JP2937779B2 - Billet dissimilar material prevention method and billet arrangement device for multi-strand mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

In billet sequences apparatus before heating furnace charging be produced by hot rolling a steel bar and wire BACKGROUND OF THE, different attributes (type of steel, finished product size) billets alternately follow Tsu <br/> the rolling sequence Or a multi-strand mill that reliably tracks without generating dissimilar materials when periodically charged into the heating furnace
The present invention relates to a method for preventing billet dissimilar material generation and a billet arrangement device .

[0002]

2. Description of the Related Art The following method is described as a method for identifying billets charged in a heating furnace.

Japanese Patent Publication No. 58-47452 discloses a method in which graphite is applied to the front or last steel surface of each lot and charged into a heating furnace, whereby the graphite is whitened by heating to identify the lot boundary. A method is described.

However, although this seems to be effective in identifying lot boundaries when billets are continuously charged,
In the case where billets of different steel types and different sizes are charged into the heating furnace alternately or periodically, graphite is applied and discriminated in units of at least one BT, which is not considered to be a very effective means.

Japanese Patent Application Laid-Open No. 1-189489 discloses an apparatus for identifying a steel material during or after passing through a heating furnace. This method seems to be effective for tracking steel material flowing continuously in the furnace.
It cannot be determined whether the billets are of different sizes.

Japanese Unexamined Patent Publication (Kokai) No. 3-32423 describes a method of reading and tracking engraved characters on the end face of a steel material when the steel material is transported from a continuous casting factory to a billet factory by a steel material transporting trolley.

Although this method is considered effective for tracking between processes, when billets of different steel types and different sizes are charged into the heating furnace alternately or periodically,
It is also necessary to have a function of ensuring that the number of billets in the transported group matches the number of read bills and to ensure that the bills are paid out in the order in which they are loaded.

[0008]

Conventionally, when rolling is performed in a multi-strand mill in which a multi-strand mill is arranged at the front stage and a single-roll mill at the rear stage, the same applies to any of the strands. It is common to roll to the same type of steel and the same product size, and the heating furnace is also charged for each billet to be rolled to the same type of steel and the same product size. In the conventional method, the frequency of rolling size change has increased, and the production efficiency has been inevitably reduced. As a countermeasure, a method of simultaneously rolling billets of different steel types and different sizes is required.

This method is disclosed in Japanese Patent Application Laid-Open No. 5-9220.
Japanese Patent Application Laid-Open No. H05 (1993) describes a system tracking method for the simultaneous rolling of different steel types and different sizes in the No. 1 multi-strand mill.
-99575 filed a patent application for a heating furnace dissimilar material prevention system.

The process of the present invention is a part relating to a process of arranging billets for charging billets of different steel types and different sizes alternately or periodically into a heating furnace in the rolling order. It is to show how to realize it.

By the way, in a rolling mill, process control,
Tracking by a process computer is generally performed for performance data collection, process control, and the like.

Heretofore, when charging into a heating furnace, the lot is identified by marking the end or end face of the billet at the turn of the lot or by leaving the billet at intervals.

When billets of different steel types and different sizes are charged into the heating furnace alternately or periodically, even if the correspondence between the actual billet and the tracking data in the computer is shifted by one billet, the attribute ( Since different billets with different steel types and different sizes) are recognized, different materials are generated.

The occurrence of a different material is a trouble that must be avoided because there is a danger of causing a serious accident depending on the use of the product because a product having completely different properties is shipped to the user. .

For this reason, when billets of different steel types and different sizes are charged into a heating furnace alternately or periodically according to the order of rolling, a billet dissimilar material generation that reliably and automatically performs tracking without generating dissimilar materials. It was desired to establish a prevention system.

[0016]

The gist of the present invention is as follows.

The first is before the heating furnace for the multi-strand mill.
The billet different attributes of Place two or more billets sequences apparatus for stacking individually, the inlet of the billet array device, the billet marked letters and symbols on the end face 該文
It is equipped with a device that reads characters and symbols , transmits the read results to a computer that performs tracking, checks the actual product, and pays out while matching the loading order in the computer. Of billet dissimilar material
Is the way .

The second is a crane that supplies billets to the entrance of the billet arranging device. In the crane, the actual result of the transportation is transmitted to the computer by induction radio, and compared with the tracking information. The billet dissimilar material generation preventing method according to the item 1, wherein a required number of billets is carried.

