KR0126093B1 - Measurement method of gap and difference in level - Google Patents

Abstract

The present invention provides a method for measuring the gap and step of two members to be closely coupled to each other, wherein the two members to be measured are recognized as a continuous line by the optical cutting method, and the second and the second longest lines The method of measuring gaps and steps is characterized in that the centers of the straight portions and the curved portions at the ends of the two members to be measured are long, and the center distances are defined as gaps, and the distance between the straight lines is determined as steps. As a result, the gap and the step measurement can be simplified and the measurement reliability can be improved.

Description

Clearance and Step Measurement Method

1 is a schematic configuration diagram of a measuring device used in the gap measuring method of the present invention.

FIG. 2 is an explanatory diagram of the measurement unit shown in FIG.

3 is an explanatory diagram of the measurement unit shown in FIG.

4 is a flowchart of the measuring method of the present invention.

5 is a flowchart of the measuring method of the present invention following FIG.

6 is a view showing a measurement state according to the measuring method of the present invention.

7 is a view showing a measurement state according to the measuring method of the present invention.

8 is a view showing a measurement state according to the measuring method of the present invention.

9 is a view showing a measurement state according to the measuring method of the present invention.

10 is a view showing a measurement state according to the measuring method of the present invention.

11 is a flowchart of a measurement operation showing the gap measuring method of the present invention according to the measuring apparatus shown in FIG.

12 is a schematic configuration diagram of a measuring device used in a conventional gap measuring method.

* Description of the symbols for the main parts of the drawings *

3: image processing apparatus, 5: camera unit (recognition means),

6: CCD camera (recognition means), 20: measuring unit,

21: Slit light source (irradiation means).

The present invention relates to a gap and step measuring method for measuring, for example, an opening, a gap, and a step of a coupling part to which a door formed when the door is closed and a vehicle body opposite thereto.

Various panels constituting the vehicle body are press-molded in various shapes according to the structure and rigidity of the vehicle body, and most of them are welded and assembled to the vehicle body frame. In addition, a door, hood or trunk lid formed by such a panel is coupled to the vehicle body so as to be openable and open, and a sealing member that is in close contact with the vehicle body in the closed state is coupled to an end of the opening / closing member.

These panels have a bad influence on the structure and rigidity of the vehicle body, for example, when distortion or deformation due to poor press working or poor welding occurs. Therefore, the shape of the processed panel after press working or after welding is appropriate. Of course, the surface shape of the panel processed in the inspection process is determined to determine whether it is in the design process, and it is checked whether it is formed as designed. It should be checked if it is coupled to this proper position (design position).

For example, if the gap between the door and the body is not in the proper position, it is impossible to reliably prevent the intrusion of water or dust, or if the gap between the door and the body is too wide or the step is too wide, the sound of wind blowing while driving Problems such as increase also occur, and when the door is coupled to the vehicle body, the gap and the step formed between the door and the vehicle body are measured to check whether the gap or the step is within the allowable range.

Until recently, the measurement of the gap and step of each panel (for example, the door and the vehicle body) was performed by using a step gauge or a vernier caliper. In recent years, due to such quality problems, it has become mainstream to use a measuring device that performs measurement by a so-called optical cutting method.

Conventionally, for example, as shown in FIG. 12, a measuring device by the optical cutting method is used. The measuring device shown here includes the slits-like slitting light irradiated by the slit light source 4, the panel 2a and the panel ( The reflected light formed by reflecting on the surface of 2b) is input by the CCD camera 6 of the camera unit 5, and the image processing apparatus 3 performs image processing on the image data corresponding to the reflected light which is output by the panel 2a. ) And the gap and step of the panel 2b are measured.

