CN108844810A - A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube - Google Patents
A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube Download PDFInfo
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- CN108844810A CN108844810A CN201810533172.3A CN201810533172A CN108844810A CN 108844810 A CN108844810 A CN 108844810A CN 201810533172 A CN201810533172 A CN 201810533172A CN 108844810 A CN108844810 A CN 108844810A
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- 239000002184 metal Substances 0.000 title claims abstract description 65
- 238000012360 testing method Methods 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000003904 radioactive pollution Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0274—Tubular or ring-shaped specimens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of full pipe sample stress-rupture tester fixtures of small diameter metal thin-wall tube, the clamping when fixture is for realizing pipe sample stress-rupture tester complete to small diameter metal thin-wall tube.The fixture includes outer fixture and interior fixture, and outer fixture includes adapter ontology, binding nut, preceding cutting ferrule, rear cutting ferrule, adapter external screw thread, connection screw thread, and interior fixture includes mandrel rod and axle sleeve.So that thin-wall tube sample is recessed inwardly by cutting ferrule before and after metal when use, realize the outer clamping to tubing, the interior clamping to tubing is realized by mandrel rod and axle sleeve cooperation.It is compared with the prior art, the present invention had both improved the aid power to sample in the way of inside and outside clamping, while in turn avoiding damage of the processing screw thread to sample.And it is ingenious in design, it is simple to operate, it can be installed on the common various Stress-repture testers in laboratory, low in cost, test result is accurate.
Description
Technical Field
The invention belongs to the field of metal material test research, and particularly relates to a full-tube high-temperature endurance test fixture for a small-caliber metal thin-wall tube.
Background
The metal high temperature proof strength test is a mechanical property test of a material that measures the maximum stress that does not cause fracture for a specified duration when the material is subjected to a constant load at a certain temperature. The high-temperature durable strength provides important basis for the design and material selection of the high-temperature component. Conventional high temperature permanent strength tests use standard permanent test specimens (e.g. bar specimens, plate specimens as given in GB/T2039-2012, ASTM E139). It is feasible to use this sample pattern for larger sized materials.
The small-caliber metal thin-wall pipe component is widely applied to key parts of nuclear power and thermal power, such as a steam generator heat transfer pipe and the like, the high-temperature service performance of the small-caliber metal thin-wall pipe component directly influences the safe operation, and once an accident occurs, radioactive pollution can be caused, and the environmental safety is threatened. Testing the durability of thin-walled tube materials is therefore very important to ensure the safety of these parts.
The small-caliber metal thin-wall pipe member cannot directly process a standard sample due to the thin wall thickness, and the current commonly used methods comprise two methods: a method is characterized in that a thin-wall pipe is thrown open in a center and processed into a flat boat-shaped sample, and then a relevant clamp is designed to carry out a high-temperature mechanical property test (see Chinese patents: 201320175058.0, 200810167020.2 and 201110230495.3). The other method is to adopt a whole-section tube thin-wall sample, and usually, an inner plug head which is inserted directly is matched with a lock nut on the outer side of the sample to provide clamping force, but the inner plug head cannot be tightly attached to the inner wall of the tubular sample, so that the clamp of the type has the problem of insufficient clamping force, the sample is damaged by processing external threads, stress is easily concentrated at the external threads, and the sample is possibly broken at the external threads, so that the test failure is caused. In addition, when the thin-walled metal sample tube wall is thin, the outer thread cannot be machined, so that the method is not feasible.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a full-tube high-temperature endurance test clamp for a small-caliber metal thin-wall tube.
The invention is realized by adopting the following technical scheme:
a whole-tube high-temperature endurance test fixture for a small-caliber metal thin-wall tube comprises an outer fixture and an inner fixture; wherein,
one end of the outer clamp is provided with a connecting thread, the other end of the outer clamp is an adapter body, an adapter external thread is processed on the adapter body, and the outer clamp further comprises a clamping sleeve and a clamping nut connected with the adapter through the thread;
the inner clamp comprises a shaft rod and a shaft sleeve, wherein the upper part of the shaft rod is provided with a fixing nut, the middle part of the shaft rod is provided with an external thread, and the lower part of the shaft rod is of a cone structure; the upper end of the shaft sleeve is provided with double shaft shoulders, and the lower end is provided with a symmetrical six-petal inner cone sleeve;
when in use, the external clamp is clamped in the following way: the adapter body and the clamping sleeve are sleeved on the outer side of the small-caliber metal thin-wall pipe sample, and when the clamping nut is screwed, the clamping sleeve is pushed into a gap between the adapter body and the small-caliber metal thin-wall pipe sample, so that the small-caliber metal thin-wall pipe sample is inwards sunken to form clamping; the clamping mode of the inner clamp is as follows: the inner clamp is sleeved on the inner side of the small-caliber metal thin-wall pipe sample, the fixing nut is screwed, and the inner clamping of the small-caliber metal thin-wall pipe sample is realized through the matching of the cone structure and the six-petal inner cone sleeve.
