KR102497566B1 - Specimen fixing apparatus and its tester - Google Patents

Abstract

The present invention relates to a specimen fixing device and a testing machine capable of accurately and precisely evaluating physical properties by dividing and fixing specimens of different materials welded to each other with uniform surface pressure, comprising: an upper assembly; lower assembly; an upper left engagement block assembled to the upper assembly and fixing the upper left portion of the specimen; an upper right engagement block assembled to the upper assembly and fixing the upper right portion of the specimen; a lower left engagement block assembled to the lower assembly and fixing the lower left portion of the specimen; and a lower right engaging block assembled to the lower assembly and fixing the lower right part of the specimen.

Description

Specimen fixing apparatus and its tester {Specimen fixing apparatus and its tester}

The present invention relates to a specimen holding device and a testing machine, and more particularly, to a specimen holding device and a testing machine capable of accurately and precisely evaluating physical properties by dividing and fixing specimens of different materials welded to each other with uniform surface pressure.

In general, Tailored Welded Blank (TWB) welding uses laser to cut steel plates of different thicknesses and strengths into appropriate sizes and shapes, so that different materials can be used as one blank, and the desired shape can be formed through the forming process. It has the advantage of being able to be processed into products of

Representative automotive parts to which TWB welding is applied include center pillars, roof side outers, seat cross members, etc. It is mainly applied to crash members to improve crash performance and reduce weight.

Since the TWB welding part should not be damaged during a vehicle collision, the strength and rupture characteristics of the welding part itself should be evaluated from the design stage.

In the existing TWB welded tensile test method, specimens of different materials are used to allow load to be applied in the direction of 90 degrees along the longitudinal direction of the welded joint, and a method of evaluating strength and fracture by applying deformation at a quasi-static speed is used. .

However, when fixing a specimen of such a different material to a conventional general specimen gripping part (grip part), a difference in thickness between the different materials welded in the middle occurs, so when using a general fixing device used in an existing tensile test, The pressurization of the fixture can become very unstable.

That is, in the prior art, when fixing specimens of different materials, the specimen fixing device fixes only the thicker part and loosens the thinner part, so the load cannot be uniformly transmitted to the entire cross section of the specimen, and the load is biased. There was a problem in that correct tensile deformation could not be induced because rotational moment was generated in the specimen.

In addition, since a welded portion may protrude in the center of a specimen made of different materials, both ends of the specimen cannot be uniformly fixed due to interference with the protruded portion.

Korean Patent Application No. 10-2006-0106829

The present invention is intended to solve various problems, including the above problems, by fixing the upper and lower ear parts of a specimen of different materials in a 4-division manner, so that thickness deviation between different materials occurs or the central weld protrudes. Even if it is, it is possible to individually press and fix the specimens of different materials, and to maintain a uniform surface pressure even in a high-speed deformation state by using a wedge surface, and to accurately evaluate the physical properties of the central weldment with a uniform surface pressure on the left and right. It is an object of the present invention to provide a specimen fixing device and a testing machine capable of accurately measuring tensile strength and strain. However, these tasks are illustrative, and the scope of the present invention is not limited thereby.

A specimen fixing device according to the spirit of the present invention for solving the above problems includes an upper assembly; lower assembly; an upper left engagement block assembled to the upper assembly and fixing the upper left portion of the specimen; an upper right engagement block assembled to the upper assembly and fixing the upper right portion of the specimen; a lower left engagement block assembled to the lower assembly and fixing the lower left portion of the specimen; and a lower right engaging block assembled to the lower assembly and fixing the lower right part of the specimen.

In addition, according to the present invention, the upper assembly and the lower assembly are installed on the upper frame and the lower frame of the high-speed tensile tester, respectively, and the specimen is welded to the left base material and the right base material having different materials based on the center welded It may be a Tailored Welded Blank (TWB) welded specimen made of an I shape as a whole.

In addition, according to the present invention, a first spare space is formed between the upper left engagement block and the upper right engagement block so that the engagement blocks do not come into contact with the center welded portion, and the lower left engagement block and the lower right engagement block A second extra space may be formed therebetween.

Also, according to the present invention, the first partition wall part may be formed in at least a part of the first spare space, and the second partition wall part may be formed in at least a part of the second spare space.

In addition, according to the present invention, the upper left engagement block, the upper right engagement block, the lower left engagement block, and the lower right engagement block may each be a wedge block having an inclined wedge surface formed on at least a portion thereof. .

