CN108896386B - Clamping device for high-temperature tensile sample of metal sheet and using method of clamping device - Google Patents
Clamping device for high-temperature tensile sample of metal sheet and using method of clamping device Download PDFInfo
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- CN108896386B CN108896386B CN201810580574.9A CN201810580574A CN108896386B CN 108896386 B CN108896386 B CN 108896386B CN 201810580574 A CN201810580574 A CN 201810580574A CN 108896386 B CN108896386 B CN 108896386B
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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
- 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
- G01N3/18—Performing tests at high or low temperatures
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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
- G01N2203/0017—Tensile
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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
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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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
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
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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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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Abstract
The invention provides a clamping device for a high-temperature tensile sample of a metal sheet, which comprises a clamp body and a clamping part connected to the clamp body, wherein a groove is formed in one end, far away from a threaded hole, of the clamping part; set gradually wedge gasket I in the recess, annular gasket I, the sample, annular gasket II and wedge gasket II, the top of wedge gasket I is provided with downwardly extending and the longitudinal section is the guide way I of U type, the bottom of wedge gasket I is provided with fixed block I, the top of wedge gasket II is provided with downwardly extending and the longitudinal section is the guide way II of U type, the bottom of wedge gasket II is provided with fixed block II, the fixed pin passes through-hole I in proper order, annular gasket I, the sample, fix the sample on the clamping part behind annular gasket II and the through-hole II. The device has the characteristics of small size, simple and convenient operation and the like, can easily complete centering and fixing of the sample, and achieves the purposes of shortening the test preparation period and improving the test efficiency.
Description
Technical Field
The invention relates to the technical field of mechanical property testing of metal materials, in particular to a clamping device for a metal sheet high-temperature tensile sample and a using method thereof.
Background
When a laboratory performs a high-temperature tensile test on a metal sheet, a dumbbell-shaped plate-shaped test sample with a pin hole machined in a clamping end is generally connected with a U-shaped high-temperature tensile fixture by using a pin, and gaskets with proper thickness are respectively added on two sides of the pin hole to limit lateral deformation of the two sides of the pin hole, so that the requirement of meeting a test standard is met. However, in actual operation, because the gasket and the sample are placed in the U-shaped fixture, the total thickness of the gasket and the sample clamping end is inevitably smaller than the distance between two side walls of the U-shaped fixture, the problem that a certain gap exists between two sides of a sample pin hole cannot be avoided, if local deformation is generated at the pin hole position in the stretching process, the test result is deviated, and even cracking near the pin hole is generated, so that the test failure is caused. On the basis of the method, a plurality of improved design schemes are invented by changing a pin into a screw for fastening and matching with other designs, for example, patent number CN102830012A introduces a clamping control device for a foil strip high-temperature tensile test, patent number CN 202267627U introduces a thin plate high-temperature tensile clamp and the like, the clamping of the devices is firm, but samples with different thicknesses can ensure the alignment by processing gaskets with matched thicknesses, the operation is complex and difficult, and the universality of the clamping device is poor.
In actual operation, the clamping of sheet metal high temperature tensile sample needs to possess the characteristics in two aspects, need to guarantee on the one hand that the sample exposed core is closely fixed, prevents that the sample from appearing near the deformation of pinhole, drawing in the middle of the pinhole and opening or head edge fracture scheduling problem and leading to the test failure, and on the other hand needs to guarantee that the central line of sample is unanimous with the atress direction after the clamping, prevents to cause the test result because of additional moment of torsion and produces the deviation. The existing clamping method capable of meeting the test requirements generally has the problems of complex structure, complex operation and the like, and seriously influences the test efficiency.
