CN112098234A - Test fixture of bending strength and toughness - Google Patents
Test fixture of bending strength and toughness Download PDFInfo
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- CN112098234A CN112098234A CN202011047033.3A CN202011047033A CN112098234A CN 112098234 A CN112098234 A CN 112098234A CN 202011047033 A CN202011047033 A CN 202011047033A CN 112098234 A CN112098234 A CN 112098234A
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
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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
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- 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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- 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
- G01N2203/0298—Manufacturing or preparing specimens
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- Health & Medical Sciences (AREA)
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- 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 test tool for bending strength and toughness, which comprises a base and two rollers arranged in parallel at intervals, wherein two first fixing grooves for fixing the rollers are formed in the base, and each roller is provided with a sample fixing mechanism. The invention has the advantages that: the relative positions of the two rollers are fixed by arranging the first fixing groove on the base, so that the two rollers are arranged in parallel and cannot slide or deviate in the test process, and the sample fixing mechanism is correspondingly arranged on each roller, so that the position of the sample relative to the rollers can be fixed in the test process, and more accurate test data can be obtained according to a standard test method.
Description
Technical Field
The invention relates to a test tool for bending strength and toughness.
Background
According to the method 2 part of the test method for the physical properties of the rare earth permanent magnet material, namely the determination of mechanical properties, of the national standard GB/T31967.2-2015, the test method is to complete the bending resistance and fracture test by using an upper roller and a lower roller.
Then, in the actual test process, because the sample is easy to slide on the smooth roller, that is, the sample is easy to be placed obliquely, the test result is higher, and the error fluctuation is larger.
Disclosure of Invention
The invention aims to provide a test tool for bending strength and toughness, which can effectively solve the problem that the bending strength and toughness of the existing rare earth permanent magnet material are not easy to fix the sample position, so that the test result has larger deviation.
In order to solve the technical problems, the invention is realized by the following technical scheme: the utility model provides a test fixture of bending strength and toughness, includes base and two parallel interval arrangement's roller, it has the first fixed slot of two fixed rollers to open on the base, every all be equipped with sample fixed establishment on the roller.
Preferably, the sample fixing mechanism comprises a fixing table and a limiting slide block, the fixing table is fixed at the end of the roller, the limiting slide block is arranged on the roller in a sliding mode, the roller or the base is provided with an elastic device for driving the limiting slide block to move towards the fixing table, after the roller is placed into the first fixing groove, the horizontal height of the fixing table is higher than the horizontal height of the roller, the sample is limited along the axial direction of the roller through the fixing table and the limiting slide block, meanwhile, the elastic device is installed, the limiting slide block can apply force to the fixing table on the sample during testing, and the sample is prevented from deviating.
Preferably, the cross section of the first fixing groove is in a semi-circular arc shape, the cross section of the limiting slide block is also in a semi-circular arc shape, the inner diameters of the first fixing groove and the limiting slide block are the same as the outer diameter of the roller, and the semi-circular arc shape can limit the relative position of the roller and can play a role in the process of not interfering the roller test.
Preferably, be equipped with the ejector pin of pressing from both sides tight sample with the fixed station cooperation on the terminal surface of spacing slider, spacing slider and too big meeting are too high to the machined part precision requirement of spacing slider contact surface with the sample contact surface, and reduce spacing slider and sample contact surface through the ejector pin, ensure that the sample can be steady and accord with placing on the roller of standard, can also reduce the requirement to the spacing slider terminal surface simultaneously.
Preferably, the elastic device comprises an elastic piece, one end of the elastic piece is fixed on the base, the other end of the elastic piece is abutted to the end face, far away from the fixed table, of the limiting slide block, and axial force is always applied to the limiting slide block through the elastic piece during testing, so that the clamping force of the limiting slide block and the fixed table is guaranteed.
Preferably, the elastic device comprises an elastic piece, one end of the elastic piece is fixed on the corresponding roller, the other end of the elastic piece abuts against the end face, far away from the fixed table, of the limiting sliding block, and the other mode of arranging the elastic piece can also ensure that the sliding block and the fixed table are matched with enough clamping force.
Preferably, the elastic member is a spring plate or a torsion spring, which is simple to obtain and can provide a sufficient and reliable elastic force.
Preferably, every still be equipped with the fixed column on the other base of roller, the one end of elastic component is fixed on the fixed column, sets up the fixed column, reduces the processing complexity of elastic component.
