JP2005207923A - Sheet thickness determination method and manufacturing method for sheet material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent defects in stack thickness from arising with respect to sheet materials such as magnetic steel sheets layered and used by a consumer. <P>SOLUTION: At a sheet thickness measurement data input part 11, actual measurement values in the longitudinal direction of a steel sheet are inputted, sheet thickness deviations Δt from a sheet thickness target value t0 are calculated by a sheet thickness deviation calculation part 12, whether a product sheet thickness tolerance Tt is exceeded is determined by a sheet thickness tolerance determination part 13, a stack thickness deviation accumulation part 14 simultaneously accumulates the thickness deviations Δt to the number n of layers layered and used by the consumer, and whether this accumulated value exceeds an allowable stack thickness deviation AS is determined by a stack thickness deviation determination part 15. A sheet thickness pass-fail determination part 16 makes determination by together putting results obtained by the determination parts 13 and 15, thereby preventing stack thickness defects due to the accumulation of the thickness deviations Δt in layered use, the defects being indeterminable by only a simple product sheet thickness tolerance Tt. The determination by the determination part 13 may be omitted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plate thickness determination method and a manufacturing method of a plate material, and more particularly, to a plate thickness determination method and a manufacturing method for a plate material such as a metal plate used by laminating electromagnetic steel plates.

  In the production of a metal plate such as a steel plate, the thickness of the metal plate is a very basic and important item for quality assurance. Therefore, for example, in a steel sheet production line, generally, a pass / fail judgment is made as to whether or not the steel sheet thickness is within a certain allowable range (tolerance) by continuously measuring the steel sheet thickness with a thickness gauge using X-rays or γ rays. Only the accepted part is shipped as a product.

  In electrical equipment such as a motor, a transformer, and a compressor, generally, electromagnetic steel sheets are punched into a desired shape, and the punched materials are stacked and used. When steel plates are used in this way, even if the deviation of the thickness of each punched material is small, if this is laminated, it will be a large deviation, so that the thickness after lamination will not vary. Thickness accuracy is required.

  Conventionally, various methods have been studied as methods for improving the plate thickness accuracy of a steel plate. In particular, in an electromagnetic steel sheet that requires strict sheet thickness accuracy as described above, for example, in Patent Document 1, the distribution of inclusions contained in the steel has a large effect on the sheet thickness accuracy during cold rolling. As described above, a technique for defining the amount of inclusions in steel and further defining the casting conditions is described.

In the manufacture of electromagnetic steel sheets, not only the technique described in Patent Document 1, but various measures for improving the plate thickness accuracy are taken, and pass / fail judgment of the plate thickness is managed with strict plate thickness tolerances. However, even though the sheet thickness was shipped as acceptable within the tolerance, when the sheet was punched and stacked by the customer, the thickness (stacked thickness) in the stacked state sometimes deviated from the management range.
JP-A-9-256118

As a result of intensive studies on this cause, the present inventors have obtained the following knowledge.
FIG. 7 is a diagram schematically showing the thickness deviation in the longitudinal direction of the steel plate. In this figure, the target plate thickness is 0.5 mm, and the tolerance is ± 10 μm. In the drawing, in the area A, the thickness deviation is within the tolerance, and the product is shipped after the acceptance is determined. On the other hand, in the region B, the plate thickness deviation is out of the tolerance, and the determination is rejected. Such a portion is often found especially in the unsteady portion at the front and rear ends of the steel plate and is discarded before product shipment. Here, in the area C, the plate thickness deviation is within the tolerance, so that the product is shipped after being determined to pass as in the case of the area A. However, the thickness of the C region is generally undulating, and most of the average thickness is greater than the target thickness. Therefore, when a large number of plates are punched out from this region C at the customer, and this is continuously laminated, even if the punching material is a small deviation within the tolerance, a large deviation will occur when laminated. It has been found that there are cases in which the control range of the stack thickness (allowable deviation of the stack thickness) deviates (hereinafter referred to as stack thickness failure).

  Such waviness of the plate thickness is considered to occur mainly during acceleration / deceleration during cold rolling, and of course it is important to reduce the waviness of the plate thickness. It is also important that the undulations that have occurred are determined to be unacceptable in the product pass / fail determination and not shipped to the customer.

