QUALITY MANAGEMENT SYSTEM

Abstract

A quality management system for rolled materials is provided, capable of integrating and managing multiple quality elements along the longitudinal direction of the rolled material. This quality management system for hot-rolled materials includes: a rolled material data acquisition unit that captures measurement quality data, control data, and basic information about the rolled material; a measurement quality conversion unit that converts the measurement quality data into measurement quality data for each position along the longitudinal direction of the rolled material; and a calculation quality calculation unit that derives calculation quality data for each position along the longitudinal direction from the control data.A quality information integration unit that integrates the measurement quality data and the computational quality data and stores quality information for each rolled material with a position in a longitudinal direction as a key in a quality information storage unit; a quality grade assessment unit that assesses a quality grade for each position in a longitudinal direction of a rolled material based on quality information stored in the quality information storage unit and a quality standard, which is a standard regarding quality, stored in a quality standard storage unit; and a quality assurance input / output unit that displays a quality grade assessment result.

Description

Technical area

[0001] The present invention relates to a technique used for quality management of a rolled material. State of the art

[0002] In the hot rolling area, a slab is rolled ten times or more at an initial temperature of approximately 1200 °C to produce a rolled material with a length of 400 to 2000 m. A rolled material product must meet a predetermined quality throughout its entire length.

[0003] PTL 1 discloses a technique for determining whether structural and material specifications are met based on a calculation value of a structural and material model and order information. If the determination result does not meet the structural and material specifications, assigning order information that can be associated with the rolled material by retrieving the order database. According to PTL 1, the use of this technique enables efficient manufacturing of a product that meets the structural and material specifications required by customers.

[0004] PTL 2 discloses a technique that includes a structural information sensor and a mechanical property predictor, determines the material quality of the rolled material by comparing the mechanical property predicted by the mechanical property predictor with a preset allowable range of the mechanical property, records the determination result in conjunction with position information in a longitudinal direction of the rolled material, and determines the length of a cut-off part of the rolled material based on the recorded content. According to PTL 2, the use of this technique enables optimization of a part where a rolled material is cut off and remarkable improvement in delivery yield even when material variation is generated in the longitudinal direction of the rolled material. Citation listPatent literature PTL 1: JP 2008-168320 A PTL 2: JP 2009-166087 A Summary of the inventionTechnical problem

[0005] Since the technique of PTL 1 integrally determines whether the entire rolled material is acceptable for the order specifications of the structure and material or not, there is a risk that even in a case where even a part of the product does not meet the specifications due to variations in the structure and material of the rolled material, the entire rolled material will be delivered as a product with a lower quality than the original order or will be rejected.

[0006] The technique of PTL 2 solves the above problem of PTL 1 by recording the quality determination result of the material in conjunction with the position information in the longitudinal direction of the rolled material and determining the length of the cut-off part based on the recording. However, since the length of the cut-off part is uniformly determined based on the quality determination with respect to the specifications, there is a possibility of increased waste of resources and energy due to excessive cut-off processing.

[0007] Furthermore, the technique of PTL 1 does not consider quality elements other than structure and material, and therefore, even if the rolled material is determined to meet the structure and material specifications, there is a possibility of non-compliance with other quality elements.

[0008] It is stated that the technique of PTL 2 enables determination in combination with the quality, such as temperature, the thickness of a rolled material, the width of the rolled material, and the shape of the rolled material, in addition to the material. However, only a combination of a plurality of qualities is possible, and a method for determining the length of the cut-off part when the plurality of qualities are combined is not disclosed at all.

[0009] In view of the foregoing, an object of the present invention is to provide a quality management system of a rolled material that can integrate and manage a plurality of quality items with respect to a longitudinal direction of the rolled material. Solution to the problem

[0010] To solve the above problems, a quality management system of the present invention is a quality management system that manages the quality of a hot-rolled material, the quality management system including: a rolled material data acquisition unit that acquires measurement quality data of a rolled material acquired by a sensor included in a hot-rolling mill, control data including operation information of the hot-rolling mill, and basic information of the rolled material; a measurement quality conversion unit that converts the measurement quality data into measurement quality data for each position in a longitudinal direction of the rolled material; a calculation quality calculation unit that obtains calculation quality data for each position in a longitudinal direction from the control data;a quality information integration unit that integrates the measurement quality data and the calculation quality data and stores, in a quality information storage unit, quality information for each rolled material with a position in a longitudinal direction as a key; a quality grade judgment unit that judges a quality grade for each position in a longitudinal direction of a rolled material based on quality information stored in the quality information storage unit and a quality standard, which is a standard regarding quality, stored in a quality standard storage unit; and a quality assurance input / output unit that displays a judgment result of the quality grade on a display unit. Other aspects of the present invention will be described in the embodiments described later.

[0011] The disclosure of Japanese priority application 2023-097887 (filing date June 14, 2023) is hereby incorporated by reference. Advantageous effects of the invention

[0012] According to the present invention, a plurality of quality elements can be integrated and managed in the longitudinal direction of a rolled material. Short description of the drawings [ Fig. 1] Fig. 1 is a block diagram illustrating a configuration example of a quality management system according to a first embodiment. [ Fig. 2] Fig. 2 is a schematic view illustrating a cross-sectional shape perpendicular to a longitudinal direction of a rolled material. [ Fig. 3] Fig. 3 is a view showing an example of cross-sectional shape data of a rolled material. [ Fig. 4] Fig. 4 is a view showing an example of width data of a rolled material. [ Fig. 5] Fig. 5 is a schematic view showing an example of a winding deviation of a rolled material. [ Fig. 6] Fig. 6 is a view showing an example of winding deviation data of a rolled material. [ Fig. 7] Fig. Figure 7 is an explanatory diagram showing an example of a section. [ Fig. 8] Fig. 8 is an explanatory diagram relating to a conversion of winding deviation data of a rolled material. [ Fig. 9] Fig. 9 is a view showing an example of quality information of a rolled material. [ Fig. 10] Fig. 10 is a view showing an example of a quality standard stored in a quality standard storage unit. [ Fig. 11] Fig. 11 is a flowchart showing processing of a quality judgment unit. [ Fig. 12] Fig. Figure 12 is a view showing an example of a quality data matrix. [ Fig. 13] Fig. Figure 13 is a view showing an example of a quality objective matrix. [ Fig. 14] Fig. Figure 14 is a view showing an example of a quality standard matrix. [ Fig. 15] Fig. Figure 15 is a view showing an example of a quality score matrix. [ Fig. 16] Fig. 16 is a view showing an example of a quality display to be displayed on a screen of a quality assurance input / output unit. [ Fig. 17] Fig. 17 is a block diagram illustrating a configuration example of a quality management system according to a second embodiment. [ Fig. 18] Fig. 18 is a flowchart showing processing of a cutout suggestion judging unit. [ Fig. 19] Fig. 19 is a view showing an example in which cutout suggestion judgment data is displayed in the quality assurance input / output unit. [ Fig. 20] Fig. 20 is a view showing another example in which cutout suggestion judgment data is displayed in the quality assurance input / output unit. Description of embodiments

