CN104198289A - Measuring device for four-point bending creep parameters and operating method - Google Patents

Measuring device for four-point bending creep parameters and operating method Download PDF

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Publication number
CN104198289A
CN104198289A CN201410473372.6A CN201410473372A CN104198289A CN 104198289 A CN104198289 A CN 104198289A CN 201410473372 A CN201410473372 A CN 201410473372A CN 104198289 A CN104198289 A CN 104198289A
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China
Prior art keywords
support bar
threaded rod
point bending
upper support
roll adjustment
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Withdrawn
Application number
CN201410473372.6A
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Chinese (zh)
Inventor
袁铁军
孟龙晖
张秀丽
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Yangcheng Institute of Technology
Yancheng Institute of Technology
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Yangcheng Institute of Technology
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Priority to CN201410473372.6A priority Critical patent/CN104198289A/en
Publication of CN104198289A publication Critical patent/CN104198289A/en
Withdrawn legal-status Critical Current

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Abstract

The invention discloses a measuring device for four-point bending creep parameters and an operating method of the measuring device. The measuring device comprises a frame body (1) and a lower cover (2) mounted at the bottom of the frame body (1), wherein a lower supporting rod moving chute (3) is formed in the lower surface of the frame body (1); two lower supporting rods (4) are mounted in the lower supporting rod moving chute (3); a laser displacement sensor (5) is mounted between the two lower supporting rods (4); a lower distance adjusting threaded rod (6) is mounted between the bottom of the frame body (1) and the lower cover (2); internal threads are formed in the bottom of each lower supporting rod (4); each lower supporting rod (4) is matched with the lower pitch adjusting threaded rod (6) through the internal threads formed in the bottom; internal threads are formed in the bottoms of two upper supporting rods (10); the upper supporting rods (10) are matched with an upper distance adjusting threaded rod (12) through internal threads formed in the top, fixed in an upper frame body (1) and are sealed for protection through an upper cover (13). The measuring device provided by the invention has the advantages of reasonable structural design, good convenience for operation and accurate measurement result.

