KR102234161B1 - U-Bend fastening device for stress corrosion test - Google Patents

Abstract

The present invention relates to a U-bend fastening apparatus for a stress corrosion test. More specifically, the present invention relates to a U-bend fastening apparatus for a stress corrosion test, which comprises: a base frame; a fixing frame vertically standing on one side of the base frame; a horizontal moving unit installed on an upper side of the base frame to move horizontally; and a vertical moving unit installed on a front side in the center of the fixing frame to move vertically. In addition, a fastening unit is included for moving the horizontal moving unit in a horizontal direction, settling a sample with a penetrating hole on an upper side of the horizontal moving unit, moving the vertical moving unit in a vertical direction, pressurizing the upper side in the center of the sample toward the lower side, bending into the shape of ″U,″ and fixing the sample on the penetrating hole. The present invention aims to provide the U-bend fastening apparatus for the stress corrosion test, which is able to prevent the surface of materials from being damaged.

Description

U-Bend fastening device for stress corrosion test}

The present invention relates to a U-bend fastening device for a stress corrosion test, and more particularly, in order to evaluate the stress corrosion of the specimen according to the material, the specimen is bent in a "U" shape through a horizontal moving unit and a vertical moving unit, It relates to a U-bend fastening device for a stress corrosion test for a precise stress corrosion test by maintaining a "U" shape using a fastening unit in through grooves formed at both ends of the specimen.

In general, the U-Bend test piece manufacturing method is to make a U-Bending type support tool after processing it into a certain size, and compress it with a tensile tester or compression tester using a U-Bend type punch ball to form a U shape. -A "U"-shaped stress corrosion specimen was prepared by detaching the bent specimen and tightening the titanium bolt and nut to the part in contact with the specimen.

In the case of producing a specimen in the same way as above, a plurality of U-Bending support tools and “U”-shaped bending jigs for each dimension of specimens of different thicknesses should be provided, and if a U-Bend specimen is made by compression, it is polished. There was a problem that the surface of the specimen was scratched due to friction with the support tool and bend jig, and it was difficult to adjust the compression distance when U-Bending by compressing with a tensile tester, so the lower part of the "U"-shaped specimen was cold rolled and Due to the same work hardening deformation, a problem occurred in which the accuracy of the data of the stress corrosion test and the test could not be reproduced.

In addition, when the specimen is detached from the jig to make an accurate U-Bend when tightening with titanium bolts and nuts in the U-Bend state, a certain internal stress must be applied to each specimen, but the stress is not imposed and the spring back phenomenon occurs due to the elasticity of the metal plate. Since the U" shape is not maintained, it is formed in an elliptical "U" shape. As a result of the stress corrosion test, the accuracy of the data is degraded, and there is a problem that the test cannot be reproduced.

Republic of Korea Patent Publication No. 10-0185350

The present invention was conceived in view of the above problems, and an object of the present invention is to bend a specimen in a "U" shape through a horizontal moving unit and a vertical moving unit in order to evaluate the stress corrosion of the specimen according to the material. , It is to provide a U-bend fastening device for stress corrosion test to prevent damage to the surface of the material by fastening the fastening unit to the through grooves formed at both ends of the specimen to maintain a "U" shape with a constant stress.

The objects of the embodiments of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those of ordinary skill in the technical field to which the present invention pertains from the following description. .

According to a feature for achieving the object as described above, the base frame;

A fixed frame that is vertically erected on one side of the base frame;

A horizontal moving unit installed above the base frame and moving in a horizontal direction;

A vertical moving unit installed in the front of the center of the fixed frame and moving in a vertical direction;

The horizontal moving unit is moved in the horizontal direction, the specimen with through-holes is mounted on the horizontal moving unit, and the vertical moving unit is moved in the vertical direction to press the upper center of the specimen in a downward direction to form a "U" shape. It characterized in that it comprises a; and a fastening unit for fixing the specimen to the through hole after bending.

