CN110132724B - Gleeble heat drawing system with controlled soaking zone length - Google Patents
Gleeble heat drawing system with controlled soaking zone length Download PDFInfo
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- CN110132724B CN110132724B CN201910367560.3A CN201910367560A CN110132724B CN 110132724 B CN110132724 B CN 110132724B CN 201910367560 A CN201910367560 A CN 201910367560A CN 110132724 B CN110132724 B CN 110132724B
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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
- G01N2203/0202—Control of the test
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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
- G01N2203/0298—Manufacturing or preparing specimens
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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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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a Gleeble thermal stretching system capable of controlling the length of a uniform temperature zone, which comprises a sample (1), a filling layer (3) and clamping blocks (4), wherein the sample (1) is connected with the clamping blocks (4) through the filling layer (3), grooves capable of controlling the conductive and heat transfer areas between the sample (1) and the clamping blocks (4) are arranged at the two ends of the sample (1), and the grooves can guide current and heat transmission paths. The invention has simple structure, convenient use and low cost, can realize the control of the length of the uniform temperature area of the sample by simply modifying the structure of the sample and the clamping block, fully utilizes the clamped section of the sample, does not need complex devices or operations, is simple and convenient and has obvious effect.
Description
Technical Field
The invention relates to the technical field of experimental solid mechanics, in particular to a Gleeble thermal stretching system capable of controlling the length of a uniform temperature zone.
Background
The thermal simulation test technology can simply and conveniently simulate the behavior of a metal material in the hot working process, is widely used in the research field of the metal hot working technology, particularly aims at materials (such as hot stamping boron steel, titanium alloy and the like) with structure change caused by rapid temperature change in the hot working process, and is particularly important for accurately measuring the mechanical property of the materials under the condition of dynamic temperature change, and can better meet the test requirement by using the thermal simulation test technology. The key problem in the thermal simulation test is heating and temperature control, the heating mode of the prior Gleeble thermal simulation testing machine is self-resistance heating, and temperature control is realized by temperature measurement feedback of a thermocouple wire welded on a sample, the mode can only accurately control the temperature of a temperature measurement point in principle, and temperature gradients exist in other areas of the sample, which can affect the accuracy of a test result. The sample area with the temperature gradient within the acceptable range is called as the homogeneous region, and the length of the homogeneous region of the sample cannot be effectively controlled by the original clamp of the Gleeble thermal simulation testing machine at present. It has been found that the length of the isothermal zone of the test area of the specimen changes when the path of the current flowing in the specimen changes, but the test requirements and the constraints on the operating space of the tester do not allow the dimensions of the specimen to vary too much. At present, the scheme for solving the problem of controlling the length of the uniform temperature zone is not common, and m.ganapathy et al (m.ganapathy et al, materc Web conf, 2015; m.ganapathy et al, exp.mech, 2018.) have obtained an ideal length of the uniform temperature zone by changing the size of a sample and the structure of a clamp, but the device is complicated and the operation process is inconvenient. It can be seen that there is a need for a Gleeble system that can conveniently and efficiently control the length of the uniform temperature zone.
Patent document CN 108007769A discloses a clamp and a method for a high-temperature tensile test of an extremely-low-modulus composite material, which comprises an upper tensile unit and a lower tensile unit; the stretching unit comprises a U-shaped clamp, a gasket, a fastening screw, a baffle plate and a pre-tightening screw. The beneficial effects of the invention are: the clamp can lead the sample to freely expand in the heating process, and eliminate the influence of thermal stress, thereby improving the accuracy of the test result; the connection of the clamp and the sample adopts a suspension mode of loading on the arc end surface, the loading end of the sample is stressed uniformly, and the loading end is prevented from being damaged firstly when the sample is pulled; the gasket is adopted to position the flat plate sample, so that the clamping stability of the flat plate sample is ensured, and the failure probability of the test is reduced; the adopted sample is a plate-shaped sample with equal thickness, the processing is convenient, and the economy is good; the clamp is made of high-strength high-temperature-resistant materials. The clamp can also be applied to the tensile test of high-temperature materials with weaker tensile strength. However, the material of the invention needs to be butted with a high-temperature environment furnace, a tensile sample is arranged in the high-temperature environment furnace, and then the sample is heated by a high-temperature environment furnace control system, so that the heating mode is complicated, and the temperature zone length of the sample is difficult to control.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a Gleeble hot stretching system capable of controlling the length of a temperature equalizing zone.
