CN113670719A - Plane strain compression test die with one die for dual purposes - Google Patents
Plane strain compression test die with one die for dual purposes Download PDFInfo
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- CN113670719A CN113670719A CN202110909711.0A CN202110909711A CN113670719A CN 113670719 A CN113670719 A CN 113670719A CN 202110909711 A CN202110909711 A CN 202110909711A CN 113670719 A CN113670719 A CN 113670719A
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- pressure head
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive 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
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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Abstract
The invention discloses a one-die dual-purpose plane strain compression test die; the upper pressure head and the lower pressure head are of a composite structure type plane, namely two first molded surfaces and a second molded surface positioned between the two first molded surfaces; the width of the second molded surface is smaller than that of the first molded surface; the lower fixing seat comprises four guide blocks, the guide blocks and the first molded surfaces of the upper pressure head and the lower pressure head form a rectangular channel, and the rectangular channel is used as a channel limiting die during plane strain compression; and the second molded surface positioned in the middle of the upper pressure head and the lower pressure head is an open space in the axial direction and the radial direction, and is used as a non-channel limiting die in plane strain compression. When a channel is needed to limit the strain compression of the sample, the sample is arranged between the second profiles of the upper pressure head and the lower pressure head; when the strain compression of the sample is limited without a channel, the sample extends into a rectangular channel formed by surrounding the guide block and the two first molded surfaces, and the strain test of two principles can be completed without recombination and disassembly.
Description
Technical Field
The invention relates to the field of plane strain compression test dies, in particular to a plane strain compression test die with one die for two purposes.
Background
In order to obtain the mechanical properties and the flow law of the metal material, physical simulation is usually carried out by adopting test methods such as a unidirectional tensile test, a unidirectional compression test, a plane strain compression test and the like, in the metal plastic forming processes such as plate rolling, flow spinning and the like, the material can freely flow in two directions, the material flow is limited in the other direction, the characteristic of typical plane strain is realized, and the plane strain compression test is particularly suitable for researching the physical simulation of the material flow law during plate rolling and flow spinning.
Taking the cylindrical flow spinning as an example, in the flow spinning process, the material in the forming area is in a three-way stress state, wherein the forming area is under compressive stress in the radial direction and the tangential direction in the forward spinning process, and is in a tensile stress state in the axial direction.
Because the stress-strain states of the plane strain compression test and the flow spinning forming are similar, and the plane strain compression test can obtain larger strain amount, the stress-strain relation of the material in the flow spinning process can be physically simulated by adopting the plane strain compression test.
The compression mold of the plane strain compression test mainly has two forms, the plane strain compression test of the first form puts forward requirements on the dimensional relationship of the compression mold and a compression sample, thereby realizing the rigid constraint in the width direction, the loading deformation in the thickness direction and the material flowing deformation in the length direction;
the second type of plane strain compression test is a channel groove compression mold, and the flow direction of the material is limited by the mold surface of the mold, so that the material can only flow along the compression direction and the channel direction, and the physical simulation of plane strain is realized.
In the prior art, when two kinds of strain compression tests are required, molded surfaces of an upper pressure head and a lower pressure head need to be replaced and adjusted, the positions of the upper pressure head and the lower pressure head or a fixed seat can be changed only through different combination forms in the process, and the upper pressure head and the lower pressure head or the fixed seat are recombined after being disassembled, so that the experimental efficiency is influenced, the test period is delayed, and in the process of frequent disassembly and assembly, indexes such as loss and service life of the precision of a die are inevitably influenced.
Disclosure of Invention
The present invention is directed to overcoming the above-mentioned disadvantages and drawbacks of the prior art and providing a dual-purpose flat strain compression test mold. The invention can carry out plane strain compression tests in two forms only by changing the profile structure of the contact surfaces of the compression sample and the upper and lower pressure heads and without disassembling and reassembling the die.
The invention fully combines the characteristics of two forms of plane strain compression tests, ensures the dual-purpose function of one die, greatly simplifies the die structure, saves the test cost and greatly simplifies the test operation procedure.
