JPH0647203B2 - 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 is 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 size that is a multiple of the desired product size, and then this intermediate product is cut into the product size described above. (For example, Japanese Patent Publication No. Sho 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 numerical value of an integer multiple of the above-mentioned pitch dimension was revised, the dimension of the intermediate product was calculated again by this integer multiple, and then the remaining product after obtaining the main product of the desired dimension from the intermediate product as much as possible was obtained. When the amount is more than the minimum selectable value of other products, this remaining amount is regarded as another product, and when the remaining amount is less than the minimum selectable value of other products,
The other product is obtained from the total size of the remaining amount and one main product.

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,
Intermediate product B obtained by cutting this, main product (hereinafter, simply referred to as main product) C, other products, first and second semi-finished products D ₁ and D ₂ and crop E, and other products C'is shown. Here, the above semi-product D ₁ ,
Although D ₂ and products C 'is distinguished from the main product C to be shaped in accordance with the immediate demand, is intended to become the product in accordance with future demand, the main product C and equivalent to qualitatively Is.

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, and 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, and the main product C, the semi-finished products D ₁ and D ₂ , and the other products C ′ are molded. The remaining material in this case is the crop E.

Further, a small bundling line 6 for laterally moving the main product C, the semi-products D ₁ , D ₂ and the other products C ′ is provided at the subsequent stage of the cold shear 4. The small bundling line 6 is provided with a plurality of small bundling machines 7 for bundling a plurality of main products C, a plurality of semi-finished products D ₁ and D ₂ , and another product C ′. Further, a product line 8 that conveys the small-bundled main products C is provided, and a large binding machine 9 that binds a plurality of the main products C is provided. Further, a large bundling line 10 that conveys these large bundled main products C is provided,
Product accumulation table 11 for accumulating the main products C that are bundled together
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. Although not shown, other products C'are also accumulated on the accumulation table in the same manner as above.

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 , l ₀ , S ₁ , S ₂ and l are the intermediate product B, the main product C, the first semi-finished product D ₁ and the second semi-finished product D ₂ , and other products C ′. The size of the crop E plus the size of the crop E is shown, that is, the remaining amount after the intermediate product B is obtained from the strip A as much as possible is shown. In this embodiment, the other product C'has the same shape and length as the main product C.

The dimensions l ₀ of the products C and C ′ and the dimensions S ₁ and S ₂ of the semi-finished products D ₁ and D ₂ are selected from predetermined stepwise dimensions, and the stepwise dimensions are equal pitches. It is assumed that it changes with P. For example, when P = 0.5 m, each product C, C ′,
The minimum length of D ₁ and D ₂ is Lmin = 3m, and the maximum length is Lmax = 12m
And more specifically 3m, 3.5m, 4m ... 11.5m,
It has a stepwise size of 12m.

Next, with reference to FIG. 3 to FIG. 5, a method for cutting the strip A by the above equipment to obtain the main products C, the semi-products D ₁ , D ₂ and other products C ′ will be described. . These drawings show flowcharts for carrying out the present invention, and (S1) to (S39) in the drawings show respective steps.

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 main 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, this N is rounded down to the nearest whole number to be an integer multiple N '(for example,
If N = 7.5, then 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 final value of N'is calculated so that the above l has such a size that only one product C'can be taken, and the final value is calculated by this N '. The dimension L ₂ of the intermediate product B is calculated.

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. In this embodiment, the value of l is set so that only one of the products C ′ having the same length as the main product C can be adopted as described above. However, the value of l is quasi products D ₁ , D. only one of the _two may be a possible value.

Hereinafter, a product C ′ cut from the above-mentioned one having a length of 1 will be referred to as a main product C ′.

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 lmax is any one of the dimensions l ₀ selected and set from the predetermined stepwise dimensions.
The product C 'having a maximum dimension which is adapted can take only one, that is, the lmax is smaller than 2l _0, a value close as possible to the 2l _0.

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 larger than the minimum dimension lmin (a value larger than l ₀ but a value that is infinitely close to l ₀ ) that can take only one main product C ′. If it is judged to be a 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, steps (S18) to (S2) will be described later.
3) 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, although not shown, after the temperature of L ₂ calculated in the step (S10) is corrected, the time for cutting the intermediate product B is calculated by the rolling speed, and the dividing shear 1 is operated by this time. And cut the strip A,
The intermediate product B is molded.

On the other hand, in steps (S24) to (S39), from the respective intermediate products B, from the remaining amount (temporary semi-product size S ₀ ) after obtaining the main product C having the desired size l ₀ as much as possible, or An operation for obtaining at least one other semi-finished product D ₁ , D ₂ from the total size (S ₀ + l ₀ ) of the remaining amount and at least one main product C is executed. This will be described below.

