JP5983311B2 - Steel plate shape correction method - Google Patents

Description

  The present invention relates to a method for correcting the shape of a steel plate, and is particularly suitable for correcting a shape such as distortion of a steel plate offline.

  As an apparatus for automatically measuring the shape of a steel plate, for example, as described in Patent Document 1 below, a measuring device composed of a plurality of optical distance meters is installed on a steel sheet conveyance line, and the steel plate passes through this measuring device. The distance from the light reflection state to the steel plate surface, that is, the height of the steel plate surface, is detected, and the shape of the steel plate surface is measured continuously with this height. However, since this steel plate shape measuring device is not suitable for off-line shape measurement, the applicant of the present application has proposed a shape correction device with a steel plate shape measuring device described in Patent Document 2 below. The shape measuring apparatus described in Patent Document 2 polarizes laser light from one laser light source, scans the polarized laser light, measures a predetermined group of detection points on a stationary steel plate, The shape of the steel plate is measured from the detected group data. Therefore, the shape of the steel plate can be measured even when the steel plate is stationary offline.

JP-A-5-237546 JP 2010-155272 A

However, in the steel plate shape correction device described in Patent Document 2, it is not specifically described in what procedure the shape correction is performed using the measured shape of the steel plate. For example, when correcting the shape of a steel sheet using a press ram of a press machine, the shape of the steel plate under the pressure ram during shape correction should be measured, and which position is pressed under what conditions based on the measurement result. There is a need for a procedure to correct it.
This invention is made paying attention to the above problems, and provides the steel plate shape correction method which can correct a steel plate efficiently from the steel plate shape under the pressurization ram during shape correction. It is for the purpose.

  In order to solve the above problems, a steel sheet shape correction method according to the present invention includes a press machine provided with a pressurizing ram, a transport apparatus that is provided on the input / output side of the press machine and transports the steel sheet, and is transported by the transport apparatus. A position detection device for detecting the position of the steel sheet to be polarized, and the laser light from one laser light source is polarized, the polarized laser light is scanned to measure a predetermined group of detection points on the steel sheet, and A steel plate shape correction method comprising a steel plate shape measuring device for measuring the shape of a steel plate from detection group data, wherein the steel plate under the pressure ram is based on position information of the steel plate detected by the position detection device. The shape is measured by the steel plate shape measuring device, the shape of the steel plate is evaluated from the measured shape measurement result of the steel plate, the shape correction position and the shape correction condition of the steel plate are obtained, and the obtained shape correction position is the pressurization. To be under the ram Conveying the steel plate feeding device, by the pressure ram in the calculated shape correction condition is characterized in carrying out the straightening of the steel sheet.

Further, in performing the shape evaluation of the steel sheet, a difference gap of the steel sheet is obtained, and a position where the difference gap is larger than a predetermined value set in advance is evaluated as a correction position.
Further, when the steel sheet has a long side and a short side, the shape correction on the short side is performed prior to the shape correction on the long side.

  Thus, according to the steel plate shape correction method of the present invention, the steel plate shape measuring device measures the shape of the steel plate under the pressure ram based on the position information of the steel plate detected by the position detecting device, and the measured steel plate. The shape of the steel sheet was evaluated from the shape measurement results of the steel sheet to determine the shape correction position and the shape correction condition of the steel sheet, and the steel sheet was transported with a transport device so that the determined shape correction position was under the pressure ram. The shape of the steel sheet is corrected with a pressure ram under the shape correction conditions. Therefore, the shape of the steel plate can be efficiently corrected from the shape of the steel plate under the pressure ram during shape correction.

Further, in performing the shape evaluation of the steel sheet, a difference gap of the steel sheet is obtained, and a position where the difference gap is larger than a predetermined value set in advance is evaluated as a correction position. Therefore, it is possible to efficiently correct the shape in the difference direction.
Moreover, when a steel plate has a long side and a short side, the shape correction of the whole steel plate can be efficiently performed by performing the shape correction on the short side prior to the shape correction on the long side.

