KR19990049263A - 3D object inspection device and its inspection method - Google Patents

Abstract

The present invention relates to a three-dimensional object inspection apparatus and its inspection method, comprising: a holder (5) for fixing a three-dimensional object (1); A holder driver (7) coupled to the holder (5) and a predetermined shaft (3) to set the inspection position of the object by rotating the holder (5) during driving; A light source 10 disposed opposite to one surface of the object 1 to provide predetermined light to the object 1; installed at a predetermined position symmetrical with the light source 10 based on the object 1 At least one image recognizing unit (12, 14, 16) for recognizing a video image of a predetermined position of the object by using the light of the light source (10); A data processing unit 40 for converting the video image detected and provided from the image recognition units 12, 14, and 16 into digital data; A database (DB) unit 60 for storing a database of reference data for the object 1 in advance; When the holder 5 is driven to cause the holder 5 to fix the object 1, the holder driver 7 is driven, and when digital image data for the object 1 is provided from the data processor 40, the DB is provided. A controller (50) which detects, stores and outputs an error with respect to the inspection position of the object (1) by reading reference data of the object (1) from the unit (60) and comparing it with the digital image data; It is configured to include a monitor 70 for displaying the error when the error is provided for the inspection position of the object from the controller 50.

Description

3D object inspection device and its inspection method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an object inspection apparatus, and more particularly, to a three-dimensional object inspection apparatus and an inspection method thereof, which accurately and quickly detect dimensions and surface defects of a three-dimensional object such as a rigid body and the like to distinguish defective and good products.

In general, a single part such as a rigid body used for a mechanical part or the like detects its dimensions, surface defects, and the like by using a predetermined inspection device to determine whether or not a defect is produced when finished.

As a method for inspecting the dimensions and surface defects of such rigid bodies, a contact method using a one-dimensional sensor, that is, a non-contact method using a laser, a touch probe sensor, or the like has been widely used.

However, the conventional inspection apparatus as described above has the following problems. In other words, the method using a contact probe sensor can easily and easily measure the dimensions and defects of the inspection object, but the measurement time is long, the measurement accuracy is inferior, and the force can be directly applied to the measurement object. There is a problem that there is a risk of damage, and there is no risk of deformation and damage of the object using a non-contact laser sensor, but this also takes a long time and difficult to attach a laser sensor for measurement in the measurement position.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems described above, and an object of the present invention is to accurately detect dimensions and surface defects of a three-dimensional object by using a non-contact two-dimensional sensor, and to determine good and defective products. The present invention provides a three-dimensional object inspection apparatus and its inspection method.

According to a preferred embodiment of the present invention for achieving the above object, in the three-dimensional object inspection apparatus for detecting the state of the object by measuring the dimension and surface defects for a predetermined three-dimensional object, the three-dimensional object A holder coupled to the holder, the holder driving part configured to set the inspection position of the object by rotating the holder during driving, and installed to face one surface of the object so as to be provided with a predetermined light. A light source providing a light source, at least one image recognition unit installed at a predetermined position symmetrical with the light source with respect to the object, and recognizing an image image of a predetermined position of the object using light of the light source; A data processing unit for converting a video image detected and provided from the recognition unit into digital data; A database (DB) unit for storing a reference data and a tolerance in advance and storing the object; driving the holder to fix the object, driving the holder drive unit, and driving the object from the data processing unit to the object. A control unit which detects, stores and outputs an error of an inspection position of the object by reading reference data of the object from the DB unit and comparing the digital image data with the digital image data when the digital image data is provided. It includes a monitor to display the error provided for the inspection position of the object.

According to another preferred embodiment of the present invention for achieving this object, a holder for fixing a predetermined three-dimensional object, a holder driver for rotating the holder, and an image image of a predetermined position of the object fixed to the holder An inspection method in a three-dimensional object inspection apparatus including at least one image recognition unit for recognizing and a database (DB) for storing the reference data for the object to measure the dimensions and surface defects for the inspection object (A) driving the holder to fix the object to the holder, rotating the holder to set the inspection position of the object, and (b) receiving a video image signal for the inspection position of the object. Detecting and converting the detected video image signal into digital data; and (c) pre-selecting the object from the DB unit. Detecting the error of the object by reading the data and comparing it with the digital data of the video image, and determining whether the detected error is smaller than the allowable value; and (d) the error is greater than the allowable value in the step (c). If greater than or equal to, detecting a crack or the like with respect to the inspection position, storing and displaying the error value and the error occurrence position, and (e) the error is less than or equal to the allowable value in the step (c). When the step is completed, it is determined whether the inspection of all positions of the object is completed. If the inspection is not completed, the process returns to step (a) to rotate the holder to set another inspection position, and the inspection is performed. When complete, turning off the holder to separate the object from the holder.

