JP2013139049A - Method and device for controlling measuring of thick steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling measuring of a thick steel plate which can suppress a thick steel plate from being manufactured with a plate thickness failure, and to provide a device for controlling measuring of a thick steel plate.SOLUTION: A shearing calculator of a measuring control system obtains plate thickness measurement values of a post-rolled thick steel plate, determines allocation of extra lengths of a top and a bottom of the thick steel plate based on the plate thickness measurement values and product plate thickness tolerances and cuts extra-length parts of the top and the bottom of the thick steel plate to perfect product dimensions. Thus, extra-length parts of the top and the bottom are sheared while paying attention to a plate thickness failure point in each end of the thick steel plate, thereby suppressing a thick steel plate from being manufactured with a plate thickness failure.

Description

  The present invention relates to a thick steel plate measuring control method and a thick steel plate for finishing a thick steel plate to a product size by cutting the extra length of the top (tip portion) and bottom (tail end) of the thick steel plate. The present invention relates to a measuring control device.

  In the thick steel plate shearing line, the top and bottom crops of the thick steel plate are cut in advance with a rough cutting device and conveyed downstream, and after the side crop is cut, the square steel plate is rotated to adjust the squareness. Then, it is cut into product dimensions with a finish cutting device. Here, when cutting the top crop and the bottom crop with a rough cutting device, first, remove the part where the width of the thick steel plate is less than the product width, adjust the squareness, and then necessary with the finishing cutting device The unnecessary surplus length is cut while leaving the cutting allowance (product surplus length) and the sample cost. Thus, in the thick steel plate shear line, the extra length of the thick steel plate is cut in advance with a rough cutting device, and then the thick steel plate is cut into product dimensions with a finish cutting device. This is because if the unnecessary extra length is not cut by the rough cutting device, the extra length must be cut by the finishing cutting device, and the efficiency of the thick plate shear line is reduced. When the thick steel plate has a camber, the thick steel plate is divided in the longitudinal direction, and the squareness is adjusted for each divided thick steel plate to ensure the product width. In that case, the amount of cutting of the top crop and the bottom crop in the rough cutting device is determined in consideration of the cutting allowance required in the finishing cutting device.

  As described above, in the thick plate shearing line, the cutting amount of the top crop and the bottom crop in the rough cutting apparatus is determined in consideration of the plate width of the thick plate steel plate and the planar shape such as the camber. Patent Document 1 discloses a method for determining a cutting position of a top crop in order to ensure product dimensions from an LP steel plate whose thickness changes in the longitudinal direction.

Japanese Patent No. 4323736

  By the way, in actual operation, there may be a case where a plate thickness defect occurs in which the plate thickness is thinner or thicker than expected at the end of the thick plate steel plate. That is, when rolling a thick steel plate, if the set reduction position is not appropriate due to a load prediction error or the like, the rolling roll of the rolling mill is lifted by the reaction force when biting the tip of the thick steel plate. In some cases, a plate thickness error may occur in the end portion of the steel plate due to a delay in the plate thickness control, such as when the thickness is increased, or when the lifted roll is returned to its original state, it is pressed too much to reduce the plate thickness. And if the plate thickness is thinner than planned, it will be rejected. Also, if the plate thickness is thicker than expected, the thickness may be reduced and maintenance may be rejected. In any case, if a plate thickness defect occurs, damage will occur.

  When such a defective plate thickness portion is located at the end of the thick steel plate, if the corresponding portion can be cut with a surplus length, the occurrence of damage can be suppressed. However, in the past, the cutting amount of the extra length on the top side and the extra length on the bottom side is determined without considering the thickness of the thick steel plate. There was a case where the product part was rejected.

  The present invention has been made in view of the above problems, and its purpose is to control a measuring method of a thick steel plate and a measuring control of the thick steel plate that can suppress the production of a thick steel plate having a poor thickness. To provide an apparatus.

  In order to solve the above-mentioned problems and achieve the object, the method for controlling the measurement of a thick steel plate according to the present invention measures the measurement of the thick steel plate to cut the extra length of the top and bottom of the thick steel plate to finish the product dimensions. It is a control method, and based on the step of obtaining the actual plate thickness value of the thick steel plate after rolling, and the actual plate thickness value and the product thickness tolerance, the extra lengths of the top and bottom of the thick steel plate And determining the distribution of.

