KR20070067512A - Automatic inspection machine and method of outer specification of 3 dimensional structure - Google Patents

Abstract

An apparatus for automatically inspecting the outer size of a three-dimensional structure is provided to precisely measure the outer size of the three-dimensional structure such as a vehicular pulley. An apparatus for automatically inspecting the outer size of a three-dimensional structure includes a rotation unit, a stage unit, an inner and outer mirror laser(264), and a profile laser(274). An object is positioned on the rotation unit to be rotated. The stage unit moves the rotation unit in X-, Y-, and Z-directions. The inner and outer mirror laser is installed at a position where the side shape of the object can be observed from a side and includes a tilting stage capable of tilting the observation angle. The profile laser is installed at a position where the upper shape of the object can be observed from the upper side and includes a manual stage capable of moving the horizontal position.

Description

Automatic inspection machine and method of outer specification of 3 dimensional structure}

1 is a view for explaining the inspection technology of the pulley using a conventional vision system,

2 is a view for explaining the inspection technique of the pulley using a conventional contact displacement meter,

3 is a photograph of a typical automotive pulley,

4 is a cross-sectional view of the profile shape for the upper cross section of the pulley,

5 is a configuration diagram of an external standard automatic inspection device of a three-dimensional structure according to the present invention.

Explanation of symbols on the main parts of the drawings

100: pulley

110: computer

120: camera

122: focus

130: contact displacement sensor

132: contact point

200: automatic inspection device

210: pedestal

220: XYZ stage

230: motor

240: holder

250: Chuck

260: support pillar

262: tilting stage

264: inside and outside diameter laser

270 support pillar

272: manual XY stage

274: profile laser

The present invention relates to an automatic inspection apparatus for external dimensions of a three-dimensional structure, and more particularly, to an automatic inspection apparatus for external dimensions that can accurately and accurately measure all external dimensions of a three-dimensional structure such as an automobile pulley. will be.

In general, it is important to precisely measure and inspect the external dimensions of structures having three-dimensional shapes. For example, in the case of the vehicle pulley shown in Fig. 3, it is necessary to accurately measure the external dimensions in order to verify the dimensional compatibility with other parts connected thereto. Although the three-dimensional structure is very diverse, for the sake of convenience of explanation, the description will be made for a pulley for a vehicle in which various inspection dimension items are known. However, the technical spirit of the present invention is not limited by the description of the pulley, and the scope of the present invention is granted to the related range inferred therefrom.

3 is a photograph of a typical automotive pulley.

As shown, when looking at the shape of the pulley, the size of the pulley can be seen that there are four types of outer diameter of 60 φ ~ 90 φ, a slight bend in the upper portion. In general, the pulley outline standard has a standard tolerance of at least 20 μm to 350 μm, and inspects each quality based on these standard tolerances.

4 is a cross-sectional view of the profile shape of the upper cross section of the pulley.

In general, when inspecting the outer dimensions of the pulley, approximately 12 (outer diameter, inner diameter, piercing diameter, pulley height, pad height, lateral (flatness), radial (round upper roundness), outer diameter roundness, (lateral) crown, inner roundness)) , Outside diameter vertical, upper angle) should be precisely measured to a few um. As shown, the outer diameter, inner diameter, crown and pad height, etc. of the pulley have bends. In addition, the pad height, the pulley height, the upper angle, and the piercing diameter have the characteristics of having a bent portion or requiring a deep inside measurement.

Conventional pulley inspection methods can be broadly classified into two types.

1 is a view for explaining a inspection technique of a pulley using a conventional vision system.

This method captures the shape of the pulley 100 as an image while horizontally moving the focus 122 of the camera 120 of the vision system, and then sends the image data to the computer 110 to transmit the pulley ( It is a method for calculating dimensions such as inner diameter and outer diameter of 100). However, this method requires that the structural surface to be measured is in principle two-dimensional, and if the object is a three-dimensional shape, it must be exactly two-dimensionally matched upon vision measurement. Therefore, if there is curvature in the vertical direction in the three-dimensional shape, the captured image is matched to a two-dimensional plane that does not reflect the curvature, and thus there is a problem that precise measurement is impossible. That is, in the case of the pulley, the outer diameter, the inner diameter, the crown and the pad height of the pulley, etc. have a bent portion, so that a vision system cannot be used.

2 is a view for explaining a inspection technique of a pulley using a conventional contact displacement meter.