No. 3 is to read the characters and symbols one by one in the course of transporting the billets with the characters or symbols marked on the end faces side by side as a group so as to be adjacent on the side. a method for, characterized in that to check the number of read and billet number of the group meets its
A method for preventing generation of dissimilar billet according to item 1 .

The fourth aspect is the method for preventing generation of dissimilar billet according to the first aspect, wherein inching control is performed by a dock so that one billet falls into a V-groove before dispensing of the billet arrangement device.

The fifth is the number of billets in the group being paid out and the number of billets paid out, and the number of billets before the group is paid out.
Paying out the next group of billets by counting the letts
2. A billet dissimilarity prevention method according to claim 1, wherein a position behind the group in the billet is calculated, and the billet is always accumulated before the payout by the billet arranging device.
Is the law .

Part 6 is before the heating furnace for the multi-strand mill.
Two or more billets with different attributes
A billet aligning device is arranged, and the billet aligning device inlet
The billet with a letter or symbol marked on the end face
It is characterized by having a device for reading characters and symbols
This is a billet arrangement device for a multi-strand mill.

No. 7 is before dispensing the billet arrangement device.
Is provided with a V-groove, and one billet is dropped into the V-groove.
Provide a dock that can be controlled
6. The multi-strand mill billet according to item 6,
Arranging device.

[0024]

Next, the present invention will be described in detail with reference to the drawings.

The combinations of billets having different attributes (steel type, product size) for alternately or periodically charging billets having different attributes (steel type, product size) and sequentially extracting from the furnace are as follows. Various combinations such as 1: 1, 1: 1, 1: 4, 1: 6 are possible.

Therefore, it is necessary to charge the heating furnace without fail in accordance with these combinations.

FIG. 1 strand and NO. 2
Stellmore cooling equipment as adjustment cooling equipment on the strand,
NO. The layout of a multi-strand mill to which the present invention is applied, which has a new adjustment cooling facility on three strands, and the coarse and one intermediate rolling mill rows are three-roll rolling, and the second intermediate rolling mill rows are one-roll rolling. This is an example. The billet arranging device has the NO. 1 strand and NO. Billet arrangement device 1 for two strands and NO. Two billet arrangement devices 2 for three strands are installed.

FIG. 2 shows a billet arranging apparatus to which the present invention is applied and a method for charging and extracting billets in a heating furnace. It is possible to continuously extract any strand without stopping rolling. No. 1 strand and N
O. No. 2 billet X and NO. Billets Y of three strands are alternately and periodically charged into the heating furnace at a ratio of 1: 2. With the two billet arranging devices, the billet X is placed on the billet arranging device 1 and the billet Y is placed on the billet arranging device 2, and the billet is paid out at a ratio of 1: 2.

FIG. 3 is a diagram showing an entire computer-tracking system according to the present invention, which relates to a tracking system from a crane to a heating furnace.

FIG. 4 is a collation flow chart of crane tracking data. The lot information (loading number, number, billet arrangement device 1 or billet arrangement device 2) is received from the host computer at the crane terminal, and after the billet is transported, the number, the result of billet arrangement device 1 or billet arrangement device 2 are input. To do. The host computer checks the data to see if there are any remaining units in the charging unit. If not,
Notify with an alarm and verify the actual product and correct the results.

FIG. 5 shows an automatic reading device at the entrance of the billet arrangement device. FIG. 6 is a diagram illustrating the operation of the automatic reading device and the billet aligning device at the entrance of the billet aligning device. FIG. 7 is a flowchart of the comparison of the read data.

The billets conveyed to the entrance of the billet arranging device are arranged in groups such that the mobile devices equipped with a CCD camera for reading the characters on the billet end face are grouped so that the billets are adjacent to each other on the side face after the tip positions are aligned by a roller gang. After the sheet is conveyed to the side, it moves along the billet group and performs reading while detecting the gap between billets with a billet cutout sensor (when billet gap detection is not possible, reading is performed in billet width dimension units).

This reading device takes advantage of the fact that when the mark portion of the billet is illuminated with illumination, a shadow is formed on the mark and the portion without the mark becomes bright, and the image is taken with a high-speed shutter camera. In this method, after performing processing such as binarization, a similar character is searched for while comparing with a reference dictionary, and an engraved character is read.

