CN211528045U - High-temperature fatigue test fixture - Google Patents
High-temperature fatigue test fixture Download PDFInfo
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- CN211528045U CN211528045U CN201922071266.6U CN201922071266U CN211528045U CN 211528045 U CN211528045 U CN 211528045U CN 201922071266 U CN201922071266 U CN 201922071266U CN 211528045 U CN211528045 U CN 211528045U
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- outer sleeve
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- ejector rod
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- 238000009661 fatigue test Methods 0.000 title claims abstract description 31
- 238000012360 testing method Methods 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a high temperature fatigue test anchor clamps belongs to the technical field for the high temperature fatigue test. The test fixture comprises a base, an external locking nut, an outer sleeve, a mandril, an internal locking nut and a replaceable clamping block; wherein: the base is provided with a mandril hole; the outer sleeve and the base are fixed together through an external locking nut, and the ejector rod extends into the outer sleeve; the upper end of the ejector rod is provided with a cylindrical boss, the upper part of the replaceable clamping block is used for screwing in a threaded end of a sample to be tested, and the lower part of the replaceable clamping block is sleeved on the cylindrical boss of the ejector rod; the replaceable clamping block is fixed on the outer sleeve through an inner locking nut. The fixture can effectively avoid generating a gap between the sample and the high-temperature fixture in the test process through the improvement of the structure, and can continuously lock the sample in the test process, thereby greatly improving the test precision and accuracy of the high-temperature fatigue test.
Description
Technical Field
The utility model relates to a technical field, concretely relates to high temperature fatigue test anchor clamps are used in high temperature fatigue test.
Background
The failure of a component due to metal fatigue accounts for about 80% of all the failure failures of the component. Fatigue fracture of metal components often has the characteristics of sudden and catastrophic, and aviation disasters caused by component failure exist along with the emergence of airplanes, and serious political and economic problems are caused by each occurrence of air crash, so that the aviation industry pays the most attention to fatigue research of materials. The function of an aircraft engine as a key component of an aircraft is self-evident, and once the engine fails during operation, the consequences thereof are not reasonable. Because the working characteristics of the engine are high temperature, high speed and frequent starting, the high temperature and low cycle fatigue test aiming at the aeroengine material is more important.
The locking device of the traditional mechanical high-temperature clamp is positioned in a high-temperature furnace, the high-temperature furnace cannot be opened in the experimental process and then the sample cannot be locked for the second time, once a gap appears in the high-temperature tension-compression fatigue test process, the gap cannot be effectively eliminated, the stress condition of the material near the zero point can be suddenly changed, on one hand, the experimental data can be inaccurate, and on the other hand, the testing machine can be even caused to be out of control, so that the serious consequence is generated.
Another disadvantage of conventional high temperature clamps is: the sample is directly screwed on the high-temperature clamp, and the threads connected with the sample by the traditional high-temperature clamp are directly machined on the high-temperature clamp and cannot be replaced. With the increase of the service life, the damage phenomenon of the screw thread can be avoided, but the screw thread and the traditional high-temperature clamp are integrated, so that the screw thread can only be maintained and cannot be replaced, and once the screw thread cannot be maintained, the high-temperature clamp can be scrapped. This occurs because, on the one hand, the test progress is affected by the longer period required for remanufacturing the hot-jig, and on the other hand, the hot-jig is wasted due to the higher production cost.
In order to improve the testing accuracy of the material in the high-temperature low-cycle fatigue test, a clamp capable of continuously locking a sample in the testing process needs to be developed, so that the service life of the material under the working environment condition is reflected more truly, and a reliable reference is provided for the subsequent component design.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high temperature fatigue test anchor clamps, this anchor clamps can avoid producing the clearance between test in-process sample and high temperature anchor clamps effectively through the improvement of structure, and can continue to lock the sample in the experimentation, have greatly improved high temperature fatigue test's measuring accuracy and accuracy. The high-temperature fatigue test fixture also has the characteristics of simple operation, convenient maintenance and the like.
In order to achieve the above object, the utility model adopts the following technical scheme:
a high-temperature fatigue test fixture comprises a base, an external locking nut, an outer sleeve, an ejector rod, an internal locking nut and a replaceable clamping block; wherein: the base is provided with a cylindrical boss, and the upper surface of the boss is provided with a mandril hole; the outer sleeve is arranged on the base, the outer sleeve is fixed with the boss of the base through an external locking nut, and the ejector rod extends into the outer sleeve; the upper end of the ejector rod is provided with a cylindrical boss, the upper part of the replaceable clamping block is used for screwing in a threaded end of a sample to be tested, and the lower part of the replaceable clamping block is sleeved on the cylindrical boss of the ejector rod; and after the lower end of the replaceable clamping block is sleeved at the upper end of the ejector rod, the replaceable clamping block is fixed on the outer sleeve through the inner locking nut.