Disclosure of Invention
The invention aims to provide a clamping device for a high-temperature tensile sample of a metal sheet and a using method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a clamping device for a metal sheet high-temperature tensile sample is characterized in that two ends of the sample are provided with fixing portions, each fixing portion is provided with a pin hole, the clamping device clamps and fixes the sample through the pin holes, the clamping device comprises a clamp body and a clamping portion connected to the clamp body, one end of the clamp body is provided with a threaded hole, the other end of the clamp body is provided with a clamping portion integrally arranged with the clamp body, one end, far away from the threaded hole, of the clamping portion is provided with a groove with an isosceles trapezoid-shaped cross section, the groove extends to one side of the clamp body along the end portion of the clamping portion, and penetrates through the side wall of the clamping portion;
the test device is characterized in that a wedge-shaped gasket I, an annular gasket I, a test sample, an annular gasket II and a wedge-shaped gasket II are sequentially arranged in the groove, a guide groove I which extends downwards and is U-shaped in longitudinal section is formed in the top end of the wedge-shaped gasket I, a fixing block I is arranged at the bottom end of the wedge-shaped gasket I, and a positioning hole I is formed in the fixing block I; the top end of the wedge-shaped gasket II is provided with a guide groove II which extends downwards and has a U-shaped longitudinal section, the bottom end of the wedge-shaped gasket II is provided with a fixing block II, and the fixing block II is provided with a positioning hole II; positioning pins are arranged in the positioning holes I and the positioning holes II;
the clamping part is provided with a through hole I and a through hole II, the through hole I and the through hole II are symmetrically arranged on two sides of the groove, the central axes of the through hole I and the through hole II are overlapped, fixing pins are arranged in the through hole I and the through hole II, and the fixing pins sequentially penetrate through the through hole I, the annular gasket I, the sample, the annular gasket II and the through hole II to fix the sample on the clamping part;
wedge gasket I sets up through the top guide way I is inserted and is established annular gasket I with in the space between the recess lateral wall, wedge gasket II sets up through the top guide way II is inserted and is established annular gasket II with in the space between the recess lateral wall, wedge gasket I and II relative sample symmetries of wedge gasket set up, the wedge surface of wedge gasket I and wedge gasket II laminates with the both sides wall of recess respectively, the width of guide way I and guide way II is not less than the diameter of fixed pin.
Further, one end of the clamp body is provided with a threaded hole, a connecting rod is installed in the threaded hole, and one end, far away from the threaded hole, of the connecting rod is connected with the tensile test equipment.
Furthermore, the wedge angles of the wedge-shaped gasket I and the wedge-shaped gasket II are the same as the base angle of an isosceles trapezoid surrounded by the cross section of the groove.
Furthermore, the inner diameters of the annular gasket I and the annular gasket II are the same as the inner diameter of the pin hole.
Further, the annular gasket I and the annular gasket II are made of any one of high-nickel alloy, austenitic stainless steel and copper alloy with large thermal expansion coefficient.
Further, the wedge-shaped gasket I and the wedge-shaped gasket II are made of any one of high-nickel alloy, austenitic stainless steel and copper alloy with large thermal expansion coefficients.
Furthermore, the fixing block I and the fixing block II are of semicircular structures.
The use method of the clamping device for the high-temperature tensile sample of the metal sheet comprises the following steps:
a. connecting the clamp body with the connecting rod in a threaded manner;
b. the fixture body is horizontally placed on an operation table, the annular gasket I, the fixing part at one end of the sample and the annular gasket II are placed in the groove, and the fixing pin sequentially penetrates through the through hole I, the annular gasket I, the pin hole corresponding to the fixing part, the annular gasket II and the through hole II from left to right to fix the sample on the clamping part;
c. installing a positioning pin in a positioning hole I and a positioning hole II, taking one end of a wedge-shaped gasket I with a guide groove I and one end of the wedge-shaped gasket II with a guide groove II as a wedging end, aligning a clamping part with a gap between an annular gasket I and a gap between the clamping part and the annular gasket II respectively, aligning the guide groove I and the guide groove II with a fixing pin, respectively penetrating the guide groove I and the guide groove II through the fixing pin in the process of uniformly and forcibly pressing the wedge-shaped gasket I and the wedge-shaped gasket II, and continuously and uniformly and forcibly pressing the wedge-shaped gasket I and the wedge-shaped gasket II to realize centering and fixing of a sample;
