KR101477398B1 - Method for predicting defect of materials - Google Patents

Abstract

The present invention provides a method for predicting defects of a component which comprises: a first step of setting a final forming area constituting a function unit included in a final component; a second step for setting a middle forming area where a raw material is prepared, and the final forming area is formed on the raw material; and a third step for predicting inside defects of the final component by determining whether the inside defects are generated in the middle forming area.

Description

METHOD FOR PREDICTING DEFECT OF MATERIALS [0002]

The present invention relates to a component defect prediction method, and more particularly, to a component defect prediction method for predicting a defect position before being formed into a final finished product.

In general, shaft components such as crankshafts are components that are subjected to high loads within the installed apparatus, and occurrence of defects such as cracks should be minimized.

It is important to predict before the final part is formed if large impurities in the molten steel are present in the shaft component during casting.

Prior art relating to the present invention is disclosed in Korean Patent Laid-Open Publication No. 10-2012-0110537 (published 10th, 2012, 10th, 2012), which describes a description of a method for selecting an internal defect evaluation index.

It is an object of the present invention to provide a component defect prediction method for predicting a defect position before being molded into a final finished product.

In a preferred embodiment, the present invention comprises a first step of setting a final forming area constituting a functional part included in a final part; A second step of preparing a raw material and setting an intermediate forming region for forming the final forming region in the raw material; And a third step of determining whether or not an internal defect has occurred in the intermediate forming region and predicting an internal defect in the final part.

In the first step, it is preferable to set the final forming region for each of the functional units, respectively, when the functional units are plural.

In the second step, it is preferable to set a plurality of the intermediate forming regions so as to correspond to each of the final forming regions.

In the second step, it is preferable to proceed with a plurality of unit forming processes so as to sequentially form the raw materials to be prepared in different shapes, and to set the intermediate forming regions in each of the unit forming processes differently.

The third step may include preparing an ultrasonic inspection apparatus, performing ultrasonic inspection of the raw material in each of the unit forming processes using the ultrasonic inspection apparatus, and performing the ultrasonic inspection results of the unit forming processes It is preferable to judge whether or not an internal defect is included in the intermediate molding regions for the raw material in the final molding regions and to predict whether or not the internal defect is generated in each of the final molding regions according to the determination result.

Wherein the ultrasonic inspection is performed at a plurality of positions spaced with respect to the raw material, calculating a frequency of occurrence of the internal defect at each position, and when the frequency of occurrence reaches a predetermined reference frequency, It is determined that the internal defects are generated in each of the final formed areas.

It is preferable that a molding deformation amount in which the intermediate forming regions for the raw material in each of the unit forming processes constitute the final formed regions is set.

The position of the internal defect generated in the intermediate forming regions with respect to the raw material in each of the unit forming processes is checked and the positions of the internal defects are compared with each other in the final forming regions .

The present invention has the effect of predicting a defect position before being molded into a finished product.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart illustrating a method for predicting a component defect of the present invention. FIG.
2 is a view showing a process of forming a final part through a plurality of unit forming processes.
FIG. 3 is a diagram showing a result of internal defect position determination for each functional part of a final part determined by the method for predicting a part defect according to the present invention.

Hereinafter, a component defect prediction method of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows a method of predicting a part defect according to the present invention, FIG. 2 shows a process of forming a final part through a plurality of unit forming processes, FIG. 3 shows a final part And the internal defect position determination result for each functional part of FIG.

Step 1

1 (hereinafter, the number of the constituent elements will be referred to Fig. 2 and Fig. 3), a final forming area FA constituting a functional part included in the final part 500 is set in a controller (not shown) .

The final part 500 may be a crankshaft shown in Fig. The crankshaft is connected to the different functions of the shaft 501, the pin 502, the journal 503, and the rear flange 504.

The final part 500 is molded through a number of unit forming processes.