The side surface of the cylindrical boss is provided with external threads, the external locking nut is provided with internal threads, and the external locking nut and the cylindrical boss are in threaded fit to realize detachable connection; the outer side of the lower part of the outer sleeve is provided with an annular boss, and the upper part of the inner side of the outer locking nut is also provided with an annular boss; the annular boss on the inner side of the external locking nut is lapped on the annular boss on the outer side of the outer sleeve, so that the relative position of the external locking nut and the outer sleeve is fixed.
The ejector rod extends into the outer sleeve, and the lower end face of the ejector rod extends into the ejector rod hole and is attached to the bottom face of the ejector rod hole.
The replaceable clamping block is provided with an upper inner hole and a lower inner hole which are communicated, the upper inner hole is provided with internal threads and is used for screwing in a threaded end of a sample to be tested until the end part of the sample slightly extends out of the upper inner hole; the lower inner hole is sleeved on the cylindrical boss of the ejector rod; the diameter D1 of the upper inner hole of the replaceable clamping block is smaller than the diameter D2 of the lower inner hole, and the diameter of the cylindrical boss of the ejector rod is between D1 and D2.
And the threaded end of the sample to be tested is screwed into the inner hole at the upper part of the replaceable clamping block and slightly extends out, and is attached to the upper end face of the cylindrical boss of the ejector rod.
The upper part of the outer sleeve is provided with internal threads, an upper inner hole and a lower inner hole are formed in the inner locking nut, and the upper part of the inner locking nut is sleeved on the upper part of the replaceable clamping block; the lower part of the inner locking nut is provided with internal threads, and the upper part of the outer sleeve is detachably connected with the inner locking nut through thread matching.
The test fixture is used in a matched mode, one test fixture is used for clamping the upper end (upper fixture) of a sample, the other test fixture is used for clamping the lower end (lower fixture) of the sample, after the test fixture is installed in a high-temperature furnace, an inner locking nut of the test fixture is located in the high-temperature furnace, an outer locking nut is located outside the high-temperature furnace, and the test fixture can be free of gaps between the sample and the test fixture by tightening the outer locking nut in the test process.
The utility model has the advantages and beneficial effects as follows:
the utility model discloses redesign high temperature fatigue test anchor clamps, great degree has improved the shortcoming of traditional anchor clamps, can effectively avoid appearing the clearance in the experimentation, and this has greatly improved high temperature fatigue test's measuring accuracy and accuracy. And the screw thread matched with the clamp is standardized, so that the screw thread can be quickly replaced once the screw thread is damaged, the time and the cost are saved, and the test efficiency is improved.
(1) Designing a high-temperature clamp: traditional high temperature anchor clamps only have a locking device, and locking device is located the high temperature furnace, and novel high temperature anchor clamps become hollow through structural optimization on the basis of traditional anchor clamps, and the centre passes the superalloy stick as experimental bearing, becomes two locking devices with anchor clamps under the prerequisite that does not change high temperature anchor clamps structural rigidity, and a department is located the high temperature furnace for lock when installing the sample. And the other part is positioned outside the high-temperature furnace and used for carrying out external secondary locking on a gap caused by factors such as different expansion coefficients of the sample and the clamp, sample deformation in the loading process and the like in the experiment process after the high-temperature furnace is installed, so that the inaccuracy of the experiment result caused by the gap and the potential safety hazard of the experiment equipment are thoroughly eliminated.
(2) Detachable sample screw clamp piece: the screw thread on the traditional high-temperature clamp is changed by structure to enable the sample screw thread clamp block to be detachable. And the sample thread clamping block is locked on the high-temperature clamp through an additional large nut. Meanwhile, some common sample thread clamps are processed for standby, and after the sample thread clamping blocks are damaged in the using process, the test can be directly and quickly carried out by replacing the standby thread clamping blocks, so that the test efficiency is greatly improved, and the maintenance cost of the experimental equipment is also reduced.
Drawings
Fig. 1 is the structure schematic diagram of the high-temperature fatigue test fixture of the utility model.
Fig. 2 is the schematic view of the connection between the outer sleeve, the base and the external locking nut in the high-temperature fatigue test fixture of the utility model.
Fig. 3 is the utility model discloses base structure in the high temperature fatigue test anchor clamps.
Fig. 4 shows the external locking nut structure of the high-temperature fatigue test fixture of the utility model.
Fig. 5 is a round bar sample to which the present invention is directed.
