JP3306132B2 - 2D coordinate measuring machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing type two-dimensional coordinate measuring machine.

[0002]

2. Description of the Related Art As a two-dimensional coordinate measuring machine, a two-dimensional measuring object such as a printed circuit board is illuminated with light, and an outline (hereinafter, referred to as an edge) of the measuring object is defined by a difference in brightness of light. , An image of the object to be measured is taken by a CCD camera supported so as to be relatively movable in a two-dimensional direction with respect to the object to be measured,
This is image-processed, reproduced and displayed on a monitor device on the two-dimensional coordinates, and a coordinate pointing device (hereinafter referred to as a mouse) for specifying and specifying an arbitrary point on the monitor device is used to convert the reproduced image on the monitor device. 2. Description of the Related Art There is known an image processing system that calculates and measures the shape and dimensions of an object to be measured.

[0003] In this type of two-dimensional coordinate measuring machine, the object to be measured is, for example, a substantially planar object such as a precision sheet metal part, a printed wiring board, or an original artwork processed by a laser beam machine or a press. There is something. In this case, for example, in precision sheet metal parts, after punching various holes and outer shapes, post-processing such as bending is performed, and in a state of a semi-processed product before the post-processing is performed, A measurement is performed to check the processing state.

On the other hand, in the above-described sheet metal processed product, dimensions of each part after the bending process are important. Therefore, in a processed product including the bending process, for example, a design drawing is shown in FIG. The dimensions are specified in the state after the bending. The sheet metal processed product shown in FIG. 1 is obtained by bending a flat plate material into an L-shape, and has a bent portion 2 which is bent upward at an angle of about 90 degrees at one end of a base 1. A hole 3 is formed substantially at the center of the curved portion 2.

[0005] In this sheet metal product, the height of the bent portion 2 and the position of the hole 3 are important. Therefore, these heights B and C are specified from the bottom surface of the base 1. If such a sheet metal processed product is to be inspected in a semi-processed state before bending using the two-dimensional coordinate measuring machine described above, the measurement is performed in a state where the sheet metal processed product is unfolded as shown in FIG. Specifically, the total length L _{1, the} width L ₂ , the diameter R of the hole 2,
Measured the length L ₃ from the center of the hole 2 up to the folding line, and these measured values, the dimension A of the design drawing, B, C,
D is compared with D to determine the quality of processing. In this case, the sheet metal workpiece, in front of the bending, usually in consideration of the bending allowance of bending, since the cutting or punching of the outline has been performed, the total length L ₁ shown in FIG. 4, FIG. 3 is not a value obtained by adding the length dimension A and the height dimension B.

In FIG. 4, since the position of the bending line of the bent portion 2 does not appear on the blank, the length L ₃
Cannot be measured as it is. Therefore, conventionally, when measuring the length L _1, it calculates the difference between the length sum of the dimensions A and height B, incl bending margin of magnitude bending of this difference The quality of the processing is determined based on whether or not it is within a predetermined range.

For the height C of the hole 3, for example, a semi-finished product is erected on a surface plate, and a numerical value in consideration of the bending allowance for the height B is obtained and set to this numerical value. A marking line was drawn at a position corresponding to the bending line using a height gauge, and the length L3 from the marking line to the center of the hole ₃ was measured to determine the quality of the processing. However,
The following technical problems have been pointed out in the conventional means for determining the quality of a semi-finished product.

[0008]

That is, in the above-mentioned quality judgment means, the bending margin is calculated by hand, but the bending margin is calculated, for example, by the thickness, material, bending, etc. of the sheet metal product. Therefore, the operation for obtaining the bending allowance in consideration of these conditions has become very complicated. In addition, when a marking line is drawn, a marking line is individually formed on a measurement object, so that there is a problem that the work efficiency is poor and the measurement accuracy is reduced due to a variation in the marking work.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a two-dimensional coordinate measuring machine which can easily determine the quality of a semi-finished product. It is another object of the present invention to provide a secondary measuring device in which a decrease in measurement efficiency and accuracy is avoided.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for supporting a two-dimensional object to be moved in a two-dimensional direction parallel to a two-dimensional object to be measured, and defining an edge by a difference in brightness. A CCD camera that captures an image of an object to be measured and outputs the image as an electric image signal; an image memory that stores the image signal of the CCD camera; a monitor that reproduces and displays the object to be measured on two-dimensional coordinates; A coordinate pointing device for specifying and specifying an arbitrary point above, and performing predetermined image processing on an image signal stored in the image memory and outputting the processed signal to the monitor device; and a point specified and specified by the coordinate pointing device. Based on the edge, the edge of the measurement object is detected and the edge coordinate value on the monitor device is calculated, and the measurement value such as the shape and dimension of the measurement object is calculated based on the edge coordinate value. In a two-dimensional coordinate measuring machine having a central control device, the central control device has a bent portion to be post-processed on the object to be measured, and the dimension of the bent portion is designated in a state where the bent portion is bent. The specified dimension is corrected based on the bending allowance of the bent portion, and the corrected reference is displayed on the monitor device.
Virtual display on the measurement object shown
In addition, the quality is determined based on the correction value and the measurement value.

