JPH0599575A - Foreign matter generation preventing system in heating furnace - Google Patents

Abstract

PURPOSE:To securely performing tracking and preventing foreign matters from being generated by applying marking to an end part of a bullet in the case where the bullet of different attribute is inserted and extracted for simultaneous rolling, and collating a confirmation result with tracking information. CONSTITUTION:A stelmore codling installation 7 is disposed on first and second strands as an adjusting cooling installation, and a new adjusting cooling installation 8 is disposed on a third strand. Further, many rough and first intermediate roller trains 3 are rolled, and a second intermediate roller train 4 and so on are rolled. There are provided a steel piece table 1 and a heating furnace 2 are disposed before the rough and intermediate roller 3 train, and are disposed a finishing roller 5, a wind-up roller 6, a collecting installation 9, a binding machine 10, and a coil dropping device 11 behind the second intermediate roller 4. Hereby, marking is applied on an end part of the bullet which is inserted into a heating furnace 2, and a recognition result is collated with tracking information. It is confirmed that the collated result is coincident to prevent foreign matters from being generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a multi-thread rolling mill is arranged in the rear stage for multiple strands, and billets having different attributes (steel type, product size) are alternately arranged. The present invention relates to a different material generation prevention system for a heating furnace that reliably tracks without generating different materials when performing simultaneous rolling of different steel types and different sizes that are sequentially or periodically charged into the heating furnace and sequentially extracted from the heating furnace. It is a thing.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 61-186102 discloses a difference in feed rate to a steel bar rolling line and a wire rod rolling line in the same rolling line due to a difference in rolling speed during bar rolling and rolling speed during wire rod rolling. A rolling method is described in which it is eliminated by providing a holding storage during rolling, the billet for bar steel is mixed with the billet for wire rod and heated in a heating furnace, and then rolled in the bar rolling line and wire rod rolling line of the same rolling line. Has been done.

However, although there is an idea of charging billets for steel bars and billets for wire rods alternately into a heating furnace, this is not the subject of the tracking application in the heating furnace. When billets with attributes (steel type, product size) are alternately or periodically charged into the heating furnace, and different steel types / sizes are simultaneously extracted from the heating furnace, tracking is performed reliably, and dissimilar materials are generated. Does not achieve to prevent.

[0004]

Conventionally, when rolling is performed in a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a single-thread rolling mill is arranged in the rear stage for multiple strands,
In each strand, billets that are rolled to the same steel type and same product size are generally rolled, and charging to the heating furnace was also done for each billet that was rolled to the same steel type and the same product size. In recent years, due to the stricter handling of delivery times to users, the progress of smaller lots, or the realization of new adjustment cooling equipment for users to omit processes, rolling to different steel types and different product sizes for each strand There is a strong demand for establishing a simultaneous rolling technology for different steel types and different sizes that can simultaneously and stably billet-roll billets.

As a technique for satisfying this demand, the present applicant has
In a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a multi-thread rolling mill is arranged in the rear stage for multiple strands, billets with different attributes (steel type, product size) are heated alternately or periodically according to the order of rolling. It is charged into the furnace, and each strand of the multi-thread rolling mill is sequentially extracted from the heating furnace, and during multi-thread rolling, billets of different steel types are rolled under the same rolling conditions of the same hole type and the same dimensions. The method for simultaneous rolling of different steel types and different sizes in a multi-strand mill, which is characterized by rolling a single-rolling rolling mill and rolling into different product sizes for each strand, September 3, 1991.
I applied for a patent on the 0th.

By the way, in the rolling mill, process control,
Tracking by a process computer is generally performed for collecting actual data and controlling the process. As a conventional tracking in a heating furnace, so-called block-based tracking is performed in lot units, and a method in which the operator visually confirms that lots are changed by, for example, spacing billet intervals at lot boundaries Was taken.

