JPH0647201B2 - Method for cutting rolled strip - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for cutting a rolled strip for improving the yield.

(Prior Art) When a strip material such as a strip steel conventionally taken out from a rolling mill by rolling a billet is cut into a desired dimension such as an order dimension to obtain a product, first, a strip taken out from the rolling mill is used. A method has been proposed in which the material is once cut into an intermediate product having a length commensurate with the length of the cooling bed and having a dimension multiple times the product dimension, and then the intermediate product is cut into the above product dimension. (For example, Japanese Patent Publication No. 56-20083).

(Problems to be Solved by the Invention) By the way, when an intermediate product is cut as much as possible from a strip material rolled as described above, a residual material is usually produced.
All this residual material is processed as a crop. However, if the residual material is not controlled in this way, the yield will be reduced.

When residual material is produced after obtaining the intermediate product as described above, in order to improve the yield, it is necessary to cut the residual material again to obtain the product from this residual material as much as possible. Can be considered.

However, at the stage of obtaining the intermediate product, it is not expected what size of the residual material will occur after this, so, for example, if the residual material is less than the size of the intermediate product, When it is close, a counting operation for cutting the residual material into a plurality of products again is required, and thus the work for obtaining the products becomes complicated.

(Object of the Invention) The present invention has been made by paying attention to the above circumstances, when cutting a rolled strip to obtain a product, the crop loss is reduced to improve the yield, and Even when the yield is improved as described above, it is an object to facilitate the work for obtaining the product.

(Structure of the Invention) A feature of the present invention for achieving the above-mentioned object is that a plurality of intermediate products having the same size are obtained from a strip material taken out by rolling a billet, and the intermediate product is preliminarily changed at an equal pitch. When trying to obtain a plurality of products selected from the determined stepwise size from each of the intermediate products, each intermediate product is a certain integer multiple of the pitch dimension,
Only one product having any one dimension selected and set from the stepwise dimensions in which the remaining amount after obtaining intermediate products as much as possible from the entire length of the above-mentioned strip material changes with the above pitch dimension Until the size that can be obtained is repeated, addition or subtraction is repeated for the above-mentioned amount of the remaining amount in increments of the product of the above pitch dimension and the number of intermediate products. On the other hand, depending on the multiple of this repetition, the intermediate product The point is to revise the numerical value that is an integer multiple of the above-mentioned pitch dimension, and calculate the dimension of the intermediate product again by this integer multiple.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 shows an outline of equipment for carrying out the present invention, and FIG. 2 shows a strip A taken out by billet rolling,
The intermediate product B, the products C and C ′, the first semi-finished product D ₁ , the second semi-finished product D ₂ and the crop E obtained by cutting this are shown. Here, the above semi-finished products D ₁ and D ₂ are distinguished from the products C and C ′ that are molded according to the current demand, but they should be products according to future demand, and in terms of quality. Are equivalent to the products C and C '.

In the figure, reference numeral 1 is a dividing shear, and this dividing shear 1 is for cutting a strip material A such as strip steel taken out by rolling of a billet into a plurality of intermediate products B having the same size. Further, 2 is a cooling bed, and this cooling bed 2 cools the intermediate product B while moving it laterally. Three
Is a feed line, a cold shear 4 is provided in front of the feed line 3 in the feeding direction, and the intermediate product B sent through the feed line 3 is the cold shear 4
Is cut into a predetermined size with the product C, C '
And the semi-finished products D ₁ and D ₂ are molded. The remaining material in this case is the crop E.

Further, a small bundling line 6 for laterally moving the products C and C ′ and the semi-finished products D ₁ and D ₂ is provided after the cold shear 4. The small binding line 6 is provided with a plurality of small binding machines 7 and a plurality of products C, C ′, a plurality of semi-finished products D ₁ ,
The D _2's are each tightly bound together. Further, a product line 8 for conveying the small-bundle products C and C'is provided, and a large binding machine 9 for binding a plurality of these products is provided. Further, a large bundling line 10 that conveys these large-bundled products C and C'is provided, and a product accumulation table 11 that accumulates the large-bundled products C and C'is provided.

Further, a semi-product line 13 for transporting the individually small-bundled semi-finished products D ₁ and D ₂ is provided, and a semi-finished product accumulating table 14 for accumulating the bundled semi-finished products D ₁ and D ₂ is provided. It is provided.

