Tensile strength testing device

Abstract

The utility model relates to a tensile strength testing device which comprises a stretching mechanism and a heating mechanism, the stretching mechanism comprises a first clamp and a second clamp, the first clamp and the second clamp are arranged at intervals in the height direction, and the heating mechanism comprises a power source and an induction heating coil. The induction heating coils are arranged between the first clamp and the second clamp at intervals in the height direction, and the power supply is electrically connected with the induction heating coils; according to the tensile strength testing device, the sample is clamped by the first clamp and the second clamp of the stretching mechanism, and the induction heating coil is powered by the power supply of the heating mechanism, so that the induction heating coil heats the sample between the first clamp and the second clamp, and compared with resistance heating, the electromagnetic induction heating speed is higher; compared with a resistance furnace, the heating mechanism with the power supply and the induction heating coil is simple in structure and smaller in occupied space, the distance between the induction heating coil and the sample is closer, the heating efficiency can be further improved, and then the test efficiency is improved.

Description

Technical Field

[0001] This application relates to the technical field of automotive component test devices, and particularly to a tensile strength test device. Background Art

[0002] With the increasing requirements of the country for automotive lightweighting, energy conservation and emission reduction, and collision safety, ultra-high strength steel and aluminum alloy hot forming technologies have been more widely used in automotive manufacturing.

[0003] In order to more accurately complete the process analysis of ultra-high strength steel and aluminum alloy hot forming, it is necessary to conduct tensile tests on materials at different temperatures and different strain rates, so as to establish a constitutive model for the forming of materials under warm and high-speed conditions. Currently, conventional test devices include a normal temperature tensile test equipment and a resistance furnace. The resistance furnace is installed around the normal temperature tensile test equipment and can heat the specimen and the chuck of the normal temperature tensile test equipment to assist the normal temperature tensile test equipment in conducting tensile tests on the specimen.

[0004] However, this kind of test device has a complex structure, occupies a large area, and the heating speed of the resistance furnace for the specimen is slow, resulting in low test efficiency. Utility Model Content

[0005] Based on this, in view of the above problems of large occupied area and low test efficiency, it is necessary to provide a tensile strength test device.

[0006] A tensile strength test device includes:

[0007] A tensile mechanism, including a first fixture and a second fixture, the first fixture and the second fixture are arranged at intervals in the height direction;

[0008] A heating mechanism, including a power supply and an induction heating coil, the induction heating coil is arranged at intervals in the height direction between the first fixture and the second fixture, and the power supply is electrically connected to the induction heating coil.

[0009] In one embodiment, the first chuck has a first clamping portion facing the second fixture, the second chuck has a second clamping portion facing the first fixture, the induction heating coil has a coil portion with a ring structure, and the axis of the coil portion coincides with the connection line between the first clamping portion and the second clamping portion.

[0010] In one embodiment, the induction heating coil includes a lead portion and a coil portion, the coil portion is arranged at intervals in the height direction between the first fixture and the second fixture, and the coil portion has a circular ring structure or a square ring structure, and the lead portion connects the power supply and the coil portion.

[0011] In one embodiment, the distance between the coil part and the first fixture is the same as the distance between the coil part and the second fixture.

[0012] In one embodiment, the first fixture includes a first chuck and a first fixing member. A first fixing groove is provided on the side surface of the first chuck facing the second fixture. The first fixing member is arranged on the first chuck, and a part of the first fixing member is located in the first fixing groove.

[0013] In one embodiment, the first fixing member penetrates through the first chuck.

[0014] In one embodiment, the first fixing groove is formed on the first side surface of the first chuck. The first chuck further has two second side surfaces perpendicular to the first side surface. The two second side surfaces face away from each other, and the first fixing groove penetrates through the two second side surfaces.

[0015] In one embodiment, the second fixture includes a second chuck and a second fixing member. A second fixing groove is provided on the side surface of the second chuck facing the first fixture. The second fixing member is arranged on the second chuck, and a part of the second fixing member is located in the second fixing groove.

[0016] In one embodiment, the second fixing member penetrates through the second chuck.

[0017] In one embodiment, the second fixing groove is formed on the third side surface of the second chuck. The second chuck further has two fourth side surfaces perpendicular to the third side surface. The two fourth side surfaces face away from each other, and the second fixing groove penetrates through the two fourth side surfaces.

[0018] For the above-mentioned tensile strength test device, the specimen is clamped by the first fixture and the second fixture of the stretching mechanism, and the induction heating coil is powered by the power supply of the heating mechanism, so that the induction heating coil heats the specimen between the first fixture and the second fixture. Compared with resistance heating, the electromagnetic induction heating speed is faster. And compared with a resistance furnace, the heating mechanism with a power supply and an induction heating coil has a simple structure, occupies less space, the distance between the induction heating coil and the specimen is closer, which can further improve the heating efficiency and thus improve the test efficiency. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the tensile strength test device according to some embodiments of the present application.

