Clamp for high-temperature stretching of metal material

Abstract

The utility model discloses a fixture for high-temperature stretching of metal materials, which belongs to the technical field of metal material detection and comprises a clamping portion and a connecting portion. The clamping part is fixedly connected with one end of the connecting part; two notch parts which are vertically communicated are formed in the side face of the clamping part to form a first channel and a second channel, the second channel forms an internal hollow structure in the clamping part, the width of the first channel is smaller than that of the second channel, and the first channel penetrates through the top of the clamping part to be communicated with the outside; by arranging the clamping device, the test sample and the clamping device can be conveniently clamped and fixed during a tensile test without threaded connection, so that the problems that the sample is difficult to take out and a threaded section is easy to break due to the fact that a threaded sample is easy to oxidize and deform can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of metal material detection, in particular to a clamp for high-temperature stretching of metal materials. Background Art

[0002] Metal materials are generally resistant to high temperatures and have obvious advantages over plastics and other materials at high temperatures. They can be widely used at high temperatures. However, due to the high tensile strength of metal materials, the clamping friction of ordinary clamps cannot meet the requirements. In one aspect of the prior art, traditional clamps are used to clamp and fix the specimens. Since the clamps are based on friction to fix the specimens, they often have the defects of low clamping strength and rapid decay of the fixing strength at high temperatures. In another aspect of the prior art, threaded auxiliary fixation can be used for high-temperature tensile testing of metal materials to improve the fixing strength. However, in addition to the defect that the fixing strength decays rapidly at high temperatures, this method also has the following defects:

[0003] (1) When metal materials are stretched at high temperatures, the threads are easily oxidized and even diffused and connected. In addition, the specimen and threads are deformed due to the force during the stretching process, making it difficult to remove the specimen;

[0004] (2) When measuring materials with poor toughness, the threaded section is prone to breakage, resulting in the test area not breaking normally and making it impossible to obtain accurate limit data of the test area.

[0005] At present, the market is in urgent need of a fixture that can stably fix samples during high-temperature tensile testing of metal materials, has a fixing strength that meets the requirements, and is easy to disassemble and reuse. Utility Model Content

[0006] In view of the above analysis and in response to the deficiencies in the prior art, the utility model aims to provide a clamp for high-temperature stretching of metal materials to solve at least one of the problems existing in the prior art of high-temperature stretching clamps, such as low fixing strength, rapid attenuation of fixing strength at high temperatures, easy deformation at high temperatures, and difficulty in replacing samples and reusing them.

[0007] The purpose of this utility model is mainly achieved through the following technical solutions:

[0008] A clamp for high-temperature stretching of metal materials, comprising: a clamping part and a connecting part;

[0009] The clamping portion is fixedly connected to one end of the connecting portion;

[0010] The side of the clamping portion is provided with two vertically connected notches to form a first channel and a second channel, wherein the second channel forms an internal hollow structure inside the clamping portion, and the width of the first channel is smaller than that of the second channel;

[0011] The first channel passes through the top of the clamping portion and communicates with the outside.

[0012] Preferably, the clamping portion and the connecting portion are approximately cylindrical or cylindrical, and the two are coaxially fixedly connected.

[0013] Preferably, the test specimen is used for high temperature tensile testing of metal materials, and the test specimen comprises: a cylindrical test area, a first fixing area, and a second fixing area;

[0014] One side of the cylindrical test area is connected to the first fixing area, and the other side is connected to the second fixing area;

[0015] The width of the first channel is greater than the diameter a1 of the cylindrical test area, and the width of the first channel is less than the diameter a2 of the first fixing area, and the width of the second channel is greater than the diameter a3 of the third fixing area.

[0016] Preferably, the first channel is provided with a circular through hole parallel to the stretching direction in a central area near the clamping portion.

[0017] Preferably, a first communication channel is provided between the circular through hole and the side surface of the clamping portion.

[0018] Preferably, the diameter d1 of the circular through hole, the width w1 of the first connecting channel, and the diameter a2 of the first fixing area satisfy: w1≤d1<a2.

