JP7345765B2 - Dimension measuring device for ring-shaped products and method for measuring dimensions of ring-shaped products - Google Patents

Description

The present invention relates to a dimension measuring device for a ring-shaped product such as an O-ring, and a method for measuring the dimension of a ring-shaped product.

Conventionally, as a dimension measuring device for ring-shaped products, an O-ring measuring device in which a synthetic resin plate is formed into a conical shape and scales are carved at equal intervals in the generatrix direction is known (see, for example, Patent Document 1). .

Further, the dimensions of ring-shaped products are measured by measuring the circumference using an image measuring device, measuring an approximate circle, or measuring an approximate circle using a stereoscopic measuring microscope.

Utility Model Publication No. 3-25102

However, manually measuring the inner diameter of an O-ring using an O-ring measuring device as disclosed in Patent Document 1 is very time-consuming and has low production efficiency.

Furthermore, burrs are generated in ring-shaped products such as O-rings during molding, but the inner diameter or outer diameter is defined by removing burrs.

With conventional image measuring instruments, if transmitted light illumination is used, the measured value will include burrs, and if reflected light illumination, such as ring illumination that irradiates light from above, is used, the boundary point designation of burrs will not be stable. As a result, an offset will be added to the measured value or it will vary widely.

With a stereoscopic measuring microscope, the measurement points are determined by a person, so there are variations in the measurement values, and the measurement values may differ depending on the operator.

As described above, there is a problem in that it is difficult to correctly detect the boundary point between the burr and the product.

The present invention has been made in view of these points, and its purpose is to automate the measurement of deburring dimensions of ring-shaped products, thereby improving productivity and evaluation technology.

In order to achieve the above object, in the present invention, measurement light is irradiated obliquely to obtain a profile that includes the boundary point with the burr of the ring-shaped product.

Specifically, in the first invention, a ring-shaped product to be measured is placed on a mounting surface of a rotatable turning table,
moving an optical profile measuring device so as to irradiate the ring-shaped product placed on the mounting surface of the rotating table with measurement light from a position inclined at a predetermined angle;
A profile including a boundary point with a burr on the ring-shaped product is obtained from a measurement value obtained by the optical profile measuring device while rotating the rotation table.

According to the above configuration, data on the profile of the ring-shaped product is acquired while acquiring data on the burr boundary points, so the area where burrs are generated can be accurately grasped. At least one of the outer diameters can be automatically and accurately measured.

In the second invention, in the first invention,
The structure is such that the measurement value for one circumference of the ring-shaped product is obtained, and after determining the boundary point with the burr, at least one of the inner diameter and outer diameter of the ring-shaped product without the burr is measured. .

According to the above configuration, at least one of the inner diameter and outer diameter of the ring-shaped product can be measured in a portion without burrs by acquiring the measured value of the profile of the ring-shaped product for one round.

In the third invention, in the first or second invention,
At least one of the inner diameter and outer diameter of the ring-shaped product without burrs is measured from the cross-sectional profile of one round at predetermined intervals in the circumferential direction of the ring-shaped product.

According to the above configuration, the circumferential length is the length that connects the measured values of the profile of the ring-shaped product for one circumference of the part without burrs, so by dividing it by pi, the inner diameter and outer diameter can be easily determined automatically. can be obtained.

In a fourth invention, in any one of the first to third inventions,
The measurement value for one rotation of the ring-shaped product is obtained, and the wire diameter of the ring-shaped product is also measured.

According to the above configuration, since the profile of the ring-shaped product for one round is acquired, the wire diameter can also be automatically and easily acquired.

In a fifth invention, in any one of the first to fourth inventions,
A reference profile serving as a reference for the ring-shaped product is registered in advance, and a region where a burr boundary point is expected to be present is specified.

According to the above configuration, the position of the burr boundary point can be estimated from the reference profile that serves as a reference for the ring-shaped product, making it difficult to obtain an incorrect point and stabilizing the measurement.

