JP2932926B2 - Quality control method for plate or strip products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a base material by a plurality of steps
Quality control of plate-shaped or strip-shaped products based on the position information of the base material, semi-finished products, and longitudinal parts of the final products in the process of passing through one or more semi-finished products with different weight per unit length or cross-sectional area On how to do.

[0002]

2. Description of the Related Art In a manufacturing process of a steel sheet, a slab as a base material is repeatedly subjected to hot and / or cold rolling to obtain a coil as a final product. In order to obtain a final product that satisfies the target dimensions and has a good yield when producing a finished product, it is necessary to control the dimensions of the base material, each semi-finished product, and the final product, such as the width and thickness of each finished product, as well as the degree of influence between each other. Analysis is also an extremely important management item.
Therefore, of course the mother material in the manufacturing process of the conventional hot-rolled steel plate or the like, semi-finished products for each production step, further quality control information about the longitudinal each part of the final finished product is collected and analyzed have been made based on this.

FIG. 6 (a) shows a base material M to be rolled and a base material M
FIG. 6B is an explanatory diagram showing a relationship between a semi-finished product X obtained by rolling the semi-finished product X and a semi-finished product Y obtained by rolling the semi-finished product X. FIG. A case is shown in which a semi-finished product X is obtained by rolling the base material M in step a, and a semi-finished product Y is obtained by rolling the semi-finished product X in step b. Base material M, semi-finished products X and Y have lengths L ₀ and L respectively.
₁ , L ₂ , and the weight ratio (when the base material, semi-finished product X, and final finished product Y each involve a change in material) are W ₀ , W ₁ , and W ₂ , respectively.
The cross-sectional area ratio may be used instead of the weight ratio.

The dimension q of the tip of the base material M₀At the rear end
Dimension r₀Each corresponding area is a semi-finished product X.
Dimension q₁, Dimension r₁And for semi-finished products Y
Modulo q _TwoDimension r_TwoArea. For example, semi-finished product X
Q₁Is q on the base material M₀Equivalent to
Then, the following relationship is established between them. q₀= Q₁・ W₁/ W₀………… (1)

[0005] However, in addition to rolling the base material M as it is to the semi-finished product X and further to the semi-finished product Y, the quality is ensured. Excision of the ends has been performed. FIG. 7 (a) shows the semi-finished products X and Y for each process,
FIG. 7 (b) is an explanatory view of cutting off the off-gauge portion at the rear end, and FIG. 7 (b) is an explanatory view of the process. First, in step a, the base material M is rolled to obtain a semi-finished product X '. The semi-finished product X is obtained by cutting, and then the semi-finished product X is rolled in the step b to obtain a semi-finished product Y ', and then both ends of the semi-finished product Y' are cut off to obtain a semi-finished product Y. .

However, when such semi-finished products X 'and Y' are cut off at both ends,
Analysis of mutual influence is difficult, and quality control information is limited to data collection and analysis within each process unit, and there is no quality control method based on data analysis over a plurality of processes. The present invention has been made in view of the above circumstances, and its purpose is to cut a front end, a rear end, and / or an intermediate portion of a semi-finished product, and to process a base material, a semi-finished product, and a final product between processes. It is an object of the present invention to provide a quality control method for a plate-shaped or strip-shaped product that can easily control the degree of mutual influence on the longitudinal direction.

[0007]

Plate or quality control method of the strip-like formed article according to the present invention, in order to solve the problems] from the base material forming the plate-shaped or strip-shaped
A method for quality control of a plate or strip- like product in a process of forming a plate or strip- like final product through one or more semi-finished products whose front end or rear end is cut off during a plurality of rolling processes. ,
Cutting a semi-finished product from which the length, front or rear end has been cut off
Cutting length and weight per unit length of base material, semi-finished product and final product
Or, calculate the cross-sectional area , convert the cut length of each semi-finished product into the length on the base material, and calculate the positions of the front and rear ends of each semi-finished product on the base material.
And a step of obtaining the position .

[0008]

According to the present invention, even if the front end and / or the rear end and / or the intermediate part is cut and removed in the process of passing through a semi-finished product, it is possible to accurately grasp the degree of the accompanying effect. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a schematic diagram of an apparatus for carrying out a quality control method according to the present invention. In FIG. 1, 1 is a main body of the quality control apparatus, 2 is a temperature provided in equipment of an i-th step,
A measuring instrument group including sensors such as a board width, a load, etc., 3 is a measuring instrument group including sensors for temperature, board width, load, etc. provided in the equipment of the (i + 1) th step, and 4 is an external storage device. After rolling the semi-finished product obtained by cutting off the leading end and / or the rear end of the semi-finished product obtained in the i-1 step (not shown) in the i-th step, the leading end and / or the rear end are cut off again to obtain another semi-finished product. After obtaining the semi-finished product I and rolling it in the i + 1 step, the leading end and / or the rear end are cut off to obtain a semi-finished product I + 1, and the same is repeated in the same manner to obtain a final finished product.