[0019] Preferably, the second channel is a through hole penetrating the side of the clamping portion or a through hole connecting the hollow structure and the outside of the clamping portion.

[0020] Preferably, the second channel is provided with a circular chamber near the center area of ​​the clamping portion, and a second connecting channel is provided between the circular chamber and the side surface of the clamping portion.

[0021] Preferably, the diameter d2 of the circular chamber and the width w2 of the second connecting channel satisfy: d2 ≥ w2.

[0022] Preferably, the second channel is a through hole penetrating through a side surface of the clamping portion, and the second channel constitutes a hollow structure inside the clamping portion.

[0023] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0024] (1) The utility model provides a hollow structure in the clamping part of the clamp, and two vertically connected notches are provided on the side of the clamping part to form a first channel and a second channel. The second channel forms an internal hollow structure inside the clamping part, and the width of the first channel is smaller than that of the second channel. The first channel passes through the top of the clamping part and is connected to the outside, so that the test sample and the clamp can be conveniently engaged and fixed during the tensile test without the need for threaded connection, thereby avoiding the problem that the threaded sample is easily oxidized and deformed, resulting in the difficulty of removing the sample and the easy breakage of the threaded section;

[0025] (2) The utility model adopts a circular through hole as the positioning area when the axis of the test specimen coincides with the axis of the clamping portion. Since the lower edge of the circular through hole is arc-shaped, it is more stable when engaged with the first diameter-changing section and the force is more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0027] Figure 1 This is a schematic diagram of the structure of a test specimen for high-temperature tensile testing of metal materials in one embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the structure of a test specimen used for high-temperature tensile testing of metal materials in the prior art;

[0029] Figure 3 It is an isometric side view of a fixture for high temperature stretching of metal materials in one embodiment of the utility model;

[0030] Figure 4 This is a front view of a fixture for high-temperature stretching of metal materials in one embodiment of the utility model;

[0031] Figure 5a It is a cross-sectional view of the AA surface of the fixture for high-temperature drawing of metal materials in one embodiment of the utility model;

[0032] Figure 5b It is a cross-sectional view of the AA surface of the fixture for high-temperature drawing of metal materials in another embodiment of the present utility model;

[0033] Figure 6a This is a cross-sectional view of the BB surface of the fixture for high-temperature drawing of metal materials in one embodiment of the utility model;

[0034] Figure 6b This is a cross-sectional view of the BB surface of the fixture for high-temperature drawing of metal materials in another embodiment of the present utility model;

[0035] Figure 6cIt is a cross-sectional view of the BB surface of the fixture for high-temperature stretching of metal materials in the third embodiment of the present utility model.

[0036] Reference numerals

[0037] Test specimen 1, cylindrical test area 101, first diameter reducing section 102a, second diameter reducing section 102b, first fixing area 103a, second fixing area 103b, third diameter reducing section 104a, fourth diameter reducing section 104b, first threaded connection portion 105a, second threaded connection portion 105b, third fixing area 106a, fourth fixing area 106b;

[0038] Fixture 2, clamping portion 201, connecting portion 202;

[0039] A circular through hole 2011, a first connecting channel 2012, a second channel 2013, and a clamping portion body 2014;

[0040] The second connecting channel 2013a and the circular chamber 2013b. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects solved by the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0042] On the one hand, the utility model discloses a test specimen for high temperature tensile testing of metal materials, such as Figure 1 As shown, the test specimen 1 includes: a cylindrical test area 101, a first fixing area 103a, and a second fixing area 103b;

[0043] One side of the cylindrical test area 101 is connected to the first fixing area 103 a , and the other side is connected to the second fixing area 103 b .

[0044] Preferably, the test specimen 1 further includes: a first diameter-reducing section 102a and a second diameter-reducing section 102b; the first diameter-reducing section 102a and the second diameter-reducing section 102b are respectively arranged at both ends of the cylindrical test area 101, the first fixed area 103a and the cylindrical test area 101 are connected by the first diameter-reducing section 102a, and the second fixed area 103b and the cylindrical test area 101 are connected by the second diameter-reducing section 102b.

