JPH04143003A - Manufacture of rolled steel strip requiring multipass - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Fields] The present invention is used to repeatedly roll carbon steel strips, stainless steel strips, high-alloy steel strips, titanium strips, titanium composite strips, and other rolled steel strips that require multiple passes. This invention relates to a method of manufacturing by threading a sheet.

[Prior art] Conventionally, as a method for manufacturing rolled steel strip that requires multiple passes,
A method in which a sheet is passed in one pass using a tandem rolling mill in which four or more rolling mills are arranged in tandem (hereinafter referred to as tandem rolling method). There is a method of manufacturing by repeatedly passing the sheet in the opposite direction to give the necessary rolling passes (hereinafter referred to as reverse rolling method).

Since the tantem rolling method described above can provide the necessary number of rolling passes in one pass, it is possible to manufacture rolled steel strips that require multiple passes with high efficiency. The disadvantage was that the initial construction costs were high because of the high cost of construction.

On the other hand, in the reverse rolling method, the initial construction cost is low because the number of rolling mills is small, or the sheet must be turned in the forward and reverse directions (usually about 3 to 10 passes). Loss time required for starting, stopping, and reversing the rolling work rolls (the time during which the rolling rolls are not rolling, hereinafter referred to as loss time), the product steel strip that has been rolled and the raw material steel strip that will be rolled next (next rolling Due to the unavoidable setup adjustment loss time associated with the reverse rolling method, such as loss time due to replacement of coils, etc., the actual operation of the rolling work rolls (movement time Tw/work roll actual rolling time) time T, ten step adjustment loss time T1
．． ) had the disadvantage of a 50-70'J culm degree.

As a solution to the shortcomings of the reverse rolling method, (1) The actual operating time T of the rolling work rolls is increased by increasing the unit weight of the raw material steel strip, thereby improving the actual operating rate.

■ By incorporating automation into setup adjustment work,
To improve the actual operating rate by reducing the setup adjustment loss time TL.

(]) By increasing the maximum rolling speed, the time required for rolling mills can be reduced and the number of copper strips that can be rolled (for example, per month) can be increased.

Kasa, C-do-Goku, or a combination has been attempted.

However, because the countermeasures (2) and (2) require expensive large-scale equipment, and (2) does not eliminate setup adjustment work, there is a limit to improving the actual operating rate.

In addition, in conventional reverse rolling, if lambda substances (e.g. rolling oil, metal powder from the previous process) adhere to the surface of the raw steel strip, it can cause rolling troubles, so measures are taken to prevent this. Surface cleaning was performed in a separate process.

Furthermore, if the material is stainless steel, it is usually rolled by passing it through a single Sendzimir rolling mill repeatedly for about 3 to 10 passes, or it has a high deformation resistance, so it is rolled at 20 to 50 kgf/
It is necessary to apply an extremely large tension of mm2 before rolling. Since this tension is applied by a winder, the product steel strip is wound up with an extremely high tension of 20 to 50 kgf/mm<2>. As a result, when the tape is measured with a rod, the winding tension is released, causing the copper strip to loosen and cause slip defects on the surface. In order to prevent this, in the conventional method, intermediate paper was continuously inserted between the steel materials to prevent the steel materials from coming into contact with each other when the product steel strip was wound up during the rolling process.

[Problem to be solved by the invention] In the production of rolled copper strips that involve multiple passes, the present invention or the conventional method to solve the problem: ■ Is the tantem rolling method superior in productivity? Construction costs are high.

■ Since the reverse rolling method requires unavoidable loss time due to setup adjustments, the actual operating rate of the rolling work rolls is low. Measures to improve productivity include increasing the unit weight of the raw material steel strip and increasing the rolling speed, but both require expensive large-scale equipment costs.

■ It is necessary to remove foreign substances (such as different types of rolling oil, metal powder, etc.) that may cause rolling troubles from the surface of the raw steel strip in advance during the cleaning process.

α) For J material or stainless steel, slip 1 during unwinding
For prevention 1)-, it is necessary to insert intermediate paper when winding up the product steel strip.

[One stage and operation for solving Ja] The present invention solves the above-mentioned problems, enables continuous rolling at low construction cost, reduces cutting culm, and enables rolling that requires multiple passes. This makes it possible to manufacture steel strip with high productivity.

