JP2001004362A - Method and device for measuring shape of metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the amount of lateral bending and flatness by a simple constitution. SOLUTION: Distances to a surface of a steel plate 17 are detected at three predetermined longitudinal locations of detection in the steel plate 17 correspondingly to widthwise locations along the width of the steel plate 17. By the detected distances, the amount of lateral bending of the steel plate 17 is detected. Then distances to the surface of the steel plate 17 are detected at each of the plurality of widthwise locations of the steel plate 17 correspondingly to the longitudinal locations along the length of the steel plate 17. By the detected distances, the flatness of the steel plate 17 is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the shape of a metal plate such as a coiled metal band, and more particularly to a flatness and a metal plate representing the magnitude of the wave of the metal plate. The present invention relates to an apparatus for measuring the amount of lateral bending representing the degree of linearity.

[0002] In the specification, the term "tangent" refers to a straight line connecting a peak and a peak and a straight line connecting a bottom and a bottom, and further includes a tangent tangent to a straight line or a curve near the peak and the bottom. Will be interpreted.

[0003]

2. Description of the Related Art In order to detect a shape defect of a cold-rolled metal plate, for example, a steel plate, a lateral bending amount C and a flatness F are detected.
Need to be measured. Conventionally, when measuring the lateral bending amount C of a steel sheet, the steel sheet is placed on a surface plate, and the distance between the end of the surface plate and the side end of the steel plate is set to the entry side in the longitudinal direction of the steel plate,
Inspectors take measurements at each of the center and exit positions.
In this prior art, since the length of the steel plate is, for example, about 15 m, the moving distance of the inspector is long, for example, about 30 m for reciprocation, and the work efficiency is poor. Therefore, the downtime of the steel sheet production line is prolonged, and the line operation rate is reduced.

[0004] As prior art for solving this problem, for example, Japanese Utility Model Laid-Open No. 5-90310, Japanese Patent Laid-Open No. 5-40032, and Japanese Utility Model Laid-Open No. 2-128514 are disclosed. These prior arts each measure the distance from the reference line to the side end of the steel sheet using a distance detection sensor at three points on the reference line along the length direction of the steel sheet, and automatically measure the distance based on the measured distance. The lateral bending amount C is calculated.

Conventionally, when measuring the flatness F of a steel sheet, an inspector applies a 2 m metal gauge to the surface of the steel sheet to be inspected, and places the steel sheet and the metal between two points where the steel sheet and the metal scale are in contact. Measure the gap of the shaku, find the maximum gap as the peak height H,
The horizontal distance between the two peaks at which the maximum gap is obtained is determined as the wavelength L, and the flatness F is calculated. It is necessary to measure such flatness on both sides of the steel sheet and the center position in the width direction along the longitudinal direction of the steel sheet. In this case, in order to improve the measurement efficiency, inspection is performed on both sides of the steel sheet. Each inspector measures the flatness of each side edge of the steel plate, and one of the inspectors measures the flatness of the center of the steel plate. The flatness of the steel plate is 100m
The measurement is performed every time, and each measurement time requires about 5 minutes. During this measurement, the production line of the steel plate must be stopped, and thus the measurement time is long, so that the line availability is significantly reduced.

[0006]

In the prior art for detecting the lateral bending amount C, the lateral bending amount can be automatically obtained. However, all of them detect only the lateral bending amount C. The lateral bending amount C and the flatness F cannot be detected simultaneously.

[0007] Other prior art techniques for detecting flatness include:
For example, JP-A-3-111711 and JP-B-4-14
Although 728 is present, in each case, only the flatness F is detected as in the prior art for detecting the lateral bending amount C, and the lateral bending amount C and the flatness F cannot be detected simultaneously.

In order to simultaneously detect the lateral bending amount C and the flatness F, a device for detecting the lateral bending amount C and a device for detecting the flatness F may be connected. However, in this case, there is a problem that the device becomes large.

As a result of various studies on this problem, the present inventors have found that a method for efficiently detecting both the lateral bending amount C and the flatness F of a steel sheet using a sensor for detecting the distance to the surface of the steel sheet. Was found. In addition, this makes it possible to share the sensor, and succeeded in simplifying the device.

The present invention has been made based on such findings, and an object of the present invention is to provide a metal plate which can simultaneously detect the amount of lateral bending C and the flatness F with a simple configuration. An object of the present invention is to provide a shape measuring method and apparatus. Another object of the present invention is to provide a method and an apparatus for measuring the shape of a metal plate, which can efficiently measure the shape of the metal plate in a short time.

[0011]

According to the present invention, there are provided three detection positions in the longitudinal direction of a metal plate along the width direction of the metal plate corresponding to the positions in the width direction. The distance to each, along the longitudinal direction of the metal plate, the distance to the surface of the metal plate corresponding to the position in the longitudinal direction, for each of a plurality of positions in the width direction of the metal plate, The lateral bending amount C of the metal plate is calculated based on the distance detected along the width direction of the metal plate at the three predetermined detection positions,
A metal plate shape measuring method, wherein a flatness F of the metal plate is calculated based on a distance detected along a longitudinal direction of the metal plate.