The invention is realized by the following technical scheme:
a plane strain compression test mould with one mould for two purposes comprises an upper pressure head 1 and a lower pressure head 2 opposite to the upper pressure head; the upper pressure head 1 and the lower pressure head 2 are respectively arranged on the mounting grooves of the upper fixing seat 11 and the lower fixing seat 21;
the corresponding surfaces of the upper pressure head 1 and the lower pressure head 2 are respectively composite structure type planes which are symmetrical in structure and are positioned on the same horizontal plane;
the composite structural profile comprises two first profiles 33 and a second profile 22 located between the two first profiles 33; the width of the second profile 22 is smaller than the width of the remaining first profile 33;
the lower fixed seat 21 comprises four vertical guide blocks 3;
the four guide blocks 3 are divided into two groups, each group is divided into two groups, and the two groups are respectively and symmetrically positioned at two sides of the first molded surface 33; the length of the corresponding surface of each group of guide blocks 3 is equal to that of the first molded surface 33;
the corresponding side surfaces of each group of guide blocks 3 are mutually parallel planes, the two planes surround the first molded surfaces 33 of the upper pressure head 1 and the lower pressure head 2 to form a rectangular channel, and the rectangular channel is used as a channel limiting die in plane strain compression;
and the second molding surface 22 positioned in the middle of the upper pressure head 1 and the lower pressure head 2 is an open space in the axial direction and the radial direction, and is used as a non-channel limiting mold during plane strain compression.
The cross-sectional shape structure of the first profile 33 is rectangular, and the cross-sectional shape structure of the second profile 22 is isosceles trapezoid.
When a channel is needed to limit the strain compression of the sample, the sample is placed between the second profiles 22 of the upper pressure head 1 and the lower pressure head 2; when the strain compression of the sample is limited without a channel, the sample extends into a rectangular channel formed by the guide block 3 and the two first molded surfaces 33 in a surrounding manner, and the strain test of two principles can be completed without recombination and disassembly.
The width of the second profile 22 is one half or one third of the width of the first profile 33; the second profile 22 is of equal length to the first profile 33.
The included angle of the isosceles trapezoid is 30-45 degrees.
The upper pressure head 1 and the guide block 3 are in clearance fit by H8/d 8.
A side plate 44 is respectively fixed at the end part of the mounting groove of the upper pressure head 1 and the lower pressure head 2;
and the corresponding positions of the side plates 44 and the mounting grooves are provided with jackscrews 55 for tightly jacking the two ends of the upper pressure head 1 and the lower pressure head 2, so that the upper pressure head 1 and the lower pressure head 2 are axially fixed.
When the second molding surface 22 is used for a strain compression test, the ratio of the width of the sample to the width of the second molding surface 22 is 6-10; the ratio of the width of the second molding surface 22 to the thickness of the sample is 2 to 4.
The side plate 44, the upper fixing seat 11 and the lower fixing seat 21 are fixedly connected by bolts.
The joint surfaces among the side plate 44, the upper pressure head 1 and the lower pressure head 2 are all in plane contact;
go up pressure head 1, lower pressure head 2 and the tank bottom surface of mounting groove to and the groove side is plane contact.
The guide block 3 is of a rectangular structure.
Compared with the prior art, the invention has the following advantages and effects:
the lower fixed seat 11 of the invention is provided with four guide blocks which are divided into two groups; the corresponding side surfaces of each group of guide blocks 3 are mutually parallel planes, the two planes surround the first molded surfaces 33 of the upper pressure head 1 and the lower pressure head 2 to form a rectangular channel, and the rectangular channel is used as a channel limiting die in plane strain compression; and the second molding surface 22 positioned in the middle of the upper pressure head 1 and the lower pressure head 2 is an open space in the axial direction and the radial direction, and is used as a non-channel limiting mold during plane strain compression.
The four guide blocks 3 not only limit the material of the sample to flow only in the compression direction and the channel length direction when the guide blocks are used as a channel limiting mould for test; meanwhile, the upper pressure head 1 is guided, the upper pressure head 1 and the lower pressure head 2 are centered, and the precision of a plane strain compression test is guaranteed.