  Accordingly, an object of the present invention is to provide a plate thickness determination method and a manufacturing method that can reliably prevent the occurrence of poor stacking thickness of plate materials such as electromagnetic steel plates used by being laminated by customers. .

  FIG. 1 is a diagram illustrating an example of a method of punching and laminating steel sheets at a customer. As described above, a steel plate customer who manufactures electric equipment such as a motor, a transformer, and a compressor continuously punches a plate having a desired shape from a slit steel plate coil (FIG. 1 (a)). Then, they are laminated to form a core (FIG. 1B). At this time, for example, it is assumed that the allowable deviation of the stack thickness of 200 sheets is ± 0.5 mm. That is, if all 200 sheets have a uniform thickness, the allowable thickness deviation per sheet is 2.5 μm. Then, even if, for example, the thickness tolerance as a steel plate requested by a customer is ± 10 μm, and the measured thickness deviation is within the tolerance, the average thickness of the steel plates used by being laminated at the same time is If the deviation from the target value exceeds ± 2.5 μm, it will be out of the management range of the product thickness, resulting in poor product thickness.

  In other words, when performing pass / fail judgment of sheet thickness, whether or not it falls within the management range of thickness when used by customers, rather than performing pass / fail judgment only by the thickness tolerance required for the steel sheet It is necessary to judge. For that purpose, the sheet thickness after punching is accumulated for a predetermined range in the longitudinal direction of the steel sheet that is continuously laminated and used by a customer at the same time, and pass / fail judgment is thereby performed.

The present invention has been made based on such findings, and provides the following (1) to (4).
(1) A method for determining the thickness of a plate material to be used by being laminated, wherein the deviation from the plate thickness target value of the plate thickness measured in the longitudinal direction of the plate material is simultaneously accumulated within a range in which lamination is used, and a cumulative value is obtained. Determination of pass / fail of the plate thickness is performed based on the accumulated value.

  (2) A method for determining the plate thickness of a plate used for stacking, wherein a deviation from a plate thickness target value in the longitudinal direction of the plate is measured at a pitch at which the plate is punched for stacking and the number of stacked plates The thickness deviation is accumulated to obtain a cumulative value, and a pass / fail judgment of the sheet thickness is performed by comparing the cumulative value with an allowable deviation in thickness when laminated.

  (3) It is a manufacturing method of the board | plate material used by laminating | stacking, Comprising: The process of rolling the said board | plate material, The process of measuring board thickness in the longitudinal direction of the said board | plate material, The board thickness of the board thickness measured in the board | plate material longitudinal direction Deviation from the target value is accumulated within the range where the layers are used at the same time to obtain a cumulative value, and the pass / fail judgment of the sheet thickness is performed based on the cumulative value, and the reject portion of the plate material based on the pass / fail judgment And a step of performing screening.

  (4) A method of manufacturing a plate material to be used by being laminated, the step of rolling the plate material, the step of measuring the plate thickness in the longitudinal direction of the plate material, and the pitch at which the plate material is punched for lamination Measure the deviation of the thickness from the target thickness value in the longitudinal direction and accumulate the thickness deviation for the number of sheets to be stacked to obtain a cumulative value, and calculate the cumulative value and the allowable thickness deviation when stacked. A step of performing pass / fail judgment of the plate thickness by comparison, and a step of selecting rejected portions of the plate material based on the pass / fail judgment.

  According to the above-mentioned present invention, before the shipment of the plate material, since an accurate acceptance / rejection determination in consideration of an allowable deviation of the stacking thickness when used by the customer is performed, the occurrence of a stacking failure in the customer is generated. It becomes possible to prevent surely.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 2 is a conceptual diagram illustrating an example of a configuration and a processing process of an information processing apparatus in which a plate thickness determination method according to an embodiment of the present invention is implemented, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a flowchart showing an example of a plate material manufacturing method according to an embodiment of the present invention.