  Further, in the above invention, the measurement control method of the thick steel plate according to the present invention is based on the step of obtaining the actual temperature value of the thick steel plate after rolling, and the actual temperature value and the steel plate temperature tolerance. Determining the distribution of the extra length of the top and bottom of the thick steel plate.

  Further, in the measurement control method for a thick steel plate according to the present invention, in the above invention, the actual plate thickness value is a hot plate thickness actual value measured by a hot plate thickness meter, and the determined thick steel plate is determined. Obtaining a cold sheet thickness actual value measured by a cold sheet thickness meter after cutting the top and bottom of the thick sheet steel based on the distribution of the surplus length of the top and bottom of the Determining a product surplus length based on the actual thickness value and the product thickness tolerance.

  Further, the measuring control device for a thick steel plate according to the present invention is a measuring control device for a thick steel plate for cutting the extra lengths of the top and bottom of the thick steel plate to finish the product, and the thickness after rolling. Means for obtaining the plate thickness actual value of the plate steel plate, and means for determining the distribution of the extra length of the top and bottom of the plate steel plate based on the plate thickness actual value and the product plate thickness tolerance. It is characterized by.

  Further, in the above invention, the measuring control device for a thick steel plate according to the present invention is based on the means for obtaining the actual temperature value of the thick steel plate after rolling, and the actual temperature value and the steel plate temperature tolerance. Means for determining the distribution of the extra length of the top and bottom of the thick steel plate.

  Further, in the measurement control apparatus for a thick steel plate according to the present invention, in the above invention, the actual plate thickness value is an actual hot plate thickness value measured by a hot plate thickness meter, and the determined thick steel plate Means for obtaining a cold plate thickness actual value measured by a cold plate thickness meter after cutting the top and bottom of the thick plate steel plate based on the distribution of the surplus length of the top and bottom of the Means for determining a product surplus length based on the actual thickness value and the product thickness tolerance.

  According to the measuring control method and apparatus for controlling a thick steel plate according to the present invention, the extra lengths of the top and bottom of the thick steel plate are allocated in consideration of the defective thickness portion at the end of the thick steel plate. Since the cutting amount is determined, it is possible to suppress the production of a thick steel plate having a poor thickness.

FIG. 1 is a schematic diagram showing a configuration of a measuring control system according to an embodiment of the present invention. FIG. 2 is a flowchart showing the flow of the measurement control process according to the embodiment of the present invention. FIG. 3 is a view for explaining a calculation method of the cutting amounts of the top crop and the bottom crop in the measurement control process according to the embodiment of the present invention. FIG. 4 is a view for explaining a calculation method of the cutting amounts of the top crop and the bottom crop in the measurement control process according to the embodiment of the present invention. FIG. 5 is a diagram for explaining a method of calculating the cutting amount of the product surplus length in the measurement control process according to the embodiment of the present invention. FIG. 6 is a diagram for explaining a method of correcting the cutting amount of the product surplus length in the measurement control process according to one embodiment of the present invention. FIG. 7 is a schematic diagram showing a configuration of a measuring control system according to the second embodiment of the present invention. FIG. 8 is a flowchart showing the flow of the measurement control process according to the second embodiment of the present invention. FIG. 9 is a diagram for explaining a method of correcting the cutting amount of the top crop and the bottom crop in the measurement control process according to the second embodiment of the present invention. FIG. 10 is a diagram for explaining a method of correcting the cutting amount of the top crop and the bottom crop in the measurement control process according to the second embodiment of the present invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment. Moreover, in description of drawing, the same code | symbol is attached | subjected and shown to the same part.

(First embodiment)
[Configuration of measuring control system]
First, with reference to FIG. 1, the structure of the measuring control system which is one Embodiment of this invention is demonstrated.

  FIG. 1 is a schematic diagram showing a configuration of a measuring control system according to an embodiment of the present invention. As shown in FIG. 1, a measuring control system 1 according to an embodiment of the present invention includes a rolling mill 11, a heating furnace 12, a hot plate thickness meter 13, a rolling calculator 14, a cooling bed 15, and a rough floor. It has a cutting device 16, a side crop cutting device 17, a cold plate thickness gauge 18, a shear calculator 19, and a finish cutting device 20.