The Gleeble thermal stretching system capable of controlling the length of the uniform temperature zone comprises a sample, a filling layer and clamping blocks, wherein the sample is connected with the clamping blocks through the filling layer, grooves capable of controlling the conductive area and the heat transfer area between the sample and the clamping blocks are arranged at two ends of the sample, and the grooves can guide current and heat transmission paths.
Preferably, the clamping surface of the clamping block is provided with a protruding part, and the clamping block transmits current and heat to the sample through the protruding part.
Preferably, one or more grooves are arranged on the clamping surface of the clamping block.
Preferably, a filling layer is arranged between the sample and the clamping surface of the clamping block, and the sample is in direct contact connection with the convex part on the clamping surface of the clamping block.
Preferably, the contact area of the sample with the convex part on the clamping surface of the clamping block is changed by any one or more of the following methods:
-varying the size of the area of the protrusion on the clamping face of the clamping block;
-changing the contact area between the sample and the raised portion of the clamping surface of the clamping block by adding a filling layer between the sample and the raised portion of the clamping surface of the clamping block.
Preferably, the test piece, the filling layer and the clamping block are provided with positioning pin holes, and the positioning pins penetrate through the positioning pin holes in the test piece, the filling layer and the clamping block to position the test piece.
Preferably, the sample is a conductive and heat conductive material, the clamping block is made of a conductive and heat conductive material, and the positioning pin and the filling layer are made of an insulating and heat insulating material.
Preferably, the positioning pin hole on the clamping block is tangent to the vertical surface of the groove on the clamping surface of the clamping block.
Preferably, the grooves on the two ends of the sample are in a U shape, and the contact area of the sample and the clamping blocks and the distance of current flowing through the sample are controlled by controlling the opening width of the U-shaped groove, the distance from two vertical arms of the U-shaped groove to the edge of the sample, the distance from the bottom or the opening end of the U-shaped groove to the edge of the sample and the length of the sample clamped by the clamping blocks.
Preferably, the grooves on the two ends of the sample can guide current and heat to be conducted in a wave shape on the clamped parts on the two ends of the sample, the number of waves is controlled through the grooves, and the length of a current and heat conducting path is further controlled; the width and length of the current and heat conducting path are controlled to control the size of the current and heat conducting area.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention has simple structure, convenient use and low cost, can realize the control of the length of the uniform temperature area of the sample by simply modifying the structure of the sample and the clamping block, fully utilizes the clamped section of the sample, does not need complex devices or operations, is simple and convenient and has obvious effect.
2. The clamping block can be repeatedly used, so that the cost is further reduced.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic view showing the structure of the clamped portions at both ends of the sample in FIG. 1.
FIG. 3 is a schematic view of the structure of the clamping block of the present invention.
Fig. 4 is a schematic structural diagram of another embodiment of the present invention.
FIG. 5 is a schematic view showing the structure of the clamped portions at both ends of the sample in FIG. 4.
The figures show that:
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The invention discloses a Gleeble thermal stretching system capable of controlling the length of a uniform temperature zone, which aims to solve the problems that the length of the uniform temperature zone is difficult to control or even cannot be controlled by the existing system, a control device or a process is complex and the like, and comprises a sample 1, a positioning pin 2, a filling layer 3 and a clamping block 4; the inclined surface of the clamping block 4 is contacted with a clamping table of a Gleeble testing machine to realize clamping; the clamping block 4 is grooved and is contacted with the sample 1 through the filling layer 3; the positioning pin 2 penetrates through the clamping block 4 and the positioning hole of the sample 1 to realize positioning and clamping; the two ends of the sample 1 are grooved by the clamping parts, and the length of the uniform temperature zone is controlled by adjusting the groove size parameters. The method is used for controlling the length of the uniform temperature zone of the sample when the metal plate is stretched at high temperature on the Gleeble platform.