By the way, the conventional optical cutting method measures the shape by detecting the reflected light from the panel 2a and the panel 2b by the slit light, but the ends of the panel 2a and the panel 2b form a curved surface. Therefore, there is a problem that the measuring device cannot detect the reflected light and cannot measure the gap between the correct ends.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem. For example, a gap and step measuring method capable of measuring a gap and a step between a door of an automobile and an opening of a vehicle body opposite thereto is good in workability and accurate. It aims to provide.

According to the present invention for achieving the above object, a measuring unit integrating irradiation means for irradiating slit light on a surface of a member under test and recognition means for recognizing a shape of reflected light on the surface of the member under measurement formed by the slit light. And a predetermined measuring apparatus for approaching one of the first to-be-measured members by using a measuring device for measuring the shape of the surface of the member to be measured by optical cutting according to the shape of the reflected light recognized by the recognition means. A measuring method for measuring the gap and the step of a member under measurement coupled to the first member under measurement so that the second member under measurement is formed so as to form a gap at intervals of the first member. A first step of measuring, by the measuring device, shapes of both the second measuring member approaching side of the measuring member and the first measuring member approaching side of the second measuring member; The second step of recognizing the shape measured by one step as the continuous line, and the longest continuous line among the continuous lines is used as the first continuous line, and the second continuous line is selected as the second continuous line. And a fourth step of recognizing the end point P01 of the approaching side of the second continuous line of the first continuous line, and a predetermined distance A1 from the end point P01 recognized by the fourth step. A fifth step of calculating the point P1 on the first continuous line; a sixth step of obtaining a first approximation straight line C1 in which the first continuous line is straightened with the point P1 as an end point; A seventh step of calculating the point Q1 on the first continuous line separated from the first approximation straight line C1 in the depth direction of the gap of the measuring member by the predetermined distance B1; and the point P1 and the point ( In the eighth step of comparing the positions of Q1), and in the eighth step, the point P1 is the second station than the point Q1. The point P1 is changed to a value obtained by doubling the predetermined distance A1 by the fifth step in the direction away from the end point P01 of the second continuous line approaching side when the line P1 is located on the line approaching side ( P1 '), and the point Q1 approaches the second continuous line from the point P1 with the point P1 of each step from the sixth step to the eighth step as the point P1'. The ninth process is repeated until it is located on the side, and the equal point obtained by dividing a plurality of points between the point Q1 from the point P1 is obtained, and is perpendicular to the straight line passing through two adjacent points of the equal point. A tenth step of obtaining a plurality of points separated by a predetermined distance R1 on a straight line, and a position obtained by averaging the plurality of points as the center O1 of the curved surface at the end of the second continuous line approaching side of the first continuous line; A twelfth step of recognizing and a twelfth point of recognizing the end point P02 of the first continuous line approaching side of the second continuous line And a thirteenth step of calculating the second continuous point P2 at a predetermined distance A2 from the end point P02 recognized by the twelfth step; and the second continuous line as the point P2. A fourteenth step of obtaining a straightened second approximation straight line C2 as an end point; and a point separated from the second approximation straight line C2 by a predetermined distance B2 in a depth direction of a gap of the measuring member on the second continuous line A fifteenth step of obtaining (Q2); a sixteenth step of comparing positions of the point (P2) and the point (Q2); and in the sixteenth step, the point (P2) is larger than the point (Q2). When located at the second continuous line approaching side, the point P2 is a value obtained by doubling the predetermined distance A2 according to the thirteenth step in the direction away from the end point P02 of the first continuous line approaching side. The changed point P2 'is calculated, and the point P2 of each step from the fourteenth step to the sixteenth step is defined as the point P2'. The seventeenth step of repeating until the point Q2 is located closer to the second continuous line than the point P2, and the equal points obtained by dividing a plurality of points between the point Q2 and the point Q2 To obtain a plurality of points separated by a predetermined distance (R2) on a straight line perpendicular to a straight line passing through two adjacent points of the equal point; and a position obtained by averaging the plurality of points to the second line of the second continuous line. 19th process recognized as center O2 of the curved surface in the edge part on a continuous line approach side, the line passing through the said center O1 orthogonal to the said 1st approximation straight line, or the 2nd approximation straight line, and the said center O2 The distance L in parallel with the first approximation straight line or the second approximation straight line between the lines passing through) is obtained, and the distance obtained by subtracting the predetermined distances R1 and R2 from the distance L is obtained by the first approximation straight line. A twentieth step, which is obtained as a gap between the member under measurement and the second member under measurement, and divided into two equal parts of the distance L; And a twenty-first step of obtaining the difference between the line extending the first approximation straight line and the line extending the second approximation straight line as a step between the first measurement member and the second measurement member. This is a gap and step measurement method.

