CN104020053A - Test device applicable to ultralow temperature reinforcing steel bar tensile test - Google Patents
Test device applicable to ultralow temperature reinforcing steel bar tensile test Download PDFInfo
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- CN104020053A CN104020053A CN201410272544.3A CN201410272544A CN104020053A CN 104020053 A CN104020053 A CN 104020053A CN 201410272544 A CN201410272544 A CN 201410272544A CN 104020053 A CN104020053 A CN 104020053A
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- screw thread
- reinforcing bar
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Abstract
The invention discloses a test device applicable to ultralow temperature reinforcing steel bar tensile test. The test device comprises a low temperature test box (1), a reinforcing steel bar test sample (2) and a clamp, wherein the clamp comprises an upper threaded clamp (3) and a lower threaded clamp (4), and the upper threaded clamp (3) and the lower threaded clamp (4) are respectively connected to one end of the reinforcing steel bar test sample (2) and fixed on the low temperature test box (1); one end, matched with the reinforcing steel bar test sample (2), of each of the upper threaded clamp (3) and the lower threaded clamp (4) is of a hollow bushing structure. According to the test device, the yield and the extreme strength of an upsetting part of the reinforcing steel bar test sample can be improved through the cold upsetting process, so that the real strength of a connector can be higher than the strength of a reinforcing steel bar test sample base material; meanwhile, the reinforcing steel bar test sample is clamped by the upper threaded clamp and the lower threaded clamp in a threading manner; moreover, as the test force is increased, the clamping force is also increased, so that the authenticity and reliability of data of the low temperature tensile test of the measured reinforcing steel bar test sample can be guaranteed.
Description
Technical field
The present invention relates to metal material cryogenic tensile test field, especially relate to the test unit of a kind of being applicable to-165 ℃ ultralow temperature steel bar stretching test.
Background technology
The low temperature reinforcing bar of resistance to-165 ℃ is widely used in the construction of LNG tank engineering, and supplier need provide the cryogenic tensile test findings of-165 ℃, and sample do not allow turning processing, consistent with mother metal to guarantee the tensile property of measuring.At present, steel bar stretching test General Requirements carries out under normal temperature environment, the design of normal temperature fixture, install comparatively simple, but need in low-temperature test chamber, carry out during cryogenic tensile, owing to being put to the test, machine stroke is limit, in cryogenic box fixture need that volume is little, holding force is large, low temperature resistant, so low temperature jig Design, difficulty is installed.In prior art, the applicable minimum temperature of low temperature fixture of reinforcing bar sample is-80 ℃, and reinforcing bar sample needs turning to be processed into the standard sample of band shoulder, structure as shown in Figure of description 1, the stretching result drawing like this can not truly reflect parent material of reinforcement rebar whole mechanical property at low temperatures.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of test unit that is applicable to the test of ultralow temperature steel bar stretching for problems of the prior art, its objective is in assurance and reinforcing bar sample is not carried out under the prerequisite of turning processing, reflection reinforcing bar sample is in authenticity, the accuracy of cryogenic stretching performance below-165 ℃.
Technical scheme of the present invention is that test unit that this kind is applicable to ultralow temperature steel bar stretching test comprises low-temperature test chamber, reinforcing bar sample and for reinforcing bar sample being fixed on to the fixture in low-temperature test chamber, described fixture comprises screw thread fixture and lower screw thread fixture, upper screw thread fixture and lower screw thread fixture be one end of connecting reinforcement sample respectively, and is fixed on low-temperature test chamber; One end that described upper screw thread fixture and lower screw thread fixture coordinate with reinforcing bar sample is hollow type tube-in-tube structure, and the other end of upper screw thread fixture is connected with universal tensile testing machine.
Described upper screw thread fixture and the sleeve position of lower screw thread fixture are provided with internal thread, and the two ends of reinforcing bar sample are respectively equipped with the external thread structure matching with sleeve inner female thread structure.
It is jumping-up structure that the two ends of described reinforcing bar sample process threaded position, and jumping-up position diameter is than at least large 2mm of diameter at position to be tested, reinforcing bar sample middle part.
External thread on described reinforcing bar sample is the straight thread structure that cut becomes on thread cutter for steel bar.
The test unit that this kind with said structure is applicable to the test of ultralow temperature steel bar stretching has the following advantages:
1. the test unit that this kind is applicable to the test of ultralow temperature steel bar stretching is by cold upsetting technique, expanded the cross-sectional area of reinforcing bar sample end, surrender and the ultimate strength of reinforcing bar sample jumping-up part are improved, thereby the actual strength of guaranteeing joint is higher than reinforcing bar sample strength of parent; Simultaneously, upper screw thread fixture and lower screw thread fixture clamp reinforcing bar sample by screw thread, and the increase along with test force, clamping force also increases thereupon, the data of the reinforcing bar sample cryogenic tensile test that assurance is measured are true, reliable, and under low temperature environment, can realize the tensile testing of Multi-example, many specifications, greatly save cost.