d. repeating the step c, and fixing the other fixed end of the sample;
e. connecting the sample and the clamp body with tensile test equipment, putting the sample and the clamp body into a high-temperature furnace for heating and heat preservation, and then completing a tensile process;
f. after the tensile is ended, take off sample and anchor clamps body from tensile test equipment, place on the operation panel, treat that it cools off to the room temperature, tap the one end that wedge gasket I and wedge gasket II wedged earlier, can take off wedge gasket I and wedge gasket II, then extract the fixed pin, accomplish clamping device's dismantlement, experimental end.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the invention abandons the former clamp body structure with a square or U-shaped opening, designs a clamping part with a trapezoidal opening in the front-back direction, the groove is arranged in the center of the end part of the clamping part, the clamping parts on the two sides of the groove are symmetrically distributed, and the wedge-shaped gasket I and the wedge-shaped gasket II are matched correspondingly, so that the wedge-shaped gasket I and the wedge-shaped gasket II are only required to be respectively aligned and inserted into gaps between the clamping part and the annular gasket I and between the clamping part and the annular gasket II, the tight connection between the sample and the clamping part can be realized, and the coaxiality of the center of the sample and the stress direction is good;
2. the inner side surface of the groove and the wedge-shaped surfaces of the wedge-shaped gasket I and the wedge-shaped gasket II are kept with certain roughness, after the wedge-shaped gasket I and the wedge-shaped gasket II are gently inserted into the clamping part, the relative position between the wedge-shaped gasket I and the clamping part can be ensured by means of friction force caused by the surface roughness, and the problems that the wedge-shaped gasket I and the wedge-shaped gasket II slide down and the like cannot occur in the process of moving the clamping device and connecting the clamping device with tensile test equipment;
3. the inner diameter sizes of the annular gasket I and the annular gasket II are consistent with the size of the pin hole at the fixed end of the sample, and the annular gasket can tightly restrict the lateral deformation near the pin hole of the sample, so that the problems of test failure or reduction of the precision of a test result caused by the deformation near the pin hole of the sample, the pulling notch in the middle of the pin hole or the fracture of the edge of the head of the sample are fundamentally eliminated;
4. the wedge-shaped gasket I, the wedge-shaped gasket II, the annular gasket I and the annular gasket II are made of materials with larger thermal expansion coefficients, the thicknesses of the four gaskets are increased due to expansion in the sample heating and heat preservation processes, the deformation near a sample pin hole is restrained by acting force generated by laterally extruding a sample, the deformation, the pulling gap or the head edge fracture and the like near the sample pin hole are prevented, meanwhile, the micro gap left in the assembling process of the sample and the clamping part can be closed, and the firm connection between the sample and the clamping part is completed;
5. the device has the advantages of small and exquisite structure, simple use method and good centering and fixing effects;
6. the clamping method can clamp the high-temperature tensile samples of the metal sheets with the series of specifications and sizes through a set of tool, the wedge-shaped gasket I and the wedge-shaped gasket II, has strong universality, and can be used for a high-temperature tensile test of the metal sheets with the thickness of more than or equal to 0.3mm through verification;
7. the clamping device has the advantages that the fastening force of the clamping device is derived from the lateral force generated when the wedge-shaped gasket I and the wedge-shaped gasket II are wedged and the lateral acting force generated by the thermal expansion of the wedge-shaped gasket I, the wedge-shaped gasket II, the annular gasket I and the annular gasket II, the force value is large, and the binding effect on the clamping end of the sample is good.
Drawings
FIG. 1 is a schematic view of the mounting structure of the clamping device of the present invention;
FIG. 2 is a schematic view of the clamping assembly of the present invention at another angle;
FIG. 3 is a schematic view of the structure of the clamp body and clamping portion of the present invention;
FIG. 4 is a schematic top view of the clamping portion of the present invention;
FIG. 5 is a schematic structural view of a wedge shim I of the present invention;
FIG. 6 is a schematic view of the structure of FIG. 5 at another angle;
FIG. 7 is a stress-strain graph of example 2;
FIG. 8 is a stress-strain graph of example 3;
the labels in the figure are: 1. the anchor clamps body, 101, the screw hole, 2, the clamping part, 201, the recess, 202, through-hole I, 203, through-hole II, 3, wedge gasket I, 301, fixed block I, 302, locating hole I, 303, guide way I, 4, wedge gasket II, 401, fixed block II, 402, locating hole II, 403, guide way II, 5, the locating pin, 6, the sample, 7, annular gasket I, 8, annular gasket II, 9, the fixed pin.
