KR101358282B1 - A contactlessly diagnosing device for analyzing formed shapes and cracks of sheet metal for test and a software for it - Google Patents

Abstract

This patent relates to diagnostic devices for forming and cracking specimens and software therefor. The apparatus of the present invention comprises: image input means for photographing a molded specimen during molding of a test specimen plate material (hereinafter referred to as a 'sample') and inputting shape image related data; And diagnostic software for shaping and crack analysis for receiving shape data related to the shape image input from the image input means from a computer system through an overlay board, I / O and A / D through a predetermined measuring means. In this case, by analyzing the shape of the specimen during molding, it is characterized in that the non-contact confirmation of the occurrence of cracks on the molding.

Description

A contactlessly diagnosing device for analyzing formed shapes and cracks of sheet metal for test and a software for it}

The present invention relates to a non-contact diagnostic device for forming and cracking analysis on a specimen and software therefor. In particular, the present invention relates to a diagnostic apparatus for forming and cracking analysis of non-contacting specimens.

The background art of this invention is Applicant's other patent 10-0976211 "The biaxial stress evaluation apparatus by a hydraulic expansion". However, this prior art is measured by contact using a plurality of sensors, there was a problem in that the shape and the height of the molding dome is formed in an analog manner when forming. ^. Therefore, it was necessary to develop a technology capable of analyzing and measuring shapes by capturing images using CCD cameras or similar devices. In particular, the use of non-contact method is highly accurate, and all the situation is displayed on the monitor during molding, and it is urgently needed to develop a precise and accurate device driving and measuring technology that can analyze and randomly set the stop of the crack.

In addition, the method of deforming (molding) the specimen into various forms using a molding machine is classified into a shearing method, a bending process, a drawing process, a tensile process, a compression process, and a joining process. In the case of special plastic processing, the shape and processing state of the specimen after the conventional molding were analyzed by various measuring equipment. However, in the related art, a technique for analyzing an image with a high technology is required, and a technique for analyzing a shape of a specimen molding during molding is also required. ^.

It is related to Applicant's Patent No. 10-0976211 "Isoaxial Stress Evaluation Apparatus According to Hydraulic Expansion". However, this patent is a contact method, which is a technology that is not technically advanced compared to the present invention.

It is an object of the present invention to provide a non-contact molded shape analysis and crack detection device and software therefor that can solve the problems of the prior art described above.

Other objects and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings.

The configuration of a preferred embodiment of the shape analysis and crack detection device according to the present invention,
The apparatus comprises:
Image input means for photographing the molded specimen during molding of a test specimen sheet material (hereinafter referred to as a “sample”) to input shape image related data; And
Diagnostic software for shaping and crack analysis for receiving shape data related to the shape image input by the image input means from a computer system through one of an overlay board, I / O and A / D through a predetermined measuring means;
Made with

At this time, by analyzing the shape of the specimen during molding, characterized in that the non-contact confirmation of the occurrence of cracks on the molding.

In this embodiment, the measuring means is preferably an image analyzer or a strain analyzer.

In this embodiment, the video input means is preferably a CD camera.

In this embodiment, the measuring means is preferably an optical measuring system.

In this embodiment, the shape image data preferably includes strain on the specimen, the amount of change in the specimen and the forming limit diagram data.

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In this embodiment, in order to accurately detect the crack shape analysis and cracks for a large molded specimen or a complex specimen, the dot information on the surface of the specimen in three or more directions is recorded, the coordinate information of these points is determined, and the strain It is desirable to determine the distribution.

In this embodiment, it is preferable to compare the limit curve with the cracks of the allowed specimen to determine whether the molding is defective and to analyze the molding of the specimen.

In this embodiment, each point is preferably set by an electrochemical etching, laser etching or printing technique before molding at regular intervals in the range of 1 to 5 mm.

In this embodiment, a random point on the limit curve is designated to diagnose cracks for the corresponding part, and three prediction values are obtained at each point, and the experimental results are obtained to average the expected and actual values. It is preferable to control the formability tester 60 based on this average value by calculating a value.

A preferred embodiment of the diagnostic software for molding analysis and crack analysis for the diagnostic device for shaping and crack analysis of the specimen of claim 1,
Receiving all data of the molded specimen from the image input unit and transmitting the received data to the computer system;
The computer system uses the data of the received molded specimen to measure major strain, minor strain, and molding variation of the specimen;
When the computer system issues a control command to the main controller based on the measurement result, the main controller controls a molding tester which is operated by the hydraulic power unit according to the command to form a new test specimen;
Providing a hydraulic pressure for operation of the molding tester by the divergence manifold and the servovalve;
Measuring the amount of change in shaping of the specimen between the center of the specimen before molding and the central cross section of the specimen after molding; And
And determining whether strain is generated based on the measurement result and the limit curve.

