JPH06161533A - Control system for three-dimensional measuring device - Google Patents

Abstract

PURPOSE:To provide the control system of a three-dimensional measuring device which enables the complete automation of a measuring work also for a measured object having no CAD data. CONSTITUTION:This system is the control system of a three-dimensional measuring device which is provided with a three-dimensional measuring device 1 provided with a gauge head 2 to move after the surface of a measured object 3 and a computer for control 6 to perform the numerical control of the measuring route of the gauge head 2. A CCD camera 9 to photograph the measured object 3 is arranged on the three-dimensional measuring device 1, the contour shape of the measured object 3 is recognized by performing the image processing for the output signal of the CCD camera 9, the measuring route of the gauge head 2 is generated based on the recognition result and a teaching is performed for the computer for control 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control system for a contact type three-dimensional measuring device.

[0002]

2. Description of the Related Art Conventionally, a contact-type three-dimensional measuring device for measuring (digitizing) a free-form surface shape of a three-dimensional object has been known. For example, a curved surface shape of a three-dimensional object produced based on three-dimensional CAD data. Is actually measured and the CAD data and the measured data are compared (Magazine "Nikkei Mechanical" December 23, 1991, 28-38).
page).

FIG. 4 shows a conventional three-dimensional measuring device. The three-dimensional measuring machine (1) comprises a measuring element (2) to be moved along the surface of the measuring object (3), and the measuring path of the measuring element (2) is controlled by the control device (5), The measurement data associated with the tracing movement of the tracing stylus (2) is taken in by the control device (5).

The control device (5) has a control computer (6)
Is connected, and the measurement path data created by the control computer (6) is supplied to the control device (5).

Further, the control computer (6) has a group of instructions, that is, a part program, for instructing the measurement path and the measurement procedure of the probe (2) based on the three-dimensional CAD data (8).
A part program creating device (14) for creating (7) and teaching to the control computer (6) is connected.

According to the three-dimensional measuring device, the three-dimensional CA
Of the D data (8), the movement path of the two-dimensional measuring element (2) is determined based on the two-dimensional data X and Y, and
Based on the remaining one-dimensional data Z, the interference of the probe (2) with the measurement object is checked, and a measurement path for obtaining the actual measurement data Z ′ in the one-dimensional direction is generated.

[0007]

[Problems to be Solved by the Invention] However, the above 3
The dimension measuring device uses C for automatic generation of the measurement path.
AD data is indispensable, and there is a problem that a measurement operator has to manually determine a measurement route for a measurement object without CAD data. Further, even for a measurement object having CAD data, it is necessary to manually input the position of the measurement object (3) on the three-dimensional measuring machine (1) to the control computer (6). It wasn't fully automated.

It is an object of the present invention to provide a control system of a three-dimensional measuring device which can completely automate the measuring work even for a measuring object without CAD data.

[0009]

The three-dimensional measuring control system according to the present invention is a three-dimensional measuring machine (1) equipped with a probe (2).
A CCD camera (9) for photographing the measured object (3) is arranged on the upper side, and the output signal of the CCD camera (9) is subjected to image processing to recognize the contour shape of the measured object (3), and the recognition is performed. Based on the result, generate the measurement path of the probe (2), and control computer
Teaching is done in (6).

[0010]

The two-dimensional plane (X-
When measuring the free curved surface of the measuring object (3) in the vertical direction (Z direction) by moving the probe (2) in the direction perpendicular to the (Y plane), the measuring object (3) is measured in three dimensions. X on machine (1)
-Installed on the Y plane, the measurement object (3) is photographed from the Z-axis direction by the CCD camera (9). CCD camera by this
By performing well-known image processing on the video signal output from (9), the position (XY coordinate) and X of the measurement object (3) can be obtained.
-The contour shape on the Y plane can be recognized.

Therefore, based on the recognition result, the measurement path of the tracing stylus (2) in the XY plane is generated. On this occasion,
For example, as shown in FIG. 3, the shape recognition result (contour shape Q) is obtained in each measurement cross section spaced at a constant pitch p in the X-axis direction.
The start point S and the end point E in the Y-axis direction are determined based on
The measurement path of (2) is generated.

After that, in the process in which the tracing stylus (2) moves from the starting point S to the ending point E in each measuring section, the position in the Z-axis direction along with the tracing movement of the tracing stylus (2) is measured at a constant sampling interval t. To do. As a result, the XY coordinate data and the actual measurement data in the Z-axis direction of each actual measurement point of the tracing stylus (2) are obtained.