In this reading apparatus, when the leading ends are not aligned due to friction between billets or the like, there are times when a recessed billet is erroneously recognized as the last part of the reading billet. Therefore, a method was adopted in which the number of billets was counted with a limit switch, and the number of billets was checked against the screen number of billets read.

FIG. 8 is an explanatory view of the billet arrangement of the two billet arrangement devices. FIG. 9 is a flowchart illustrating a method of alternately dispensing billets at a certain ratio from two billet arrangement devices.

After the reading is completed, the number of billets in the group and the number of billets paid out are counted so that the billets are always accumulated before the payout by the billet arranging device. The position of the next group of billets is calculated, and the group of billets is conveyed until immediately thereafter.

In order to enable payout of each billet by position control of the billet arranging device, the V
The inching was controlled with a dock so that the billet could be dropped one by one into the groove.

Conventionally, a proximity sensor for detecting the billet position has been used. However, the frictional resistance between the billet and the rail has changed, so that the billet stop position fluctuates by about 20 to 100 mm, and the billet behind the billet is sometimes paid out.

In some cases, the billet was moved to a fixed position by the stopper. However, the billet was bitten by the stopper and could not be dispensed, or even if the billet could be dispensed, the billet at the back was also dispensed.

In view of the above, according to the present invention, the billing is controlled by inching with a dock so that the billet can be dropped one by one into the V-groove before dispensing.

When billets having different attributes (steel type, product size) are charged into a heating furnace alternately or periodically by two or more billet arranging apparatuses, a system for judging from which billet arranging apparatus to pay out the billet is provided. is necessary.

This is performed by the following method. First, charging lot information (loading Mo, number of pieces, billet arranging device 1 or billet arranging device 2) is received from a host computer by a computer,
Based on the information, the process controller outputs a payout command to the sequencer of the billet arranging device when charging can be performed on the heating furnace sequencer side. When the payout kicker of the billet arranging device that has been instructed operates and there is a billet on the charging roller gang, a signal indicating that the payout has been completed is transmitted to the process control. In the programmable controller, the billet is charged into the heating furnace when it becomes possible to load the data on the heating furnace sequencer side, and then the data is moved as data on the heating furnace side into the programmable controller. Although the above processing is performed automatically, the same processing is performed after checking the billet consistency and the like when a backup is manually performed.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the conditions of the equipment will be described.

Walking beam type heating furnace, pre-stage coarse and one intermediate rolling mill train (NO.1 to NO.2 strand)
, And a multi-strand mill in which one-strand rolling single-row rolling mill row (NO.13 to NO.26 strand) is arranged for three strands at the subsequent stage.

No. 1 strand and NO. Steermore cooling equipment as an adjustment cooling equipment for two strands, NO. 3
New conditioning cooling equipment was installed on the strand.

Next, the operating conditions will be described.

NO. Steel type A rolled on 3 strands
Billet (cross-sectional dimension: 122 mm x 122 mm, length: 18,000 mm, unit weight: about 2 ton) and N
O. 1 strand and NO. Billet of steel type B to be rolled with two strands (cross-sectional dimension: 122 mm x 122 m
m, length: 18,000 mm, unit weight: about 2 ton)
One billet was discharged from the billet arranging device 2 and two billets from the billet arranging device 1 alternately at a ratio of 1: 2, and the billet was charged into a walking beam type heating furnace.
Extraction was performed on each predetermined strand of the rolling mill row of the continuous rolling.

Before loading into the walking beam type heating furnace, the following system tracking was performed to prevent foreign materials.

As shown in FIG. 4, lot information (40 billets of steel type B in the billet arranging apparatus 1 and 40
41 shows a billet 20 of steel type A
When the book was received and the billet was transported to the billet arrangement device entrance, the results were input in units of four.

The host computer collated the data to see if the charging unit had the number.

As shown in FIGS. 5, 6, and 7, after the four billets conveyed to the entrance of the billet arranging device 1 are aligned with the tip end by a roller gang, the engraved characters (charge NO, A mobile device equipped with a CCD camera that reads a bloom billet number is conveyed side by side as a group so that the billets are adjacent to each other on the side, and then moves along the group of billets. Reading was performed while detecting the gap between billets with a billet cutout sensor (when billet gap detection was not possible, the billet width was read in units of 122 mm).