In this embodiment, the diagnostic software of the predetermined molding analysis and crack analysis,
Preferably, the method further comprises performing process optimization for the major strain, minor strain, and the amount of change in molding of the specimen.
In this embodiment, an arbitrary point P1 around the inflection point on the limit curve obtained by forming simulation on the specimen is designated to diagnose the portion of the specimen corresponding to this point as a possible generation of crack, Molding experiments are carried out under the same conditions as in the simulation in turn, and the molding machine is controlled to stop molding at a predetermined point P1 'around the inflection point on the limit curve corresponding to the crack-prone portion, and on the limit curve at each experiment. Select three or more arbitrary points P2 in the region of the molding corresponding to any designated point P1 'around the inflection point to obtain the area of the area surrounded by these arbitrary points P2 It is preferable to use a value obtained by averaging these molding area values S1 as the molding area value S1 for controlling the molding machine.

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According to the implementation of this patent, even in the case of special plastic processing, unlike the conventional method, the shape and processing state of the specimen after molding can be analyzed by high technology, and in particular, the shape of the specimen molding can be analyzed by non-contact method during molding. . ^.

This patent uses a CD camera or similar device to analyze and measure the shape of the specimen after molding, so it is highly accurate and non-contact. Can be set and stopped arbitrarily to enable accurate and accurate device operation and measurement.

In addition, the patent uses a non-contact CCD camera instead of a contact sensor, there is no slip phenomenon, there is no movement of the precision sensor and the configuration is relatively simple.

This patent can maximize the molding efficiency because it controls the molding machine based on the molding area value obtained through simulation and based on the value obtained by averaging the results obtained from a number of actual experiments.

As such, the patent can be widely used in the automotive, extension, steel, aluminum and stainless steel industries.

1 is a preferred embodiment of a non-contact forming shape analysis and crack detection device configuration according to the present invention.

The general molding processing techniques are classified as follows.

1. Shearing: Cutting, cutting, dividing, punching, piercing, cutting, cutting, half punching, trimming, shaving, slitting, finishing and precision punching.

2. Bend processing: V bending, U bending, L bending, Z bending, compound bending, double acting bending, round bending, cam type bending, press brake bending, roll bending and hemming.

3. Drying: Cylindrical drilling, angular drilling, conical drilling, re-drying, reverse drilling, necking, double-large drilling.

4. Composite tensile molding processing: Hemispherical drying, mold extraction, tensile press processing, baling, pulling, beading, burring, currying and embossing.

5. Compression: Cold extrusion, impact extrusion, heading, stamping, sizing, swaging, cold forging, etching and ironing.

6. Joining process: There are molding joint processing and molding joint processing.

7. Special plastic processing: hydrofoam, high speed hammer, explosive molding, liquid discharge molding, and electronic molding rotational molding.

The preferred embodiment of the present invention has a structure as shown in FIG. 1, and is output by using a measuring device similar to a shape image analyzer or a strain analyzer taken by a CD camera when forming a specimen. "Multi-channel digital feedback control device" disclosed by Applicant Patent No. 10-0697587 of Applicant's Patent No. 10-0697587 by writing the necessary software by receiving data from the main PC through the overlay board or I / O, A / D, etc. Drive to stop automatically according to the crack size during shape analysis and cracking during molding.

As a driving device, Applicant's prior patent No. 10-0976211 "Equilibrium stress evaluation device according to hydraulic expansion", Other prior patent No. 10-1070765 "Cryogenic and high temperature formability tester", Another prior patent No. 10 Preference is given to the use of "hot formability testers" or similar equipment.

Referring now to Figure 1 will be described in detail the configuration of this invention. The configuration of a preferred embodiment of the shape analysis and crack detection device according to the present invention,

When the specimen 50 is formed, the overlay board, I / O and A / D (not shown. And a predetermined analysis and diagnostic software (not shown, embedded in the computer system) is received from the computer system 10 to analyze the shape of the specimen being molded to determine whether cracks are formed on the molded product. Characterized in that the contactless confirmation.

In this invention, the measuring means 20 is preferably an image analyzer (strain analyzer) or strain analyzer (strain analyzer). And the image input means 30 is preferably a CD camera. In addition, the measuring means 20 is preferably an optical measuring system (optical measuring system).

In the present invention, the shape image related data includes the strain on the specimen, the variation amount of the specimen and the forming limit diagram data.

On the other hand, the diagnostic method of the predetermined molding analysis and crack analysis,

Receiving all data of a test specimen sheet metal formed from an image input unit and transmitting the received data to a computer system (S10);

The computer system measures the change amount of the major strain, the minor strain and the test piece by using the data of the molded test piece received above (S20);

Based on the above measurement results, when the computer system issues a control command to the main controller, the main controller controls the formability tester 60 which is operated by the hydraulic power unit 70 according to the command to form a new test specimen. Step S30;

The divergence manifold and the servovalve 80 providing hydraulic pressure for the operation of the molding tester under the control of the main controller (S40);

Measuring a molding change amount of the specimen in the center of the specimen before molding and in the center cross section of the specimen after molding (S50); And

It is preferable to include the step (S60) of determining the occurrence of the strain based on the above measurement results and the limit curve. Here, the limit curve is a curve obtained by molding simulation on the specimen.

And the diagnostic method of the predetermined molding analysis and crack analysis,

Preferably, the method further comprises a step (S70) of performing process optimization for the amount of change in the shape of the major strain, the minor strain and the specimen.