2. to be applicable to the test unit installation process of ultralow temperature steel bar stretching test simple for this kind, is swift in motion, and is difficult for skidding, easy to operate, safety labor-saving, and labour intensity that can the person of lightening one's labor, increases work efficiency.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is the structural representation of reinforcing bar sample in prior art.
Fig. 2 is structural representation of the present invention.
Fig. 3 goes up the structural representation of screw thread fixture and lower screw thread fixture in the present invention.
Fig. 4 is the structural representation of reinforcing bar sample in the present invention.
In Fig. 1-4,1: low-temperature test chamber; 2: reinforcing bar sample; 3: upper screw thread fixture; 4: lower screw thread fixture.
Embodiment
Fig. 1 is the structural representation of reinforcing bar sample in prior art, and Fig. 2 is structural representation of the present invention, and Fig. 3 goes up the structural representation of screw thread fixture and lower screw thread fixture in the present invention, and Fig. 4 is the structural representation of reinforcing bar sample in the present invention.From structure shown in Fig. 2-Fig. 4 in conjunction with, the test unit that this kind is applicable to ultralow temperature steel bar stretching test comprises low-temperature test chamber 1, reinforcing bar sample 2 and for reinforcing bar sample 2 is fixed on to the fixture in low-temperature test chamber 1, fixture comprises screw thread fixture 3 and lower screw thread fixture 4, upper screw thread fixture 3 and lower screw thread fixture 4 be one end of connecting reinforcement sample 2 respectively, and is fixed on low-temperature test chamber 1; One end that described upper screw thread fixture 3 and lower screw thread fixture 4 coordinate with reinforcing bar sample 2 is hollow type tube-in-tube structure, and the other end of upper screw thread fixture 3 is connected with universal tensile testing machine.
The sleeve position of upper screw thread fixture 3 and lower screw thread fixture 4 is provided with internal thread, the two ends of reinforcing bar sample 2 are respectively equipped with the external thread structure matching with sleeve inner female thread structure, and the external thread on reinforcing bar sample 2 is the straight thread structure that cut becomes on thread cutter for steel bar, and screw thread specification should be mated with the model of upper screw thread fixture 3 and lower screw thread fixture 4 sleeves.The processing of external thread on reinforcing bar sample 2 answer thread form full, without defects such as snaggletooth, bald teeth; It is jumping-up structure that the two ends of reinforcing bar sample 2 process threaded position, and jumping-up position diameter is than at least large 2mm of the diameter at reinforcing bar sample 2 positions to be tested, middle part.
Table 1 has been enumerated the specification of part reinforcing bar sample 2 and the size relationship of upset diameter and upsetting length:
| Bar gauge (φ mm) | Upset diameter (φ mm) | Upsetting length (mm) |
| 16 | 20 | 20 |
| 18 | 22 | 23 |
| 20 | 24 | 26 |
| 22 | 26 | 30 |
| 25 | 29 | 33 |
| 28 | 32 | 36 |
| 32 | 36 | 40 |
Below by specific embodiment and the test parameters obtained, the present invention is described, test figure can truly reflect that reinforcing bar is at the tensile property of-165 ℃.Cryogenic tensile test for low temperature reinforcing bar, test temperature-165 ℃, reinforcing bar sample specification is respectively φ 16,18,22,25, the 32mm in table 1, the tensile mechanical properties embodiment obtaining, in Table 2, can be used the reinforcing bar sample without turning processing to complete-165 ℃ of tension tests under ultralow temperature.
In table 2: the meaning that each parameter refers to please be described! R
p0.2(MPa) refer to: yield strength
R
m(MPa) refer to: tensile strength
A
gt(%) refer to: maximum, force downward-extension rate
Table 2: the tensile property of the embodiment of the present invention
This kind with said structure is applicable to the test unit of ultralow temperature steel bar stretching test by cold upsetting technique, expanded the cross-sectional area of reinforcing bar sample end, surrender and the ultimate strength of reinforcing bar sample jumping-up part are improved, thereby the actual strength of guaranteeing joint is higher than reinforcing bar sample strength of parent; Simultaneously, upper screw thread fixture and lower screw thread fixture clamp reinforcing bar sample by screw thread, and the increase along with test force, clamping force also increases thereupon, the data of the reinforcing bar sample cryogenic tensile test that assurance is measured are true, reliable, and under low temperature environment, can realize the tensile testing of Multi-example, many specifications, greatly save cost.