Preferably, the fixed station is also cylindrical, the outer diameter of the fixed station is larger than that of the roller, a second fixed groove matched with the fixed station is formed in the base, the second fixed groove is communicated with the first fixed groove, the fixed station and the roller can be integrally processed, the processing difficulty is reduced, and the fixed station can also play a role in axially limiting the roller placed in the base.
Preferably, the base between the two first fixing grooves is provided with a groove, so that the sample is suspended when being supported on the two rollers, and the sample is convenient to take and place.
Compared with the prior art, the invention has the advantages that: the relative positions of the two rollers are fixed by arranging the first fixing groove on the base, so that the two rollers are arranged in parallel and cannot slide or deviate in the test process, and the sample fixing mechanism is correspondingly arranged on each roller, so that the position of the sample relative to the rollers can be fixed in the test process, and more accurate test data can be obtained according to a standard test method.
Drawings
FIG. 1 is a schematic structural view of a test fixture for bending strength and toughness according to the present invention;
FIG. 2 is a schematic structural view of a base according to the present invention;
fig. 3 is a schematic view of the structure of the roller of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, an embodiment of a test fixture for bending strength and toughness of the present invention is an embodiment of a test fixture for bending strength and toughness, which includes a base 1 and two rollers 2 arranged in parallel at intervals, wherein two first fixing grooves 5 for fixing the rollers 2 are formed on the base 1, and a sample fixing mechanism is disposed on each roller 2.
The relative positions of the two rollers 2 are fixed by arranging the first fixing grooves 5 on the base 1, so that the two rollers 2 are arranged in parallel and cannot slide or shift in the test process, and the sample fixing mechanism is correspondingly arranged on each roller 2, so that the position of the sample relative to the rollers 2 in the test process can be fixed, and accurate test data can be obtained according to a standard test method.
Generally, the sample fixing mechanism comprises a fixing table 3 and a limit slider 4, the fixing table 3 is fixed at the end of a roller 2, the limit slider 4 is slidably arranged on the roller 2, the roller 2 or the base 1 is provided with an elastic device for driving the limit slider 4 to move towards the fixing table 3, after the roller 2 is placed in a first fixing groove 5, the horizontal height of the fixing table 3 is higher than that of the roller 2, a sample is clamped through the fixing table 3 and the limit slider 4, and sufficient clamping force is provided through the elastic device.
First fixed slot 5 and limit slider 4's cross section is half circular arc, first fixed slot 5 and limit slider 4's internal diameter is the same with roller 2's external diameter size, half circular arc's first fixed slot 5 can be after roller 2 puts into first fixed slot 5, carry out good spacing to roller 2, prevent roller 2 along axial or radial movement, simultaneously can increase with roller 2's contact surface, let roller 2 more stable, and limit slider 4 cross section also is half circular arc, then can make things convenient for limit slider 4 to follow endwise slip on roller 2, also can let limit slider 4 and roller 2 laminate simultaneously, it is more stable to be limit slider 4 in the location.
The ejector rod 6 matched with the fixing table 3 to clamp the sample is arranged on the end face of the limiting slide block 4 preferably, so that the contact surface between the limiting slide block 4 and the sample is reduced, the machining precision of the end face of the limiting slide block 4 can be reduced, and the stability of the sample can be guaranteed.
Generally, the elastic device comprises an elastic element 7, one end of the elastic element 7 is fixed on the base 1, the other end of the elastic element 7 is abutted against the end face of the limiting slide block 4 far away from the fixed table 3, a clamping force is provided through elastic deformation of the elastic element 7, one end of the elastic element 7 is fixed on the base 1, the elastic element 7 can be more stable when elastically deformed, and in order to reduce the processing difficulty of the elastic element 7 or the elastic element 7 of a practical standard element, a fixed column 8 can be arranged on the base 1 beside the roller 2, and one end of the elastic element 7 is fixed on the fixed column 8; it is of course also possible that one end of the elastic element 7 is fixed to the corresponding roller 2, so that the elastic element 7 and the roller 2 can be replaced simultaneously with respect to being fixed to the base 1. While the elastic member 7 may be a spring plate or a torsion spring or other elastically deformable member.
In order to place the roller 2 more simply and conveniently, the fixed platform 3 is also cylindrical, the outer diameter of the fixed platform 3 is larger than that of the roller 2, a second fixed groove 9 matched with the fixed platform 3 is formed in the base 1, and the second fixed groove 9 is communicated with the first fixed groove 5. In addition, a groove 10 is formed in the base 1 between the two first fixing grooves 5, so that the sample is suspended when being supported on the two rollers 2, and the sample can be conveniently taken and placed.
