JP4038286B2 - Thickness detection device for plate processed products - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thickness detection apparatus for detecting a dimension in the thickness direction during a processing step of a plate-like processed product.
[0002]
[Prior art]
Until now, there has been no device for detecting foreign matter such as dust or abnormalities associated therewith even if foreign matter such as dust adheres to the plate-like processed product during the press working.
[0003]
Therefore, in order to detect that foreign matter has adhered, it has been necessary to visually inspect after press working. In addition, when a portion to which foreign matter or the like is attached is found, a means has been used such as measuring the thickness of the plate-like processed product using a measuring device such as a micrometer to confirm the abnormality.
[0004]
[Problems to be solved by the invention]
However, as described above, when a portion to which foreign matter such as dust is attached is measured with a micrometer or the like, the portion to which the foreign matter is attached is crushed, and the thickness of the attached portion cannot be measured accurately. An error is caused by the measurer and the measuring device. Also, if there are a large number of plate-like processed products to be pressed and a large amount of foreign matter adheres to them, or if random foreign matter adheres randomly, the total number is visually inspected to find the exact location. It was difficult.
[0005]
The present invention is capable of accurately detecting when a dimension in the thickness direction of a plate-like processed product changes due to adhesion of foreign matters such as dust to the plate-shaped processed product, and provides a thickness detection device with excellent detection accuracy. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the first and second aspects of the present invention provide a workpiece cradle that abuts one surface of a plate-like workpiece during the machining step, and the abutment on the workpiece cradle. A pressing plate that reciprocates in a direction perpendicular to the surface to be brought and is biased to press the plate-like workpiece, and the pressing surface abuts along the other surface of the plate-like workpiece Therefore, at least a plurality of dimensions related to the distance between the pressing plate that allows the degree of parallelism with the other surface to be adjusted, and the surface of the workpiece receiving plate and the pressing surface of the pressing plate are at least near the periphery of the plate-shaped workpiece. And a measuring means for measuring a part corresponding to the part.
Therefore, if dust or the like adheres to the surface of the plate-like processed product, the pressing surface of the pressing plate does not directly contact the plate-like processed product at that portion, but is in contact with the dust or the like in the pressing direction. On the other hand, the other parts move until they directly contact the surface of the plate-like workpiece, so that the pressing surface of the holding plate is no longer parallel to the surface of the workpiece cradle. Is detected by at least one of the following.
[0007]
Further, the invention according to claim 1 and claim 2 related thereto is that the plate being processed when the dimension measured at any of the plurality of locations by the measuring means exceeds a predetermined allowable value for the predetermined dimension. And determining means for determining an abnormal value of the dimension in the thickness direction for the processed product.
[0008]
Therefore, the measured dimension is compared with a predetermined allowable value, and the dimension in the thickness direction is evaluated.
[0009]
According to a third aspect of the present invention, the measuring means according to the first aspect comprises an eddy current type displacement sensor, the dimension in the orthogonal direction between the reference surface of the sensor head and the surface of the workpiece receiving base is regulated, and the reference The surface is placed outside the peripheral edge of the plate-like product with the pressing surface of the pressing plate facing the pressing plate, and at least the portion of the pressing surface facing the sensor head is constituted by a conductive surface.
Therefore, the eddy current is changed in accordance with the change in the distance between the reference surface of the sensor head and the pressing surface of the pressing plate, and the distance is detected, and the same detection and evaluation as in claim 1 is performed.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a simplified diagram showing the processing steps of the present invention. In the figure, 1 is a press machine for processing a plate material, and 2 is a metal mold for processing. 3 is a plate material to be processed. In this case, for example, it is made of a synthetic resin material having a strip shape of about 100 μm thickness obtained by bonding an adhesive of about 20 μm thickness to polyethylene of about 80 μm thickness, and is wound around the reel 4. Thus, the press machine 1 sequentially supplies the press machine 1 with the press work. This processing step is completed in seven press operations in this embodiment. Reference numeral 5 denotes a pressed plate-like processed product. The plate material 3 (plate-like processed product 5) after being pressed is sequentially wound around the reel 6. Reference numeral 7 denotes a thickness detection apparatus of the present invention, which detects the dimension in the thickness direction of the plate-like processed product 5 in the process in which the processing is completed. The plate material for processing according to the present embodiment is a synthetic resin material, but is not limited thereto.