The invention has the further improvement that the clamping sleeve comprises a front clamping sleeve and a rear clamping sleeve, when the outer clamp is clamped, and the clamping nut is screwed, the front clamping sleeve is pushed into a gap between the adapter body and the small-caliber metal thin-wall pipe sample, so that the small-caliber metal thin-wall pipe sample is sunken inwards to form primary clamping, and the rear clamping sleeve is pushed into a gap between the front clamping sleeve and the small-caliber metal thin-wall pipe sample, so that the small-caliber metal thin-wall pipe sample is sunken inwards to form secondary clamping.
The invention has the further improvement that the hardness of the materials of the front cutting sleeve and the rear cutting sleeve is higher than that of the small-caliber metal thin-wall pipe sample, so that the front cutting sleeve and the rear cutting sleeve are not deformed and the small-caliber metal thin-wall pipe sample is inwards sunken when the front cutting sleeve and the rear cutting sleeve are clamped.
The invention has the further improvement that when the small-caliber metal thin-wall pipe is subjected to a full-pipe-sample high-temperature endurance test, the outer clamp and the inner clamp are matched to form an upper clamp and a lower clamp respectively.
The invention has the further improvement that the upper clamp and the lower clamp are respectively in threaded connection with the upper connecting screw rod of the endurance testing machine and the lower connecting screw rod of the endurance testing machine through connecting threads.
The invention is further improved in that the main body of the small-caliber metal thin-wall pipe sample is arranged in a heating electric furnace of a endurance testing machine in a use state.
The invention has the following beneficial technical effects:
the invention provides a small-caliber metal thin-wall tube full-tube-sample high-temperature endurance test fixture which comprises an outer fixture and an inner fixture, wherein the outer fixture is arranged on the inner side of the inner fixture; the outer clamp comprises an adapter body, a clamping nut, a front clamping sleeve, a rear clamping sleeve, an adapter external thread and a connecting thread; the inner clamp comprises a shaft rod and a shaft sleeve; wherein: the upper end of the shaft rod is provided with a fixed nut, the middle part of the shaft rod is provided with an external thread, and the lower part of the shaft rod is of a cone structure; the upper end of the shaft sleeve is provided with double shaft shoulders, and the lower end of the shaft sleeve is provided with a symmetrical six-petal inner cone sleeve; when the outer clamp is used for clamping, and the clamping nut is screwed, the clamping sleeve is pushed into a gap between the adapter body and the small-caliber metal thin-walled tube sample, so that the small-caliber metal thin-walled tube sample is inwards sunken to form clamping; when the inner clamp is clamped, the fixing nut is screwed, and the inner clamp of the pipe is realized through the matching between the cone structure and the six-petal inner cone sleeve.
Further, the clamping sleeve is provided with a front clamping sleeve and a rear clamping sleeve, when the clamping nut is screwed, the front clamping sleeve is pushed into a gap between the adapter body and the small-caliber metal thin-wall pipe sample, so that the small-caliber metal thin-wall pipe sample is sunken inwards to form primary clamping, and the rear clamping sleeve is pushed into a gap between the front clamping sleeve and the small-caliber metal thin-wall pipe sample, so that the small-caliber metal thin-wall pipe sample is sunken inwards to form secondary clamping.
Further, when a small-caliber metal thin-walled tube full-tube-sample high-temperature endurance test is carried out, the outer clamp and the inner clamp are matched to form a set of upper clamp and a set of lower clamp, and the lower clamp and the upper clamp are identical in structure.
In summary, the present invention has the following advantages:
1. the invention can realize the high-temperature endurance test of the whole section of the small-caliber metal thin-wall tube, has good centering performance of the sample, avoids the error of the test result of the traditional flat boat-shaped sample and ensures that the high-temperature endurance strength result is more accurate and reliable.
2. The invention designs the inner clamp to replace the traditional direct-insertion inner plug head, ensures that the inner clamp is tightly attached to the inner wall of the tubular sample, and improves the clamping force on the inner wall of the tubular sample.
3. The invention designs the external clamp to replace the traditional external thread structure, and utilizes the two metal clamping sleeves to clamp the tubular sample twice, thereby not only ensuring the clamping force on the outer wall of the tubular sample, but also not damaging the sample and avoiding the sample from being broken at the clamping position of the clamp.
4. The invention has the advantages of ingenious design, simple and convenient operation, wide application range and capability of being installed on various common high-temperature endurance testing machines in laboratories.