[0013] Embodiments of the present invention will be described in detail below with reference to the drawings. Note that common components are designated by identical reference numerals throughout the drawings, and redundant descriptions are omitted. <Erste Ausführungsform>

[0014] Fig. 1 is a block diagram illustrating a configuration example of a quality management system 3 according to the first embodiment. Fig. Figure 1 illustrates an example of the configuration of the quality management system 3, which includes a hot rolling mill 1 and a hot rolling control system 2. The hot rolling mill 1 is equipped with a heating furnace 110, a conveyor line 111, a roughing mill 112, a cutting machine 113, a finishing mill 114, a cooling device 115, and a coiling machine 116. The roughing mill 112 includes one rolling stand, while the finishing mill 114 includes a plurality of rolling stands arranged side by side along the conveyor line 111.

[0015] After being heated in the heating furnace 110, a rolled material 100 is rolled several times through the roughing mill 112 and the finishing mill 114 while moving on the conveyor line 111.

[0016] The head end or tail end of the rolled material 100 may be distorted in shape after being rolled by the roughing mill 112. In this case, the distorted part is cut off in shape by the cutting machine 113, and then the rolled material 100 is fed into the finishing mill 114, which comes next.

[0017] A plurality of cooling nozzles are arranged in the cooling device 115, and the hot rolling control system 2 controls the opening degree of each nozzle according to the temperature or temperature history of the rolled material 100, which is a control target.

[0018] In hot rolling mill 1, thermometers measuring the temperature of the rolled material 100 are installed at several locations. Fig. 1 illustrates, as an example, a configuration in which a roughing-rolling inlet thermometer 120, a roughing-rolling outlet thermometer 121, a finishing-rolling inlet thermometer 122, a finishing-rolling outlet thermometer 123, and a coiling-machine inlet thermometer 124 are installed. As another configuration, a thermometer may be additionally installed between stands of the finishing mill 114. There is also a case where a thermometer is additionally installed in the cooling device 115. Each of these thermometers measures and outputs, as control data, the temperature of the rolled material 100 passing through an observation point of the thermometer to the hot rolling control system 2.

[0019] It should be noted that, although not shown as an independent measuring instrument, each rolling stand of the rough rolling and finish rolling is provided with a measuring instrument that measures the condition of a roll, including the load applied to the rolled roll and the rotational speed of the roll for the purpose of rolling control, and the data is also output as control data to the hot rolling control system 2.

[0020] In the hot rolling mill 1, measuring instruments including a thickness gauge 130 and a width gauge 131 are arranged at an outlet side of the finishing mill 114 to measure the quality of the rolled material 100. These measuring instruments measure and output the thickness or width of the rolled material 100 passing through each observation point to the hot rolling control system 2 as measurement quality data.

[0021] Although in Fig. 1, a measuring instrument that measures a winding deviation (telescope) generated when the rolled material 100 is wound by the winding machine 116 may be arranged after the winding machine 116.

[0022] The hot rolling control system 2 includes a control setting unit 200 that sets control target values, including the thickness, width, movement speed, and temperature of the rolled material 100; a control arithmetic unit 201 that calculates a setting value for achieving the control target value based on control data input from the hot rolling mill 1; and a control output unit 202 that outputs the calculated setting value to the hot rolling mill 1. The hot rolling control system 2 also includes a data collection unit 203 that collects the setting values ​​and control data output from the control output unit 202, and the measurement quality data output from the hot rolling mill 1; and a data storage unit 210 that stores the data collected by the data collection unit 203 and basic information of the rolled material.

[0023] Here, the basic information of the rolled material 100 includes identification symbols of the rolled material, such as a slab number and a rolling stock number; product type symbols of the rolled material, such as a steel type, chemical composition of the rolled material; and a target quality of the rolled material. The target quality includes, for example, a target thickness, a target width, and a target yield strength of the rolled material. The specific target quality content is determined by a sequence or type of the rolled material.

[0024] The rolled material quality management system 3 of the present embodiment includes a quality assurance input / output unit 300, a rolled material data acquisition unit 301, a measurement quality conversion unit 310, a calculation quality calculation unit 320, a quality information integration unit 330, a quality information storage unit 331, a quality grade judgment unit 332, and a quality standard storage unit 333. These functions will be described in detail later.

[0025] Fig. Figure 2 is a schematic view illustrating a cross-sectional shape perpendicular to the longitudinal direction of the rolled material 100. Examples of measurement quality data stored in the data storage unit 210 include the cross-sectional shape of the rolled material measured by the thickness gauge 130. The thickness may vary depending on the position in the width direction, and Fig. 2 shows an example of measuring thickness h C , h S1 and h S2 at three positions of a center point (center in the width direction) and side 1 and side 2, which are equidistant from the center in the width direction, and evaluating a cross-sectional shape. The cross-sectional shape to be evaluated is, for example, a mean thickness at the three points, a crown, which is a symmetrical component with respect to the center of a thickness variation in the width direction, and a wedge, which is an asymmetrical component with respect to the center of a thickness variation in the width direction. The following equations represent details. Average thickness = (hc + hs1 + hs2) / 2 Crown=hc−(hs1+hs2) / 2 Wedge=hs1−hs2

[0026] Fig. 3 is a view illustrating an example of cross-sectional shape data of the rolled material 100.

[0027] Fig. 3 illustrates an example of cross-sectional shape data stored in the data storage unit 210. The cross-sectional shape data includes an identification symbol of the rolled material, multiple measurement times at intervals of 0.1 seconds, an average thickness, a crown, and a wedge at each measurement time.

[0028] Fig. 4 is a view showing an example of width data of the rolled material 100. Fig. 4 illustrates rolled material width data as another example of the measurement quality data stored in the data storage unit 210. The width data includes an identification symbol of the rolled material, a plurality of measurement times at intervals of 0.12 seconds, and a width of the rolled material measured at each measurement time.

[0029] Since the time at which the rolled material 100 reaches the thickness gauge 130 and the width gauge 131 are different, the cross-sectional shape data shown in Fig. 3 and the latitude data shown in Fig. 4, differ in terms of the measurement time for the same rolled material. Since the measuring instruments are different, the time intervals of the recorded data may vary.