The operation of the gap and step measurement method of the present invention will be described below.

First, the first step of measuring the shape of both the approaching side of the second measurement member of the first measurement member and the approaching side of the first measurement member of the second measurement member with the measurement device set at an arbitrary position; And a second step of recognizing the measured shape as a continuous line, and a third selecting the second long continuous line as the first continuous line and the second long continuous line as the second continuous line. By the process, either the longest first continuous line or the second longest second continuous line is recognized as a shape corresponding to each of the first to-be-measured member or the second to-be-measured member.

First, a fourth step of recognizing the end point P01 of the first continuous line approaching side of the second continuous line with respect to the first continuous line, and a predetermined distance from the end point P01 recognized by the fourth step. A1) A fifth process of calculating the point P1 on the said 1st continuous line which fell, and the 6th process of obtaining the 1st approximation straight line C1 which linearized the said 1st continuous line as said end point P1. And an end position of the member under measurement by the seventh step of calculating the point Q1 on the first continuous line separated from the first approximation straight line C1 in the depth direction of the gap of the measurement member by a predetermined distance B1. Determine. At this time, the point P1 is compared with the point Q1 by the eighth step, and when the point P1 is located closer to the second continuous line than the point Q1, it is deeper than the straightened portion. Since the point Q1 exists in the portion, it is determined that the straight line approximation is not performed correctly, and the point P1 is set to 2 in the direction away from the second continuous line approach side by the predetermined distance A1 by the fifth step. The point P1 in the eighth step is calculated as the point P1 'changed to the doubled value and the point P1 of each step from the sixth step to the eighth step is the point P'. And end point Q1 are compared and the end of the correct curved portion is started by the ninth process, which is repeated until point Q1 is located closer to the second continuous line approach side than point P1.

Then, a plurality of points are obtained by dividing a plurality of points between points Q1 from points P1, and a plurality of points away from a predetermined distance R1 on a straight line perpendicular to a straight line passing through two adjacent points of the equal points. At the end of the second continuous line approaching side of the first continuous line by the eleventh step of recognizing, as a center O1 of the curved surface at the end of the first continuous line, the tenth step and the position obtained by averaging the plurality of points. Determine the center of the curved surface.

Each step so far is performed in the same way with respect to the second continuous line to determine the center of the curved portion at the end portion on the first continuous line approaching side of the straightening of the straight line portion in the second continuous line (steps 12-19).

As described above, since the exact positions of the ends of the first measurement member and the second measurement member are determined as the first continuous line and the second continuous line, the center O1 and the center O2 of each curved portion by the 20th step. A gap is obtained by subtracting the predetermined distances R1 and R2 from the distance L parallel to the first approximation straight line. The difference between the first approximation straight line and the second approximation straight line is determined by the 21st step. The value taken at the middle of the distance L is obtained as a step.

Therefore, the gap and step measurement method of the present invention selects the longest continuous line and the second longest continuous line from the cross-sectional shape obtained by the optical cutting method, and straightens the straight portions in the two continuous lines to form curved portions at adjacent ends. Since the center position was calculated and the value obtained by subtracting the radius of the curved portion from the distance from the center position was obtained as the gap, the difference between the straightened portions was obtained as the step difference, so there was no deviation or error by the measurer when measuring by a conventional human hand. The gap and step formed by the first and second measurement members can be accurately measured. In addition, the time taken for the inspection process can be shortened, and the productivity can be improved.