[0011]

[0012]

SUMMARY OF] According to the onset light of the above configuration, there bent portion is post-processed in the measurement object, when that is specified in a state in which the dimension is bending of the bending portion, bending The designated dimension is corrected based on the bending allowance of the part, and the pass / fail is determined by the centralized control device based on the corrected value and the measured value, so that troublesome manual calculation processing is not required.

Further, according to this onset bright, there is a processing unit bent measuring object to be post-processed, when the size is specified includes the bending portion from does not appear on the measurement object reference Then, the reference is corrected based on the bending allowance of the bent portion, and the corrected reference is virtually displayed by the centralized control device on the measurement target displayed on the monitor device, so that the virtual display is displayed on the monitor device. It is possible to directly measure the dimensions from the set reference and determine the quality.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show one embodiment of a two-dimensional coordinate measuring machine according to the present invention. The two-dimensional coordinate measuring machine shown in FIG. 1 includes a CCD camera 10 that captures an image of an object to be measured and outputs the image as an electric image signal;
An image memory 12 for storing an image signal of the CCD camera 10, a monitor device 14 including a CRT for reproducing and displaying the measurement object A on a two-dimensional coordinate axis (x, y),
A mouse 16 for specifying an arbitrary point on the monitor device 14
A printer 18 for printing out measured values, a centralized control device 20, and a memory 2 for storing control procedures of the control device 20.
2 and a keyboard switch 23 for inputting a predetermined signal to the central control device 20.

In this embodiment, the CCD camera 10 is mounted on a moving table that moves in a two-dimensional direction, and the position of the camera 10 in a coordinate system set on the moving table is determined by linearly moving the moving amount of the moving table. It is detected by the scale 24 and the detected value is constantly measured by counting it by the XY counter 26, and the measured value is input to the central control device 20.
Note that the CCD camera 10 is directly fixed to the two-dimensional coordinate measuring machine main body frame, and the object to be measured is moved in a two-dimensional direction on a movable table (XY table in the case where the CCD camera is directly fixed to the measuring machine main body frame). Alternatively, the moving amount may be detected by the linear scale 24, and the detected value may be constantly measured by counting the detected value with an XY counter.

The object to be measured is, for example, a substantially flat object such as a precision sheet metal part, a printed wiring board, or an original artwork plate processed by a laser processing machine or a press.
By projecting the illumination light beam from the back side or the front side, a contrast is created between the measurement object and the background part,
An edge portion is defined by the difference in brightness. Mouse 16
Has a pair of rotary length measuring sensors provided corresponding to the coordinate axes x and y of the monitor device 14 and a click switch. When the click switch is operated, the coordinate axes x and y of the monitor device 14 are changed. Any point on y is identified. The centralized control device 20 has a memory in which processing procedures and tables described later are stored, performs predetermined image processing on an image signal stored in the image memory 12, and outputs the processed image signal to the monitor device 14.

FIG. 2 shows an example of a control procedure executed by the central control device 20. In the two-dimensional coordinate measuring machine of the present invention, an object having a bent portion to be processed later is an object to be measured. In the following description, the object to be measured is shown in FIG. An example will be described with reference to FIG. When the control procedure of the centralized control device 20 starts, first, in step s1, the number N of measurement target parts is input, and one of the measurement target parts is selected.
Specifically, in the example shown in FIG. 4, the measurement site is the total length L _1,
Width L _2, holes 2 of to the center length L ₃ from the fold line, since the four places of the diameter R of the hole 2, N is set to 4,
For example, numbers 1 to 4 are assigned to the measurement sites in a serial number format.