1 is a block diagram showing a three-dimensional object inspection apparatus according to an embodiment of the present invention,

Figure 2 is a detailed flowchart showing a three-dimensional object inspection method according to another embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

1: specimen 5: holder

7: holder driving unit 10: light source

12, 14, 16: image recognition unit 18, 20, 22: fixed unit

24: support 30: height adjustment

40: data processing unit 50: control unit

60: DB unit 70: monitor

100: frame

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a three-dimensional object inspection apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, the three-dimensional object inspection apparatus according to the present invention includes a holder 5, a holder driving unit 7, a light source 10, at least one image recognition unit 12, 14, 16, and a fixing unit ( 18, 20, 22, support 24, height adjustment 30, data processing unit 40, the control unit 50, database (DB) 60, monitor 70 It is composed. In addition, the holder 5, the holder driving unit 7, the light source 10, the image recognition unit 12, 14, 16, the fixing unit 18, 20, 22, the support unit 24, the height adjustment unit 30 Is fixed to the frame 100 is installed.

The holder 5 is made of a magnetic fixing device because the object 1 to be inspected according to the present invention is a rigid body, and is driven under the control of the controller 50 to fix the predetermined 3D object 1 to be inspected. do. In addition, the holder driving unit 7 is coupled to the holder 5 through the shaft 3, and driven under the control of the controller 50 to rotate the holder 5 and the object 1 so as to rotate the three-dimensional object 1. Set the inspection position of), which can be configured as an AC motor.

In addition, the light source 10 is installed to face one surface of the object 1, that is, the opposite surface of the inspection position, to provide predetermined light to the object 1. The image recognizing units 12, 14, and 16 are composed of CCD cameras 12, 14, and 16 using at least one charge coupled device (CCD), and the image recognition units 12, 14, and 16 are positioned at a predetermined position symmetrical with the light source with respect to the object 1. It is fixedly installed through the governments 18, 20, 22, and recognizes the image image by capturing the image of the predetermined position of the object 1, that is, the inspection position using the light of the light source 10, and recognizes the image signal. To the data processor 40. In addition, the light source 10 is installed on the opposite side of the CCD camera (12, 14, 16) in order to reduce noise in the image recognition process through the CCD camera (12, 14, 16), and back light (back lighting) technique Radiate.

On the other hand, the fixing part (18, 20, 22) for fixing the CCD camera 12, 14, 16 is coupled to the support 24, the support 24 in accordance with the drive of the height adjuster 30 up and down the axis To determine the height of the CCD cameras 12, 14 and 16. In addition, the height adjustment unit 30 is driven according to the control of the controller 50 in consideration of what the object to be inspected.

On the other hand, the data processor 40 receives an image image signal captured by the image recognition unit 12, 14, 16, that is, a CCD camera, converts the image into binary digital data, and provides it to the controller 50.

The DB unit 60 stores the reference data and the allowable error value for the three-dimensional object 1 to be examined in a database in advance.

Meanwhile, according to the present invention, the controller 50 drives the holder 5 so that the holder 5 fixes the object 1 and drives the holder drive 7 to check the inspection position of the object 1. In addition, if the digital image data for the object 1 is provided from the data processing unit 40, by reading and reading the reference data for the object 10 from the DB unit 60 and comparing it with the digital image data. An error with a reference value is detected with respect to the inspection position of the object 1 and stored and outputted to the monitor 70.

That is, the controller 50 compares the image signal of the object 1 recognized by the image recognition unit 12, 14, 16 and the reference data of the object 1 stored in the DB unit 60 to detect the error. When the detected error is within the tolerance range, that is, when the detected error is smaller than the tolerance, the inspection position of the object 1 is set to another position by driving the holder drive unit 7 by detecting that the position is normal. When the error exceeds the tolerance range, it recognizes that the position is bad, stores the bad position and error value, and simultaneously outputs and displays the monitor 70 so that the user recognizes it.

2 is a detailed flowchart illustrating a three-dimensional object inspection method according to another embodiment of the present invention.

In step S10, the controller 50 turns on the holder 5, that is, drives the holder 5 to fix the object 1 to the holder 5, and in step S20, the holder driving unit 7. By driving, the holder 5 is rotated to set the inspection position of the object 1.

Thereafter, in step S30, the image recognition unit 12, 14, 16 of the object 1, i.e., the video image signal for the inspection position set through the CCD camera is detected, and in step S40, the detected video image Convert the signal to binary digital data.

In operation S50, the controller 50 reads and reads reference data about an object previously stored from the DB unit 60, and in operation S60, the digital data for the image image converted in operation S40 may be read. By comparing the reference data read in step S50, an error with respect to the object 1 is detected and the process proceeds to step 9S70.

Then, in step S70, the controller 50 determines whether the detected error is smaller than the allowable value, that is, whether the detected error is within the tolerance range. In this case, if the detected error is within the tolerance range, If the detected error is larger than the allowable value, that is, the detected error is not within the tolerance range, the process proceeds to step S80.