During the use, increase earlier the interval between fixed station 3 and the spacing slider 4, prevent the sample on two rollers 2, then utilize the elasticity of elastic component 7, drive spacing slider 4 along axial motion, through spacing slider 4 and fixed station 3 combined action, press from both sides tight sample, ensure that the position of sample is in the accurate position that the specification required, then put the pressure head on the sample again, carry out bending strength and temper test to the sample.
For example, Nd75Pr25 with a purity of 99.5%, Dy with a purity of 99.8%, ZrFe alloy and BFe alloy for industrial use, pure Fe for industrial use, Cu, Al, Ga, Co with a purity of 99.5% were prepared in mass% by weight. The contents of the elements are shown in table 1:
| PrNd alloy | Dy | Fe | Co | Zr | Cu | Al | Ga | B |
| 29.1 | 3 | Balance of | 1.50 | 0.12 | 0.15 | 0.20 | 0.20 | 0.97 |
TABLE 1
Putting the prepared raw materials into an alumina crucible, and smelting and melt spinning in a high-frequency vacuum induction smelting furnace to obtain a melt spinning sheet. Putting the melt-spun sheet into a hydrogen breaking furnace at room temperature, introducing hydrogen with the purity of 99.5% into the furnace, absorbing hydrogen for 2 hours, vacuumizing while heating, vacuumizing at the temperature of 500 ℃ for 2 hours, cooling, taking out the hydrogen broken and crushed powder, grinding the powder in an airflow mill by using a nitrogen airflow mill, adding an antioxidant with the mass fraction of 0.1%, and fully mixing by using a V-shaped mixer. After the mixture is formed in a press with an oriented magnetic field of 1.8T, the mixture is placed into a sintering furnace for sintering and aging, and blanks with Br being more than 13.3kG and Hcj being more than 26.5kOe are obtained.
A portion of the blank was machined into a rectangular parallelepiped of 20.00mm 6.00mm 5.00mm (orientation direction) and tested for flexural strength and labeled as class a sample.
Another portion of the blank was machined into a rectangular parallelepiped of 20.00mm 6.00mm 5.06mm (orientation direction). Depositing a 0.15 Tb layer on the surface of a sample by utilizing a PVD sputtering Tb target, carrying out vacuum heat treatment at 925 ℃ for 8h, carrying out vacuum heat treatment at 480 ℃ for 4h, and then thinning the orientation direction to 5mm by utilizing a double-end-face mill to obtain a magnet product with Br of more than 13.2kG and Hcj of more than 35 kOe. Flexural strength tests were performed and labeled as type T samples.
The class a samples were tested on the apparatus of the invention and the class T samples were tested using the conventional method with a span of 14.5mm and consistent head pressure, with the results shown in table 2:
TABLE 2
It can be seen from the above table that the error fluctuation of the device of the present invention is significantly smaller than that of the conventional test method.
The above description is only an embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications within the technical field of the present invention by those skilled in the art are covered by the claims of the present invention.
Claims (10)
1. The utility model provides a test fixture of bending strength and toughness which characterized in that: the device comprises a base (1) and two rollers (2) arranged in parallel at intervals, wherein a first fixing groove (5) for fixing the rollers (2) is formed in the base (1), and a sample fixing mechanism is arranged on each roller (2).
2. The tool of claim 1, wherein the tool comprises: the sample fixing mechanism comprises a fixing table (3) and a limiting sliding block (4), the fixing table (3) is fixed at the end part of the roller (2), the limiting sliding block (4) is arranged on the roller (2) in a sliding mode, the roller (2) or the base (1) is provided with an elastic device for driving the limiting sliding block (4) to move towards the fixing table (3), and after the roller (2) is placed into the first fixing groove (5), the horizontal height of the fixing table (3) is higher than the horizontal height of the roller (2).
3. The testing tool for bending strength and toughness of claim 2, wherein: the cross section of the first fixing groove (5) is in a semi-circular arc shape, the cross section of the limiting sliding block (4) is also in a semi-circular arc shape, and the inner diameters of the first fixing groove (5) and the limiting sliding block (4) are the same as the outer diameter of the roller (2).
4. The testing tool for bending strength and toughness of claim 2, wherein: and the end surface of the limiting slide block (4) is provided with an ejector rod (6) which is matched with the fixed platform (3) to clamp a sample.
5. The testing tool for bending strength and toughness of claim 2, wherein: the elastic device comprises an elastic piece (7), one end of the elastic piece (7) is fixed on the base (1), and the other end of the elastic piece (7) abuts against the end face, far away from the fixed table (3), of the limiting slide block (4).