It is a top view which shows one Embodiment of schematic structure of the steel plate shape correction apparatus to which the steel plate shape correction method of this invention is applied. It is a schematic block diagram of the laser irradiation apparatus which comprises the laser distance meter in the shape measuring apparatus of FIG. It is a flowchart which shows the arithmetic processing for the steel plate shape correction performed within the control apparatus of FIG. It is a flowchart of the arithmetic processing performed by the arithmetic processing of FIG. It is explanatory drawing of the width correction performed by the arithmetic processing of FIG. It is a flowchart of the arithmetic processing performed by the arithmetic processing of FIG. It is explanatory drawing of the longitudinal correction performed by the arithmetic processing of FIG.

  Hereinafter, a steel plate shape correcting apparatus to which a steel plate shape correcting method according to an embodiment of the present invention is applied will be described with reference to the drawings. FIG. 1 is a plan view showing a schematic configuration of the steel sheet shape correcting device of the present embodiment. This steel plate shape correction apparatus corrects the shape of the steel plate S offline. Reference numeral 1 in the drawing denotes a press machine that corrects the shape of the steel sheet S. An entrance bed 3 is disposed on the entry side of the press machine 1, and an exit bed 4 is disposed on the exit side of the press machine 1. . Each of the beds 3 and 4 is provided with a large number of rollers for transporting the steel sheet S, and the transport state of the steel sheet S can be controlled by controlling the rotation state of the rollers. That is, these beds 3 and 4 constitute a conveying device for the steel sheet S. In addition, a position detection device 7 that detects the position of the steel sheet S is provided on the sides of the entrance bed 3 and the exit bed 4. The position detection device 7 scans the laser beam in the conveyance direction of the steel plate S to measure the shape in the conveyance direction of the steel plate S, as in the shape measurement device described later, and from which position the steel plate S is located based on the shape measurement result. To detect.

  In the case of the press machine 1 of the present embodiment, the steel plate S is pressurized from above with the pressurizing ram 2, and a bending moment is mainly applied to the steel plate S to correct the shape of the steel plate. The shape of the steel plate S is measured by a steel plate shape measuring device described later. The parameters for correcting the shape of the steel sheet include, for example, a differential gap obtained from the shape of the steel sheet S, a pressure applied by the pressure ram 2, a position and interval of a shim called a shim, a position of the steel sheet S, that is, the steel sheet S by the beds 3 and 4. The conveyance state of the is mentioned. In the steel plate shape correction by the press machine 1 of the present embodiment, two shims are laid under the steel plate S, and the steel plate S in the portion between the shims is pressed with the pressure ram 2. The bending moment due to the pressure ram 2 is generated only in the steel plate S in the portion between the shims. The above-described various parameters are adjusted in consideration of the deformation amount of the steel sheet S due to this bending moment and the return amount when pressure is released, the so-called springback amount. The arithmetic processing for shape correction control will be described in detail later.

  A shape measuring device 5 was installed on the entry side of the entry bed 3 and the exit side of the exit bed 4, and a control device 6 was installed on the side of the exit bed 4. Among these, the shape measuring device 5 includes a laser distance meter that detects the distance to the detection point with a laser beam, and a computer system that measures the shape of the steel sheet S from the distance data detected by the laser distance meter. . The concrete steel plate shape measuring method of the shape measuring device 5 is the same as that of the Patent Document 2 previously proposed by the applicant of the present application. Therefore, the shape measuring apparatus 5 of the present embodiment includes a laser rangefinder that measures the distance by scanning the laser beam three-dimensionally.

