CN114199711B - Torque calibration method for tension-torsion fatigue testing machine - Google Patents
Torque calibration method for tension-torsion fatigue testing machine Download PDFInfo
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- CN114199711B CN114199711B CN202111440674.XA CN202111440674A CN114199711B CN 114199711 B CN114199711 B CN 114199711B CN 202111440674 A CN202111440674 A CN 202111440674A CN 114199711 B CN114199711 B CN 114199711B
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/62—Manufacturing, calibrating, or repairing devices used in investigations covered by the preceding subgroups
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention belongs to the technical field of calibration of test instruments, and discloses a torque calibration method of a tension-torsion fatigue testing machine, which comprises the steps of firstly installing a sensor to be tested and a sensor connecting flange; adjusting an output shaft of the tension-torsion fatigue testing machine to be centered with a sensor to be tested; the integral module of the standard sensor is connected to the upper part of the sensor connecting flange; the special calibrating connecting shaft is connected with an output shaft connecting flange at the bottom of the output shaft; after the square shaft of the special calibration connecting shaft is aligned with the square counter bore on the upper surface of the special calibration connecting flange, the output shaft is regulated to descend to clearance fit with the square counter bore; parameters of the tension-torsion fatigue testing machine are adjusted to enable torque values output by the standard sensor and the to-be-tested sensor to be consistent, and calibration is completed; and finally, removing the whole module of the calibration special connecting shaft and the standard sensor. The calibration method can finish calibration without professional calibration personnel, can avoid installation errors in the whole process, and has simple operation and strong repeatability.
Description
Technical Field
The invention belongs to the field of calibration of test instruments, and particularly relates to a torque calibration method of a tension-torsion fatigue testing machine.
Background
Fatigue failure can be classified into single-axis fatigue failure and multi-axis fatigue failure. As the uniaxial fatigue is relatively easy to study, the study of the uniaxial fatigue failure by students in related fields at home and abroad is more at present, and a perfect theoretical system is formed. However, in practical engineering problems, the materials are subjected to complex loads, that is, the materials undergo multiple-axis fatigue failure at most, so that the research on the multiple-axis fatigue failure is needed to be in depth.
The tension-torsion compound fatigue is taken as a typical multiaxial fatigue mode, and is also intensively studied by domestic scholars. The research on the tension-torsion fatigue failure is mainly applied to a tension-torsion fatigue testing machine, so that the material fails under the mechanical environment under the combined action of tension and torque, and further, the critical working condition of fatigue failure is obtained. The torque of the tension-torsion fatigue testing machine is obtained through a torque sensor, and the data precision and accuracy of the torque sensor directly influence the performance of the tension-torsion testing machine, so that the torque calibration of the tension-torsion fatigue testing machine is very important.
The traditional torque calibration is mostly to send a torque sensor to a metering laboratory, and the torque is statically and manually calibrated by using a torque wrench by a professional, and the traditional torque calibration is also a method of adding weights by using a force arm lever, so that time and labor are wasted, and the calibrated sensor inevitably generates installation errors when being installed on a machine. The maximum torque of the electronic universal tensile force optical testing machine is 50 N.m, the precision reaches thousandth position, the precision requirement cannot be met by manual calibration, and errors can be generated due to the pretightening force of the bolts when the calibrated torque sensor is reinstalled, so that the precision cannot be ensured. A new calibration method is therefore needed to calibrate the torque sensor installed on the test machine.