In particular, in this invention, in order to accurately detect the shape analysis and cracks of a large molded specimen or a complex specimen, the dot information on the surface of the specimen in three directions or more is recorded, the coordinate information of these points is determined, and the strain It is characterized by determining the distribution. At this time, the upper limit curve and the crack of the allowed specimen are compared to determine whether the molding is defective. Each point above is also set by electrochemical etching, laser etching or printing techniques before molding at regular intervals in the range of 1 to 5 mm.

Further, in this invention, an arbitrary point P1 around the inflection point on the limit curve obtained by forming simulation on the specimen is designated to diagnose the portion of the specimen corresponding to this point as a possible occurrence of crack, Molding experiments are performed under the same conditions as in the simulation in turn, and the molding machine is controlled to stop molding at a predetermined point P1 'around the inflection point on the limit curve corresponding to the crack-prone portion, and on the limit curve at each experiment. Select three or more arbitrary points P2 in the region of the molding corresponding to any designated point P1 'around the inflection point to obtain the area of the area surrounded by these arbitrary points P2 Is a molding area value S1, and the average of these molding area values S1 is used for controlling the molding machine.

As such, the present invention may be variously modified and may take various forms, and only the specific embodiments thereof are described in the detailed description of the present invention. It is to be understood, however, that this invention is not limited to the particular forms set forth in the foregoing description, but rather includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

The technique of this invention can be applied to a measuring system. For example, it is applicable to stereo-camera setup and deep drawing machine. And most of all, the present invention can be applied to checking the crack generation of the molding through the analysis of the molding image.

10: computer system 20: measuring means
30: video input means 40: main controller
50: Specimen 60: Formability Tester
70: hydraulic power unit 80: divergence manifold and servovalve

Claims (14)

In the diagnostic device of shaping and crack analysis of specimens,
The apparatus comprises:
Image input means for photographing the molded specimen during molding of a test specimen sheet material (hereinafter referred to as a “sample”) to input shape image related data; And
Diagnostic software for shaping and crack analysis for receiving shape data related to the shape image input by the image input means from a computer system through one of an overlay board, I / O and A / D through a predetermined measuring means;
Made with
At this time, by analyzing the shape of the specimen during molding to determine the occurrence of cracks on the molding, characterized in that non-contact, diagnostic apparatus for forming and crack analysis of the specimen. The apparatus of claim 1, wherein the measuring means is an image analyzer or a strain analyzer. The apparatus of claim 1, wherein the image input unit is a CD camera. The apparatus of claim 1, wherein the measuring means is an optical measuring system. The apparatus of claim 1, wherein the shape image-related data includes strain on a specimen, a variation amount of the specimen, and a forming limit diagram data. delete delete The method of claim 1, in order to accurately detect the shape analysis and cracks of a large molded specimen or a complex specimen, record dot information on three or more directions of the specimen surface, determine coordinate information of these points, and strain A device for diagnosing shaping and cracking of specimens, characterized in that the distribution is determined. The apparatus of claim 1, wherein the limit curve obtained by the forming simulation on the specimen is compared with the allowable crack of the specimen to determine whether the amount of change in the molding is changed. 9. The apparatus of claim 8, wherein each point is set by electrochemical etching, laser etching or printing techniques prior to molding at regular intervals in the range of 1 to 5 mm. delete In the diagnostic software of the molding analysis and crack analysis for the diagnostic device of the shaping and crack analysis of the specimen of claim 1,
The software,
Receiving all data of the molded specimen from the image input unit and transmitting the received data to the computer system;
The computer system uses the data of the received molded specimen to measure major strain, minor strain, and molding variation of the specimen;
When the computer system issues a control command to the main controller based on the measurement result, the main controller controls a molding tester which is operated by the hydraulic power unit according to the command to form a new test specimen;
Providing a hydraulic pressure for operation of the molding tester by the divergence manifold and the servovalve;
Measuring the amount of change in shaping of the specimen between the center of the specimen before molding and the central cross section of the specimen after molding; And
And determining whether strain has been generated based on the measurement result and the limit curve obtained by molding simulation on the specimen. software. The diagnostic software of claim 12, wherein the predetermined molding analysis and crack analysis diagnostic software comprises:
And performing process optimization for the molding strain of the major strain, the minor strain, and the test piece, the mold analysis and crack analysis diagnostic software for the test device for forming and cracking the test piece. The method of claim 12, by designating an arbitrary point (P1) around the inflection point on the limit curve obtained by forming simulation on the specimen and diagnosing the portion of the specimen corresponding to this point as a possible generation of cracks, Molding experiments are carried out under the same conditions as in the simulation in turn, and the molding machine is controlled to stop molding at a predetermined point P1 'around the inflection point on the limit curve corresponding to the crack-prone portion, and on the limit curve at each experiment. Select three or more arbitrary points P2 in the region of the molding corresponding to any designated point P1 'around the inflection point to obtain the area of the area surrounded by these arbitrary points P2 Shaping and cracking of the test piece, characterized by using the average value of the molding area values S1 as the molding area value S1 for controlling the molding machine. Diagnostic software for shaping and crack analysis for diagnostic devices of analysis.

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