JP2678668B2 - Dimension measurement method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a dimension measuring method for a molded product in an unfinished state. Specifically, the dimension measuring is automatically performed by using laser slit light and image processing in combination. The present invention relates to a method for measuring dimensions.

[Prior Art] Conventionally, in the dimension measurement of a molded product with a burr that is in an unfinished state after molding, since the entire shape is confused by the burr and it is difficult to confirm the end face, only an inaccurate measurement result can be obtained. I couldn't get it.

In order to eliminate this, it is necessary to give strong illumination to clearly capture the contour, or to remove burrs from individual molded products after molding and finish the dimensional measurement.

[Problems to be Solved by the Invention] However, in the illumination method described above, the shape of the molded product to be measured. Since the illuminance changes depending on the color etc., it is troublesome to adjust, and in the measurement method without burrs, when the measurement using image processing by the CCD camera is performed, it is measured with a flat image and the remaining portion of the burr is measured. It was not possible to eliminate the major drawback that makes it difficult to determine the end face of the molded product and makes automatic measurement difficult.

It is an object of the present invention to eliminate such drawbacks and provide a dimension measuring method capable of performing accurate measurement by combining an extremely small amount of partial illumination and image processing discrimination.

[Means for Solving the Problems] The present invention will be described in detail with reference to the drawings. As shown in FIG. 1, there is provided a method for measuring a dimension of a molded product 2 having a burr 1 formed by curing a surplus material during molding. In the measured cross-section direction of the molded product 2, a laser slit collimated light 3 having a width of several μ and passing through the slit 7 was obliquely irradiated by a laser projecting device 4 by θ °, and as shown in FIG. The bending point X at the portion where the light streak 5 shown on the measurement surface moves from the end of the molded product 2 to the burr 1 is recognized by the image processing of the CCD camera 6, and one bending point X of the molded product 2 is recognized.
It is characterized in that the dimension from to one bending point X'is measured.

[Operation] The operation of the present invention will be described with reference to the drawings.

First, the formed unfinished molded product 2 is placed on a movable table 8 having, for example, XY axes as shown in FIG. Next, a laser beam collimated light 3 having a width of several μ is obliquely irradiated to the dimension measuring portion of the molded product 2 so as to raise the light streaks 5 on the molded product 2 as shown in FIG. 5 is bent at a portion having irregularities, that is, a portion which moves to the burr portion 1, this bending point X is enlarged about the inner and outer peripheral portions, an image is taken into the CCD camera 6, and the distance between the other bending point X'is measured. To obtain accurate inner and outer circumference points.

[Embodiment] In carrying out the present invention, the molded product 2 to be measured has a greater utility value when it has a complicated structure rather than a planar simple structure as shown in the figure. The measurement range is wide because it does not need to be.

[Advantages of the Invention] With the above-described configuration of the present invention, it is possible to perform automatic measurement by a measuring device, which has been conventionally dimensionally measured by artificial judgment. Therefore, it becomes possible to perform stable and accurate measurement by eliminating human measurement error and individual difference.

In addition, measurement with good reproducibility became possible, and high repeatability was achieved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the measuring method of the present invention. FIG. 2 is a plan view of the molded product. 1 ... Burr, 2 ... Molded product, 3 ... Laser slit parallel light, 4 ... Laser projection device, 5 ... Light streaks, 6 ...
CCD camera, 7 ... slit, 8 ... table, XX '...
… Bending point

Claims (1)

(57) [Claims] 1. A laser slit collimated light 3 having a width of several μ and obliquely passing through a slit 7 at an angle of θ ° by a laser projecting device 4 is irradiated to a measurement cross section direction of a molded product 2 having an arbitrary burr 1 left. As a result, the bending point X at the portion where the light streak 5 on the molded product 2 moves from the end of the molded product 2 to the burr portion 1 is set.
A dimension measuring method characterized by recognizing by image processing of the CCD camera 6 and measuring a dimension from one of the bending points X to the other bending point X '.