Hereinafter, an embodiment of the gap and step measuring method of the present invention will be described in detail with reference to the drawings.

1 is a schematic configuration diagram of a measuring apparatus used in the gap measuring method of the present invention, and FIGS. 2 and 3 are explanatory diagrams of the measurement unit shown in FIG. In addition, in each figure, the same code | symbol is attached | subjected to the member same as the member demonstrated by the prior art.

As shown in FIG. 1, the measuring method used in the gap measuring method of the present embodiment is a computer 8 which performs the measurement unit 20, the image processing apparatus 3, the indication of the measurement site, the aggregate evaluation of the measurement result, and the like. And a monitor 7 displaying measurement results and the like, and the measurement unit 20 converts the reflected light formed on the surface of the member under measurement into a video signal and outputs it to the image processing apparatus 3 as in the related art. It is supposed to be. In addition, the monitor 7 may be configured to output a record by a printer (not shown).

The measuring unit 20 is configured as shown in FIGS. 2 and 3. As shown in FIG. 2, the measuring unit 20 is provided with two slit light sources 21 as irradiation means. These slit light sources 21 are formed of a semiconductor laser element, a collimated lens (not shown), and a cylindrical lens (not shown), which are not shown in the same manner as the slit light source 4 of the conventional measurement unit 1. It is built in the outer periphery case 22 of the columnar shape, and the slit light formed by these is irradiated to the exterior from the light irradiation port 23 formed in the outer periphery case 22. Each slit light source 21 is supported by a holder 25 fixed to a base 24, and the base 24 is optically cut with respect to the slit light source 21 supported by the holder 25. The camera unit 5 is fixed so as to be in a positional relationship in which the shape can be measured.

The holder 25 is as shown in FIG. The holder 25 is formed with a support hole 30 for supporting the outer circumferential case 22 of the slit light source 21. As shown in the partial sectional view of FIG. 3, the support hole 30 has a fitting tolerance of about H7 with respect to the adjusting part 31 having a diameter of several mm larger than the outer diameter of the outer case 22 and the outer case 22. The light irradiating port 33 having a diameter through which the slit light can pass is formed in accordance with the coupling portion 32 and the optical scanning port 23 having a diameter. In addition, each of the supporting holes 30 is formed in the holder 25 so as to be inclined by contrast so that the respective slit lights irradiated from the respective slit light sources 21 overlap each other in the longitudinal direction. That is, when the slit light source 21 is mounted in the support hole 30, each slit light output from each slit light source 21 can recognize the CCD camera 6 of the camera unit 5; They overlap within the recognition range.

The slit light source 21 is attached to the support hole 30 so that the light irradiating port 23 faces the light irradiating port part 33, and the end of the outer circumferential case 22 on the light irradiating port 23 side is coupled. Coupled to the part 32, the end part is fixed to the holder 25 by the fixing screw 34, and the other end is fixed by fixing screws 35-38 from all directions. When these slit light sources 21 are operated, as shown in the drawing, the surface of the panel 2 is set so that the slit light is irradiated from different directions, and the respective slit light is set to be in an overlapped state. Even if the concave portion as shown in Fig. 2 is formed, the shape of the concave portion can be reliably measured.

In addition, each of the slit light sources 21 is adapted to adjust the irradiation direction of the slit light to be irradiated by adjusting the fastening amount of the fixing screw (35-38). By adjusting the clamping amounts of the fixing screws 37 and 38, the slitting light in the direction perpendicular to the longitudinal direction of the slitting light can be adjusted. The slitting light source is relaxed while the fixing screws 34-38 are relaxed. (21) By rotating itself, the direction of the longitudinal direction of the slit light can be adjusted. And each of the slit light sources 21 is adjusted so that the optical axis of each output slit light may be matched with the reference optical axis by the fixing screws 34-38. In addition, these fixing screws 34-38 are prevented from loosening by the screw lock material after completion of adjustment.

