CN101776550A - Tensile test fixture used for tubular product sample - Google Patents
Tensile test fixture used for tubular product sample Download PDFInfo
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- CN101776550A CN101776550A CN201010106439A CN201010106439A CN101776550A CN 101776550 A CN101776550 A CN 101776550A CN 201010106439 A CN201010106439 A CN 201010106439A CN 201010106439 A CN201010106439 A CN 201010106439A CN 101776550 A CN101776550 A CN 101776550A
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Abstract
The invention discloses a tensile test fixture used for a tubular product sample, which comprises an integral fixture comprising two concave die fixtures, two concave die cushion blocks, two convex die fixtures and two convex die cushion blocks, an upper positioning plate and a lower positioning plate. The two convex die cushion blocks are respectively fixed on the mounting surfaces of the two convex die fixtures; and the two concave die cushion blocks are respectively fixed on the mounting surfaces of the two concave die fixtures, and the convex arc faces of the convex die cushion blocks and the concave arc faces of the concave die cushion blocks are matched to become a pair of fixtures. The upper positioning plate and the lower positioning plate are respectively fixed on the side surfaces of the two convex die fixtures. The tensile test fixture is connected and positioned with a testing machine by the flanges of the convex die fixtures and the flanges of the concave die fixtures. The invention can firmly fix the tubular product sample and avoids the performance change of a tubular product caused by the condition that both ends of the tubular product sample are flatly clamped, thereby obtaining the accurate tensile property of the tubular product and having the characteristics of simple structure and convenient and reliable use.
Description
Technical field
The present invention relates to metal pipe material plastic forming technology field, specifically is a kind of tensile test fixture that is used for tubular product sample.
Background technology
The crooked Accurate Shaping of thin walled pipe numerical control is the complex nonlinear process under the multiparameter coupling reciprocation, and the accuracy of tubing plasticity constitutive parameter is one of key factor that influences the crooked finite element numerical simulation quality of tubing numerical control.The plasticity constitutive parameter of thin-wall pipes is difficult to directly check in from handbook, even and also may there are differences the tubing plasticity constitutive parameter of the same trade mark, same specification, the forming property of material is subjected to the influence of shaping mode simultaneously.At present, mostly adopt the one directional tensile test method to determine the plasticity constitutive parameter of tubing, simple.
In the tension test national standard, the material mechanical parameters of tubing is carried out one directional tensile test by direct intercepting vertical arc sample of total wall thickness or whole pipeline section from tubing and is obtained.For large-sized heavy-wall tube, can guarantee that tubular product sample is in uniaxial stressed state and obtains constitutive relation accurately in tension test though carry out the homogeneous tube stretching, need big anchor clamps and very big hydraulic pressure, the test performance difficulty.Pipe thickness is greater than the vertical arc sample of the general employing of tubing of 0.5mm.Because most of hydraulic expanding-forming uses the wall thickness of tubing all greater than 0.5mm, therefore all will adopt vertical arc sample to carry out one directional tensile test.Because the two ends of arc sample are not tabulars, on testing machine, need flatten the two ends retained part of arc sample during clamping, cause that the tubular product sample bare terminal end is pressed from both sides flat and causes that pipe performance changes in the process that stretches, thereby the mechanical property parameters that obtains and actual value existence are than large deviation.In addition, pressed from both sides in the flat process at segmental arc, sample is offset easily, causes lower clamp center line and sample center line not parallel, and sample produces eccentric force in drawing process, and the material parameter that causes tension test to obtain is inaccurate.
Summary of the invention
Skew taking place when the clamping easily and avoid the tubular product sample bare terminal end to be pressed from both sides flat caused pipe performance to change in order to overcome tubular product sample, the present invention proposes a kind of tensile test fixture that is used for tubular product sample.
The present invention includes two punch anchor clamps, two die anchor clamps, go up location-plate, location-plate, two punch cushion blocks and two die cushion blocks down; The profile of die anchor clamps and punch anchor clamps is identical with structure, and direction is opposite.Two die anchor clamps, two die cushion blocks, two punch anchor clamps and two punch cushion blocks consist of an integral clamp, and two punch cushion blocks are separately fixed on the installed surface of two punch anchor clamps; Two die cushion blocks are separately fixed on the installed surface of two die anchor clamps, and the convex globoidal of punch cushion block are cooperated with the cancave cambered surface of die cushion block become a pair of anchor clamps; Last location-plate and following location-plate are separately fixed on the side surface of two punch anchor clamps.Tensile test fixture is connected the location by the punch clamp flange with the die clamp flange with testing machine; Be processed with scale on the location-plate, according to the adjusted size location-plate of tubular product sample bare terminal end chord length Width, parallel with the center line of last lower clamp to guarantee the tubular product sample center line.Tensile test fixture is connected the location by the punch clamp flange with the die clamp flange with testing machine.