Drawings
FIG. 1 is an axial cross-sectional view of a fixture of the present invention.
FIG. 2 is an installation schematic diagram of the high-temperature endurance test fixture for the small-caliber metal thin-wall tube sample.
Wherein: 1 is an outer clamp; 11 is an adapter body; 12 is a clamping nut; 13 is a front ferrule; 14 is a rear ferrule; 15 is an external thread of the adapter; 16 is connecting screw thread; 2 is an inner clamp; 21 is a mandrel; 211 is a fixing nut; 212 is an external thread of the mandrel; 213 is a cone structure; 22 is a shaft sleeve; 221 is a double shaft shoulder; 222 is a symmetrical six-lobe inner cone sleeve; 3 is a small-caliber metal thin-wall pipe sample; 4, an upper clamp; 5 is a lower clamp; 6, a screw rod is connected on the endurance testing machine; 7 is a connecting screw rod under the endurance testing machine; and 8, a heating electric furnace of the endurance testing machine.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the invention provides a small-caliber metal thin-walled tube full-tube-like high-temperature endurance test fixture, which comprises an outer fixture 1 and an inner fixture 2; the outer clamp comprises an adapter body 11, a clamping nut 12, a front clamping sleeve 13, a rear clamping sleeve 14, an adapter external thread 15 and a connecting thread 16; the inner clamp 2 specifically comprises a mandrel 21 and a shaft sleeve 22. Wherein: the upper end of the shaft rod 21 is provided with a fixed nut 211, the middle part is provided with an external thread 212, and the lower part is a cone structure 213; the upper end of the shaft sleeve 22 is provided with a double shaft shoulder 221, and the lower end is provided with a symmetrical six-petal inner cone sleeve 222.
The specific installation steps are as follows:
firstly, the mandrel bar 21 is installed inside the shaft sleeve 22, the mandrel bar and the shaft sleeve are together penetrated inside the small-caliber metal thin-wall tube sample 3, the double shaft shoulders 221 at the upper end of the shaft sleeve 22 are clamped on the end face of the sample, the fixing nut 211 is screwed, and the tube is clamped inside through the matching between the cone structure 213 and the six-petal inner cone sleeve 222. The inner clamp 2 is ensured to be tightly attached to the inner wall of the tubular sample 3.
The clamping nut 12, the rear clamping sleeve 14 and the front clamping sleeve 13 are sequentially sleeved on the tubular sample 3, then the tubular sample 3 is inserted into a preformed hole of the adapter body 11, the relative positions of the clamping nut 12, the rear clamping sleeve 14, the front clamping sleeve 13 and the adapter body 11 are adjusted, the clamping nut 12 is screwed down, the front clamping sleeve 13 is pushed into a gap between the adapter body 11 and the small-caliber metal thin-wall pipe sample 3, the small-caliber metal thin-wall pipe sample 3 is enabled to be sunken inwards to form primary clamping, and then the clamping sleeve 14 is pushed into a gap between the front clamping sleeve 13 and the small-caliber metal thin-wall pipe sample 3, the small-caliber metal thin-wall pipe sample 3 is enabled to be sunken inwards to form secondary clamping.
The outer clamp 1 and the inner clamp 2 are matched to form a sleeve clamp 4, and the lower clamp 5 and the upper clamp 4 have the same structure.
One end of the upper clamp 4 is in threaded connection with an upper connecting screw rod 6 of the endurance testing machine, and one end of the lower clamp 5 is in threaded connection with a lower connecting screw rod 7 of the endurance testing machine.
The device is ingenious in design and simple and convenient to operate, can be mounted on various common high-temperature endurance testing machines in a laboratory, and can clamp the tubular sample when the high-temperature endurance test of the small-caliber metal thin-wall pipe section sample is carried out.
Claims (6)
1. The full-tube high-temperature endurance test fixture for the small-caliber metal thin-wall tube is characterized by comprising an outer fixture (1) and an inner fixture (2); wherein,
one end of the outer clamp (1) is provided with a connecting thread (16), the other end of the outer clamp is provided with an adapter body (11), an adapter external thread (15) is arranged on the adapter body (11), and the outer clamp also comprises a clamping sleeve and a clamping nut (12) which is connected with the adapter by the thread;
the inner clamp (2) comprises a shaft rod (21) and a shaft sleeve (22), wherein the upper part of the shaft rod (21) is provided with a fixed nut (211), the middle part of the shaft rod is provided with an external thread (212), and the lower part of the shaft rod is of a cone structure (213); the upper end of the shaft sleeve (22) is provided with a double shaft shoulder (221), and the lower end is provided with a symmetrical six-petal inner cone sleeve (222);
when in use, the clamping mode of the outer clamp (1) is as follows: the adapter body (11) and the clamping sleeve are sleeved on the outer side of the small-caliber metal thin-wall pipe sample (3), and when the clamping nut (12) is screwed, the clamping sleeve is pushed into a gap between the adapter body (11) and the small-caliber metal thin-wall pipe sample (3), so that the small-caliber metal thin-wall pipe sample (3) is sunken inwards to form clamping; the clamping mode of the inner clamp (2) is as follows: the inner clamp (2) is sleeved on the inner side of the small-caliber metal thin-wall pipe sample (3), the fixing nut (211) is screwed, and the inner clamping of the small-caliber metal thin-wall pipe sample (3) is realized through the matching between the cone structure (213) and the six-petal inner cone sleeve (222).