In a sixth invention, in any one of the first to fifth inventions,
The coordinates of the optical profile measuring instrument and the above-mentioned mounting surface are determined from a state where there is nothing on the mounting surface of the above-mentioned turning table and a state where a ring gauge whose dimensions are registered in advance is placed on the mounting surface of the above-mentioned turning table. The structure should be such that the relationships are understood.

According to the above configuration, the profile of the ring-shaped product can be obtained by converting the data obtained by the optical profile measuring device into the coordinates of the mounting surface of the rotating table.

In a seventh invention, a rotatable turning table on which a ring-shaped product is placed;
An optical profile measuring device that measures the profile of the ring-shaped product by irradiating measurement light onto the ring-shaped product placed on the rotation table from a position inclined at a predetermined angle with respect to the mounting surface of the rotation table. and,
a measuring device positioning mechanism for moving the optical profile measuring device;
and a control unit that acquires a profile including a boundary point with the burr of the ring-shaped product from the measurement value obtained by the optical profile measuring device while rotating the rotation table.

According to the above configuration, the measuring device positioning mechanism moves the position of the optical profile measuring device to an appropriate position and acquires the profile data including the boundary point with the burr. At least one of the inner diameter and outer diameter of a shaped product can be automatically and accurately measured.

As described above, according to the present invention, it is possible to automate the measurement of deburring dimensions of a ring-shaped product, thereby improving productivity and evaluation technology.

FIG. 1 is a perspective view showing a dimension measuring device for a ring-shaped product according to the present embodiment. FIG. 1 is a plan view showing a dimension measuring device for a ring-shaped product according to the present embodiment. FIG. 1 is a front view showing a dimension measuring device for a ring-shaped product according to the present embodiment. FIG. 1 is a side view showing a dimension measuring device for a ring-shaped product according to the present embodiment. It is a figure showing the relationship between a laser displacement meter and each coordinate axis. FIG. 3 is a diagram showing how a profile is acquired by a distance measuring laser. It is an enlarged sectional view showing a ring-shaped product. FIG. 3 is a cross-sectional view showing the relationship between the laser irradiation direction and the ring product. FIG. 3 is a diagram showing the relationship between the laser irradiation direction, inflection points, etc. in the profile. FIG. 2 is a perspective view showing an outline of how calibration is performed using a ring gauge. FIG. 6 is a diagram showing the positional relationship of each acquired boundary point on the rotation table. It is a figure which shows the relationship between a profile and a complementary point when there is no boundary point.

Embodiments of the present invention will be described below based on the drawings.

-Configuration of dimension measuring device-
1 to 4 show a dimension measuring device 1 for a ring-shaped product P according to an embodiment of the present invention. This dimension measuring device 1 has, for example, a rectangular plate-shaped base plate 2, and this base plate 2 is not shown. It is fixed to the fixed member 2a via vibration isolating rubber or the like. The configuration of the base plate 2 is not limited to this.

The base plate 2 is rotatably provided with a turning table 3 having a circular placing surface 3a on which the ring-shaped product P is placed. The turning table 3 is turned at a predetermined speed by, for example, a rotary actuator 3b provided on the base plate 2.

Although only a portion is shown in order to make the essential parts easier to see, the base plate 2 is provided with a measuring device positioning mechanism 5 for moving a laser displacement meter 4 as an optical profile measuring device, which will be described later. For example, the measuring device positioning mechanism 5 includes a mounting angle changing bracket that fixes the laser displacement meter 4 at a predetermined angle, a gantry frame that movably supports the mounting angle changing bracket to a predetermined position, and a gantry frame that moves the gantry frame. It is equipped with an actuator 7, a motor 8, a linear guide 9, a high-precision XY stage, etc.

With this measuring device positioning mechanism 5, the laser displacement meter 4 is placed on the turning table 3 from a position inclined at a predetermined inclination angle α (for example, α=30°) with respect to the mounting surface 3a of the turning table 3. The ring-shaped product P is irradiated with measurement light to measure the profile of the ring-shaped product P.