Detailed Description
The embodiments of the present invention are described in detail with reference to the accompanying drawings, and the embodiments and specific operations of the embodiments are provided on the premise of the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
Example 1
As shown in the attached drawings, the clamping device for the high-temperature tensile sample of the metal sheet is characterized in that fixing parts are arranged at two ends of the sample 6, each fixing part is provided with a pin hole, the clamping device clamps and fixes a sample 6 through a pin hole, the clamping device comprises a clamp body 1 and a clamping part 2 connected with the clamp body 1, one end of the clamp body 1 is provided with a threaded hole 101, a connecting rod is arranged in the threaded hole 101, one end of the connecting rod, which is far away from the threaded hole 101, is connected with tensile test equipment, the other end of the clamp body 1 is provided with a clamping part 2 which is integrally arranged with the clamp body, one end of the clamping part 2 far away from the threaded hole 101 is provided with a groove 201 with an isosceles trapezoid cross section, the groove 201 extends to one side of the clamp body 1 along the end part of the clamping part 2, and the groove 201 penetrates through the side wall of the clamping part 2;
the invention abandons the former clamp body structure with a square or U-shaped opening, designs a clamping part 2 with a trapezoidal opening in the front-back direction, the groove 201 is arranged in the center of the end part of the clamping part 2, the clamping parts 2 on the two sides of the groove 201 are symmetrically distributed and matched with the corresponding wedge-shaped gasket I3 and the corresponding wedge-shaped gasket II 4, the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 are only required to be respectively aligned and inserted into gaps between the clamping part 2 and the annular gasket I7 and between the clamping part 2 and the annular gasket II 8, the tight connection between the sample 6 and the clamping part 2 can be realized, and the coaxiality of the center of the sample and the stress direction is good;
a wedge-shaped gasket I3, an annular gasket I7, a test sample 6, an annular gasket II 8 and a wedge-shaped gasket II 4 are sequentially arranged in the groove 201, the wedge angles of the wedge-shaped gaskets I3 and II 4 are the same as the base angle of an isosceles trapezoid surrounded by the cross section of the groove 201, the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 are symmetrically arranged at two sides of the sample 6, the inner side surface of the groove 2 and the wedge-shaped surfaces of the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 both keep certain roughness, after the wedge-shaped gasket I and the wedge-shaped gasket II are lightly inserted into the clamping part, the relative position between the wedge-shaped gasket and the clamping part can be ensured by means of the friction force caused by the surface roughness, the problems that the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 slide off and the like cannot occur in the process of moving the clamping device and connecting the clamping device with the tensile test equipment;
the top end of the wedge-shaped gasket I3 is provided with a guide groove I303 which extends downwards and is U-shaped in longitudinal section, the bottom end of the wedge-shaped gasket I3 is provided with a fixed block I301, the guide groove I303 extends to one side of the fixed block I301 along the end part of the wedge-shaped gasket I3, the guide groove I303 penetrates through the side wall of the wedge-shaped gasket I3, and the fixed block I301 is provided with a positioning hole I302;
the top end of the wedge-shaped gasket II 4 is provided with a guide groove II 403 which extends downwards and is U-shaped in longitudinal section, the bottom end of the wedge-shaped gasket II 4 is provided with a fixed block II 401, the guide groove II 403 extends towards one side of the fixed block II 401 along the end part of the wedge-shaped gasket II 4, the guide groove II 403 penetrates through the side wall of the wedge-shaped gasket II 4, a positioning hole II 402 is arranged on the fixed block II 401, the fixed block I301 and the fixed block II 401 are of semicircular structures, the positioning hole I302 is arranged at the central position of the fixed block I301, the positioning hole II 402 is arranged at the central position of the fixed block II 401, and positioning pins 5 are arranged in the positioning hole I302 and the positioning hole II 402; the sizes of the openings of the guide groove I303 and the guide groove II 403 are slightly larger than the diameter of the fixing pin 9, the inner diameters of the annular gasket I7 and the annular gasket II 8 are consistent with the size of a pin hole at the fixed end of the sample 6, and the annular gasket can tightly restrict the lateral deformation near the pin hole of the sample, so that the problems of test failure or reduction of the precision of a test result caused by the deformation near the pin hole of the sample, the pulling notch in the middle of the pin hole or the fracture of the edge of the head of the sample are fundamentally eliminated;