Claims (4)
1. be applicable to the test unit of ultralow temperature steel bar stretching test, it is characterized in that: described test unit comprises low-temperature test chamber (1), reinforcing bar sample (2) and for reinforcing bar sample (2) being fixed on to the fixture in low-temperature test chamber (1), described fixture comprises screw thread fixture (3) and lower screw thread fixture (4), upper screw thread fixture (3) and lower screw thread fixture (4) be one end of connecting reinforcement sample (2) respectively, and is fixed on low-temperature test chamber (1); One end that described upper screw thread fixture (3) and lower screw thread fixture (4) coordinate with reinforcing bar sample (2) is hollow type tube-in-tube structure, and the other end of upper screw thread fixture (3) is connected with universal tensile testing machine.
2. the test unit that is applicable to ultralow temperature steel bar stretching test according to claim 1, it is characterized in that: described upper screw thread fixture (3) and the sleeve position of lower screw thread fixture (4) are provided with internal thread, and the two ends of reinforcing bar sample (2) are respectively equipped with the external thread structure matching with sleeve inner female thread structure.
3. the test unit that is applicable to ultralow temperature steel bar stretching test according to claim 2, it is characterized in that: it is jumping-up structure that the two ends of described reinforcing bar sample (2) process threaded position, and jumping-up position diameter is than at least large 2mm of diameter at position to be tested, reinforcing bar sample (2) middle part.
4. according to the test unit that is applicable to the test of ultralow temperature steel bar stretching described in claim 2 or 3, it is characterized in that: the external thread on described reinforcing bar sample (2) is the straight thread structure that cut becomes on thread cutter for steel bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410272544.3A CN104020053A (en) | 2014-06-18 | 2014-06-18 | Test device applicable to ultralow temperature reinforcing steel bar tensile test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410272544.3A CN104020053A (en) | 2014-06-18 | 2014-06-18 | Test device applicable to ultralow temperature reinforcing steel bar tensile test |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613859A (en) * | 2015-02-05 | 2015-05-13 | 交通运输部公路科学研究所 | Electromagnetic sensing principle based inspection component of concrete reinforcement detector |
| CN104634668A (en) * | 2015-02-27 | 2015-05-20 | 马钢(集团)控股有限公司 | Device and method for testing fracture toughness of wheel steel under a series of temperature |
| CN105445103A (en) * | 2015-12-11 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Strength measuring method of threaded workpieces |
| CN114152508A (en) * | 2021-12-03 | 2022-03-08 | 内蒙古航天红岗机械有限公司 | Ultra-high strength steel tensile test tool |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102331374A (en) * | 2011-06-09 | 2012-01-25 | 振石集团东方特钢股份有限公司 | Low-temperature tensile test device for metal material |
| CN102645369A (en) * | 2012-04-27 | 2012-08-22 | 深圳市建筑科学研究院有限公司 | Low-temperature tensile test device |
| CN103175741A (en) * | 2013-03-18 | 2013-06-26 | 中国建筑股份有限公司 | Device and testing method for reinforcing steel bar tensile test in supper-low temperature environment |
| CN204008321U (en) * | 2014-06-18 | 2014-12-10 | 马钢(集团)控股有限公司 | A kind of test unit that is applicable to the test of ultralow temperature steel bar stretching |
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2014
- 2014-06-18 CN CN201410272544.3A patent/CN104020053A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331374A (en) * | 2011-06-09 | 2012-01-25 | 振石集团东方特钢股份有限公司 | Low-temperature tensile test device for metal material |
| CN102645369A (en) * | 2012-04-27 | 2012-08-22 | 深圳市建筑科学研究院有限公司 | Low-temperature tensile test device |
| CN103175741A (en) * | 2013-03-18 | 2013-06-26 | 中国建筑股份有限公司 | Device and testing method for reinforcing steel bar tensile test in supper-low temperature environment |
| CN204008321U (en) * | 2014-06-18 | 2014-12-10 | 马钢(集团)控股有限公司 | A kind of test unit that is applicable to the test of ultralow temperature steel bar stretching |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613859A (en) * | 2015-02-05 | 2015-05-13 | 交通运输部公路科学研究所 | Electromagnetic sensing principle based inspection component of concrete reinforcement detector |
| CN104634668A (en) * | 2015-02-27 | 2015-05-20 | 马钢(集团)控股有限公司 | Device and method for testing fracture toughness of wheel steel under a series of temperature |
| CN105445103A (en) * | 2015-12-11 | 2016-03-30 | 中国航空工业标准件制造有限责任公司 | Strength measuring method of threaded workpieces |
| CN105445103B (en) * | 2015-12-11 | 2018-08-21 | 中国航空工业标准件制造有限责任公司 | A kind of measurement method of screw element intensity |
| CN114152508A (en) * | 2021-12-03 | 2022-03-08 | 内蒙古航天红岗机械有限公司 | Ultra-high strength steel tensile test tool |
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Application publication date: 20140903 |