CN113454436A

CN113454436A - Instrumented press-in testing device

Info

Publication number: CN113454436A
Application number: CN202080014698.6A
Authority: CN
Inventors: 金光虎; 张喜光; 池正铉; 成俊虎
Original assignee: Frontics Inc
Current assignee: Frontics Inc
Priority date: 2019-02-18
Filing date: 2020-02-17
Publication date: 2021-09-28
Anticipated expiration: 2040-02-17
Also published as: KR102031197B1; WO2020171502A1; CN113454436B

Abstract

According to the present embodiment, there is provided an instrumented indentation test device that is installed on a test object to perform indentation testing, in which a displacement sensor does not slide even if the surface of the test object has a curvature, and that can measure the indentation depth, and that can be easily installed in a chamber that provides a high temperature environment for a test sample, and that can provide high accuracy and precision of the displacement sensor.

Description

Instrumented press-in testing device

Technical Field

The present invention relates to an instrumented indentation test device, and more particularly, to an instrumented indentation test device that is installed on a test object to perform an indentation test, in which a displacement sensor can accurately measure an indentation depth even if a surface of the test object has a curvature, and can be easily installed in a chamber that provides a high temperature environment for a test sample, and improve accuracy and precision of the displacement sensor.

Background

In general, a test apparatus such as a press-in test apparatus for measuring physical properties of a test object is installed in a laboratory for testing because of its large volume and weight. Recently, with the development of the related art, the volume and weight of the test device are greatly reduced, so that the test can be directly set on a test object in an industrial field.

Further, various parts or structures installed in the industrial fields of machinery, construction, chemistry, etc. are not only large in volume and weight, but also may be installed in a state where physical properties are changed or shapes, structures, etc. are deformed during installation on site, and therefore, in order to confirm the final safety of the installed structure, it is necessary to test the installed structure in a state where the structure is installed.

Therefore, the miniaturized test device is directly arranged on an arrangement structure of an industrial field for testing, particularly when the press-in test device is used for press-in testing, in the traditional press-in test device, a displacement sensor used for measuring the press-in depth of a press head is arranged on a press head shaft, a rod part and the press head form different shafts and are simultaneously supported on the surface of the arrangement structure, along with the press-in of the press head, the rod part slides along the shaft direction, and the displacement sensor measures the press-in depth.

However, when the surface of the installation structure has a curvature, the rod portion and the indenter have different axes when the indenter is pressed in, and therefore, the displacement sensor may slip due to the curvature, and the pressing depth may not be accurately measured.

In addition, most materials or members used in modern society such as power generation facilities such as nuclear power and thermal power, chemical facilities, gas pipelines, and the like are exposed not only at normal temperature but also at high temperature, and therefore, in order to have highly reliable equipment considering changes in physical properties of these materials from the design stage, it is necessary to measure physical properties of the materials at high temperature.

Therefore, the test apparatus performs a test by providing a chamber in which a test sample is provided with a high temperature environment and the inside is kept vacuum to perform heat insulation, and particularly in the case of a press-in test apparatus performing a press-in test, when a press head is pressed into the test sample, as for the conventional press-in test apparatus, both the press head and a displacement sensor provided on a shaft of the press head are provided in the chamber, so that there is a problem that it is difficult to provide the press-in test apparatus in the chamber, and accuracy and precision of the displacement sensor are lowered in the high temperature environment.

Disclosure of Invention

Problems to be solved by the invention

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an instrumented indentation testing device that is installed on a test object to perform indentation testing, in which a displacement sensor is not slid even if a surface of the test object has a curvature, and an indentation depth can be measured, and that is easily installed in a chamber that provides a high temperature environment for a test sample and maintains a vacuum, and that can improve accuracy and precision of the displacement sensor.

In addition, the object of the present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

Means for solving the problems

According to the present embodiment, there may be provided an instrumented indentation test device comprising: a body supported by the support frame and slid up and down by the driving part; a load sensor provided at a lower end portion of the body; the upper end part of the pressure head shaft is combined with the load sensor, and the lower end part of the pressure head shaft is combined with the pressure head; and a displacement sensor part including a scale bar coupled to one of the body and the support frame, and a sensor coupled to the other.

