JPH0647202B2 - 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) Conventionally, when a strip material such as a strip steel taken out from a rolling mill by rolling a billet is cut into desired dimensions such as order dimensions to obtain products having the same dimensions, first, A method in which the strip material taken out from the product is once cut into an intermediate product having a length commensurate with the length of the cooling bed and having a dimension which is a multiple of the product dimension, and then the intermediate product is cut into the above product dimension. Have been proposed (for example, Japanese Patent Publication No. 56-2008).
3 gazette).

(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 products having the same size are obtained from each of the intermediate products. A plurality of the above-mentioned first products and a semi-product having one of the stepwise dimensions that change at equal pitch dimensions, and the residual after obtaining the intermediate product from the above-mentioned strip material as much as possible. Until the quantity is such that only one second product having any one of the dimensions selected and set from the stepwise dimensions in which the quantity changes in the pitch dimension can be taken,
The remaining size is calculated by repeatedly adding or subtracting the value of the product of the pitch size and the number of intermediate products to the remaining size to calculate the remaining size. This is to calculate the size of the semi-finished product by repeating subtraction or addition at the pitch size step, and to calculate the size of the intermediate product based on the calculated size of the remaining amount.

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 first product C, the second product C'quasi product D, and the crop E obtained by cutting this are shown. Here, the above-mentioned semi-product D and product C'are distinguished from the product C molded according to the immediate demand, but they should be products according to future demand, and in terms of quality, the product C Is equivalent to

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 '
The semi-finished product D is molded. The remaining material in this case is the crop E.

Further, a small bundling line 6 for laterally moving the products C, C ′ and the semi-finished product D 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 products C, C ′ and a plurality of semi-finished products D, respectively. 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-finished product line 13 that conveys the small bundled semi-finished products D is provided, and a semi-finished product accumulation table 14 that stacks these bundled semi-finished products D 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. Also, in FIG. ₂ , L ₂ ,
Reference numerals l, l ₁ and l ₂ denote the respective sizes of the intermediate product B, the product C and the semi-product D and the product l ′ of the product C ′ and the size of the crop E added.

The dimensions l and l'of the products C and C'and the dimension l _{1 of the} semi-product D
Is selected from a predetermined stepwise dimension, and this stepwise dimension is assumed to change with an equal pitch P, for example, P = 0.5 m, and the range from 3 m to 12 m, Specifically, it will be 3m, 3.5m, 4m ... 11.5m, 12m.

Next, referring to FIG. 3 and FIG.
A method for cutting the product to obtain the products C, C ′ and the semi-product D will be described. These drawings show flowcharts for carrying out the present invention, and (S1) to (S26) 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 product C.

In addition, the total length L ₀ and the maximum length L that can be carried into the cooling floor 2
The temporary division number d of the intermediate product B is calculated from max (S
2). In this case, the number of decimals of the provisional number of divisions d is rounded up to an integer d '(for example, if d = 10.3, d' = 11), and cut by the dividing shear 1 by this d '. The temporary dimension L ₁ of the intermediate product B to be processed is calculated (S3).

Next, the provisional number n of the product C obtained from the intermediate product B having the provisional dimension L ₁ is calculated (S4). In this case, the number of decimal points below this temporary number n is rounded down to an integer n '(for example, if n = 7.5, then n' = 7.0). dimensions _{l 1} is calculated in (S5).

Then, according to the values of d ′ and l ₁ , the total length L ₀ of the strip A is
Then, the size l ₂ of the remaining amount after the intermediate product B is obtained as much as possible is calculated (S6).

Next, in steps (S7) to (S23), the above l
_The size of the semi-finished product D is set to any one of the stepwise sizes so that ₂ has a size capable of accepting only one product C '.

Here, the value of l ₂ is such that only one product C ′ can be adopted, because when an error occurs in the total length L ₀ of the strip A due to insufficient rolling or the like, l ₂ as described above is used. This is because the value of is convenient for absorbing this error.

First, in step (S7), the remaining size l ₂ is lma.
If it is determined that the value is smaller than x, that is, lma
If x> l ₂ is determined, steps (S8) and (S9) are executed as described later, and step (S1)
0) is reached.

The lmax is one of the predetermined dimensions l ′ selected and set from the predetermined stepwise dimensions.
Is the maximum dimension that allows only one product C'having the following to be taken, that is, this lmax is smaller than 2l 'but is as close as possible to this 2l'.