Wherein: 1-a base; 101-a cylindrical boss; 102-a jack rod hole; 2-external locking nut; 3-an outer sleeve; 4-a top rod; 5-replaceable clamping blocks; 6-screwing the nut internally; 7-round bar sample; 8-ring boss.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The utility model discloses mainly design to the high temperature fatigue anchor clamps that are applicable to pole sample 7, during the experiment, a whole set of anchor clamps include two the utility model discloses anchor clamps divide into anchor clamps and lower anchor clamps.
As shown in fig. 1-5, the high-temperature fatigue test fixture comprises a base 1, an external locking nut 2, an outer sleeve 3, a mandril 4, an internal locking nut 6 and a replaceable clamping block 5; the concrete structure and connection relation of each part are as follows:
as shown in fig. 2, a cylindrical boss 101 is arranged on the base 1, and a mandril hole 102 is arranged on the upper surface of the cylindrical boss; the outer side surface of the cylindrical boss is provided with an external thread, the external locking nut is provided with an internal thread, and the external locking nut is in threaded fit with the cylindrical boss to realize detachable connection; the outer side of the lower part of the outer sleeve is provided with an annular boss 8, and the upper part of the inner side of the outer locking nut is also provided with the annular boss 8; the annular boss on the inner side of the external locking nut is lapped on the annular boss on the outer side of the outer sleeve, so that the outer sleeve is guaranteed to be pressed by the external locking nut and does not move, and the relative position of the external locking nut and the outer sleeve is fixed.
The bottom end face of the outer sleeve is provided with a small bulge, the upper end face of the cylindrical boss of the base is provided with a corresponding groove, and when the outer sleeve is placed on the cylindrical boss, the small bulge on the outer sleeve just extends into the groove on the cylindrical boss, so that the outer sleeve and the base are relatively fixed.
The ejector rod extends into the outer sleeve, and the lower end face of the ejector rod extends into the ejector rod hole and is attached to the bottom face of the ejector rod hole.
The upper end of the ejector rod is provided with a cylindrical boss, the replaceable clamping block is provided with an upper inner hole and a lower inner hole which are communicated, the upper inner hole is provided with internal threads and is used for screwing in a threaded end of a sample to be tested and screwing in the threaded end until the end part of the sample slightly extends out of the upper inner hole; the lower inner hole is sleeved on the cylindrical boss of the ejector rod; the diameter D1 of the upper inner hole of the replaceable clamping block is smaller than the diameter D2 of the lower inner hole, and the diameter of the cylindrical boss of the ejector rod is between D1 and D2.
And after the lower end of the replaceable clamping block is sleeved at the upper end of the ejector rod, the replaceable clamping block is fixed on the outer sleeve through the inner locking nut.
And the threaded end of the sample to be tested is screwed into the inner hole at the upper part of the replaceable clamping block and slightly extends out, and is attached to the upper end face of the cylindrical boss of the ejector rod.
The upper part of the outer sleeve is provided with internal threads, an upper inner hole and a lower inner hole are formed in the inner locking nut, and the upper part of the inner locking nut is sleeved on the upper part of the replaceable clamping block; the lower part of the inner locking nut is provided with internal threads, and the upper part of the outer sleeve is detachably connected with the inner locking nut through thread matching.
The test fixture is used in a matched mode, one test fixture is used for clamping the upper end (upper fixture) of a sample, the other test fixture is used for clamping the lower end (lower fixture) of the sample, after the test fixture is installed in a high-temperature furnace, an inner locking nut of the test fixture is located in the high-temperature furnace, an outer locking nut is located outside the high-temperature furnace, and the test fixture can be free of gaps between the sample and the test fixture by tightening the outer locking nut in the test process.
The utility model discloses test fixture use as follows:
(1) and processing the sample according to the drawing requirements, and screwing the threaded section of the sample with the measured size into the assembled lower high-temperature clamp until the threaded section is not screwed.
(2) And (3) reversely loosening the external locking nut by one button, then continuously screwing the sample into the high-temperature clamp, and finally locking the external locking nut to ensure that the threaded end face of the sample props against the high-temperature ejector rod without a gap.
(3) And screwing the replaceable clamping block of the upper clamp into the threaded end part of the sample until the thread of the replaceable clamping block is exposed out of the threaded end part of the sample. The ejector pin of the upper clamp can be guaranteed to be capable of propping against the threaded end part of the sample.
(4) The upper clamp is installed without clearance with the fatigue testing machine and the outer lock nuts of the upper and lower clamps are tightened with the specimen preloaded less than the test load.
(5) And setting fatigue test parameters as required and starting a fatigue test.
The utility model discloses attention points when experimental anchor clamps use as follows:
1. it is required that the end face of the specimen be perpendicular to the parallel section.
2. During the installation of the test sample, the threaded end part is required to be exposed out of the threaded part of the replaceable clamping block and tightly connected with the ejector rod without clearance.