Effects of the invention

According to the embodiment, the instrumented indentation testing device can be provided, which is arranged on a test object and used for indentation testing, can measure the indentation depth without slippage of the displacement sensor even if the surface of the test object has curvature, can be easily arranged in a chamber providing a high-temperature environment for a test sample, and can improve the accuracy and precision of the displacement sensor.

Drawings

Fig. 1 is a perspective view showing the setting of an instrumented indentation test device according to the present embodiment.

Fig. 2 is a perspective view of an instrumented indentation test device according to this embodiment.

Fig. 3 to 4 are sectional views of fig. 2.

Fig. 5 to 7 are exploded perspective views of fig. 2.

Detailed Description

Hereinafter, some embodiments of the present embodiment will be described in detail by way of exemplary drawings. When reference numerals are added to constituent elements of respective drawings, it is to be noted that the same reference numerals are given as much as possible even when the same components are shown in different drawings. In describing the present embodiment, if it is considered that detailed description of related well-known configurations or functions may obscure the gist of the present embodiment, detailed description thereof will be omitted.

In addition, in describing the structural elements of the present embodiment, terms such as first, second, A, B, (a), (b), and the like may be used. These terms are only used to distinguish one structural element from another structural element, and the terms do not limit the nature, order, or sequence of the related structural elements. When a certain component is referred to as being "connected," "coupled," or "in contact with" another component, the component may be directly connected or in contact with the other component, and it is also understood that the component may be "connected," "coupled," or "in contact with" the other component.

Fig. 1 is a perspective view showing the provision of an instrumented indentation test device according to the present embodiment, fig. 2 is a perspective view of the instrumented indentation test device according to the present embodiment, fig. 3 to 4 are cross-sectional views of fig. 2, and fig. 5 to 7 are exploded perspective views of fig. 2.

The instrumented indentation test apparatus 100 according to the present embodiment includes: a body 230 supported by the support frame 220 and slid up and down by the driving part 210; a load cell 250 provided at a lower end portion of the body 230; a ram shaft 260 having an upper end coupled to the load cell 250 and a lower end coupled to a ram 261; and a displacement sensor part including a scale bar 242 coupled to one of the body 230 and the support frame 220, and a sensor 241 coupled to the other.

Referring to fig. 1, an instrumented press-in test device 100 according to the present embodiment is combined with a portable fixture 120 of a test object, such as a turbine rotor 110, fixed in an industrial field and performs a press-in test, and unlike a conventional press-in test device, a portion supported by a drive shaft 111 in the portable fixture 120 forms an inclination angle with a portion where the press-in test device is combined, so that even if a surface of the test object, such as a connection portion 115 of a blade 113 formed perpendicularly to the drive shaft 111, has a curvature, a displacement sensor 241 is not directly supported to the test object, and does not slide due to the curvature, and a press-in depth can be correctly measured.

Further, although not shown in the drawings, even when the press-in test is performed in combination with a chamber for providing a high temperature environment to the test sample and maintaining the inside in a vacuum state for insulation, the displacement sensor 241 is not combined with the ram shaft, and thus is easily combined with the chamber, and the displacement sensor is not affected by the high temperature environment.

Hereinafter, referring to fig. 2 to 3, in the drawings, in order to clearly show the components of the present embodiment, a bolt or the like that is coupled to each component is omitted.

The body 230 is supported by the support frame 220 and is slid up and down by the driving part 210, and a load sensor 250 is provided at a lower end of the body 230 to measure a load applied on the test object when the driving part 210 applies the load.

The upper end portion of the indenter shaft 260 is coupled to the load cell 250, and the lower end portion is coupled to the indenter 261, so that the indenter 261 is pressed into the surface of the test object when the driving unit 210 applies a load to the body 230.

As such an indenter 261, an indenter such as Vickers hardness (Vickers) or Berkovich diamond (Berkovich) can be selected and used.