  The rolling mill 11 performs hot rolling to reduce the sheet thickness through the steel material that has been heated in the heating furnace 12 between the rotating rolling rolls 111, and the hot sheet thickness meter 13 is used for the hot-rolled steel material. The sheet thickness is measured and the actual sheet thickness value is notified to the rolling calculator 14. The rolling calculator 14 calculates a target thickness value for controlling the thickness in the rolling mill 11. The cooling floor 15 cools the hot-rolled steel material into a thick steel plate. The rough cutting device 16 cuts the top and bottom crops of the thick steel plate, and the side crop cutting device 17 cuts the side crop of the thick steel plate. The cold plate thickness gauge 18 measures the plate thickness of the cooled thick plate steel plate and notifies the shear calculator 19 of the actual cold plate thickness value. The finish cutting apparatus 20 cuts the product length of the thick steel plate and finishes the thick steel plate to the product dimensions. The shear calculator 19 constitutes a measuring control device according to the present invention, and is constituted by an arithmetic processing device such as a CPU. As will be described later, the shear calculator 19 loads the processing program stored in the ROM (not shown) into the RAM and executes it, thereby performing the measurement control processing of the present embodiment, and the rough cutting device 16 and finishing. The cutting amount of the thick steel plate with the cutting device 20 is determined.

[Measurement control processing]
In the measuring control system 1 having the above configuration, the shear calculator 19 executes the measuring control process shown below, so that the top and bottom of the thick steel plate are considered in consideration of the plate thickness defect portion at the end of the thick steel plate. The amount of cutting is determined by allocating the surplus length. Hereinafter, with reference to the flowchart shown in FIG. 2, the operation of the shear calculator 19 when executing the measuring control process will be described.

  The flowchart shown in FIG. 2 starts at the timing when an instruction to execute the measurement control process is input to the shear calculator 19, and the measurement control process proceeds to the process of step S1.

  In the process of step S <b> 1, the shear calculator 19 obtains a plate thickness actual value (hot plate thickness actual value) from the rolling calculator 14. Thereby, the process of step S1 is completed and the measurement control process proceeds to the process of step S2.

In the process of step S2, the shear calculator 19 first performs a process of calculating the cutting amount of the top crop and the cutting amount of the bottom crop. FIG. 3 is a diagram for explaining a method of calculating the cutting amount at this time, and also illustrates an actual thickness value to be described later. As shown in FIG. 3, the shear calculator 19 first adjusts the perpendicularity of the thick steel plate except for portions (a ₁ , a ₂ ) below the product width of the thick steel plate, and then determines the product dimensions and finish cutting device. At 20, a portion b including a necessary cutting allowance (product surplus length) is secured, and the remaining unnecessary portion (surplus length) is allocated as a top surplus length c ₁ and a bottom surplus length c ₂ . Therefore, the shear calculator 19 calculates the cutting amount of the top crop as a ₁ + c ₁ and the cutting amount of the bottom crop as a ₂ + c ₂ . Incidentally, the cutting amount of the cutting amount and bottom crop top crop top crop cutting position d ₁ and bottom crop cutting position d ₂ are determined. Thereby, the process of step S2 is completed and the measurement control process proceeds to the process of step S3.

In the process of step S3, the shear calculator 19 determines the tolerance between the top part and the bottom part based on the sheet thickness actual value acquired in the product sheet thickness tolerance step S1 indicating the allowable thickness range of the product acquired in advance. Make a decision. That is, for the portion b including the product dimensions and the product surplus secured in step S2, more specifically, the sheet thickness actual value is obtained in the vicinity of the cutting positions (d ₁ , d ₂ ) of the top crop and the bottom crop. A process is performed to check whether the product thickness tolerance is within the range. As shown in the hatched portion of the actual thickness value illustrated in FIG. 3, when the portion b including the product dimension and the product surplus length includes a portion outside the range of the product thickness tolerance ( In step S3, No), the measurement control process proceeds to step S4. On the other hand, if the part b including the product dimension and the product surplus length does not have a part where the thickness is outside the range of the product thickness tolerance (step S3, Yes), it is determined that there is no defective thickness. The control process proceeds to step S5.