[0020] Figure 2 It is a schematic structural diagram between the tensile strength test device according to some embodiments of the present application and the specimen.

[0021] Figure 3 Structural schematic diagram of the tensile strength test device for some other embodiments of the present application.

[0022] Figure 4 Structural schematic diagram between the tensile strength test device and the specimen for some other embodiments of the present application.

[0023] Reference numerals:

[0024] 1. Tensile mechanism;

[0025] 11. First fixture; 111. First chuck; 112. First fixing member; 113. First fixing groove;

[0026] 12. Second fixture; 121. Second chuck; 122. Second fixing member; 123. Second fixing groove;

[0027] 2. Heating mechanism;

[0028] 21. Power supply;

[0029] 22. Induction heating coil; 221. Lead portion; 222. Coil portion;

[0030] 3. Specimen. Detailed implementation manners

[0031] To make the above objects, features, and advantages of the present application more apparent and understandable, the following will describe the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0033] In addition, if the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this application, unless otherwise clearly specified and defined, if terms such as "installed", "connected", "joined", "fixed", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, the meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", and "on top of" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath", and "underneath" the second feature can be that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0037] In order to more accurately complete the process analysis of hot forming of ultra-high strength steel and aluminum alloy, it is necessary to conduct tensile tests on the materials at different temperatures and different strain rates, so as to construct a constitutive model for the forming of materials under warm and high-speed conditions. Currently, conventional tensile strength test devices include room-temperature tensile test equipment and a resistance furnace. The room-temperature tensile test equipment is used to clamp the specimen, and the resistance furnace is installed around the room-temperature tensile test equipment to heat the specimen and the chuck of the room-temperature tensile test equipment, so as to assist the room-temperature tensile test equipment to complete the tensile test of the specimen more quickly.

[0038] However, the test device structure including the room-temperature tensile test equipment and the resistance furnace is complex, occupies a large area, and the heating speed of the resistance furnace for the specimen is slow. It takes a long time to raise the temperature above the specified temperature (800 °C), resulting in low test efficiency. Based on this, there is an urgent need for a tensile strength test device with a simple structure, small occupied area, and fast heating speed to solve the deficiencies of the existing test devices.

[0039] Refer to Figure 1 and Figure 2 In one embodiment of the present application, a tensile strength test device is provided, including a tensile mechanism 1 and a heating mechanism 2. Among them, the tensile mechanism 1 is used to clamp and stretch the specimen 3. The heating mechanism 2 is used to heat the specimen 3 to assist the tensile mechanism 1 to complete the tensile test of the specimen 3 more quickly.

[0040] Specifically, the tensile mechanism 1 includes a first fixture 11 and a second fixture 12, and the first fixture 11 and the second fixture 12 are spaced apart along the height direction. After the specimen 3 is placed between the first fixture 11 and the second fixture 12, the first fixture 11 and the second fixture 12 can respectively clamp the two ends of the specimen 3 along the height direction, so that the tensile mechanism 1 can perform subsequent stretching operations. More specifically, the tensile mechanism 1 further includes a mechanical tensile tester and a base, and the mechanical tensile tester and the base are spaced apart along the height direction. The first fixture 11 is arranged on the mechanical tensile tester, and the second fixture 12 is arranged on the base. After the two ends of the specimen 3 along the height direction are respectively clamped by the first fixture 11 and the second fixture 12, the mechanical tensile tester can drive the first fixture 11 to move in a direction away from the second fixture 12 along the height direction, so that the specimen 3 is stretched.

[0041] The heating mechanism 2 includes a power supply 21 and an induction heating coil 22. The power supply 21 is electrically connected to the induction heating coil 22, so that the power supply 21 can supply power to the induction heating coil 22 to make the induction heating coil 22 generate heat. The induction heating coil 22 is spaced apart along the height direction between the first fixture 11 and the second fixture 12 to surround the specimen 3 located between the first fixture 11 and the second fixture 12, so that the induction heating coil 22 can heat the specimen 3 when it generates heat.

[0042] When the tensile strength test device of the present application is in use, the mechanical stretcher can first drive the first clamp 11 to move in the height direction away from the second clamp 12, so that there is a sufficiently large space between the first clamp 11 and the induction heating coil 22. Then, one end of the specimen 3 is inserted into the induction heating coil 22 through this space, so that one end of the specimen 3 can gradually move onto the second clamp 12 and be clamped by the second clamp 12. Then, the mechanical stretcher can drive the first clamp 11 to move in the height direction towards the second clamp 12, so that the other end of the specimen 3 can contact the first clamp 11 and be clamped by the first clamp 11. Then, the induction heating coil 22 is powered by the power supply 21, so that the induction heating coil 22 heats the specimen 3, and after heating to the specified temperature, the mechanical stretcher is controlled to drive the first clamp 11 to move in the height direction away from the second clamp 12 to stretch the specimen 3.