In the present embodiment, as an example of a plate thickness determination method of a plate material, a case where it is applied to a plate thickness determination method of a steel plate will be described as an example.
In the present embodiment, an information processing apparatus that performs the plate thickness measurement method includes, as an example, an information processing unit 10 and a storage device 20 in which a database that stores various types of information described below is constructed.

  The storage device 20 includes a plate thickness measurement data file 21 in which plate thickness measurement data to be determined by the information processing apparatus is stored, a plate thickness determination data file 22 in which a plate thickness determination result is stored, and a plate Information such as a target thickness value t0, a product plate thickness tolerance Tt, a punching pitch P, a stacking number n, and a stacking thickness tolerance AS is stored.

  The information processing unit 10 includes a plate thickness measurement data input unit 11 that reads plate thickness data from the plate thickness measurement data file 21, a plate thickness deviation calculation unit 12 that calculates a plate thickness deviation Δt based on the plate thickness target value t0, Based on information such as a plate thickness tolerance determination unit 13 that determines whether the plate thickness deviation Δt is within the range of the product plate thickness tolerance Tt, the plate thickness deviation Δt, the punching pitch P, the number n of stacked sheets, and the like, The accumulated thickness deviation accumulating section 14, the accumulated thickness deviation determining section 15 for discriminating the accumulated result based on the accumulated thickness deviation AS, the final thickness based on the results of the plate thickness tolerance determining section 13 and the accumulated thickness deviation determining section 15. Board thickness acceptance / rejection determination unit 16 that performs a pass / fail determination and a control unit (not shown) that controls the whole.

  Note that the functions of the information processing unit 10 can be realized by, for example, software executed by a processor in a computer system, further dedicated hardware, firmware, or the like, and the storage device 20 is mainly configured by a semiconductor memory or the like. This can be realized by a storage device, an external storage device, or the like.

  In the plate thickness determination processing in such an information processing apparatus, first, in the plate thickness measurement data input unit 11, the plate thickness in the longitudinal direction of the steel plate is continuously determined by a plate thickness meter provided in the steel plate production line. From the plate thickness measurement data file 21 in which the measurement results are recorded, the measured value of the plate thickness is continuously read in the longitudinal direction. In this case, as a thickness gauge, a thickness gauge using a normal X-ray or γ-ray can be used.

  In this example, the case of reading the plate thickness data from the plate thickness measurement data file 21 will be described, but the plate thickness in the longitudinal direction of the steel plate was continuously measured by a plate thickness meter provided in the steel plate production line. It is also possible to process the results in real time. Moreover, you may make it input plate | board thickness data online via an information network from the process computer which manages a rolling process.

  Further, the plate thickness deviation calculation unit 12 gives the measured value t of the plate thickness at the measurement position L in the longitudinal direction input (measured) in the plate thickness measurement data input unit 11 and the database (storage device 20). The thickness deviation Δt of the steel sheet is calculated from the target thickness value t0 of the steel sheet.

  Next, in the plate thickness tolerance determining unit 13, the plate thickness t of the steel plate is calculated from the plate thickness deviation Δt of the steel plate calculated in the plate thickness deviation calculating unit 12 and the plate thickness tolerance Tt of the steel plate given from the database. Is determined to be within the thickness tolerance.

  On the other hand, in the accumulated thickness deviation accumulating unit 14, the punching pitch when punching the steel sheet at the customer, and the number of stacked layers when using the punched material by stacking are given from the database, The plate thickness deviation Δt calculated by the plate thickness deviation calculation unit 12 is accumulated. For example, if the punching pitch is P and the number of stacked layers is n, the plate thickness deviation Δt is sampled for each punching pitch P, and this is accumulated for n. In order to further increase the measurement accuracy, the sampling pitch may be shortened, and a plurality of data (data at a plurality of locations in one punched material) may be averaged to obtain a thickness deviation for each punched material.

  Further, in the product thickness deviation determination unit 15, the cumulative value of the plate thickness deviation Δt calculated in the product thickness deviation cumulative unit 14, that is, the deviation from the target value of the product thickness when stacked by the customer, and the data given from the database It is determined from the product thickness allowable deviation AS at the consumer of the product whether or not the product falls within the product thickness management value at the customer when the steel sheet is laminated at the consumer.