[0011]
FIG. 2 is a cross-sectional view showing an embodiment of the thickness detecting device 7 for the plate-like workpiece 5 according to the present invention, and shows a state seen from the side with respect to FIG. The thickness detector 7 is attached to a detector cradle 8 that is integral with the main body of the press machine 1. Reference numeral 9 denotes a workpiece receiving base on which the plate-like processed product 5 is brought into contact during the processing step. It is in contact. Reference numeral 10 denotes a press operating portion that is linked to the press working operation, and an operating shaft mounting base 12 is fixed to the press operating plate 11.
[0012]
Reference numeral 13 denotes a pressing plate for pressing the plate-shaped processed product 5 on the processed product receiving base 9, and an operation shaft 14 is integrally attached thereto. The operating shaft 14 is slidably penetrated through the through hole 16 of the mounting frame 15 integral with the detection device cradle 8 and is in contact with the contact surface 9A of the workpiece cradle 9 in conjunction with the press working operation. Reciprocate in the orthogonal direction. There is a gap g having a diameter of about 5 μm between the operating shaft 14 and the through hole 16, and the pressing surface 13 </ b> B is in contact with the other surface 5 </ b> B of the plate-like workpiece 5. The degree of parallelism with is adjustable.
[0013]
Reference numeral 17 denotes a spring that urges the operating shaft 14 toward the plate-like processed product 5 so that the presser plate 13 presses the plate-like processed product 5, and is attached to the spring shaft 18 so as to be extendable and retractable. Is fixed to the press operating plate 11, and the lower end is locked to the spring locking portion 18A of the spring shaft 18, and the operating shaft 14 is constantly biased downward. The operating shaft 14 is linked to the upward movement of the press operating portion 10 with its head portion 14A locked to the operating shaft mounting base 12 and unlocked by the downward movement. The pressing plate 13 is pressed by the spring 17 and presses the plate-like workpiece 5 by the spring force.
[0014]
19A and 19B are eddy current type displacement sensors that detect the dimensions related to the distance between the contact surface 9A of the workpiece receiving base 9 and the pressing surface 13B of the pressing plate 13 in a non-contact manner. It is installed in two places on the side of the processed product 5 in the vicinity of the periphery, and the distance is measured with an accuracy of 1 μm. The eddy current type displacement sensors 19A and 19B are restricted in the dimensions in the orthogonal direction between the reference surfaces A or B of the sensor heads 20A and 20B and the contact surface 9A of the workpiece receiving base 9 (in this case, The reference surfaces A and B are disposed on the outer side of the peripheral edge of the plate-like processed product 5 with the reference surfaces A and B facing the pressing surface 13B of the pressing plate 13.
[0015]
On the other hand, an aluminum foil 21 is affixed to the pressing surface 13B at a position facing the sensor heads 20A and 20B to form a conductive surface. When a conductive material is used for the pressing plate 13, the aluminum foil 21 is not necessary. The eddy current type displacement sensors 19A and 19B form a magnetic field between the pressing plate 13 and detect the interval by changing the electromagnetic induction due to the change in the interval at each part.
[0016]
The eddy current displacement sensors 19A and 19B and the aluminum foil 21 are the measuring means of the present invention.
[0017]
Although not shown, in the thickness detection device 7, when the dimension measured by any of the eddy current displacement sensors 19A and 19B exceeds a predetermined allowable value with respect to the predetermined dimension, the determination unit is activated, It is determined that the dimension in the thickness direction is abnormal with respect to the plate-like processed product 5 being processed. In this case, the press machine 1 is stopped as necessary, and the plate-like processed product 5 is sorted as a defective product.
[0018]
The operation of the above configuration will be described below. FIG. 3 is a simplified configuration diagram showing an operation example by the thickness detection apparatus of the present invention. When a foreign substance D such as dust or pressed dust is attached to the plate-like processed product 5 near the one side edge, the pressing plate 13 is in contact with the plate-shaped processed product 5 while being pressed. Since it is away from the other surface of the plate-like processed product 5, it is inclined with respect to the contact surface 9A of the processed product receiving base 9 as shown in FIG. Therefore, the gap G1 between the pressing surface 13B of the holding plate 13 and the reference surface A of the eddy current displacement sensor 19A is larger than the gap G2 between the reference surface B of the eddy current displacement sensor 19B.
[0019]
Since the gap G1 is larger than the thickness C of the plate-like processed product 5, when the difference from the thickness C exceeds a predetermined allowable value, it is detected as an abnormal value. When this is detected, there is a risk that the plate-like processed product 5 has foreign matter D attached thereto, or is damaged by foreign matter D or the like, or the thickness of the material is uneven due to burrs or the like caused by pressing. Therefore, the press machine 1 is stopped as necessary.