[0010] Measuring instrument groups 2, 3 for each i, i + 1 process
, The longitudinal temperature at each position (positions 1-1000), the plate width,
Detecting a sheet thickness, you output to supervisory control apparatus main body 1. The management device body 1 calculates the product length, product width, weight per unit length , cutting length at the front end and rear end, and cutting area in each process based on the input data for each process, and calculates these. Based on the data, the weight ratio and cross-sectional area ratio of the base material, each semi-finished product, and the final product are calculated, and based on these weight ratios and cross-sectional area ratios, the cutting lengths at the front end, rear end, and middle of each semi-finished product are determined. The data is converted into a reference length on the base material M, and the converted data is stored and stored in the storage device 4 together with the file name in a manner as shown in FIG. 2, for example.

Thus, the position of the semi-finished product I from the front end is
Length from the tip on the base material M corresponding to the fixed length position
The position of the material, ie the longitudinal direction between the base material M and the semi-finished product I
Can be compared and compared. So is the base material M
During many rolling processes from final product to final producttip
Even if the part, rear end and / or middle part is partially resected,
The base material, semi-finished products, and final products
Can be compared with each other in the longitudinal direction.

Further, by using the base material M as a reference, it is also possible to collate a predetermined position from the front end of the semi-finished product I with a predetermined position from the front end of the semi-finished product J, for example, between the respective semi-finished products. Becomes Thus, the quality control information for the semi-finished product can be compared between the processes.

FIG. 3 is a flow chart showing the processing steps. First, data is collected from the instrument and instrument groups 2 and 3 provided with equipment for each step (S1), and the plate length, the width end of the semi-finished product,
After obtaining the length of the cut portion of each rear end portion, the length is converted into the length of the base material M (S2), and a data file as shown in FIG. 2 is created (S3).
Alternatively, after processing, the data is stored in the storage device 4 together with the file name in a manner as shown in FIG. 2 to accumulate data (S4).

Next, a specific description will be given of a method of obtaining a base material converted length for creating a data file as shown in FIG. FIG. 4 (a) is an explanatory view showing respective longitudinal dimensions from a base material to a final product through a plurality of semi-finished products having different weight ratios or cross-sectional area ratios in a steel sheet manufacturing process, and FIG. It is process explanatory drawing which shows the process process with respect to a base material and a semi-finished product, and M shows a base material, A, B, ... I, J shows a semi-finished product, and N shows a final product. The length of the base material M is L ₀ ,
The weight ratio is W ₀ , and the lengths of semi-finished products A, B,.
₁ , L ₂ , L _i , L _j , and weight ratios W ₁ , W ₂ , W _i , W
_j , the length of the final product N is L _n , and the weight ratio is W _n . After the first rolling of the base material M, the leading end and the trailing end are t ₁ and b, respectively.
_After cutting the semi-finished product A _{one by} one and rolling the semi-finished product A, the leading end and the rear end are cut off by t ₂ and b _{2 respectively} to obtain a semi-finished product B. The semi-finished product I was obtained by cutting the rear end portion by t _i and b _i respectively, and after rolling, the front end portion and the rear end portion were cut by t _j and b _{j respectively} to obtain a semi-finished product J. Repeatedly, the front end and the rear end of the semi-finished product immediately before the final product are cut by t _n and b _n , _respectively , to obtain the final product N.

The matrix M of the tip length of the region of the p _o from each semi-finished product A-J, respectively from the distal end portion in the final formed article N p
₁ , p ₂ ... P _i , p _j ... _Pn correspond to the area, and the area of the length s ₀ from the rear end of the base material M is the semi-finished products A to J and the final product N, respectively. S ₁ from the tip,
s ₂ ... s _i, corresponds to the area to the position of s _j ... s _n. The respective half-finished products A-J, excised tip in order to obtain a final formed product N, the length t ₁ of the rear end _{portion, t 2 ... t n b 1} , b 2
.., B _n on the base material M are t ₁ ′ _, t ₂ ′,.
t _n ′ _, b ₁ ′ _, b ₂ ′... b _n ′.

The base material M, semi-finished products A to J, and final product N
The mutual relationship is expressed by the following equation. The converted length t _i ′ on the base material M of the cutting length t _i from the tip of the semi-finished product I obtained in the step _i is given by the following equation. t _i ′ = t _i · W _i / W ₀ (2) Accordingly, the base material M corresponding to the total length cut from the front end portion from the first step to the i-th step, that is, from the semi-finished products A to I The above operation length y is given by the following equation (3).

[0017]

(Equation 1)

Further, between the base material M and the semi-finished product I, a dimension p ₀ from the tip of the base material M, and a portion corresponding to the dimension p ₀ and remaining in the semi-finished products I and J p
The relationship between _i and p _j is given by the following equations (4) and (5).