  Then, in the sheet thickness acceptance / rejection determination unit 16, from the determination result of the product sheet thickness tolerance Tt in the sheet thickness tolerance determination unit 13 and the determination result of the product thickness management value in the product thickness deviation determination unit 15, the thickness of the steel sheet is determined. Pass / fail judgment is performed.

  In addition, even if the plate thickness deviation is not within the tolerance, the plate thickness tolerance determination unit 13 does not perform the plate thickness tolerance determination for products and consumers that the stack thickness only needs to be within the control value. The plate thickness pass / fail determination unit 16 may perform pass / fail determination based on only the thickness management value of the thickness deviation determination unit 15.

Next, a series of determination operations of the information processing unit 10 will be described in detail with reference to FIG.
First, the plate thickness t at each part (position L in the longitudinal direction from the coil tip) of the steel plate having the full length L0 is actually measured by a rolling mill for the steel plate and recorded in the plate thickness determination data file 22 (step 101).

  The information processing unit 10 first initializes each variable such as the reading position L of the plate thickness t, the integrated value S of the plate thickness deviation Δt, the integrated (number of sheets) counter N, and the pitch position determination variable Lp ( Step 102). Note that Lp is initialized with an offset of P / 2 so that the determination is made at the center position of the punched material.

  Then, the reading position resolution ΔL is added to the reading position L and the like, and the reading position is moved in the longitudinal direction (step 103), up to the coil tail end (step 104), and measured at the L position sequentially. The plate thickness t is read (step 105), and a plate thickness deviation Δt that is a difference from the plate thickness target value t0 is calculated (step 106).

  First, it is determined whether or not the plate thickness deviation Δt is within the product plate thickness tolerance Tt (step 107). If so, the pitch position determination variable Lp further matches the punching pitch P. That is, it is determined whether or not the current position L is the center of the punching planned position of each punching material, and step 103 and subsequent steps are repeated until they match (step 108).

  If the pitch position determination variable Lp matches the punching pitch P in step 108, first, the plate thickness deviation Δt is added to the integrated value S (step 109), and the counter N is incremented and prepared for the next determination. After the pitch position determination variable Lp is initialized (step 110), step 103 and subsequent steps are repeated until the counter N reaches the number n of stacked layers (step 111).

  In step 111, if the counter N reaches the number n of stacked layers, whether or not the value of the integrated value S falls within the stacking thickness allowable deviation AS, that is, the stacked thickness of the n punched materials used for stacking simultaneously. Then, it is determined whether or not the stacking thickness is defective (step 112), and if it is within the range, the current position L and information indicating that the stacking can be used up to the position L are output to the plate thickness determination data file 22. (Step 113), the counter N and the integrated value S are initialized (Step 114), and Step 103 and subsequent steps are repeated.

  If the integrated value S does not fall within the allowable stacking thickness deviation AS in step 112, it is determined that there is a stacking failure, and the fact of the stacking failure and information on the position L at that time are obtained as the plate thickness determination data file 22 (Step 117), the counter N, the integrated value S, the pitch position determination variable Lp, etc. are initialized as appropriate (step 118), and the process returns to step 103.

If it is determined in step 107 that the plate thickness deviation Δt has deviated from the product plate thickness tolerance Tt, the fact of the error and the information on the position L are stored as a plate thickness tolerance error in the plate thickness determination data file. 22 (step 115), the counter N, the integrated value S, the pitch position determination variable Lp, etc. are initialized as appropriate (step 116), and the process returns to step 103.
That is, when the thickness deviation Δt deviates from the preset product thickness tolerance Tt at any measurement location in the longitudinal direction of the steel plate (in the case of “NO” in step 107), the stacking range including the measurement location The region from the starting position to the measurement location is rejected, and a new stacking range is started immediately after the measurement location.