3. The clamp cannot be used in an environment containing corrosive media, and the use temperature cannot exceed 1000 ℃.
4. In the high-temperature test process, cooling water is used for cooling in the whole process to protect the clamp and the testing machine.
Make the utility model discloses after the high temperature tired anchor clamps, the clearance difficult problem that appears in the tired in-process of high temperature has been solved effectively to can dismantle screw thread anchor clamps's use can prolong high temperature anchor clamps's life. Practice proves that: compared with the traditional high-temperature clamp, the probability of the occurrence of gaps between the test sample and the clamp is reduced by more than 90% in the experimental process, the validity of test data is greatly improved, repeated tests are avoided, the problem of resource waste caused by repeated tests is reduced, and the use cost of the testing machine is reduced.
Claims (7)
1. The utility model provides a high temperature fatigue test anchor clamps which characterized in that: the test fixture comprises a base, an external locking nut, an outer sleeve, a mandril, an internal locking nut and a replaceable clamping block; wherein: the base is provided with a cylindrical boss, and the upper surface of the boss is provided with a mandril hole; the outer sleeve is arranged on the base, the outer sleeve is fixed with the boss of the base through an external locking nut, and the ejector rod extends into the outer sleeve; the upper end of the ejector rod is provided with a cylindrical boss, the upper part of the replaceable clamping block is used for screwing in a threaded end of a sample to be tested, and the lower part of the replaceable clamping block is sleeved on the cylindrical boss of the ejector rod; and after the lower end of the replaceable clamping block is sleeved at the upper end of the ejector rod, the replaceable clamping block is fixed on the outer sleeve through the inner locking nut.
2. The high temperature fatigue test fixture of claim 1, wherein: the side surface of the cylindrical boss is provided with external threads, the external locking nut is provided with internal threads, and the external locking nut and the cylindrical boss are in threaded fit to realize detachable connection; the outer side of the lower part of the outer sleeve is provided with an annular boss, and the upper part of the inner side of the outer locking nut is also provided with an annular boss; the annular boss on the inner side of the external locking nut is lapped on the annular boss on the outer side of the outer sleeve, so that the relative position of the external locking nut and the outer sleeve is fixed.
3. The high temperature fatigue test fixture of claim 1, wherein: the ejector rod extends into the outer sleeve, and the lower end face of the ejector rod extends into the ejector rod hole and is attached to the bottom face of the ejector rod hole.
4. The high temperature fatigue test fixture of claim 1, wherein: the replaceable clamping block is provided with an upper inner hole and a lower inner hole which are communicated, the upper inner hole is provided with internal threads and is used for screwing in a threaded end of a sample to be tested until the end part of the sample slightly extends out of the upper inner hole; the lower inner hole is sleeved on the cylindrical boss of the ejector rod; the diameter D1 of the upper inner hole of the replaceable clamping block is smaller than the diameter D2 of the lower inner hole, and the diameter of the cylindrical boss of the ejector rod is between D1 and D2.
5. The high temperature fatigue test fixture of claim 4, wherein: and the threaded end of the sample to be tested is screwed into the inner hole at the upper part of the replaceable clamping block and slightly extends out, and is attached to the upper end face of the cylindrical boss of the ejector rod.
6. The high temperature fatigue test fixture of claim 4, wherein: the upper part of the outer sleeve is provided with internal threads, an upper inner hole and a lower inner hole are formed in the inner locking nut, and the upper part of the inner locking nut is sleeved on the upper part of the replaceable clamping block; the lower part of the inner locking nut is provided with internal threads, and the upper part of the outer sleeve is detachably connected with the inner locking nut through thread matching.
7. The high temperature fatigue test fixture of claim 1, wherein: the test fixture is used in a matched mode, one test fixture is used for clamping the upper end of a sample, the other test fixture is used for clamping the lower end of the sample, after the test fixture is placed in a high-temperature furnace, an inner locking nut of the test fixture is located in the high-temperature furnace, an outer locking nut is located outside the high-temperature furnace, and the test fixture can be free of gaps between the sample and the test fixture by tightening the outer locking nut in the test process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922071266.6U CN211528045U (en) | 2019-11-27 | 2019-11-27 | High-temperature fatigue test fixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922071266.6U CN211528045U (en) | 2019-11-27 | 2019-11-27 | High-temperature fatigue test fixture |
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| CN211528045U true CN211528045U (en) | 2020-09-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323924A (en) * | 2021-12-16 | 2022-04-12 | 东风汽车集团股份有限公司 | Sample fatigue tension and compression loading test device and installation method |
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2019
- 2019-11-27 CN CN201922071266.6U patent/CN211528045U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114323924A (en) * | 2021-12-16 | 2022-04-12 | 东风汽车集团股份有限公司 | Sample fatigue tension and compression loading test device and installation method |
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