Description

A kind of four-point bending creep parameters measurement mechanism and method of operating
Technical field
The present invention relates to creep parameters fields of measurement, specifically a kind of four-point bending creep parameters measurement mechanism and method of operating thereof.
Background technology
At industrial numerous areas, equipment is in complicated, severe working environment, and it involves great expense, and in whole production run, its effect is irreplaceable.Once equipment stops because accident is unplanned, may cause heavy losses.And creep rupture is a kind of very important form of destroying under high temperature, high-stress state.Accurate measurement to equipment creep parameters, can greatly reduce because the loss that equipment causes because of creep rupture.
At traditional uniaxial tension creep test, adopt standard sample to obtain the creep parameters of material, often need lot of materials, draw materials in a large number and also can bring destruction to original equipment, affect the normal operation of equipment simultaneously.And sometimes also can cannot meet the requirement of traditional performance test to specimen size because materialsed volume is too little in some small device reliability experiment, and cause experiment to carry out.
In the check and life appraisal of commercial unit material property, to adopt as far as possible on the one hand harmless or half method of damaging detection, must obtain to greatest extent again on the other hand the mechanical property of material, microminiature sample is the effective ways that solve this double-barreled question.That study the earliest the method is Dom and Niebuhr.The theoretical research work of bending creep test has obtained many progress so far, carrys out microstructure and the mechanical property of research material by different experiments parameter, but it is rare at present from the data obtained, directly to obtain the method for material creep parameter.Not very few by the document of four-point bending experiment measuring material creep parameter abroad at present, for the explanation of its principle and the derivation of formula, be close to very perfect, but on measurement mechanism and for there being a very perfect device, its device adopting is all often simple original, for zero and do not consider that the friction meeting between the strong point and tested part causes more serious impact to experiment, for the proportionate relationship between the strong point, also cannot regulate flexibly and easily, and the measurement changing for part amount of deflection does not propose feasible effective measures yet, make a general survey of the deficiency of current the party's surface technology, be badly in need of the croop property of an effective and feasible four-point bending measurement device material.
Summary of the invention
Goal of the invention: the object of the invention is, in order to solve the deficiencies in the prior art, provides a kind of reasonable in design, and easy to operate, measurement result is four-point bending creep parameters measurement mechanism accurately.Another object of the present invention is to provide the method for operating of this device.
Technical scheme: in order to realize above object, the technical scheme that the present invention takes is:
A kind of four-point bending creep parameters measurement mechanism, it is characterized in that: comprise framework, be arranged on the lower cover of framework bottom, on framework lower surface, offer lower support bar shifting chute, two lower support bars are installed on lower support bar shifting chute, between two lower support bars, laser displacement sensor are installed; Between described framework bottom and lower cover, lower roll adjustment threaded rod is installed, lower support bar bottom is provided with internal thread, and lower support bar is adaptive by internal thread and the lower roll adjustment threaded rod screw thread of bottom;
On described framework upper surface, offer pilot hole and upper support rod member shifting chute, location protruded object and upper support bar are inserted in respectively in pilot hole and upper support rod member shifting chute, described protruded object upper end, location is connected on upper frame, upper support bar upper end is positioned at upper frame, described upper support bar top is provided with internal thread, and upper support bar is adaptive by internal thread and upper roll adjustment threaded rod screw thread; On described upper frame, upper cover is installed;
Described laser displacement sensor is connected with computing machine.
As preferred version, above-described four-point bending creep parameters measurement mechanism, upper support bar is two.
As preferred version, above-described four-point bending creep parameters measurement mechanism, described upper support bar bottom is provided with rolling bearing.The method replacement that the present invention adopts rolling bearing contact with part at strong point place to support direct contact support in the past, can reduce the impact that the friction force of contact site is brought greatly.
As preferred version, above-described four-point bending creep parameters measurement mechanism, described lower support bar top is provided with rolling bearing.The method replacement that the present invention adopts rolling bearing contact with part at strong point place to support direct contact support in the past, can reduce the impact that the friction force of contact site is brought greatly.
As preferred version, above-described four-point bending creep parameters measurement mechanism, described lower roll adjustment threaded rod and the screw thread of upper roll adjustment threaded rod are divided into two sections, are respectively dextrorotation screw thread and derotation screw thread.In rotating the process of upper and lower roll adjustment threaded rod, two upper or lower support bars can be to moving symmetrically in the opposite direction, and making between the strong point of tested part is symmetrical all the time, meets the condition of four-point bending experiment.
The method of operating of four-point bending creep parameters measurement mechanism of the present invention, it comprises the following steps:
1), first according to the physical length of part, the lower roll adjustment threaded rod of rotation, adjusts the distance between two lower support bars;
2) part is placed on two lower support bars, and guarantees that the length direction of part and the length direction of framework have the good depth of parallelism;
3) location protruded object and upper support bar are inserted in respectively in pilot hole and upper support rod member shifting chute, upper support bar is contacted with part upper surface;
4) by rotation, go up roll adjustment threaded rod as required and regulate the distance between two upper support bars, make the ratio of the distance between final four strong points meet experiment needs;
5) upper, cover as required, place the weight consistent with upper cover length and width,
6) laser displacement sensor is fixed on to base of frame, and it is equated with the distance between two lower support bars, laser displacement sensor is connected with computing machine, in order to record the variation of part its amount of deflection in stressed crooked generation creep process, can obtain the time dependent process of workpiece for measurement bending creep.
Beneficial effect: compared to the prior art, the present invention has the following advantages:
Four-point bending creep parameters measurement mechanism provided by the invention can be as required, reasonable in design, and easy to operate, measurement result is accurate.The present invention can be conveniently to upper, the i.e. support ratio of distance between lower support point regulates easily, only need rotation roll adjustment threaded rod can realize support bar symmetrical mobile, by the top at support bar, rolling bearing is installed, with rolling bearing, contacting the method supporting with part replaces direct contact in the past to support, can greatly reduce the impact that the friction force of contact site is brought, in the base of frame of part, fix a laser displacement sensor, by computer apart from part amount of deflection over time, finally can be in the hope of the creep parameters of part material therefor according to experimental data.
Accompanying drawing explanation
Fig. 1 is the structural representation of four-point bending creep parameters measurement mechanism of the present invention;
Fig. 2 is that roll adjustment threaded rod regulates upper support bar apart from schematic diagram;
Fig. 3 is the structural representation of framework;
Fig. 4 is the structural representation of lower cover;
Fig. 5 is the structural representation of upper support bar;
Fig. 6 is the structural representation of upper cover;
Fig. 7 is the structural representation of lower support bar.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figures 1 to 7, a kind of four-point bending creep parameters measurement mechanism, it comprises framework (1), be arranged on the lower cover (2) of framework (1) bottom, on framework (1) lower surface, offer lower support bar shifting chute (3), two lower support bars (4) are installed on lower support bar shifting chute (3), laser displacement sensor (5) is installed between two lower support bars (4); Between described framework (1) bottom and lower cover (2), lower roll adjustment threaded rod (6) is installed, lower support bar (4) bottom is provided with internal thread, and lower support bar (4) is adaptive by internal thread and lower roll adjustment threaded rod (6) screw thread of bottom;
On described framework (1) upper surface, offer pilot hole (7) and two upper support rod member shifting chutes (8), location protruded object (9) and 2 upper support bars (10) are inserted in respectively in pilot hole (7) and upper support rod member shifting chute (8), described location protruded object (9) upper end is connected on upper frame (11), upper support bar (10) upper end is positioned at upper frame (11), described upper support bar (10) top is provided with internal thread, and upper support bar (10) is adaptive by internal thread and upper roll adjustment threaded rod (12) screw thread; Upper cover (13) is installed on described upper frame (11); Described laser displacement sensor (5) is connected with computing machine (14).
Above-described four-point bending creep parameters measurement mechanism, described upper support bar (10) bottom is provided with rolling bearing (15).Described lower support bar (4) top is provided with rolling bearing (16).
Above-described four-point bending creep parameters measurement mechanism, described lower roll adjustment threaded rod (6) and the screw thread of upper roll adjustment threaded rod (12) are divided into two sections, are respectively dextrorotation screw thread and derotation screw thread.
A method of operating for four-point bending creep parameters measurement mechanism, it comprises the following steps:
1), first according to the physical length of part (17), the lower roll adjustment threaded rod (6) of rotation, adjusts the distance between two lower support bars (4);
2) part (17) is placed in to two lower support bars (4) above, and guarantees that the length direction of part (17) and the length direction of framework (1) have the good depth of parallelism;
3) will locate protruded object (9) and upper support bar (10) and be inserted in respectively in pilot hole (7) and upper support rod member shifting chute (8), upper support bar (10) is contacted with part (17) upper surface;
4) by rotation, go up roll adjustment threaded rod (12) as required and regulate the distance between two upper support bars (10), make the ratio of the distance between final four strong points meet experiment needs;
5) upper at upper cover (13) as required, place the weight consistent with upper cover (13) length and width,
6) laser displacement sensor (5) is fixed on to base of frame, and it is equated with the distance between two lower support bars (4), laser displacement sensor (5) is connected with computing machine (14), in order to record the variation of part its amount of deflection in stressed crooked generation creep process, can obtain the time dependent process of workpiece for measurement bending creep.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make some improvement under the premise without departing from the principles of the invention, and these improvement also should be considered as protection scope of the present invention.