Further, the displacement sensor section 240 is provided in order to measure the displacement generated on the surface of the test object by the load, that is, the depth of press-in of the indenter 261.

The displacement sensor unit 240 includes a scale bar 242 coupled to one of the body 230 and the support frame 220 and a sensor 241 coupled to the other, and measures a displacement of the body 230 sliding downward when pressed.

That is, the lower end frame 223, which will be described later, is coupled to the portable fixing device 120 or the like, so that the support frame 220 is fixed, and the displacement sensor unit 240 measures the displacement of the main body 230 relative to the support frame 220, thereby measuring the depth of press-in of the ram 261.

Therefore, unlike the conventional press-in test device in which the displacement sensor is combined with the indenter shaft and supported on the test object, and the pressure depth is measured by measuring the displacement of the rod that slides in the shaft direction at the time of press-in, in the instrumented press-in test device 100 according to the present embodiment, the displacement of the body 230 to the support frame 220 is measured by the displacement sensor section 240, and therefore the test object is supported only by the indenter 261, and even if the indenter 261 is supported on the surface of the test object that forms the curvature, the press-in depth of the indenter 261 can be measured correctly without worrying about the displacement sensor unit 240 sliding due to the curvature.

Further, the support frame 220 includes: a pair of middle end frames 222 facing each other with the body 230 interposed therebetween, an end frame 221 coupled to an upper end portion of the middle end frame 222, and a lower end frame 223 coupled to a lower end portion of the middle end frame 222. The lower end frame 223 is combined with the portable fixture 120, the chamber, etc. to fix the instrumented press test device 100. The middle end frame 222 is formed in a substantially square column shape, and allows the body 230 to be disposed between a pair of middle end frames and supports the up-and-down sliding of the body 230. The upper frame 221 is provided with a driving part 210 to apply a load to the body 230.

That is, the driving part 210 is coupled to the upper end frame 221, and the upper end of the body 230 is coupled to the connecting shaft 231 connected to the driving part 210, so that the power of the driving part 210 is transmitted to the body 230 through the connecting shaft 231.

As such a driving part 210, a motor may be used, and a connection shaft 231 is provided to penetrate the upper end frame 221, the lower end portion thereof is combined with the body 230, and the upper end portion is connected with the motor shaft via the hollow shaft 310.

The upper end portion of the hollow shaft 310 is coupled with the motor shaft and the lower end portion is coupled with the connecting shaft 231 through the ball screw, so that the rotation of the motor shaft is converted into the up-and-down movement of the connecting shaft by the ball screw. Thereby, the main body 230 can slide up and down, and the driving part 210 can apply a load to the main body 230.

The ram shaft 260 is provided to protrude downward through the lower end frame 223, and a ram 261 is coupled to a lower end portion of the ram shaft 260.

Therefore, when the press-fitting test is performed in the vacuum chamber or the like, the pressure head shaft 260 is not coupled to the displacement sensor unit 240, so that the installation is convenient and the displacement sensor unit 240 is not affected by a high-temperature environment.

Meanwhile, in order to smoothly slide the body 230 supported by the middle end frame 222 up and down, a sliding support member 433 is provided between the middle end frame 222 and the body 230.

That is, the sliding support member 433 may be provided between the inner surface of the middle frame 222 and the main body 230, a first groove 431 may be formed in the inner surface of the middle frame 222 in the axial direction, a second groove 435 opposed to the first groove 431 may be formed in the main body 230, and the sliding support member 433 may be provided in the first groove 431 and the second groove 435.

As the slide supporting member 433, a cross roller slide provided with a pair of rails provided with grooves formed in a lengthwise direction, and rollers or balls provided between the rails to slide both rails can be used, and thus it is suitable for the sliding motion in the supporting shaft direction in the present embodiment.

Accordingly, the two rails of the cross roller runner are inserted and coupled into the first and

second grooves

431 and 435, so that the body 230 is supported by the middle end frame 222 and smoothly slides when a load is applied to the body 230 by the driving part 210.