This method has a tip part which makes physical contact with the outer surface of the shape of an object, and measures it, moving, maintaining the contact of a constant pressure along an outer surface. Therefore, even if the surface of the structure to be measured is a three-dimensional structure is possible to measure. However, since it is measured by the change or displacement of the physical contact pressure of the contact tip while moving, there is a limitation that it is possible only when the change width of the three-dimensional shape is within a few mm, and the three-dimensional shape when the inside is deeply curved Measurement is not possible. In addition, in the case of an object having an appearance material that cannot withstand the pressure with the tip portion to make contact, such as an appearance such as a pudding or a head, for example, measurement cannot be performed in this manner. That is, in the case of the pulley, there is a problem that the contact displacement meter cannot measure the height of the pad, the height of the pulley, the upper angle, and the piercing diameter.

The conventional pulley inspection method has a limitation in measuring all 12 specifications of the pulley.

On the other hand, in the past, in order to inspect such a pulley standard, a roundness measuring device may be used. In this case, there is a problem that only a partial inspection including an outer diameter and an outer diameter roundness can be performed.

The present invention has been made to solve the above problems of the prior art, and in the measurement technique using a conventional vision system or the measurement technique using a contact displacement meter, all three-dimensional structure, for example, the complex shape of the pulley It is to provide a technology that can overcome the limitations that could not be measured.

In addition, it is to provide a technology capable of measuring the appearance of a high-precision, non-contact three-dimensional shape while excluding a vision system requiring two-dimensional analysis and excluding a displacement meter by contact.

In addition, the XYZ axis movement of the measurement object and the rotation of the position to enable the appearance measurement technology to enable the measurement without a square.

In addition, it is to provide a technique that can automatically measure all the outer dimensions, including the outer diameter roundness, the inner diameter roundness of a complex structure, for example pulley structure with a precision of several μm.

In order to achieve the above technical problem, the external standard automatic inspection device of the three-dimensional structure according to the present invention, the rotating means for seating and rotating the object; Stage means for moving the rotation means in the X, Y, and Z axis directions; An inner and outer diameter laser provided at a position where the side shape of the object seated on the rotating means can be observed from the side, and having a tilting stage capable of tilting the observation angle; And a profile laser having a manual stage capable of moving a horizontal position of the upper surface shape of the object seated on the rotating means from above.

EXAMPLE

Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the external standard automatic inspection device of the three-dimensional structure according to the present invention.

5 is a configuration diagram of an external standard automatic inspection device of a three-dimensional structure according to the present invention.

As shown, the inspection apparatus of the present invention is composed of a rotating means 230, stage means 220, inner and outer diameter laser 264, profile laser 274.

The rotation means 230 is a means for seating and rotating the object. Here, as shown, it is possible to use a motor, in particular a stepping motor, the axis of the motor is preferably provided with a cradle 240 for placing the object, the cradle 240, if necessary, the object A chuck 250 may be provided for fixing the chuck 250.

The stage means 220 is a means for linearly moving the rotation means in the X, Y, and Z axis directions. That is, what is called a XYZ stage, and especially, it may be comprised using a linear motor. By this stage means 220, the object is rotated by the rotation means 230, it is possible to move in a straight direction at the same time.

On the other hand, the inner and outer diameter laser 264 is a means for observing the side shape of the object seated on the rotating means. The position to be installed, unlike the profile laser 274, needs to be a position where the side observation is possible. Preferably, the object is provided at a position that can be observed from the upper side or the lower side. The inner and outer diameter lasers 264 include a tilting stage capable of tilting the observation angle. Thereby, the angle which observes an object can be easily changed on the basis of the tilting stage fixedly installed in the specific position.

The profile laser 274 is a means for observing the top shape of the object seated on the rotating means. The position to be installed needs to be a position that can be observed from above. The profile laser 274 is provided with a manual stage capable of moving its horizontal position in the X and Y axis directions parallel to the ground. Thereby, the position where an object is observed can be easily changed manually based on the manual stage fixedly installed in the specific position.

As described above, the inspection apparatus of the present invention uses three lasers to inspect a standard of a complex three-dimensional object, for example, a pulley.

The inner and outer diameter laser 264 on the side is a laser capable of scanning the side shape of the pulley. Here, two inner and outer diameter lasers 264 may be provided to simultaneously measure the inner diameter and the outer diameter, or the respective diameters and roundness.

The outer diameter roundness and the inner diameter roundness are measured using the inner and outer diameter laser 264 on the side, but the laser point position shown in FIG. 5 shows the state of measuring the inner diameter and the inner diameter roundness.

(1) When measuring the inner diameter roundness, the rotating means 230, for example, the stepping motor, may be rotated at the current laser position shown in FIG.

