JPH1019550A - Method for measuring warp of plate material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring warp of a plate material wherein the amount of warp of the plate material is measured with precision and quickly. SOLUTION: With three distance sensors 13a, the distances form three points in the longitudinal direction of a bimetal 1 are measured. Based on the measurement value of the distance sensors 13a at both ends, an prediction value is obtained by predicting, in linear manner, a measurement value of the distance sensor 13a at the center with an assumption that the bimetal 1 is flat. The difference between the predicted value and the actually measured value with the distance sensor 13a at center is used as an evaluated value of warping amount of the bimetal 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the warpage of a plate having a predetermined length in the thickness direction.

[0002]

2. Description of the Related Art Generally, in a breaker, a bimetal is used for detecting an overcurrent slightly larger than a rated current. At present, this type of bimetal is a plate material, and is manufactured by unwinding and supplying a hoop material, straightening it into a flat shape by a leveler, and then cutting it to a predetermined length by a cutting machine.

[0003]

By the way, a plate material such as a bimetal used for a breaker has a great influence on the operating characteristics of the breaker if the flatness is different, so that the flatness must be grasped. . This is an important factor to control the amount of warpage in the case of a plate material that cooperates with other members as well as the bimetal.

However, as a method of detecting the warpage of the plate material, the amount of warpage of the plate material is currently determined by visual inspection or actually measured manually, and the amount of warpage cannot be accurately grasped. There has been a problem that the measurement work is troublesome. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for measuring the warpage of a plate, which can accurately and quickly measure the amount of warpage of the plate.

[0005]

According to a first aspect of the present invention, in order to achieve the above object, three or more distance sensors are disposed opposite to a plate member having a predetermined length, and two distance sensors are used. Distance sensors are arranged in such a manner that at least one distance sensor is arranged at an intermediate portion of a connecting line segment. Obtain a predicted value obtained by linearly predicting a measured value at a distance sensor located at a distance, and evaluate a difference between the measured value actually measured at a distance sensor located at an intermediate portion of the line segment and the predicted value as an evaluation value of the amount of warpage of the plate material. That is.

According to this method, three or more distance sensors are arranged on a line segment in the direction in which the amount of warpage is to be evaluated, and based on the measured values of the distance sensors located at both ends of the line segment. Linearly predicts the measured value of the other distance sensor when the plate material is assumed to be a flat plate to obtain a predicted value, and evaluates the amount of warpage based on the difference between the measured value measured by the other distance sensor and the predicted value. In addition, even when the plate material to be measured is inclined with respect to the line segment, the influence of the inclination can be removed to evaluate the amount of warpage. In this way, the amount of warpage of the plate material can be evaluated without using visual measurement or manual work,
The amount of warpage of the plate material can be evaluated reliably and in a short time.

According to a second aspect of the present invention, in the first aspect of the invention, the three distance sensors are arranged in the longitudinal direction of the plate. In general, a plate material is easily bent in the longitudinal direction, and therefore, by evaluating the amount of warpage in the longitudinal direction, the portion of the plate material having the largest warp can be evaluated. According to a third aspect of the present invention, in the first or second aspect of the invention, the three distance sensors are arranged at regular intervals.

In this method, since the predicted value obtained by linear prediction is an average value of the measured values of the two distance sensors, the calculation is easy, and the amount of warpage is evaluated by a relatively small number of distance sensors. Can be. According to a fourth aspect of the present invention, in the first to third aspects, the distance sensors have the same specifications.

According to this method, even if the material of the plate material is different, the tendency of the change of the measured value of each distance sensor with respect to the material of the plate material is the same, so that even if the material of the plate material is different, the amount of warpage can be correctly evaluated.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the following, a bimetal is exemplified as a plate material, and an example in which feedback control of a leveler is performed based on a measurement result is shown. However, the plate material is not necessarily limited to the bimetal. It is not particularly limited. FIG. 2 shows an apparatus for manufacturing the bimetal 1 using the method of the present invention. The bimetal 1 is supplied as a hoop material 2, rewinded by an uncoiler (not shown), introduced into a leveler 11, and corrected into a flat plate shape. Thereafter, the bimetal 1 is cut into a predetermined length by a press type cutting machine 12. As shown in FIG. 3, the bimetal 1 is conveyed while being mounted on a synthetic resin gantry 4 set on a conveyor 5, and the amount of warpage is measured by a warpage measuring device 13. By placing the bimetal 1 on the fixed position of the gantry 4 in this manner, the direction of the bimetal 1 with respect to the warpage measuring device 13 becomes constant, and the reliability of the measurement result increases. Further, the amount of warpage obtained by the warpage measuring device 13 is transferred to the control device 14 and controls the driving device 15 provided in the leveler 11.