Disclosure of Invention
The invention aims to solve the technical problem that an installed torque sensor is inconvenient to calibrate, and provides a torque calibration method of a tension-torsion fatigue testing machine.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention provides a torque calibration method of a tension-torsion fatigue testing machine, which comprises the following steps:
(1) Fixing a sensor to be tested on an operating platform of a tension-torsion fatigue testing machine through a bottom flange plate, and installing a sensor connecting flange on the top of the sensor to be tested;
(2) After adjusting an output shaft of the tension-torsion fatigue testing machine to be centered with the sensor to be tested, vertically lifting the output shaft to reserve the operation space of the steps (3) to (4);
(3) Connecting an integral module of a standard sensor to the upper part of the sensor connecting flange; the integral module of the standard sensor comprises an assembled special calibration connecting flange, a standard sensor and a sensor connecting piece, wherein the special calibration connecting flange and the sensor connecting piece are respectively connected to the upper part and the lower part of the standard sensor;
the center of the upper surface of the special calibration connecting flange is provided with a square counter bore;
(4) Connecting a special calibration connecting shaft with an output shaft connecting flange at the bottom of the output shaft; the special calibration connecting shaft comprises a square shaft;
(5) After the square shaft of the special calibration connecting shaft is aligned with the square counter bore on the upper surface of the special calibration connecting flange, the output shaft is regulated to descend until the bottom surface of the square shaft of the special calibration connecting shaft is contacted with the bottom surface of the square counter bore; after the square shaft of the special calibration connecting shaft is in clearance fit with a square counter bore on the upper surface of the special calibration connecting flange;
(6) Adjusting parameters of a tension-torsion fatigue testing machine to enable torque values output by the standard sensor and the sensor to be tested to be consistent; repeating the operation until the average value of the five times of statistics errors is not higher than 0.001;
(7) And removing the whole module of the calibration special connecting shaft and the standard sensor, wherein the sensor connecting flange and the sensor to be measured are not removed.
Further, the sensor connecting flange comprises a flange surface, and the flange surface is respectively provided with annular uniform bolt holes for connecting the sensor to be detected and annular uniform bolt holes for connecting the sensor connecting piece.
Furthermore, the special connecting flange for calibration comprises a flange surface, and annular uniformly distributed bolt holes for connecting the standard sensor are formed in the flange surface.
Further, the sensor connecting piece comprises an upper flange disc surface and a lower flange disc surface, wherein the upper flange disc surface and the lower flange disc surface are connected by a cylinder, and the upper flange disc surface, the lower flange disc surface and the cylinder are coaxial; the sensor connecting piece is connected with the standard sensor through bolts through the upper flange surface, and the sensor connecting piece is connected with the sensor connecting flange through bolts through the lower flange surface.
Further, the square shaft top of the special calibrating connecting shaft is provided with a flange surface, and the flange surface is provided with circumferentially uniform bolt holes for connecting the output shaft connecting flange
The beneficial effects of the invention are as follows:
the calibration can be completed without professional calibration personnel by adopting the calibrated standard sensor, the sensor to be measured is arranged on the machine to complete the calibration, the installation error is avoided in the whole process, the operation is simple, and the repeatability is strong. The standard sensor adopts a disassembly-free design, so that disassembly and assembly errors introduced in the calibration process are greatly reduced; meanwhile, the special connecting shaft and the special connecting flange are used for calibrating, torque is transmitted through clearance fit between the square shaft and the square counter bore, and the clamp is avoided, so that operation complexity caused by the clamp and uncontrollable errors caused by the operation are prevented, and the systematic errors of calibration are greatly reduced.
Drawings
FIG. 1 is an operation schematic diagram of a torque calibration method of a tension-torsion fatigue testing machine.
In the above figures: 1. a motor; 2. an output shaft; 3. the output shaft is connected with the flange; 4. calibrating a special connecting shaft; 5. calibrating a special connecting flange; 6. a standard sensor; 7. a sensor connection; 8. a sensor connecting flange; 9. and a sensor to be measured.
Detailed Description
For a further understanding of the nature, features, and effects of the present invention, the following examples are set forth to illustrate, and are to be considered in connection with the accompanying drawings:
as shown in fig. 1, the embodiment provides a torque calibration method of a tension-torsion fatigue testing machine, which comprises the following steps:
(1) The sensor 9 to be measured is fixed on an operating platform of the tension-torsion fatigue testing machine through a bottom flange plate, and then the sensor connecting flange 8 is installed on the top of the sensor 9 to be measured and used for installing the standard sensor 6 in subsequent operation. The sensor 9 to be measured is calibrated after being installed and is not dismantled after being calibrated, so that the installation error caused by the fact that the sensor 9 to be measured is installed to a testing machine after being calibrated by a traditional method is avoided.