According to the present invention, at three predetermined detection positions in the longitudinal direction of the metal plate, along the width direction of the metal plate, the distances to the surface of the metal plate corresponding to the positions in the width direction are respectively set. Since it is detected, the lateral bending amount C of the metal plate can be automatically obtained by a method described later. Further, along the longitudinal direction of the metal plate, the distance to the surface of the metal plate corresponding to the position in the longitudinal direction is detected at each of a plurality of positions in the width direction of the metal plate. The flatness F of the plate can be automatically obtained. in this way,
By detecting the distance to the surface of the metal plate, both the lateral bending amount C and the flatness F of the metal plate can be detected, so that the sensor can be shared and the configuration can be simplified. Further, since the lateral bending amount C and the flatness F of the metal plate can be simultaneously detected by one device, the shape of the metal plate can be measured efficiently and in a short time.

Further, according to the present invention, the metal plate is placed on a surface plate having a horizontal surface, and the three detection positions are predetermined outside a metal plate on a reference straight line extending in the longitudinal direction of the metal plate.
A sensor that detects the distance to the surface of the platen or the surface of the metal plate is placed above the surface plate, and the sensor is moved along the width direction of the metal plate and defined as a sensor corresponding to the position of the sensor in the width direction. Detecting the distance to the surface of the board or metal plate, and when the detected distance deviates from a predetermined discrimination level,
Judging that the side edge of the metal plate has been detected, the distance from the reference straight line of the side edge of the metal plate at each of the three detection positions is detected, and the distance of the metal plate from the detected reference straight line is determined. It is characterized in that the lateral bending amount C is calculated.

According to the present invention, the metal plate is placed on the surface plate, and three measurement positions are predetermined on a reference straight line extending in the longitudinal direction of the metal plate, and the width of the metal plate at each measurement position is determined. The sensor is moved along the direction, and the distance between the sensor and the surface of the surface plate or metal plate is detected in accordance with the position of the sensor in the width direction. When the sensor reaches the side edge of the metal plate, the detected distance is shortened by the thickness of the metal plate.Therefore, by detecting a change in the detected distance, it is possible to detect the side edge of the metal plate. it can. This makes it possible to detect the distance in the width direction between the reference straight line and the side edge of the metal plate at the three places, and thus it is possible to automatically calculate the lateral bending amount C of the metal plate by Expression 1 described below.

Further, according to the present invention, when the distance between the sensor and the surface of the platen or the surface of the metal plate deviates from the predetermined discrimination level and continues for a predetermined length or more in the width direction, the side edge of the metal plate is detected. It is characterized by judging that it has occurred.

According to the present invention, when the detected distance deviates from the predetermined discrimination level and continues for a predetermined length or more in the width direction, it is determined that the side edge of the metal plate has been detected. Therefore, erroneous detection of the side edge of the metal plate due to noise and foreign matter can be reliably prevented.

Further, according to the present invention, when the sensor is moved along the width direction of the metal plate and the distance between the sensor and the surface plate or the surface of the metal plate is detected in accordance with the position in the width direction of the sensor, An effective measurement area including a side end is determined in advance, and a moving speed of the sensor from the reference straight line to the effective measuring area is set to be higher than a moving speed of the sensor in the effective measuring area.

According to the present invention, the effective measurement area including the side edge of the metal plate is predetermined, and the moving speed of the sensor from the reference straight line to the effective measuring area is higher than the moving speed of the sensor in the effective measuring area. Since the speed is set to be high, the time required for the sensor to reach the effective measurement position can be shortened, and the side edge of the metal plate can be quickly detected.

According to the present invention, there is provided a first detection method for detecting a distance to a surface of a metal plate along a width direction of the metal plate at a predetermined position in a longitudinal direction of the metal plate in accordance with the position in the width direction. Means, and a plurality of positions in the width direction of the metal plate, which are disposed in the longitudinal direction so as to be shifted from the first detection means in the longitudinal direction, and correspond to the position in the longitudinal direction. Each time, the second detecting means for detecting and the first and second detecting means are arranged in the longitudinal direction so as to be displaced in the longitudinal direction, and along the width direction of the metal plate to the surface of the metal plate corresponding to the position in the width direction. A metal plate comprising: a third detecting means for detecting a distance between the first and second detecting means; and a calculating means for calculating a lateral bending amount C and a flatness F in response to outputs of the first, second and third detecting means. Is a shape measuring device.

