JP2652290B2 - Prevention of dissimilar materials in heating furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a multi-strand mill for rods in which a multi-strand rolling mill row is arranged at the front stage and a single-strand rolling mill row is arranged at the rear stage for multi-strands, with different attributes (steel type, product size). )) The billet is alternately or periodically charged into the heating furnace, and when the simultaneous rolling of different steel types and different sizes is sequentially performed from the heating furnace, the tracking of the heating furnace that ensures the tracking without generating the different material is performed. The present invention relates to a method for preventing generation of dissimilar materials.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 61-186102 discloses a difference between a feeding speed to a steel bar rolling line and a wire rod rolling line in the same rolling line due to a difference between a rolling speed in bar rolling and a rolling speed in wire rod rolling. A rolling method that eliminates by providing a holding storage in the middle of rolling, heats in a heating furnace with a billet for wire rods and a billet for wire rods, and then performs rolling in a bar rolling line and a wire rod rolling line of the same rolling line is described. Have been.

[0003] However, there is an idea that billets for steel bars and wire rods are alternately charged into a heating furnace, but the tracking method in the heating furnace is not mentioned, and this is an issue of the present application. In the case where billets of attributes (steel type, product size) are charged into the heating furnace alternately or periodically, and different steel types and different sizes are simultaneously extracted from the heating furnace, tracking is performed reliably, and different materials are generated. Does not achieve the prevention.

[0004]

Conventionally, when rolling is carried out in a multi-strand mill of a bar and wire in which a multi-strand rolling mill row is arranged at the front stage and a single rolling mill row is arranged at the rear stage for multi-strands. It is common to roll billets to be rolled to the same steel type and same product size even for the strands, and charging to the heating furnace was also performed for each billet to be rolled to the same steel type and same product size, recent years,
Due to stricter delivery schedules and smaller lots for users, and the realization of new adjustment cooling equipment to reduce the number of processes by users, billets that roll to different steel types and different product sizes for each strand have been developed. At the same time, there is a strong demand for establishing a simultaneous rolling technology of different steel types and different sizes that can be rolled stably without any trouble.

As a technology satisfying this demand, the present applicant has
In a rod multi-strand mill in which a multi-strand rolling mill row is arranged in the first stage and a single-strength rolling mill row is arranged in the subsequent stage for multiple strands, billets having different attributes (steel type, product size) are alternately rolled in the order of rolling. Or, it is charged into a heating furnace periodically, and each strand of the multiple rolling mill is sequentially extracted from the heating furnace, and during the multiple rolling, different attributes are applied under the same hole shape and the same dimension rolling conditions. (Steel type, product size) Rolling of billets of different types and sizes in multi-strand mills of bar wires, characterized in that rolling is performed to a different product size for each strand after the rolling mill row, which is a single continuous rolling. A patent application for the simultaneous rolling method was filed on September 30, 1991.

[0006] In the rolling mill, process control, performance data collection, tracking by a process computer for process control and the like are generally performed. The tracking in the conventional heating furnace, and tracking by the so-called block of each lot is performed, that batch is replaced by such spaced billet interval boundaries lots manner operator visually confirmed Had been taken.

On the other hand, in order to cope with the simultaneous rolling of different steel types and different sizes in which billets having different attributes (steel type and product size) are rolled for each strand, billets having different attributes (steel type and product size) are alternately formed. Or, it is necessary to charge the furnace periodically and extract it sequentially from the furnace.
In the tracking method by, it has the following problems.

[0008] First, the wire, the steel bars mill often billet number of standing furnace in a heating furnace, generation or tracking sensors chattering such billets fall trouble in the heating furnace, the occurrence of a failure or the like, the actual billet and tracking May not be compatible with the billet data in the computer performing the

In the case of simultaneous rolling of different steel types and different sizes, billets having different attributes (steel type, product size) are alternately or periodically charged into a heating furnace and sequentially extracted from the heating furnace. the as correspondence between billet tracking data within real billet and computer 1
Alone it was not a billet content, attributes (different steel types, finished product size) so will recognize different billet, leading to the occurrence of different materials.

Here, the occurrence of different materials means that products having completely different properties are shipped to users,
Depending on the intended use of the product, it may lead to serious accidents and is a problem that must be avoided.

For this reason, billets having different attributes (steel type, product size) are charged into the heating furnace alternately or periodically.
And it was successively without causing a dissimilar even in the case of performing the different steel types, different sizes simultaneously rolling extracted from the heating furnace, desired to establish reliably dissimilar prevention method of tracking may have rows.

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

[0013] First , a method in which the intervals between billets are set to several billets in place of the attributes (steel type, product size) leads to a reduction in rolling capacity per unit time.