On the other hand, a random scale line 15 that conveys the crop E formed by cutting the cold shear 4 is provided, and a random scale 16 that cuts the crop E to a predetermined size is provided. 18 is a random scale counting table, 19 is a random scale small binding machine, 2
0 is a random scale accumulation table. Further, in FIG. 2, L ₂ indicates the intermediate product B, and 1 indicates the product C ′ plus the size of the crop E.

The dimensions of the products C and C ′ and the semi-products D ₁ and D ₂ are selected from predetermined stepwise dimensions, and the stepwise dimensions are assumed to change at an equal pitch P. , P = 0.5 m, the minimum length of each product C, C ′, D ₁ , D ₂ is Lmin = 3 m, and the maximum length is Lmax = 12 m. More specifically, 3 m, 3.5 m, 4 m ...・ The size will be 11.5m and 12m.

Next, referring to FIG. 3 and FIG.
A method for cutting the product to obtain the products C and C ′ and the semi-products D ₁ and D ₂ will be described. These figures show flow charts for carrying out the present invention, in which (S1) to (S2
6) shows each step.

First, in step (S1), the total length L ₀ of the strip A is calculated from the billet weight W, the scale loss weight W ₁ , the crop loss weight W ₂ in the rolling line, and the unit weight w of the product C.

In addition, the total length L ₀ and the maximum length C that can be carried into the cooling floor 2
A temporary division number D of the intermediate product B is calculated from Lmax (S
2). In this case, the decimal point of the provisional number of divisions D is rounded up to an integer D '(for example, if D = 10.3, then D' = 11). The temporary dimension L ₁ of the intermediate product B to be cut is calculated (S3).

Next, it is calculated how many times the length of the intermediate product B having the provisional dimension L ₁ is the pitch P dimension, and the multiple is indicated by N (S4). Then, the decimal point of N or less is rounded down to be an integer multiple N '(for example, N =
If 7.5, N '= 7.0) (S5).

Then, by the values of P, D ′, L ₁ ′ and N ′,
The dimension l of the remaining amount after the intermediate product B having the provisional dimension L ₁ is obtained as much as possible from the total length L ₀ of the strip A is calculated (S
6).

Next, in steps (S7) to (S23), the above l
Is calculated such that only one product C ′ can be taken, and the final size L _{2 of the} intermediate product B is calculated by this N ′.

Here, the value of l is set so that only one product C ′ can be adopted. The value of l is as described above when an error occurs in the total length L ₀ of the strip A due to insufficient rolling or the like. Is convenient for absorbing this error.

First, in step (S7), the size l of the remaining amount is lmax.
If it is determined that the value is smaller than, that is, lmax
If it is determined that> l, steps (S8) and (S9) are executed as described later, and step (S10)
Reach

The above lmax is the maximum dimension that allows only one product C ′ having any one of the dimensions selected and set from the predetermined stepwise dimensions, that is, , Lmax is smaller than twice the length of the product C ′, but is a value that is extremely close to the double length of the product C ′.

On the other hand, if it is judged in the step (S7) above that the value of l is larger than lmax, that is, lmax <l
If so, steps (S11) to (S1) will be described later.
6), (S8) and (S9) are executed to reach step (S10).

Further, in step (S17), the value of l is the minimum dimension lmin (a value larger than the length of the product C'that can take only one product C ', but is not limited to the length of the product C'. If it is judged to be a value larger than (close value), that is,
If lmin <l, steps (S9) and (S10) are executed.

On the other hand, if it is judged in the step (S17) that the value of l is smaller than the above lmin, that is, lmin> l
If so, as will be described later, the step (S1
8) to (S23) and (S9) are executed to reach step (S10).

The case where lmax> l is determined in the step (S7) and lmin <l is determined in the step (S17) will be described. In this case, l is the desired value as described above. Therefore, the step (S
The dimension L ₂ of the intermediate product B is calculated based on N'calculated in 5) (S10). That is, the provisional dimension L ₁ of the intermediate product B shown in the step (S3) is replaced by the dimension L ₂ of the intermediate product B here.

On the other hand, the case where it is determined that lmax <l in the same step (S7) will be described. Since l in this case is larger than the desired value, this l is shortened to the desired value.