When the process proceeds from step S70 to step S80, in step S80, the controller 50 determines the inspection position of the object 1 as a defective position, detects a crack at the defective position, and the like. By storing the position and the error value and displaying it through one monitor 70, the user recognizes the defective state. When step S80 is completed, the process proceeds to step S90.

Meanwhile, when the process proceeds from the step S70 or the step S80 to the step S90, in step S90, the controller 50 determines whether the inspection against all the positions of the object 1 is completed, in step S90. If the inspection is not completed, the process returns to step S20 to perform the flow again. If the inspection is completed, the process proceeds to step S100.

Finally, when the process proceeds from step S90 to step S100, in step S100, the controller 50 turns off the driving of the holder 5 to separate the object 1 from the holder 5 to release the inspection object. And end the flow.

As described above, the present invention uses the image data through the CCD camera in the inspection of a three-dimensional object, that is, a rigid body to determine the state of the inspection object by measuring the inspection object more quickly and smoothly. There is an effect that can inform the user.

Claims (8)

In the three-dimensional object inspection apparatus for detecting the state of the object by measuring the dimensions and surface defects with respect to a predetermined three-dimensional object (1), A holder (5) for fixing the three-dimensional object (1); A holder driver (7) coupled to the holder (5) with a predetermined shaft (3) to set the inspection position of the object by rotating the holder (5) during driving; A light source 10 disposed opposite to one surface of the object 1 to provide predetermined light to the object 1; At least one image recognizing unit installed at a predetermined position symmetrical with the light source 10 based on the object 1 to recognize an image image of the predetermined position of the object using the light of the light source 10 ( 12, 14, 16); A data processor (40) for converting the video image detected and provided from the image recognition unit (12, 14, 16) into digital data; A database (DB) unit 60 for storing the reference data and the tolerance of the object 1 in advance and storing them in a database; The holder 5 is driven to cause the holder 5 to fix the object 1, to drive the holder driver 7, and a digital image of the object 1 from the data processor 40. When the data is provided, the control unit detects, stores and outputs an error of the inspection position of the object 1 by reading the reference data of the object 1 from the DB unit 60 and comparing the reference data with the digital image data. 50; 3. The apparatus of claim 3, further comprising a monitor configured to display an error of the inspection position of the object from the control unit. The method of claim 1, wherein the apparatus, The same number of fixing parts (18, 20, 22) as the image recognition parts (12, 14, 16) fixing the image recognition parts (12, 14, 16); A support (24) coupled to the fixing parts (18, 20, 22) to support the fixing parts (18, 20, 22); Driven under the control of the controller 50, the height of the image recognition unit 12, 14, 16 is adjusted by transferring the fixing units 18, 20, 22 upward or downward through the support 24. Three-dimensional object inspection device further comprising a height adjustment. 3. The holder according to claim 2, wherein the holder (5), holder driver (7), light source (10), image recognition parts (12, 14, 16), fixing parts (18, 20, 22), support part (24), height Adjuster 30 is a three-dimensional object inspection device, characterized in that fixed to the predetermined frame (100). 4. The three-dimensional object inspection device according to claim 3, wherein the holder (5) is made of a magnetic fixing device. The apparatus of claim 4, wherein the image recognition unit (12, 14, 16) comprises a CCD camera using a charge coupled device (CCD). The method of claim 5, wherein the light source 10 is installed on the opposite side of the CCD camera (12, 14, 16) is characterized in that using a back lighting (back lighting) technique for emitting light toward the object (1) 3D object inspection device. The method of claim 6, wherein the controller 50 drives the holder driving unit 7 when the detected error is within an allowable error range, so that inspection of another position is performed, and the detected error is an allowable error range. And if not within the inspection position and the detected error output to the monitor for display. Recognizes a holder 5 for fixing a predetermined three-dimensional object 1, a holder driver 7 for rotating the holder 5, and an image image of a predetermined position of an object fixed to the holder 5 At least one image recognition unit 12, 14, and 16, and a database (DB) unit 60 for storing reference data for the object 1, and having dimensions and surfaces for the inspection object. In the inspection method in the three-dimensional object inspection device for measuring a defect, (A) driving the holder (5) to fix the object (1) to the holder (5), and rotating the holder (5) to set the inspection position of the object; (B) detecting a video image signal corresponding to an inspection position of the object (1) and converting the detected video image signal into digital data; (C) detecting the error of the object by comparing the reference data of the object from the DB unit 60 with the digital data of the video image, and determining whether the detected error is smaller than an allowable value; ; (D) detecting a crack or the like with respect to the inspection position if the error is greater than or equal to the allowable value in step (c), and storing and displaying the error value and the error occurrence position; (E) In step (c), if the error is smaller than the allowable value or the step (d) is completed, it is determined whether the inspection of all positions of the object is completed. And returning to step) to set the other inspection position by rotating the holder, and when the inspection is completed, turning off the holder to separate the object from the holder.