When a channel is needed to limit the strain compression of the sample, the sample is placed between the second profiles 22 of the upper pressure head 1 and the lower pressure head 2; when the non-channel limitation sample strain compression is needed, the sample extends into the rectangular channel formed by the guide block 3 and the two first molded surfaces 33 in a surrounding mode, the strain tests of the two principles can be completed under the condition of no recombination and disassembly, the operation efficiency is greatly improved, one die is dual-purpose, namely one die is used, and the physical simulation effect of the plane strain compression tests of the two modes can be realized.
The invention has two purposes by one die, has simple and easy technical means, greatly simplifies the die structure, saves the test cost, and overcomes the influence of frequently replacing the pressure head on the die precision and the service life when the traditional test die changes the test type.
According to the one-die dual-purpose plane strain compression test die, the lower pressure head base can play a role in guiding the upper pressure head, and the upper pressure head and the lower pressure head are good in alignment, so that the plane strain compression test has high precision, and a more accurate material flow rule is obtained through simulation.
Drawings
FIG. 1 is a schematic structural view of a one-mold dual-purpose plane strain compression test mold according to the present invention.
Fig. 2 is a schematic structural view of the upper ram and the lower ram of fig. 1.
Fig. 3 is a structural schematic diagram of a first conventional plane strain compression test mold.
Fig. 4 is a structural schematic diagram of a second conventional plane strain compression test mold.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The invention discloses a one-die dual-purpose plane strain compression test die, which comprises an upper pressure head 1 and a lower pressure head 2 opposite to the upper pressure head; the upper pressure head 1 and the lower pressure head 2 are respectively arranged on the mounting grooves of the upper fixing seat 11 and the lower fixing seat 21;
the corresponding surfaces of the upper pressure head 1 and the lower pressure head 2 are respectively composite structure type planes which are symmetrical in structure and are positioned on the same horizontal plane;
the composite structural profile comprises two first profiles 33 and a second profile 22 located between the two first profiles 33; the width of the second profile 22 is smaller than the width of the remaining first profile 33; namely, the middle is narrow and the two sides are wide and have a plane structure.
The lower fixed seat 21 comprises four vertical guide blocks 3;
the four guide blocks 3 are divided into two groups, each group is divided into two groups, and the two groups are respectively and symmetrically positioned at two sides of the first molded surface 33; the length of the corresponding surface of each group of guide blocks 3 is equal to that of the first molded surface 33;
the corresponding side surfaces of each group of guide blocks 3 are mutually parallel planes, the two planes surround the first molded surfaces 33 of the upper pressure head 1 and the lower pressure head 2 to form a rectangular channel, and the rectangular channel is used as a channel limiting die in plane strain compression;
and the second molding surface 22 positioned in the middle of the upper pressure head 1 and the lower pressure head 2 is an open space in the axial direction and the radial direction, and is used as a non-channel limiting mold during plane strain compression.
The four guide blocks 3 limit the material of the sample to flow only in the compression direction and the channel length direction when being used as a channel limiting mould for test; meanwhile, the upper pressure head 1 is guided, the upper pressure head 1 and the lower pressure head 2 are centered, and the precision of a plane strain compression test is guaranteed.
The cross-sectional shape structure of the first profile 33 is rectangular; the cross-sectional shape of the second molding surface 22 is isosceles trapezoid, but may be rectangular or other shapes, depending on the application requirements.
When a channel is needed to limit the strain compression of the sample, the sample is placed between the second profiles 22 of the upper pressure head 1 and the lower pressure head 2; when the strain compression of the sample is limited without a channel, the sample extends into a rectangular channel formed by the guide block 3 and the two first molded surfaces 33 in a surrounding manner, and the strain test of two principles can be completed without recombination and disassembly.
The width of the second profile 22 is one half or one third of the width of the first profile 33; the second profile 22 is of equal length to the first profile 33.
The included angle of the isosceles trapezoid is 30-45 degrees, and other angles can be adopted according to the practical application condition.