  As shown in FIG. 2, the laser distance meter of the present embodiment has a laser light source 11 mounted on a turntable 12, and a known galvanometer mirror 13 is disposed at the laser emission port of the laser light source 11. The rotation axis of the galvanometer mirror 13 coincides with the laser beam from the laser emission port of the laser light source 11, and the rotation axis of the galvanometer mirror 13 is orthogonal to the rotation axis of the turntable 12. In this embodiment, by rotating the galvanometer mirror 13, the laser light from the laser light source 11 is polarized in the longitudinal direction of the steel sheet S, that is, in the conveying direction of the steel sheet S in FIG. 1, and the turntable 12 is rotated. Thus, the laser beam polarized from the galvanometer mirror 13 is scanned mainly in the width direction of the steel sheet S, that is, in the direction orthogonal to the conveying direction of the steel sheet S in FIG. In addition, the shape measuring apparatus 5 of this embodiment can measure the shape of the steel plate S not only on the entry bed 3 and the exit bed 4 but also under the pressurization ram 2 of the press 1.

  The control device 6 is constructed with a computer system such as a host computer, and based on the shape of the steel sheet S measured by the shape measuring device 5, for example, performs arithmetic processing described later to perform the press machine 1 and the beds 3 and 4. Control the operating state. Here, calculation processing for correcting the shape of the steel sheet S performed by the computer system in the control device 6 will be described with reference to the flowchart of FIG. This arithmetic processing is performed simultaneously with, for example, a steel plate shape correction start command. First, in step S1, the steel plate S is carried under the pressurization ram 2 of the press 1 by the entry side bed 3 and the exit side bed 4.

Next, the process proceeds to step S2, and the width correction control of the steel sheet S is performed according to the arithmetic processing of FIG. The steel sheet S is generally long in the transport direction and short in the direction orthogonal to the transport direction. That is, the steel sheet S has a short side and a long side, the short side direction is defined as the width direction, and the long side direction is defined as the long side direction.
Next, the process proceeds to step S3, and the longitudinal correction control of the steel sheet S is performed according to the arithmetic processing of FIG.
Next, it transfers to step S4 and it determines with the shape correction of the steel plate having been completed.
Next, the process proceeds to step S5, where the steel sheet S is discharged from below the pressurization ram 2 by the entry side bed 3 and the exit side bed 4, and the control is finished.
Next, calculation processing for width correction control performed in step S2 of FIG. 3 will be described using the flowchart of FIG. In this calculation process, first, in step S21, the entire shape of the steel sheet S carried under the pressurization ram 2 of the press machine 1 is measured by the shape measuring device 5, and the flatness is measured from the shape.

  Next, the process proceeds to step S22, where the difference gap in the width direction (width difference gap) is evaluated from the flatness of the steel sheet S measured in step S21, and the width difference gap, the correction position, and the correction condition are obtained. Displayed on the display device. The width difference gap is, for example, a relatively long and straight metal piece, that is, a gap formed between the difference sheet and the surface of the steel sheet S when the difference is applied to the surface of the steel sheet S in the width direction of the steel sheet S. means. This is performed at intervals set in advance in the longitudinal direction of the steel sheet S, and a portion where the width difference gap is larger than a predetermined value is set as a correction position. In principle, priorities are assigned to correction positions in descending order of the width difference gap. At that time, the ease of movement close to the ram is also included in the priority order. As the correction condition, for example, the stored pressure difference gap database is compared to determine the pressure condition of the shim (laying bar) and the pressure ram. The shim forms a gap between the steel plate and the surface plate. Since the pressure ram corrects the shape by applying a bending moment to the steel plate between the shims, if the width difference gap at the correction position is determined, the position where the shim is laid and the pressure condition of the pressure ram are determined. . The pressurization condition of the pressurization ram determines the thickness of the shim and the rolling force (load) by the pressurization ram from the thickness, width, yield stress, etc. of the steel plate. As described in Patent Document 2, for example, the curvature of the pressure correction position obtained from the width difference gap is equivalent to the bending moment caused by the pressure ram, and hence the bending moment and the sectional secondary moment are called. The load (rolling force) to be applied is obtained from the material properties such as the width, thickness section modulus, and longitudinal elastic modulus of the steel sheet S. Even if a load is applied to the steel plate, the steel plate has an elastic recovery called a spring back, and this spring back is added by a shim. Therefore, the thickness of the shim is equal to the amount of springback.