On the other hand, in order to cope with different steel type / different size simultaneous rolling in which billets having different attributes (steel type, product size) for each strand are rolled, billets having different attributes (steel type, product size) are alternated. Alternatively, it is necessary to periodically load into the heating furnace and sequentially perform extraction from the heating furnace. In such a case, the conventional tracking method in block units in the heating furnace has the following problems. ..

First, in the wire rod and bar mill, the number of billets in the heating furnace is large, and the actual billet is tracked with the occurrence of billet drop trouble or chattering or failure of the tracking sensor in the heating furnace. There is a case that the compatibility with the billet data in the computer is lost.

In addition, when billets having different attributes (steel type, product size) are alternately or periodically charged into the heating furnace, and different steel types and different sizes are simultaneously rolled such that they are sequentially extracted from the heating furnace, As mentioned above, even if the correspondence between the actual billet and the billet tracking data in the computer is only one billet, the attribute (different steel type, product size)
Will be recognized as different billets, leading to the generation of different materials.

The generation of different materials means that a product having completely different properties is shipped to the user, which may lead to a serious accident depending on the intended use of the product and must be absolutely avoided. There is a problem.

For this reason, billets having different attributes (steel type, product size) are charged into the heating furnace alternately or periodically,
In addition, it has been desired to establish a dissimilar material generation prevention system that reliably performs tracking without generating dissimilar materials even when performing simultaneous rolling of different steel types and different sizes that are sequentially extracted from the heating furnace.

Further, as a means for confirming that the attributes (steel type, product size) of adjacent billets in the heating furnace are different, the conventional method has the following problems.

[0013] First, in the method of changing the attributes (steel type, product size) and leaving a space between billets for several billets, the rolling ability per unit time is reduced.

Further, in the method of placing mortar on the first billet instead of the attributes (steel type, product size), if the billet falls down during transportation, the mortar will be removed.

Next, in the method of winding a bun wire on the first billet instead of attributes (steel type, product size), after extraction,
The van wire sticks to the billet to the rolling mill, causing surface defects.

The present invention solves the above problems and provides a billet having different attributes (steel type, product size) in a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a single-thread rolling mill is arranged in the rear stage for multiple strands. In order to prevent the occurrence of dissimilar materials, it is ensured that when different steel types and sizes are simultaneously rolled, which are alternately or periodically charged into the heating furnace, and are sequentially extracted from the heating furnace. The present invention provides a system for preventing the generation of foreign materials in a heating furnace.

[0017]

The present invention has the following structures.

The first is a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a multi-thread rolling mill is arranged in the rear stage for multiple strands, according to the order of rolling billets having different attributes (steel type, product size). When alternately or periodically charging the heating furnace and performing simultaneous rolling of different steel types and different sizes in which each strand of the multi-thread rolling mill is sequentially extracted from the heating furnace, charging is performed alternately or cyclically. Mark the end or end face of the billet having either one of the attributes to perform the billet, confirm the marking made on the billet at the time of charging into the heating furnace and / or extraction, and check the result for billet tracking. It is transmitted to the computer that is performing it and collated with the tracking information in the computer, and each time it is confirmed that the actual billet and the tracking information match. Is dissimilar prevention system of the furnace, characterized in that the Prevention of the dissimilar generated by.

The second is that during multi-threading rolling, each billet of different steel type is rolled under the rolling conditions of the same hole type and the same size, and after the rolling machine which becomes one thread rolling, different product sizes are obtained for each strand. This is a system for preventing the generation of foreign materials in the above heating furnace for rolling.

The third is a side looper for performing tensionless rolling between rolling mills of an intermediate rolling mill group constituting each one-thread rolling mill following multi-thread rolling, and the side looper extending over the entire length of the rolled material before and after the finishing rolling mill. This is a system for preventing the generation of foreign materials in the heating furnace described above, in which a measuring machine for measuring dimensions is arranged and rolling is performed for different product sizes.

The fourth point is that a twisting guide whose angle can be adjusted for each strand rolling section is provided on the exit side of the multi-thread rolling mill, and a loop is provided between the multi-roll rolling and the single-roll rolling. This is a foreign material generation prevention system for the above heating furnace in which a looper with a large amount of storage is arranged for rolling.