The video signal from the CCD camera 6 of this measuring unit 20 is processed by the image processing apparatus 3, and the image processing apparatus 3 is moved from the CCD camera 6 as shown in FIG. A video signal is subjected to A / D conversion (analog / digital conversion), inputted to the image memory 301, and image-processed by the image processing operation unit 302 to form the surface shape of the member under measurement represented by the reflected light as an image. At the same time, data is sent to the computer 8 via the communication unit 303 connected by a data bus by calculating the gap and the step. Further, the image data input to the image memory 301 is D / A converted and displayed on the monitor 7.

In addition, the measuring device having the measuring unit 20 configured as described above is configured to operate in accordance with the flows shown in FIGS. 4 and 5, and thus, for example, in a coupling part of a door and a vehicle of a conventional vehicle. It is possible to measure the gap and the step in the case.

Hereinafter, the gap and step measuring method according to the present invention using this measuring device will be described with reference to FIGS. 4 and 5 are measurement flow charts, and FIGS. 6 to 10 are diagrams for explaining measurement areas.

First, as the first step S1, the engaging portion of the door panel (first member under measurement 2a) and the vehicle body (second member under measurement 2b) is measured as the measurement site and measured by the measurement unit 20. As shown in FIG. 6A, as the second step S2, the image processing apparatus 3 is recognized as a spacing continuous line. The perceived image is conspicuous because the slits for measurement do not enter the interior, or the reflection of the laser beam that has entered the interior does not reach the CCD camera 6 in the deep gap of the coupling portion. In the case shown, the recognized continuous line is four by the line a-d. Incidentally, the data in the image processing apparatus 3 is recognized as a set of points on the XY coordinates. In the following processing, all of the points or a set of points on the XY coordinates are processed as lines.

Next, as shown in FIG. 6B, as the third step S3, the longest continuous line among these sparse continuous lines is selected as the first continuous line, and the second long continuous line is selected as the second continuous line. Select as line. Anything shorter than the second continuous line is deleted from the object to be processed. Here, the line b becomes the first continuous line, the line d becomes the second continuous line, and the lines a and c are deleted from the object to be processed. Here, the measurement part of two panels (door panel and a vehicle body) in a measurement site is recognized as two continuous lines here.

Next, as shown in FIG. 6C, as 4th process S4, the endpoint P01 of the approach side of the 2nd continuous line of 1st continuous line b is calculated | required, and it is a point as 5th process S5. The point P1 on the first continuous line separated from the predetermined distance A1 from P01 is obtained. Although this predetermined distance A1 is arbitrarily defined, what is necessary is just to set it as the design value corresponding to the radius of the curved part in the edge part of the door panel 2a or the vehicle body 2b which is a member to be measured, for example.

As shown in FIG. 6D, as the sixth step S6, the first continuous line b having the point P1 as the end point is straightened to obtain a first approximation straight line C1. The first approximation straight line C1 may be obtained by approximating the coordinate value of each point from (P1) on the first continuous line b on the XY coordinates to the other end point by the least-squares method.

Next, as shown in FIG. 6E, as the seventh step S7, the first continuous line b of a distance separated from the first approximation straight line C1 by a predetermined distance B1 in the depth direction of the gap between the measurement sites. Find the point (Q1) on). This predetermined distance B1 is changed depending on how far the gap is measured, and is defined as a predetermined standard at the time of measurement. This is set as a standard at the time of measurement because the measured value of the gap changes as the depth of the measurement portion of the gap changes.