The described mounting hole that the die cushion block is arranged on the plane of die anchor clamps has the mounting hole of punch cushion block on the plane of punch anchor clamps; The mounting hole that following location-plate is arranged respectively at a side surface of die anchor clamps and punch anchor clamps.
Another surface of described die anchor clamps and punch anchor clamps is a cascaded surface, has formed die clamp flange and punch clamp flange respectively.
A surface of described die cushion block is the plane, and another middle part, surface is a cancave cambered surface; The arc radius of die cushion block is consistent with the tubular product sample external diameter; Be processed with groove on the cancave cambered surface, corresponding at the mounting hole on the die cushion block with mounting hole on the die anchor clamps.A surface of punch cushion block is the plane, and another middle part, surface is a convex globoidal, and the arc radius of punch cushion block is consistent with the tubular product sample internal diameter; Be processed with groove on the convex globoidal, and the curvature of this convex globoidal is with outward curvature and the profile just as the cancave cambered surface of die supporter piece is consistent.
The present invention has the die cushion block of arc-shaped tooth and punch cushion block that tubular product sample is stuck between two chucks firmly by a pair of, has avoided tubular product sample to be subjected to skid after the load;
The present invention has the die cushion block of arcwall face and punch cushion block that tubular product sample is stuck between two chucks firmly by a pair of, avoids the tubular product sample bare terminal end in the eccentric throw that is produced by the flat back of folder;
The present invention takes the location-plate of two upper-lower position unanimities, position according to tubular product sample bare terminal end chord length direction width adjustment location-plate, guarantee the concentric shafts in the vertical direction of tubular product sample and integral clamp, and grip of testing machine is a pulling force on the single direction to the acting force of tubular product sample, avoiding on tubular product sample a producing additional bending moment, thereby influence the even unilateral stretching of tubular product sample;
The present invention adopts a pair of die cushion block and the punch cushion block that arc-shaped tooth is arranged, can avoid the tubular product sample bare terminal end to be pressed from both sides flat caused pipe performance changes, thereby can test the tensile property of tubing more exactly, for material and mould Design and Machining, finite element simulation provide true and reliable material mechanical parameters.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a stretching clamp general assembly (GA) synoptic diagram of the present invention.
Fig. 2 is the structural representation of stretching chuck of the present invention.
Fig. 3 is the assembling synoptic diagram of stretching chuck of the present invention.
Fig. 4 is the assembling synoptic diagram of punch anchor clamps of the present invention.
Fig. 5 is the assembling synoptic diagram of die anchor clamps of the present invention.
Fig. 6 is the diagrammatic cross-section of die cushion block of the present invention.Among the figure:
1. 6. times location-plates of location-plate 5. tubular product samples, 7. screws, 8. die cushion blocks, 9. punch clamp flange, 10. die clamp flange, 11. scales, 12. center lines on the punch cushion block 2. die anchor clamps 3. punch anchor clamps 4.
Embodiment
Present embodiment is a kind of tensile test fixture that is used for tubular product sample, can obtain mechanical properties of tubular goods parameter accurately by this tensile test fixture.
As depicted in figs. 1 and 2, present embodiment comprises by two die anchor clamps 2, two die cushion blocks 8, two punch anchor clamps 3 and two integral clamps that punch cushion block 1 is formed, and goes up location-plate 4, location-plate 6 and screw 7 down.
Wherein, die anchor clamps 2 and punch anchor clamps 3 cooperatively interact and become a pair of anchor clamps; The profile of die anchor clamps 2 and punch anchor clamps 3 is identical with structure, and direction is opposite; It is the plane that a surface is respectively arranged on die anchor clamps 2 and the punch anchor clamps 3, and the mounting hole of die cushion block 8 is arranged on the plane of die anchor clamps 2, and the mounting hole of punch cushion block 1 is arranged on the plane of punch anchor clamps 3; Another surface of die anchor clamps 2 and punch anchor clamps 3 is a cascaded surface, has formed die clamp flange 10 and punch clamp flange 9 respectively, so that assemble with testing machine; The mounting hole that two following location-plates 6 are arranged respectively in the middle of a side surface of die anchor clamps 2 and punch anchor clamps 3, and between the mounting hole of location-plate 6 down own centre line 12 so that the accurate location of location-plate 6 down.