[0014] In addition, the attribute (type of steel, finished product size) in the method of placing the mortar on top of the first run of the billet of Me instead of, when the billet has been falling during transport, would take the mortar.

Next , in the method of winding a bun wire on the first billet instead of the attribute (steel type, product size), after extraction, the bun wire remains attached to the billet until the rolling mill. , Causing surface flaws.

The present invention solves the above-mentioned problems, and in a multi-strand mill of a bar and wire in which a multi-strand rolling mill row is arranged in a first stage and a single-strength rolling mill row is arranged in a second stage, different attributes (steel type, In order to prevent the generation of dissimilar materials, billets of different sizes are charged alternately or periodically into the heating furnace, and tracking is performed reliably when simultaneous rolling of different steel types and different sizes is sequentially performed from the heating furnace. The object of the present invention is to provide a method for preventing generation of dissimilar materials in a heating furnace.

[0017]

The gist of the present invention is as follows.

The first is a rod-type multi-strand mill in which a multi-strand rolling mill row is arranged at the front stage and a single-strand rolling mill row is arranged at the rear stage for multiple strands, and billets having different attributes (steel type, product size) are arranged. In the case where the different steel types and different size simultaneous rolling to be charged into the heating furnace alternately or periodically according to the rolling order and extracted from the heating furnace sequentially to each strand of the multiple rolling mill are performed alternately or Marking is performed on the end or end face of the billet of one of the attributes of the billet that is charged periodically, and the marking made on the billet at the time of charging and / or extraction into the heating furnace is confirmed. Is transmitted to the computer that performs the billet tracking, and is compared with the tracking information in the computer. Each time, the actual billet and the tracking information match. Dissimilar prevention side of the furnace, characterized in that the Prevention of the dissimilar generated by confirming that
Is the law .

The second is that during billet rolling, each billet of a different steel type is rolled under rolling conditions of the same hole shape and dimensions, and different product sizes are obtained for each strand after the rolling mill row where single rolling is performed. This is a method for preventing generation of dissimilar materials in the heating furnace described above.

No. 3 is a side looper for performing tensionless rolling between the rolling mills of the intermediate rolling mill group constituting each single rolling mill row following the multiple rolling mill, and the side looper before and after the finish rolling mill has a length corresponding to the entire length of the rolled material. Prevent the generation of dissimilar materials in the above-mentioned heating furnace, which is equipped with a size measuring machine that measures the entire dimension and performs rolling to different product sizes
Is the way .

No. 4 is to provide a torsion guide capable of adjusting the angle for each strand rolling section on the exit side of the rolling mill row of the multi-rolling, between rolling mill rows which shifts from multi-rolling to single-rolling. The above is a method for preventing generation of dissimilar materials in a heating furnace, in which a looper having a large loop storage amount is arranged for rolling.

The method for preventing generation of dissimilar materials in a heating furnace according to the present invention is applied to a multi-strand mill of a bar having a multi-strand rolling mill row at the front stage and a single-strand rolling mill row at the rear stage for multiple strands. (Steel type, product size) Billets with different attributes are charged alternately or periodically into the heating furnace, and when the simultaneous rolling of different steel types and different sizes is successively extracted from the heating furnace, the end of one of the billets with different attributes Marking on the part or end face with heat-resistant paint, confirming the billet marking at the time of charging into the heating furnace and / or extracting from the heating furnace, and transmitting the result to the computer that performs billet tracking; The tracking information is compared with the tracking information, and each time, it is confirmed that the actual billet matches the tracking information.

Marking only one of the billets having different attributes (steel type, product size) is not only necessary for marking all billets, but also increases the acquisition time and work time required for marking, and also increases the heating time. This is because a lot of trouble is also required for confirming the billet marking at the time of charging into the container and / or extracting from the heating furnace.

Here, as means for confirming the billet marking at the time of charging into the heating furnace and / or extracting from the heating furnace, a terminal of a computer which visually confirms the result by an operator and tracks the billet is used. For example, it is conceivable that the marking is automatically read by a billet marking reading device which is input from a computer and the result is transmitted to a computer which performs billet tracking.

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 the billets from the heating furnace. Depending on the combination of the rolling size to be performed or the installation condition of the adjustment cooling equipment such as the Stealmore cooling equipment and the new adjustment cooling equipment, etc.
Various combinations such as one-to-one, one-to-two, one-to-one, one-to-one, one-to-one, and one-to-one are possible.

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

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

In FIG. No. 1 strand and No.
Steermore cooling equipment 7, No. 2 as an adjustment cooling equipment for two strands Newly controlled cooling equipment 8 is provided on three strands. The coarse and first intermediate rolling mill rows 3 are subjected to multiple rolling, and the second intermediate rolling mill rows 4 and thereafter are subjected to single rolling. 1 is a billet stand, 2 is a heating furnace, 5 is a finishing mill, 6 is a winding machine, 9 is a bundling device , 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 method of the present invention. The present invention is Ru engages the furnace tracking in this.