2. The clamp for the whole-tube high-temperature endurance test of the small-caliber metal thin-wall tube according to claim 1, wherein the clamp sleeve comprises a front clamp sleeve (13) and a rear clamp sleeve (14), when the outer clamp (1) is clamped and the clamping nut (12) is screwed, the front clamp sleeve (13) is pushed into a gap between the adapter body (11) and the small-caliber metal thin-wall tube sample (3), so that the small-caliber metal thin-wall tube sample (3) is recessed inwards to form primary clamping, and the rear clamp sleeve (14) is pushed into a gap between the front clamp sleeve (13) and the small-caliber metal thin-wall tube sample (3), so that the small-caliber metal thin-wall tube sample (3) is recessed inwards to form secondary clamping.
3. The clamp for the whole-tube high-temperature endurance test of the small-caliber metal thin-wall tube according to claim 2, wherein the hardness of the materials of the front cutting sleeve (13) and the rear cutting sleeve (14) is higher than that of the small-caliber metal thin-wall tube sample (3), so that the front cutting sleeve (13) and the rear cutting sleeve (14) are not deformed and the small-caliber metal thin-wall tube sample (3) is inwards recessed when the small-caliber metal thin-wall tube sample is clamped externally.
4. The clamp for the whole-tube high-temperature endurance test of the small-caliber metal thin-wall tube according to claim 1, wherein during the whole-tube high-temperature endurance test of the small-caliber metal thin-wall tube, the outer clamp (1) and the inner clamp (2) are used in a matched manner to respectively form an upper clamp (4) and a lower clamp (5).
5. The clamp for the whole-tube high-temperature endurance test of the small-caliber metal thin-walled tube according to claim 4, wherein the upper clamp (4) and the lower clamp (5) are in threaded connection with an upper connection screw (6) of the endurance test machine and a lower connection screw (7) of the endurance test machine through connection threads (16), respectively.
6. The clamp for the whole-tube high-temperature endurance test of the small-caliber metal thin-wall tube according to claim 1, wherein in the use state, the main body of the small-caliber metal thin-wall tube sample (3) is arranged in a heating electric furnace of an endurance test machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810533172.3A CN108844810A (en) | 2018-05-29 | 2018-05-29 | A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810533172.3A CN108844810A (en) | 2018-05-29 | 2018-05-29 | A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube |
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| CN108844810A true CN108844810A (en) | 2018-11-20 |
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|---|---|---|---|
| CN201810533172.3A Pending CN108844810A (en) | 2018-05-29 | 2018-05-29 | A kind of full pipe sample stress-rupture tester fixture of small diameter metal thin-wall tube |
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| CN (1) | CN108844810A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111238969A (en) * | 2020-02-04 | 2020-06-05 | 中国石油大学(华东) | A fatigue test fixing device for combined material pipe |
| WO2021013116A1 (en) * | 2019-07-23 | 2021-01-28 | 西安热工研究院有限公司 | High-temperature and high-pressure water slow tensile stress corrosion test system for metal tube full-tube sample |
| CN112798432A (en) * | 2020-12-30 | 2021-05-14 | 中航试金石检测科技(大厂)有限公司 | Thin-wall pipe full-pipe test tool clamp and high-temperature creep endurance test equipment |
| CN115389312A (en) * | 2022-09-15 | 2022-11-25 | 上海航空材料结构检测股份有限公司 | Plate-shaped sample ultra-high temperature low-cycle fatigue test fixture, clamping device and test device |
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| CN112798432A (en) * | 2020-12-30 | 2021-05-14 | 中航试金石检测科技(大厂)有限公司 | Thin-wall pipe full-pipe test tool clamp and high-temperature creep endurance test equipment |
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| CN115389312A (en) * | 2022-09-15 | 2022-11-25 | 上海航空材料结构检测股份有限公司 | Plate-shaped sample ultra-high temperature low-cycle fatigue test fixture, clamping device and test device |
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Application publication date: 20181120 |