In the following step s2, dimensions A to D on the design drawing for the selected measurement site are input.
Move to step s3. In step s3, it is selected whether or not a bent portion is included in the selected measurement site. If the measurement site does not include a bent portion (in the example shown in FIG. When L ₂ and the diameter R of the hole 2 are selected), step s
At 4, the measurement of the measurement site is performed.

[0019] In this measurement, performed by specifying an edge portion of the measurement site by the mouse 16 on the image displayed on the monitor device 14, for example, in the measurement of the overall length L _1, the left and right on the monitor device 14 When the edge is designated by the mouse 16, the length between the two points designated by the centralized control device 20 is calculated from the edge coordinate values of the designated two points, and the measured value is calculated by the two-dimensional coordinate measuring machine of the image processing system. Is required.

In this way, when the measured value is obtained,
In step s5, the measured values and the corresponding dimensions A to D on the design drawing are compared and calculated, and whether or not these differences are within a predetermined range determines whether the machining state is good or not,
Then, in step s6, the measured values and dimensions on the design drawing,
The judgment result is displayed on the monitor device 14 and the printer 1
8 and the process moves to step s7.

In step s7, it is determined whether or not the number N of the measurement sites is zero.
At step 8, 1 is subtracted from N and the process returns to step s2. At step s2, the next part to be measured is selected.
The processing from is continued. On the other hand, when it is selected to contain a bent portion stbm in step s3 (in the example shown in FIG. 4, when the total length L ₁ and length L ₃ is selected as the measurement target region), In step s9, various conditions for setting the bending allowance α are input, and in step s10, the bending allowance α is set based on the input conditions.

The conditions input in step s9 are, for example, the thickness of the sheet metal product, the type of material, the angle of the bent portion, the bending radius, the bending means, and the like. The bending margin α empirically obtained from the thickness, material, and bending angle is stored in the memory of the central control device 20 as a table, and the bending margin α is automatically determined based on the conditions input in step s9. For example, when the bending allowance is calculated by a calculation formula such as a round bending, a means for setting the bending allowance α based on the calculation formula, and further, a unique bending allowance α in consideration of the above-described conditions.
Is input.

When the bending margin α is set in step s10, the correction values of the dimensions A to D on the design drawing of the measurement target part are calculated in step s11 based on the bending margin α. Correction performed here, for example, when the measurement target region of the full length L _1, in front of the bending of the blank,
Since it is cut short in consideration of elongation due to bending, a value obtained by subtracting the bending allowance α from the dimension A + B (A +
B-α) is the correction value.

In the case where the portion to be measured has a length L ₃ , the correction value is C-α because this is shown as an outer dimension in FIG. When the dimension C is shown as an inner dimension on the design drawing, the correction value is C + α2. When a correction value considering the bending margin α of the bending process is obtained in step s11, it is selected in step s12 whether or not the reference of the measurement target portion appears on the measurement target.

In the calculation of the correction value executed in step s11, for example, a plurality of, for example, 2
If the part includes a 90-degree bent part,
The bending margin α is calculated as 2α. The determination as to whether or not a reference has appeared in the measurement object in step s12 includes:
For example, when the measurement target region of the full length L ₁ becomes the edge of both ends of the reference, in this case, the monitor device 14
Since this appears on the object to be measured, the step s1
In step 2, “Y” is selected, and when the measurement target portion is the length L ₃ , the reference folding line does not appear on the measurement target, and thus, in step s12, “N” is selected. You.

When "Y" is selected in step s12, the measurement of the measurement target part is performed in step s13 by the same method as in step s4, and in subsequent step s14, the measured value and the corresponding design drawing are displayed. Steps from the dimensions of
The correction values obtained in step 11 are compared with each other, and the quality of the machining state is determined based on whether or not these differences are within a predetermined range. The value and the determination result are displayed on the monitor device 14 and printed on the printer 18, and the process proceeds to step s7.

On the other hand, when "N" is selected in step s12, the reference virtual line P is displayed on the measurement target displayed on the monitor device 14 in step s15 based on the correction value obtained in step s11. Is displayed. Then, the length L ₃ from the displayed reference virtual line P in step s16 is measured. When the measured value is obtained in this manner, the measured value is compared with the correction value obtained in step s11 in the following step s17, and the machining state is determined based on whether or not the difference falls within a predetermined range. Pass / Fail is determined,
Thereafter, in step s7, the measured values and the dimensions, correction values, and judgment results on the design drawing are displayed on the monitor device 14, and printed on the printer 18, and the process proceeds to step s7.
If N is determined to be 0 at 7, the control procedure ends.