Further, as described above, the scale bar 242 and the sensor 241 of the displacement sensor part 240 are combined with the support frame 220 and the body 230. An embodiment in which the sensor 241 is coupled to the middle frame 222 and the scale 242 is coupled to the body 230 will be described below, but the present invention is not limited thereto, and the scale 242 may be coupled to the middle frame 222, the sensor 241 may be coupled to the body 230, or the sensor 241 may be coupled to the upper frame 221 or the lower frame 223.

The displacement sensor part 240 includes a first bracket 243 and a second bracket 244, and the sensor 241 and the support frame 220 are coupled by the first bracket 243 as a medium, and the scale bar 242 and the body 2307 are coupled by the second bracket 244 as a medium.

The first bracket 243 is provided with two or more

first blade portions

411 and 412 supported by the support frame 220, and two or more

second blade portions

413 and 414 supported by the sensor 241.

That is, the

first blade portions

411 and 412 and the

second blade portions

413 and 414 are supported by the support frame 220 and the sensor 241 on two or more surfaces, so that it is possible to minimize shaking when the body 230 slides, thereby suppressing the occurrence of errors.

In the embodiment illustrated in the drawings, two

first blade portions

411, 412 and

second blade portions

413, 414 are provided, respectively, and thus, the first bracket 243 may be formed in a cross shape.

Further, coupling holes are formed in at least one of the

first blade portions

411 and 412 and at least one of the

second blade portions

413 and 414, and the support frame 220 and the sensor 241 are formed with coupling holes communicating with the coupling holes of the

first blade portions

411 and 412 and the

second blade portions

413 and 414, so that the sensor 241, the first bracket 243, and the support frame 220 can be coupled by a coupling member such as a bolt.

The second bracket 244 may be provided with a first coupling portion 421 coupled to the body 230 and a second coupling portion 422 coupled to the scale bar 242.

As described above, since the scale bar 242 is supported by the sensor 241, the second coupling portion 422 may be formed to protrude laterally from the first coupling portion 421, and the scale bar 242 is supported at a side surface which is not supported by the

second blade portions

413, 414 among side surfaces of the sensor 241.

Similar to the

first blade portions

411 and 412 and the

second blade portions

413 and 414, coupling holes are also formed in the first coupling portion 421 and the second coupling portion 422, and coupling holes communicating therewith are also formed in the body 230 and the scale bar 242, so that the scale bar 242, the second bracket 244, and the body 230 can be coupled by coupling members such as bolts.

In addition, in the body 230 and the first coupling portion 421, one is formed with a first coupling groove 511, and the other may be formed with a first coupling protrusion 512 inserted into the first coupling groove 511.

Such a first coupling groove 511 and a first coupling protrusion 512 may be formed perpendicular to the axial direction, so that the first coupling protrusion 512 is supported up and down in the first coupling groove 511 when the body 230 slides up and down, and since the second bracket 244 is fixed up and down in the body 230, shaking may be minimized, thereby suppressing an error from occurring.

In addition, in the scale bar 242 and the second coupling portion 422, one is formed with a second coupling groove 521, and the other may be formed with a second coupling protrusion 522 inserted into the second coupling groove 521.

Such a second coupling groove 521 and a second coupling protrusion 522 may be formed in the axial direction, and therefore, when the body 230 slides up and down, since the scale bar 242 coupled with the second bracket 244 is aligned in the axial direction, it is possible to suppress the occurrence of an error when the sensor 241 measures the displacement of the scale bar 242.

According to the instrumented indentation test device having the above-described shape, since the displacement sensor is not directly coupled to the indenter shaft to support the test object, but the scale bar and the sensor are coupled to the support frame and the body to measure the indentation depth of the indenter, even if the surface of the test object has a curvature, there is no fear of slippage of the displacement sensor, and the indentation depth can be accurately measured. In addition, when the test object arranged in the vacuum chamber is pressed, the pressing test device can be easily arranged in the chamber, and the displacement sensor is not influenced by the high-temperature environment, so that the accuracy and the precision can be improved.