It should be noted that even if the thickness deviation Δt is not within the product thickness tolerance Tt, the steps 107, 115, and 116 are omitted for products and customers whose product thickness only needs to be within the control value. Thus, the thickness tolerance determination (process of the plate thickness tolerance determination unit 13) is not performed, and the other processing steps are executed, so that the plate thickness acceptance / rejection determination (stack thickness deviation determination unit 15, The processing of the board thickness acceptance / rejection determination unit 16 may be performed.
Further, when the thickness deviation Δt deviates from a preset product thickness tolerance Tt at any measurement location in the longitudinal direction of the steel plate (in the case of “NO” in step 107), the stacking range including the measurement location All may be rejected.
When starting the determination from the next stacking range with all the stacking ranges including the measurement point being rejected, in step 116, Lp is initialized to 0 and the rest of the current stacking range is skipped. A process of initializing L at the start position of the next stacking range (specifically, adding the length of the remaining portion from the measurement location in the current stacking range to L) may be added.

In the case of determining whether or not the plate thickness is acceptable based only on the thickness management value, it can be expected that the portion discarded as an error in the determination of the plate thickness tolerance in the middle of the stacking number range is reduced and the yield is improved.
By passing through the above processing steps, it is possible to determine whether or not the product thickness of the steel sheet is acceptable in consideration of the lamination usage conditions in the consumer.

  Next, with reference to FIG. 4, the manufacturing method of the steel plate including the above thickness determination acceptance is demonstrated. First, a steel sheet having a predetermined thickness is formed by a rolling process (step 100). Then, the above-mentioned plate thickness measurement (step 101) and plate thickness acceptance / rejection determination (steps 102 to 118) are performed, and the rejected portions are cut off to make only the accepted portion of the steel plate (step 119). In this way, by shipping the product only in the acceptable part, there is no problem when the customer uses the laminate.

  In addition, the information such as the plate thickness determination data file 22 is attached to the determined steel plate and shipped, and the customer side cuts off the rejected portion from the steel plate as necessary based on this information. You may make it perform work etc. The information provision of the plate thickness determination data file 22 may be performed online via an information network.

  In the above description, a case has been described in which the determination is performed assuming one punching start position by initializing at P / 2 using one pitch position determination variable Lp, but is not limited thereto. A plurality of pitch position determination variables Lp are set, each is initialized to P / 2 and values before and after that, and the thickness error determination in step 108 and the like is performed for each pitch position determination variable Lp. The thickness error in each case where the punching start position is shifted in the coil longitudinal direction can be determined, and the reliability of the determination is improved.

  The product sheet thickness (t0) of 0.500 mm and the product sheet thickness tolerance (Tt) of ± 10 μm were subjected to pass / fail judgment as to the product thickness according to the steel plate thickness judgment method of the present invention. It should be noted that the usage conditions of this product for customers are as follows: the thickness of the plate is 0.5 mm, the punching pitch (P) is 150 mm, the number of stacked layers (n) is 200, and the allowable stacking thickness is 100 ± 0.00 mm. 5 mm. In addition, the thickness deviation calculation is a plate thickness deviation sampling pitch (P) of 150 mm, a plate thickness deviation calculation data number (n) of 200, and a stack thickness deviation determination range (AS) of ± 0.5 mm.

  FIG. 5 is a chart in which the plate thickness is measured with a γ-ray plate thickness meter in the longitudinal direction of the coil, where (a) is the full length of the coil and (b) is an enlarged view of the coil tail end. As shown in this figure, the coil was within the range of the thickness tolerance over the entire length including the coil tail end.

  On the other hand, FIG. 6 is a diagram showing the thickness deviation when stacked by the customer calculated from the measured value of the plate thickness. That is, from the measured value of the plate thickness obtained as shown in FIG. 5, the plate thickness deviation (Δt) is sampled every 150 mm, which is the punching pitch at the customer in the longitudinal direction of the coil, and this is the number of layers 200. Data obtained by accumulating individual data is plotted. As shown in this figure, the coil is within the allowable thickness deviation over almost the entire length of the coil, but only one point at the tail end of the coil deviates from the allowable thickness deviation (AS). This portion corresponds to the region X in the enlarged view of the plate thickness chart shown in FIG. 5B, but the plate thickness of this portion is also within the plate thickness tolerance from FIG. It turns out that it is thick.

  Thus, by obtaining the thickness deviation at the time of stacking, it is possible to recognize a defective thickness portion that cannot be determined from the normal thickness chart as shown in FIG. 5, and remove this portion before product shipment. As a result, there is no longer a problem when a customer uses the laminate.