In the two-dimensional coordinate measuring machine configured as described above, when the object to be measured has a bent portion and the dimensions of the bent portion are specified in the bent state, The designated size, for example, A + B is corrected based on the bending margin α of the bent portion, and the pass / fail is determined by the centralized control device 20 based on the corrected value and the measured value, so that troublesome manual calculation processing is not required. .

Further, in this embodiment, when the object to be measured has a bent portion and the dimensions including the bent portion are specified based on a reference that does not appear on the object to be measured, the bent portion is The reference is corrected based on the bending allowance α, and the corrected reference is virtually displayed by the centralized control device 20 on the measurement object displayed on the monitor device 14. It becomes possible to determine the quality by measuring the dimensions, and the measurement efficiency and measurement accuracy are improved.

In the above embodiment, the control procedure when the reference is present on the object to be measured and the case where the reference is not present coexist has been exemplified. The present invention is not limited to the object, but can be applied to any one of the cases. Further, in the above embodiment, in the control procedure shown in FIG. 2, the number N of the measurement target parts is inputted in step s1, and N is inputted in step s7.
Is determined to be 0 or not, and in step s8, 1 is subtracted from N and the flow returns to step s2. However, each of these steps is necessary in the case of automatic measurement. In the case of manual measurement, these steps may be deleted.

[0031]

As described above in detail in the embodiments,
ADVANTAGE OF THE INVENTION According to the two-dimensional coordinate measuring machine concerning this invention, when the to-be-measured object has a bending part and the dimension of the said bending part is designated in the state where it was bent, the bending allowance of the bending part is given. The centralized controller determines the quality based on the corrected value and the measured value, so that troublesome manual calculation processing is not required and the dimension is calculated based on a standard that does not appear on the measurement object. When is specified, the reference corrected by the bending allowance is virtually displayed on the monitor device, so the dimensions from the reference can be measured directly on the monitor device, and this can be displayed on a printer, etc. It becomes possible to improve measurement accuracy and efficiency.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the overall configuration of a two-dimensional coordinate measuring machine according to the present invention.

FIG. 2 is a flowchart illustrating an example of a control procedure of the two-dimensional coordinate measuring machine of the present invention.

FIG. 3 is an explanatory view of a design drawing after bending a measurement object to be measured by the two-dimensional coordinate measuring machine of the present invention.

FIG. 4 is a plan view showing an example of a measuring object of the two-dimensional coordinate measuring machine of the present invention.

[Description of Signs] 10 CCD camera 12 Image memory 14 Monitor device 16 Mouse 18 Printer 20 Central control device 23 Keyboard switch P Virtual line

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroyuki Fujisawa 260-63, Yanagimachi, Hase, Atsugi-shi, Kanagawa Inside Sokia Atsugi Plant Co., Ltd. (56) References JP-A-62-263834 (JP, A) 1-1134509 (JP, A) JP-A-62-135705 (JP, A) JP-A-2-226371 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01B 11/00 -11/30 102 B05D 5/00-9/18 G06T 7/00

Claims (1)

(57) [Claims] 1. A CCD camera which is supported so as to be relatively movable in a two-dimensional direction parallel to a two-dimensional measurement object, and which images a measurement object having an edge defined by a light-dark difference and outputs the image as an electric image signal. An image memory for storing an image signal of the CCD camera, a monitor device for reproducing and displaying the object to be measured on two-dimensional coordinates, a coordinate indicating device for specifying and specifying an arbitrary point on the monitor device, and the image The image signal stored in the memory is subjected to predetermined image processing and output to the monitor device, and based on a point specified and specified by the coordinate pointing device, an edge of the measurement target is detected and the monitor is monitored. A two-dimensional coordinate measuring machine comprising: a central control device that calculates an edge coordinate value on the device and calculates a measurement value such as the shape and size of the measurement target based on the edge coordinate value; The centralized control device has a bending portion to be post-processed on the measurement object, and when the dimension of the bending portion is specified in a bent state, the bending margin of the bending portion is used. Correct the specified dimensions based on this
The corrected reference is displayed on the monitor device.
A two-dimensional coordinate measuring machine , which is virtually displayed on a measurement target and judges pass / fail based on the correction value and the measurement value.