On the other hand, in the same step (S7), the value of l ₂ is lmax.
If it is determined that the value is larger than, that is, lmax <
If l _2, step as will be described later (S11) ~
Steps (S16), (S8) and (S9) are executed and step (S10) is reached.

If it is determined in step (S17) that the value of l ₂ is larger than the minimum dimension l min (a value that is infinitely close to l ') that can take only one product C ′, that is,
If lmin <l ₂ , steps (S9) and (S10)
Is executed.

On the other hand, in the same step (S17), the value of l ₂ is the above lmin.
If it is determined that the value is smaller than, that is, lmin>
If l _2, in steps shown in FIG. 4 (S18) ~ (S23) and (S9) is executed as described later it reaches step (S10).

The case where lmax> l ₂ is determined in step (S7) and lmin <l ₂ is determined in step (S17) will be described. In this case, l ₂ is set to the desired value as described above. Since it is a value, the dimension L ₂ of the intermediate product B is calculated based on this l ₂ (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 ₂ in the same step (S7) will be described. Since l ₂ in this case is too larger than the desired value, this l ₂ is shortened to the desired value. The dimension l _{1 of the} semi-finished product D is lengthened by the shortened amount.

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 the value becomes ₂ . Further, at this time, the pitch P dimension used for the subtraction to obtain the desired l ₂ is determined by the steps (S14) to (S
In 16), it is added to the dimension l ₁ of the semi-finished product D. And
Dimension _{L 2} of the intermediate product B is calculated by the _{l 2} (S1
0).

On the other hand, if it is determined that lmin> _{l 2} in ibid step (S17) includes a Therefore _{l 2} are those crosses smaller than the desired value has been described above step (S11) ~ (S16) On the contrary, steps (S18) to (S20)
Then, the addition 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 lmin <l ₂ . Further, at this time, the pitch P dimension used for the addition to obtain the desired l ₂ is the step (S
21) to (S23), the size l ₁ of the semi-finished product is subtracted. The dimension _{L 2} of the intermediate product B is calculated by the _{l 2} (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 actuated to cut the strip A, form the intermediate product B, and the dimension l of the product C and the dimension l of the semi-product D.
₁ and the value of the dimension l'of the product C ', the cold shear 4 is actuated, thereby forming the intermediate product B, the products C, C'and the semi-product D from the strip A (S2).
6). Further, the remaining amount after molding the intermediate product B, the products C, C ′ and the semi-product D is processed as a 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,
From each of these intermediate products, a plurality of the above-mentioned first products having the same size and a semi-product having one of the stepwise sizes that change at equal pitch dimensions are obtained. To the extent that the remaining amount after obtaining as much as possible becomes a dimension in which only one second product having any one of the dimensions selected and set from the above-mentioned pitch dimensions can be taken , The remaining size is calculated by repeating addition or subtraction in increments of the product of the pitch size and the number of intermediate products, and the remaining size is calculated accordingly. Calculate the size of this semi-finished product by repeating subtraction or addition at the above pitch size steps, and
Since the size of the intermediate product is calculated based on the size of the remaining amount calculated above, the crop can be made as short as possible by selecting the size of the semi-product in the intermediate product, thus improving the yield. To be achieved. 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 in that the work for obtaining 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: bar material, B: intermediate product, C: product (first product),
C '... Product (second product), D ... Semi-product, E ... Crop.

Claims (1)

[Claims] 1. A plurality of intermediate products of the same size are obtained from a strip material taken out by rolling a billet, and when a plurality of first products of the same size are obtained from the respective intermediate products, the respective intermediate products are obtained. To obtain a plurality of the above first products and a semi-finished product having one of the stepwise dimensions that change in a uniform pitch dimension, and to obtain the intermediate product from the above-mentioned strip material as much as possible. With respect to the remaining amount, until the amount is such that only one second product having any one of the sizes selected and set from the stepwise changes in the pitch size can be taken. , The value of the product of the pitch dimension and the number of intermediate products is incremented or decremented repeatedly to calculate the dimension of the remaining amount, while the semi-finished product is subtracted or added in the increment of the pitch dimension in accordance with this. Repeat this process Dimension calculating a, and a method of cutting rolled strip material, characterized in that for calculating the dimensions of the intermediate product, based on the size of the computed remaining amount.