JPS60129605A - Measurement of shape - Google Patents

Abstract

PURPOSE:To facilitate judgement by visual inspection and numerals by drawing the shape of a product scanned by a laser light or an ordinary light or picked up by a TV camera at the same scale and view on a screen on which a designed shape is drawn with a computer system to measure the displacement of a graphic. CONSTITUTION:An object 1 to be measured is set in a space defined by a 3-D rectangular coordinate system and 3-axis rectangular movement units 10 and 19 equipped with a measuring TV camera 2 and a laser oscillator 18 are controlled with controllers 13 and 20 through a control box 14 to transmit positional information of the camera 2 and the oscillator 18 to a computer 5 through an I/O box or the like. In addition, the position information is converted into data for a shape from the view point of the camera 2 and a sectional shape irradiated with laser based on a designed shape data of an object 1 being measured stored into an external memory 6 by means of the computer 5 and is drawn on CRT4 at the same scale and view as the contour picked up by the camera and the sectional shaped scanned by a laser light.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a shape measuring method for comparing and measuring the amount of dimensional displacement between the designed shape of a product and the shape of a product processed based on design data.

[Background of the invention]

Conventionally, in order to account for manufacturing errors in products manufactured with arbitrary design dimensions, it is best to measure the absolute dimensions using a general measuring tool or a three-dimensional layout machine, and then compare them with the design values at every two measurement points. It was common. This method takes a lot of time to measure when the toe foot is composed of complex free surfaces, etc., and it is difficult to collect data on the error of the product shape with respect to the design shape as a continuous line. Therefore, it was not possible to visually determine whether the product shape or shape was a normal shape by measuring the shape at a minute or small site or by pattern MR.

[Purpose of the invention]

The purpose of the present invention is to measure the amount of dimensional displacement of the product shape from the designed shape in a short time when measuring the shape of a product that has a complex shape such as a free screen, by visual judgment using pattern recognition and fixed numerical data. The object of the present invention is to provide a shape measuring method that can be performed by.

[Summary of the invention]

The present invention provides a shape measuring method for measuring dimensional displacement between a designed shape of a product created based on data inputted by a computer system, etc., and a shape of a product processed based on the designed shape data. In line measurement, X resistance,
The acid 6f shape with a predetermined cross section according to the Iso system is drawn on the screen of the display device, and the cross-sectional shape of the product obtained by quantifying it with a laser beam at a predetermined position on the product is displayed as the designed shape on the screen of the display device. The amount of displacement of both figures drawn on the display device is measured by drawing them at the same scale and in the same field of view.In addition, in profile measurement, the design shape that shows the outline of the product on the screen of the display device is measured based on the design shape data. A contour line obtained by imaging the product using normal light at the same scale and same field of view as the design shape is depicted on the same screen of the display device, and the amount of displacement of both shapes is measured. It is something to do.

[Embodiments of the invention]

Embodiments of the present invention will be described based on the drawings. First, a method for measuring manufacturing errors with respect to the design shape of the external profile of a product to be measured will be described.

As shown in FIG. 1, an object to be measured 1 is fixed and set using a jig (not shown) in a space defined by a three-dimensional orthogonal coordinate system. A measurement television camera 2 that can move along these three axes (Y-axis, Y-axis, Z-axis) depicts the profile 3 of the object to be measured 1 at C) tT4 as shown in FIG.

10,000, the design shape data of the profile of the object to be measured l stored in the external storage device of the computer is processed by the computer 5 so that it becomes an image from the same viewpoint of the object to be measured l of the aforementioned television camera 2. This is displayed as a regular profile 3A of the object to be measured 1 on the screen of the camera T4 shown in FIG.

If we measure the difference in the dimensions of this profile 3.3A, we get
It is possible to measure manufacturing errors with respect to the designed shape of the external profile of the object to be measured 1.

In addition, when detailed dimensional error measurements are performed, the image of profile 3 is enlarged using the zoom lens of the television camera 2, as shown in FIG. By increasing the magnification to the same magnification as Profile 3, which was enlarged through the calculation process, and comparing these, the detailed shape can also be measured.

Next, a method for measuring the cross-sectional shape of the building 1 to be measured will be described.