  The plate thickness determination method of the present invention is not limited to the above-described embodiment, and in particular, the sampling method of the measured plate thickness and plate thickness deviation, and these data are accumulated within the range where the data is used at the same time. The method and the like can be appropriately changed within the scope of the object of the present invention.

  Moreover, although the said embodiment demonstrated the steel plate as an example as a board | plate material, it cannot be overemphasized that it can apply similarly to metal plates other than a steel plate.

(A) And (b) is a figure which shows an example of the punching and laminating method of the steel plate in a consumer. The conceptual diagram which showed an example of the structure of the information processing apparatus with which the board | plate thickness judgment method which is one embodiment of this invention is implemented, and a processing process. The flowchart which shows an example of the process of the board thickness determination method of the board | plate material which is one embodiment of this invention. The flowchart which shows an example of the manufacturing method of the board | plate material which is one embodiment of this invention. (A) And (b) is the chart which measured plate | board thickness with the gamma ray plate | board thickness meter with respect to the coil longitudinal direction. The figure which showed the thickness deviation at the time of laminating | stacking by the consumer calculated from the measured value of sheet thickness. The figure which represented the plate | board thickness deviation of the longitudinal direction of a steel plate typically.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Information processing part 11 ... Thickness measurement data input part 12 ... Thickness deviation calculation part 13 ... Thickness tolerance judgment part 14 ... Thickness deviation accumulation part 15 ... Thickness deviation judgment part 16 ... Thickness pass / fail judgment part 20 ... Storage device 21 ... Plate thickness measurement data file 22 ... Plate thickness determination data file

Claims (8)

  A method for determining the thickness of a plate material used by laminating, wherein the deviation from the plate thickness target value of the plate thickness measured in the longitudinal direction of the plate material is simultaneously accumulated within a range used for lamination, and a cumulative value is obtained, A plate thickness determination method for a plate material, wherein pass / fail determination of a plate thickness is performed based on a cumulative value.   A method for determining a plate thickness of a plate material to be used by stacking, measuring a deviation from a plate thickness target value in a plate material longitudinal direction at a pitch at which the plate material is punched for stacking, and the number of sheets to be stacked A plate thickness determination method for a plate material, wherein a cumulative value is obtained by accumulating deviations, and a pass / fail determination of the plate thickness is performed by comparing the cumulative value with an allowable deviation in thickness when laminated.   The plate thickness determination method according to claim 1 or 2, wherein an average value of a plurality of plate thicknesses in each region where the plate material is punched is used as the plate thickness.   The said board | plate material is an electromagnetic steel plate obtained by rolling, The board | plate thickness judgment method of the board | plate material of any one of Claim 1 to 3 characterized by the above-mentioned. It is a manufacturing method of the board material used by laminating,
Rolling the plate material;
Measuring the plate thickness in the longitudinal direction of the plate,
Deviation from the thickness target value of the plate thickness measured in the longitudinal direction of the plate material, the cumulative value within the range that is used at the same time to obtain the cumulative value, the pass / fail judgment of the plate thickness by the cumulative value,
Based on the pass / fail judgment, the process of selecting the rejected part of the plate material,
A method for producing a plate material, comprising: It is a manufacturing method of the board material used by laminating,
Rolling the plate material;
Measuring the plate thickness in the longitudinal direction of the plate,
Measure the deviation of the plate thickness from the plate thickness target value in the longitudinal direction of the plate at the pitch at which the plate is punched for lamination, and accumulate the plate thickness deviation for the number of sheets to be laminated to obtain a cumulative value. A step of performing pass / fail judgment of the plate thickness by comparing the thickness tolerance tolerance when laminated;
Based on the pass / fail judgment, the process of selecting the rejected part of the plate material,
A method for producing a plate material, comprising:   The plate material manufacturing method according to claim 5 or 6, wherein an average value of a plurality of plate thicknesses in each region where the plate material is punched is used as the plate thickness.   The said board | plate material is an electromagnetic steel plate, The manufacturing method of the board | plate material of any one of Claims 5-7 characterized by the above-mentioned.

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