According to the present invention, the first detecting means 21 includes a sensor S11 and an encoder EN11 in an embodiment described later.
The distance to the surface of the metal plate is detected corresponding to the position in the width direction of the metal plate, and a change in the detected distance is detected to detect the side edge of the metal plate. Third detecting means 23
Is configured by a sensor S31 and an encoder EN31, and detects the side end of the metal plate in the same manner as the first detecting means.
The second detecting means 22 is arranged, for example, in the middle of the first and third detecting means in the longitudinal direction of the metal plate. This second detecting means is constituted by sensors S21 to S25 and encoders EN21 and EN22 in an embodiment described later.
The distance to the surface of the metal plate is detected corresponding to the position in the width direction and the length direction of the metal plate. Based on the outputs of the first to third detecting means, the lateral bending amount C and the flatness F are calculated and calculated by the calculating means. Therefore, the lateral bending amount C
And the flatness F can be automatically measured. In addition, the second detecting means performs the lateral bending amount C before the measurement of the flatness F.
Is measured by the sensor S21 to measure the side edge 37 of the metal plate.
Therefore, the second detecting means can arrange the sensors S21 to S25 at predetermined positions in the width direction of the metal plate with reference to the side end position. Therefore, even if the metal plate is meandering, the sensors S21 to S25 can be reliably arranged on the metal plate to detect the flatness F.

Further, in the present invention, the arithmetic means may be arranged such that a distance detected by each of the first, second and third detecting means is determined from a predetermined discrimination level while the sensors move in the width direction of the metal plate. When the detached state continues for a predetermined length or more, it is determined that the side edge of the metal plate has been detected, and the output of each sensor position detecting means when the side edge of the metal plate has been detected causes the lateral bending. It is characterized in that the quantity C is calculated.

According to the present invention, the first, widthwise direction of the metal plate is
Sensors S11, S21, S of the second and third detecting means
As described later with reference to FIGS. 10 and 12, the distance between each sensor and the metal plate changes suddenly to prevent the side edge from being erroneously detected by noise when the 31 moves. Only when the output of the sensor from the sudden change point 105 becomes continuous for a predetermined length W3 or more in the width direction of the metal plate, it is determined that the side edges 34, 35, and 37 of the metal plate have been detected, and the amount of lateral bending is determined. Calculate C.

Such erroneous detection of the side edge of the metal plate is likely to occur due to irregular reflection near the side edge of the metal plate when a laser displacement meter is used as a sensor, for example, and the metal plate is mounted on a surface plate. Misdetection occurs due to foreign matter undesirably present on the surface plate in the state. In the present invention, when such an erroneous detection is made when the output of the sensor continues for a predetermined length W3 or more in the width direction, the output of the sensor position detecting means at which the sudden change point 105 is obtained is the side edge of the metal plate. To prevent false detection.

[0024]

FIG. 1 is a perspective view showing the entire configuration of a steel sheet shape measuring apparatus 13 according to an embodiment of the present invention. On a surface plate 14 having a horizontal surface, a metal plate, for example, a steel plate 17 is arranged from the entrance side 15 to the exit side 16. At the time of shape measurement, the traveling of the steel plate 17 in the traveling direction 18 is stopped, and the steel plate 17 is placed on the surface plate 14 so that the tension of the steel plate 17 becomes zero and the steel plate 17 is brought into a natural state. In this production line, the width direction position of the steel plate 17 is controlled such that the center position 107 in the width direction of the steel plate 17 substantially coincides with the center position 108 of the platen 14, and the vehicle runs. The longitudinal direction of the steel plate 17 is
It corresponds to the running direction 18. Along with the traveling direction 18, a first detecting means 21 fixed to the floor in relation to the surface plate 14, and a second detecting means arranged to be shifted downstream from the first detecting means 21 in the traveling direction 18. Means 22 and third detecting means 23 which are arranged on the opposite side of the first detecting means 21 in the running direction 18 with respect to the second detecting means 22 are provided. The third detection means 23 is disposed on the same outer side with respect to the first detection means 21 and the surface plate 14 and has a configuration similar to that of the first detection means 21. The arrangement order of the first to third detection means 21, 22, 23 is not limited to this order, and may be arranged in another order.

FIG. 2 is a plan view of the steel plate 17 for explaining the definition of the amount of lateral bending C of the steel plate 17. The lateral bending amount C indicates the degree of linearity of the steel plate 17, and a smaller lateral bending amount C indicates that the steel plate 17 is straighter. The side ends 34 and 35 of the steel plate 17 on the entry side and the exit side are connected by a straight line 36, and the distance between the straight line and the center side end 37 is the lateral bending amount C. The three detection positions 40, 39,
The distances E1, E2, E3 between the side ends 34, 37, 35 at 41 and the side ends 38 of the surface plate 14 are measured. The side end 38 of the platen 14 forms a reference straight line extending in the longitudinal direction of the steel plate 17. Further, distances L1 and L1 from the center detection position 39 to the detection positions 40 and 41 on the entrance 15 and the exit 16 respectively.
L2 is known. The lateral bending amount C is calculated by Expression 1. C = (E2-E1)-{(E3-E1) .L1 / (L1 + L2)} (1)

The side end 37 does not have to be located at the center between the side ends 34 and 35, that is, L1 does not have to be L2.
The distances E1, E2, and E3 are first to third detecting means 21 and
2, 23 respectively.