[0030] The examples given in Fig. 3 and Fig. 4 are time series data in which measurement quality data is recorded for each measurement time point. Among the measurement quality data stored in the data storage unit 210, non-time series data includes winding deviation data.

[0031] Fig. Fig. 5 is a schematic diagram illustrating an example of a winding deviation of the rolled material 100. An outer shape 5A of Fig. Figure 5 illustrates a scene in which a long rolled material 100 is wound around a coil by the winding machine 116, and then a deviation occurs in an end portion. This unevenness of the end portion after winding is a winding deviation (telescoping). A cross section 5B of Fig. 5 illustrates a measurement example of a winding deviation. The height of an end part of the rolled material is measured while scanning a radial direction of winding using a laser displacement meter or the like, and the height at each winding position is recorded.

[0032] Fig. 6 is a view illustrating an example of winding deviation data of the rolled material 100. Fig. Figure 6 illustrates an example of coil deviation data stored in the data storage unit 210. The coil deviation data includes an identification symbol of the rolled material, a plurality of coil positions, and a height measured at each coil position. The data storage unit 210 also stores control data in addition to the measurement quality data. The control data to be stored includes the load and rotational speed of a roll of the rolling mill, the temperature of the rolled material, and the opening degree setting of the cooling nozzle in the cooling device. These are time-series data and are stored for each rolled material at each time point, as shown in Fig. 3 or Fig. 4 shown.

[0033] The data storage unit 210 stores time series measurement quality data, non-time series measurement quality data, and time series control data, as described above. Each time series data has a unique start time and a unique time interval.

[0034] With further reference to Fig. 1, the quality assurance input / output unit 300 inputs various settings related to the operation of the quality management system 3 of the present embodiment on a display unit (not shown) and outputs a quality assessment result. The settings input by the quality assurance input / output unit 300 include the following. (A) Identification symbol of the rolled material subject to quality assurance (B) Length of section

[0035] The identification symbol of the rolled material is a symbol assigned to each hot-rolled material that is hot-rolled and coiled and is often a combination of characters and numbers, such as AX01000011, which can be found, for example, in Fig. 3, Fig. 4 and Fig. 6. The quality assurance input / output unit 300 inputs an identification symbol of one or more rolled materials subject to quality assurance. (Section)

[0036] In the present embodiment, the rolled material is divided into a plurality of sections along the longitudinal direction, and the quality is managed for each section. The section is a virtual unit for quality management and does not mean that the rolled material is actually cut.

[0037] Fig. 7 is an explanatory diagram showing an example of the section. The length of each section may be constant or may vary depending on the position in the longitudinal direction. For example, the length of the section may be shortened near a head end and a tail end where a possibility of quality change is relatively high, and the length of the section may be increased in other parts. The adjustment of such a section is performed by the quality control input / output unit 300. Note that, since the length of the rolled material changes with rolling, the length of the section for quality management is adjusted based on the length after the end of rolling, that is, the length of the rolled material at the outlet side of the finishing mill 114. (Rolling material data acquisition unit 301)

[0038] The rolling material data acquisition unit 301 acquires from the data storage unit 210 and outputs to the measurement quality conversion unit 310 and the calculation quality calculation unit 320 the basic information, the control data, and the measurement quality data of the rolled material corresponding to the identification symbol of the rolled material input by the quality assurance input / output unit 300.

[0039] As described above, the measurement quality data acquired from the data storage unit 210 by the rolling material data acquisition unit 301 is generally stored with an amount other than the position in the longitudinal direction of the rolled material as a key. For example, the thickness data of the rolled material is stored with the acquisition time as a key, and the winding deviation data is stored with the winding position as a key. The measurement quality conversion unit 310 converts the measurement quality data input from the rolling material data acquisition unit 301 into measurement quality data in each section. The following describes the operation of the measurement quality conversion unit 310 using thickness data and winding deviation data as examples. (Measurement quality conversion unit 310)

[0040] First, a conversion of thickness data is described as an example of time series measurement quality data.

[0041] In order to obtain a corresponding position X from time-series measurement quality data, such as the thickness data, the measurement quality conversion unit 310 utilizes that a device, such as the thickness gauge 130, which measures the quality in time series is arranged at the outlet side of the final stand of the finishing rolling mill 114.

[0042] First, the time at which the load on the roll of the final stand of the finishing mill 114 rapidly increases is estimated as the time at which the head end of the rolled material reaches the roll. Let this time be t0.

[0043] Next, a peripheral speed Vr of the roller at time t i using the following equation (1). Vr[ti]=2×π×R×ω[ti]

[0044] Here, R is the radius (m) of the roller and ω is the number of revolutions per unit time (revolution / s) of the roller and generally changes with time. R and ω [t i ] are stored in the data storage unit 210 as control data and are input to the measurement quality conversion unit 310 through the rolling material data acquisition unit 301.

[0045] Note that the square brackets [] in the above equation indicate that t i The value that Vr can assume is a discrete value because the measurement of various data in a hot rolling line is performed in discrete time. The square brackets have the same meaning in the following.

[0046] Next, the moving speed Vs of the rolled material 100 is obtained using the following equation (2). Vs[ti]=fs[ti]×Vr[ti]

[0047] Here, fs is an amount called forward slip and represents a relationship between Vs generated when the rolled material 100 is stretched by rolling in the longitudinal direction and the peripheral speed Vr of the rolled roll.

[0048] For example, fs can be calculated by the following equation (3). fs[ti]=0.25×(hin[ti]−hout[ti]) / hout[ti]

[0049] Here are h in and h OUT the thicknesses of the rolled material at the roll inlet side and the outlet side.

[0050] Another method for calculating fs can be used.

[0051] Next, the position X in the longitudinal direction corresponding to time t i recorded at the final stand of the finishing mill 114, using the following equations (4) and (5). X[t0]=0 X[ti]=Vs[t1]Δt+Vs[t2]Δt+⋯+Vs[ti]Δt

[0052] By the above procedure, the measurement time t i the control data in the final stand of the finishing mill 114 into a position X[t i ] in the longitudinal direction of the rolled material.

[0053] If the distance from the final stand of the finishing mill 114 to the thickness gauge 130 is L, the time t' i to which the point X[t i ] of the rolled material reaches the thickness gauge 130 can be calculated by the following equation (6). t'i=ti+L / Vs[ti]

[0054] Therefore, the quality of the cross-sectional shape corresponding to the position X[t i ], data with the measurement time t' i among the cross-sectional shape data stored in the data storage unit 210.