the wedge-shaped gasket I3 is inserted into a gap between the annular gasket I7 and the side wall of the groove 201 through the guide groove I303 arranged at the top end, the wedge-shaped gasket II 4 is inserted into a gap between the annular gasket II 8 and the side wall of the groove 201 through the guide groove II 403 arranged at the top end, the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 are symmetrically arranged relative to a sample, the wedge-shaped surfaces of the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 are respectively attached to the two side walls of the groove 201, and the widths of the guide groove I303 and the guide groove II 403 are not smaller than the diameter of the fixing pin 9;
the wedge-shaped gasket I3, the wedge-shaped gasket II 4, the annular gasket I7 and the annular gasket II 8 are made of materials with larger thermal expansion coefficients, and the materials can be any one of high nickel alloy, austenitic stainless steel and copper alloy with larger thermal expansion coefficients; in the sample heating and heat preservation processes, the thicknesses of the four gaskets are increased due to expansion, the acting force generated by laterally extruding the sample is used for restraining the deformation near the sample pin hole, the deformation, the pulling gap or the head edge fracture and the like near the sample pin hole are prevented, meanwhile, the micro gap left in the sample and clamping part assembling process can be closed, and the firm connection between the sample and the clamping part is completed;
be provided with I202 of through-hole and II 203 of through-hole on the clamping part 2, I202 of through-hole with II 203 symmetry of through-hole sets up in the both sides of recess 201 and the coincidence of the central axis between them, I202 of through-hole with install fixed pin 9 in II 203 of through-hole, fixed pin 9 passes I202 of through-hole, annular gasket I7, sample 6, II 8 of annular gasket and through-hole II 203 back in proper order and fixes sample 6 on the clamping part 2.
The use method of the clamping device for the high-temperature tensile sample of the metal sheet comprises the following steps:
a. connecting the clamp body 1 with a connecting rod in a threaded manner;
b. the clamp body 1 is horizontally placed on an operation table, an annular gasket I7, a fixing part at one end of the sample 6 and an annular gasket II 8 are placed in the groove 201, and the sample 6 is fixed on the clamping part 2 after a fixing pin 9 sequentially penetrates through the through hole I202, the annular gasket I7, a pin hole corresponding to the fixing part, the annular gasket II 8 and the through hole II 203 from left to right;
c. installing a positioning pin 5 in a positioning hole I302 and a positioning hole II 402, taking one end of a wedge-shaped gasket I3 provided with a guide groove I303 and one end of a wedge-shaped gasket II 4 provided with a guide groove II 403 as a wedging end, aligning gaps between a clamping part 2 and an annular gasket I7 and between the clamping part 2 and an annular gasket II 8 correspondingly, aligning the guide groove I303 and the guide groove II 403 with a fixing pin 9, and then in the process of pressing the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 with uniform force, respectively enabling the guide groove I303 and the guide groove II 403 to pass through the fixing pin 9, and realizing centering and fixing of a sample 6 along with continuously pressing the wedge-shaped gasket I3 and the wedge-shaped gasket II 4 with uniform force;
d. repeating the step c, and fixing the other fixed end of the sample 6;
e. connecting the sample 6 together with the clamp body 1 with a tensile test device, putting the tensile test device into a high-temperature furnace for heating and heat preservation, and then finishing the tensile process;
f. after the stretching, take off sample 6 and anchor clamps body 1 from tensile test equipment, place on the operation panel, treat that it cools off to the room temperature, tap the one end that wedge gasket I3 and wedge gasket II 4 wedged earlier, can take off wedge gasket I3 and wedge gasket II 4, then extract fixed pin 9, accomplish clamping device's dismantlement, experimental end.
The device has the advantages of small and exquisite structure, simple use method and good centering and fixing effects; the clamping method can clamp the high-temperature tensile test samples of the metal sheets with the series of specifications and sizes through a set of tool, the wedge-shaped gasket I3 and the wedge-shaped gasket II 4, has strong universality, and can be used for the high-temperature tensile test of the metal sheets with the thickness of more than or equal to 0.3mm through verification;
the fastening force of the clamping device is from the lateral force generated when the wedge-shaped gasket I3 and the wedge-shaped gasket II 2 are wedged and the lateral acting force generated by the thermal expansion of the wedge-shaped gasket I3, the wedge-shaped gasket II 4, the annular gasket I7 and the annular gasket II 8, the force value is large, and the binding effect on the clamping end of the sample is good.
Example 2
According to the clamping device and the using method thereof in the embodiment 1, the material of the metal thin plate is Ti70, the thickness of the metal thin plate is delta =1.5mm, the test temperature of the high temperature furnace is 600 ℃, the high temperature tensile test is carried out, and the obtained stress-strain curve is shown in figure 7.