The invention can realize the control of the length of the uniform temperature area of the sample by simply modifying the structures of the clamping block 4 and the sample 1, fully utilizes the clamped section of the sample 1, does not need complex devices or operations, is simple and convenient and has obvious effect; the invention only makes simple change to the clamped section of the sample 1, and does not have any influence on the test of the mechanical property; the materials such as hard copper alloy and hard stainless steel used by the clamping block 4, and the materials such as ceramics and bakelite used by the filling layer 3 and the positioning pin 2 are cheap and easy to obtain, so that the implementation cost of the invention is low; the clamp can be repeatedly used, so that the cost is further reduced.
The Gleeble thermal stretching system capable of controlling the length of the uniform temperature zone, as shown in FIGS. 1-5, comprises a sample 1, a filling layer 3 and a clamping block 4, wherein the sample 1 is connected with the clamping block 4 through the filling layer 3, grooves capable of controlling the conductive and heat transfer areas between the sample 1 and the clamping block 4 are arranged at two ends of the sample 1, and the grooves can guide current and heat transmission paths.
As shown in fig. 3, a convex portion is provided on the clamping surface of the clamping block 4, and the clamping block 4 transmits current and heat to the sample 1 through the convex portion. One or more grooves are arranged on the clamping surface of the clamping block 4, and the grooves have a heat dissipation effect.
And a filling layer 3 is arranged between the clamping surfaces of the sample 1 and the clamping block 4, and the sample 1 is in direct contact connection with the convex part on the clamping surface of the clamping block 4. The filling layer 3 is integral or discrete. The contact area of the sample 1 and the convex part on the clamping surface of the clamping block 4 is changed by any one or more of the following methods:
changing the size of the area of the protrusion on the clamping surface of the clamping block 4;
by adding a filling layer 3 between the sample 1 and the bulge on the clamping surface of the clamping block 4, the contact area of the sample 1 and the bulge on the clamping surface of the clamping block 4 is changed.
Still include locating pin 2, be provided with the locating pin hole on sample 1, filling layer 3, the clamp splice 4, locating pin 2 runs through the locating pin hole on sample 1, filling layer 3, the clamp splice 4 and fixes a position sample 1. The sample 1 is a conductive and heat-conductive material, the clamping block 4 is made of a conductive and heat-conductive material, and the positioning pin 2 and the filling layer 3 are made of an insulating and heat-insulating material. And the positioning pin hole on the clamping block 4 is tangent to the vertical surface of the groove on the clamping surface of the clamping block 4.
As shown in fig. 1 and fig. 2, the grooves on both ends of the sample 1 are U-shaped, and the contact area between the sample 1 and the clamping block 4 and the path of current flow are controlled by controlling the opening width of the U-shaped groove, the distance between two vertical arms of the U-shaped groove and the edge of the sample 1, the distance between the bottom or open end of the U-shaped groove and the edge of the sample 1, and the length of the sample 1 clamped by the clamping block 4.
As shown in fig. 4 and 5, the grooves on both ends of the sample 1 can guide the current and heat to be wave-shaped conducted on the clamped parts on both ends of the sample, and the number of waves is controlled by the grooves, so as to control the length of the current and heat conducting path; the width and length of the current and heat conducting path are controlled to control the size of the current and heat conducting area.
Fig. 1 and fig. 2 are schematic structural diagrams of an embodiment of the present invention, in which arrows in fig. 2 indicate current flow, and a diagonal filled area is a conductive area where a sample 1 contacts a clamping block 4. The present example includes a sample 1, a positioning pin 2, a filling layer 3, and a clamping block 4; the number of the clamping blocks 4 is 4, inclined planes, grooves and positioning holes are machined in the clamping blocks, and the inclined planes are in contact with a clamping table of a Gleeble testing machine to realize clamping; the number of the positioning pins 2 is 2, and the positioning pins penetrate through the clamping blocks 4 and the positioning holes of the test sample 1. The clamping block 4 is made of hard materials with good electric and heat conducting properties, such as hard copper alloy, hard stainless steel and the like, and the processing mode can be numerical control milling, linear cutting and the like; the positioning pin 2 and the filling layer 3 need to be made of hard materials with good insulation performance, such as ceramics, bakelite and the like; the groove on the block 4 is used for controlling the electric conduction and heat transfer area between the sample and the clamp; in order to prevent the positioning pin 2 from bending or breaking under a large force, the positioning hole on the clamping block 4 needs to be tangent to the vertical surface of the groove on the positioning hole; the contact area of the sample 1 and the clamping block 4 and the current flowing path can be controlled by controlling the sizes of the grooves (the values of a2, b2, c2 and d2 shown in fig. 2) on the sample 1, so that the length of the temperature equalizing zone in the test area of the sample can be controlled.