In other words, ■ and ■ in the three chapters of Karuki have the following means structure ■
It is solved by

■ A raw steel strip receiving device receives the rolled steel strip, two or more unwinding devices for the rolled steel strip, a device for connecting the front and rear ends of the copper strip, an accumulator for the copper strip, a tensioning device, 1
one or more copper strip rolling mills, a copper strip splitting device and two
a rolling line in which more than one copper strip winding device is successively arranged; and an intermediate rolling line for returning the intermediate rolled steel strip wound by the steel strip winding device to the steel strip unwinding device for the next pass of rolling. Using a rolled steel strip return device, the rolled steel strip is continuously rolled, and the copper strip of the pressed caster 44 is turned around in the -jj direction to produce a product steel strip. The product is produced and the copper strip is discharged using a product steel strip dispensing device.

Furthermore, the above three problems (2) are solved by the following means structure (2).

■ A copper strip surface cleaning device is installed between the front and rear ends of the steel strip connecting device and the tensioning device, and a rolling oil removal device and surface cleaning device are installed between the copper strip rolling mill and the tensioning device. By installing the device, product steel strips with excellent surface properties can be manufactured regardless of the surface properties of the raw material steel strips to be rolled.

Furthermore, the above-mentioned problem (2) is solved by means configuration 0 of ()-- below.

- A tension applying device is placed between the raw steel strip rolling mill and the copper strip winding device, and the tension applied to the copper strip is separated into the rolling zone and the winding zone, and the tension is applied to the copper strip in the rolling zone. The steel strip is rolled by applying the high tension necessary for rolling and the low tension necessary for winding to the copper strip in the winding area, and rolling the rolled steel strip without inserting intermediate paper. Wind up.

The present invention will now be described with reference to Figures 1-1 and 2.

1', f film configuration (2) will be explained. The raw steel strip is received by the receiving device 12, and the unwinding device IA, IB
It is unwound from the tip and fed to the rolling line.

The tip end of the steel strip is connected to the rear end of the leading and trailing end on standby by a connecting device 2. Two or more unwinding devices are arranged to prepare the next copper strip to be supplied, thereby reducing downtime associated with connection.

The connecting device 2 consists of a copper strip cutting machine and a welding device (for example, a lessor welding machine), and if necessary, a weld quality improvement device 1 (
heat treatment equipment, light rolling equipment, grinding equipment, brushes, etc.) may be provided. The steel strip B supplied to the rolling line is stored in an accumulator 4 to absorb line stoppages due to connection of the leading and trailing ends of the copper strip, etc. Rolling is performed in the rolling mill 6 while applying tension necessary for rolling to the rolled steel strip B by the bow and long sword applying device 5A. The rolling mill 6 is composed of one or more rolling mills, and a cluster rolling mill such as a Senshimia rolling mill is used in a line for rolling stainless steel. The rolled copper strip is peeled off by the cutting devices 9A and 911.

When the wound copper strip reaches a predetermined length or a predetermined position, it is cut and divided by a dividing device 8. The dividing device does not need to have one end connection as described in if, but in the case of the final pass, the required product length (or weight), and in the case of the intermediate pass, the optimum length from the viewpoint of efficiency and quality. Divide by size (or weight). Two or more winding devices are installed, and the divided succeeding steel strips are winding devices 9A and 9B designed to take up the preceding steel strip, and another winding device 9B,
Wind up continuously at 9A. Furthermore, if necessary, a copper band accumulator may be installed in front of the dividing device to absorb the reduction in capacity caused by switching the winding. In the case of intermediate products, the divided copper strips are sent to intermediate rolled steel strip return facility 10.
The return light path 11 is returned by the eaves and re-supplied to the rolling line by the unwinding devices IA and IB according to a predetermined order, and the above procedure is reversed to perform rolling according to the rolling schedule of the next pass. In the case of fully rolled copper strip or product steel strip,
The product steel strip is delivered to the next process by the delivery equipment 13.

Since the present invention has a means configuration as shown in FIG. Theoretically, it is possible to increase the actual working rate Tw/Tw''Tt of 2 units to too!6.
idle time T1. This is because it is theoretically possible to eliminate the problem. As a result, productivity can be improved without taking measures that require expensive large-scale equipment, such as increasing the rolling speed and increasing the unit weight of the raw steel strip, which were necessary to increase production efficiency in the conventional reverse rolling method. Is it possible to increase it? In addition, in conventional reverse rolling, the copper strip between the winder and the rolling mill is left unrolled and results in a loss of yield, so a rieter coil is welded to the tip of the raw steel strip on a separate line. However, the present invention eliminates the need for this problem, making it possible to omit steps and save materials.

Next, the means configuration (2) of the present invention will be explained.

This makes it possible to obtain a greater effect by adding it to the above-mentioned (2). That is, a cleaning device 3A for the surface of the copper strip is installed between the connecting device 2 and the tension applying device 5^, and the surface of the steel strip to be rolled is cleaned by the cleaning device 3A. The cleaning conditions are not particularly limited, and conventionally known cleaning techniques are applied. As a result, when a rolled steel strip that has been rolled using a different rolling oil than that used for rolling on this line or a copper strip that has undergone surface clinter grinding and has metal powder etc. adhered to it is used as the material of the present invention. Also, there is no need to carry out cleaning treatment in advance in other processes, making it possible to save process steps.