The sensor connecting flange 8 comprises a flange surface with the diameter of 100mm, the diameter of a central opening is 6.5mm, 8 inner hexagonal bolt cylindrical countersunk holes of M6 are uniformly formed in the annular direction of the flange surface at the position, which is 33mm away from the center of the circle, and four M6 threaded holes are uniformly formed in the annular direction of the position, which is 36mm away from the center of the circle. 8M 6 screw holes are uniformly formed in the circumferential direction of the top surface of the sensor 9 to be detected, and the sensor is connected with the sensor connecting flange 8 through hexagon socket head cap screws.
(2) The output shaft 2 of the tension-torsion fatigue testing machine is adjusted, so that the output shaft 2 is centered with a sensor 9 to be tested on an operation table, and then the output shaft 2 is vertically lifted to reserve a mounting space for subsequent operation.
The output shaft 2 of the tension-torsion fatigue testing machine is driven by a motor 1, and the bottom of the output shaft 2 is fixedly connected with an output shaft connecting flange 3. The motor 1, the output shaft 2 and the output shaft connecting flange 3 are all original parts of the tension-torsion fatigue testing machine.
(3) The integral module of the standard sensor 6 is connected to the sensor connection flange 8.
The integral module of the standard sensor 6 comprises the standard sensor 6, a calibration special connecting flange 5 connected to the upper part of the standard sensor 6 and a sensor connecting piece 7 connected to the lower part of the standard sensor 6; the special calibrating connecting flange 5, the standard sensor 6 and the sensor connecting piece 7 are connected in advance before the step (3).
The standard sensor 6 is a sensor calibrated in a metering yard and provided with a calibration certificate.
The special calibrating connecting flange 5 comprises a flange surface with the diameter of 100mm, and a square counter bore with the side length of 25mm and the depth of 10mm is arranged in the center of the upper surface of the special calibrating connecting flange; 8M 6 hexagon head bolt countersunk holes are uniformly formed in the annular direction of the position, which is 33mm away from the center of the circle, of the flange surface, and the flange surface is used for being connected with a standard sensor 6 through hexagon head bolts.
The sensor connecting piece 7 comprises an upper flange surface and a lower flange surface, wherein the upper flange surface and the lower flange surface are connected by a cylinder, and the upper flange surface, the lower flange surface and the cylinder are coaxial. The upper flange surface of the sensor connecting piece 7 is connected with the standard sensor 6 through bolts, and the lower flange surface of the sensor connecting piece 7 is used for being connected with the sensor connecting flange 8 through bolts.
Because the special connecting flange 5 for calibration, the standard sensor 6 and the sensor connecting piece 7 are all installed and dismantled in the form of integral modules, the system errors caused by the disassembly and assembly of the special connecting flange 5 for calibration, the standard sensor 6 and the sensor connecting piece 7 can be eliminated.
(4) And connecting the calibration special connecting shaft 4 with the output shaft connecting flange 3.
The special calibrating connecting shaft 4 comprises a square shaft with the height of 60mm and the diameter of 25 multiplied by 25mm, a flange disc surface with the diameter of 100mm is arranged at the top of the square shaft, and 4M 6 hexagon head bolt countersunk holes are uniformly formed in the annular direction of the top of the flange disc surface at a position 36mm away from the circle center. The flange surface of the special calibrating connecting shaft 4 is used for being connected with the output shaft connecting flange 3 through a hexagon head bolt. The square shaft of the special calibration connecting shaft 4 is in clearance fit with the square counter bore on the upper surface of the special calibration connecting flange 5.
(5) Adjusting the angle of the output shaft connecting flange 3 to enable the square shaft of the special calibration connecting shaft 4 to be aligned with the square counter bore on the upper surface of the special calibration connecting flange 5, and then adjusting the output shaft 2 of the tension-torsion fatigue testing machine to descend until the bottom surface of the square shaft of the special calibration connecting shaft 4 is contacted with the bottom surface of the square counter bore on the upper surface of the special calibration connecting flange 5;
(6) The output torque of the tension-torsion fatigue testing machine acts on the standard sensor 6 and the sensor 9 to be tested through the special calibrating connecting shaft 4. And (3) adjusting parameters of the tension-torsion fatigue testing machine to enable torque values output by the standard sensor 6 and the to-be-tested sensor 9 to be consistent, and repeating the process until the average value of the error of the five times is not higher than 0.001, and considering that the calibration is completed.