FIG. 3 is a diagram schematically illustrating the surface 24 of the steel plate 17 for explaining the definition of the flatness F. The flatness F represents the degree of the plate wave of the steel plate 17, and the flatness F
A smaller value indicates that the steel plate 17 has a flatter shape.
A tangent 27 is drawn on the peaks 25 and 26, which are two raised peaks of the plate wave on the surface 24 of the steel plate 17, and this tangent 27 is called a peak tangent. The peak tangent line 27 draws a perpendicular line 29 to the concave bottom 28 of the surface 24 of the steel plate 17 to determine the peak height H1. Similarly, peak 26,
A similar peak tangent line 31 is drawn between the peaks 30, and a peak height H2 of a perpendicular 33 between the peak tangent 31 and the bottom 32 is determined. In this way, the maximum peak height H among the plurality of peak heights H1 and H2 within the measurement range is obtained. For example, in FIG. 3, since H1 <H2, the maximum peak height H is H2. The horizontal distance between the peaks 26 and 30 from which the maximum peak height H was determined is determined as L. The flatness F is defined by Expression 2. F = H / L (2)

The shape measuring device 13 comprises a surface plate 14 having a horizontal upper surface and first to third detecting means 21, 22, 23.
And The platen 14 is arranged parallel to the running direction 18 of the steel plate 17 and is fixed to the floor by legs 42.

FIG. 4 is a front view of the first detecting means 21. The base 44 is erected and fixed at a fixed position as a floor outside the steel plate 17 and thus the platen 14. Base 4
4, a base end 46 of an arm 45 is provided with an arm shaft 47.
Supported by The base end portion 46 of the arm 45 can be angularly displaced around the axis of the arm shaft 47 between a detection posture shown in FIG. Angle θ1 may be, for example, 90 degrees. The axis of the arm shaft 47 is parallel to the running direction 18 which is the longitudinal direction of the steel plate 17 and is horizontal. Reference 56
4 shows a state in which the base end portion 46 of the arm 45 is in the detection posture shown in FIG.

The sensor S11 is movably provided in parallel with the arm 45 by a sensor moving means 58 fixed to the arm 45. When the arm 45 is in the detection posture parallel to the surface plate 14, the sensor S11
Alternatively, the distance to the surface of the steel plate 17 is detected. Sensor S
11 is realized by, for example, a laser displacement meter. The sensor moving means 58 for reciprocating the sensor S11 in the moving direction 60 includes a forward / reversely rotatable motor 61, a screw rod 62 rotationally driven by the motor 61, and a nut member 63 screwed to the screw rod 62. And Further, the motor 61 is provided with an encoder EN11 which is a sensor position detecting means for detecting the number of rotations of the screw rod 62. The encoder EN11 is driven by the rotation of the screw rod 62, and detects the movement position of the sensor S11 in the movement direction 60.

The third detecting means 23 has the same configuration as the first detecting means 21, has a sensor S31 corresponding to the sensor S11 as shown in FIG. 8 described later, and has an encoder corresponding to the encoder EN11. EN31.

FIG. 5 is a plan view of the second detecting means 22. The second detection means 22 includes a detection body 67.
The detection body 67 is provided on a pedestal 68 (shown in FIG. 6 described later) having a lifting mechanism, and can be raised and lowered. When the gantry 68 and the detection body 67 are at the lower limit position, a measurement operation is performed,
When the gantry 68 and the detector 67 are raised to the upper limit position, the production line of the steel plate 17 is in operation.

The detection body 67 has a traveling body 71.
The traveling body 71 moves in the traveling direction 1 along the first guide rail 69.
8 and run. The traveling body 71 is located at an upstream end position in the traveling direction 18 during driving. First guide rail 69
Extends in a running direction 18 which is a longitudinal direction of the steel plate 17 and substantially parallel to the steel plate 17. The first guide rails 69 are fixed to the gantry 68 and arranged on both outer sides of the surface plate 14, respectively. The traveling body 71 is provided with traveling body driving means 92 for driving the traveling body 71 to travel. The traveling body drive means 92 is provided with a motor 72 that can be rotated forward and backward, a screw rod 73 that is rotationally driven by the motor 72, and a nut member 74 that is screwed to the screw rod 73 and fixed to the traveling body 71. . The motor 72 is provided with an encoder EN21 which is a traveling body position detecting means. The traveling position of the traveling body 71 in the traveling direction 18 can be detected by the encoder EN21.