[0043] In summary, for the tensile strength test device of the present application, the specimen 3 is clamped by the first clamp 11 and the second clamp 12 of the stretching mechanism 1, and the induction heating coil 22 is powered by the power supply 21 of the heating mechanism 2, so that the induction heating coil 22 heats the specimen 3 between the first clamp 11 and the second clamp 12. Compared with resistance heating, the electromagnetic induction heating speed is faster, and compared with a resistance furnace, the heating mechanism 2 with the power supply 21 and the induction heating coil 22 has a simple structure, occupies less space, and the distance between the induction heating coil 22 and the specimen 3 is closer, which can further improve the heating efficiency and thus improve the test efficiency.

[0044] Refer to Figure 1 and Figure 2 In one embodiment, the first chuck 111 has a first clamping portion facing the second clamp 12, the second chuck 121 has a second clamping portion facing the first clamp 11, the induction heating coil 22 has a coil portion 222 with an annular structure, and the axis of the coil portion 222 coincides with the connection line between the first clamping portion and the second clamping portion, so that the specimen 3 can pass through the coil portion 222 well and be connected to the first clamp 11 and the second clamp 12.

[0045] Specifically, the first chuck 111 has a first side facing the second clamp 12, the second chuck 121 has a third side facing the first clamp 11. The outer contours of the first side and the third side are both circular, and the axis of the first side coincides with the axis of the third side. The axis of the coil portion 222 coincides with the axis of the first side and the axis of the third side. The first clamping portion is arranged in the middle of the first side, the second clamping portion is arranged in the middle of the third side, and the connection line between the first clamping portion and the second clamping portion coincides with the axis of the coil portion 222. When the specimen 3 passes through the coil portion 222 and is fixed on the first clamp 11 and the second clamp 12, the axis of the coil portion 222 passes through the specimen 3.

[0046] In one embodiment, the induction heating coil 22 includes a lead portion 221 and a coil portion 222. The lead portion 221 connects the power supply 21 and the coil portion 222, so that the power supply 21 supplies power to the coil portion 222 through the lead portion 221. The coil portion 222 is disposed at intervals in the height direction between the first fixture 11 and the second fixture 12, so that the coil portion 222 heats the specimen 3 between the first fixture 11 and the second fixture 12. The coil portion 222 has a circular ring structure or a square ring structure, so that the specimen 3 can pass through the coil portion 222 and be connected to the first fixture 11 and the second fixture 12. Specifically, referring to Figure 1 and Figure 2 , in one embodiment, the coil portion 222 has a circular ring structure, and the axis of the coil portion 222 coincides with the line connecting the first clamping portion and the second clamping portion. Referring to Figure 3 and Figure 4 , in another embodiment, the coil portion 222 has a square ring structure, and the center line of the coil portion 222 coincides with the line connecting the first clamping portion and the second clamping portion.

[0047] More specifically, the distance between the coil portion 222 and the first fixture 11 is the same as the distance between the coil portion 222 and the second fixture 12. After the first fixture 11 and the second fixture 12 clamp and fix the two ends of the specimen 3 respectively, the coil portion 222 can uniformly heat the specimen 3.

[0048] Referring to Figure 1 and Figure 3 , in one embodiment, the first fixture 11 includes a first chuck 111 and a first fixing member 112. A first fixing groove 113 is provided on the side of the first chuck 111 facing the second fixture 12, and the first fixing groove 113 can provide a fixing space for the end of the specimen 3. The first fixing member 112 is disposed on the first chuck 111, and a part of the first fixing member 112 is located in the first fixing groove 113, and the end of the specimen 3 located in the first fixing groove 113 is fixed by the first fixing member 112.

[0049] Specifically, the outer contour of the cross-section of the first chuck 111 perpendicular to the height direction is circular, so that the coil portion 222 and the first fixture 11 are coaxially arranged. The first fixing member 112 penetrates through the first chuck 111 to enhance the fixing effect on the specimen 3. More specifically, the first chuck 111 can be made of a high-temperature-resistant carbon-ceramic material, the first fixing member 112 can be made of a metal material, and the first fixing member 112 is a pin.

[0050] Referring to Figure 1 and Figure 2, in one embodiment, the first fixing groove 113 is formed on the first side surface of the first chuck 111. The first chuck 111 further has two second side surfaces perpendicular to the first side surface, the two second side surfaces face away from each other, and the first fixing groove 113 penetrates through the two second side surfaces. This structure enables the end portion of the specimen 3 to penetrate through the two second side surfaces of the first chuck 111 after being inserted into the first fixing groove 113, so that the first chuck 111 can have a smaller volume while achieving the fixing effect on the specimen 3, thereby saving the occupied space.