6. The testing tool for bending strength and toughness of claim 2, wherein: the elastic device comprises an elastic piece (7), one end of the elastic piece (7) is fixed on the corresponding roller (2), and the other end of the elastic piece (7) abuts against the end face, far away from the fixed table (3), of the limiting slide block (4).
7. The test fixture of bending strength and toughness of claim 5 or 6, characterized in that: the elastic piece (7) is a spring piece or a torsion spring.
8. The tool of claim 5, wherein the tool comprises: each roller (2) is also provided with a fixed column (8) on the other base (1), and one end of the elastic piece (7) is fixed on the fixed column (8).
9. The testing tool for bending strength and toughness of claim 2, wherein: the fixed station (3) is also cylindrical, the outer diameter of the fixed station (3) is larger than that of the roller (2), a second fixed groove (9) matched with the fixed station (3) is formed in the base (1), and the second fixed groove (9) is communicated with the first fixed groove (5).
10. The tool of claim 1, wherein the tool comprises: and a groove (10) is also formed in the base (1) between the two first fixing grooves (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011047033.3A CN112098234A (en) | 2020-09-29 | 2020-09-29 | Test fixture of bending strength and toughness |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011047033.3A CN112098234A (en) | 2020-09-29 | 2020-09-29 | Test fixture of bending strength and toughness |
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| CN112098234A true CN112098234A (en) | 2020-12-18 |
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| CN202011047033.3A Pending CN112098234A (en) | 2020-09-29 | 2020-09-29 | Test fixture of bending strength and toughness |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0354250A1 (en) * | 1988-08-01 | 1990-02-14 | Carl Schenck Ag | Perforation test apparatus for material samples or components |
| CN101499346A (en) * | 2008-01-30 | 2009-08-05 | 浙江大学 | Sintered NdFeB permanent magnet with high working temperature and high corrosion resistance |
| CN102331376A (en) * | 2011-06-24 | 2012-01-25 | 赵宏伟 | Cross-scale micro-nano in-situ three-point bending mechanical performance testing platform |
| CN206632391U (en) * | 2017-03-27 | 2017-11-14 | 无锡市创源科技有限公司 | A kind of copper three-jaw frock |
| CN206671072U (en) * | 2017-03-30 | 2017-11-24 | 南京航空航天大学 | A kind of three-point bending fatigue experimental device |
| CN107807052A (en) * | 2017-11-20 | 2018-03-16 | 马鞍山市顺泰稀土新材料有限公司 | A kind of hoist engine wirerope detection means |
| CN109387442A (en) * | 2018-10-31 | 2019-02-26 | 中国人民解放军第五七九工厂 | A kind of bend test fixture that can accurately adjust span and method |
| CN208588633U (en) * | 2018-08-02 | 2019-03-08 | 三峡大学 | A kind of beams of concrete three point bending test device |
| CN111133319A (en) * | 2017-09-13 | 2020-05-08 | 安东帕有限责任公司 | Handling device for handling a measuring probe |
-
2020
- 2020-09-29 CN CN202011047033.3A patent/CN112098234A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0354250A1 (en) * | 1988-08-01 | 1990-02-14 | Carl Schenck Ag | Perforation test apparatus for material samples or components |
| CN101499346A (en) * | 2008-01-30 | 2009-08-05 | 浙江大学 | Sintered NdFeB permanent magnet with high working temperature and high corrosion resistance |
| CN102331376A (en) * | 2011-06-24 | 2012-01-25 | 赵宏伟 | Cross-scale micro-nano in-situ three-point bending mechanical performance testing platform |
| CN206632391U (en) * | 2017-03-27 | 2017-11-14 | 无锡市创源科技有限公司 | A kind of copper three-jaw frock |
| CN206671072U (en) * | 2017-03-30 | 2017-11-24 | 南京航空航天大学 | A kind of three-point bending fatigue experimental device |
| CN111133319A (en) * | 2017-09-13 | 2020-05-08 | 安东帕有限责任公司 | Handling device for handling a measuring probe |
| CN107807052A (en) * | 2017-11-20 | 2018-03-16 | 马鞍山市顺泰稀土新材料有限公司 | A kind of hoist engine wirerope detection means |
| CN208588633U (en) * | 2018-08-02 | 2019-03-08 | 三峡大学 | A kind of beams of concrete three point bending test device |
| CN109387442A (en) * | 2018-10-31 | 2019-02-26 | 中国人民解放军第五七九工厂 | A kind of bend test fixture that can accurately adjust span and method |
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Application publication date: 20201218 |