FIG. 6 is a front view showing a part of the detector 67. The traveling body 71 is provided with a second guide rail 75 substantially parallel to the steel plate 17 in the width direction of the steel plate 17 (the vertical direction in FIG. 5 and the horizontal direction in FIG. 6), that is, substantially parallel to the surface plate 14. A plurality of (five in the present embodiment) sensors S21 to S25 are commonly guided by the guide rail 75 and are movable in the movement direction 76. 5 and 6
Then, each of the sensors S21 to S25 is located at the outermost position in the width direction of the steel plate 17, that is, the platen 14 (the lowermost position in FIG. 5 and the leftmost position in FIG. 6). These sensors S21 to S25 are sequentially arranged in the width direction of the steel plate 17. The sensors S21 to S25 detect the distance to the surface of the steel plate 17, and have the same configuration as the sensors S11 and S31 described above. Above the sensors S21 to S25, a sensor moving means 77 for reciprocating the sensors S21 to S25 in the moving direction 76 is arranged. The sensor moving means 77 is provided on the traveling body 71.

FIG. 7 is a plan view of the sensor moving means 77. The sensor moving means 77 includes a moving member 81. The moving member 81 is moved along a pair of third guide rails 82 provided on the traveling body 71. The third guide rail 82
The steel plate 17 extends in the width direction (the left-right direction in FIG. 7), and
And extend horizontally. As shown in FIG.
As shown in (1), the gripping member 84 is provided so as to be vertically movable by the vertical displacement means 83. The gripping member 84 has an inverted U-shaped engagement recess 85 opened downward, and the engagement recess 85 vertically engages / disengages an engagement protrusion 86 formed on the upper part of the sensors S21 to S25. It is possible.

In the sensor moving means 77, a screw rod 87 parallel to the third guide rail 82 is provided on the traveling body 71 to move the moving member 81 in the moving direction 76. The screw rod 87 is screwed into a nut member 88 fixed to the moving member 81. The screw rod 87 is rotationally driven by a forward / reversely rotatable motor 89. The encoder EN22 constituting the sensor position detecting means detects a position along the moving direction of the engaging convex portion 86 engaged with the engaging concave portion 85 of the moving member 81, and accordingly, a position along the moving direction 76 of each of the sensors S21 to S25. I do.

FIG. 8 is a block diagram showing an electrical configuration of the steel sheet shape measuring device 13 according to one embodiment of the present invention. Input means 95 is connected to a processing circuit 94 realized by a microcomputer or the like. Input means 9
5 is, for example, an identification number for identifying a steel plate 17 whose shape is to be measured, which is realized by a keyboard or the like;
For example, the coil number and the width of the steel plate 17 are input. Push button 9 operated by operator to start measurement
6 is connected. Instead of the output from the input means 95 and the push button 96, the processing circuit 94 may be provided with a command signal from a host computer or the like.

A memory 97 is connected to the processing circuit 94, and first to third detecting means 21, 22, 23 are connected to the processing circuit 94, and outputs from the sensors S11, S21 to S25 and S31 are given. Encoder EN11, E
Outputs from N21, EN22 and EN31 are provided.
The third detecting means 23 has the same configuration as the first detecting means 21 as described above, is provided with a cylinder 98 similar to the cylinder 49 of the first detecting means 21, and includes a motor 99 similar to the motor 61. Be provided. The operation of the first to third detecting means 21, 22, 23 is controlled by the output of the processing circuit 94.

FIG. 9 is a flowchart for explaining the overall operation of the processing circuit 94. The process proceeds from step a1 to step a2, where the coil number, which is the identification number of the steel plate 17, and the width W1 of the steel plate 17 are input. In step a3, the traveling of the steel plate 17 is stopped to measure the lateral bending amount C and the flatness F, and the tension is released. Thus, the steel plate 17 is placed on the surface of the surface plate 14.

In step a4, the traveling body 71 of the second detecting means 22 moves to the longitudinal center position of the first and third detecting means 21 and 23, and the detecting body 67 descends to reach the lower limit position. In step a5, the arm 45 of the first and third detection means 21 and 23 is angularly displaced from the standing position to the tilted state, that is, the detection posture.

At step a6, the sensors S11, S2
1, S31 is moved inward in the width direction of the steel plate 17 to
7 are detected. The detected side edge is stored in the memory 97.

FIG. 10 shows the sensor S1 of the first detecting means 21.
FIG. 5 is a diagram showing an output waveform when 1 moves in a movement direction 60 (to the left in FIG. 4). An effective measurement width W2, which is an effective measurement area, is set in consideration of the width W1 of the steel sheet 17 input by the input means 95 and the widthwise deviation of the steel sheet 17 during the operation of the production line.

FIG. 11 is a simplified plan view of a part of the steel plate 17. The side end 37 of the steel plate 17 is displaced in the width direction (vertical direction in FIG. 11) during the driving operation. The effective measurement width W2 is
The side end 37 is set to a range that is always included, and the same applies to the side ends 34 and 35. Effective measurement width W
2 is determined by adding the sheet width W1 and the maximum meandering amount, the maximum lateral bending amount, and a predetermined margin value of the steel sheet 17 during the driving operation as described above. Side edges 34, 35, 37
The detection of will be described later with reference to FIG.

