CN219798607U - Residual stress equipment calibrating device based on C-shaped ring sample - Google Patents
Residual stress equipment calibrating device based on C-shaped ring sample Download PDFInfo
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- CN219798607U CN219798607U CN202321299693.XU CN202321299693U CN219798607U CN 219798607 U CN219798607 U CN 219798607U CN 202321299693 U CN202321299693 U CN 202321299693U CN 219798607 U CN219798607 U CN 219798607U
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- side plate
- shaft pin
- supporting shaft
- shaped ring
- residual stress
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- 210000004907 gland Anatomy 0.000 claims abstract description 10
- 230000035882 stress Effects 0.000 description 54
- 238000000034 method Methods 0.000 description 10
- 230000006835 compression Effects 0.000 description 9
- 238000007906 compression Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses a residual stress equipment calibration device based on a C-shaped ring sample, which comprises a base, a first side plate and a second side plate, wherein the first side plate and the second side plate are arranged on the base; the first side plate is provided with a first supporting shaft pin, the second side plate is provided with a second supporting shaft pin, and the first supporting shaft pin and the second supporting shaft pin are coaxial; the second supporting shaft pin penetrates through the second side plate, a standard spring is sleeved at one end of the second supporting shaft pin, which penetrates out of the second side plate and is opposite to the first side plate, a spring gland is further arranged at one side of the standard spring, which is opposite to the second side plate, and a nut is further arranged at one end of the second supporting shaft pin, which penetrates out of the spring gland; c-shaped ring samples are mounted on the first support shaft pin and the second support shaft pin; according to the utility model, the tension applied to the C-shaped sample supporting shaft pin is changed by adjusting the tightening nut and changing the length of the spring, so that a plurality of residual stress values in a range can be calibrated by using the same device, and the efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of residual stress calibration, in particular to a residual stress equipment calibration device based on a C-shaped ring sample.
Background
The reasonable calibration method is a key technical means for ensuring the accuracy and reliability of the test result. The method for calibrating the residual stress measuring instrument is less studied at home and abroad, and the standard sample is manufactured by various methods to calibrate the residual stress measuring instrument; the other is to load a certain size of sample by a standard tensile testing machine, and complete the calibration of a residual stress measuring instrument by the stress value of the sample;
nondestructive testing of residual stress has been receiving a great deal of attention, and ultrasonic methods are one of the main testing methods, which mainly utilize the change in sound velocity of ultrasonic waves in a material to be tested to reflect the stress state. The theory of the ultrasonic method is mature, but according to the principle of acoustic elasticity, the ultrasonic method detects the relative residual stress value, and in order to realize the detection of the absolute residual stress value, a certain method needs to be adopted to calibrate the detection result and the detection system.
At present, the preparation method of standard residual stress standard samples cannot ensure the accuracy of absolute stress values of test blocks, and the calibration of residual stress instruments by using the test samples has great errors, so that the residual stress is traced to an international basic quantity, and it is necessary to perfect a test method to ensure the accuracy of the residual stress.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide a residual stress equipment calibration device based on a C-shaped ring sample, which solves the problem that the calibration of the residual stress instrument by the sample in the prior art has great error.
In order to solve the technical problems, the utility model adopts the following technical scheme: the residual stress equipment calibration device based on the C-shaped ring sample comprises a base, and further comprises a first side plate and a second side plate which are arranged on the base;
the first side plate is provided with a first supporting shaft pin, the second side plate is provided with a second supporting shaft pin, and the first supporting shaft pin and the second supporting shaft pin are coaxial;
the second supporting shaft pin penetrates through the second side plate, a standard spring is sleeved at one end of the second supporting shaft pin, which penetrates out of the second side plate and is opposite to the first side plate, a spring gland is further arranged at one side of the standard spring, which is opposite to the second side plate, and a nut is further arranged at one end of the second supporting shaft pin, which penetrates out of the spring gland;
c-shaped ring samples are arranged on the first supporting shaft pin and the second supporting shaft pin;
the utility model also has the following technical characteristics:
the first side plate and the second side plate are connected with the base through a first connecting bolt and a second connecting bolt respectively;
compared with the prior art, the utility model has the following technical effects:
according to the utility model, by adjusting the tightening nut and changing the length of the spring to change the pulling force applied to the standard C-shaped sample supporting shaft pin, a plurality of residual stress values in a range can be calibrated by using the same device, and the efficiency is improved.
The utility model adopts the C-shaped ring sample, has simple structure, is easy to process and treat in batches, does not need to apply pressure in the sample preparation process, and can avoid influencing the absolute stress value in the sample preparation process.
(III) the opening of the C-shaped ring adopted by the utility model allows an operator to measure the compressive stress and the tensile stress respectively on the two side surfaces of the top of the C-shaped ring by turning over the C-shaped ring, thereby increasing the calibration range of the device.