The unit forming steps include preparing a raw material 10, molding the raw material 10 into a round bar 20, shaping the round bar 20 into a booster 30 before molding the final part, (30) is formed into a finished part (500) and completed.

Thus, the final formed area FA of each functional part can be formed in the final part 500. [

The genital final shaping area FA includes a first final shaping area FA1 forming the shaft 501 as shown in Fig. 3, a second final shaping area FA2 forming the fins 502, A third final forming area FA3 forming the rear flange 503 and a fourth final forming area FA4 forming the rear flange 504. [

It is a matter of course that the final forming area FA is determined by different functional parts depending on the type of the final part 500. [

As described above, the final formed area FA for the final part 500 can be stored and set as area data in a separate controller.

Step 2

After the final forming area FA is set for each functional part of the final part 500 as described above, the raw material 10 for forming the final part 500 is prepared.

In the raw material 10, intermediate forming regions RA corresponding to the final forming regions FA in which the functional portions are formed as described above are set.

That is, when the final part 500 is formed through a plurality of unit forming processes, the intermediate forming areas RA are areas forming the final forming area FA of the functional parts.

3, in the unit forming process for preparing the raw material 10, the intermediate forming region BA is divided into a first intermediate forming region BA1 constituting the shaft 100 and a second intermediate forming region BA1 constituting the pin 200 A second intermediate forming region BA2 forming the journal 300 and a fourth intermediate forming region BA4 forming the rear flange 400. The first intermediate forming region BA2 may be formed of a first intermediate forming region BA2,

In the unit forming process of forming the round bar 20, the intermediate forming region RA is divided into a first intermediate forming region RA1 constituting the shaft 101 and a second intermediate forming region RA1 constituting the pin 201 A third intermediate forming region RA3 constituting the journal 301 and a fourth intermediate forming region RA4 constituting the rear flange 401. [

In the unit forming step in which the round bar 30 is formed, the intermediate forming region BUA includes a first intermediate forming region BUA1 constituting the shaft 102 and a second intermediate forming region A third intermediate forming region BUA3 constituting the journal 302 and a fourth intermediate forming region BUA4 constituting the rear flange 402. [

The final forming area in the final forming step is a first final forming area FA1 constituting the shaft 501, a second intermediate forming area FA2 constituting the fin 502, The third intermediate forming region FA3 and the fourth intermediate forming region FA4 constituting the rear flange 504. [

Each of the final forming area FA and the intermediate forming areas BA, RA, and BUA may be set in the control unit (not shown) as area data under the above conditions.

The raw material 10 is prepared (Bloom)

Intermediate forming regions BA, RA, and BUA in which a plurality of functional portions such as the shaft 100, the pin 200, the journal 300, and the rear flange 400 are formed are set in the raw material 10 .

Step 3

After preparing the raw material 10 on which the intermediate forming regions BA are formed as described above, an ultrasonic inspection apparatus is prepared.

Next, ultrasonic inspection is performed at a plurality of positions (hereinafter referred to as measurement positions) of the raw material 10 on which the intermediate forming regions BA are formed by using the ultrasonic inspection apparatus.

Accordingly, the ultrasonic inspection result measured at the measurement position corresponding to each functional unit is transmitted to the control unit.

As a result of the ultrasonic inspection, it is possible to grasp the internal defect position DP where impurities exist in the intermediate forming region BA at each measurement position.

That is, in each of the first, second, third and fourth intermediate forming areas BA1, BA2, BA3 and BA4, the internal defect position DP is formed in the first, second, third and fourth intermediate forming areas BA1, , BA4, or in an outer area.

If the internal defect position DP exists in the outer region of the intermediate forming region BA, it is predicted that no defect will occur in each of the final forming regions FA in the final component 500 And sets it in the control unit.

Next, the control unit may determine that the final part 500 is normal and instruct the other part to manufacture the final part 500 through the rolling process.

On the other hand, when the internal defect position DP exists inside the intermediate forming area BA, it is predicted that a defect will occur in each final forming area FA in the final part 500, Setting.