In step a7, the sensors S21 to S25 of the second detecting means 22 are set to the steel sheet 1 as shown in FIG.
7 in the width direction (vertical direction in FIG. 11) at equal intervals at intervals of W5. The distance W4 from the side end 37 of the sensor S21 and the distance W5 are set based on the plate width W1. Since the side end 37 of the steel plate 17 is detected in step a6, the sensors S21 to S25 can be reliably disposed on the steel plate 17 in step a7 even if the steel plate 17 is meandering.

In the next step a8, the traveling body 71 moves from the upstream end position in the traveling direction 18 to the downstream side in the traveling direction 18. As a result, the sensors S21 to S25 are
At each position in the width direction of 7, the unevenness of the surface, that is, the distance is detected along the running direction 18, and the detected distance is stored in the memory 97 corresponding to the position in the running direction detected by the encoder EN 21.

In steps a9 to a10, the detection of the second detecting means 22 is completed, the traveling body 71 travels in the reverse direction and returns to the upstream end position, and the sensors S21 to S25 are turned on as shown in FIG. 14 is returned to the outermost position. In the first and third detecting means 21 and 23, the sensor S11 is
The arm 45 is moved to the side 6 and the arm 45 is further raised.

In step a11, the amount of lateral bending C is calculated based on the outputs of the sensors S11 and S31 of the first and third detecting means and the sensor S21 of the second detecting means 22. In step a12, the flatness F is obtained at each position in the width direction of the steel plate 17, that is, for each of the sensors S21 to S25, based on the sensors S21 to S25 and the output of the encoder EN21. In this way, a series of operations are completed in step a13.

FIG. 12 is a flowchart for explaining the operation of the processing circuit 94 for detecting the side end 34 of the steel plate 17 by the first detecting means 21. Step g
From 1, the process proceeds to step g 2, where the board width W 1 is read from the memory 97. Referring to FIG. 10 described above, when moving the sensor S11 in the moving direction 76, the motor 61 of the first detecting means 21 performs step g3 until the effective measuring width W2 is reached.
In g5, the sensor S11 is moved at a high speed in the unmeasured state, and the time from the rest position to the effective measurement width W2 is reduced. After time t11 in FIG. 10 when the sensor S11 has reached the effective measurement width W2, the motor 61 moves the sensor S11 at a low speed and performs a level discrimination operation in step g6. Sensor S11 is at time t in FIG.
When the end of the effective measurement width W2 is reached at 12, the measuring operation of the side end 34 of the steel plate 17 is stopped, and the motor 61 is stopped. Such a position of the sensor S11 in the movement direction 76 is always detected by the encoder EN11.

In the present invention, the detection width W3, which is the length along the moving direction 76, is set to prevent erroneous detection of the side end 34 of the steel plate 17 due to noise and enable accurate detection.
When the sensor S11 moves in the moving direction 76 by the motor 61, the output of the sensor S11 is always level-discriminated by a predetermined discrimination level 101. The discrimination level 101 is based on the measurement range of the sensor,
And the minimum thickness of the steel plate 17 are taken into consideration.

The output of the sensor S11 includes noises 102 and 103 shown in FIG. Noise 10
2 and 103 are caused by, for example, irregular reflection of laser light at the end of the steel plate, and are also caused by foreign substances on the surface plate 14 and the like. In the present invention, in step g9, the sensor S
When the state of the time W when the output of No. 11 is equal to or more than the discrimination level 101 continues for the detection width W3 or more (W ≧ W3), that is, the state where the distance detected by the sensor S11 deviates from the discrimination level 101 in step g8 is a sudden change 104,10
When the detection width continues from 5 to the detection width W3 or more, it is determined that the side end 34 has been detected. Thus, in the embodiment shown in FIG. 10, the output of the sensor S11 is continuously derived from the discrimination level 101 for a period equal to or longer than the detection width W3 from the sudden change point 105, whereby the sudden change point 105
Is determined to be the side end 34 of the steel plate 17 in step g10, and erroneous detection due to the noise 104 can be prevented.

This means that the sensor S of the third detecting means 23
The same applies to the side end 35 detected by the sensor 31, and also to the side end 37 detected by the sensor S21 of the second detection means 22. The outputs of the encoders EN11, EN22 and EN31 of these side ends 34, 35 and 37 are stored in the memory 97. The lateral bending amount C of the steel plate 17 is calculated based on Expression 1 using these outputs.

The flatness F is calculated as follows based on the outputs of the sensors S21 to S25 of the second detection means 22 and the encoder EN21 stored in the memory 97. Referring to FIG. 3, the coordinates (X, Z) of all peaks 25, 26, 30,... And bottoms 28, 32,.
Is determined for each position in the width direction. The X axis is a coordinate position in the running direction 18 of the steel plate 17, and the Z axis is a vertical coordinate position perpendicular to the horizontal surface of the surface plate 14. Next, tangents 27, 31,... Between all peaks along the running direction 18 of the steel plate 17 are shown.
pull. Further, a perpendicular line is drawn on the bottom existing below each tangent line, and each peak height H1, H2,... Is obtained. The maximum mountain height H is searched for and obtained from the plurality of mountain heights thus obtained. Further, the wavelength L, which is the horizontal distance between the two peaks 26 and 30 from which the maximum peak height H2 is obtained, is determined, and the flatness F is determined by substituting the determined maximum peak height H and wavelength L into Equation 2. .