In addition, the horizontal moving unit,

First support brackets are installed on both sides of the lower part of the fixing frame, a first screw coupled with the first support bracket and having a threaded toward the center, and inserted into one side and the other side of the first screw in the left and right directions along the screw thread. It characterized in that it comprises a first and second moving frames that move to, and first and second rotary rolls axially coupled to the upper portion of the first and second moving frames.

In addition, the vertical movement unit,

A second support bracket is installed on the upper part of the fixing frame, a second screw coupled to the second support bracket, a third moving frame inserted into the second screw and moving in a vertical direction along a screw thread, and the third It characterized in that the head protruding forward is installed in the center of the moving frame.

In addition, the head is characterized in that the detachable.

In addition, a moving rail is installed in the upper width direction of the base frame, and the first and second moving frames are seated on the moving rail to move left and right.

In addition, a micrometer is installed on one side of the fixing frame to adjust the position of the specimen.

In addition, a moving handle connected to one side of the first screw to rotate the first screw is installed.

In addition, a clamp unit is installed on one side of the upper portion of the base frame, and is installed to be spaced apart from the second screw to clamp the lower side of the specimen.

In addition, a motor that is installed under the base frame and is axially coupled with the second screw to rotate the second screw is further installed.

According to the U-bend fastening device for a stress corrosion test according to the present invention, in order to evaluate the stress corrosion of the specimen according to the material, the specimen is bent in a "U" shape through a horizontal moving unit and a vertical moving unit, and both sides of the specimen There is an effect of preventing damage to the surface of the material by maintaining the "U" shape with a certain stress by fastening the fastening unit to the through hole formed at the end.

1 is a view showing a U-bend fastening device for a stress corrosion test according to an embodiment of the present invention,
2 is a view showing a state in which a specimen is seated on the horizontal moving unit in the U-bend fastening device for a stress corrosion test according to an embodiment of the present invention;
3 is a view showing a state in which a vertical moving unit presses a specimen in a U-bend fastening device for a stress corrosion test according to an embodiment of the present invention;
4 is a view showing a state in which a bent specimen is fixed by a fastening unit in the U-bend fastening device for a stress corrosion test according to an embodiment of the present invention;
5 is a view showing a state in which a specimen is fastened with a fastening unit according to an embodiment of the present invention.

The following objects, other objects, features, and advantages of the present invention will be easily understood through the following preferred embodiments related to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms.

Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

The embodiments described and illustrated herein also include complementary embodiments thereof.

In this specification, the singular form also includes the plural form unless specifically stated in the phrase. As used in the specification, "comprise" and/or "comprising" does not exclude the presence or addition of one or more other components.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific contents have been prepared to more specifically describe the invention and to aid in understanding. However, readers who have knowledge in this field to the extent that they can understand the present invention can recognize that it can be used without these various specific contents. In some cases, it should be mentioned in advance that parts that are commonly known in describing the invention and are not significantly related to the invention are not described in order to avoid confusion in describing the invention.

1 is a view showing a U-bend fastening device for a stress corrosion test according to an embodiment of the present invention, Figure 2 is a specimen horizontal moving unit in the U-bend fastening device for a stress corrosion test according to an embodiment of the present invention 3 is a view showing a state in which the vertical moving unit presses the specimen in the U-bend fastening device for a stress corrosion test according to an embodiment of the present invention, and FIG. A diagram showing a state in which a bent specimen is fixed with a fastening unit in a U-bend fastening device for a stress corrosion test according to an embodiment of the present invention, and FIG. 5 is a state in which the specimen according to an embodiment of the present invention is fastened to the fastening unit. It is a diagram showing.

The present invention relates to a U-bend fastening device for a stress corrosion test, and more particularly, in order to evaluate the stress corrosion of the specimen according to the material, the specimen is bent in a "U" shape through a horizontal moving unit and a vertical moving unit, It relates to a U-bend fastening device for a stress corrosion test for a precise stress corrosion test by maintaining a "U" shape using a fastening unit in through grooves formed at both ends of the specimen.