In order to maintain the precision, a clearance fit of H8/d8 is adopted between the upper pressure head 1 and the guide block 3.
A side plate 44 is respectively fixed at the end part of the mounting groove of the upper pressure head 1 and the lower pressure head 2;
and the corresponding positions of the side plates 44 and the mounting grooves are provided with jackscrews 55 for tightly jacking the two ends of the upper pressure head 1 and the lower pressure head 2, so that the upper pressure head 1 and the lower pressure head 2 are axially fixed and prevented from axially moving.
When the second molding surface 22 is used for a strain compression test, in order to ensure that the deformation of the sample in the width direction can be ignored, the ratio of the width of the sample to the width of the second molding surface 22 is 6-10; to ensure uniform deformation between the indenters, the ratio of the width of the second profile 22 to the thickness of the sample is 2 to 4. Of course other ratios are possible.
The side plate 44, the upper fixing seat 11 and the lower fixing seat 21 are connected in a bolt fixing mode.
The joint surfaces among the side plate 44, the upper pressure head 1 and the lower pressure head 2 are all in plane contact; go up pressure head 1, lower pressure head 2 and the tank bottom surface of mounting groove to and the groove side is plane contact.
The guide block 3 is in a rectangular structure, and the contact between the guide block and the upper pressing head 1 and the contact between the guide block and the lower pressing head 2 are planes and are in sliding fit relation.
Two test requirements of the one-die dual-purpose plane strain compression test die are as follows, and sample sizes are as follows:
in the case of strain compression of the channel-free confinement sample: the sample can be a cuboid with the size of 5mm multiplied by 20mm multiplied by 30 mm;
when the channel limits the strain compression of the sample: the sample may be a rectangular parallelepiped of 6 mm. times.6 mm. times.12 mm. In order to reduce the influence of the friction force between the sample and the die in the plane strain compression test, a layer of lubricating oil or graphite is required to be coated on the surfaces of the sample, which are in contact with the upper pressure head 1 and the lower pressure head 2 before the test.
As described above, the present invention can be preferably realized.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (10)
1. A plane strain compression test die with one die and two purposes comprises an upper pressure head (1) and a lower pressure head (2) opposite to the upper pressure head; the upper pressure head (1) and the lower pressure head (2) are respectively arranged on the mounting grooves of the upper fixing seat (11) and the lower fixing seat (21); the method is characterized in that:
the corresponding surfaces of the upper pressure head (1) and the lower pressure head (2) are respectively composite structure type planes which are symmetrical in structure and are positioned on the same horizontal plane;
the composite structural profile plane comprises two first profiles (33) and a second profile (22) located between the two first profiles (33); the width of the second profile (22) is smaller than the width of the remaining first profile (33);
the lower fixed seat (21) comprises four vertical guide blocks (3);
the four guide blocks (3) are divided into two groups, each group is divided into two guide blocks, and the two guide blocks are respectively and symmetrically positioned on two sides of the first molded surface (33); the length of the corresponding surface of each group of guide blocks (3) is equal to that of the first molded surface (33);
the side surfaces corresponding to each group of guide blocks (3) are planes which are parallel to each other, the planes and the first molded surfaces (33) of the upper pressure head (1) and the lower pressure head (2) surround to form a rectangular channel, and the rectangular channel is used as a channel limiting die during plane strain compression;
and the second molded surface (22) positioned in the middle of the upper pressure head (1) and the lower pressure head (2) is an open space in the axial direction and the radial direction, and is used as a non-channel limiting die in plane strain compression.
2. The dual-purpose one-die flat strain compression test die of claim 1, wherein:
the cross section shape structure of the first molded surface (33) is rectangular, and the cross section shape structure of the second molded surface (22) is isosceles trapezoid;
when a channel is needed to limit the strain compression of the sample, the sample is placed between the upper pressure head (1) and the second molded surface (22) of the lower pressure head (2);
when the strain compression of the sample is limited without a channel, the sample extends into a rectangular channel formed by the guide block (3) and the two first molded surfaces (33).
3. The dual-purpose one-die flat strain compression test die of claim 2, wherein:
the width of the second profile (22) is one half or one third of the width of the first profile (33); the second profile (22) is of equal length to the first profile (33).