The leveler 11 is formed by arranging a large number of flat rolls 11a in a staggered manner in contact with both sides in the thickness direction of a plate material 3 obtained by unwinding a hoop material 2. By adding, the plate material 3 is corrected into a flat plate shape. The flat roll 11b provided on the exit side of the leveler 11 has a housing 11c so as to be movable in the thickness direction of the plate material 3.
Is held. That is, a vertical screw shaft 11d is inserted into the housing 11c, and a pedestal 11e holding the flat roll 11b is coupled to a lower end of the screw shaft 11d.
When the pulley 15a screwed to the upper end of the screw shaft 11d rotates, the screw shaft 11d moves up and down according to the rotation direction of the pulley 15a. The upper and lower positions of the flat roll 11b are adjusted according to the rotation direction of the pulley 15a, and the amount of warpage of the plate material 3 pulled out from the leveler 11 is adjusted.

The warp measuring device 13 includes three distance sensors 1
A measuring head 13b having 3a mounted on a support 13d;
An operation unit 13c for evaluating the amount of warpage by integrating the measured values of the measuring heads 13b. A high frequency oscillation type proximity sensor is used as the distance sensor 13a. In other words, the distance sensor 13a has a built-in high-frequency oscillation circuit, and detects a distance to the metal object by detecting an eddy current loss or a change in inductance of the oscillation coil generated when the oscillation coil is brought close to the metal object. The distance sensors 13a are arranged on a single plane in a straight line in the longitudinal direction of the bimetal 1. The distance sensors 13a are arranged at equal intervals. Here, FIG.
As shown in the figure, the bimetal 1 is placed at a fixed position on the gantry 4, the tip surfaces of a pair of projections 4a and 4b provided on the gantry 4 are in contact with the support 13d, and the projections provided on the measuring head 13b. 13e is inserted between the protrusions 4a and 4b of the gantry 4, whereby the gantry 4 and the measuring head 13b are positioned, and the relative position between the bimetal 1 and the measuring head 13b is maintained in a constant relationship. You can do it. In other words, the measurement conditions for each bimetal 1 can be made substantially constant, and the reliability of the measurement results increases.

The arithmetic unit 13c calculates the difference between the average value of the measured values of the two distance sensors 13a at both ends and the measured value of the remaining distance sensors 13a. Bimetal 1
Is flat in the longitudinal direction, the distance sensor 13a
Even if the bimetal 1 is inclined with respect to the plane on which is disposed, since the average value of the measured values of the distance sensors 13a at both ends coincides with the measured value of the central distance sensor 13a, it was obtained by the arithmetic unit 13c. The difference between the two measurements is almost zero. If the bimetal 1 is warped, the difference between the two measured values increases as the warpage increases. Therefore, the difference between the two measured values obtained by the arithmetic unit 13c can be used as an evaluation value of the amount of warpage.

The control device 14 includes a process management device 14a using a personal computer, a sequencer (using a programmable controller) 14b for controlling each equipment unit, and a driver for controlling the driving device 15 by the output of the sequencer 14b. 14c. The process management device 14a functions as a higher-level computer of the sequencer 14b, and provides information to the sequencer 14b according to the production plan. The sequencer 14b provides the process management device 14a with the progress of the equipment and the presence or absence of an abnormality.

The controller 14 according to the present invention has a function of determining the amount of operation to be given to the drive device 15 based on the amount of warpage obtained by the arithmetic unit 13c. 14b
In the sequencer 14b, the drive device 15 is controlled in accordance with the operation amount. The driving device 15 includes a servomotor 15c coupled to the above-described pulley 15a by a belt 15b, and the servomotor 1 according to an operation amount given from the sequencer 14b through a driver 14c.
5c is rotated. That is, the sequencer 14b gives the rotation direction and the rotation angle of the servomotor 15c as the operation amounts. By this operation, the position of the flat roll 11b is adjusted.

In short, the position of the flat roll 11b is adjusted based on the measured value of the amount of warpage of the bimetal 1, and the flat roll 11b is moved in the direction in which the bimetal 1 approaches the flat plate.
Will be adjusted. In some cases, the amount of warpage is adjusted so as to fall within a predetermined range from a desired reference value. The amount of warpage is measured for each bimetal 1. However, even if the position of the flat roll 11b is immediately adjusted based on the measurement result of the amount of warpage for each bimetal 1, the position of the flat roll 11b is adjusted. Since the plate material 3 that later passes through the flat roll 11b is not the same as the bimetal 1 whose warpage has been measured, there is little significance in quick feedback control. In addition, since the measurement results of the individual bimetals 1 have some variations, even if feedback control including such variations is performed, it does not necessarily lead to improvement in the flatness of the bimetals 1. Therefore, in the present embodiment, the amount of operation to be given to the servomotor 15c is determined based on the average value of the measurement results for 100 bimetals 1 (this value can be changed as needed).

In the above-described embodiment, the distance sensor 13a
Uses a high-frequency oscillation type proximity sensor,
Any type that has conventionally been provided for measuring distance, such as a type that performs triangulation optically using a position sensor such as D or a type that performs contact-type measurement using a differential transformer , Any one may be used. However, in order to perform the measurement in a short time without damaging the bimetal, it is desirable to use a non-contact type.