Claims (6)

1. a four-point bending creep parameters measurement mechanism, it is characterized in that: comprise framework (1), be arranged on the lower cover (2) of framework (1) bottom, on framework (1) lower surface, offer lower support bar shifting chute (3), two lower support bars (4) are installed on lower support bar shifting chute (3), laser displacement sensor (5) is installed between two lower support bars (4); Between described framework (1) bottom and lower cover (2), lower roll adjustment threaded rod (6) is installed, lower support bar (4) bottom is provided with internal thread, and lower support bar (4) is adaptive by internal thread and lower roll adjustment threaded rod (6) screw thread of bottom; On described framework (1) upper surface, offer pilot hole (7) and upper support rod member shifting chute (8), location protruded object (9) and upper support bar (10) are inserted in respectively in pilot hole (7) and upper support rod member shifting chute (8), described location protruded object (9) upper end is connected on upper frame (11), upper support bar (10) upper end is positioned at upper frame (11), described upper support bar (10) top is provided with internal thread, and upper support bar (10) is adaptive by internal thread and upper roll adjustment threaded rod (12) screw thread; Upper cover (13) is installed on described upper frame (11); Described laser displacement sensor (5) is connected with computing machine (14).
2. four-point bending creep parameters measurement mechanism according to claim 1, is characterized in that: upper support bar (10) is two.
3. four-point bending creep parameters measurement mechanism according to claim 1, is characterized in that: described upper support bar (10) bottom is provided with rolling bearing (15).
4. according to the four-point bending creep parameters measurement mechanism described in claims 1 to 3 any one, it is characterized in that: described lower support bar (4) top is provided with rolling bearing (16).
5. four-point bending creep parameters measurement mechanism according to claim 4, is characterized in that: described lower roll adjustment threaded rod (6) and the screw thread of upper roll adjustment threaded rod (12) are divided into two sections, are respectively dextrorotation screw thread and derotation screw thread.
6. a method of operating for four-point bending creep parameters measurement mechanism, is characterized in that comprising the following steps:
1), first according to the physical length of part, the lower roll adjustment threaded rod (6) of rotation, adjusts the distance between two lower support bars (4);
2) part is placed in to two lower support bars (4) above, and guarantees that the length direction of part and the length direction of framework (1) have the good depth of parallelism;
3) will locate protruded object (9) and upper support bar (10) and be inserted in respectively in pilot hole (7) and upper support rod member shifting chute (8), upper support bar (10) is contacted with part upper surface;
4) by rotation, go up roll adjustment threaded rod (12) as required and regulate the distance between two upper support bars (10), make the ratio of the distance between final four strong points meet experiment needs;
5) upper at upper cover (13) as required, place the weight consistent with upper cover (13) length and width,
6) laser displacement sensor (5) is fixed on to base of frame, and it is equated with the distance between two lower support bars (4), laser displacement sensor (5) is connected with computing machine (14), in order to record the variation of part its amount of deflection in stressed crooked generation creep process, can obtain the time dependent process of workpiece for measurement bending creep.
CN201410473372.6A 2014-09-16 2014-09-16 Measuring device for four-point bending creep parameters and operating method Withdrawn CN104198289A (en)

