central working roll.

Hereinafter, it will be referred to as the outer circumferential working roll. 3 indicates a strip.

As shown by the arrow, the strip enters from above the outer working roll 2, passes between the center working roll 1 and the outer working roll 20 A while contacting the working roll, and winds around the central working roll 1, and then wraps around the outer working roll 2'. and center actuating roll 1
It passes through B in between, further wraps around the center actuating roll 1,
C between the outer working roll 2'' and the central working roll 1, and while in contact with the outer working roll 2'', the working roll 2''
Go upward as indicated by the arrow (.

The characteristics of the rolling mill based on the invention are as follows: (1) If the thickness of the IJ tube can be ignored, the outer working rolls 2.2', 2''
have the same diameter, and if the center working roll diameter is d and the outer working roll diameter is D, the following can be said.

The central working roll 1 shown in Fig. 4 represents the case of the minimum diameter; if the diameter is smaller than this, the outer working rolls 2.2', 2'' and the central roll 1 will not come into direct contact with each other, making it impossible to roll the strip. .

The state shown in Fig. 4 is that of the three outer working rolls 2.2.
This is because ', 2'' are in contact with each other.

Therefore, the center working roll diameter d must be smaller (both smaller than shown in FIG. 4).

In FIG. 4, line segments a, b, and c form a right triangle when connecting the center 02 of the outer working roll 2, the center 01 of the central working roll 1, and the contact point P22' between the outer working roll 2 and 2''.

Here, the length of line segment a is D/2, and the line segment is (D/2
+d/2), and the angle 0201P22'' is 60 degrees.

If it is flat, the angle 0□01P2□' is 1/6 of 360 degrees, so on the other hand, the length of each side of a right triangle whose three angles are 90°, 60°, and 30° as shown in Figure 5 is Saha l
:2:V/T is well known.

Therefore, d in FIG. 4 can be obtained as follows.

Due to the similarity condition of the triangles, 2, 2', and 2'' are guaranteed to rotate smoothly without contacting each other, and are thin central working rolls that are suitable for the multi-stage Sendzimir rolling mill, which has the smallest working roll diameter in practical use. The diameter can be easily achieved without complicated stacking of rolls, such as in a multi-stage Sendzimir rolling mill, from small diameters to successively large diameters.

Although the central actuating roll is extremely thin, it is supported in an extremely stable manner by the three peripheral actuating rolls.

FIG. 2 further shows the roll arrangement and sheet passing state of a practical rolling mill, with additional reinforcement rolls 4.4', 4'' and deflector rolls 5, 5'.

In the rolling mill of the invention, the strip first passes through a teflector roll 5.5'l located above the rolling mill, and after the right and left reels 8, 8' are connected by the strip, they are retracted directly above. The center actuating roll is lowered by the support 6 and pushes the strip into the center of the rolling mill, creating the IJ tube passing condition during rolling.

In this invention, since the initial passing position of the strip is above the rolling mill, the vertical stroke of the center operating roll must be increased, so that the overall structure of the rolling mill becomes taller.

In addition, the lubricant supplied by the lubricant spray header 7 during rolling has no chance of being squeezed out on the top surface of the IJ tube, and a large amount of lubricant adheres to the top surface of the strip after rolling, causing quality problems. be.

In order to solve this drawback of the invention, the present invention, as shown in FIG. 1, then between the center working roll and the outer working roll 2', then between the central working roll and the outer working roll 2'', and passing between the working roll 2'.
It is wound around half a circumference and exits through between the working roll and the reinforcing roll 4.

In such a condition, the lubricant adhering to the top surface of the strip on the exit side is exposed to the outer circumferential operating roll 2'' and the reinforcing roll 4''.
After rolling, the surface of the IJ tube is freed from excess lubricant and its scum.

On the other hand, at the time of the first threading, as shown by the dotted line in the figure, it is sufficient to pass the material very close to the upper part of the outer working rolls 2 and 2'' with the help of top guides, etc. indicated by 9 and 9'. As shown by the dotted line, it is only necessary to raise the outer peripheral working roll upward, and the vertical stroke can be shortened compared to the above invention.

On the other hand, the reinforcing roll 4, the outer working roll 2, and the reinforcing roll 4'' and the outer working roll 2'' act as priddle rolls on the entry and exit sides of the rolling mill, and contribute to stabilizing the rolling tension.

That is, by sandwiching the strip 3 between the reinforcing roll 4 and the outer working roll 2, the strip 3 is brought into close contact with the surfaces of both rolls, and the strip 3 is stabilized at the rolling point between the central working roll 1 and the outer working roll 2. It is something that can be sent.

Similarly, by sandwiching the strip 3 between the reinforcing roll 4'' and the outer working roll 2'', the strip 3 is stably pulled out from the rolling point between the central working roll 1 and the outer working roll 2'' and sent to the next process. be able to.

Of course, it is obvious that rolling can be carried out more efficiently by using a plurality of such rolling mills in tandem.

Furthermore, by installing a strip welding machine on the entry side of the rolling mill and a strip cutting machine on the exit side, the initial threading can be reduced and the work can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1 is a roll arrangement diagram explaining the basic principle of the present invention;
FIG. 2 is an explanatory diagram showing a conventional usage example of the sheet passing state in the roll arrangement shown in FIG. 1, FIG. 3 is an explanatory diagram of the sheet passing state according to the present invention, and FIGS. 4 and 5 are central operation examples. FIG. 3 is an explanatory diagram showing a process of deriving a relational expression between a roll diameter and an outer working roll diameter. 1... Center operating roll, 2.2', 2"...
...Peripheral working roll, 3...Rolled strip, 4.4'. 4"...Reinforcement roll, 5,5'...Deflator roll, 6...Center operating roll support, 7...Lubricating oil spray header, 8,8'・
...Stop take-up reel, 9,94...Top guide.

Claims (1)

[Claims] Thirteen peripheral working rolls 2.2', 2'' are arranged surrounding one central working roll 1, reinforcing rolls 4, 4', reinforcing the peripheral working rolls 2.2', 2'',
In a rolling mill equipped with reinforcing rolls 4, 4" or reinforcing 2, 2", the strip to be rolled enters between the reinforcing roll 4 and the outer working roll 2, The three outer working rolls and one central working roll are passed through the three gaps between the outer working roll 2", 2" and the center working roll 1, and then exiting between the outer working roll 2" and the reinforcing roll 4". Rolled simultaneously at three rolling points by rolls,
Further, reinforcing rolls 4, 4'' and outer peripheral operating rolls 2,
A rolling method characterized in that the rolling tension on the entry side and the exit side is stably applied by 2".