In the process of step S4, a process of correcting the cutting amount of the top crop and the cutting amount of the bottom crop is performed based on the result of step S3. FIG. 4 is a diagram for explaining a method of correcting the cutting amount at this time. As illustrated in FIG. 4, the shear calculator 19 has a product dimension and a product surplus length so that a portion b including the product size and the product surplus length does not have a portion where the plate thickness is out of the product thickness tolerance range. The position of securing the portion b including the above is changed to correct the distribution of the top side surplus length c ₁ ′ and the bottom side surplus length c ₂ ′. At this time, the distribution is corrected so that c ₁ + c ₂ and c ₁ '+ c ₂ ' are equal. Accordingly, the cutting amount of the top crop is corrected as a ₁ + c ₁ ′, and the cutting amount of the bottom crop is corrected as a ₂ + c ₂ ′. The top crop cutting position d ₁ ′ and the bottom crop cutting position d ₂ ′ are corrected based on the corrected top crop cutting amount and bottom crop cutting amount. Thereby, the process of step S4 is completed, and the measurement control process proceeds to the process of step S5.

  In the process of step S5, the cutting amount of the top crop and the bottom crop calculated by the shear calculator 19 in step S2 or, if corrected in step S4, the cut amount of the top crop and the bottom crop after correction is supplied to the rough cutting device 16. The rough cutting device 16 performs a process of cutting the thick steel plate. Thereby, the process of step S5 is completed and the measurement control process proceeds to the process of step S6.

  In the process of step S <b> 6, the shear calculator 19 acquires the cold plate thickness actual value from the cold plate thickness meter 18. Thereby, the process of step S6 is completed and the measurement control process proceeds to the process of step S7. In addition, since the thick steel plate whose thickness is measured by the cold thickness meter 18 is after being cooled by the cooling floor 15, the actual cold plate thickness obtained in step S6 is influenced by thermal expansion. There is little error with the dimension when it becomes a product than the plate thickness actual value measured by the hot plate thickness meter 13. Further, the thick steel plate is cut by the rough cutting device 16 and the side crop cutting device 17 and has a size obtained by adding the product extra length to the product dimensions.

In the process of step S7, the shear calculator 19 performs a process of calculating the cutting amount of the product extra length. FIG. 5 is a diagram for explaining a cutting amount calculation method at this time. As shown in FIG. 5, the shear calculator 19 secures a product portion e of product dimensions, and distributes the product surplus length as a top product surplus length f ₁ and a bottom product surplus length f ₂ . Thus, the shear calculator 19 calculates the cutting amount of the top product surplus length as f ₁ and the cutting amount of the bottom product surplus length as f ₂ . Incidentally, the cutting amount and the cutting amount of bottom product excess length of the top side products extra length top side finishing cutting position g ₁ and bottom finishing cutting position g ₂ are determined. Thereby, the process of step S7 is completed and the measurement control process proceeds to the process of step S8.

In the process of step S8, the shear calculator 19 is based on the product plate thickness tolerance indicating the allowable plate thickness range of the product acquired in advance and the cold plate thickness actual value acquired in step S6, as in step S3. To determine the tolerance of the top and bottom. That is, for the product portion e secured in step S7, more specifically, the actual cold plate thickness value is within the range of the product plate thickness tolerance in the vicinity of the top side and bottom side finish cutting positions (g ₁ , g ₂ ). The process which confirms whether it is is performed. With respect to the actual cold plate thickness illustrated in FIG. 5, as shown in the hatched portion, when the product portion e has a portion where the plate thickness is outside the range of the product plate thickness tolerance (step S8). , No), the measurement control process proceeds to step S9. On the other hand, if the product portion e does not have a portion where the plate thickness is out of the range of the product plate thickness tolerance (step S8, Yes), it is determined that there is no defective plate thickness, and the measurement control process proceeds to the process of step S10.