Die cushion block 8 and punch cushion block 1 are plate.A surface of die cushion block 8 is the plane, and another surface middle part is a cancave cambered surface, and is corresponding with mounting hole on the die anchor clamps 2 at the mounting hole on the die cushion block 8; A surface of punch cushion block 1 is the plane, and another surface middle part be a convex globoidal, and the curvature of this convex globoidal is consistent with the curvature and the profile of outer cancave cambered surface just as die supporter piece 8; The curvature of die cushion block 8 and punch cushion block 1 is consistent with the curvature of tubular product sample.Following location-plate 6 is " L " shape plate.On the plate face of following location-plate 6, the bar shaped screw hole is arranged, and on this plate face, be carved with scale 11.
Be fixed on a punch cushion block 1 on the installed surface of punch anchor clamps 3 by screw 7; A die cushion block 8 is fixed on the installed surface of die anchor clamps 2 by screw 7, and the convex globoidal of punch cushion block 1 is cooperated with the cancave cambered surface of die cushion block 8, formed a pair of anchor clamps; The bar shaped screw hole of following location-plate 6 by self is fixed on the side surface of punch anchor clamps 3, the bar shaped screw hole of last location-plate 4 by self is fixed on the side surface of punch anchor clamps 3, and it is consistent with following location-plate 6 upper-lower positions to guarantee to go up location-plate 4.
When using present embodiment, respectively punch cushion block 1 is fixed on the punch anchor clamps 3 with screw 7, die cushion block 8 is fixed on the die anchor clamps 2.To descend location-plate 6 to be fastened on the punch anchor clamps 3 according to tubular product sample 5 bare terminal end chord length direction width, and it is consistent with following location-plate 6 upper-lower positions to guarantee to go up location-plate 4.Stretching clamp assembles with cupping machine by punch clamp flange 9 and die clamp flange 10.Tubular product sample is put into by two die anchor clamps 2, two die cushion blocks 8, two punch anchor clamps 3 and two integral clamps that punch cushion block 1 is formed, and make the bottom of tubular product sample 5 and following location-plate 6 paste neat, upper end and last location-plate 4 paste neat, start cupping machine, step up stretching clamp and test.
The sample that adopts is tubular product sample in the present embodiment, and this tubular product sample satisfies the standard that State Standard of the People's Republic of China GB/T 228-2002 " metal material tensile test at room temperature method " is formulated.Testing used material stretch test machine model is CMT5205.
Claims (6)
1. tensile test fixture that is used for tubular product sample, it is characterized in that, described tensile test fixture comprises the integral clamp of being made up of two die anchor clamps (2), two die cushion blocks (8), two punch anchor clamps (3) and two punch cushion blocks (1), and goes up location-plate (4), following location-plate (6) and screw (7); Two punch cushion blocks (1) are separately fixed on the installed surface of two punch anchor clamps (3); Two die cushion blocks (8) are separately fixed on the installed surface of two die anchor clamps (2), and the convex globoidal of punch cushion block (1) are cooperated with the cancave cambered surface of die cushion block (8) become a pair of anchor clamps; To go up location-plate (4) and following location-plate (6) is separately fixed on the side surface of two punch anchor clamps (3); Be processed with scale (11) on the location-plate.
2. a kind of according to claim 1 tensile test fixture that is used for tubular product sample is characterized in that the mounting hole of die cushion block (8) is arranged on the plane of die anchor clamps (2), the mounting hole of punch cushion block (1) is arranged on the plane of punch anchor clamps (3); The mounting hole that following location-plate (6) is arranged respectively at a side surface of die anchor clamps (2) and punch anchor clamps (3).
3. a kind of according to claim 1 tensile test fixture that is used for tubular product sample is characterized in that, another surface of die anchor clamps (2) and punch anchor clamps (3) is a cascaded surface, has formed die clamp flange (10) and punch clamp flange (9) respectively.
4. a kind of according to claim 1 tensile test fixture that is used for tubular product sample is characterized in that, a surface of die cushion block (8) is the plane, and another middle part, surface is a cancave cambered surface, and is processed with groove on this cancave cambered surface; Mounting hole on the die cushion block (8) is corresponding with mounting hole on the die anchor clamps (2); A surface of punch cushion block (1) is the plane, and another surface middle part is a convex globoidal, is processed with groove on the convex globoidal, and the curvature of this convex globoidal is with curvature and the profile just as the cancave cambered surface of die supporter piece (8) is consistent outward.
5. as a kind of tensile test fixture that is used for tubular product sample as described in the claim 2, it is characterized in that die anchor clamps (2) are identical with structure with the profile of punch anchor clamps (3), direction is opposite.