[0045] Preferably, the first fixing area 103a and the second fixing area 103b may be cylinders, which are coaxially connected to the cylindrical test area 101, and the cylindrical axes of the first fixing area 103a, the second fixing area 103b and the cylindrical test area 101 are collinear;

[0046] The diameters of the first fixed area 103a and the second fixed area 103b can be the same and both larger than the cylindrical test area 101. The diameters of the first variable diameter section 102a and the second variable diameter section 102b gradually change from the diameter of the cylindrical test area 101 to the diameters of the first fixed area 103a and the second fixed area 103b.

[0047] It can be understood that the first diameter-changing section 102a and the second diameter-changing section 102b serve as transition areas for size change, which can reduce stress and avoid brittle fracture of the sample at the connection between the test area and the fixed area.

[0048] Preferably, the test specimen 1 further comprises: a third diameter-reducing section 104a and a third fixing area 106a are sequentially connected to the outside of the first fixing area 103a, and a fourth diameter-reducing section 104b and a fourth fixing area 106b are sequentially connected to the outside of the second fixing area 103b;

[0049] The diameter of the third fixed area 106a is larger than that of the first fixed area 103a, the diameter of the fourth fixed area 106b is larger than that of the second fixed area 103b, and the diameter of the third variable diameter section 104a gradually increases from the diameter of the first fixed area 103a to the third fixed area 106a; the diameter of the fourth variable diameter section 104b gradually increases from the diameter of the second fixed area 103b to the direction of the fourth fixed area 106b.

[0050] Preferably, the third fixing region 106a and the fourth fixing region 106b may have the same diameter.

[0051] During implementation, the first fixing area 103a or the third fixing area 106a of the test sample is clamped with the first clamp, and the second fixing area 103b or the fourth fixing area 106b of the test sample is clamped with the second clamp, and the cylindrical test area 101 is not in contact with the two clamps, and the two clamps are moved in opposite directions, so that the two clamps provide the test sample with two tensile forces in opposite directions.

[0052] A typical prior art test specimen 1 for high temperature tensile testing of metal materials, such as Figure 2 As shown, Figure 1 In comparison, the third diameter-reducing section 104a is connected to the outside with a first threaded connection portion 105a, and the fourth diameter-reducing section 104b is connected to the outside with a second threaded connection portion 105b;

[0053] The first threaded connection portion 105a and the second threaded connection portion 105b may be cylinders, and are coaxially and collinearly connected to the cylindrical test area 101;

[0054] The diameters of the first threaded portion 105a and the second threaded portion 105b can be the same. The diameter of the first threaded portion 105a is larger than the first fixed area 103a, and the diameter of the second threaded portion 105b is larger than the second fixed area 103b. The diameter of the third variable diameter section 104a gradually increases from the diameter of the first fixed area 103a to the diameter of the first threaded portion 105a, and the diameter of the fourth variable diameter section 104b gradually increases from the diameter of the second fixed area 103b to the diameter of the second threaded portion 105b.

[0055] During implementation, the test specimen for high temperature tensile testing of metal materials in the prior art is fixed to the clamp through the thread of the screw connection part, and thus has the following defects:

[0056] (1) When metal materials are stretched at high temperatures, the threads are easily oxidized and even diffused and connected. In addition, the specimen and threads are deformed due to the force during the stretching process, making it difficult to remove the specimen;

[0057] (2) When measuring materials with poor toughness, the threaded section is prone to breakage, resulting in the test area not breaking normally and making it impossible to obtain accurate limit data of the test area.

[0058] Compared with the prior art, the test specimen for high temperature tensile testing of metal materials of the present invention does not require a threaded portion, thereby avoiding the problem that the threaded sample is easily oxidized and deformed, which leads to difficulty in removing the sample and easy breakage of the threaded section.

