JP2858820B2 - Automatic Dimensional Measurement of Charpy Specimens - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an automatic dimensional measurement method for a material test piece. The present invention relates to a method for automatically measuring a material test piece which can be spread and secure a processing time suitable for production.

[Conventional technology]

Conventionally, the measurement of the shape of the notch part of the Charpy test piece has been performed manually, the bottom height is micrometer, and the bottom radius is enlarged with a projector and visually checked to see if it is within the specified dimensional tolerance. Had been determined.

[Problems to be solved by the invention]

Conventionally, the measurement of this kind of highly accurate test piece has been performed manually by a skilled person, and has been one of the nets of automation.

In particular, when measuring the bottom height during the work, it is feared that minute burrs, cutting oil and dust on the curvature of the notch bottom may adversely affect the measured value, so remove it carefully. Must have been through a lot of effort.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic measuring method for a sharpie test piece which can automatically perform various measurements of the test piece without manual operation.

[Means for solving the problem]

In the present invention, when calculating the bottom height H of the notch, an arc is ideally assumed. On the other hand, in the visual field A force of the image processing, the cursor C is moved in the Y-axis direction and set at a position where the ratio of F to E becomes arbitrary. The E dimension here is the visual field width dimension of the image processing. , An arbitrary constant. The bottom position D on the arc is obtained by subtracting the dimension G determined by the ratio of F to E from the Y coordinate position of the cursor. To find the base radius r,
A point on the arc of the image is sampled, a center of curvature J is obtained from the coordinates, and a distance is calculated for each point sampled in reverse from the obtained center J to obtain a base radius r.

[Action]

Point D obtained from the Y coordinate of the cursor C and the G dimension
Is a position assuming an ideal circular arc, so even if there is a fine burr, oil, or dust adhering to the vicinity of D, which has no problem as a test piece, the calculation can be omitted.

As for the number of sampling points, the greater the number of points, the higher the measurement accuracy, and an accuracy close to pattern matching can be obtained.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

A method of calculating the bottom height H of the V notch will be described with reference to FIG. The bottom height H is the Y coordinate K of the side and the bottom D of the notch arc.
Is subtracted from the Y coordinate of.

How to obtain the D and Y coordinates in this case will be described. The cursor C is moved in the Y-axis direction in the visual field A of the image processing to find a position where the ratio of F to E becomes 0.2. E is an arbitrary dimension. Here, when E is 500 μm, the F dimension is 100 μm.
m. On the other hand, the base radius of the V notch is 0.25mm
Assuming an ideal circle of, the F dimension corresponding to the length of the string is 100μ
When the distance is m, the distance G between the Y coordinate of the cursor C and the bottom Y coordinate of the circle in FIG. 1 is 5 μm. That is, the Y coordinate of the base D is obtained as a value obtained by subtracting G from the Y coordinate of the cursor position C.

As described above, the Y coordinate of D can be calculated in a state where the object having a size of 5 μm or less attached to the bottom of the circle is omitted.

The method of calculating the bottom radius r of the V notch will be described with reference to FIG. Using five points on the arc as sampling points, the X and Y coordinates of each point are obtained from the image. I was asked
The coordinates of the center of curvature J are calculated by the successive approximation method of the least squares method based on the X and Y coordinates. When the coordinates of the center J are obtained, the length between the five sampling points is calculated, the value is regarded as the base radius r, and it is determined whether each measured value is within the allowable value.

Referring to FIG. 3, the processing agent and the test piece 6 are placed at a test piece supply position 8 by a handling device represented by a robot hand, and the test piece take-out device 1 grasps the test piece 6 and moves it to a predetermined position. After measuring the width W with the width measuring gauge 3, the height T of the test piece is measured with the height measuring gauge 5.
Simultaneously with the measurement, the width W and height T of the Charpy test piece shown in FIG.
After image processing, the total length L, the torch length L / 2, the bottom height H, the angle α shown in FIG. 4 (b), the bottom radius r, the bottom width B shown in FIG. A pass / fail judgment is made as to whether or not each dimension is within a prescribed dimension range, and the test piece 6 performs a series of operations up to the robot removal position 7 of the test piece removal device 2.

Further, it has a function of determining whether or not the measured value is within an allowable value, and, when the measured value exceeds the allowable value, stopping the corresponding machining center that has processed the test piece.

In addition, there are V notches and U notches depending on the shape of the groove in the sharpy test piece.
Applicable to both V and U notches.

〔The invention's effect〕

In the present invention described above, the notch portion bottom height can be measured without minute burrs, oils and dusts, which not only enables the automatic measurement, but also widens the restricted range of the measurement place,
In addition, the bottom radius measurement method not only enables automatic measurement, but also can reduce the measurement time. Furthermore, by introducing these dimensions to the shearing processing line, abnormalities in the processing line can be checked, preventing the occurrence of a large number of defective products beforehand, and the automatic measurement of the dimensions of individual test specimens, which was conventionally performed manually. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a V notch for obtaining a bottom height H of the present invention, FIG. 2 is an explanatory view of obtaining a bottom radius r of a V notch portion in FIG. 1, and FIG. FIG. 4 is a configuration diagram showing an embodiment of a test piece measuring device, and FIG. 4 is an explanatory diagram showing measurement items and measuring means of a sharpy test piece. A: field of view for image processing, C: cursor, D: bottom position, E: field width (variable), F: chord length, H: bottom height, G: F / E = 0.2 , The distance of the Y coordinate of DC at the time of
… V notch base radius, J …… Curvature center coordinate, W …… Width
T: height, L: full length, α: angle, B: bottom width (U
R) Bottom radius (for U notch).

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryusuke Abe 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Hitachi, Ltd. Hitachi Plant Co., Ltd. (72) Inventor Hitoshi Tsujihiro 4-3-1 Kanda Surugadai, Chiyoda-ku, Tokyo No. Hitachi Techno Engineering Co., Ltd. (72) Inventor Kozo Maeda 1 Kobe-cho, Fukuyama City, Hiroshima Prefecture Nippon Steel Pipe Co., Ltd. Fukuyama Works (72) Inventor Shigeru Tsuchiya 1 Kobe-cho, Fukuyama City, Hiroshima Prefecture Nippon Steel Pipe Co., Ltd. Fukuyama Works (56) References JP-A-2-296130 (JP, A) JP-A-57-178133 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01B 11/00 -11/30 G01N 3/00-3/62

Claims (2)

(57) [Claims] 1. A method according to claim 1, wherein said notch portion of said test piece is measured by using image processing in the measurement of dimensions such as bottom height and bottom radius. Automatic dimensional measurement of test pieces. Assuming that the visual field width E and the length F of the chord where the cursor line C intersects the groove, (1) Find the F dimension by finding the position where the ratio of F to E becomes 0.2. (2) The distance G between the bottom of the groove and the cursor is obtained from the dimension F and the radius r of the groove. (3) The value obtained by subtracting G from the Y coordinate of the cursor C is the base height H. (4) The base radius r or R is obtained by sampling three or more points on the arc of the image, determining the center of curvature J from the coordinates, calculating the distance between each sampled point in reverse to the determined J, Find the bottom radius r or R. (5) The total length L, notch length L / 2, V-groove angle α, and bottom width B (U notch) obtained by other image processing of r, R, and H are obtained by calculating the respective coordinate positions. 2. An automatic measurement is performed by the dimension measuring method according to claim 1, and a pass / fail judgment is made as to whether or not the measured value is within an allowable value. When the measured value exceeds the allowable value, the corresponding test piece is processed together with an alarm. An automatic test piece processing system with a system that stops the machine.