The dissimilar material generation prevention system of the heating furnace of the present invention has different attributes (steel type, product size) in a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a single-thread rolling mill is arranged in the rear stage for multiple strands. When billets of different types are charged alternately or periodically into the heating furnace and simultaneous rolling of different steel types and different sizes that are sequentially extracted from the heating furnace is performed, heat resistance is applied to the end or end surface of one of the billets with different attributes. Marking with paint, confirming the billet marking at the time of charging into the heating furnace and / or extraction from the heating furnace, and transmitting the result to the computer that is tracking the billet, and the tracking information in the computer The collation is performed each time to confirm that the actual billet and the tracking information match.

Marking only one of the billets having different attributes (steel type, product size) not only increases the acquisition time and work time required for marking when all the billets are marked, but also the heating furnace. This is because it takes too much time to check the billet marking at the time of charging into and / or extraction from the heating furnace.

Here, as a means for confirming the billet marking at the time of charging into the heating furnace and / or extraction from the heating furnace, a terminal of a computer in which the operator visually confirms the result and tracks the result of the billet. It is conceivable that the marking is automatically read by the billet marking reading device, and the result is transmitted to the computer that is tracking the billet.

Further, a set of billets having different attributes (steel type, product size) for charging billets having different attributes (steel type, product size) alternately or periodically into the heating furnace and sequentially extracting from the heating furnace. Depending on the combination of rolling sizes you want to perform or the installation status of adjusted cooling equipment such as Stelmore cooling equipment and new adjusted cooling equipment, etc.
Various combinations such as one-to-one, one-to-two, one-to-one, four-to-one, one-to-one, one-to-one-to-one are conceivable.

Next, a detailed description will be given with reference to the drawings.

FIG. 1 is a diagram showing an example of the layout of a multi-strand mill of wire to which the present invention is applied.

In FIG. 1, No. 1 strand and No.
Stelmore cooling equipment 7, No. 2 as a cooling equipment adjusted to 2 strands. A new adjusted cooling equipment 8 is provided on 3 strands. The coarse and one intermediate rolling mill train 3 are multi-rolling rolling, and the two intermediate rolling mill trains 4 and subsequent rolling are one-roll rolling. 1 is a steel slab, 2 is a heating furnace, 5 is a finish rolling mill, 6 is a winding machine, 9 is a bundling equipment, 10 is a bundling machine, and 11 is a coil unloading device.

FIG. 2 is a diagram showing the entire computer tracking system according to the present invention. The present invention is concerned with heating furnace tracking therein.

FIG. 7 shows a method of charging into and extracting from a conventional heating furnace. Here, lot X is a set of billets of the Stelmore cooling target material, and lot Y is a set of billets of the new adjusted cooling target material. As described above, since loading and extraction are performed in lot units, tracking is also performed in block units. Further, at the boundary where the billet attributes (steel type, product size) change from the lot X billet to the lot Y billet, the billet pitch (billet interval) is set to be several billets.

When rolling the lot X, the No. No. in which the Stelmore cooling equipment is installed is used. 1 strand and No. 1 No. 2 which uses two strands and is equipped with new conditioning and cooling equipment. 3 strands are stopped waiting for extraction.

When the lot Y is rolled, the number of the new adjustment cooling equipment is set to No. No. 3 with 3 strands and Stelmore cooling equipment is installed. 1 strand and No. 1 Two strands are stopped waiting for extraction.

FIG. 3 shows a method of charging into and extracting from a heating furnace to which the present invention is applied. In order to enable continuous extraction without any rolling stop on any strand, the billet X of Stelmore cooling target material
And the billet Y, which is the newly adjusted cooling target material, are alternately and periodically charged into the heating furnace at a ratio of 1: 2.

Here, the marking on the end face or the end of the billet is performed on the billet Y of the newly adjusted cooling target material.