Next, as the eighth step S8, the point P1 on the first continuous line b is compared with the point Q1, and the point P1 approaches the second continuous line d rather than the point Q1. Is located at P9 ', the point P1 is changed to a value obtained by doubling the predetermined distance A1 of the fifth step in a direction away from the approaching side of the second continuous line as the ninth step S9. ), And repeating step (S91) with the point P1 of each step from the sixth step (S6) to the eighth step (S8) as the point (P1 '), and the point (P1) and the point. The first approximation straight line C1 and the point Q1 are newly obtained by comparing (Q1) until the point Q1 is located closer to the second continuous line approach side than the point P1.

The comparison between the points P1 and P2 in the eighth step confirms whether or not the straight portion of the second continuous line b is accurately approximated, that is, as shown in FIG. ) Is on the left side of the point P1, the first approximation straight line is obtained by using the point P1 as the end point of the straight line (sixth step S6). The straight part of the continuous line is not approximated correctly so that the point Q2 of the part away from one straight line is included. Therefore, when showing the position of the point P1 which is the end point of the linearized approximation part, the point P1 'is obtained by deviating twice the predetermined distance A (2xA) to the sin side and obtaining the approximate straight line again. Accurate straightening of the straight portion is performed, and at the same time, the point Q1 at the end necessary for the measurement is obtained.

Next, as shown in FIG. 8, as a tenth step S10, a plurality of equal points are obtained by dividing a plurality of points from the point P1 to the point Q1, and passing two adjacent points of the equal point. A plurality of points separated by a predetermined distance (R1) on a straight line perpendicular to a straight line are obtained for each of the two points of the plurality of equal points, and as the eleventh step (S11), the first average line is a position obtained by averaging a plurality of points. It recognizes as center O1 of the curved surface in an edge part. At this time, only the point where the distance R1 is separated is obtained only when the intersection angle between the straight line passing through two adjacent points and the first approximation straight line C1 is in the range of 20 to 80 degrees. When the crossing angle is not in the range of 20 to 80 degrees, it determines that there is no curved portion at the end of the first continuous line and stops obtaining the center O1, and the point Q1 is measured by the first continuous line b. This is to be regarded as the end point of the side.

From the above-described fourth step S4, the first continuous line b, i.e., in the case shown in the drawing, the panel shape on the left side is recognized by the eleventh fixing S11.

Next, the shape recognition of the 2nd continuous line b is performed similarly to the panel shape recognition of the 1st continuous line b from 4th process S4 to 11th process S11 mentioned above. That is, as shown in FIG. 9, first, as the twelfth step S12, the end point P02 of the approach side of the first continuation line of the second continuation line b is obtained, and the point as the thirteenth step S13 is obtained. The point P2 on the second continuous line separated from the predetermined distance A2 by P02 is obtained. This predetermined distance A2 may be the same as the predetermined distance A2 in the first continuous line described above, and may be different when the panel shape is different in design. And as 14th process S14, the 2nd approximation straight line C2 of the 2nd continuous line d which made point P2 the end point is calculated | required by the method similar to the 1st approximation straight line mentioned above.

Next, as a fifteenth step S15, the point Q2 on the second continuous line d at a distance separated by the predetermined distance B2 in the depth direction of the gap between the measurement sites from the second approximation straight line C2 is obtained. . This predetermined distance B2 is the depth of the measurement position in the case where this panel surface is used as the measurement reference.

Next, as the sixteenth step S16, the point P2 on the second continuous line d is compared with the point Q2, and the point P2 is closer to the first continuous line b than the point Q2. In the case where is located at, the point P2 'obtained by changing the predetermined distance A2 to the value doubled in the direction away from the first continuous line approaching side as the seventeenth step S17 is calculated and the fourteenth step S14. ) And the point P1 of each step from step (S16) to the point (P1 ') (S171) is repeatedly performed to compare the point (P2) and the point (Q2) to the point (Q2). The second approximation straight line C2 and the point Q2 are newly obtained until it is located closer to the first continuous line b than the point P2.