Further, it was confirmed by the limit switch below the billet at the reading position that the number of billets was equal to the number of readings.

After the reading is completed, the billet is always accumulated before the payout by the billet arranging device.
Based on the number of billets in that group and the billet payout results,
By counting the billets before the payout, a billet group having a billet width of 122 mm × 4 billets / 490 mm was conveyed by a dock with a gap of 50 mm immediately behind the previous billet group. The billet group conveyed to the entrance of the billet arrangement device 2 did the same.

Inching control was performed with a dock so that one billet would surely fall into the V-groove before being dispensed and pushed.

Next, the charging lot information (charging NO 1240 as billing arrangement device 1
Received 40 billets of steel type B and 20 billets of steel type A in the billet aligning apparatus 2 as charging NO1241), and confirmed that the heating furnace sequencer could insert the billets based on the information. One billet from the billet arranging device 2 was alternately dispensed from the billet arranging device 1 at a ratio of 1: 2.

[0056]

According to the present invention, in a multi-strand mill of a wire rod, billets for charging into a heating furnace alternately or periodically according to the order in which billets of different attributes (steel type, product size) are rolled. When performing this, it is possible to reliably perform tracking and prevent the occurrence of dissimilar materials.

This makes it possible to industrially perform simultaneous rolling of different steel types and different sizes.

[Brief description of the 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 explanatory view showing a billet arrangement apparatus to which the present invention is applied and a method for charging and extracting billets in a heating furnace.

FIG. 3 is an explanatory diagram showing the entire computer-tracking system according to the present invention.

FIG. 4 is a collation flow chart of crane tracking data.

FIG. 5 is an explanatory view of an automatic reading device at the entrance of the billet arrangement device.

FIG. 6 is a view for explaining the operation of the automatic reading device and the billet aligning device at the entrance of the billet aligning device.

FIG. 7 is a flowchart of a comparison of read data.

FIG. 8 is an explanatory view of a billet arrangement of two billet arrangement devices.

FIG. 9 is a flowchart illustrating a method of periodically paying out billets alternately at a certain ratio from two billet arranging devices.

[Explanation of symbols]

1: Billet arrangement device 2: Billet arrangement device

Continuation of the front page (72) Inventor Masahiro Ishimaru 23-15 Suzukocho, Kamaishi City Inside Nippon Steel Corporation Kamaishi Works (56) References JP-A-5-92201 (JP, A) JP-A-5-92 99575 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 1/16, 37/00, 45/00 B21C 51/00 C21D 9/00

Claims (7)

(57) [Claims] 1. Different before heating furnace for multi-strand mill
At least two billet arranging devices for individually loading attribute billets are arranged, and at the entrance of the billet arranging device, a device for reading the characters or symbols of the billet with the characters or symbols marked on the end face is arranged and read. The results are sent to the tracking computer and the actual product is checked.
A billet dissimilarity prevention method, wherein payout is performed while matching the charging order in the computer. 2. In a crane for supplying a billet to an entrance of a billet arranging device, the result of transportation is transmitted to a computer by induction radio, collated with tracking information, and necessary for the billet arranging device instructed by a host computer. billet dissimilar prevention method according to claim 1, wherein the carrying the billet number. 3. A method of reading a character or a symbol for each billet while the billet having a character or a symbol marked on an end face is conveyed side by side as a group so as to be adjacent to each other on a side surface. 2. The method according to claim 1, further comprising checking whether the number of billets matches the number of read billets . 4. A billet dissimilar prevention method according to claim 1, characterized in that the inching control dock to drop one billet V groove before payout of the billet array device. 5. The billet before paying out the group is determined based on the number of billets in the group being paid out and the billet payout result.
By counting, the billet of the next group in the payout
2. The billet dissimilar material prevention method according to claim 1, wherein the position behind the group is calculated, and the billet is always accumulated before the payout by the billet arranging device. 6. A heating apparatus for a multi-strand mill, wherein
Two or more billets that individually load billets with different attributes
Arrange the arrangement device and enter the billet arrangement device To the end face
The character or symbol of the billet marked with the character or symbol
A multi-storage device characterized by comprising a reading device
Billet arrangement device for land mill. 7. A V-groove is formed before the billet arranging device is dispensed.
Inching so that one billet falls into the V-groove
It is characterized by having a dock that can be controlled
7. A billet arrangement for a multi-strand mill according to claim 6.
Place.