4. The dual-purpose one-die flat strain compression test die of claim 3, wherein:
the included angle of the isosceles trapezoid is 30-45 degrees.
5. The dual-purpose one-die flat strain compression test die of claim 4, wherein:
the upper pressure head (1) and the guide block (3) are in clearance fit by H8/d 8.
6. The one-die dual-purpose plane strain compression test die of claim 5, wherein:
a side plate (44) is respectively fixed at the end parts of the mounting grooves of the upper pressure head (1) and the lower pressure head (2); and jackscrews (55) used for tightly jacking the two ends of the upper pressure head (1) and the lower pressure head (2) are arranged at the corresponding positions of the side plates (44) and the mounting grooves, so that the upper pressure head (1) and the lower pressure head (2) are axially fixed.
7. The dual-purpose plane strain compression test mold of claim 6, wherein:
when the second molded surface (22) is subjected to a strain compression test, the ratio of the width of the sample to the width of the second molded surface (22) is 6-10; the ratio of the width of the second molding surface (22) to the thickness of the sample is 2 to 4.
8. The dual-purpose one-die flat strain compression test die of claim 7, wherein:
the side plate (44), the upper fixing seat (11) and the lower fixing seat (21) are fixedly connected through bolts.
9. The dual-purpose one-die flat strain compression test die of claim 8, wherein:
the joint surfaces among the side plate (44), the upper pressure head (1) and the lower pressure head (2) are all in plane contact;
go up pressure head (1), lower pressure head (2) and the tank bottom surface of mounting groove to and the groove side is plane contact.
10. The dual-purpose one-die flat strain compression test die of claim 9, wherein: the guide block (3) is of a rectangular structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110909711.0A CN113670719B (en) | 2021-08-09 | 2021-08-09 | Plane strain compression test die with one die for dual purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110909711.0A CN113670719B (en) | 2021-08-09 | 2021-08-09 | Plane strain compression test die with one die for dual purposes |
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| Publication Number | Publication Date |
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| CN113670719A true CN113670719A (en) | 2021-11-19 |
| CN113670719B CN113670719B (en) | 2022-10-25 |
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| CN202110909711.0A Active CN113670719B (en) | 2021-08-09 | 2021-08-09 | Plane strain compression test die with one die for dual purposes |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092377A (en) * | 2015-08-11 | 2015-11-25 | 北方工业大学 | Testing device for realizing plane strain state in large deformation range and data processing method |
| CN109975105A (en) * | 2019-03-29 | 2019-07-05 | 北京航空航天大学 | A kind of plate thickness detected automatically is to resistance of deformation test mould |
| CN110333137A (en) * | 2019-08-16 | 2019-10-15 | 西北工业大学 | A kind of thin-walled plate tube material compression performance test sample, fixture and method |
| JP2019219235A (en) * | 2018-06-19 | 2019-12-26 | Ｊｆｅスチール株式会社 | Biaxial compression tensile test tool and biaxial compression tensile test method |
-
2021
- 2021-08-09 CN CN202110909711.0A patent/CN113670719B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105092377A (en) * | 2015-08-11 | 2015-11-25 | 北方工业大学 | Testing device for realizing plane strain state in large deformation range and data processing method |
| JP2019219235A (en) * | 2018-06-19 | 2019-12-26 | Ｊｆｅスチール株式会社 | Biaxial compression tensile test tool and biaxial compression tensile test method |
| CN109975105A (en) * | 2019-03-29 | 2019-07-05 | 北京航空航天大学 | A kind of plate thickness detected automatically is to resistance of deformation test mould |
| CN110333137A (en) * | 2019-08-16 | 2019-10-15 | 西北工业大学 | A kind of thin-walled plate tube material compression performance test sample, fixture and method |
Non-Patent Citations (2)
| Title |
|---|
| 潘红波等: "平面应变压缩技术的研究", 《锻压技术》 * |
| 黄小明等: "平面应变的试验方法及其应用", 《锻压技术》 * |
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