In the above, although the case where all the structural elements constituting the present embodiment are combined into one or combined together to operate has been described, the present embodiment is not meant to be necessarily limited to these embodiments. That is, within the scope of the object of the present embodiment, all the components can be selectively combined into one or more and operated.

In addition, in terms of the above description, including "includes", "constituting" or "having", related structural elements are meant to be intrinsic unless otherwise specifically stated to the contrary, and it is understood that other structural elements are not excluded, but may be included. Unless otherwise defined, all terms including technical or scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this embodiment belongs. As with the previously defined terms, the terms used generally should be interpreted to correspond to the literal meanings of the relevant art, and should not be interpreted in an ideal or excessive manner unless explicitly defined in the present embodiment.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which the present embodiment pertains can make various modifications and changes within a range not exceeding the essential characteristics of the present embodiment. Accordingly, the embodiments disclosed in the present embodiment are not intended to limit the technical ideas of the present embodiment, but to illustrate the present embodiment, and the scope of the technical ideas of the present embodiment is not limited to these embodiments. The scope of the present embodiment should be construed in accordance with the following claims, and all technical ideas within the scope and range of equivalents thereof should be construed to be included in the scope of the claims of the present embodiment.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority from U.S. patent application No. 10-2019-0018679, applied in korea at 2/18/2019 according to U.S. patent law bar 119(a) (35u.s.c § 119(a)), the entire contents of which are incorporated herein by reference. Meanwhile, if the present patent application claims priority from countries other than the united states for the same reason as described above, the entire contents thereof are incorporated by reference into the present patent application.

Claims

1. An instrumented indentation test device, comprising:

a body supported by the support frame and slid up and down by the driving part;

a load sensor coupled to a lower side of the body;

a pressure head shaft, the upper end of which is combined with the load sensor and the lower end of which is combined with a pressure head;

a displacement sensor part including a scale bar coupled to one of the body and the support frame, and a sensor coupled to the other.

2. The instrumented indentation test device of claim 1,

the support frame includes:

a pair of middle frames facing each other with the body interposed therebetween;

an upper end frame coupled to an upper end portion of the middle end frame; and

and a lower end frame coupled to a lower end portion of the middle end frame.

3. The instrumented indentation test device of claim 2,

the driving part is combined with the upper end frame, and the driving part and the body are combined by taking a connecting shaft penetrating through the upper end frame as a medium.

4. The instrumented indentation test device of claim 2,

the pressure head is arranged to penetrate through the lower end frame and protrude downwards.

5. The instrumented indentation test device of claim 2,

a sliding support component is arranged between the middle-end frame and the body.

6. The instrumented indentation test device of claim 5,

a first groove formed in an axial direction is formed in an inner side surface of the middle frame, a second groove opposed to the first groove is formed in the body, and the sliding support member is provided in the first groove and the second groove.

7. The instrumented indentation test device of claim 1,

the displacement sensor portion includes a first bracket and a second bracket, the sensor is combined with the support frame by the first bracket as a medium, and the scale bar is combined with the body by the second bracket as a medium.

8. The instrumented indentation test device of claim 7,

the first support frame is provided with two or more first blade portions supported by the support frame, and two or more second blade portions supported by the sensor.

9. The instrumented indentation test device of claim 7,

the second support is provided with a first combining part combined with the body and a second combining part combined with the scale strip.

10. The instrumented indentation test device of claim 9,

one of the body and the first coupling portion is formed with a first coupling groove, and the other is formed with a first coupling protrusion inserted into the first coupling groove.

11. The instrumented indentation test device of claim 10,

the first coupling groove and the first coupling protrusion are formed in a direction perpendicular to the axial direction.

12. The instrumented indentation test device of claim 9,

in the scale bar and the second coupling portion, one is formed with a second coupling groove, and the other is formed with a second coupling protrusion inserted into the second coupling groove.

13. The instrumented indentation test device of claim 12,

the second coupling groove and the second coupling protrusion are formed in an axial direction.