[0059] On the other hand, the utility model discloses a fixture for high temperature stretching of metal materials, such as Figure 3-6c As shown, the clamp 2 includes a clamping portion 201 and a connecting portion 202, and one end of the clamping portion 201 is fixedly connected to the connecting portion 202;

[0060] Two vertically connected notches are provided on the side of the clamping portion 201 to form a first channel and a second channel 2013. The second channel 2013 forms an internal hollow structure inside the clamping portion 201, and the width of the first channel is smaller than that of the second channel 2013. The first channel passes through the top of the clamping portion 201 and is connected to the outside.

[0061] Preferably, the clamping portion 201 and the connecting portion 202 may be approximately cylindrical or cylindrical, and the two are coaxially fixedly connected.

[0062] Compared with the prior art, the utility model provides a hollow structure in the clamping part of the clamp, and two vertically connected notches are opened on the side of the clamping part to form a first channel and a second channel. The second channel forms an internal hollow structure inside the clamping part, and the width of the first channel is smaller than that of the second channel. The first channel passes through the top of the clamping part and is connected to the outside world, so that the test sample and the fixture can be conveniently engaged and fixed during the tensile test without the need for threaded connection, thereby avoiding the problem that the threaded sample is easily oxidized and deformed, which makes it difficult to remove the sample and the threaded segment is easy to break.

[0063] Specifically, the width of the first channel is greater than the diameter a1 of the cylindrical test area 101, and the width of the first channel is less than the diameter a2 of the first fixing area 103a, and the width of the second channel 2013 is greater than the diameter a3 of the third fixing area 106a.

[0064] During implementation, taking the first fixed area 103a end of the test sample 1 fixedly connected to the fixture 2 as an example, the test sample 1 for high temperature tensile testing of metal materials is translated in a direction parallel to the axial direction of the clamping part 201, and partially enters the hollow structure inside the clamping part 201:

[0065] The cylindrical test area 101 partially enters the hollow structure inside the clamping part 201 through the first channel, and another part of the cylindrical test area 101 always protrudes from the top plane of the clamping part 201;

[0066] The first fixing area 103a and the third fixing area 106a completely enter the hollow structure inside the clamping portion 201 through the second channel 2013;

[0067] The test sample 1 is translated until its axis coincides with the axis of the clamping portion 201, and an axial tension is applied to the test sample 1 for a tensile test. The test sample 1 and the axis of the clamping portion 201 are relatively displaced. Since the width of the first channel is greater than the diameter of the cylindrical test area 101 and less than the diameter of the first fixed area 103a, the first fixed area 103a is engaged in the hollow structure inside the clamping portion 201, so that the test sample 1 is engaged and fixed with the fixture 2 during the tensile test. At the same time, since the width of the first channel is greater than the diameter a1 of the cylindrical test area 101, the cylindrical test area 101 is not completely in contact with the clamping portion 201 during the tensile test, and thus the test area is only subjected to an axial force, meeting the requirements of the tensile test.

[0068] It should be noted that, since the width of the first channel is larger than the diameter of the cylindrical test area 101 and smaller than the diameter of the first fixed area 103a, and the diameter of the first variable diameter section 102a gradually changes from the diameter of the cylindrical test area 101 to the diameter of the first fixed area 103a, the test sample 1 is actually engaged with the lower edge of the first channel through the first variable diameter section 102a until its axis coincides with the axis of the clamping portion 201.

[0069] It can be understood that the fixing area of ​​the test sample is symmetrically arranged relative to the test area, and the fixing connection between the end of the second fixing area 103b and the fixture 2 is exactly the same as the fixing connection between the end of the first fixing area 103a and the fixture 2.

[0070] Preferably, if Figure 3As shown, in order to improve the engagement stability between the clamping portion 201 and the test sample 1 , the first channel is provided with a circular through hole 2011 parallel to the stretching direction near the center of the clamping portion 201 , and a first connecting channel 2012 is provided between the circular through hole 2011 and the side of the clamping portion 201 .