Example 3
According to the clamping device and the using method thereof in the embodiment 1, the material of the metal thin plate is Ti31, the thickness of the metal thin plate is delta =0.7mm, the test temperature of the high temperature furnace is 350 ℃, the high temperature tensile test is carried out, and the obtained stress-strain curve is shown in figure 8.
It can be seen from the examples 2 and 3 that the clamping device and the using method thereof of the present invention are used for high temperature tensile tests, and the wedge-shaped gasket i3 and the wedge-shaped gasket ii 4 are used for completing high temperature tensile tests of a plurality of specification and size metal sheets, after the tests are finished, the fixed end of the sample has no obvious deformation, and the elasticity section linearity in the obtained stress-strain curve is good, which shows that the clamping device and the using method thereof of the present invention have good universality and usability, and can be popularized.
The technical solutions and embodiments of the present invention are not limited, and the same solutions or effects as those of the technical solutions and embodiments of the present invention are within the scope of the present invention. It is further noted that relational terms such as i, ii, and iii may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (7)
1. The utility model provides a clamping device of sheet metal high temperature tensile sample, the both ends of sample (6) all are provided with the fixed part, all are provided with the pinhole on each fixed part, and this clamping device carries out the clamping through the pinhole to sample (6) and fixes, clamping device includes anchor clamps body (1) and clamping part (2) of connection on anchor clamps body (1), its characterized in that: one end of the clamp body (1) is provided with a threaded hole (101), the other end of the clamp body (1) is provided with a clamping part (2) which is integrally arranged with the clamp body, one end, far away from the threaded hole (101), of the clamping part (2) is provided with a groove (201) with an isosceles trapezoid cross section, the groove (201) extends to one side of the clamp body (1) along the end part of the clamping part (2), and the groove (201) penetrates through the side wall of the clamping part (2);
a wedge-shaped gasket I (3), an annular gasket I (7), a test sample (6), an annular gasket II (8) and a wedge-shaped gasket II (4) are sequentially arranged in the groove (201), a guide groove I (303) which extends downwards and is U-shaped in longitudinal section is formed in the top end of the wedge-shaped gasket I (3), a fixing block I (301) is arranged at the bottom end of the wedge-shaped gasket I (3), and a positioning hole I (302) is formed in the fixing block I (301); a guide groove II (403) which extends downwards and is U-shaped in longitudinal section is formed in the top end of the wedge-shaped gasket II (4), a fixing block II (401) is arranged at the bottom end of the wedge-shaped gasket II (4), and a positioning hole II (402) is formed in the fixing block II (401); positioning pins (5) are arranged in the positioning hole I (302) and the positioning hole II (402);
the clamping part (2) is provided with a through hole I (202) and a through hole II (203), the through hole I (202) and the through hole II (203) are symmetrically arranged on two sides of the groove (201), central axes of the through hole I (202) and the through hole II (203) are overlapped, a fixing pin (9) is arranged in the through hole I (202) and the through hole II (203), and the fixing pin (9) sequentially penetrates through the through hole I (202), the annular gasket I (7), the sample (6), the annular gasket II (8) and the through hole II (203) and then fixes the sample (6) on the clamping part (2);
the wedge-shaped gasket I (3) is inserted into a gap between the annular gasket I (7) and the side wall of the groove (201) through the guide groove I (303) arranged at the top end, the wedge-shaped gasket II (4) is inserted into a gap between the annular gasket II (8) and the side wall of the groove (201) through the guide groove II (403) arranged at the top end, the wedge-shaped gasket I (3) and the wedge-shaped gasket II (4) are symmetrically arranged relative to a sample, the wedge-shaped surfaces of the wedge-shaped gasket I (3) and the wedge-shaped gasket II (4) are respectively attached to the two side walls of the groove (201), and the widths of the guide groove I (303) and the guide groove II (403) are not smaller than the diameter of the fixing pin (9);
the wedge angles of the wedge-shaped gasket I (3) and the wedge-shaped gasket II (4) are the same as the base angle of an isosceles trapezoid surrounded by the cross section of the groove (201).
2. The apparatus of claim 1, wherein the apparatus further comprises: one end of the clamp body (1) is provided with a threaded hole (101), a connecting rod is installed in the threaded hole (101), and one end, far away from the threaded hole (101), of the connecting rod is connected with tensile test equipment.