In the process of step S9, based on the result of step S8, a process of correcting the cutting amount of the top product surplus length and the cutting amount of the bottom product surplus length is performed. FIG. 6 is a diagram for explaining a method of correcting the cutting amount at this time. As illustrated in FIG. 6, the shear calculator 19 changes the position for securing the product portion e of the product dimensions so that the product portion e does not have a portion where the plate thickness is out of the range of the product plate thickness tolerance. The distribution of the top product surplus length f ₁ ′ and the bottom product surplus length f ₂ ′ is corrected. At this time, the distribution is corrected so that f ₁ + f ₂ and f ₁ '+ f ₂ ' are equal. In this way, the shear calculator 19 corrects the cutting amount of the top product surplus length as f ₁ ′ and the cutting amount of the bottom product surplus length as f ₂ ′. It should be noted that the top-side finished cutting position g ₁ ′ and the bottom-side finished cutting position g ₂ ′ are corrected according to the corrected cut amount of the top product surplus length and the cut amount of the bottom product surplus length. Thereby, the process of step S9 is completed, and the measurement control process proceeds to the process of step S10.

In the process of step S10, the cutting amount of the top product surplus length and the bottom product surplus length calculated by the shear calculator 19 in step S7, or the top product surplus length and the bottom side after correction when corrected in step S9. The cutting amount of the product excess length is notified to the finishing cutting device 20, and the finishing cutting device 20 cuts the thick steel plate at the top side and bottom side finishing cutting positions (g ₁ ', g ₂ ') to finish the product dimensions. Perform processing. Thereby, the process of step S10 is completed and a series of measuring control processes are complete | finished.

  As is apparent from the above description, in the measurement control process according to an embodiment of the present invention, the thickness of the product portion is within the range of the product thickness tolerance in consideration of the defective thickness portion at the end of the thick steel plate. So that the excess length of the top and bottom of the thick steel plate is distributed. Therefore, according to such a measurement control process, it is possible to suppress the production of a thick steel plate having a poor thickness.

(Second Embodiment)
The quality of the steel sheet also varies depending on the steel sheet temperature. The steel plate temperature is a factor that determines the material such as strength and toughness of the steel plate, and items such as adjustment temperature, rolling completion temperature, cooling start temperature, and cooling stop temperature are managed. With such steel plate temperature, if the cooling is excessive or insufficient, the steel plate becomes insufficient in strength or excessive in strength, resulting in material defects. In particular, the top part and the bottom part of the steel sheet are likely to have non-uniform temperatures due to insufficient heating of the base material, and material defects are likely to occur. Therefore, in the second embodiment, in addition to the plate thickness failure described in the first embodiment, the measurement control processing of the plate steel plate that can suppress the production of a plate steel having a material failure due to a temperature failure is possible. To do.

  FIG. 7 illustrates an apparatus configuration of the measuring control system according to the present embodiment. This measuring control system 100 differs from the measuring control system 1 of FIG. 1 only in that it includes a thermometer 131 and a water cooling facility 151. The thermometer 131 measures the temperature of the hot-rolled steel material and notifies the rolling calculator 14 of the actual temperature value. The thermometer 131 is installed in front of the hot plate thickness gauge 13 and before and after the water cooling equipment 151. The water cooling equipment 151 cools the hot-rolled steel material with water, and the cooling floor 15 cools the hot-rolled steel material with air to obtain a thick steel plate.

  In the measurement control system 100 having the above-described configuration, the shear calculator 19 executes the measurement control process shown below to take into consideration the defective portion of the thickness of the thick steel plate and the defective portion of the material due to the temperature failure. The cutting amount is determined by allocating the extra length of the top and bottom of the thick steel plate.

  Next, with reference to FIG. 8, the operation of the shear calculator 19 when executing the measuring control process of the second embodiment will be described. The flowchart shown in FIG. 8 starts at the timing when an instruction to execute the measurement control process is input to the shear calculator 19, and the measurement control process proceeds to the process of step S101.

  In the process of step S <b> 101, the shear calculator 19 obtains a plate thickness actual value (hot plate thickness actual value) and a temperature actual value from the rolling calculator 14. Thereby, the process of step S101 is completed, and the measurement control process proceeds to the process of step S102.