[0071] During implementation, the first connecting channel 2012 serves as a translation channel for the cylindrical test area 101 in the test sample 1, and the circular through hole 2011 serves as a positioning area when the axis of the test sample 1 coincides with the axis of the clamping portion 201. Since the lower edge of the circular through hole 2011 is arc-shaped, it is more stable and the force is more evenly applied when engaged with the first variable diameter section 102a.

[0072] Specifically, the diameter d1 of the circular through hole 2011 is greater than or equal to the width w1 of the first communication channel 2012 , and d1 is less than the diameter a2 of the first fixing area 103 a .

[0073] A feasible embodiment is as follows: Figure 5a As shown, the diameter d1 of the circular through hole 2011 is greater than the width w1 of the first connecting channel 2012 .

[0074] Another feasible embodiment, such as Figure 5b As shown, the diameter d1 of the circular through hole 2011 is equal to the width w1 of the first connecting channel 2012 .

[0075] Specifically, Figure 6a-6c As shown, the second channel 2013 may be a through hole penetrating the side of the clamping portion 201 or a through hole connecting the inner hollow structure of the clamping portion 201 with the outside.

[0076] A feasible embodiment is as follows: Figure 6a As shown, the second channel 2013 is a through hole penetrating the side of the clamping portion 201 , which itself constitutes a hollow structure inside the clamping portion 201 , and the width of the through hole is greater than the diameter a3 of the third fixing area 106a .

[0077] Another feasible embodiment, such as Figure 6b , 6c As shown, the second channel 2013 is provided with a circular chamber 2013 b in the central area near the clamping portion 201 , and a second connecting channel 2013 a is provided between the circular chamber 2013 b and the side surface of the clamping portion 201 .

[0078] During implementation, the second connecting channel 2013a serves as a translation channel for the first fixed area 103a or the second fixed area 103b in the test sample 1. When the axis of the test sample 1 coincides with the axis of the clamping portion 201, the test sample 1 is engaged with the clamping portion 201, and the circular chamber 2013b serves as a placement area for the first fixed area 103a or the second fixed area 103b.

[0079] Specifically, the diameter d2 of the circular chamber 2013b is ≥ the width w2 of the second communication channel 2013a, and the width w2 of the second communication channel 2013a is greater than the diameter a3 of the third fixing area 106a.

[0080] A specific embodiment, such as Figure 6b As shown, the diameter d2 of the circular chamber 2013b is greater than the width w2 of the second connecting channel 2013a.

[0081] Another specific embodiment, such as Figure 6c As shown, the diameter d2 of the circular chamber 2013b is equal to the width w2 of the second connecting channel 2013a.

[0082] In order to better illustrate the present invention, the following embodiments are provided:

[0083] Example 1

[0084] The utility model discloses a clamp for high temperature stretching of metal materials, such as Figure 3 , Figure 4 , Figure 5a , Figure 6a As shown, the clamp 2 includes a clamping portion 201 and a connecting portion 202, and one end of the clamping portion 201 is fixedly connected to the connecting portion 202;

[0085] The clamping part 201 includes a clamping part body 2014, and two vertically connected notches are opened on the side of the clamping part body 2014 to form a first channel and a second channel 2013. The second channel 2013 forms an internal hollow structure inside the clamping part 201, and the width of the first channel is smaller than the second channel 2013. The first channel passes through the top of the clamping part 201 and is connected to the outside.

[0086] The clamping portion 201 and the connecting portion 202 are cylindrical and are coaxially fixedly connected.