Next, the process proceeds to step S23, where it is determined whether or not all the width difference gaps are within the predetermined value. If all the width difference gaps are within the predetermined value, the width correction control is completed. If not, the process proceeds to step S24.
In step S24, the correction position with the high priority obtained in step S22 is moved below the pressure ram 2.

  Next, the process proceeds to step S25, where the steel sheet S is pressed under the correction condition obtained in step S22 to perform shape correction in the width direction. For example, when there are a plurality of correction positions in the width direction and the longitudinal direction of the steel sheet S as shown in FIG. 5, first, shape correction is performed in the order of alignment at the correction positions aligned in the longitudinal direction. Once the shape correction at the correction positions aligned in the longitudinal direction is completed, the shape is moved in the width direction, and then the shape correction is performed in the alignment order at the correction positions aligned in the longitudinal direction. Promote. This order of movement corresponds to the ease of movement close to the ram described above.

Next, it transfers to step S26, the shape of the steel plate S of the lower part of the pressurization ram 2 is measured with the shape measuring apparatus 5, and flatness is measured from the shape.
Next, the process proceeds to step S27, and the width difference clearance evaluation is performed in the same manner as in step S22 from the flatness of the steel plate S below the pressurization ram 2 measured in step S26. The correction condition is obtained and displayed on a display device such as a monitor.

Next, the process proceeds to step S28, where it is determined whether or not the width difference gap of the steel sheet S below the pressure ram 2 is within a predetermined value. If not, the process proceeds to step S25.
In step S29, it is determined whether or not there is another correction position obtained in step S22. If there is a correction position, the process proceeds to step S24. If not, the process proceeds to step S21.
Next, calculation processing for longitudinal correction control performed in step S3 of FIG. 3 will be described using the flowchart of FIG. In this calculation process, first, in step S31, the entire shape of the steel sheet S carried under the pressure ram 2 of the press machine 1 is measured by the shape measuring device 5, and the flatness is measured from the shape.

  Next, the process proceeds to step S32, where the longitudinal difference gap (longitudinal difference gap) is evaluated from the flatness of the steel sheet S measured in step S31, and the width difference gap, the correction position, and the correction condition are obtained. Displayed on the display device. The longitudinal difference gap means a gap formed between the difference and the surface of the steel sheet S when the difference is applied to the surface of the steel sheet S in the longitudinal direction of the steel sheet S as described above. This is performed for each preset interval in the width direction of the steel sheet S, and a portion where the longitudinal difference gap is larger than a preset predetermined value is set as a correction position. In principle, priorities are assigned to correction positions in descending order of the longitudinal difference gap. At that time, the ease of movement close to the ram is also included in the priority order. For the correction condition, for example, the stored pressure difference gap database is compared, and the pressure condition of the shim and pressure ram is determined. The position where the shim is laid and the method for determining the pressurization condition of the pressurization ram are the same as in step S22 of the calculation process of FIG.

Next, the process proceeds to step S33, where it is determined whether or not all the longitudinal differential gaps are within the predetermined value. If all the longitudinal differential gaps are within the predetermined value, the longitudinal correction control is completed. If not, the process proceeds to step S34.
In step S34, the correction position with the high priority obtained in step S32 is moved below the pressure ram 2.

  Next, the process proceeds to step S35, in which the steel sheet S is pressed under the correction condition obtained in step S32 to correct the shape in the longitudinal direction. For example, when there are a plurality of correction positions in the width direction and the longitudinal direction of the steel sheet S as shown in FIG. 7, first, the shape correction is performed in the order of alignment at the correction positions aligned in the width direction. When the shape correction at the correction positions aligned in the width direction is completed, the shape is moved in the longitudinal direction, then the shape correction is performed in the alignment order at the correction positions aligned in the width direction, and this is repeated to correct the longitudinal direction. Promote. This order of movement corresponds to the ease of movement close to the ram described above.

Next, it transfers to step S36, the shape of the steel plate S of the lower part of the pressurization ram 2 is measured with the shape measuring apparatus 5, and flatness is measured from the shape.
Next, the process proceeds to step S37, and from the flatness of the steel sheet S in the lower portion of the pressure ram 2 measured in step 326, the longitudinal difference gap evaluation is performed in the same manner as in step S32, the longitudinal difference gap, the correction position, The correction condition is obtained and displayed on a display device such as a monitor.