3. The apparatus of claim 1, wherein the apparatus further comprises: the inner diameters of the annular gasket I (7) and the annular gasket II (8) are the same as the inner diameter of the pin hole.
4. The apparatus of claim 1, wherein the apparatus further comprises: the annular gasket I (7) and the annular gasket II (8) are both made of any one of high-nickel alloy, austenitic stainless steel and copper alloy with large thermal expansion coefficients.
5. The apparatus of claim 1, wherein the apparatus further comprises: the wedge-shaped gasket I (3) and the wedge-shaped gasket II (4) are both made of any one of high-nickel alloy, austenitic stainless steel and copper alloy with large thermal expansion coefficients.
6. The apparatus of claim 1, wherein the apparatus further comprises: the fixing block I (301) and the fixing block II (401) are of semicircular structures.
7. The use method of the clamping device for the high-temperature tensile sample of the metal sheet according to any one of claims 1 to 6, is characterized in that: the method comprises the following steps:
a. connecting the clamp body (1) with the connecting rod in a threaded manner;
b. the clamp body (1) is horizontally placed on an operation table, the annular gasket I (7), the fixing part at one end of the sample (6) and the annular gasket II (8) are placed in the groove (201), the fixing pin (9) sequentially penetrates through the through hole I (202), the annular gasket I (7), the pin hole corresponding to the fixing part, the annular gasket II (8) and the through hole II (203) from left to right, and then the sample (6) is fixed on the clamping part (2);
c. installing a positioning pin (5) in a positioning hole I (302) and a positioning hole II (402), taking one end of a wedge-shaped gasket I (3) provided with a guide groove I (303) and one end of a wedge-shaped gasket II (4) provided with a guide groove II (403) as a first wedging end, aligning gaps between a clamping part (2) and an annular gasket I (7) and between the clamping part (2) and an annular gasket II (8) correspondingly, aligning the guide groove I (303) and the guide groove II (403) with a fixing pin (9), and then respectively penetrating the guide groove I (303) and the guide groove II (403) through the fixing pin (9) in the process of uniformly forcibly pressing the wedge-shaped gasket I (3) and the wedge-shaped gasket II (4), and continuously and uniformly forcibly pressing the wedge-shaped gasket I (3) and the wedge-shaped gasket II (4) to realize centering and fixing of a sample (6);
d. repeating the step c, and fixing the other fixed end of the sample (6);
e. connecting the sample (6) and the clamp body (1) with tensile test equipment, putting the tensile test equipment into a high-temperature furnace for heating and heat preservation, and then finishing the tensile process;
f. after the stretching, take off sample (6) and anchor clamps body (1) from tensile test equipment, place on the operation panel, wait that it cools off to the room temperature, tap the one end that wedge gasket I (3) and wedge gasket II (4) wedged earlier, can take off wedge gasket I (3) and wedge gasket II (4), then extract fixed pin (9), accomplish clamping device's dismantlement, experimental end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810580574.9A CN108896386B (en) | 2018-06-07 | 2018-06-07 | Clamping device for high-temperature tensile sample of metal sheet and using method of clamping device |
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| CN201810580574.9A CN108896386B (en) | 2018-06-07 | 2018-06-07 | Clamping device for high-temperature tensile sample of metal sheet and using method of clamping device |
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| CN108896386A CN108896386A (en) | 2018-11-27 |
| CN108896386B true CN108896386B (en) | 2021-04-02 |
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| CN109883818B (en) * | 2019-02-26 | 2021-03-09 | 上海交通大学 | Clamp suitable for metal plate tensile DIC test |
| CN110618026A (en) * | 2019-08-23 | 2019-12-27 | 北京星航机电装备有限公司 | Sample clamping method for testing high-temperature tensile property of metal sheet |
| CN111829874A (en) * | 2020-07-24 | 2020-10-27 | 中国核动力研究设计院 | Clamp and test method for zirconium tube fatigue test |
| CN112414837A (en) * | 2020-11-06 | 2021-02-26 | 上海电气核电设备有限公司 | Clamping method of high-temperature sheet tensile sample |
| CN114062118A (en) * | 2021-11-12 | 2022-02-18 | 江苏科技大学 | Tension-compression-shearing integrated fiber laminated plate experiment clamp and using method thereof |
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