As shown in Figs. 1 to 5, the U-bend fastening device for the stress corrosion test of the present invention is largely based on a base frame 10, a fixed frame 20, a horizontal moving unit 30, a vertical moving unit 40, and fastening. It comprises a unit (100).

The base frame 10 is firmly fixed to the ground or a test table, and the fixing frame 20 is formed to stand vertically on one side of the base frame 10. Since the base frame 10 and the fixed frame 20 are in the form of a general jig, a description thereof will be omitted.

The horizontal moving unit 30 is installed above the base frame 10 to move in a horizontal direction, and the horizontal moving unit 30 includes first support brackets 31 on both sides of the lower part of the fixed frame 20. ) Is installed, the first screw 32 is coupled to the first support bracket 31 and has a threaded toward the center, and is inserted into one side and the other side of the first screw 32 in a horizontal direction along the thread. First and second moving frames (33, 34) to move to, and the first and second moving frames (33, 34) is a configuration comprising a first and second rotary rolls (35, 36) that are axially coupled to the upper portion.

At this time, the moving rail 11 is installed in the width direction of the upper surface of the base frame 10 so that the first and second moving frames 33 and 34 are seated and can be moved left and right. Stoppers (not shown) are installed at both ends of the moving rail 11 to prevent separation of the first and second moving frames 33 and 34.

That is, the horizontal moving unit 30 includes the first and second moving frames 33 and 34 on the first screw 32 installed through the first support bracket 31 as a medium. The first and second moving frames (33, 34) are moved along a thread formed toward the center of the outer circumferential surface, and the separation distance between the first and second moving frames (33, 34) is adjusted, and the specimen (1) of the first and second rotating rolls (35, 36) is When entering the upper part, the first and second rotating rolls 35 and 36 rotate in the entry direction to facilitate the movement of the specimen 1, and at a distance between the first and second moving frames 33 and 34. Accordingly, when the specimen 1 is bent in a "U" shape, the radius of curvature of the central portion of the specimen 1 can be adjusted.

In addition, in the present invention, it is preferable to perform a stress test by maintaining the radius of curvature of the center of the specimen (1) between R 5 and R 50.

In addition, a micrometer 21 for adjusting the position of the specimen 1 is installed on one side of the fixing frame 20, and the micrometer 21 is It is installed so as to correspond to the upper end, and after the specimen 1 is seated on the first and second rotating rolls 35 and 36, the first and second rotating rolls 35 and 36 are used to contact the end of the specimen 1 by using the micrometer 21. It can be finely adjusted to be located in the center of the two rotary rolls (35, 36).

In this way, a moving handle 37 connected to one side of the first screw 32 to rotate the first screw 32 is installed to manually adjust the separation distance between the first and second moving frames 33 and 34. In addition, a motor (not shown) is installed instead of the moving handle 37 to rotate the first screw 32 to automatically control the first and second moving frames 33 and 34 to move in the horizontal direction. have.

In addition, the vertical moving unit 40 is installed in the front of the center of the fixed frame 20 to move in a vertical direction, the vertical moving unit 40, a second support bracket ( 41) is installed, a second screw 42 coupled with the second support bracket 41, and a third moving frame 43 that is inserted into the second screw 42 and moves in a vertical direction along the thread And, it is a configuration including a head 44 protruding forward in the center of the third moving frame 43.

At this time, the head 44 may be manufactured in a circular or elliptical shape, and a structure in which the head 44 can be detached and attached to change the size of the head 44 according to the radius of curvature of the specimen 1 It is preferable to manufacture the head 44 by being fitted with one side of the third moving frame 43 or manufactured in a screw-coupled manner, so that the head 44 is detachably attached and the radius of curvature at the center of the specimen 1 Can be adjusted.

In this case, a motor 45 installed under the base frame 10 and axially coupled with the second screw 42 to rotate the second screw 42 is further installed.