[0055] If the stored measurement time does not match t' i matches, data on t' i using multiple data at measurement time near t' iFor this calculation, a linear interpolation method, a spline interpolation method, a Laplace interpolation method, or the like can be used. For example, in the case of using the linear interpolation method, t i , the t i ≤ t' i ≤ t i + 1 = t i + Δt with respect to the measurement time t' i is obtained from the time series of the control data of ω, and then X[t' i ] can be obtained by the following equation (7). X[t'i]={X[ti](ti+1−t'i)+X[ti+1](t'i−ti)} / (ti+1−ti)

[0056] After calculating X' i = X[t' i ], which of time t' i corresponds to which the thickness data h[t' i ] using the above processing, the measurement quality conversion unit 310 converts with h[X' i ] = h[t' i ] Time series measurement quality data h[t' i] in measurement quality data h[X' i ] at a position in the longitudinal direction of the rolled material.

[0057] Next, the measurement quality conversion unit 310 determines the section to which X' i belongs, using the section length setting input by the quality assurance input / output unit 300, and adds h[X' i ]\ to the section's thickness data arrangement.

[0058] By performing the above processing for all times t' at which the thickness data h is recorded, all the thickness data are added to the thickness data array of the corresponding section.

[0059] Next, a representative thickness of the section is determined using the thickness data array of the section. If there is one piece of thickness data in the thickness data array, the thickness is the representative thickness of the section. If there are multiple pieces of thickness data in the thickness data array, a value farthest from the target thickness in the thickness data is the representative thickness of the section. If the number of pieces of thickness data in the thickness data array is zero, a value into which a representative thickness of a surrounding section is interpolated is the representative thickness.

[0060] The measurement quality conversion unit 310 can convert time series thickness measurement quality data into thickness measurement quality data of the section through the above processing.

[0061] The above is an example of the cross-sectional shape data measured by the thickness gauge 130, but the present invention can also be applied to other time-series measurement quality data measured by a measuring instrument arranged at the outlet side of the final stand of the finishing mill 114.

[0062] Next, a conversion of winding deviation data is performed with reference to Fig. 8 is described as a conversion example with respect to measurement quality data that is not a time series of the measurement quality conversion unit 310.

[0063] Fig. Figure 8 is an explanatory diagram relating to a conversion of winding deviation data of the rolled material. First, the radius of a coil is defined as an inner radius R. inof the wound rolled material (hereinafter coil) and 1 / 2 of the difference between the maximum value and the minimum value of the winding position is defined as an outer diameter R out the coil is defined.

[0064] Next, the angle θ0 to the tip end of the rolled material is obtained using a scanning line at the time of winding deviation measurement as a reference line. Assuming that the angle in the winding direction from the reference line is +, the angle in the direction opposite to the winding is -, and the unit of θ0 is radian, the range is -π < θ0 ≤ π.

[0065] Next, a radial coordinate r = [|R out - z| from the coil center from a winding position z.

[0066] When the position z of the winding deviation measuring point is converted into a polar coordinate system centered on the coil center, the definition of the angle becomes the coordinates of the measuring point of 0 ≤ z < R out (r, π) and the coordinates of the measuring point of R out < z ≤ 2*R out become (r, 0).

[0067] After the above coordinate transformation, a distance X of the point of polar coordinates (r, φ) from the head end of the rolled material can be obtained by the following equation (8). X[r,φ]=π×((r−hm)2−Rin2) / hm+r×(φ−θ0)

[0068] Here hm is an average thickness of the rolled material.

[0069] Therefore, X corresponding to the winding position z is obtained by the following equations (9) and (10). z range of 0≤z <Rout: X[z] = π×((|Rout−z|−hm)2−Rin2) / hm+|Rout−z|×(π−θ0) z Area of ​​Rout <z≤2*Rout: X[z] =π×((|Rout−z|−hm)2−Rin2) / hm−|Rout−z|×θ0

[0070] The above method obtains X from z using the angle θ0 to the head end of the rolled material, but X can also be obtained from z using an angle θ1 to the tail end of the rolled material. This method obtains θ0 from θ1 using the following equation (11) using the fact that the X value, X [R out , θ1], of the rear end of the rolled material equal to a total length X tot of the rolled material. θ0=[π×((Rout−hm)2−Rin2) / hm−Xtot] / Rout+θ1

[0071] By obtaining θ0 from θ1 by the above equation, X can be calculated from z using the angle θ1 to the rear end of the rolled material in the coil.

[0072] After calculating X i = X [z i ], which corresponds to a measuring position z icorresponds to the winding deviation data e[z i ] using the above processing, the measurement quality conversion unit 310 converts with e [X i ] = e[z i ] Non-time series measurement quality data e[z i ] in measurement quality data e[X i ] at the position in the longitudinal direction of the rolled material. Next, the measurement quality conversion unit 310 determines the section to which X i belongs, using the section length setting input by the quality assurance input / output unit 300, and adds e[X i ] to the arrangement of the winding deviation data of the section.

[0073] By performing the above processing for all measurement positions z at which the winding deviation data e is recorded, all the winding deviation data are added to the winding deviation data array of the corresponding section.

[0074] Next, a representative winding deviation of the section is determined using the winding deviation data array of the section. If there is one piece of winding deviation data in the winding deviation data array, the winding deviation is the representative winding deviation of the section. If there are multiple pieces of winding deviation data in the winding deviation data array, a value farthest from the target winding deviation in the winding deviation data is the representative winding deviation of the section. If the number of pieces of winding deviation data in the winding deviation data array is zero, a value into which the representative winding deviation of the adjacent section is interpolated is the representative winding deviation.

[0075] The measurement quality conversion unit 310 can convert the non-time series winding deviation measurement quality data into the winding deviation measurement quality data of the section through the above processing.

[0076] As described in the above example, the measurement quality conversion unit 310 converts the time series measurement quality data and the time series measurement quality data into the measurement quality data in each section. The measurement quality conversion unit 310 outputs the calculation quality data of the section to the quality information integration unit 330. (Calculation quality calculation unit 320)

[0077] After setting one or more calculation points for each section according to the section set by the quality assurance input / output unit 300, the calculation quality calculation unit 320 obtains the calculation quality at each calculation point using the basic information of the rolled material and the control data input from the rolling material data acquisition unit 301. The calculation quality includes a tensile strength, a yield strength, and an elongation. The following describes the actions of the calculation quality calculation unit 320.