FIG. 7 shows a conventional method of charging a heating furnace and extracting the same from the heating furnace. Here, the lot X is a set of billets of the steermore cooling target material, and the lot Y is a set of billets of the newly adjusted cooling target material. Since charging and extraction are performed in units of lots, tracking is also performed in units of blocks. Also, at the boundary where the billet attributes (steel type, product size) change from the billet of lot X to the billet of lot Y, the billet pitch (billet interval) is separated by several billets.

[0031] When performing the rolling lots X is, No. of Suterumoa cooling facility is located No. 1 strand and No. No. 2 in which the new adjustment cooling equipment is arranged using two strands. Three strands are stopped waiting for extraction.

[0032] When performing the rolling lot Y is, No. of new adjustment cooling facility is located Using 3 strands,
No. in which the stealmore cooling equipment is arranged. No. 1 strand and No. Two strands are stopped waiting for extraction.

FIG. 3 shows a method of charging a heating furnace and extracting from the heating furnace to which the method of the present invention is applied. In order to make it possible to extract continuously without causing a rolling stop in any strand, the billet X of the stermore cooling target material and the billet Y of the newly adjusted cooling target material are supplied to the heating furnace at a ratio of 1: 2. They are charged alternately and periodically.

[0034] Here, the marking of the billet end face or end portion are rope lines <br/> against the billet Y new modulated cooling target material.

FIGS. 4A and 4B are diagrams showing examples of marking on the billet end face or end by the method of the present invention. In FIG. 4 (b), the operator is marked in the heat paint to allow visual confirmation from the cab to the heating RoSo Nyutoki against the billet end upper surface. FIG.
In (b), the operator at the TV monitor operating chamber during the heating furnace extraction for the billet end face is marked with heat paint to allow visual confirmation.

FIG. 5 shows a flow of collating billet tracking data in the method of the present invention. Each time a billet is loaded and / or extracted, it is checked whether the billet is a billet to be marked. If the billet is a billet to be marked, an alarm is output from a computer terminal which performs billet tracking to notify the confirmation of the marking. The operator confirms whether there is a billet marking, and inputs the result to the computer terminal. In the computer , the input data is compared with billet tracking data to check whether the two match, and if they do not match, an alarm is output from the computer terminal to notify the operator of tracking consistency. Let them know you haven't.

[0037]

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

Walking beam type heating furnace, N in front
o. No. 1 strand rolling, No. 2 strand rolling and no. A three-strand rolling mill row composed of three strand rolling, and a multi-strand mill in which a single-strand rolling rolling mill row of one-strand rolling is arranged for three strands at the subsequent stage were prepared. During the three-pass rolling, rolling conditions of the same hole type and the same dimensions were used. 3
This through rolling mill train, the 12 aircraft mill group (Nanba1～N
o. Consist of 12 stand), one through the rolling mill train,
A group of 14 rolling mills (No. 13 to No. 26 stands)
It consisted of.

Further, three through mill through each one followed by column constituting the rolling mill train 2 intermediate rolling mill train (Nanba13～N
o. The rolling mill of 26 stands), a Saidorupa performing no tension rolling respectively, the two front and rear intermediate rolling mill following the column finishing mill were placed measuring dimensions machine performs dimensional measurement over the rolled material length. Further, on the exit side of the rolling mill which needs to twist the rolling mill row (coarse and one intermediate rolling mill row) of three continuous rolling, a twist guide capable of adjusting the angle for each strand is provided .
A rolling machine moves to rolling through one of the through rolling placed the large looper loop storage amount.

And, No. No. 1 strand and No.
Each of two intermediate rolling mill trains of two strands (No. 13 to No.
After 16 stands) , a finishing mill, a winder , and a Stellmore cooling facility were arranged. No. After two intermediate rolling mill rows (No. 13 to No. 16 stands) of three strands , a finishing rolling mill, a winder , and a new adjustment cooling facility were arranged.

Next , the operating conditions will be described.

No. No. 1 strand and No. Billet of low carbon steel rolled on two strands (cross-sectional dimension: 1
22 mm x 122 mm, length: 18,000 mm) unit weight: about 2 t) 2 Billet of special welding steel rolled on 3 strands (Cross section: 122 mm x 1
22mm, length: 18,000mm, unit weight: about 2t) 1
Book, was charged to alternately (periodically) Walking bi chromatography beam type heating furnaces, and three through extracted into predetermined respective strands of the rolling mill train for rolling.