The motor 45 rotates the second screw 42 to automatically control the third moving frame 43 and at the same time move the head 44 installed on the third moving frame 43 in a vertical direction. I can make it.

That is, the vertical moving unit 40 has the third moving frame 43 formed on the second screw 42 installed via the second support bracket 41 on the outer circumferential surface of the second screw 42. It moves along the thread and adjusts the distance to the third moving frame 43 in the vertical direction, and presses the upper center of the specimen 1 seated on the first and second rotary rolls 35 and 36 in a downward direction. This is to bend in a "U" shape.

In addition, it is installed on one side of the upper portion of the base frame 10, and is installed to be spaced apart from the second screw 42 to support the lower one side of the specimen 1 seated on the first and second rotating rolls 35 and 36. A clamp unit 50 to be used may be additionally installed.

The clamp unit 50 is a means for preventing the specimen 1 from being separated or separated by the vertical pressure when the vertical moving unit 40 presses the upper center of the specimen 1 in a downward direction.

At this time, the clamping unit 50 may be manufactured to slide in a vertical direction, and the clamping unit 50 is moved in a vertical direction by installing a pneumatic or hydraulic cylinder to prevent separation of the specimen 1 at the same time as clamping. In addition, by installing an anti-slip pad (not shown) at the end of the clamping unit 50, contact with the specimen may be achieved.

In addition, the fastening unit 100 is composed of a bolt 101, a nut 102, and a washer 103, the material of the fastening unit 100 is made of titanium, the fastening unit 100 is bent After inserting the bolt 101 into the through hole 2 formed on both sides of the “U”-shaped specimen 1, the washer 103 was inserted into the end of the bolt 101, and the nut 102 ) To maintain the "U" shape of the specimen (1) under a certain stress, it is possible to prevent damage to the surface of the material.

Hereinafter, the operation sequence of the U-bend fastening device for a stress corrosion test according to the present invention will be described in detail with reference to FIGS. 1 to 5.

First, a specimen 1 as a stress corrosion test object is selected, and the thickness and stiffness of the specimen 1 are considered. The specimen is made of stainless steel, and various other materials can be used as specimens for the stress test.

Thereafter, the U-bend fastening device for the stress corrosion test, which is the present inventor, is firmly installed on the ground or on the upper part of the test table.

The horizontal moving unit 30 is adjusted in a horizontal direction to adjust the radius of curvature of the specimen 1, and the first, The two moving frames 33 and 34 move along a thread formed on the outer circumferential surface of the first screw 32 toward the center, and the separation distance between the first and second moving frames 33 and 34 is adjusted.

When the specimen 1 enters the upper portion of the first and second rotary rolls 35 and 36, the first and second rotary rolls 35 and 36 rotate in the entry direction, thereby preventing the specimen 1 from moving. When the specimen 1 is bent in a "U" shape according to the distance between the first and second moving frames 33 and 34, the radius of curvature of the central portion of the specimen 1 can be adjusted. In the present invention, the radius of curvature at the center of the specimen 1 is preferably maintained between R 5 and R 50.

In addition, a micrometer 21 for adjusting the position of the specimen 1 on one side of the fixing frame 20 is the specimen 1 seated on the first and second rotating rolls 35 and 36. Using (21), the specimen (1) is brought into contact with the end of the specimen (1) and finely adjusted to be positioned in the center of the first and second rotary rolls (35, 36) to position the specimen (1).

Thereafter, the head 44 of the vertical moving unit 40 is installed on the third moving frame 44 by selecting a head 44 of an appropriate diameter in consideration of the radius of curvature at the center of the specimen 1. The motor 45 installed under the frame 10 is driven to rotate the second screw 42, and the third moving frame 43 and the head 44 installed on the second screw move in the vertical direction. The distance is adjusted and the upper center of the specimen 1 seated on the first and second rotary rolls 35 and 36 is pressed downward to bend it in a "U" shape.