[0078] In a calculation quality calculation model for obtaining the calculation quality, such as the tensile strength, yield strength, and elongation of the rolled material produced by hot rolling, the yield strength, tensile strength, elongation, and the like of the calculation point after rolling are calculated based on the history of the temperature, elongation, and strain rate that occur when the calculation point is located on the rolled material 100 between the outlet of the heating furnace 110 and the inlet of the coiling machine 116. Examples of such a calculation quality calculation model include a calculation quality calculation model disclosed in "Control and Prediction of Material" (1988, The Iron and Steel Institute of Japan).

[0079] The calculation quality calculation unit 320 calculates from the control data a history of the temperature, strain, and strain rate at a calculation point, which is necessary to maintain the calculation quality. Since the control data is measured in time series and stored in the data storage unit 210, the processing of calculating the control data corresponding to the position of the calculation point is common to the processing of converting the time series measurement quality data into the measurement quality data of the section by the measurement quality conversion unit 310, except for the use of an equivalent position X', which will be described later.

[0080] The use of the equivalent position X' in the processing of calculating the control data corresponding to the position of the calculation point in the calculation quality calculation unit 320 results from the need for an arithmetic operation with respect to the control data upstream of the final stand of the finishing mill 114, that is, on the heating furnace 110 side. The rolled material 100 is rolled multiple times on the upstream side of the final stand of the finishing mill 114, and the rolled material 100 becomes long each time. For this reason, the length of the section, which is set based on the length of the rolled material 100 at the outlet side of the finishing mill 114, and the position X of the calculation point provided for each section also change each time of rolling.

[0081] In response to the change in the position X of the calculation point described above, the control data processing in the calculation quality calculation unit 320 uses the equivalent position X' corresponding to the change in a thickness h instead of the coordinate X, which is fixed. X'(h')=X×h / h'

[0082] Here, X and h are the position and thickness of the calculation point at the outlet side of the final stand of the finishing mill 114, respectively. X' is the equivalent position of X at any point on the hot rolling mill, and h' is the thickness at that point.

[0083] However, the inventors have found that when the equation of the equivalent position X' of the equation (12) is also applied between the heating furnace 110 and the inlet of the cutting machine 113, a large error occurs between the head end and the tail end of the rolled material 100 in the material calculation result, which will be described later.

[0084] As a characteristic of hot rolling, deformation is likely to occur at the head end or tail end of the rolled material 100, and as a countermeasure, the cutting machine 113, which cuts off the head end or tail end of the rolled material, is placed in the hot rolling mill 1. Since the cutting machine 113 cuts off a part of the rolled material 100, the mass of the rolled material 100 is different between the downstream side and the upstream side of the cutting machine 113. Therefore, the equation of the equivalent position X' described above can only be applied to the downstream side with respect to the cutting machine 113, where the mass of the rolled material 100 is consistent with the mass at the outlet side of the final stand of the finishing mill 114.

[0085] On the upstream side with respect to the cutting machine 113, the equivalent position X' defined by the following equation (13) is used. X'=X×h / h'+x_headcut×h_113 / h'

[0086] Here, x_headcut is the length of the head end part cut off by the cutting machine 113, and h_113 is the thickness of the rolled material 100 in the cutting machine 113.

[0087] Note that here, since X is defined as the distance from the head end of the rolled material 100, the cutting length x_headcut of the head end portion was used. When X is defined as the distance from the tail end of the rolled material, the equivalent position X' can be calculated using a cutting length x_tailcut of the tail end portion.

[0088] The calculation quality calculation unit 320 determines the equivalent position X' in the hot rolling mill 1 corresponding to the calculation point position X through the above processing.

[0089] The calculation quality calculation unit 320 extracts the control data corresponding to the determined X' and generates data such as a temperature history, a strain history, and a strain rate history necessary for calculating the calculation quality calculation model. The processing of extracting the control data corresponding to X' is common to the processing of converting the time-series measurement quality data into the measurement quality data of the section by the measurement quality conversion unit 310 described above. The calculation quality calculation unit 320 outputs the calculation quality data of each section obtained through the above processing to the quality information integration unit 330. Note that the measurement quality data preferably includes a width, a thickness, a crown, a wedge, and / or a coil deviation of the rolled material.The calculation quality data preferably include a yield strength and / or a tensile strength and / or an elongation of the rolled material. (Quality Information Integration Unit 330)

[0090] The quality information integration unit 330 stores the basic information about the rolled material and rolled material quality integration data, which integrates the measurement quality and calculation quality of each section, in the quality information storage unit 331. The rolled material quality integration data is stored together with the section length, using the rolled material identification symbol and the section number as a key. Fig. Fig. 9 is a view showing an example of quality information of a rolled material. In the example of Fig. 9, the position of the representative point of the section is also stored in addition to the above elements. (Quality Assessment Unit 332)

[0091] The quality assessment unit 332 assesses the quality of the rolled material for each section using the rolled material basic information and the rolled material quality integration data stored in the quality information storage unit 331. For this assessment, the quality assessment unit 332 uses the standard for each quality element stored in the quality standard storage unit 333.

[0092] Fig. 10 is a view showing an example of the quality standard stored in the quality standard storage unit 333. Fig. Figure 10 shows data of the thickness quality standard as an example of the quality standard. The data of the thickness quality standard shown has three thickness tolerances of the thickness quality grades for each class of rolled material, the range of the target thickness of the rolled material, and the range of the target width. For example, the standard of a thickness quality standard number 1 in Fig. 10 is a standard applied to a rolled material classified into grade SS-01, where the rolled material has a target thickness range of 0 to 1.60 mm and a target width range of 0 to 1200 mm. Those with an absolute value of the difference between the thickness of the rolled material and the target thickness of 0.11 mm or less are grade 1, those with 0.11 to 0.14 mm are grade 2, those with 0.14 to 0.17 mm are grade 3, and those with more than 0.17 mm are out of grade. Here, the grade of the rolled material is determined by the quality management system operator based on various standards, the chemical composition of the rolled material, and the like. For example, if the rolled material is a steel material, a steel type defined by IS, JIS, or the like can be set as a rolled material grade.It should be noted that the quality standard storage unit 333 may exist outside the quality management system 3 as long as the quality standard is stored and can be used for information processing. The same applies to other storage units.

[0093] Fig. Fig. 11 is a flowchart showing the processing of the quality judgment unit 332. The processing of the quality judgment unit 332 will be explained with reference to the flowchart of Fig. 11. First, the quality assessment unit 332 receives the identification number of the rolled material to be assessed and starts processing (step S100).