In addition, according to the present invention, the upper assembly, the upper fixing block fixed to the upper frame of the high-speed tensile tester; an upper intermediate block fixed to the upper fixing block with a fixture; and an upper pressing block fixed to the upper middle block with a fixture, receiving the upper left engagement block and the upper right engagement block, and having an inner pressing surface for pressing the upper left engagement block and the upper right engagement block. can include

In addition, according to the present invention, the lower assembly, a lower fixing block fixed to the lower frame of the high-speed tensile tester; a lower intermediate block fixed to the lower fixing block with a fixture; and a lower pressing block fixed to the lower middle block with a fixture, receiving the lower left engagement block and the lower right engagement block, and having an inner pressing surface for pressing the lower left engagement block and the lower right engagement block. can include

In addition, according to the present invention, the upper left pad is installed in the pad groove of the upper left engagement block, the upper left pad having a concave-convex surface in contact with the upper left portion of the specimen; an upper right pad installed in the pad groove of the upper right engagement block and having a concave-convex surface contacting the upper right portion of the specimen; a lower left pad installed in the pad groove of the lower left engagement block and having a concavo-convex surface contacting the lower left portion of the specimen; and a lower right pad installed in the pad groove of the lower right engagement block and having a concave-convex surface contacting the lower right portion of the specimen.

On the other hand, the testing machine according to the spirit of the present invention for solving the above problems may include the above-described specimen fixing device.

According to some embodiments of the present invention made as described above, by fixing the upper and lower ear portions of the specimen of different materials in a 4-division manner, even if a thickness deviation between different materials occurs or a central weld protrudes, different materials Each specimen can be pressed and fixed individually, and uniform surface pressure can be maintained even in a high-speed deformation state by using a wedge surface. And it has the effect of measuring strain. Of course, the scope of the present invention is not limited by these effects.

1 is an external perspective view showing a specimen fixing device and a tester according to some embodiments of the present invention.
FIG. 2 is a perspective view showing an installation state of engagement blocks of the specimen fixing device of FIG. 1 .
FIG. 3 is a bottom perspective view illustrating an upper left engagement block and an upper right engagement block of the specimen fixing device of FIG. 1 .
4 is a perspective view illustrating a lower left engagement block and a lower right engagement block of the specimen fixing device of FIG. 1;
5 is an enlarged perspective view showing engagement blocks of the specimen fixing device of FIG. 2 in an enlarged manner.
FIG. 6 is an enlarged front view of engagement blocks of the specimen fixing device of FIG. 5 .
7 is a perspective view illustrating engagement blocks of the specimen fixing device of FIG. 1;
8 is a conceptual diagram illustrating divided surface pressures applied to a specimen in the specimen fixing device of FIG. 1 .

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

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in many different forms, and the scope of the present invention is as follows It is not limited to the examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation.

Hereinafter, embodiments of the present invention will be described with reference to drawings schematically showing ideal embodiments of the present invention. In the drawings, variations of the depicted shape may be expected, depending on, for example, manufacturing techniques and/or tolerances. Therefore, embodiments of the inventive concept should not be construed as being limited to the specific shape of the region shown in this specification, but should include, for example, a change in shape caused by manufacturing.

1 is an external perspective view illustrating a specimen holding device 100 and a testing machine 1000 according to some embodiments of the present invention, and FIG. 2 is a view of engagement blocks B1 to B8 of the specimen holding device 100 of FIG. 1 . It is a perspective view showing the installation state, and FIG. 3 is a bottom perspective view showing the upper left engagement block (B1) (B2) and the upper right engagement block (B3) (B4) of the specimen fixing device of FIG. FIG. 4 is a perspective view illustrating lower left engagement blocks B5 and B6 and lower right engagement blocks B7 and B8 of the specimen fixing device of FIG. 1 .

First, as shown in FIGS. 1 to 4, the specimen fixing device 100 according to some embodiments of the present invention includes an upper assembly 10, a lower assembly 20, and engagement blocks B1 to B8 ) may be included.

For example, as shown in FIG. 1, the upper assembly 10 and the lower assembly 20 may be installed on an upper frame (not shown) and a lower frame (not shown) of a high-speed tensile tester, respectively. It may be part of a high-speed tensile tester 1000 capable of testing the specimen 1 of the material.

Here, as shown in FIG. 1, in the specimen 1, the left base part 1-1 and the right base part 1-2 of different materials are welded based on the central welded part W to the upper end. It may be a TWB (Tailored Welded Blank) welded specimen made of an I shape as a whole in which an ear portion is formed and an ear portion is formed at a lower end.

However, the shapes or types of the specimen 1 and the tester 1000 are not necessarily limited thereto, and very various shapes or types of specimens and testers may all be applied.

More specifically, for example, as shown in FIG. 3, the upper assembly 10 includes an upper fixing block 11 fixed to the upper frame of the high-speed tensile tester 1000, and the upper fixing block 11 The upper middle block 12 fixed with a fixture to the upper middle block 12 and the upper middle block 12 are fixed with a fixture, and accommodates the upper left engagement block (B1) (B2) and the upper right engagement block (B3) (B4) and an upper pressing block 13 formed with an inner pressing surface for pressing the upper left engagement block B1 and B2 and the upper right engagement block B3 and B4.