For example, in the shaft 100, if the internal defect position DP exists in the first intermediate forming area BA1, the final part 500 is finally positioned within the first final forming area FA1 of the shaft 501 It is predicted that internal defects may occur.

Then, the control unit controls the final part to be disposed of after the final part is determined to be defective.

More specifically, the ultrasonic inspection is performed at a plurality of positions spaced with respect to the raw material 10, that is, at the positions of the respective functional portions.

The frequency of occurrence of the internal defect position (DP) at each position is calculated.

If it is determined that the occurrence frequency reaches a predetermined reference frequency using the control unit, it is determined that the internal defect is generated in each of the final formed areas FA.

Here, in the control unit, a molding deformation amount in which the intermediate forming regions BA for the raw material 10 in each of the unit forming processes forms the final forming regions FA is set.

Next, the position of the internal defect generated in the intermediate forming regions BA for the raw material 10 in each of the unit forming processes is confirmed.

Then, the position of the identified internal defect is displayed in each of the final formed areas FA so as to correspond to the formed deformation amount.

Accordingly, the embodiment according to the present invention can grasp the position of the internal defect with respect to the intermediate forming regions in which the functional portions are to be formed in the unit forming step in advance, and predict the failure in the final part in advance.

The unit forming process according to the present invention includes steps of preparing a raw material 10, molding the raw material 10 into a round bar 20, and molding the raw material 10 into a booster 30 before molding the final part 500.

Thereafter, the unit forming process for molding the raw material 10 into the round bar 20 is performed, and then the ultrasonic inspection corresponding to the third step is performed. Thus, the internal defects Measure the position.

As described above, it is possible to predict whether or not a failure occurs in the functional units 501, 502, 503, and 504 of the final part 500. [

In addition, the forming step of the booster 30 may be the same as the above-described process.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

10: raw material
20: Round bar
30: Booster
100, 101, 102, 501: Shaft
200, 201, 202, 502: pin
300, 301, 302, 503:
400, 401, 402. 504: Rear flange
500: Final parts
BA, RA, BUA: intermediate forming area
FA: final forming area

Claims (8)

A first step of setting a final forming area constituting a functional part included in the final part;
A second step of preparing a raw material and setting an intermediate forming region for forming the final forming region in the raw material;
And a third step of determining whether or not an internal defect has occurred in the intermediate forming region and predicting an internal defect in the final part,
Wherein the first step sets the final formed area for each of the functional units when the function unit is a plurality of units,
In the second step, setting the plurality of intermediate forming regions to correspond to each of the final forming regions,
A plurality of unit forming processes are sequentially performed so that the raw materials prepared in the second step are sequentially formed into different shapes,
Setting the intermediate forming regions in each of the unit forming processes differently,
In the third step,
An ultrasonic inspection apparatus is prepared,
Performing ultrasonic inspection of the raw material in each of the unit forming processes using the ultrasonic inspection apparatus,
Determining whether or not internal defects are contained in the intermediate forming regions of the raw material in each of the unit forming processes as a result of the ultrasonic inspection,
And predicts whether the internal defect is generated in each of the final formed regions according to the determination result.
delete delete delete delete The method according to claim 1,
Wherein the ultrasonic inspection is performed at a plurality of positions spaced apart from the raw material,
Calculating the occurrence frequency of the internal defect at each of the positions,
Wherein when the occurrence frequency reaches a predetermined reference frequency, it is determined that the internal defect is generated in each of the final formed areas.
The method according to claim 1,
Wherein a molding deformation amount in which the intermediate forming regions for the raw material in each of the unit forming processes constitute the final forming regions is set.
8. The method of claim 7,
Determining the position of the internal defect generated in the intermediate forming regions with respect to the raw material in each of the unit forming processes,
And displaying the determined position of the internal defect in each of the final formed areas so as to correspond to the amount of the molded deformation.

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