[0094] Next, the quality assessment unit 332 reads the rolled material basic information and the rolled material quality integration data corresponding to the rolled material identification number from the quality information storage unit 331, and stores the quality data, such as the thickness and crown of the quality integration data, in a quality data matrix Q (step S101). When the number of quality types to be assessed is N Q and the number of sections of the rolled material N S the quality data matrix Q can be a real matrix of N Q Rows × N S Columns that are in Fig. 12. For example, if the quality elements to be assessed for a particular rolled material are six elements of width, thickness, crown, coil deviation, yield strength and elongation, N Q= 6 and the width data is stored in the first row of the Q matrix and the thickness data is stored in the second row.

[0095] The quality assessment unit 332 then generates a quality target matrix Q T , which stores the target value for each quality element, and a quality quality matrix G, which stores the quality determination result for each quality for each section (step S102). The quality target matrix Q T can be a real matrix of N Q Rows × 2 columns, which in Fig. 13, and the quality matrix G can be, for example, a positive integer matrix of N Q Rows × N S columns. Note that an example of the quality matrix G in Fig. 15, which will be described later.

[0096] In the first and second column of each row of the quality target matrix Q TThe lower limit and upper limit of the target value for the quality element are stored. For example, if the target is a value such as thickness, the same value is stored in the first column and the second column. In a case where only an upper limit is given as a target, such as winding deviation, 0, for example, is stored in the first column and the upper limit is stored in the second column. In a case where only a lower limit is given as a target, such as elongation, the lower limit is stored in the first column, and a sufficiently large numerical value, for example, 10 9 , is stored in the second column.

[0097] Based on the basic information of the rolled material read in step S101, the quality judgment unit 332 determines a quality standard to be applied, reads the quality standard from the quality standard storage unit 333, and stores the quality standard in a quality standard matrix S (step S103). Fig. 14 shows an example of the quality standard matrix S. In the case of the Fig. For the thickness quality standards shown in Figure 10, the applicable thickness quality standard is retrieved, determined, and read based on, for example, the information on the chemical composition, target thickness, and target width in the basic information of the rolled material. The same processing is performed on the other quality elements and stored in the quality standard matrix S. The quality standard matrix S can, for example, be a real matrix of N Q Rows × N G columns. Here N Gthe number of quality grades. Since the number of grades differs for each quality element, N G In general, it should be the maximum value among the number of grades of each quality element to be assessed. Alternatively, it can simply be a sufficiently large positive integer, for example, 100. Each column of S stores tolerance values ​​for each grade.

[0098] For example, if the quality elements to be assessed are six elements of width, thickness, crown, winding deviation, yield strength and elongation, if the thickness quality standard to be applied is the number 2 in Fig. 10, 0.12 is stored in the first column, 0.15 is stored in the second column, and 0.18 is stored in the third column of the second row of the thickness matrix S, which corresponds to the thickness matrix.

[0099] Next, the quality grade judgment unit 332 sets a quality element index m to 1 and starts loop processing for each quality element (step S104). The quality element index corresponds to the row number of the quality data matrix Q, the quality grade matrix G, and the quality standard matrix S. In the loop processing, the quality grade of each section is judged for the quality element designated by the index m (step S105). Assuming, for example, that m = 2 is the thickness grade, the thickness grade of the nth section can be judged by the following method.

[0100] First, a maximum error value D with respect to the target is obtained by the following equation. If QT[2,1]≤Q[2,n]≤QT[2,2],D=0 If Q[2,n]≤QT[2,1],D=QT[m,1]−Q[m,n] If Q[2,n]≤QT[2,2],D=Q[m,n]−QT[m,2] where Q T is the quality target matrix and Q is the quality data matrix.

[0101] Next, the maximum error value D and the standard of the corresponding row of the quality standard matrix S are sequentially compared, and the quality evaluation result is stored in the corresponding row and column of the quality standard matrix G. This processing can be performed, for example, by the following method. If D≤S[2,1],G[2,n]=1 If S[2,1] <D≤S[2,2], G[2,n]=2… If S[2,g−1] <D≤S[2,g], G[2,n]=g… If S[2,NG−1] <D≤S[2,NG], G[2,n]=NG If S[2,NG] <D,G[2,n]=Zahl gro¨ßer als NG, was eine Exceeding the level means (e.g. 1000)

[0102] Here is N G the number of quality grades, and in a case of Fig. 10 shown thickness quality standards of m = 2 is N G = 3.

[0103] By performing the above processing in the range of 1 ≤ n ≤ N Sthe assessment of the thickness quality for all sections ends.

[0104] Next, the quality grade judging unit 332 determines whether the assessment for all quality elements is completed (step S106). If the assessment is not completed (step S106, No), to assess the next quality element, m = m + 1 (step S107), and the process returns to step S105. If the assessment is completed (step S106, Yes), the quality grade judging unit 332 stores the quality grade matrix G in the quality information storage unit 331 (step S108) and terminates the quality grade judgment processing (step S109).

[0105] Through the processing described above, the quality judgment unit 332 can judge the quality of the rolled material for each section using the basic information of the rolled material and the quality integration data of the rolled material stored in the quality information storage unit 331. Fig. Figure 15 shows an example of the quality matrix G for the rolled material of N S = 100. (Quality Assurance Input / Output Unit 300)

[0106] Using the identification symbol of the rolled material whose quality grade is to be confirmed, the quality assurance input / output unit 300 reads the corresponding quality grade matrix G from the quality information storage unit 331 and can display on the screen the grades for the plurality of quality elements over the entire length of the rolled material.

[0107] Fig. Fig. 16 is a view showing an example of the quality display displayed on the screen of the quality assurance input / output unit 300. In the example of Fig. 16, square frames corresponding to the quality elements and sections of the rolled material are arranged in a cell shape, and the grade of the section is displayed in numbers in each square frame. Fig. 16 is an example, and it should be understood that various other display methods exist. For example, the grade may be displayed in a color instead of a number, or a color and a number may be used in combination. Only a part of the grade or section may be selected and displayed, or a section with one or more grades may be selected and displayed. Alternatively, a suitable graph or the like may be used instead of the cell display as in Fig. 16 can be used. When using the graph, for example, the section number can be indicated on the horizontal axis, the quality grade can be indicated on the vertical axis, and each quality element can be represented by a graph with a different color. In addition, the display method can be varied, but the common feature is that grades for a plurality of quality elements are displayed over the entire length of the rolled material.