In the process of step S102, the shear calculator 19 first performs a process of calculating the cutting amount of the top crop and the cutting amount of the bottom crop. FIG. 3 and FIG. 9 described above are diagrams for explaining the method of calculating the cutting amount at this time. In addition, FIG. 3 illustrates the plate thickness actual value, and FIG. 9 illustrates the temperature actual value described later. Illustrated. As shown in FIG. 3 and FIG. 9, the shear calculator 19 first adjusts the perpendicularity of the thick steel plate except for the portions (a ₁ , a ₂ ) below the product width of the thick steel plate, as in step S2. after, kerf required product dimensions and finishing cutting device 20 (product surplus length) and to ensure partial b including the unnecessary portions (extra length), the top side excess length c ₁ and the bottom side remains allocating the extra length _{c 2.} Therefore, the shear calculator 19 calculates the cutting amount of the top crop as a ₁ + c ₁ and the cutting amount of the bottom crop as a ₂ + c ₂ . Incidentally, the cutting amount of the cutting amount and bottom crop top crop top crop cutting position d ₁ and bottom crop cutting position d ₂ are determined. Thereby, the process of step S102 is completed, and the measurement control process proceeds to the process of step S103.

In the process of step S103, the shear calculator 19 obtains the product plate thickness tolerance indicating the allowable plate thickness range of the product acquired in advance and the steel plate temperature tolerance indicating the allowable range of the steel plate temperature, and the plate thickness record acquired in step S101. Based on the value and the actual temperature value, the tolerance determination of the top portion and the bottom portion is performed. That is, for the portion b including the product dimensions and the product surplus secured in step S102, more specifically, the sheet thickness actual value is near the cutting positions (d ₁ , d ₂ ) of the top crop and the bottom crop. A process is performed to check whether the product thickness tolerance is within the range. At the same time, a process for confirming whether the actual temperature value is within the range of the steel plate temperature tolerance is performed. In addition, about each of the temperature actual value in several places, steel plate temperature tolerance is acquired and contrasted.

  As shown in the hatched portion of the actual thickness value illustrated in FIG. 3, when the portion b including the product dimension and the product surplus length includes a portion outside the range of the product thickness tolerance ( In step S103, No), the measurement control process proceeds to step S104. On the other hand, if the portion b including the product dimensions and the product surplus length does not have a portion where the plate thickness is outside the range of the product plate thickness tolerance, there is no defective plate thickness portion.

  Similarly, with respect to the actual temperature values illustrated in FIG. 9, as shown in the hatched portion, when the portion b including the product dimensions and the product surplus length includes a portion outside the range of the steel plate temperature tolerance, (Step S103, No), the measurement control process proceeds to the process of Step S104. On the other hand, if there is no portion where the temperature deviates from the range of the steel plate temperature tolerance in the portion b including the product dimensions and the product surplus length, there is no temperature defective portion (material defective portion due to temperature failure). When there is neither a board thickness fault location nor a temperature fault location (step S103, Yes), the measurement control process proceeds to the process of step S105.

In the processing of step S104, processing for correcting the cutting amount of the top crop and the cutting amount of the bottom crop is performed based on the result of step S103. 4 and 10 described above are diagrams for explaining a method of correcting the cutting amount at this time. When the part b including the product dimension and the product surplus length includes a part outside the range of the product thickness tolerance, the shear calculator 19 calculates the product dimension and the product surplus length as illustrated in FIG. The position where the part b including the product dimensions and the product surplus length is secured is changed so that the part b including the product thickness does not deviate from the product thickness tolerance range, and the top surplus length c ₁ Correct the distribution between 'and the bottom surplus length c ₂ '. At this time, the distribution is corrected so that c ₁ + c ₂ and c ₁ '+ c ₂ ' are equal. Accordingly, the cutting amount of the top crop is corrected as a ₁ + c ₁ ′, and the cutting amount of the bottom crop is corrected as a ₂ + c ₂ ′. The top crop cutting position d ₁ ′ and the bottom crop cutting position d ₂ ′ are corrected based on the corrected top crop cutting amount and bottom crop cutting amount.