The entire dimension measuring device 1, including the rotary actuator 3b, the measuring instrument positioning mechanism 5, and the laser displacement meter 4, is controlled by a control section 6 such as a microcomputer.

Then, as will be described in detail later, the control unit 6 determines the burr boundary point C where the burr formed on the ring-shaped product P exists based on the measurement value obtained by the laser displacement meter 4 while rotating the turning table 3. Configured to retrieve profiles that contain data.

-Operation of dimension measuring device-
Next, the operation of the dimension measuring device 1 for a ring-shaped product P according to this embodiment will be explained.

First, as shown in FIGS. 1 to 4, a ring-shaped product P to be measured is placed on the mounting surface 3a of the rotatable turning table 3.

Next, using the measuring instrument positioning mechanism 5, the laser is displaced so that the ring-shaped product P placed on the mounting surface 3a of the turning table 3 is irradiated with measurement light from a position inclined by an angle α=30°. Move a total of 4.

Incidentally, in advance, the Z-axis and the angle α are measured from a state where there is nothing on the mounting surface 3a of the turning table 3, and the inclination is calibrated. Then, as shown in FIG. 10, a ring gauge G whose shape has been input into the control unit 6 in advance is placed on the mounting surface 3a of the turning table 3, and the values of the linear scale (not shown) and the laser displacement meter 4 are measured. It is advisable to perform diameter calibration to understand the positional relationship between the laser displacement meter 4 and the turning table 3 based on measured values such as the inclination angle. Furthermore, a reference profile serving as a reference for the ring-shaped product P may be registered in advance, and an area where the burr boundary point C is expected to be located may be specified.

Next, while rotating the turning table 3, the laser displacement meter 4 irradiates a laser beam as measurement light and captures the reflected light, thereby transmitting the measured value obtained by the laser displacement meter 4 to the control unit 6 at any time. .

Specifically, as shown in FIG. 5, the laser displacement meter 4 performs measurement using a distance measuring laser band having a predetermined width. The angle α between the origin of the laser displacement meter and the mounting surface 3a is not limited to 30°, but may be larger or smaller than that, and may be, for example, 45°. This makes it possible to accommodate various shapes and sizes of ring-shaped products P.

As shown in FIG. 6, when the laser displacement meter 4 irradiates a distance measuring laser band as measurement light, profile data representing a part of the outer peripheral shape of the ring-shaped product P, which is shaped like a thick line, is acquired. As shown by a black circle in FIG. 7, the burr boundary point C is located at the corner of the intersection between the root of the burr and the outer peripheral surface on the laser displacement meter 4 side.

As shown in FIGS. 8 and 9, by repeating the process of acquiring data at predetermined intervals while rotating the turning table 3, it is possible to eliminate burrs formed on the ring-shaped product P for one revolution. A profile including data at the burr boundary point C (near α=90°) is acquired. If the boundary point C is not found (in other words, if there is no burr), the control unit 6 determines the outer and inner circumferences from the obtained profile data in the range α=60° to 85°, as shown in FIG. A virtual arc can be formed for any of the above, and a value located at α=90° is obtained. For example, when data is acquired every turning angle θ=1°, data at 360 points is acquired. Note that the data acquisition interval is not limited, and for example, 3600 points may be acquired at each θ=0.1°.

Based on the configuration of the mold for a ring-shaped product P such as an O-ring, it can be almost predicted that the area where burrs will occur is near the mating surfaces of the mold. Therefore, as shown in FIG. 9, the burr boundary point C is predicted to be around α=85° to 95°. Note that the outer limit is α=-35° due to the relationship of the laser distance measurement band.

Then, or simultaneously, the control unit 6 converts the coordinates of the laser displacement meter 4 into stage coordinates from the obtained measurement values. As described above, in order to acquire the data of the burr boundary point C while rotating the rotation table 3, the control unit 6 acquires the data while making the current angle θ of the rotation table 3 correspond to the coordinates of the burr boundary point C. .