Furthermore, a rolling oil draining device 7 and a surface cleaning device 3B are installed between the rolling mill 6 and the tensioning device 5B, and the devices remove and recover the rolling oil in the main line.
Wash and remove rolling oil and foreign matter adhering to the surface of the copper strip after rolling. As a result, it is possible to remove deposits on the surface of the product steel strip that may cause various problems in the post-process, thereby making it possible to eliminate restrictions on the post-process. Furthermore, by arranging a cleaning device on the inlet side of the tension applying device, stable tension can be applied.

Next, the means structure O of the present invention will be explained.

Particularly in the rolling of stainless steel, a greater effect can be obtained by adding to the means structure (1), and an even greater effect can be obtained by adding to the means structure (2) and (2).

That is, a tension applying device 5B is installed between the rolling mill 6 and the winding devices 9A and 9B, and the tension is separated into the rolling zone and the winding zone by this device, and the tension required for rolling is applied to the copper strip in the rolling zone. Tension (20~50kgf/mI+!2) is applied, and low tension (2~10kgf) required for winding is applied to the copper strip in the winding area.
/1nff12). When rolling a steel material with high deformation resistance such as stainless steel, it is necessary to apply an extremely large tension of 20 to 50 kgf/mm2 before rolling. However, in the conventional lever rolling method, tension reels 22A and 22B are installed on both sides of the Sendzimir rolling mill 21, as shown in FIG.
Since the tension is not separated between the rolling zone and the winding zone, winding has to be carried out using the high tension required for rolling. Therefore, as mentioned above, it was necessary to insert intermediate paper to prevent slip defects during reversal in the next step. In the present invention, the minimum necessary low tension (
Since it is possible to wind the film at a speed of 2 to 10 kgf/mm 2 ), even if it is rewound, there will be no slip flaws, so it is possible to omit the insertion of intermediate paper.

[Examples] Table 1 shows examples in which the present invention was applied to rolling stainless steel strips. Examples of stainless steels include ferritic stainless steels 5IJS410 and 5US430, and austenitic stainless steel S II 5304.

No. 011 to No. 5 are examples of the present invention, which were carried out using a Sendzimir rolling mill on the line configured as shown in FIG. 1 described above. No
, Nos. 6 to 9 are the conventional examples described above, and were carried out on a rolling line configured as shown in FIG. 3. The preceding steel strip and the following steel strip were connected by laser welding or TIG welding and were continuously rolled. The example of the present invention has significantly less idle time than the conventional example, so the actual rolling average was 1.5 (9 times). There was no need to do so. By cleaning within the line, we were able to obtain products with good surface properties without causing rolling troubles due to foreign matter for both annealed and unannealed materials.

As a result of unwinding the product steel strip of the example of the present invention in the next step, it was possible to obtain a copper strip with excellent surface quality without the occurrence of slip flaws. In addition, inventive examples No. 2, No. 3, and No. 3 were rolled as the same lot up to 6 passes, and product plate J7 was obtained.
Nos. 0 and 2 are discharged to the next stage by the product steel strip dispensing equipment, and Nos. and 3 are returned to the intermediate rolling steel strip return equipment to be rethreaded and rolled into products after the 7th pass.