[0087] The cylindrical test area 101 partially enters the hollow structure inside the clamping part 201 through the first channel, and another part of the cylindrical test area 101 always protrudes from the top plane of the clamping part 201;

[0088] The first fixing area 103a and the third fixing area 106a completely enter the hollow structure inside one fixture clamping part 201 through the second channel 2013; the second fixing area 103b and the fourth fixing area 106b completely enter the hollow structure inside the other fixture clamping part 201 through the second channel 2013;

[0089] The test sample 1 is translated until its axis coincides with the axis of the clamping portion 201, and an axial tension is applied to the test sample 1 for a tensile test. The test sample 1 and the axis of the clamping portion 201 are relatively displaced. Since the width of the first channel is greater than the diameter of the cylindrical test area 101 and less than the diameter of the first fixed area 103a, the first fixed area 103a is engaged in the hollow structure inside the clamping portion 201, so that the test sample 1 is engaged and fixed with the fixture 2 during the tensile test. At the same time, since the width of the first channel is greater than the diameter a1 of the cylindrical test area 101, the cylindrical test area 101 is not completely in contact with the clamping portion 201 during the tensile test, and thus the test area is only subjected to an axial force, meeting the requirements of the tensile test.

[0090] The first channel is provided with a circular through hole 2011 in a central area near the clamping portion 201 , and a first connecting channel 2012 is provided between the circular through hole 2011 and the side surface of the clamping portion 201 .

[0091] During implementation, the first connecting channel 2012 serves as a translation channel for the cylindrical test area 101 in the test sample 1, and the circular through hole 2011 serves as a positioning area when the axis of the test sample 1 coincides with the axis of the clamping portion 201. Since the lower edge of the circular through hole 2011 is arc-shaped, it is more stable and the force is more evenly applied when engaged with the first variable diameter section 102a.

[0092] The diameter d1 of the circular through hole 2011 is greater than the width w1 of the first connecting channel 2012 .

[0093] The second channel 2013 is a through hole penetrating the side surface of the clamping portion 201 , and the second channel 2013 is a through hole penetrating the side surface of the clamping portion 201 , and itself constitutes a hollow structure inside the clamping portion 201 .

[0094] Example 2

[0095] The utility model discloses a clamp for high temperature stretching of metal materials, such as Figure 4 , Figure 5b , Figure 6b As shown, the clamp 2 includes a clamping portion 201 and a connecting portion 202, and one end of the clamping portion 201 is fixedly connected to the connecting portion 202;

[0096] The clamping part 201 includes a clamping part body 2014, and two vertically connected notches are opened on the side of the clamping part body 2014 to form a first channel and a second channel 2013. The second channel 2013 forms an internal hollow structure inside the clamping part 201, and the width of the first channel is smaller than the second channel 2013. The first channel passes through the top of the clamping part 201 and is connected to the outside.

[0097] The clamping portion 201 and the connecting portion 202 are cylindrical and are coaxially fixedly connected.

[0098] The width of the first channel is greater than the diameter a1 of the cylindrical test area 101 , and the width of the first channel is less than the diameter a2 of the first fixing area 103 a ; the width of the second channel 2013 is greater than the diameter a2 of the first fixing area 103 a .

[0099] During implementation, taking the first fixed area 103a end of the test sample 1 fixedly connected to the fixture 2 as an example, the test sample 1 for high temperature tensile testing of metal materials is translated in a direction parallel to the axial direction of the clamping part 201, and partially enters the hollow structure inside the clamping part 201:

[0100] The cylindrical test area 101 partially enters the hollow structure inside the clamping part 201 through the first channel, and another part of the cylindrical test area 101 always protrudes from the top plane of the clamping part 201;

[0101] The first fixing area 103a and the third fixing area 106a completely enter the hollow structure inside one fixture clamping part 201 through the second channel 2013; the second fixing area 103b and the fourth fixing area 106b completely enter the hollow structure inside the other fixture clamping part 201 through the second channel 2013;

[0102] The test sample 1 is translated until its axis coincides with the axis of the clamping portion 201, and an axial tension is applied to the test sample 1 for a tensile test. The test sample 1 and the axis of the clamping portion 201 are relatively displaced. Since the width of the first channel is greater than the diameter of the cylindrical test area 101 and less than the diameter of the first fixed area 103a, the first fixed area 103a is engaged in the hollow structure inside the clamping portion 201, so that the test sample 1 is engaged and fixed with the fixture 2 during the tensile test. At the same time, since the width of the first channel is greater than the diameter a1 of the cylindrical test area 101, the cylindrical test area 101 is not completely in contact with the clamping portion 201 during the tensile test, and thus the test area is only subjected to an axial force, meeting the requirements of the tensile test.