FIGS. 4A and 4B are views showing an example of marking on the end face or end of the billet according to the present invention. In FIG. 4 (a), the upper surface of the billet end is marked with paint so that the operator can visually confirm it from the operator's cab when charging the heating furnace. In FIG. 4B, the billet end face is marked with heat-resistant paint so that the operator can visually confirm it on the television monitor in the driver's cab when extracting the heating furnace.

FIG. 5 shows a collation flow of billet tracking data according to the present invention. Each time a billet is loaded and / or extracted, it is checked whether the billet is a marking target billet, and if the billet is a marking target billet, an alarm notifying the confirmation of the marking is output from the computer terminal performing the billet tracking. The operator confirms whether or not there is billet marking, and inputs the result from the computer terminal. In the computer, the input data and the billet tracking data are collated, and it is checked whether they match or not. If they do not match, an alarm is output from the computer terminal to ensure tracking consistency for the operator. Notify that there is not.

[0037]

EXAMPLES First, equipment conditions will be described.

Walking beam type heating furnace, N in front
o. 1-strand rolling, No. 2 strand rolling and No. A multi-strand mill in which a three-thread rolling mill train consisting of three-strand rolling and a one-thread rolling mill train of one-strand rolling for three strands were arranged in the subsequent stage was prepared. During the three-pass rolling, rolling conditions of the same hole type and the same dimensions were used. Three
The main rolling mill row includes 12 rolling mill groups (No. 1 to No.
12 stands), and the single rolling mill train was composed of 14 rolling mill groups (No. 13 to No. 26 stands).

A row of two intermediate rolling mills (No. 13 to No. 26) constituting each row of one rolling mill following the row of three rolling mills.
A side looper for performing tensionless rolling is provided between each of the rolling mills (stands), and a measuring machine for measuring dimensions over the entire length of the rolled material is arranged before and after the finishing rolling machine following the two intermediate rolling mill rows. A twist guide with an adjustable angle for each strand is installed on the outlet side of the rolling mill that requires twisting of the rolling mill train for three-roll rolling (coarse and one intermediate rolling mill train) from three-roll rolling to one-roll rolling. A looper with a large loop storage amount was placed between the rolling mills to be transferred.

No. 1 strand and No. 1 A finish rolling mill, a winder, and a Stelmore cooling facility were arranged after each two intermediate rolling mill rows (No. 13 to No. 16 stand) of two strands. No. A finish rolling mill, a winder, and new adjusted cooling equipment were arranged after the row of two intermediate rolling mills (No. 13 to No. 16 stand) of 3 strands.

Next, the operating conditions will be described.

No. 1 strand and No. 1 Billet of low carbon steel that is rolled with 2 strands (cross-sectional dimension: 1
22 mm × 122 mm, length: 18,000 mm, unit weight: about 2 t) 2 pieces, and No. A billet of special welding steel that is rolled with 3 strands (section size: 122 mm x 1
22mm, length: 18,000mm, unit weight: about 2t) 1
The books were alternately (periodically) charged into a walking beam furnace and extracted into each given strand of a rolling mill train of three-thread rolling.

Before charging into the walking beam type heating furnace, the upper surface of the end portion of the billet of the special welding steel was marked with heat resistant paint. The operator visually confirms the markings made on the billet during charging and extraction into the heating furnace, and the results are transmitted to the computer that is tracking the billet and collated with the tracking information in the computer. In each case, we confirmed that the actual billet and the tracking information matched, and tried to prevent the generation of foreign material.

After that, rolling was performed at a finishing rolling speed of 51 m / sec to roll 45 billets per hour.

[0045]

PRIOR ART No. 1 using the multi-strand mill used in the examples. 1 strand and No. 2 billets of low carbon steel (6.5φ) rolled with 2 strands and N
o. Special welding steel (5.5 for rolling with 3 strands)
One billet of φ) is alternately charged into the walking beam type heating furnace at intervals of two billets and extracted from the heating furnace. Rolling is performed at a finishing rolling speed of 51 m / sec for 1 hour. 36 billets were rolled per hit.