That is, in steps (S11) to (S13), lmax> l
The subtraction is repeated in increments (P × D ′) of the product of the pitch P dimension and the division number D ′, which is the number of intermediate products B, until Further, at this time, the size of the intermediate product B is increased by a multiple of the above repetition of the pitch P size used for the subtraction to obtain the desired l. The multiple (1 in the illustrated example) is added to the integer multiple N ′ in steps (S14) to (S16). Then, the dimension L ₂ of the intermediate product B is calculated from N ′ thus obtained and the above l (S10).

On the other hand, when it is determined that lmin> l in the same step (S17), this l is smaller than the desired value. Therefore, the reverse of the above description of steps (S11) to (S16). In steps (S18) to (S20),
The addition is repeated in increments (P * D ') of the product of the pitch P dimension and the number of divisions D'which is the number of intermediate products B until lmin <l'. Further, at this time, the dimension of the intermediate product B is reduced by the multiple of the repetition of the dimension of the pitch P used for the addition to obtain the desired l, and thus the multiple of the pitch P reduced in the intermediate product B at this time. (1 in the example)
Is subtracted from the integer multiple N ′ in steps (S21) to (S23). Then, the dimension L ₂ of the intermediate product B is calculated from N ′ thus obtained and the above l (S10).

Then, the calculated L ₂ as described above is that it is temperature corrected L ₄ (S24), also by the L ₄ and the rolling velocity v, the time to be cut the intermediate product B T is calculated (S2
5). Then, at this time T, the dividing shear 1 is operated to cut the strip A and form the intermediate product B. In addition, the intermediate product is cut by the operation of the cold shear 4 which receives a separate cutting command, and the products C and the semi-products D ₁ and D _{2 which} are integral multiples of the pitch P are molded (S26). Also,
These intermediate products B, products C and C'and semi-products D ₁ and D ₂
The remaining amount after molding is processed as crop E.

(Effect of the Invention) According to the present invention, while obtaining a plurality of intermediate products having the same size from the strip material taken out by rolling the billet,
When trying to obtain a plurality of products selected from predetermined stepwise dimensions so as to change at equal pitches from each of the intermediate products, each of the intermediate products has an integral multiple of the pitch dimension, Only one product having any one dimension selected and set from the stepwise dimensions in which the remaining amount after obtaining intermediate products as much as possible from the entire length of the above-mentioned strip material changes with the above pitch dimension Until a value that can be taken is obtained, addition or subtraction is repeated with respect to the remaining amount size in increments of the product of the pitch size and the number of intermediate products. On the other hand, depending on the multiple of this repetition, the intermediate product The numerical value of an integer multiple of the above-mentioned pitch dimension that has been set has been revised, and the size of the intermediate product is calculated again by this integer multiple, so the intermediate product is selected as much as possible based on the product size selected from the predetermined stepwise dimensions. The dimensions of By Kusuru, it can shorten the crop, thus improving the yield can be achieved. Moreover, the product obtained from the remaining amount after obtaining the intermediate product from the above-mentioned strip is 1
Since there are only books, it is not necessary to count the products obtained from the remaining amount. Therefore, there is an advantage that the management of the product becomes easier accordingly.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a schematic view of equipment for cutting a rolled strip, FIG. 2 is a cutting state diagram of the strip, and FIGS. 3 and 4 are flow charts. A ... Strip material, B ... Intermediate product, C, C '... Product, D ₁ ,
D ₂ ...... quasi-products, E ...... crop.

Claims (1)

[Claims] 1. A plurality of intermediate products of the same size are obtained from a strip material obtained by rolling a billet, and a plurality of products selected from stepwise sizes which are predetermined so as to change at an equal pitch. When obtaining from each intermediate product, each intermediate product should be an integer multiple of the above pitch dimension, and the remaining amount after obtaining the intermediate product as much as possible from the entire length of the above-mentioned strip changes with the above pitch dimension. Has one of the dimensions selected from the stepwise dimensions to be set 1
Addition or subtraction is repeated in increments of the product of the pitch dimension and the number of intermediate products to the dimension of the above remaining quantity until the size that can take only products of books, while depending on the multiple of this repetition A method for cutting a rolled strip, characterized in that a numerical value of an integer multiple of the pitch dimension, which determines the dimension of the intermediate product, is revised, and the dimension of the intermediate product is computed again by the integer multiple.