Similarly, when the part b including the product dimension and the product surplus length includes a part out of the range of the steel plate temperature tolerance, as illustrated in FIG. 10, the shear calculator 19 performs the product dimension and product surplus length. The position of securing the portion b including the product dimensions and the product surplus length is changed so that the portion b including the product does not have a portion where the temperature is out of the range of the steel plate temperature tolerance, and the top surplus length c ₁ is changed. The distribution between '' and the bottom surplus length c ₂ '' is corrected. At this time, the distribution is corrected so that c ₁ + c ₂ and c ₁ ″ + c ₂ ″ are equal. Therefore, the cutting amount of the top crop is corrected as a ₁ + c ₁ ″, and the cutting amount of the bottom crop is corrected as a ₂ + c ₂ ″. The top crop cutting position d ₁ ″ and the bottom crop cutting position d ₂ ″ are corrected based on the corrected top crop cutting amount and bottom crop cutting amount.

  Through the above processing, the cutting amount of the top crop and the cutting amount of the bottom crop are corrected so that the portion where both the thickness and the temperature are outside the tolerance range is not included in the portion b including the product dimension and the product extra length. To do. Thereby, the process of step S104 is completed, and the measurement control process proceeds to the process of step S105.

  In the process of step S105, similarly to the process of step S5, the cutting amount of the top crop and the bottom crop calculated by the shear calculator 19 in step S2 or, if corrected in step S104, the corrected top crop and bottom crop. The cutting amount is notified to the rough cutting device 16, and the rough cutting device 16 performs a process of cutting the thick steel plate. Thereby, the process of step S105 is completed, and the measurement control process proceeds to the process of step S106.

  In the process of step S106, as in the process of step S6, the shear calculator 19 acquires the cold plate thickness actual value from the cold plate thickness meter 18. Thereby, the process of step S106 is completed and the measurement control process proceeds to the process of step S107. In addition, since the thick steel plate whose thickness is measured by the cold thickness meter 18 is after being cooled by the cooling floor 15, the actual cold plate thickness value obtained in step S106 is influenced by thermal expansion. There is little error with the dimension when it becomes a product than the plate thickness actual value measured by the hot plate thickness meter 13. Further, the thick steel plate is cut by the rough cutting device 16 and the side crop cutting device 17 and has a size obtained by adding the product extra length to the product dimensions.

In the process of step S107, as in the process of step S7, the shear calculator 19 performs a process of calculating the cutting amount of the product extra length. As shown in FIG. 5 described above, the shearing machine 19, to ensure product portion e of the product dimensions, allocating product excess length as the top side product excess length f ₁ and the bottom side product excess length f _2. Thus, the shear calculator 19 calculates the cutting amount of the top product surplus length as f ₁ and the cutting amount of the bottom product surplus length as f ₂ . Incidentally, the cutting amount and the cutting amount of bottom product excess length of the top side products extra length top side finishing cutting position g ₁ and bottom finishing cutting position g ₂ are determined. Thereby, the process of step S107 is completed, and the measurement control process proceeds to the process of step S108.

In the process of step S108, as in steps S3 and S8, the shear calculator 19 obtains the product thickness tolerance indicating the allowable thickness range of the product acquired in advance, and the cold sheet thickness result acquired in step S106. Based on the value, tolerance determination of the top part and the bottom part is performed. That is, for the product portion e secured in step S107, more specifically, the actual cold plate thickness value is within the range of the product plate thickness tolerance in the vicinity of the top side and bottom side finish cutting positions (g ₁ , g ₂ ). The process which confirms whether it is is performed. As for the actual cold plate thickness value illustrated in FIG. 5, as shown in the hatched portion, when the product portion e has a portion where the plate thickness is outside the range of the product plate thickness tolerance (step S108). , No), the measurement control process proceeds to step S109. On the other hand, if the product portion e does not have a portion where the plate thickness is outside the range of the product plate thickness tolerance (step S108, Yes), the measurement control processing proceeds to the processing of step S110, assuming that there is no defective plate thickness.

In the process of step S109, similarly to the process of step S9, based on the result of step S108, a process of correcting the cutting amount of the top product surplus length and the cutting amount of the bottom product surplus length is performed. As illustrated in FIG. 6, the shear calculator 19 changes the position for securing the product portion e of the product dimensions so that the product portion e does not have a portion where the plate thickness is out of the range of the product plate thickness tolerance. The distribution of the top product surplus length f ₁ ′ and the bottom product surplus length f ₂ ′ is corrected. At this time, the distribution is corrected so that f ₁ + f ₂ and f ₁ '+ f ₂ ' are equal. In this way, the shear calculator 19 corrects the cutting amount of the top product surplus length as f ₁ ′ and the cutting amount of the bottom product surplus length as f ₂ ′. It should be noted that the top-side finished cutting position g ₁ ′ and the bottom-side finished cutting position g ₂ ′ are corrected according to the corrected cut amount of the top product surplus length and the cut amount of the bottom product surplus length. Thereby, the process of step S109 is completed, and the measurement control process proceeds to the process of step S110.