[0108] With the configuration described above, in the first embodiment, the rolled material can be optimally used by integrating and managing a plurality of quality elements with respect to the longitudinal direction of the rolled material. <Zweite Ausführungsform>

[0109] In the second embodiment of the present invention, to further facilitate optimal use of the rolled material, a cutout suggestion judgment function is provided in the first embodiment. Hereinafter, the second embodiment will be described with reference to the cutout suggestion judgment function, omitting descriptions of parts common to the first embodiment. (Cutting Proposal Assessment Unit 334)

[0110] Fig. 17 is a block diagram illustrating a configuration example of a quality management system 3A according to the second embodiment. A cutout suggestion judgment unit 334 is newly provided. After receiving the quality grade matrix G from the quality assurance input / output unit 300 and generating a plurality of cutout suggestions based on the quality grade matrix G, the cutout suggestion judgment unit 334 judges the quality grade and the length of the rolled product obtained from each cutout suggestion and returns to the quality assurance input / output unit 300.

[0111] Fig. Fig. 18 is a flowchart showing the processing of the cutout suggestion judging unit 334. The processing of the cutout suggestion judging unit 334 will be described with reference to Fig. 18. When starting the processing (step S200), the cutout suggestion judging unit 334 receives the quality grade matrix G from the quality assurance input / output unit 300 (step S201).

[0112] Next, the cutout proposal judging unit 334 generates a set P that is a union of the positions where the quality changes in each quality element (step S202). This processing can be performed, for example, by the following method.

[0113] In the first column, 0 is added to P, In the second column, if G[m, 2] ≠ G[m, 1] itself for some m, 1 is added to P, In the third column, if G[m, 3] ≠ G[m, 2] itself for some m, 2 is added to P, ... In the n-th column, if G[m, n] ≠ G[m, n - 1] itself for some m, n - 1, is added to P, ... In the N S -column is, if G[m, NS ] ≠ G[m, N S - 1] even for some m, N S - 1 added to P, Finally, N S added to P,

[0114] The number of values ​​belonging to the set P is N P In one case, the Fig. For example, the quality matrix G shown in Figure 15 is P = {0, 1, 2, 3, 4, 5, 12, 13, 14, 15, 92, 94, 96, 97, 98, 99, 100} and N P = 17. Assuming that the value belonging to the set P is p, the quality changes in at least one quality element between the p - 1-section and the p-section.

[0115] Next, the cutout proposal judging unit 334 generates a cutout proposal C using P (step S203). For example, in generating the cutout proposal C, the cutout proposal C is a set of one or more unit cutout proposals, and the number of unit cutout proposals included in C is N. C .

[0116] The generation of the cutout proposal C can be performed, for example, by the following procedure. In this example, the unit cutout proposal is generated by a combination {C S , C E} of two integers. Both C S as well as C E represent section numbers, for example C S = 3 represents the final position of section 3, i.e. the boundary line between section 3 and section 4. C S represents a starting point of the cutout of a rolled product and C Erepresents an end point of the cutout. For example, the unit cutout proposal {5, 95} represents the cutting out of an area with the boundary line between sections 5 and 6 as the starting point and the boundary line between sections 95 and 96 as the end point as a rolled product. In the case of this proposal, the rolled product will be sections 6 to 95.

[0117] Using C S < C E the above definition of C always applies S and C E , the unit section proposal, in which the quality grade can change even in a quality element, is {P[1], P[2]}, {P[1], P[3]}, ⋯ ,{P[1], P[NP]}, {P[2], P[3]}, {P[2], P[4]}, ⋯ ,{P[2], P[NP]}, ⋯,{P[n], P[n+1]}, {P[n], P[n+2]}, ⋯ ,{P[n],P[NP]}, ⋯ ,{P[NP−1], P[NP]} and the number becomes NP×(NP−1) / 2.

[0118] A processing method of the cutout suggestion judging unit 334 is a method of outputting the entire set of unit cutout suggestions as cutout suggestion C. This method will be mainly described below. In the above example of N P = 17 is the number of unit cutout proposals contained in C, 136.

[0119] As another method for generating the cutout proposal C, for example, a method for providing a lower limit in C E - C S of the unit cutout proposal to be included in C. This method has an advantage of suppressing the number of unit cutout proposals to be evaluated, but is disadvantageous in that a short cutout of a rolled material cannot be used.

[0120] The cutout suggestion judging unit 334 judges the length of the rolled material to be cut and the quality grade to be obtained for each unit cutout suggestion included in the cutout suggestion C, and generates cutout suggestion judging data U (step S204).

[0121] The cutout suggestion assessment data U can, for example, be a real matrix of (1 + N Q ) Rows × N C columns. Note that the row number of the U-matrix can be in the range 0 to N Q the length of the rolled material to be cut is stored in the 0th row of the U-matrix and the quality grade for each quality element in the 1 to N Q lines are saved.

[0122] The processing of the cutout suggestion judging unit 334 can be performed, for example, by the following method.

[0123] Assuming that the n-th unit cutout proposal contained in C is {C S [n], C E [n]}, the U-matrix is ​​obtained as follows. U[0,n]=length from Cs[n]+1 section to CE[n]section U[1,n]=maximum value from G[1, Cs[n]+1] to G[1,CE[n]] U[2,n]=maximum value from G[2, Cs[n]+1] to G[2,CE[n]] U[m,n]=maximum value from G[m, Cs[n]+1] to G[m,CE[n]] U[NQ,n]=maximum value from G[NQ, Cs[n]+1] to G[NQ,CE[n]]

[0124] As described above, the quality grade of each section for a quality element is stored for each row in the G-matrix, and the higher the quality, the lower the numerical value of the grade becomes. Therefore, in the above example, the m-th quality grade S[m, n] of the rolled material produced by the unit cutout proposal {C S [n], C E[n]} is cut out, the quality of the section with the lowest quality of the m-th quality element among the sections Cs[n] + 1 to C E [n] contained in the rolled material.

[0125] The cutout suggestion judging unit 334 can obtain the cutout suggestion judging data S by performing the above processing with 1 ≤ n ≤ N C generate.

[0126] Next, the cutout suggestion judgment unit 334 outputs the cutout suggestion judgment matrix U to the quality assurance input / output unit 300 (step S205) and ends the processing (step S206).

[0127] The quality assurance input / output unit 300 can set an overall quality by setting a weight for each quality element. The quality assurance input / output unit 300 can calculate a normalization weight Wn by the following equation from weights W[1], W[2], and W[N Q ], which for each of the N Q -Quality elements are set. Wn[m]=W[m] / (W[1]+W[2]+⋯+W[NQ])

[0128] Next, a total grade Utot[n] of the rolled material obtained by a cutting process proposal n can be calculated using the normalization weight Wn. Utot[n]=Wn[1]×U[1,n]+Wn[2]×U[2,n]+⋯+Wn[NQ]×U[NQ,n]

[0129] It should be noted that the above calculation method of the weight setting and the overall quality is an example for the description, and it is understood that various other methods may be applied.