First, in step (S24), a temporary cutting number n ₀ for cutting the intermediate product B in the cold shear 4 is calculated from the values of L ₂ and l ₀ . Then, the n ₀ is a n _{0 'is} written down following the decimal point.

Then, the provisional quasi-product size S is calculated by L ₂ , l ₀ and n ₀ ′
₀ is calculated (S25).

If it is determined in step (S26) that S ₀ is 0, the intermediate product B is divided so that only the main product C is obtained in step (S27), and the number of cuts n ₀ ′ is cut.
Is cut by.

If it is determined that S ₀ = 0 is not true in step (S26), then step (S28) is executed.
0 <S ₀ <Lmin (each product C, D ₁ , D as described above
₂ ), the step (S29) is further executed, where Lmin ≦ S
If it is determined that ₀ ≦ Lmax (the maximum value that can be selected for each of the products C, D ₁ and D ₂ as described above), the step (S
30), S ₁ = S ₀ and S ₂ = 0. That is, the intermediate product B is divided so as to obtain a plurality of main products C and one first semi-finished product D ₁ having a size S ₀ , and is cut at the number of cutting times n ₀ ′.

If 0 <S ₀ <Lmin is determined in step (S28), step (S31) is executed, and if l ₀ + S ₀ ≤Lmax is determined, step (S32). Then, S ₁ = l ₀ + S ₀ , S ₂ = 0.
That is, the intermediate product B has a plurality of main products C and a size of l ₀ + S _0.
Is divided so as to obtain _one first semi-finished product D _{1 of}
The cutting is performed at the number of cutting times n ₀ ′ −1.

If it is determined in the step (S31) that l ₀ + S ₀ ≤Lmax is not satisfied, step (S33) is executed, and if it is determined that l ₀ + S ₀ > Lmax is satisfied,
Further, step (S34) is executed.

If it is determined in this step (S34) that l ₀ + S ₀ is an even multiple of the pitch P, a step (S35)
After that, in step (S36), S ₁ = (l ₀ + S ₀ ).
/ 2, S ₂ = S ₁ . That is, the intermediate product B is divided so as to obtain a plurality of main products C and one first semi-finished product D ₁ and second semi-finished product D ₂ each having a size of (l ₀ + S ₀ ) / 2, The cutting is performed at the number of cutting times n ₀ ′ −1.

In the step (S34), l ₀ + S ₀ is the pitch P
If it is determined that it is not an even multiple of step (S3
7), (S38) and (S39) are executed, and S ₁ =
(L ₀ + S ₀ −P) / 2, S ₂ = S ₁ + P. That is, the intermediate product B has a plurality of main products C and a size of (l ₀ + S ₀
-P) / 2 1st semi-finished product D ₁ and size S ₁ + P
To obtain one second semi-finished product D _{2 of}
The cutting is performed at the number of cutting times n ₀ ′ −1.

In the above case, the remaining amount after the intermediate product B, the main product C, the semi-finished products D ₁ and D ₂ , and the other products C ′ are molded from the strip A is treated as the 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 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 numerical value of an integer multiple of the above-mentioned pitch dimension was revised, the dimension of the intermediate product was calculated again by this integer multiple, and then the remaining product after obtaining the main product of the desired dimension from the intermediate product as much as possible was obtained. The quantity is the maximum that other products can choose When the remaining amount is more than the value, the remaining amount is set as another product. When the remaining amount is less than the minimum selectable value of other products, the remaining size and the one main product are combined to determine the other size. In order to obtain the product of, the size of the intermediate product is lengthened as much as possible based on the product size selected from the predetermined stepwise size, whereby more various size products can be obtained, Moreover, since more products are obtained in this way, the crop can be shortened by that amount, so that the yield can be improved. Moreover, since only one product is obtained from the remaining amount after the intermediate product is obtained from the above-mentioned strip material, the counting work of the product obtained from this remaining amount is unnecessary. Therefore, there is an advantage that the management of the product becomes easier accordingly.

In addition, other products are obtained from the remaining amount after obtaining the main product of the desired size as much as possible from the intermediate product, or from the total size of this remaining amount and one main product. From each intermediate product, the desired main product and other products can be reasonably obtained without any cropping.

[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 to 5 are flowcharts. A ...... elongated member, B ...... intermediate product, C ...... main products (mainly _{products), D 1,} D ₂ ...... quasi products (other products), C '...... other 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 , Revise the numerical value of integer multiple of the pitch dimension that has determined the size of the intermediate product, calculate the intermediate product size again by this integer multiple, and then obtain the main product of the desired size from the intermediate product as much as possible. When the remaining amount after is over the minimum selectable value of other products, this remaining amount is set as another product, and when the above remaining amount is less than the minimum selectable value for other products, the above remaining amount, A method for cutting a rolled strip, characterized in that another product is obtained from a product having a total size of one of the main products.