6. as a kind of tensile test fixture that is used for tubular product sample as described in the claim 2, it is characterized in that tensile test fixture is connected the location by punch clamp flange (9) with die clamp flange (10) with testing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101064394A CN101776550B (en) | 2010-02-04 | 2010-02-04 | Tensile test fixture used for tubular product sample |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101064394A CN101776550B (en) | 2010-02-04 | 2010-02-04 | Tensile test fixture used for tubular product sample |
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| CN101776550A true CN101776550A (en) | 2010-07-14 |
| CN101776550B CN101776550B (en) | 2011-04-27 |
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| CN2010101064394A Expired - Fee Related CN101776550B (en) | 2010-02-04 | 2010-02-04 | Tensile test fixture used for tubular product sample |
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| CN102221500A (en) * | 2011-04-28 | 2011-10-19 | 西北工业大学 | Clamp for testing tension and compression performance of laminated plate of composite |
| CN102680320A (en) * | 2012-06-08 | 2012-09-19 | 哈尔滨工业大学 | Fixture for testing tensile properties of ultrathin flexible membrane materials |
| CN103257075A (en) * | 2013-04-29 | 2013-08-21 | 中国科学院金属研究所 | Clamping device for preventing compressive instability in sheet plane |
| CN104101532A (en) * | 2013-04-09 | 2014-10-15 | 中国科学院金属研究所 | Fixture for axial push-pull fatigue testing of metal thin-walled tube sample in high-temperature and high-pressure water |
| CN104198275A (en) * | 2014-08-13 | 2014-12-10 | 湖州广恒链业有限公司 | Detection tool clamping component and detection tool |
| CN104502192A (en) * | 2014-12-02 | 2015-04-08 | 江苏武进不锈股份有限公司 | Strip-type tube test piece drawing device |
| CN104568543A (en) * | 2014-12-23 | 2015-04-29 | 西北工业大学 | Method for testing compression performance of large-diameter thin-walled tube |
| CN104713775A (en) * | 2015-03-26 | 2015-06-17 | 安徽农业大学 | Method for determining position of neuter layer of eccentric tension member bar |
| CN105445096A (en) * | 2014-09-23 | 2016-03-30 | 振石集团恒石纤维基业有限公司 | Testing clamp and method for improving mechanical fatigue performance of composite material |
| CN105973696A (en) * | 2016-07-06 | 2016-09-28 | 哈尔滨理工大学 | Wallboard structure fatigue testing machine clamp |
| CN106483025A (en) * | 2016-11-18 | 2017-03-08 | 中国科学院金属研究所 | The slow tensile test fixture of light-wall pipe arc sample high-temperature high pressure water and using method |
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| US6467357B1 (en) * | 2000-10-25 | 2002-10-22 | Geostar Corp. | Clamping apparatus and method for testing strength characteristics of sheets |
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| CN102221500A (en) * | 2011-04-28 | 2011-10-19 | 西北工业大学 | Clamp for testing tension and compression performance of laminated plate of composite |
| CN102680320A (en) * | 2012-06-08 | 2012-09-19 | 哈尔滨工业大学 | Fixture for testing tensile properties of ultrathin flexible membrane materials |
| CN102680320B (en) * | 2012-06-08 | 2013-12-04 | 哈尔滨工业大学 | Fixture for testing tensile properties of ultrathin flexible membrane materials |
| CN104101532A (en) * | 2013-04-09 | 2014-10-15 | 中国科学院金属研究所 | Fixture for axial push-pull fatigue testing of metal thin-walled tube sample in high-temperature and high-pressure water |
| CN103257075A (en) * | 2013-04-29 | 2013-08-21 | 中国科学院金属研究所 | Clamping device for preventing compressive instability in sheet plane |
| CN103257075B (en) * | 2013-04-29 | 2015-03-25 | 中国科学院金属研究所 | Clamping device for preventing compressive instability in sheet plane |
| CN104198275A (en) * | 2014-08-13 | 2014-12-10 | 湖州广恒链业有限公司 | Detection tool clamping component and detection tool |
| CN105445096A (en) * | 2014-09-23 | 2016-03-30 | 振石集团恒石纤维基业有限公司 | Testing clamp and method for improving mechanical fatigue performance of composite material |
| CN104502192A (en) * | 2014-12-02 | 2015-04-08 | 江苏武进不锈股份有限公司 | Strip-type tube test piece drawing device |
| CN104502192B (en) * | 2014-12-02 | 2017-02-22 | 江苏武进不锈股份有限公司 | Strip-type tube test piece drawing device |
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| CN105973696A (en) * | 2016-07-06 | 2016-09-28 | 哈尔滨理工大学 | Wallboard structure fatigue testing machine clamp |
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| CN113751839A (en) * | 2021-08-20 | 2021-12-07 | 合肥聚能电物理高技术开发有限公司 | Plug welding tool and plug welding process for nitrogen pipe and nitrogen screen |
| CN117782788A (en) * | 2024-02-28 | 2024-03-29 | 合肥工业大学 | Low-damage sheet tensile test device and method |
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