At this time, the clamp unit 50 installed on one side of the upper portion of the base frame 10 supports the lower one side of the specimen 1 seated on the first and second rotary rolls 35 and 36, and the clamp unit 50 ) Can prevent the specimen 1 from being separated or separated by the vertical pressure when the vertical moving unit 40 presses the upper center of the specimen 1 in a downward direction.

The specimen (1) bent in a "U" shape has through holes (2) formed on both sides, inserted into the through holes (2) on both sides with a bolt (101), and then a washer (103) is inserted at the ends of the bolt (101). By inserting and tightening the nut 102 to maintain the "U" shape of the specimen 1 with a constant stress, it is possible to perform a precise stress corrosion test by preventing damage to the surface of the material.

Since the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention and do not represent all the technical spirit of the present invention, various equivalents that can replace them at the time of the present application It should be understood that there may be variations and variations.

1: specimen 2: through hole
10: base frame 11: moving rail
20: fixed frame 21: micrometer
30: horizontal moving unit 31: first support bracket
32: first screw 33: first moving frame
34: second moving frame 35: first rotating roll
36: second rotary roll 37: moving handle
40: vertical moving unit 41: second support bracket
42: second screw 43: third moving frame
44: head 45: motor
50: clamp unit 100: fastening unit
101: bolt 102: nut
103: washer

Claims (9)

A base frame 10;
A fixed frame 20 which is formed to stand vertically on one side of the base frame 10;
A horizontal moving unit 30 installed above the base frame 10 and moving in a horizontal direction;
A vertical moving unit 40 installed on the central front side of the fixed frame 20 and moving in a vertical direction;
The horizontal moving unit 30 is moved in the horizontal direction, the specimen 1 having the through hole 2 formed thereon is seated on the horizontal moving unit 30, and the vertical moving unit 40 is moved in the vertical direction. Including; a fastening unit 100 for fixing the specimen 1 to the through hole 2 after bending the specimen 1 in a "U" shape by pressing the upper center of the specimen 1 in a downward direction,
The horizontal moving unit 30,
First support brackets 31 are installed on both sides of the lower side of the fixing frame 20, a first screw 32 coupled with the first support bracket 31 and having a screw thread formed toward the center thereof, and the first The first and second moving frames 33 and 34 are inserted into one side and the other side of the screw 32 to move in the left and right directions along the thread, and the first and second movable frames 33 and 34 are axially coupled to the upper part. , U-bend fastening device for stress corrosion test, characterized in that it comprises a two-rotation roll (35, 36).
delete The method according to claim 1,
The vertical movement unit 40,
A second support bracket 41 is installed on the upper portion of the fixing frame 20, a second screw 42 coupled to the second support bracket 41, and inserted into the second screw 42 to reduce a thread. U-bend fastening device for stress corrosion test, characterized in that the third moving frame (43) moving in the vertical direction according to the, and the head (44) protruding forward in the center of the third moving frame (43) is installed.
The method of claim 3,
The head 44 is a U-bend fastening device for stress corrosion test, characterized in that the detachable.
The method according to claim 1,
A moving rail 11 is installed in the upper width direction of the base frame 10, and the first and second moving frames 33 and 34 are mounted on the moving rail 11 to move left and right. U-bend fastening device for stress corrosion test.
The method according to claim 1,
U-bend fastening device for stress corrosion test, characterized in that a micrometer (21) for adjusting the position of the specimen (1) is installed on one side of the fixing frame (20).
The method according to claim 1,
A U-bend fastening device for stress corrosion testing, characterized in that a moving handle (37) connected to one side of the first screw (32) to rotate the first screw (32) is installed.
The method of claim 3,
Stress corrosion characterized in that a clamp unit 50 installed on one side of the upper part of the base frame 10 and spaced apart from the second screw 42 to clamp the lower side of the specimen 1 is further installed U-bend fastener for testing.
The method of claim 8,
A U-bend for stress corrosion testing, characterized in that a motor 45 installed under the base frame 10 and axially coupled with the second screw 42 to rotate the second screw 42 is further installed Fastening device.

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