Next, the process proceeds to step S38, where it is determined whether or not the longitudinal difference gap of the steel sheet S below the pressure ram 2 is within a predetermined value. If not, the process proceeds to step S35.
In step S39, it is determined whether or not there is another correction position obtained in step S32. If there is a correction position, the process proceeds to step S34. If not, the process proceeds to step S31.

  According to this calculation process, the correction position and the correction condition are obtained from the shape of the steel sheet S measured by the shape measuring device 5, and the shape of the entire steel sheet can be pressure corrected while changing the position for pressure correction one after another. it can. In the above-described arithmetic processing, all correction operations are automated by a program. However, for example, the operator may move the correction position or adjust the forcing condition. As is well known, the pressure correction condition by the pressure ram is determined by the specifications of the steel sheet and the difference gap, but there are many cases where the result is unpredictable. If there is an enormous pressure correction database, various conditions can be added in addition to steel sheet specifications and gaps, but pressure correction conditions are unstable while the database is small. In some cases, operator intervention is required. Then, by adding the pressure correction performed by the operator to the database, the pressure correction condition can be made more accurate.

  Thus, according to the steel sheet shape correction method of the present embodiment, the steel plate shape measuring device 6 measures the shape of the steel plate S under the pressure ram 2 based on the position information of the steel plate S detected by the position detecting device 7. Then, the shape of the steel plate S is evaluated from the measured shape measurement result of the steel plate S to obtain the shape correction position and the shape correction condition of the steel plate S so that the obtained shape correction position is below the pressure ram 2. The steel plates S are conveyed by the beds 3 and 4 and the shape of the steel plates S is corrected by the pressure ram 2 under the obtained shape correction conditions. Therefore, the shape of the steel sheet S can be efficiently corrected from the shape of the steel sheet S under the pressure ram 2 during shape correction.

Further, when evaluating the shape of the steel sheet S, a difference gap of the steel sheet is obtained, and a position where the difference gap is larger than a predetermined value set in advance is evaluated as a correction position. Therefore, it is possible to efficiently correct the shape in the difference direction.
Moreover, when the steel plate S has a long side and a short side, the entire shape correction of the steel plate S can be performed efficiently by performing the shape correction on the short side prior to the shape correction on the long side.

DESCRIPTION OF SYMBOLS 1 Press machine 2 Pressurization ram 3 Incoming bed 4 Outgoing bed 5 Shape measuring device 6 Control device 7 Position detection device 11 Laser light source 12 Turntable 13 Galvano mirror

Claims (3)

  A press machine provided with a pressurizing ram; a transport device provided on the input / output side of the press machine for transporting a steel plate; a position detection device for detecting the position of the steel plate transported by the transport device; and one laser light source A steel plate shape measuring device that polarizes the laser beam from the laser beam, scans the polarized laser beam, measures a predetermined group of detection points on the steel plate, and measures the shape of the steel plate from the detection group data A steel plate shape correction method provided, wherein the steel plate shape measuring device measures the shape of the steel plate under the pressure ram based on the position information of the steel plate detected by the position detecting device, and the shape of the measured steel plate The shape of the steel sheet is evaluated from the measurement result to determine the shape correction position and the shape correction condition of the steel sheet, the steel sheet is transferred by a transfer device so that the determined shape correction position is under the pressure ram, and the determination is performed. In the shape correction conditions, Steel straightening method and performing straightening of the steel sheet by the ram.   The steel plate shape correction method according to claim 1, wherein, in performing the shape evaluation of the steel plate, a difference gap of the steel plate is obtained, and a position where the difference gap is larger than a predetermined value set in advance is evaluated as a correction position. .   The steel plate shape correcting method according to claim 2, wherein when the steel plate has a long side and a short side, the shape correction on the short side is performed prior to the shape correction on the long side.

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