[0130] Fig. 19 is a view illustrating an example in which the cutout suggestion judgment data U is displayed by the quality assurance input / output unit 300. The quality assurance input / output unit 300 displays the cutout suggestion judgment data U on the screen. In the illustrated example, weights W of 7, 10, 8, 6, 9, and 8 are set for quality elements from width to elongation. Using such a display allows the quality assurance input / output unit 300 to specify the result of each cutout suggestion in detail.

[0131] Fig. 20 is a view illustrating another example in which the cutout suggestion judgment data U is displayed by the quality assurance input / output unit 300. In this example, the shorter the cutout length, the easier it is to cut a rolled material into a high-quality product, while utilizing the tendency for the product length to be short. The judgment result of each unit cutout suggestion is displayed with the cutout length and quality grade as two axes. By selecting a point on the graph with a mouse or the like, a corresponding unit cutout suggestion can be displayed. Fig. 20 shows an example in which only the number (e.g., 109) of the clipping suggestion is displayed, but a detailed judgment result of it can be displayed. Fig. Figure 17 is an example where the vertical axis represents the overall quality grade. However, it is also possible to switch the quality grades to be displayed, or to overlay and display multiple quality grades. Such a display is advantageous for easily selecting the most suitable unit cutout proposal when the number of unit cutout proposals is large.

[0132] By evaluating the cutout proposal of the rolled material with the configuration described above, the second embodiment can further facilitate the optimal use of the rolled material compared to the first embodiment by integrating and managing a plurality of quality elements with respect to the longitudinal direction of the rolled material.

[0133] As described above, the quality management system of the present embodiment has the following features. (1) The quality management system 3 that manages the quality of a hot-rolled material includes: the rolling material data acquisition unit 301 that acquires measurement quality data of a rolled material acquired by a sensor included in the hot-rolling mill 1, control data including operation information of the hot-rolling mill 1, and basic information of the rolled material; the measurement quality conversion unit 310 that converts the measurement quality data into measurement quality data for each position in a longitudinal direction of the rolled material; the calculation quality calculation unit 320 that obtains calculation quality data for each position in a longitudinal direction from the control data;the quality information integration unit 330 that integrates the measurement quality data and the calculation quality data and stores, in the quality information storage unit 331, quality information for each rolled material with a position in a longitudinal direction as a key; the quality grade judgment unit 332 that judges a quality grade for each position in a longitudinal direction of a rolled material based on quality information stored in the quality information storage unit 331 and a quality standard, which is a standard regarding quality, stored in the quality standard storage unit 333; and the quality assurance input / output unit 300 that displays a judgment result of the quality grade on a display unit (not shown) (see FIG. 12). Fig. 1). According to this, a plurality of quality elements can be integrated and managed with respect to the longitudinal direction of the rolled material. (2) In the quality management system 3 of (1), the measurement quality data includes the width and / or the thickness and / or the crown and / or the wedge and / or the winding deviation of the rolled material (see Fig. 9). (3) In the quality management system 3 of (1), the calculation quality data shall include a yield strength and / or a tensile strength and / or an elongation of the rolled material (see Fig. 9). (4) In the quality management system 3 of (1), the quality assurance input / output unit 300 displays on the display unit the grade for one or more quality elements assessed by the quality assessment unit 332 over the entire length of the rolled material (see Fig. 13). (5) In the quality management system 3 of (1), the quality management system 3 further includes the cutout proposal judging unit 334 that judges a length and a quality grade of a rolled material obtained for each of a plurality of cutout proposals (see Fig. 14). (6) In the quality management system 3 of (5), the quality assurance input / output unit 300 displays on the display unit a length and a quality grade of a rolled material obtained for each of a plurality of cutout proposals (see Fig. 16). List of reference symbols 1 hot rolling mill 2 Hot rolling control system 3.3A Quality Management System 100 Rolled material 110 heater 111 Förderstraße 112 Roughing mill 113 Cutting machine 114 Finishing mill 115 Cooling device 116 winding machine 200 control setting unit 201 Control arithmetic unit 202 Tax output unit 203 Data collection unit 210 Data storage unit 300 Quality Assurance Input / Output Unit 301 Rolling material data acquisition unit 310 Measurement Quality Conversion Unit 320 Calculation quality calculation unit 330 Quality Information Integration Unit 331 Quality Information Storage Unit 332 Quality Assessment Unit 333 Quality Standard Storage Unit 334 Sectional proposal assessment unit G Quality matrix N Q Number of quality types to be assessed N S Number of sections of rolled material Q Quality Data Matrix Q T Quality target matrix S Quality Standard Matrix U Sectional proposal assessment matrix (sectional proposal assessment data) Utot overall quality of the rolled material QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2008-168320 A

[0004] JP 2009-166087 A

[0004]

Claims

[1] Quality management system that manages the quality of a hot-rolled material, the quality management system comprising: a rolled material data acquisition unit that acquires measurement quality data of a rolled material acquired by a sensor included in a hot rolling mill, control data including operation information of the hot rolling mill, and basic information of the rolled material; a measurement quality conversion unit that converts the measurement quality data into measurement quality data for each position in a longitudinal direction of the rolled material; a calculation quality calculation unit that obtains calculation quality data for each position in a longitudinal direction from the control data; a quality information integration unit that integrates the measurement quality data and the calculation quality data and stores, in a quality information storage unit, quality information for each rolled material with a position in a longitudinal direction as a key; a quality grade judging unit that judges a quality grade for each position in a longitudinal direction of a rolled material based on quality information stored in the quality information storage unit and a quality standard, which is a standard regarding the quality, stored in a quality standard storage unit; and a quality assurance input / output unit that displays a quality assessment result on a display unit. [2] The quality management system according to claim 1, wherein the measurement quality data includes a width and / or a thickness and / or a crown and / or a wedge and / or a coil deviation of a rolled material. [3] The quality management system according to claim 1, wherein the calculation quality data includes a yield strength and / or a tensile strength and / or an elongation of a rolled material. [4] The quality management system according to claim 1, wherein the quality assurance input / output unit displays on the display unit a grade for one or more quality elements judged by the quality grade judging unit over an entire length of a rolled material. [5] The quality management system according to claim 1, further comprising a cutout proposal judging unit that judges a length and a quality grade of a rolled material obtained for each of a plurality of cutout proposals. [6] The quality management system according to claim 5, wherein the quality assurance input / output unit displays on the display unit a length and a quality grade of a rolled material obtained for each of a plurality of cutting proposals.

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