(7) And removing the whole modules of the special calibration connecting shaft 4, the special calibration connecting flange 5, the standard sensor 6 and the sensor connecting piece 7, wherein the sensor connecting flange 8 and the sensor 9 to be measured do not need to be removed, so that the calibration is completed.
(8) And the tension-torsion fatigue test can be carried out by installing clamps on the output shaft connecting flange 3 and the sensor connecting flange 8 respectively.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative, not restrictive, and many changes may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are to be construed as falling within the scope of the present invention.
Claims (3)
1. The torque calibration method of the tension-torsion fatigue testing machine is characterized by comprising the following steps of:
(1) Fixing a sensor to be tested on an operating platform of a tension-torsion fatigue testing machine through a bottom flange plate, and installing a sensor connecting flange on the top of the sensor to be tested;
(2) After adjusting an output shaft of the tension-torsion fatigue testing machine to be centered with the sensor to be tested, vertically lifting the output shaft to reserve the operation space of the steps (3) to (4);
(3) Connecting an integral module of a standard sensor to the upper part of the sensor connecting flange; the integral module of the standard sensor comprises an assembled special calibration connecting flange, a standard sensor and a sensor connecting piece, wherein the special calibration connecting flange and the sensor connecting piece are respectively connected to the upper part and the lower part of the standard sensor;
the sensor connecting piece comprises an upper flange surface and a lower flange surface, wherein the upper flange surface and the lower flange surface are connected by a cylinder, and the upper flange surface, the lower flange surface and the cylinder are coaxial; the sensor connecting piece is connected with the standard sensor through bolts through the upper flange surface, and the sensor connecting piece is connected with the sensor connecting flange through bolts through the lower flange surface;
the center of the upper surface of the special calibration connecting flange is provided with a square counter bore;
(4) Connecting a special calibration connecting shaft with an output shaft connecting flange at the bottom of the output shaft;
the special calibrating connecting shaft comprises a square shaft, a flange disc surface is arranged at the top of the square shaft, and annular uniformly distributed bolt holes for connecting the output shaft connecting flange are formed in the flange disc surface;
(5) After the square shaft of the special calibration connecting shaft is aligned with the square counter bore on the upper surface of the special calibration connecting flange, the output shaft is regulated to descend until the bottom surface of the square shaft of the special calibration connecting shaft is contacted with the bottom surface of the square counter bore; after the square shaft of the special calibration connecting shaft is in clearance fit with a square counter bore on the upper surface of the special calibration connecting flange;
(6) Adjusting parameters of a tension-torsion fatigue testing machine to enable torque values output by the standard sensor and the sensor to be tested to be consistent; repeating the operation until the average value of the five times of statistics errors is not higher than 0.001;
(7) And removing the whole module of the calibration special connecting shaft and the standard sensor, wherein the sensor connecting flange and the sensor to be measured are not removed.
2. The torque calibration method of the tension-torsion fatigue testing machine according to claim 1, wherein the sensor connecting flange comprises a flange surface, and the flange surface is respectively provided with annular uniform bolt holes for connecting the sensor to be tested and annular uniform bolt holes for connecting the sensor connecting piece.
3. The torque calibration method of the tension-torsion fatigue testing machine according to claim 1, wherein the special calibration connecting flange comprises a flange surface, and annular uniform bolt holes for connecting the standard sensor are formed in the flange surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111440674.XA CN114199711B (en) | 2021-11-30 | 2021-11-30 | Torque calibration method for tension-torsion fatigue testing machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111440674.XA CN114199711B (en) | 2021-11-30 | 2021-11-30 | Torque calibration method for tension-torsion fatigue testing machine |
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| CN114199711A CN114199711A (en) | 2022-03-18 |
| CN114199711B true CN114199711B (en) | 2024-01-09 |
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2021
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| Publication number | Publication date |
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| CN114199711A (en) | 2022-03-18 |
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