[0103] The first channel is provided with a circular through hole 2011 in a central area near the clamping portion 201 , and a first connecting channel 2012 is provided between the circular through hole 2011 and the side surface of the clamping portion 201 .

[0104] During implementation, the first connecting channel 2012 serves as a translation channel for the cylindrical test area 101 in the test sample 1, and the circular through hole 2011 serves as a positioning area when the axis of the test sample 1 coincides with the axis of the clamping portion 201. Since the lower edge of the circular through hole 2011 is arc-shaped, it is more stable and the force is more evenly applied when engaged with the first variable diameter section 102a.

[0105] The diameter d1 of the circular through hole 2011 is equal to the width w1 of the first connecting channel 2012 .

[0106] The second channel 2013 is provided with a circular chamber 2013 b in a central area near the clamping portion 201 , and a second connecting channel 2013 a is provided between the circular chamber 2013 b and the side surface of the clamping portion 201 .

[0107] The diameter d2 of the circular chamber 2013b is greater than the width w2 of the second connecting channel 2013a.

[0108] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A fixture for high temperature drawing of metal materials, characterized in that: include: A clamping portion and a connecting portion; The clamping portion is fixedly connected to one end of the connecting portion; The side of the clamping portion is provided with two vertically connected notches to form a first channel and a second channel, wherein the second channel forms an internal hollow structure inside the clamping portion, and the width of the first channel is smaller than that of the second channel; The first channel passes through the top of the clamping portion and communicates with the outside.

2. A fixture for high temperature drawing of metal materials according to claim 1, characterized in that: The clamping portion and the connecting portion are approximately cylindrical or cylindrical, and the two are coaxially fixedly connected.

3. A fixture for high temperature drawing of metal materials according to claim 2, characterized in that: A test specimen for high temperature tensile testing of metal materials, the test specimen comprising: a cylindrical test area, a first fixing area, and a second fixing area; One side of the cylindrical test area is connected to the first fixing area, and the other side is connected to the second fixing area; A third diameter-reducing section and a third fixing area are sequentially connected to the outside of the first fixing area; The width of the first channel is greater than the diameter a1 of the cylindrical test area, and the width of the first channel is less than the diameter a2 of the first fixing area, and the width of the second channel is greater than the diameter a3 of the third fixing area.

4. A fixture for high temperature drawing of metal materials according to claim 3, characterized in that: The first channel is provided with a circular through hole parallel to the stretching direction in a central area near the clamping portion.

5. A fixture for high temperature drawing of metal materials according to claim 4, characterized in that: A first communication channel is provided between the circular through hole and the side surface of the clamping portion.

6. A fixture for high temperature drawing of metal materials according to claim 5, characterized in that: The diameter d1 of the circular through hole, the width w1 of the first connecting channel, and the diameter a2 of the first fixing area satisfy: w1≤d1<a2.

7. A fixture for high temperature drawing of metal materials according to any one of claims 1 to 6, characterized in that: The second channel is a through hole penetrating the side of the clamping portion or a through hole connecting the hollow structure and the outside of the clamping portion.

8. A fixture for high temperature drawing of metal materials according to claim 7, characterized in that: The second channel is provided with a circular chamber near the center area of ​​the clamping portion, and a second communicating channel is provided between the circular chamber and the side surface of the clamping portion.

9. A fixture for high temperature drawing of metal materials according to claim 8, characterized in that: The diameter d2 of the circular chamber and the width w2 of the second connecting channel satisfy: d2≥w2.

10. A fixture for high temperature drawing of metal materials according to claim 7, characterized in that: The second channel is a through hole penetrating through the side surface of the clamping portion, and the second channel constitutes a hollow structure inside the clamping portion.

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