Next, as an eighteenth step (S18), a plurality of equal points are obtained by dividing a plurality of points Q2 from the points P2, and the predetermined distance of the straight line perpendicular to the straight line passing through two adjacent points of the equalized points ( R2) The separated points are obtained for each two points of the plurality of equal points, and as the nineteenth step (S19), the position where the plurality of points are averaged is used as the center of the curved surface O2 at the end of the second continuous line. Recognize. At this time, as in the eleventh step (S11), the angle of crossing the distance (R2) to obtain only the intersection of the straight line passing through two adjacent points and the second approximation straight line (C2) is in the range of 20 to 80 degrees Is not in the range of 20 to 80 degrees, it is determined that there is no curved portion at the end of the second continuous line and stops to obtain the center O2 and considers the point Q2 as the end point of the side of the second continuous line d measured. do.

Thereby, the second continuous line d, i.e., the panel shape on the right side in the measurement portion, when shown, is recognized.

As described above, since the straight portions of the first continuous line b and the second continuous line d and the curved portions of the end portions of the portions approaching each other are recognized, the gap and the step of the measurement portion are obtained from these.

First, as shown in FIG. 10, the gap is the twentieth step (S20), where the first approximation straight line C1 is made parallel to the X axis of the XY coordinate, and the center O1 of the first continuous line b is shown. The distance L at the X coordinate with the center O2 of the second continuous line d is obtained, and the distance L obtained by subtracting the R1 and R2 is obtained as a gap. Expressed in the equation, the gap = L- (R1 + R2). In this embodiment, the first approximation straight line is used as a reference, but the second approximation straight line may be used as a reference. In that case, the second approximation straight line is made parallel to the X axis.

Next, the step is a twenty-first step (S21), in which the first approximation straight line C1 and the second approximation straight line C2 are extended so that the center O1 of the end of the first continuous line and the center of the second continuous line end ( It is calculated | required as the space | interval of 1st approximation straight line C1 and 2nd approximation straight line C2 extended in the intermediate | middle point of frost L in X coordinate with O2), respectively.

The following describes the flow of the entire measurement with reference to the flowchart shown in FIG.

First, the measurement site is instructed by the computer 8 (S100), and the measurement unit 20 is set to the measurement site (S101).

Subsequently, the measurement switch is turned ON to input the shape of the measurement portion into the image memory 301 of the image processing unit 3 (S102), and the gap and the step are obtained by the measuring method according to the present invention described above (S103). Then, the measurement result (measured value of the step and the gap) and whether it is measured normally (OK or NG or the like) are transmitted to the computer 8 (S104).

Subsequently, it is judged whether or not all the measurement sites have been measured (S105). If all are not completed, the process returns to step 100 (S100), the instruction of the next measurement site is made, the measurement is performed, and the measurement of all the measurement sites is completed. If so, the measurement data is recorded, printed out and finished (S106).

Table 1 shows the results measured as described above. This measurement is a measurement result of the gap and step of two measurement sites (point 1 and point 2) on the surface of the door panel and the fender panel of the vehicle body, and the measurement unit 20 is supported on the measurement site by the robot. This is the result of repeating the measurement 32 times for the measurement site.

TABLE 1

As can be seen from Table 1, the deviation according to the number of times of measurement only appears slightly in the gap measurement, and the value is also low as 0.2 mm. And the average of 32 times is substantially identical with the measurement result by a vernier caliper.

In addition, the supporting method of the measuring unit 20 to the measuring part may be arbitrarily used, and it can be fixed by a human hand, using a fixing member, or fixed to a robot hand as in the prior art so that measurement can be performed automatically. Of course it is good.