In the above embodiment, the three distance sensors 1
Although the distance sensors 3a are arranged at equal intervals, the distance sensors 13a do not necessarily have to be arranged at equal intervals, and the number of distance sensors 13a arranged on one straight line may be three or more. If the distance sensors 13a are not arranged at regular intervals, the bimetal 1
And the difference between the predicted value that is linearly predicted to be obtained by the remaining distance sensor 13a when the bimetal 1 is assumed to be a perfect flat plate and the measurement value actually measured by the remaining distance sensor 13a. Should be obtained. Now
As shown in FIG. 1, the measurement of the distance sensors 13a and a _1, a _2, a ₃ from left to right, d ₁ by a distance sensor 13a of the left and center, the distance between the center and the right end sensor 13
When the distance between a and d _2, the predicted value of the measurement values obtained at the center of the distance sensor 13a when the bimetal 1 and the flat plate _{is, a 1 + (a 3 -a} 1) d 1 / (d 1 + d 2 ), This value and the measured value a ₂ of the central distance sensor 13a
Is obtained, an evaluation value relating to the amount of warpage of the bimetal 1 can be obtained.

As is clear from the above description, since the distance sensors 13a do not need to be arranged at equal intervals, the amount of warpage can be evaluated by four or more distance sensors 13a. Three or more distance sensors 13a may be arranged on a plurality of straight lines, respectively, to evaluate the amount of warpage of the plate in various directions. When four or more distance sensors 13a are arranged on a straight line, the sum of the difference between the predicted value obtained from the measured values of the distance sensors 13a at both ends and the measured value actually measured by each of the distance sensors 13a at the intermediate portion is calculated. What is necessary is just to use it for the evaluation value of the amount of warpage. However, it is desirable that the distance sensors 13a constituting the measuring head 13b have the same specifications. In other words, by using the distance sensor 13b having the same specification, even when the material of the plate material is different, the output of the specific distance sensor 13a constituting the measuring head 13b does not respond differently from other distance sensors 13a. The amount of warpage can be measured regardless of the material of the plate material.

[0020]

According to the first aspect of the present invention, at least one distance sensor is provided at an intermediate portion of a line connecting two distance sensors, using three or more distance sensors arranged to face a plate member of a predetermined length. The distance sensor is arranged in the form of arranging sensors, and assuming that the plate material is a flat plate, the prediction value obtained by linearly predicting the measurement value of the distance sensor located at the middle part of the line segment from the measurement value of the distance sensor at both ends of the line segment Is calculated, and the difference between the measured value and the predicted value measured by the distance sensor located in the middle of the line segment is used as the evaluation value of the amount of warpage of the sheet material. When three or more distance sensors are arranged and the plate material is assumed to be a flat plate, the values measured by the other distance sensors are linearly predicted based on the values measured by the distance sensors located at both ends of the line segment. To obtain the predicted value, and the measured value actually measured by another distance sensor Since the amount of warpage is evaluated based on the difference from the predicted value, there is an advantage that even if the plate to be measured is inclined with respect to the line segment, the influence of the inclination can be removed and the amount of warpage can be evaluated. Since the amount of warpage of the plate material can be evaluated without using any manual work, there is an effect that the amount of warpage of the plate material can be evaluated reliably and in a short time.

According to a second aspect of the present invention, the distance sensor is
If the individual pieces are arranged in the longitudinal direction of the sheet material, the sheet material is generally easily bent in the longitudinal direction. Therefore, by evaluating the amount of warpage in the longitudinal direction, it is possible to evaluate the portion of the sheet material having the largest warpage. If the three distance sensors are arranged at regular intervals as in the invention of claim 3, the calculation is easy because the prediction value obtained by linear prediction becomes the average value of the measurement values of the two distance sensors. There is an advantage that the amount of warpage can be evaluated with a relatively small number of distance sensors.

According to the fourth aspect of the present invention, if the distance sensors have the same specifications, even if the material of the plate material is different, the tendency of change in the measured value of each distance sensor with respect to the material of the plate material becomes the same. There is an advantage that the amount of warpage can be correctly evaluated even if the materials are different.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a measurement principle of the present invention.

FIG. 2 is a schematic configuration diagram showing a usage example of the present invention.

FIG. 3 is a perspective view of a main part of the configuration shown in FIG. 2;

[Explanation of symbols]

 1 bimetal 13 warpage measuring device 13a distance sensor

Claims (4)

[Claims] 1. A distance in which at least one distance sensor is arranged at an intermediate portion of a line connecting two distance sensors, using three or more distance sensors arranged to face a plate member of a predetermined length. Arrange the sensors, assuming that the plate material is a flat plate, to obtain a predicted value that linearly predicts the measured value of the distance sensor located at the middle part of the line segment from the measured value of the distance sensor at both ends of the line segment, A method for measuring the warpage of a sheet material, wherein a difference between a measured value actually measured by a distance sensor located at an intermediate portion of the line segment and the predicted value is used as an evaluation value of the amount of warpage of the sheet material. 2. The method according to claim 1, wherein the number of the distance sensors is three, and the distance sensors are arranged in a longitudinal direction of the plate. 3. The method according to claim 1, wherein the number of the distance sensors is three, and the distance sensors are arranged at equal intervals. 4. The method according to claim 1, wherein said distance sensors have the same specifications.