And (IV) calibrating the force value of the standard spring by an electronic universal tester to ensure that the standard spring provides a stable force value in an elastic range, and measuring the compression displacement of the standard spring to obtain the compression force value of the spring.
The utility model has simple and compact structure, easy processing, convenient installation and disassembly, convenient field use, and long-time storage without influencing the absolute stress value inside the C-shaped ring.
Drawings
FIG. 1 is a schematic view of the overall structure of the present utility model;
meaning of the individual reference numerals in the drawings:
1-a base; 2-a first side plate; 3-a second side plate; 4-a first support shaft pin; 5-a second support shaft pin; 6-standard springs; 7-spring gland; 8-a nut; a 9-C ring sample; 10-a first connecting bolt; 11-a second connecting bolt;
the following examples illustrate the utility model in further detail.
Detailed Description
The following specific embodiments of the present utility model are provided, and it should be noted that the present utility model is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present utility model fall within the protection scope of the present utility model.
The terms "upper," "lower," "front," "rear," "top," "bottom," and the like are used herein to refer to an orientation or positional relationship merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, with interior and exterior references to the interior and exterior of the corresponding component profiles, and the above terms are not to be construed as limiting the utility model.
In the present utility model, unless otherwise indicated, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.
All parts of the utility model, unless otherwise specified, are known in the art.
Example 1:
according to the technical scheme, as shown in fig. 1, the residual stress equipment calibration device based on the C-shaped ring sample comprises a base 1, a first side plate 2 and a second side plate 3, wherein the first side plate 2 and the second side plate 3 are arranged on the base 1;
the first side plate 2 is provided with a first supporting shaft pin 4, the second side plate 3 is provided with a second supporting shaft pin 5, and the first supporting shaft pin 4 and the second supporting shaft pin 5 are coaxial;
the second supporting shaft pin 5 penetrates through the second side plate 3, a standard spring 6 is sleeved at one end of the second supporting shaft pin 5 penetrating out of the second side plate 3 and facing away from the first side plate 2, a spring gland 7 is further arranged at one side of the standard spring 6 facing away from the second side plate 3, and a nut 8 is further arranged at one end of the second supporting shaft pin 5 penetrating out of the spring gland 7;
the first support shaft pin 4 and the second support shaft pin 5 are provided with C-shaped ring samples 9;
the C-ring sample 9 is required to relieve its initial stress after initial processing. The method adopted is heat treatment, and the C-shaped ring sample 9 is slowly and uniformly heated from room temperature state in a heat treatment furnace (heating speed is V 1 200 ℃/h) to 300-400 ℃, wherein the specific temperature is determined according to the material of the C-shaped ring sample 9, and then isothermal for 0.5-1 hour, wherein the specific time is determined according to the thickness and the size of the C-shaped ring sample 9, so that the whole temperature of the C-shaped ring sample 9 is uniform. Then by V 1 The heating rate of (a) is 550-650 ℃ (specific temperature depends on the material of the C-ring sample 9) and the temperature is kept for 6-8 hours (specific time depends on the thickness and size of the C-ring sample 9). Then the temperature is slowly cooled to below 120 ℃ in a heat treatment furnace (the cooling speed V is less than or equal to 250 ℃/h), and then the furnace is taken out and cooled to the room temperature. After the heat treatment is completed, the oxide film on the surface of the C-shaped ring sample 9 is cleaned.
When the C-shaped ring sample 9 is installed, a notch of the C-shaped ring sample 9 can be upwards or downwards, and the C-shaped ring sample 9 is fixedly connected with a supporting shaft pin 4 and a second supporting shaft pin 5;
the nut 8 can drive the second supporting shaft pin 5 to move so as to drive the standard spring 6 and the C-shaped ring sample 9 to deform; the second supporting shaft pin 5 is a threaded rod, through structural design, the nut 8 is screwed in the opening of the second side plate 3, the spring gland 7 is driven to compress the standard spring 6, the standard spring 6 is compressed and then the second supporting shaft pin 5 is driven to move towards the nut 8, so that the C-shaped ring sample 9 is driven to stretch, and the purpose of pulling the C-shaped ring sample 9 is achieved.
The C-shaped ring sample adopts a C-shaped structure, the material is spring steel subjected to quenching and medium temperature tempering treatment, and the vibration aging treatment can ensure that the C-shaped ring sample only has low-level residual stress;
by screwing the nut, the outer diameter of the C-shaped ring sample 9 is adjusted, and stress values with different sizes can be generated in a calibration area and used for field calibration operation of the ultrasonic stress detector.
The calibration area refers to the outside of the top of the C-ring sample 9 on the side opposite to its own notch;
before use, the relation between the top strain value of the C-shaped ring sample 9 and the stress value at the supporting shaft pin and the relation between the standard spring deformation and the force value are established through experiments, and then the relation between the top stress value of the C-shaped ring sample 9 and the standard spring deformation can be calculated, when the calibrating device is used, the compression length of the spring can be changed through adjusting the tightening nut, the stress value applied to the C-shaped ring sample 9 at the moment is obtained through measuring the spring deformation, and the calibration of the residual stress measuring equipment is completed.