[0020]
In this embodiment, the pressing plate 13 reciprocates in the direction orthogonal to the contact surface 9A of the workpiece receiving base 9 in conjunction with the pressing operation of the press machine 1. A similar reciprocating operation may be performed separately from the operation. Further, although the pressing plate 13 is swingable together with the operating shaft 14, the pressing plate 13 may be swingable with a hinge structure between the operating shaft 14 and the main body of the pressing plate 13.
[0021]
FIG. 4 is a simplified configuration diagram showing another operation example of the thickness detection apparatus of the present invention. When the foreign matter D is attached to substantially the center of the plate-like processed product 5 and is on the operating shaft 14 (see FIG. 2) line, the pressing plate 13 is in contact with the plate-like processed product 5 in a pressed state. Since it leaves | separates from the other surface of the plate-shaped workpiece 5, as shown in the figure, without inclining with respect to the contact surface 9A of the workpiece receiving base 9, with respect to the pressing surface 13B of the pressing plate 13, The gaps G1 and G2 between the reference surfaces A and B of the eddy current type displacement sensors 19A and 19B are larger than the thickness C of the plate-like workpiece 5.
[0022]
When the difference between the gap G1 or G2 and the thickness C exceeds a predetermined allowable value, it is detected as an abnormal value. Similarly, when this is detected, the press machine 1 is stopped as necessary.
[0023]
When the foreign matter D is not attached, the pressing plate 13 presses the entire surface of the plate-like processed product 5, and the detection values by the eddy current displacement sensors 19A and 19B are within a predetermined allowable value. Therefore, the process is continued in a steady state.
[0024]
【The invention's effect】
According to the invention of claim 1 or claim 3 and claim 4 related thereto, the degree of parallelism with the other surface so that the pressing surface of the pressing plate abuts along the other surface of the plate-like processed product. Since it is adjustable, when a foreign object is attached to the other surface, the pressing surface of the holding plate and the surface of the workpiece receiving base are not parallel, or the foreign material etc. The gap becomes larger and is accurately detected by the measuring means (at least one of the eddy current type displacement sensors).
[0025]
According to the invention of claim 2 or claim 3 and claim 4 related thereto, when a dimension measured at any of a plurality of locations by the measuring means exceeds a predetermined allowable value for the predetermined dimension. Further, since the plate-like processed product being processed is provided with a determination means for determining an abnormal value in the thickness direction dimension, the dimension in the thickness direction is accurately evaluated.
[Brief description of the drawings]
FIG. 1 is a simplified diagram showing a processing step of the present invention.
FIG. 2 is a cross-sectional view showing an embodiment of a thickness detection device for a plate-like workpiece according to the present invention.
FIG. 3 is a simplified configuration diagram showing an operation example by the thickness detection apparatus of the present invention.
FIG. 4 is a simplified configuration diagram showing another operation example by the thickness detection apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Press machine 2 Metal mold | die 3 Plate material 5 Plate-shaped processed product 7 Thickness detection apparatus 9 Processed product base 13 Holding plate 14 Operating shaft 16 Through-hole 17 Spring 19A, 19B Eddy current type displacement sensor (measuring means)
21 Aluminum foil

Claims (3)

A workpiece cradle that abuts one surface of the plate-like workpiece during the machining process;
A pressing plate that reciprocates in a direction orthogonal to the surface of the workpiece receiving base that is brought into contact with the plate and is biased to press the plate-like workpiece, the pressing surface being a plate-like workpiece The holding plate that allows the degree of parallelism with the other surface to be adjusted so as to abut along the other surface of
Measuring means for measuring the dimensions related to the distance between the surface of the workpiece cradle and the pressing surface of the pressing plate, corresponding to at least a plurality of locations outside the periphery of the plate-like workpiece,
Judgment to determine an abnormal value of the dimension in the thickness direction for the plate-like workpiece being processed when a dimension measured at any of the plurality of locations exceeds a predetermined allowable value for the predetermined dimension Means and
When the foreign matter adheres to a position deviated with respect to the center of the presser plate, the presser plate comes into contact with the foreign matter and tilts with respect to the workpiece support to press the plate-like processed product. Thickness detection device for plate-like products.   The thickness detection device for a plate-like workpiece according to claim 1, wherein the measuring means is a non-contact displacement sensor.   The measuring means comprises an eddy current displacement sensor, the dimension of the sensor head reference surface and the surface of the workpiece pedestal are restricted in the orthogonal direction, and the reference surface is opposed to the pressing surface of the pressing plate. The thickness of the plate-like workpiece according to claim 1, wherein the plate-like workpiece is disposed outside a peripheral edge of the plate-like workpiece, and at least a portion of the pressing surface facing the sensor head forms a conductive surface. Detection device.

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