Claims (1)

And a measuring unit incorporating the irradiating means for irradiating the surface of the member under measurement with the slit light and the recognizing means for recognizing the shape of the reflected light on the surface of the member under measurement formed by the slit light. By using a measuring device for measuring the surface shape of the member under measurement by the optical cutting method according to the shape of the reflected light, the other side is formed so as to form a gap at a predetermined interval when approaching the first member under measurement. (2) A measuring method for measuring the gap and the step of the member under measurement coupled to the first member under measurement so as to be spaced apart and accessible to the first member, the approaching side of the first member under measurement and The first process of measuring the shape of both the said 1st measurement member approaching side of the said 2nd measurement member by the said measuring apparatus, and the shape measured by the said 1st process as a continuous line. The second step of calculating, the third step of selecting the continuous line that is the longest of the continuous lines as the first continuous line, the third step of selecting the second continuous line as the second continuous line, and the first continuous line A fourth step of recognizing the end point P01 of the second continuous line approaching side; and a point P1 on the first continuous line away from the end point P01 recognized by the fourth step by a predetermined distance A1. A fifth step of calculating, a sixth step of obtaining a first approximation straight line C1 obtained by straightening the first continuous line as the end point P1, and the measuring member from the first approximation straight line C1. A seventh step of calculating a point Q1 on the first continuous line separated by a predetermined distance B1 in the depth direction of the gap of the second step; and an eighth step of comparing the positions of the point P1 and the point Q1; In the eighth step, the point P1 is located closer to the second continuous line than the point Q1. A point P1 'obtained by changing (P1) to a value obtained by doubling the predetermined distance A1 according to the fifth step in the direction away from the end point P01 on the second continuous line contact side is calculated; A ninth step is repeated until the point Q1 is located closer to the second continuous line approach side than the point P1, with the point P1 of each step from the step to the eighth step as the point P1 '. Steps are obtained by dividing a plurality of equal points between the points Q1 and the points Q1, and a plurality of points apart from a predetermined distance R1 on a straight line perpendicular to a straight line passing through two adjacent points of the equal points. A tenth step of obtaining; an eleventh step of recognizing a position obtained by averaging the plurality of points as a center O1 of a curved surface at an end of the first continuous line approaching side of the second continuous line; and the second continuous A twelfth step of recognizing the end point P02 of the first continuous line approaching side of the line; and an end point P02 recognized by the twelfth step. A thirteenth step of calculating the point P2 on the second continuous line separated from the predetermined distance A2 by a second approximation straight line C2 in which the second continuous line is straightened with the point P2 as an end point; A fourteenth step of obtaining; a fifteenth step of obtaining a point Q2 spaced apart from the second approximation straight line C2 by a predetermined distance B2 in a depth direction of a gap of the measuring member on the second continuous line; In a sixteenth step of comparing the position of P2) with the point Q2; and in the sixteenth step, when the point P2 is located closer to the second continuous line than the point Q2, A point P2 'is obtained by changing the point P2 to a value obtained by doubling the predetermined distance A2 according to the thirteenth step in a direction away from the end point P02 on the approach side of the first continuous line, and calculating the point P2'. From the 14th process to the 16th process, the said point P2 of each process is made into the said point P2 ', and point Q2 is closer to the 2nd continuous line approaching side than point P2. 17th step which repeats until it reaches a value, and the equal point which divided | segmented into two or more between said point Q2 from the said point P2 is calculated | required, and is a straight line perpendicular | vertical to the straight line which passes two adjacent points of said equal point An eighteenth step of obtaining a plurality of points separated by a predetermined distance R2, and a position obtained by averaging the plurality of points is recognized as the center O2 of the curved surface at the end of the first continuous line approaching side of the second continuous line. The 19th step; and the first approximation straight line or the second approximation straight line between the line passing through the center O1 orthogonal to the first approximation straight line or the second approximation straight line and the line passing through the center O2. A twentieth step of obtaining a parallel distance L and subtracting the predetermined distances R1 and R2 from the distance L as a gap between the first measurement member and the second measurement member; And a line extending the first approximation straight line on a bipartite point of the distance L; And a twenty-first step of obtaining a difference between the line extending the second approximation straight line as a step between the first member and the second member to be measured.