As described above, in the present embodiment, the sensor S21 of the second detecting means 22 is provided by the first and third detecting means 21,
After detecting the side end 37 of the steel plate 17 at the central position in the longitudinal direction of 23, the flatness F is detected. Therefore,
The sensor S21 is used for both the detection of the lateral bending amount C and the detection of the flatness F.

As described above, according to the present invention, the lateral bending amount C and the flatness F of the steel plate 17 can be detected by detecting the distance from the sensor to the surface of the platen 14 or the surface of the steel plate 17. Sensors can be shared. Therefore, the configuration can be simplified. Further, the lateral bending amount C and the flatness F of the steel plate 17 can be simultaneously detected by one device. Further, since the lateral bending amount C and the flatness F of the steel plate 17 can be automatically obtained, the shape of the steel plate 17 can be efficiently measured in a short time.

In the present embodiment, when the state in which the distance between the sensor and the surface of the platen 14 or the surface of the steel plate 17 deviates from the predetermined discrimination level continues for a predetermined length or more in the width direction, the side end of the steel plate 17 However, when the noise is small, the side edge of the steel plate 17 is detected even if the state deviating from the threshold value does not continue for a predetermined length in the width direction. You may judge that it was done. In addition, the effective measurement width W2 including the side end of the steel plate 17
Is set in advance, and the movement speed of the sensor from the reference straight line to the effective measurement width W2 is set to be higher than the movement speed of the sensor within the effective measurement width. The configuration need not be used. Further, the configuration of the first to third detection means 21, 22, and 23 is not limited to the configuration of the present embodiment, and may be another configuration.

[0056]

As described above, according to the first aspect of the present invention, since the sensor can be shared, the structure can be simplified. Further, the lateral bending amount C and the flatness F of the metal plate can be simultaneously detected by one apparatus. Further, since the lateral bending amount C and the flatness F of the metal plate can be automatically obtained, the shape of the metal plate can be measured efficiently and in a short time.

According to the second aspect of the present invention, the distance between the sensor and the surface of the surface plate or the metal plate is detected. When the sensor reaches the side end of the metal plate, the detected distance becomes equal to the distance of the metal plate. The side edge of the metal plate can be detected by detecting the change in the detected distance because the distance becomes shorter by the plate thickness. This makes it possible to detect the widthwise distance between the reference straight line and the side edge of the metal plate at three places in the length direction of the metal plate, so that the lateral bending amount C of the metal plate can be automatically calculated.

According to the third aspect of the present invention, when the state in which the distance between the sensor and the surface of the surface plate or the metal plate deviates from the predetermined discrimination level continues for a predetermined length or more in the width direction, Since it is determined that the side edge of the plate has been detected, it is possible to reliably prevent erroneous detection of the side edge of the metal plate due to noise and foreign matter.

According to the fourth aspect of the present invention, the effective measurement area including the side edge of the metal plate is predetermined, and the moving speed of the sensor from the reference straight line to the effective measurement area is within the effective measurement area. Since the speed is set higher than the moving speed, the time required for the sensor to reach the effective measurement area can be shortened, and the side edge of the metal plate can be quickly detected.

According to the fifth aspect of the present invention, by providing the first, second and third detecting means, the flatness F and the amount of lateral bending C can be obtained by the calculating means. That is, the flatness F is determined by the output of the second detecting means.
Is calculated, and the amount of lateral bending C is calculated using the respective outputs of the first, second and third detecting means. In this way, the output of the second detecting means is calculated as the relationship between the amount of lateral bending C and the flatness F. Since both can be used for measurement, the configuration can be simplified, and the shape of the metal plate can be automatically measured.
Further, since the second detecting means measures the lateral bending amount C before the measurement of the flatness F, the second detecting means detects the side edge 3 of the metal plate by the sensor S21.
7, so that the sensor can be arranged with reference to the side end position when measuring the flatness F. Therefore, even if the metal plate is meandering, the second detection means can reliably detect the flatness by arranging the sensor on the metal plate.

According to the present invention, the side edges 34, 37, 35 of the metal plate can be accurately detected by the sensors of the first, second and third detecting means without erroneous detection. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a steel sheet shape measuring apparatus 13 according to an embodiment of the present invention.

FIG. 2 is a plan view of the steel plate 17 for explaining a definition of a lateral bending amount C of the steel plate 17;

FIG. 3 is a diagram schematically illustrating a surface 24 of a steel plate 17 for explaining the definition of the flatness F.

FIG. 4 is a front view of the first detection unit 21 shown in FIG.

FIG. 5 is a plan view of a second detection unit 22 shown in FIG.