[0051] In one embodiment, the second fixture 12 includes a second chuck 121 and a second fixing member 122. A second fixing groove 123 is provided on the side surface of the second chuck 121 facing the first fixture 11, and the second fixing groove 123 can provide a fixing space for the end portion of the specimen 3. The second fixing member 122 is arranged on the second chuck 121, and a part of the second fixing member 122 is located in the second fixing groove 123, and the end portion of the specimen 3 located in the second fixing groove 123 is fixed by the second fixing member 122..

[0052] Specifically, the outer contour of the cross-section of the second chuck 121 perpendicular to the height direction is circular, so that the coil portion 222 is coaxially arranged with the second fixture 12. The second fixing member 122 penetrates through the second chuck 121 to enhance the fixing effect on the specimen 3. More specifically, the second chuck 121 can be made of a high-temperature-resistant carbon-ceramic material, the second fixing member 122 can be made of a metal material, and the second fixing member 122 is a pin.

[0053] Refer to Figure 1 and Figure 2 , in one embodiment, the second fixing groove 123 is formed on the third side surface of the second chuck 121. The second chuck 121 further has two fourth side surfaces perpendicular to the third side surface, the two fourth side surfaces face away from each other, and the second fixing groove 123 penetrates through the two fourth side surfaces. This structure enables the end portion of the specimen 3 to penetrate through the two fourth side surfaces of the second chuck 121 after being inserted into the second fixing groove 123, so that the second chuck 121 can have a smaller volume while achieving the fixing effect on the specimen 3, thereby saving the occupied space.

[0054] In summary, when the tensile strength test device of the present application is in use, the specimen 3 can be threaded through the coil portion 222, and both ends of the specimen 3 are respectively inserted into the first fixing groove 113 and the second fixing groove 123, and the specimen 3 is fixed to the first fixture 11 and the second fixture 12 through the first fixing member 112 and the second fixing member 122. Then, the coil portion 222 is powered by the power supply 21, so that the coil portion 222 heats the specimen 3, and after heating to the specified temperature, the mechanical stretcher is controlled to drive the first fixture 11 to move away from the second fixture 12 in the height direction to stretch the specimen 3. After the specimen 3 is broken, the power supply 21 to the coil portion 222 is stopped, and then the data is recorded and the specimen 3 is removed.

[0055] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0056] The above-described embodiments only represent several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A tensile strength test device, characterized in that, Comprising: A stretching mechanism, including a first fixture and a second fixture, the first fixture and the second fixture being arranged at intervals in the height direction; A heating mechanism, including a power source and an induction heating coil, the induction heating coil being arranged at intervals in the height direction between the first fixture and the second fixture, the power source being electrically connected to the induction heating coil.

2. The tensile strength test device according to claim 1, characterized in that, The first chuck has a first clamping portion facing the second fixture, the second chuck has a second clamping portion facing the first fixture, the induction heating coil has a coil portion in a ring structure, and the axis of the coil portion coincides with the connection line between the first clamping portion and the second clamping portion.

3. The tensile strength test device according to claim 1, wherein, The induction heating coil includes a lead portion and a coil portion, the coil portion being arranged at intervals in the height direction between the first fixture and the second fixture, and the coil portion being in a circular ring structure or a square ring structure, the lead portion connecting the power source and the coil portion.

4. The tensile strength test device according to claim 3, characterized in that, The distance between the coil portion and the first fixture is the same as the distance between the coil portion and the second fixture.

5. The tensile strength test device according to claim 1, wherein, The first fixture includes a first chuck and a first fixing member, a first fixing groove is provided on the side surface of the first chuck facing the second fixture, the first fixing member is arranged on the first chuck, and a part of the first fixing member is located in the first fixing groove.

6. The tensile strength test device according to claim 5, characterized in that, The first fixing member penetrates through the first chuck.

7. The tensile strength test device according to claim 5, characterized in that, The first fixing groove is opened on the first side surface of the first chuck, the first chuck further has two second side surfaces perpendicular to the first side surface, the two second side surfaces face away from each other, and the first fixing groove penetrates through the two second side surfaces.

8. The tensile strength test device according to claim 1, characterized in that, The second fixture includes a second chuck and a second fixing member, a second fixing groove is provided on the side surface of the second chuck facing the first fixture, the second fixing member is arranged on the second chuck, and a part of the second fixing member is located in the second fixing groove.

9. The tensile strength test device according to claim 8, wherein, The second fixing member penetrates through the second chuck.

10. The tensile strength test device according to claim 8, characterized in that, The second fixing groove is opened on the third side surface of the second chuck, the second chuck further has two fourth side surfaces perpendicular to the third side surface, the two fourth side surfaces face away from each other, and the second fixing groove penetrates through the two fourth side surfaces.

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