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Application Number Priority Date Filing Date Title
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CN104897481A (en) * 2015-06-12 2015-09-09 攀钢集团攀枝花钢铁研究院有限公司 Curve detection device and detection method
CN105424502A (en) * 2016-01-05 2016-03-23 天津大学 Large-deformation pipeline circumferential weld bending tester and method thereof
CN105954103A (en) * 2016-06-23 2016-09-21 长沙理工大学 Device and method for synchronously testing stretching, compression and bend-stretching rebound moduli of pavement material
CN107179234A (en) * 2017-07-26 2017-09-19 林继承 A kind of concrete Intensity of Breaking Tester
CN107831067A (en) * 2017-10-31 2018-03-23 河南理工大学 A kind of variable Three Point Bending Creep Test method of rock
CN108344642A (en) * 2018-02-02 2018-07-31 中国工程物理研究院机械制造工艺研究所 It is a kind of based on gravitational load 3 points of curved creep test devices and test method
CN111023962A (en) * 2019-11-20 2020-04-17 北京航天控制仪器研究所 Four-point bending moment beam type strain sensor calibration equipment
CN113514319A (en) * 2021-05-10 2021-10-19 吉林大学 In-situ static-dynamic fatigue mechanical property testing instrument in scanning electron microscope
CN114509336A (en) * 2021-12-27 2022-05-17 中国北方发动机研究所(天津) Adjustable hard brittle material surface stress loading device

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104897481B (en) * 2015-06-12 2018-07-10 攀钢集团攀枝花钢铁研究院有限公司 Bending detection device and detection method
CN104897481A (en) * 2015-06-12 2015-09-09 攀钢集团攀枝花钢铁研究院有限公司 Curve detection device and detection method
CN105424502A (en) * 2016-01-05 2016-03-23 天津大学 Large-deformation pipeline circumferential weld bending tester and method thereof
CN105954103A (en) * 2016-06-23 2016-09-21 长沙理工大学 Device and method for synchronously testing stretching, compression and bend-stretching rebound moduli of pavement material
CN105954103B (en) * 2016-06-23 2018-09-11 长沙理工大学 Ground surface material stretching, compression, curved drawing modulus of resilience synchronous testing device and method
CN107179234B (en) * 2017-07-26 2019-06-07 广东丰业电力器材有限公司 A kind of concrete Intensity of Breaking Tester
CN107179234A (en) * 2017-07-26 2017-09-19 林继承 A kind of concrete Intensity of Breaking Tester
CN107831067A (en) * 2017-10-31 2018-03-23 河南理工大学 A kind of variable Three Point Bending Creep Test method of rock
CN108344642A (en) * 2018-02-02 2018-07-31 中国工程物理研究院机械制造工艺研究所 It is a kind of based on gravitational load 3 points of curved creep test devices and test method
CN108344642B (en) * 2018-02-02 2020-07-10 中国工程物理研究院机械制造工艺研究所 Creep experiment device based on gravity loading three-point bending and testing method
CN111023962A (en) * 2019-11-20 2020-04-17 北京航天控制仪器研究所 Four-point bending moment beam type strain sensor calibration equipment
CN113514319A (en) * 2021-05-10 2021-10-19 吉林大学 In-situ static-dynamic fatigue mechanical property testing instrument in scanning electron microscope
CN114509336A (en) * 2021-12-27 2022-05-17 中国北方发动机研究所(天津) Adjustable hard brittle material surface stress loading device

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Application publication date: 20141210