[0043] Before loading to the walking beam type heating furnace, it was subjected to marking by heat paint on the end upper surface of the billet special welding steel. Then, the instrumentation Nyutoki and during the extraction of the heating furnace, the tracking information in the Konpita is transmitted from the cab to the computer by the operator to confirm the markings made on the billet visually, is performed tracking billet results In each case , it was confirmed that the actual billet and the tracking information were in agreement with each other to prevent the occurrence of different materials.

Thereafter, rolling was performed at a finish rolling speed of 51 m / sec, and 45 billets were rolled per hour.

[0045]

[Comparative Example] Using the multi-strand mill used in Example methods, as a comparative example according to the conventional method, No. No. 1 strand and No. Two billets of low carbon steel (6.5φ) rolled on two strands, One billet of special welding steel (5.5φ) rolled on three strands is alternately charged into a walking beam type heating furnace and extracted from the heating furnace at intervals of two billets,
And rolling at a finish rolling speed of 51 m / sec.
36 billets were rolled per hour.

[0046] Figure 6, the billet between the attributes (type of steel, finished product size) adjacent in a heating furnace in the case of the embodiment using heat-resistant paint of the present invention in order to recognize different, the attribute differs A different steel type is used as compared with the above conventional example in which the billet interval between adjacent billets is spaced by two billets.
The comparison of the rolling capacity at the time of different size simultaneous rolling is shown. The present invention how
The method shows that the rolling capacity is about 1.3 times higher in rolling capacity.

[0047]

According to the method of the present invention, in a multi-strand mill for wire rods, billets having different attributes (steel type, rolled size) are charged to a heating furnace alternately or periodically, and are sequentially extracted from the heating furnace. When simultaneous rolling of different steel types and different sizes is performed, tracking can be reliably performed , and generation of different materials can be prevented. As a result,
The simultaneous rolling of different sizes can be performed industrially, and the improvement of production capacity can be achieved.

[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 method of the present invention is applied.

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

3 is a diagram showing an example of the extraction method from loading and furnace to the heating furnace to which the present invention method is applied.

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

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

FIG. 6 shows the attributes of adjacent billets in a heating furnace (steel type,
To ensure that the finished product size) is different, the present invention how
Shows the case of using a heat-resistant paint by law, the comparison of the rolling capacity of the case where the attribute of the conventional method spaced billet two pins billets interval different adjacent billet between (rolled number per hour) It is.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Billet stand 2 Heating furnace 3 Coarse and 1 intermediate rolling mill row 4 2 Intermediate rolling mill row 5 Finish rolling mill 6 Winding machine 7 Stellmore cooling equipment 8 New adjustment cooling equipment 9 Bundling equipment 10 Bundling machine 11 Coil wholesaler

Continuation of the front page (56) References JP-A-56-17104 (JP, A) JP-A-52-109465 (JP, A) JP-A-50-43982 (JP, A) JP-A-51-126310 (JP, A) , A) Tokiko 53-7914 (JP, B2)

Claims (4)

(57) [Claims] 1. In a multi-strand mill of a rod wire in which a multi-strand rolling mill row is arranged in a first stage and a single-strength rolling mill row is arranged in a subsequent stage, multiple billets having different attributes (steel type, product size) are rolled. In the case where different steel types and different sizes are simultaneously rolled into the heating furnace alternately or periodically according to the order in which they are to be loaded, and the respective strands of the multi-thread rolling mill row are successively extracted from the heating furnace, alternately or periodically. Marking is performed on the end or end face of the billet of either attribute of the billet that is to be charged selectively, and the marking made on the billet at the time of charging into the heating furnace and / or extraction from the heating furnace is confirmed. The result is transmitted to the computer that performs the billet tracking and compared with the tracking information in the computer. Each time, the actual billet and the tracking information match. A method for preventing the generation of dissimilar materials in a heating furnace, characterized in that the generation of dissimilar materials is prevented by confirming that the conditions are satisfied. 2. During the multi-rolling, each billet of a different steel type is rolled under the same hole shape and the same size rolling conditions, and is rolled to a different product size for each strand after the rolling mill row where the single rolling is performed. The method for preventing generation of dissimilar materials in a heating furnace according to claim 1. 3. A side looper for performing tensionless rolling between rolling mills of an intermediate rolling mill group constituting each single rolling mill row following the multiple rolling mill, and a rolled material before and after the finish rolling mill. The method for preventing dissimilar material generation in a heating furnace according to claim 1 or 2, wherein a dimension measuring device for measuring dimensions over the entire length is arranged and rolling is performed to different product sizes. 4. A torsion guide capable of adjusting the angle of each strand on the output side of the rolling mill row of the multiple rolling mill, and a loop storage amount between the rolling mill rows which shifts from multiple rolling to single rolling. The rolling is performed by arranging a looper having a large diameter.
4. The method for preventing generation of dissimilar materials in a heating furnace according to any one of items 3 to 3.