For example, as shown in FIG. 11, the perimeter is the value obtained by integrating the distances between 360 points for one round in a burr-free area. By dividing this circumference by pi, the diameter (inner diameter or outer diameter) is calculated.

The wire diameter can also be acquired at the same time. For example, assuming that the position of the mounting surface 3a is 0, the height when α=0° is the wire diameter.

In this way, in this embodiment, since the profile data of the ring-shaped product P including the data of the burr boundary point C is acquired, at least one of the inner diameter and outer diameter of the ring-shaped product P excluding the burr can be automatically determined. Can be measured accurately. That is, only the inner diameter of the ring-shaped product P excluding burrs may be measured, only the outer diameter may be measured, or both may be measured depending on the case. When measuring both, for example, the outer diameter may be measured by moving the laser displacement meter 4 in the X direction after measuring the inner diameter.

Conventional image dimension measuring instruments and stereoscopic measuring microscopes, for example, acquire the profile of the measurement area of the entire mounting surface of the rotating stage by shading, or select the boundary points of the burr after looking at it, and then calculate the profile from a set of points. Calculate dimensions.

On the other hand, in this embodiment, data of the profile of the ring-shaped product P including data of the burr boundary point C is acquired while the position of the laser displacement meter 4 is moved to an appropriate position by the measuring device positioning mechanism 5. Therefore, at least one of the inner diameter and outer diameter of the ring-shaped product P excluding burrs can be automatically and accurately measured.

Furthermore, since the profile of the ring-shaped product P for one round is acquired, the wire diameter can also be easily acquired.

Further, the area where burrs occur is constant in the mold for molding the ring-shaped product P, and the area can be estimated from the reference profile, so it is difficult to obtain erroneous points and the measurement is stable.

Therefore, according to the dimension measuring device 1 for a ring-shaped product P according to the present embodiment, it is possible to automate the measurement of the deburring dimension of the ring-shaped product P, thereby improving productivity and evaluation technology.

This not only improves productivity by saving labor and reducing man-hours, but also improves evaluation techniques by reducing variation and reducing differences between testers. In addition, it is expected that the eyes will be tired from looking through a stereoscopic measuring microscope and that training for certified personnel will not be necessary.

(Other embodiments)
The embodiments of the present invention may have the following configurations.

That is, in the embodiment, a microcomputer has been described as an example of the control unit 6 (controller). However, the control unit 6 may be physically configured in any manner as long as it controls the “dimension measuring device 1”. For example, the control unit 6 may use software (program), such as a microcomputer or a programmable logic controller (PLC). Alternatively, the control unit 6 may be realized by combining hardware (circuit components).

Note that the above embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its applications, or uses.

1 Dimension measuring device
2 Base plate
2a Fixed member
3 Rotating table
3a Placement surface
3b Rotary actuator
4 Laser displacement meter (optical profile measuring device)
5 Measuring instrument positioning mechanism
6 Control section
7 Actuator
8 motor
9 Straight guide

Claims (8)