FIG. 6 is a front view showing a part of the detection body 67 shown in FIG.

7 is a plan view of the sensor moving unit 77 shown in FIG.

FIG. 8 is a block diagram showing an electrical configuration of a steel plate shape measuring device 13 according to an embodiment of the present invention.

FIG. 9 is a flowchart for explaining the overall operation of the processing circuit 94 shown in FIG. 8;

FIG. 10 is a diagram showing an output waveform when the sensor S11 of the first detection means 21 moves in the movement direction 60.

11 is a simplified plan view of a part of the steel plate 17. FIG.

FIG. 12 shows a side end 3 of the steel plate 17 by the first detecting means 21.
6 is a flowchart for explaining the operation of the processing circuit 94 for detecting the number 4.

[Explanation of symbols]

 13 Steel Plate Shape Measuring Device 14 Surface Plate 17 Steel Plate 21 First Detecting Means 22 Second Detecting Means 23 Third Detecting Means 44 Base 45 Arm 58,77 Sensor Moving Means 61,72,89 Motor 67 Detector 68 Mount 69 1 guide rail 71 traveling body 75 second guide rail 81 moving member 82 third guide rail 83 elevating displacement means 84 gripping member 85 engaging concave part 86 engaging convex part 92 traveling body driving means 94 processing circuit 95 input means 96 push button 97 memory

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Yoshikazu Fujito 5th Ishizu Nishimachi, Sakai City, Osaka Prefecture Nisshin Steel Co., Ltd. Sakai Works (72) Inventor Junichi Matsumoto 21 Misonocho, Amagasaki City, Hyogo Prefecture Sumikin Control Engineering F term (reference) 2F069 AA54 AA68 BB19 BB34 CC06 DD08 DD15 DD16 DD27 GG04 GG06 GG07 GG39 GG52 GG56 GG58 GG77 HH09 HH11 JJ02 JJ13 JJ25 MM04 MM11 MM17 MM34 PP06 QQ05

Claims (6)

[Claims] At three predetermined detection positions in the longitudinal direction of the metal plate, distances to the surface of the metal plate are detected along the width direction of the metal plate corresponding to the positions in the width direction, respectively. Along the longitudinal direction of the metal plate, the distance to the surface of the metal plate corresponding to the position in the longitudinal direction is detected at each of a plurality of positions in the width direction of the metal plate; Calculating the lateral bending amount C of the metal plate based on the distance detected along the width direction of the metal plate, and calculating the flatness F of the metal plate based on the distance detected along the longitudinal direction of the metal plate. Of measuring the shape of the metal plate to be used. 2. A metal plate is placed on a surface plate having a horizontal surface, and the three detection positions are predetermined outside a metal plate on a reference straight line extending in a longitudinal direction of the metal plate. A sensor that detects the distance to the surface of the surface plate or metal plate is placed above, and the sensor is moved along the width direction of the metal plate. When the distance to the surface of the metal plate is detected and the detected distance deviates from a predetermined discrimination level, it is determined that the side edge of the metal plate has been detected, and
2. The lateral bending amount C of the metal plate is calculated based on the distance from the reference straight line of the side edge of the metal plate at each of the detected positions, and the detected distance from the reference straight line. Method for measuring the shape of a metal plate. 3. When the distance between the sensor and the surface of the platen or the surface of the metal plate deviates from a predetermined discrimination level and continues for a predetermined length or more in the width direction, a side edge of the metal plate is detected. 3. The method according to claim 2, wherein the determination is made. 4. When the sensor is moved along the width direction of the metal plate and the distance between the sensor and the surface plate or the surface of the metal plate is detected in accordance with the position of the sensor in the width direction, the side edge of the metal plate is moved. The effective measurement area including the predetermined measurement area is set in advance, and a moving speed of the sensor from the reference straight line to the effective measuring area is set to be higher than a moving speed of the sensor in the effective measuring area. Method for measuring the shape of a metal plate. 5. At a predetermined position in the longitudinal direction of the metal plate,
Along the width direction of the metal plate, a first detection means for detecting a distance to the surface of the metal plate corresponding to a position in the width direction; And a second detecting means for detecting a distance to the surface of the metal plate corresponding to the position in the longitudinal direction at each of a plurality of positions in the width direction of the metal plate, from the first and second detecting means. A third detecting means for detecting a distance to the surface of the metal plate along the width direction of the metal plate corresponding to a position in the width direction along the width direction of the metal plate; A calculating means for calculating a lateral bending amount C and a flatness F in response to an output of the detecting means. 6. The arithmetic unit includes a state in which a distance detected by each of the first, second, and third detection units deviates from a predetermined discrimination level while the sensors move in the width direction of the metal plate. Is determined to have been detected when the side edge of the metal plate has been detected, and the output of each sensor position detecting means when the side edge of the metal plate has been detected determines the amount of lateral bending C. The apparatus for measuring the shape of a metal plate according to claim 5, wherein the calculation is performed.