As shown in Fig. 4, the cross-sectional area to be measured of the object 1 placed in the dark room in the same coordinate system as in the profile measurement described above is scanned with the extremely finely focused V-the beam 7. , the laser beam 7 is irradiated onto the object to be measured □, and the shining linear image 8 is captured by the TV camera 2 as a continuous line image, and the CR
It is drawn on the T screen.・Next, in □, the computer calculates and draws the normal cross-sectional shape based on the design data stored in the external storage device at the laser beam scanning cross-sectional position of the object to be measured as seen from the TV camera's point of view. , as shown in Figure 8, a cross section line 9 is drawn on the screen of CR'T4.
Describe. After that, in the same way as the profile measurement described above, the difference in the dimensions of the two cross sections #8.90 drawn on the screen of C) t 1' 4 is measured, and the manufacturing error with respect to the design shape of the product shape of the object to be measured is measured. Measure.

Next, FIG. 6 shows the configuration of a shape measuring device to which the present invention is applied. In the same figure, a measurement television camera 2 that captures an image of an object to be measured is attached to a three-axis orthogonal moving device 10 so that it can be moved arbitrarily on orthogonal coordinates. 11 is a slide shaft for each axis in the three-axis orthogonal moving device 10;
12 is a pulse motor with an encoder and a hypotension meter for each axis. lj is a controller that drives and controls the three-axis orthogonal moving device 10, and 14 is its operation box. - The position information of the measurement television camera 2 that was arbitrarily operated is
The design shape data of the object to be measured 1 transmitted from the encoder 12 to the computer 5 via the controller 13 and box 15 and stored in the external storage device 6 is converted into an image seen from the camera viewpoint. Process the calculations as follows, and C
The light is displayed on the RT 4 and plotted on the plotter 16. Reference numeral 17 denotes a measurement television camera 20 control device, which transmits video information from the television camera 2 to the CI″tT4.

Reference numeral 18 denotes a laser oscillator with an extremely narrow beam diameter, which is attached to another 3-axis orthogonal movement device 19 installed in the same coordinate system as the measurement television camera 2, and controlled by a controller 20, and which is controlled by a controller 20. can be scanned. The cross-sectional irradiation position with the laser beam is determined by operating the operation box 14, and the position information is transmitted to the computer 5 via the I10 box 15. Based on the design shape data stored in the external storage device 6, the computer 5 generates a drawing at a position where the cross section of the target building l is irradiated with laser light. - Calculate the surface shape by calculation. On the other hand, the position of the measuring television camera 2 at this time was communicated to the computer 5, and the cross-sectional shape and shape on the drawings were roughly shown on the main island.
Convert to the viewpoint of C) LT4"=d; L1, .8,
4゜. 1Ktillilfi? g. By measuring the amount of dimensional displacement between the image determined by the 6 data processing and the direct image from the measurement television camera, the difference between the design shape and the product shape can be measured. The same applies to profile measurement.

〔Effect of the invention〕

According to the present invention, the dimensional change position between the design shape and the product shape can be measured accurately in a short time.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the principle of profile measurement in the present invention, Figure 2 is a diagram showing the profile measurement results drawn on a CRT screen, and Figure 3 is a partial enlargement of the profile figure in Figure 2. Figure 4 shows the principle of cross-sectional shape measurement according to the present invention, Figure 5 shows the results of cross-sectional shape measurement depicted on the screen, and Figure 6 shows the state depicted on the screen. FIG. 1 is a block diagram showing the configuration of a shape measuring device for implementing the present invention. l...object 1] fixed object, 2...TV camera for measurement,
4...C)LT, 5...Computer, 6...External storage device, 10...3-axis moving device, 13.2O...
·controller. tB4 Figure Z Figure 5 Figure 6 Figure 16 '10

Claims (1)

[Claims] In a shape measurement method that measures the six dimensions and normal displacements of the design shape of a product created based on data and data input by a computer, such as CineTem, and the shape of a product processed based on the design shape. In measuring the cross-sectional contour line, the cross-sectional shape of the product is obtained by drawing the design shape of the predetermined cross-section on the screen of the display device using a computer system and scanning the predetermined position of the product with -1. are drawn on the screen of the display device at the same scale and with the same field of view as the design shape, and both figures are drawn on the display device. In addition, in profile measurement, a design shape showing the outline of the product is drawn on the screen of the display device based on the design shape data, and the product is illuminated using normal light at the same scale as the design shape. A shape measuring method characterized in that a contour line obtained by imaging in a field of view is drawn on the same 〒m plane of the display device, and the amount of displacement of both figures is measured.