In the process of step S110, the cutting amount of the top product surplus length and the bottom product surplus length calculated by the shear calculator 19 in step S107, or the top product surplus length and the bottom side after correction when corrected in step S109. The cutting amount of the product excess length is notified to the finishing cutting device 20, and the finishing cutting device 20 cuts the thick steel plate at the top side and bottom side finishing cutting positions (g ₁ ', g ₂ ') to finish the product dimensions. Perform processing. Thereby, the process of step S110 is completed and a series of measuring control processes are complete | finished.

  As is apparent from the above description, in the measurement control process of the second embodiment of the present invention, the thickness of the product portion is determined to be within the tolerance of the product thickness in consideration of the defective thickness portion at the end of the thick steel plate. In order not to deviate from the range, the extra length of the top and bottom of the thick steel plate is distributed and cut. In addition, considering the material defect location due to the temperature defect, the length of the top and bottom of the thick steel plate is distributed and cut so that the temperature of the product portion does not fall outside the range of the steel plate temperature tolerance. Therefore, according to such a measurement control process, it is possible to suppress the production of a thick steel plate having a defective thickness or a poor material.

  Although the embodiment to which the invention made by the present inventor is applied has been described above, the present invention is not limited by the description and the drawings that form a part of the disclosure of the present invention according to this embodiment. That is, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1,100 Measuring control system 11 Rolling machine 13 Hot plate thickness meter 14 Rolling calculator 16 Rough cutting device 17 Side crop cutting device 18 Cold plate thickness meter 19 Shear calculator 20 Finishing cutting device

Claims (6)

A method for controlling the measurement of a thick steel plate to cut the extra length of the top and bottom of the thick steel plate to finish the product dimensions,
Obtaining a plate thickness actual value of the thick steel plate after rolling;
Determining the distribution of the surplus length of the top and bottom of the thick steel plate, based on the actual thickness value and product thickness tolerance;
A method for controlling the measurement of a thick steel plate, comprising: Obtaining a temperature actual value of the thick steel plate after rolling;
Based on the actual temperature value and the steel plate temperature tolerance, determining the distribution of the extra length of the top and bottom of the thick steel plate;
The method for controlling the measurement of a thick steel plate according to claim 1, comprising: The plate thickness actual value is a hot plate thickness actual value measured by a hot plate thickness meter,
Based on the determined distribution of the extra length of the top and bottom of the thick steel plate, obtain the actual cold plate thickness measured by the cold thickness meter after cutting the top and bottom of the thick steel plate And steps to
Determining a product surplus length based on the cold sheet thickness actual value and the product sheet thickness tolerance;
The method for controlling the measurement of a thick steel plate according to claim 1, comprising: A thick steel plate measuring control device for cutting the extra length of the top and bottom of a thick steel plate to finish the product dimensions,
Means for obtaining a plate thickness actual value of the thick steel plate after rolling;
Based on the sheet thickness actual value and the product sheet thickness tolerance, means for determining the distribution of the extra length of the top and bottom of the plate steel sheet,
A measuring apparatus for measuring a thick steel plate. Means for obtaining the actual temperature value of the thick steel plate after rolling;
Based on the actual temperature value and the steel plate temperature tolerance, means for determining the distribution of the extra length of the top and bottom of the thick steel plate;
The measuring control apparatus of the thick steel plate of Claim 4 characterized by the above-mentioned. The plate thickness actual value is a hot plate thickness actual value measured by a hot plate thickness meter,
Based on the determined distribution of the extra length of the top and bottom of the thick steel plate, obtain the actual cold plate thickness measured by the cold thickness meter after cutting the top and bottom of the thick steel plate Means to
Means for determining a product surplus length based on the cold sheet thickness actual value and the product sheet thickness tolerance;
The measuring control apparatus of the thick steel plate of Claim 4 characterized by the above-mentioned.

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