Place the ring-shaped product to be measured on the mounting surface of a rotatable turning table,
moving an optical profile measuring device so as to irradiate the ring-shaped product placed on the mounting surface of the rotating table with measurement light from a position inclined at a predetermined angle;
A method for measuring dimensions of a ring-shaped product, which obtains a profile including data of boundary points with burrs of the ring-shaped product from measurement values obtained by the optical profile measuring device while rotating the rotation table, the method comprising:
Obtain measurement values for one circumference of the ring-shaped product, grasp the boundary point with the burr, and then measure at least one of the inner diameter and outer diameter of the ring-shaped product without the burr.
A method for measuring the dimensions of a ring-shaped product. Place the ring-shaped product to be measured on the mounting surface of a rotatable turning table,
moving an optical profile measuring device so as to irradiate the ring-shaped product placed on the mounting surface of the rotating table with measurement light from a position inclined at a predetermined angle;
A method for measuring dimensions of a ring-shaped product, which obtains a profile including data of boundary points with burrs of the ring-shaped product from measurement values obtained by the optical profile measuring device while rotating the rotation table, the method comprising:
A ring-shaped product characterized in that at least one of the inner diameter and outer diameter of the ring-shaped product without burrs is measured from the cross-sectional profile of one circumference at predetermined intervals in the circumferential direction of the ring-shaped product. How to measure product dimensions. Place the ring-shaped product to be measured on the mounting surface of a rotatable turning table,
moving an optical profile measuring device so as to irradiate the ring-shaped product placed on the mounting surface of the rotating table with measurement light from a position inclined at a predetermined angle;
A method for measuring dimensions of a ring-shaped product, which obtains a profile including data of boundary points with burrs of the ring-shaped product from measurement values obtained by the optical profile measuring device while rotating the rotation table, the method comprising:
A method for measuring dimensions of a ring-shaped product, characterized in that a measurement value for one circumference of the ring-shaped product is obtained, and a wire diameter of the ring-shaped product is also measured. 4. The ring-shaped product according to claim 1, wherein a reference profile serving as a reference for the ring-shaped product is registered in advance, and a region where a burr boundary point is expected to be present is specified. How to measure product dimensions. The coordinates of the optical profile measuring instrument and the above-mentioned mounting surface are determined from a state where there is nothing on the mounting surface of the above-mentioned turning table and a state where a ring gauge whose dimensions are registered in advance is placed on the mounting surface of the above-mentioned turning table. 5. The method for measuring dimensions of a ring-shaped product according to claim 1 , characterized in that the relationship is grasped in advance. a rotatable turning table on which a ring-shaped product is placed;
An optical profile measuring device that measures the profile of the ring-shaped product by irradiating measurement light onto the ring-shaped product placed on the rotation table from a position inclined at a predetermined angle with respect to the mounting surface of the rotation table. and,
a measuring device positioning mechanism for moving the optical profile measuring device;
Obtaining a profile including the boundary point with the burr of the ring-shaped product from the measurement value obtained by the optical profile measuring device while rotating the turning table;
a control unit that acquires measurement values for one circumference of the ring-shaped product, grasps the boundary point with the burr, and then measures at least one of the inner diameter and outer diameter of the ring-shaped product without the burr; A dimension measuring device for a ring-shaped product, comprising: a rotatable turning table on which a ring-shaped product is placed;
An optical profile measuring device that measures the profile of the ring-shaped product by irradiating measurement light onto the ring-shaped product placed on the rotation table from a position inclined at a predetermined angle with respect to the mounting surface of the rotation table. and,
a measuring device positioning mechanism for moving the optical profile measuring device;
Obtaining a profile including the boundary point with the burr of the ring-shaped product from the measurement value obtained by the optical profile measuring device while rotating the turning table;
and a control unit that measures at least one of the inner diameter and outer diameter of the ring-shaped product without burrs from the cross-sectional profile of one circumference at predetermined intervals in the circumferential direction of the ring-shaped product. A device for measuring dimensions of ring-shaped products . a rotatable turning table on which a ring-shaped product is placed;
An optical profile measuring device that measures the profile of the ring-shaped product by irradiating measurement light onto the ring-shaped product placed on the rotation table from a position inclined at a predetermined angle with respect to the mounting surface of the rotation table. and,
a measuring device positioning mechanism for moving the optical profile measuring device;
Obtaining a profile including the boundary point with the burr of the ring-shaped product from the measurement value obtained by the optical profile measuring device while rotating the turning table;
A dimension measuring device for a ring-shaped product, characterized in that it is equipped with a control unit that acquires the measurement value for one circumference of the ring-shaped product and also measures the wire diameter of the ring-shaped product..

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