(2) In order to measure the outer diameter roundness, the stage means 220, for example, the Z axis of the XYZ stage, is moved so that the laser point is located at the center of the outer diameter of the pulley. When the laser point indicates the outer diameter of the pulley, the rotation means 230, for example, driving the stepping motor to measure the outer diameter roundness.

(3) Radial measurement is performed by moving the stage means 220, for example, the Z axis of the XYZ stage, positioning the laser point on the top of the pulley outer diameter, and then rotating the means 230, for example, the stepping motor. Measure by rotating.

(4) Piercing mirror, (5) Pulley height, (6) Pad height, (7) To measure the top angle, move the stage means 220, for example the Y axis of the XYZ stage, to move the profile laser at the top Using 274, the center cross-sectional profile of the pulley is measured as shown in the right figure of FIG. The piercing mirror, the pulley height, the pad height, and the upper angle are calculated by computer calculation.

(8) The side crown calculates the crown with the difference value by moving the Z axis of the stage means 220, for example, by measuring the center point and the top of the side surface of the pulley using the inner and outer diameter lasers 264 on the side surface. .

(9) The outer diameter perpendicular is determined by moving the Z axis of the stage means 220, for example, by measuring the upper and lower sides of the pulley side using the inner and outer diameter lasers 264 on the side, and calculating the outer diameter vertical with the difference value. do.

(10) Lateral (flatness) measurement moves the Y axis of the stage means 220, for example, so that the laser point of the upper profile laser 274 is located at the upper peak of the pulley. Thereafter, the rotating means 230, for example, the stepping motor is rotated to measure the lateral (flatness) of the upper part of the pulley.

Hereinafter, more specifically, the pulley inspection method using the apparatus of the present invention will be described.

First, in order to measure the quality of the pulley, the pulley is mounted on a holder 240, for example, a measurement test plate, and then the chuck 250 is bitten and fixed as necessary. Then, the outer dimensions of the pulleys are measured.

The inspection procedure for the external inspection of the pulley can be illustrated as follows.

1) The eccentricity of the pulley is automatically measured and set using the stage means 220.

2) Measure the center cross-sectional profile of the pulley (see the right figure in Figure 4).

3) Measure the side profile of the pulley.

4) From the measured data, the pulley height, pad height, piercing diameter, and upper angle are automatically calculated.

5) Rotating means 230, for example, to rotate the motor primary. Measure lateral.

6) Adjust the stage means 220 on the Y-axis to adjust the inner diameter measuring position. Measure the inner diameter.

7) The second rotating means 230 is rotated. Inner diameter roundness is measured.

8) Adjust the stage means 220 on the Y axis to the upper peak measurement position.

9) Rotating means 230 is rotated three times. Measure lateral.

10) Adjust the stage means 220 in the Z-axis to the outer diameter laser measurement position. Measure the outer diameter.

11) rotate the rotation means 230 four times. Measure the outer diameter roundness.

12) Using the Z axis movement of the stage means 220, the Z axis profile of the pulley outer diameter is measured. Crown, outer diameter perpendicularity is measured.

Although the present invention has been described above by way of one embodiment, the present invention is not limited to the above-described embodiments and drawings, and various substitutions and changes can be made without departing from the spirit of the present invention. It will be apparent to those of ordinary skill in the art.

According to the present invention having the above-described configuration, in the measurement technique using a conventional vision system or a measurement technique using a contact displacement meter, the limitation that all complex shapes of a three-dimensional structure, for example a pulley, could not be measured was overcome. The technology to do this is provided.

In addition, a technology capable of measuring the appearance of a high precision non-contact three-dimensional shape while providing a vision system requiring two-dimensional analysis and excluding a displacement meter by contact is provided.

In addition, an outline measurement technique is provided that enables movement of the XYZ axis of the measurement object and rotation in place, thereby enabling measurement without a blind spot.

In addition, a technique is provided that can automatically measure all external dimensions, including outer diameter roundness and inner diameter roundness, of complex structures, such as pulley structures, with a precision of several micrometers.

Claims (1)

In the device for automatically checking the appearance of the three-dimensional structure, Rotating means for seating and rotating the object; Stage means for moving the rotation means in the X, Y, and Z axis directions; An inner and outer diameter laser provided at a position where the side shape of the object seated on the rotating means can be observed from the side, and having a tilting stage capable of tilting the observation angle; A profile laser provided at a position capable of observing an upper surface shape of the object seated on the rotating means from above and having a manual stage capable of moving the horizontal position thereof; Characterized in that comprises a, three-dimensional structure of the external standard automatic inspection device.

Images