[0013]

According to the control system of the three-dimensional measuring apparatus according to the present invention, the position and contour shape of the measuring object on the three-dimensional measuring machine are image-recognized even for the measuring object having no CAD data. Since the measurement path of the probe is automatically generated, the measurement work can be fully automated.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, on the three-dimensional measuring machine (1),
Three CCDs for photographing the measured object (3) from three axes
Cameras (9), (10) and (11) are installed, and the outputs of these cameras are supplied to the image processing device (12). A coordinate reference body (4) serving as a coordinate reference is installed on the three-dimensional measuring machine (1), and the three CCD cameras (9), (10) and (11) are used to measure the object (3). The pictures are taken on the same screen.

The image processing device (12) performs well-known image processing on each camera output to recognize the contour shape of the measurement object (3) on the three-view drawing.

The contour shapes on the three-view drawing thus recognized are supplied to the part program creating device (13) as two-dimensional shape data. Part program creation device (1
3) creates a part program (7) based on the two-dimensional shape data.

The created part program (7) is supplied to the control computer (6) to teach the measurement path of the tracing stylus (2).

As a result, the control device for the coordinate measuring machine (1)
(5) executes the control operation according to the command from the control computer (6), and the three-dimensional measurement of the object (3) by the coordinate measuring machine (1)
The dimensional shape is measured.

FIG. 2 shows a series of processes for creating a part program. After the measurement object is installed on the three-dimensional measuring machine, the measurement objects are photographed by the three CCD cameras (S1), and the image signal obtained by this is subjected to image processing for contour shape recognition ( S2).

Next, the contour shape recognized by the image processing is expressed in two-dimensional shape data (S3), and then a part program is created based on the two-dimensional shape data (S4).

FIG. 3 shows a specific procedure for creating a part program based on the two-dimensional shape data representing the contour shape S of the measured object (3). The measurement section C and its pitch p, the tracing direction D of the tracing stylus on the measurement section, and the data sampling interval t during the movement of the tracing are defined in advance.

First, based on the output signals of the three CCD cameras, the contour shape of the object (3) on the three-view drawing is recognized. At this time, the position of the coordinate reference body is defined as a coordinate origin O for image recognition. Then, the intersection point between the contour shape S on the XY plane and the plurality of measurement cross sections C is calculated, and the scanning direction D defined in advance is taken into consideration to measure the measurement start point S and the measurement end point E in each measurement cross section. To decide. Further, the measurement point T by the tracing stylus is determined by taking into consideration the sampling interval t which is defined in advance.

Next, 2 photographed in the X-axis direction and the Y-axis direction
Based on one contour shape, the movement path of the probe from the measurement end point E in one measurement section to the measurement start point S in the next measurement section is determined while checking the physical interference between the probe and the measurement object.

The part program creating device (13) creates a command for moving the probe while executing the above procedure, and combines these commands to complete a series of part programs (7). .

According to the above three-dimensional measuring device, the installation position of the measuring object on the three-dimensional measuring machine is recognized by image processing, and the part program is automatically created even for the measuring object having no CAD data. Therefore, the measurement work can be fully automated.

The above description of the embodiments is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope. The configuration of each part of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a three-dimensional measuring apparatus according to the present invention.

FIG. 2 is a flowchart showing a series of processes for creating a part program.

FIG. 3 is a diagram illustrating a procedure for determining a moving path of a probe.

FIG. 4 is a block diagram showing a configuration of a conventional three-dimensional measuring device.

[Explanation of symbols]

 (1) Three-dimensional measuring machine (2) Measuring element (3) Measuring object (4) Coordinate reference body (5) Control device (6) Control computer (7) Part program (8) CAD data (9) CCD camera

Claims (1)

[Claims] 1. A three-dimensional measuring machine (1) having a probe (2) to be moved along the surface of an object (3), and a control computer for numerically controlling the measurement path of the probe (2). In a three-dimensional measuring device comprising (6) and
A CCD camera (9) for photographing the measurement object (3) is arranged, and an output signal of the CCD camera (9) is subjected to image processing to measure the measurement object.
Recognizing the contour shape of (3), and measuring element based on the recognition result.
A control system for a three-dimensional measuring device, characterized in that the measurement path of (2) is generated and the control computer (6) is taught.