[Effects of the Invention] The method of manufacturing rolled steel strip that requires multiple passes according to the present invention has an extremely high actual rolling operation rate, low construction costs because it does not require a large number of rolling mills, and intermediate processing during the cleaning process and winding process. It has features such as omitting paper insertion, etc., and easy manufacturing according to the product plate thickness, and is extremely effective in manufacturing rolled steel strips, especially rolled steel strips with high deformation resistance such as stainless steel.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of equipment layout in the manufacturing method of the present invention;
FIG. 2 is a plan view of the equipment shown in FIG. 1, and FIG. 3 is a side view of an example of equipment arrangement in a conventional manufacturing method. IA, IB-- Rewinding device, 2... Connection device, 3A
, :IIB--Cleaning device, 4--Accumulator, 5A, 5B--Tensioning device, 8--Dividing device, 9A, 9B--Rewinding device, 10--Returning device, 11-...Return route, 12...Accepting device, 13-...
... Payout device, 21 ... Sendzimir rolling mill, 22A
. 22B・-Tension reel. Applicant's agent Patent attorney Tomoyuki Yabuki (one idiot) Diagram? Proceedings January 31, 1991 2. Name of the invention Method for manufacturing rolled steel strip requiring multiple passes 3. Relationship with the case of the person making the amendment Patent applicant address Otemachi, Chiyoda-ku, Tokyo 2-chome 6-3 name (
665) Nippon Steel Corporation 4, Agent 〒1
11 Address No. 14, Tomoyuki Hill, 3-4-5 Kuramae, Taito-ku, Tokyo
Storey (5687) 60545, date of amendment order
January 22, 1991 6, Title of the invention and scope of claims in the specification to be amended, Column 7, Contents of the amendment (1) The title of the invention in the specification is amended as follows. [Method for manufacturing rolled steel strip requiring multiple passes (2) The claims of the specification are amended as shown in the attached sheet. Claims 1. In the production of rolled steel strip, which requires multiple passes, the rolled steel strip is received by a raw steel strip receiving device, and two or more rolled copper strip unwinding devices, copper strip front and rear end connecting devices, copper strip accumulators, tension A rolling line in which a applying device, one or more copper strip rolling machines, a copper strip dividing device, and two or more copper strip winding devices are arranged in succession, and an intermediate steel strip wound by the steel strip winding device. The rolled steel strip is continuously rolled using an intermediate rolled steel strip return device that returns the rolled steel strip to the copper strip unwinding device for the next pass of rolling, and the rolled steel strip is rolled in one direction. By feeding the plate through the
A method for producing a rolled steel strip that requires multiple passes, characterized by producing a product steel strip and discharging the copper strip using a product steel strip discharging device. 2. A copper strip surface cleaning device is installed between the copper strip front and rear end connecting device and the tensioning device, and a rolling oil draining device and a surface cleaning device are installed between the copper strip rolling mill and the tensioning device. 2. The method for producing a rolled steel strip according to claim 1, wherein a product steel strip with excellent surface properties is produced regardless of the surface properties of the raw material steel strip to be rolled. 3. With a steel strip or stainless steel strip as the material to be rolled, a tension applying device is placed between the copper strip rolling machine and the copper strip winding device, and the tension applied to the copper strip is applied to the rolling zone and the winding zone. The rolled steel strip is rolled by applying high tension necessary for rolling to the copper strip in the rolling zone and low tension necessary for winding to the copper strip in the winding zone. 3. The method for manufacturing a rolled steel strip requiring multiple passes according to claim 1 or 2, characterized in that the product steel strip is wound up without inserting paper. Procedural amendment (spontaneous) January 31, 1991 1990 Patent Application No. 265256 2, Name of invention Method for manufacturing rolled steel strip requiring multiple passes 3, Relationship with the case of the person making the amendment Address of the patent applicant 2-6-3 Otemachi, Chiyoda-ku, Tokyo Name (
665) Nippon Steel Corporation 4, Agent 111 5, Detailed explanation of the invention in the specification subject to amendment, Contents of the amendment (1) Page 2, line 19 to page 3, 1 of the specification line, page 3, line 4, and page 7, line 7, “multiple passes” is “multiple passes”
I am afraid to correct it.

Claims (1)

[Claims] 1. In the production of rolled steel strip that requires multiple passes, a raw steel strip receiving device receives the rolled steel strip, two or more rolled steel strip unwinding devices, and a steel strip front and rear end connecting device are provided. , a rolling line in which a steel strip accumulator, a tensioning device, one or more steel strip rolling mills, a steel strip dividing device, and two or more steel strip winding devices are arranged in succession, and the steel strip Continuously rolling the rolled steel strip using an intermediate rolled steel strip return device that returns the intermediate rolled steel strip wound up by the winding device to the steel strip unwinding device for the next pass of rolling, A method for producing a rolled steel strip that requires multiple passes, characterized in that a product steel strip is produced by feeding and passing the rolled steel strip in one direction, and the steel strip is discharged by a product steel strip dispensing device. . 2. Install a steel strip surface cleaning device between the steel strip front and rear end connecting device and the tensioning device, and install a rolling oil draining device and a surface cleaning device between the steel strip rolling mill and the tensioning device. 2. The method for manufacturing a rolled steel strip requiring multiple passes according to claim 1, wherein a product steel strip with excellent surface properties is produced regardless of the surface properties of the raw material steel strip to be rolled. 3. The steel strip to be rolled is a stainless steel strip, and a tension applying device is arranged between the steel strip rolling machine and the steel strip winding device to apply tension to the steel strip between the rolling zone and the winding zone. The rolled steel strip is rolled by applying high tension necessary for rolling to the steel strip in the rolling zone and low tension necessary for winding to the steel strip in the winding zone. 3. The method for manufacturing a rolled steel strip requiring multiple passes according to claim 1 or 2, characterized in that the product steel strip is wound without inserting paper.