Therefore, when the user fixes the upper fixing block 11 and the upper intermediate block 12 to the upper frame of the high-speed tensile tester 1000 and then fixes the upper pressing block 13 with a fixture, the upper left side The engagement block (B1) (B2) and the upper right engagement block (B3) (B4) convert the upper and lower clamping force of the fixture in the horizontal direction using the wedge surface, so that the upper left engagement block (B1) (B2) and the upper The right biting block (B3) (B4) can firmly fix the upper ear portion of the specimen by split surface pressure.

In addition, for example, as shown in FIG. 4, the lower assembly 20 includes a lower fixing block 21 fixed to the lower frame of the high-speed tensile tester, and a lower fixing block 21 fixed to the lower fixing block 21 with a fixture. It is fixed to the middle block 22 and the lower middle block 22 with fixtures, and accommodates the lower left engagement block B5 and B6 and the lower right engagement block B7 and B8, and the lower left engagement block. It may include a lower pressing block 23 formed with an inner pressing surface for pressing the blocks B5 and B6 and the lower right engagement block B7 and B8.

Therefore, when the user fixes the lower fixing block 21 and the lower middle block 22 to the lower frame of the high-speed tensile tester 1000 and then fixes the lower pressing block 23 with a fixture, the lower left side The engagement block (B5) (B6) and the lower right engagement block (B7) (B8) convert the upper and lower clamping force of the fixture to the horizontal direction using the wedge surface, so that the lower left engagement block (B5) (B6) and the lower The right biting block (B7) (B8) can firmly fix the lower ear portion of the specimen by split surface pressure.

FIG. 5 is an enlarged perspective view showing the engagement blocks B1 to B8 of the specimen holding device 100 of FIG. 2 in an enlarged manner, and FIG. 6 is an enlarged view of the engagement blocks B1 to B8 of the specimen holding device 100 of FIG. 5 . 7 is a perspective view showing the engagement blocks B1 to B8 of the specimen fixing device 100 of FIG. 1 .

5 to 7, a total of eight engagement blocks B1 to B8 of the specimen holding device 100 according to some embodiments of the present invention are assembled to the upper assembly 10, , Upper left engagement blocks B1 and B2 fixing the upper left portion of the specimen 1 and upper right engagement blocks B3 assembled to the upper assembly 10 and fixing the upper right portion of the specimen 1 ) (B4), assembled to the lower assembly 20, and assembled to the lower left engagement blocks B5 and B6 for fixing the lower left part of the specimen 1 and the lower assembly 20, the specimen (1) may include lower right engagement blocks B7 and B8 for fixing the lower right portion.

Here, as shown in FIGS. 5 and 6, the upper left engagement block B1 and B2 and the upper right engagement block (B1 to B8) do not contact the center welded portion (W). A first spare space A1 is formed between B3 and B4, and a second spare space A2 is formed between the lower left engagement block B5 and B6 and the lower right engagement block B7 and B8. can be formed.

Therefore, as shown in FIGS. 3 and 4, the first spare space A1 and the second spare space A2 are sufficiently secured, and the left engagement blocks B1, B2, B5, and B6 are formed. A first partitioning wall part S1 is formed in at least a part of the first spare space A1 so that the right fitting blocks B3, B4, B7, and B8 can be spaced apart from each other, and the second A second partition wall portion S2 may be formed in at least a portion of the spare space A2.

In addition, for example, as shown in FIG. 5, the upper left engagement block (B1) (B2), the upper right engagement block (B3) (B4), the lower left engagement block (B5) (B6), and Each of the lower right engagement blocks B7 and B8 may be a wedge block having an inclined wedge surface F formed on at least a portion thereof.

On the other hand, as shown in FIG. 5, the specimen fixing device 100 according to some embodiments of the present invention is installed in the pad groove of the upper left engagement block B1 and B2, respectively, and the specimen 1 ) are installed in the pad grooves of the upper left pad (P1) (P2) and the upper right engagement block (B3) (B4), respectively, on which the concave-convex surface in contact with the upper left part of the specimen (1) is formed. It is installed in the pad groove of the upper right pad (P3) (P4) and the lower left engagement block (B5) (B6), respectively, on which the concave-convex surface in contact with the upper right part is formed, and the lower left part of the specimen (1) It is installed in the pad groove of the lower left pad (P5) (P6) and the lower right engagement block (B7) (B8), respectively, in which the concave-convex surface in contact with is formed, and is in contact with the lower right part of the specimen (1) Lower right pads P7 and P8 having concavo-convex surfaces may be further included.