FIG. 6 shows that the billets adjacent to each other in the heating furnace have different attributes (steel type, product size) from each other in order to recognize that they have different attributes (steel type, product size). A comparison of the rolling capacities at the time of simultaneous rolling of different steel types and different sizes in the case of the above-mentioned conventional example in which the billets are spaced apart from each other by two billets. It is shown that the rolling ability of the present invention is about 1.3 times higher.

[0047]

According to the present invention, in a multi-strand mill for wire rods, billets having different attributes (steel type, rolling size) are charged alternately or periodically into a heating furnace and are sequentially extracted from the heating furnace. When performing simultaneous rolling of steel types and different sizes, it is possible to reliably perform tracking and prevent the generation of different materials. As a result, it is possible to industrially perform simultaneous rolling of different steel types and different sizes, and it is possible to improve the production capacity.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of a layout of a multi-strand mill to which the present invention is applied.

FIG. 2 is an overall explanatory diagram of a computer tracking system according to the present invention.

FIG. 3 is a diagram showing an example of a method for charging into and extracting from a heating furnace to which the present invention is applied.

FIG. 4A is a perspective view showing an example of billet marking on the upper surface of the billet end portion according to the present invention.
(B) is a perspective view showing billet marking on the billet end face in the present invention.

FIG. 5 is a diagram showing a collation flow of billet tracking data according to the present invention.

FIG. 6 Attributes of adjacent billets in the heating furnace (steel type,
In order to confirm that the product size is different, the rolling performance (per hour) when the heat resistant paint of the present invention is used and when two billets are spaced apart from each other between adjacent billets having different conventional attributes It is a figure which shows the comparison of the rolling number of.

FIG. 7 is a diagram showing an example of a method for charging into and extracting from a conventional heating furnace.

[Explanation of symbols]

 1 Steel piece stand 2 Heating furnace 3 Rough and 1 Intermediate rolling mill train 4 2 Intermediate rolling mill train 5 Finishing mill 6 Winder 7 Stelmore cooling facility 8 New adjustment cooling facility 9 Focusing facility 10 Bundling machine 11 Coil unloading device

Claims (4)

[Claims] 1. In a multi-strand mill in which a multi-thread rolling mill is arranged in the front stage and a multi-thread rolling mill is arranged in the rear stage for multiple strands, billets having different attributes (steel type, product size) are alternately arranged according to the order of rolling. Alternately or cyclically, when charging into a heating furnace periodically and performing simultaneous rolling of different steel types / sizes in which each strand of the multi-thread rolling mill is sequentially extracted from the heating furnace, charging is performed alternately or periodically. Mark the end or end face of the billet with either attribute of the billet, check the marking made on the billet at the time of charging into the heating furnace and / or when extracting from the heating furnace, and check the result of the billet. It is transmitted to the tracking computer and collated with the tracking information in the computer, and each time it is confirmed that the actual billet and the tracking information match. A foreign material generation prevention system for a heating furnace, which is designed to prevent the generation of foreign materials by checking. 2. During multi-thread rolling, billets of different steel types are rolled under rolling conditions of the same hole type and the same size, and each strand is rolled into a different product size after the single-roll rolling mill. The foreign material generation prevention system for a heating furnace according to claim 1. 3. A side looper for tensionless rolling is provided between rolling mills of an intermediate rolling mill group constituting each one-thread rolling mill following multi-thread rolling, and dimension measurement is performed over the entire length of the rolled material before and after the finishing rolling mill. The dissimilar material generation prevention system for a heating furnace according to claim 1 or 2, wherein a measuring machine for performing the above is arranged to perform rolling to different product sizes. 4. A twist guide having an adjustable angle for each strand is provided on the exit side of the multi-thread rolling mill, and a large loop storage amount is provided between the multi-roll rolling and the single-roll rolling mills. A looper is arranged and rolling is performed.
A system for preventing generation of foreign material in a heating furnace according to any one of items.