As one preferable example of the present embodiment:
the first side plate 2 and the second side plate 3 are respectively connected with the base 1 through a first connecting bolt 10 and a second connecting bolt 11; the device is convenient to install and disassemble, convenient to use on site and capable of being disassembled after measurement is finished;
the application process of the utility model is as follows:
(1) Calibration of C-ring sample 9: and sticking strain gauges on two side surfaces of the top of the C-shaped ring sample 9, applying tension to the C-shaped ring 9 by clamping the first support shaft pin 4 and the second support shaft pin 5 by using a tension tester, and measuring the relation between the strain values of the strain gauges on two sides of the C-shaped ring 9 and the tension of the tension tester.
(2) Calibration of standard spring 6: the standard spring 6 is compressed by using a tensile tester, and the relation between the standard spring compression 6 and the spring force value is measured.
(3) A relationship between the stress values on both sides of the top of the C-ring sample 9 and the compression of the standard spring 6 was established. And (3) fitting a result based on the test values obtained in the steps 1 and 2 for nonlinear relation.
(4) C-shaped ring sample 9 and standard spring 6 are assembled on base 1, first side plate 2 and second side plate 3, make C-shaped ring keep vertical, screw nut 8 into a section distance, use slide caliper to measure the length of standard spring 6 this moment, obtain standard spring 6's compression, and then obtain C-shaped ring sample 9 top stress value.
(5) And detecting the residual stress value at the top of the C-shaped ring sample 9 by adopting an ultrasonic stress detector according to related detection standards to obtain a measured value of the residual stress at the top of the C-shaped ring sample 9 at the moment.
(6) The nut 8 is screwed into a certain distance again, the length of the standard spring 6 at the moment is measured by using a vernier caliper, the compression amount of the standard spring 6 is obtained, and then the top stress value of the C-shaped ring sample 9 is obtained.
(7) And detecting the residual stress value at the top of the C-shaped ring sample 9 by adopting an ultrasonic stress detector according to related detection standards to obtain a measured value of the residual stress at the top of the C-shaped ring sample 9 at the moment.
(8) After a plurality of measurements, the detection capability of the residual stress detection device is evaluated against the residual stress measurement value measured by the ultrasonic stress detector and the stress value obtained by the device through the compression amount of the standard spring 6.
And comparing the residual stress measured value measured by the ultrasonic stress detector each time with the stress value obtained by the device through the compression amount of the standard spring 6, if the stress deviation is less than or equal to 10MPa, the detection result is considered to be reliable, the ultrasonic stress detector does not need to be calibrated, and if the stress deviation is more than 10MPa, the zero stress of the ultrasonic stress detector needs to be calibrated again.
While the utility model has been described with respect to the preferred embodiments, it is to be understood that the utility model is not limited thereto, but is intended to cover modifications and alternatives falling within the spirit and scope of the present utility model as disclosed by those skilled in the art without departing from the spirit and scope of the present utility model.
Claims (2)
1. The residual stress equipment calibrating device based on the C-shaped ring sample comprises a base (1) and is characterized by further comprising a first side plate (2) and a second side plate (3) which are arranged on the base (1);
the first side plate (2) is provided with a first supporting shaft pin (4), the second side plate (3) is provided with a second supporting shaft pin (5), and the first supporting shaft pin (4) and the second supporting shaft pin (5) are coaxial;
the second supporting shaft pin (5) penetrates through the second side plate (3), a standard spring (6) is sleeved at one end, which is opposite to the first side plate (2), of the second supporting shaft pin (5), a spring gland (7) is further arranged at one side, opposite to the second side plate (3), of the standard spring (6), and a nut (8) is further arranged at one end, which penetrates through the spring gland (7), of the second supporting shaft pin (5);
c-shaped ring samples (9) are arranged on the first supporting shaft pin (4) and the second supporting shaft pin (5).
2. The residual stress device calibration apparatus according to claim 1, wherein,
the first side plate (2) and the second side plate (3) are connected with the base (1) through a first connecting bolt (10) and a second connecting bolt (11) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321299693.XU CN219798607U (en) | 2023-05-26 | 2023-05-26 | Residual stress equipment calibrating device based on C-shaped ring sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321299693.XU CN219798607U (en) | 2023-05-26 | 2023-05-26 | Residual stress equipment calibrating device based on C-shaped ring sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219798607U true CN219798607U (en) | 2023-10-03 |
Family
ID=88180435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321299693.XU Active CN219798607U (en) | 2023-05-26 | 2023-05-26 | Residual stress equipment calibrating device based on C-shaped ring sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219798607U (en) |
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2023
- 2023-05-26 CN CN202321299693.XU patent/CN219798607U/en active Active
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