[0019]

(Equation 2)

Based on the base material M, the correspondence of the parts between the semi-finished products I and J is obtained from the equations (4) and (5) as shown in the equation (6).

[0021]

(Equation 3)

This can be rewritten as in equation (7).

[0023]

(Equation 4)

Similarly, a dimension s ₀ from the rear end of the base material M between the base material M and the semi-finished product I, and a portion corresponding to this length region and remaining in the semi-finished product I s _i
Is given by the following equation (8).

[0025]

(Equation 5)

[0026] This allows matching portion between the length p _j from the tip portion of the length p _i and j step semi-finished products J manufactured by from the tip portion of the semi-finished product I, prepared by step i .

FIG. 5 shows only the leading end of the semi-finished product at t ₁ and t _{1 respectively} .
FIG. 3 is an explanatory diagram in a case where only _{2 to} t _i and t _j are cut off and rolled. In the figure, M indicates a base material, and A, B, -I, and J indicate semi-finished products. The length of the base material M is L ₀ , the weight ratio W ₀ , the semi-finished product A,
B, ~I, the length of J each are _{L 1, L 2 ~L i,} L j, the weight ratio is _{W 1, W 2 ~W i,} W j.

After the base material M is rolled in one step, the tip is cut off by t ₁ to obtain a semi-finished product A.
After being rolled in the process, the tip is cut off by t ₂ to obtain a semi-finished product B. Similarly, after being rolled in the i step, the tip is cut off by t _i to obtain a semi-finished product I. I
Is rolled in the j step, and the tip is cut off by t _j to obtain a semi-finished product J.

The length p ₁ of the tip of each semi-finished product A, BI to J corresponding to the length p ₀ of the tip of the base material M,
Relationship with p _{2 to} p _i , p _j , each semi-finished product A, B, to I, J
To obtain the lengths of t ₁ , t ₂ ~
The relationship between t _i , t _j and the corresponding converted lengths t ₁ ′, t ₂ ′ to t _i ′, t _j ′ on the base material M is shown in FIG. 〜I and J are substantially the same as in the case of the distal excision.

The length at the rear end of each semi-finished product corresponding to the predetermined length of the rear end of the base material when only the rear end of the material is cut off when obtaining the semi-finished products A, BI to J, and each semi-finished product The relationship between the base material M and the converted length on the base material shown in FIG. This is substantially the same as the equation (8).

Although not specifically shown, the intermediate part of the semi-finished product may be cut off if the intermediate part in the longitudinal direction of the semi-finished product has a defect. In this case, the semi-finished product is divided into two parts. For the semi-finished product, it can be considered that the front end or the rear end is cut off, and the same relational expression as that shown in FIG. 4 can be applied. In the above-described embodiment, the case where the material of the semi-finished product is constant is described. However, even if the material is different on the way, the same relationship can be obtained by using the specific gravity.

[0032]

In the above, as the present invention a method according to the present invention, the plate or strip shaped-products of the manufacturing process by rolling <br/>, tip of the semi-finished products, also even if cut the rear end portion mother Material, each semi-finished product,
From the relationship between the longitudinal direction each part of the site by previously obtained correspondence relationship semi-finished products between each other, or its preform during the final finished product another, workpiece mutual influence among processes for quality control The present invention has an excellent effect, for example, the analysis of

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of an apparatus for implementing a quality control method for a plate-shaped or strip-shaped product according to the present invention.

FIG. 2 is an explanatory diagram showing a mode of storing data in a storage unit.

FIG. 3 is a flowchart showing a process of a quality control method for a plate-shaped or strip-shaped product according to the present invention.

FIG. 4 is an explanatory diagram and a process explanatory diagram in a case where both ends of each semi-finished product are cut off.

5A and 5B are an explanatory diagram and a process explanatory diagram in a case where only a front end portion of a semi-finished product is cut off.

6A and 6B are an explanatory view and a process explanatory view showing a relationship between both ends in a longitudinal direction of a base material and a semi-finished product.

FIG. 7 is an explanatory diagram and a process explanatory diagram when both ends of a semi-finished product are cut off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Quality control apparatus main body 2 Measuring instrument group 3 Measuring instrument group 4 Storage device

Claims (1)

(57) [Claims] 1. A plurality of rolling processes from a plate-shaped or strip- shaped base material
In the process of making a plate-shaped or strip-shaped final product through one or more semi-finished products whose front end or rear end is cut off during the process
A quality control method for plate-shaped or strip-shaped products.
The cutting length of the semi-finished product whose front or rear end has been cut off, and
Weight or cross-sectional area per unit length of base material, semi-finished product, final product
Look, the cut length portion of each of the semi-finished product in terms of the length of the base material, plate or strip, characterized in that it comprises the tip of the semi-finished products, the process of obtaining the position on the base material of the rear end portion Quality control method for molded products.