FIG. 3 is a schematic structural view of the clamping block, wherein a broken line circle is a partial enlarged structural view, and arrows in the enlarged structural view indicate current flow directions;
fig. 4 and 5 are schematic structural diagrams of another embodiment of the present invention, in which arrows in fig. 5 indicate current flow direction, and the diagonal filled areas are conductive areas where the sample 1 and the clamping blocks 4 are in contact. The present example includes a sample 1, a positioning pin 2, a filling layer 3, and a clamping block 4; the number of the clamping blocks 4 is 4, inclined planes, grooves and positioning holes are machined in the clamping blocks, and the inclined planes are in contact with a clamping table of a Gleeble testing machine to realize clamping; the number of the positioning pins 2 is 2, and the positioning pins penetrate through the clamping blocks 4 and the positioning holes of the test sample 1. The clamping block 4 is made of hard materials with good electric and heat conducting properties, such as hard copper alloy, hard stainless steel and the like, and the processing mode can be numerical control milling, linear cutting and the like; the positioning pin 2 and the filling layer 3 need to be made of hard materials with good insulation performance, such as ceramics, bakelite and the like; the groove on the clamping block 4 is used for controlling the electric conduction and heat transfer area between the sample and the clamp; in order to prevent the positioning pin 2 from bending or breaking under a large force, the positioning hole on the clamping block 4 needs to be tangent to the vertical surface of the groove on the positioning hole; the contact area of the sample 1 and the clamping block 4 and the current flowing path can be controlled by controlling the sizes of the grooves (the values of a1, b1, c1 and d1 shown in fig. 5) on the sample 1, so that the length of the temperature equalizing zone in the test area of the sample can be controlled.
The process of using the present invention for hot tensile testing is as follows:
firstly, determining the size of a sample: the size of the sample 1 (mainly referring to the size of the grooves on the clamped parts at the two ends of the sample 1, namely the values of a2, b2, c2 and d2 shown in fig. 2 or the values of a1, b1, c1 and d1 shown in fig. 5) is determined according to the requirement of the temperature equalizing zone length of the sample 1 during the test, and the determination method can be numerical simulation or experimental measurement and the like.
Secondly, sample loading and clamp assembling: positioning pins 2 respectively penetrate through positioning holes in the sample 1, the filling layer 3 and the clamping block 4, so that the sample 1, the filling layer 3 and the clamping block 4 are assembled, and the assembled clamp is shown in FIG. 1 or FIG. 4;
thirdly, clamping by a clamp and centering a sample: placing the assembled clamp into a Gleeble testing machine clamping table, and operating the testing machine to apply a certain pre-tightening tension to the clamp, so that clamping of the clamp and sample centering can be realized;
fourthly, hot tensile test: sample 1 was tested for thermal tensile properties by applying electricity (heat) and stretching through a Gleeble tester chuck.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910367560.3A CN110132724B (en) | 2019-05-05 | 2019-05-05 | Gleeble heat drawing system with controlled soaking zone length |
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| CN201910367560.3A CN110132724B (en) | 2019-05-05 | 2019-05-05 | Gleeble heat drawing system with controlled soaking zone length |
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| CN110132724B true CN110132724B (en) | 2021-03-09 |
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| CN114018688A (en) * | 2021-10-09 | 2022-02-08 | 唐山钢铁集团有限责任公司 | Test sample, clamp and method for testing thermal simulation tensile property of laser tailor-welded blank |
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