Therefore, by installing each of the pads P1 to P8 in each of the engagement blocks B1 to B8, the divided frictional force with the specimen 1 may be further increased.

However, the pads P1 to P8 are not limited to the drawings, and may be integrally formed with the engagement blocks B1 to B8 or may be omitted.

FIG. 8 is a conceptual diagram showing divided surface pressures applied to the specimen 1 in the specimen fixing device of FIG. 1 .

Therefore, as shown in FIG. 8, the upper and lower ear portions of the specimen 1 of the different materials are firmly fixed with 4-division pressure, respectively, and a load is applied to perform high-speed tension. As what can be tested, even if there is a thickness deviation between the different materials of the specimen 1 or the central weld W protrudes beyond the thickness of the specimen 1, each of the different materials can be individually pressed and fixed, By using the wedge surface, uniform surface pressure can be maintained even in high-speed deformation, and accurate physical property evaluation of the central welded part can be performed with uniform surface pressure on the left and right sides, and tensile strength and strain can be measured more accurately.

Meanwhile, as shown in FIGS. 1 to 8 , the present invention may include a testing machine 1000 including the above-described specimen fixing device 100.

In the specimen fixing device included in the testing machine 1000, the composition and role of each component of the specimen breaking device 100 as shown in FIGS. 1 to 8 may be the same as each other. Therefore, detailed description will be omitted.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: Psalms
1-1: left parent material
1-2: right parent material
W: center weld
10: upper assembly
11: upper fixing block
12: upper middle block
13: upper pressing block
B1, B2: upper left bite block
B3, B4: upper right bite block
B5, B6: lower left bite block
B7, B8: lower right bite block
A1: 1st free space
A2: 2nd free space
S1: 1st dividing wall part
S2: 2nd dividing wall part
F: wedge plane
20: lower assembly
21: lower fixing block
22: lower middle block
23: lower pressing block
P1, P2: Upper left pad
P3, P4: Upper right pad
P5, P6: Lower left pad
P7, P8: Lower right pad
100: specimen holding device
1000: tester

Claims (9)

upper assembly;
lower assembly;
an upper left engagement block assembled to the upper assembly and fixing the upper left portion of the specimen;
an upper right engagement block assembled to the upper assembly and fixing the upper right portion of the specimen;
a lower left engagement block assembled to the lower assembly and fixing the lower left portion of the specimen; and
a lower right engagement block assembled to the lower assembly and fixing the lower right end of the specimen; including,
The upper assembly and the lower assembly are respectively installed on the upper frame and the lower frame of the high-speed tensile tester,
The specimen is a Tailored Welded Blank (TWB) welded specimen made of an I shape as a whole by welding the left base material and the right base material of different materials based on the central welded part,
A first spare space is formed between the upper left engagement block and the upper right engagement block so that the engagement blocks do not come into contact with the center welded portion,
A second spare space is formed between the lower left engagement block and the lower right engagement block,
A first partition wall portion is formed in at least a portion of the first extra space so that the first extra space can be formed,
A second separation wall portion is formed in at least a portion of the second extra space so that the second extra space can be formed. delete delete delete According to claim 1,
The upper left engagement block, the upper right engagement block, the lower left engagement block, and the lower right engagement block are wedge blocks each having an inclined wedge surface formed on at least a portion thereof. According to claim 1,
The upper assembly,
An upper fixing block fixed to the upper frame of the high-speed tensile tester;
an upper intermediate block fixed to the upper fixing block with a fixture; and
An upper pressing block fixed to the upper middle block with a fixture, accommodating the upper left engagement block and the upper right engagement block, and having an inner pressing surface for pressing the upper left engagement block and the upper right engagement block; Including, a specimen holding device. According to claim 1,
The lower assembly,
A lower fixing block fixed to the lower frame of the high-speed tensile tester;
a lower intermediate block fixed to the lower fixing block with a fixture; and
A lower pressing block fixed to the lower middle block with a fixture, accommodating the lower left engagement block and the lower right engagement block, and having an inner pressing surface for pressing the lower left engagement block and the lower right engagement block; Including, a specimen holding device. According to claim 1,
an upper left pad installed in the pad groove of the upper left engagement block and having a concave-convex surface contacting the upper left portion of the specimen;
an upper right pad installed in the pad groove of the upper right engagement block and having a concave-convex surface contacting the upper right portion of the specimen;
a lower left pad installed in the pad groove of the lower left engagement block and having a concavo-convex surface contacting the lower left portion of the specimen; and
a lower right pad installed in the pad groove of the lower right engagement block and having a concave-convex surface contacting the lower right part of the specimen;
Further comprising a specimen holding device. A testing machine comprising the specimen holding device according to any one of claims 1 and 5 to 8.

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