A fixture for testing the pull-out force of metal wire

Abstract

The present invention discloses a fixture for testing the pulling force of a metal wire, which belongs to the field of tooling for testing the pulling force, and includes a frame, a clamping portion, a first limiting cylinder, and a second limiting cylinder. The present invention sets an opening on the front side of the frame so that the frame has an open space inside, so that the first limiting cylinder and the second limiting cylinder for limiting the drawing die can be set, and a container storing lubricating liquid can also be placed in the frame, so that the lubricating liquid in the container completely immerses the liquid through hole, and flows into the first limiting cylinder from the liquid through hole, ensuring that there is always lubricating liquid at the outlet end of the drawing die, and the lubricating liquid at the outlet end of the drawing die is in the main phase, which can be replaced with the lubricating liquid in the container in real time, thereby ensuring that the state of the drawing die immersed in the lubricating liquid during the test is closer to the state of the die and the metal wire immersed in the lubricating liquid during the actual production drawing process, thereby accurately obtaining the pulling force test results and evaluating the performance of the lubricating liquid.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling for pulling force testing, and in particular to a fixture for pulling force testing of a metal wire. Background Art

[0002] Wet drawing is a key step in the production of metal wires such as copper wire, aluminum wire, copper cord, and stainless steel wire. Typically, in a drawing fluid environment with lubricating properties, a larger diameter raw metal wire, as it moves along its axial direction, is restricted by multiple rigid dies with increasingly smaller apertures, undergoing plastic deformation in successive passes, resulting in a smaller diameter (up to 0.01mm) metal wire product. During the wet drawing process, the lubricating properties of the working fluid reduce friction between the metal wire and the rigid (drawing) die during plastic deformation, reduce die wear on the metal wire, and remove heat generated during the plastic deformation of the metal wire. This is key to ensuring the smooth progress of the wet drawing process. Therefore, effectively evaluating the lubricating properties of the working fluid during the wet drawing process is crucial, and this is typically achieved by evaluating the pullout force of the metal wire.

[0003] In actual production, the mold is located inside a lubricating liquid environment, and the traction force is generated by the rotation of the finished I-spool to drive the winding of the steel wire product. Therefore, it is difficult to set up sensors to monitor the pulling force. The error in estimating the pulling force by the power change required by the wire drawing machine to maintain the drawing process parameters is large. Therefore, the testing of metal wire pulling force is mostly carried out in laboratories with specific testing conditions.

[0004] However, the tensile testing of mechanical testing machines in laboratories is mostly targeted at solid materials. Testing the pull-out force in a liquid environment with a lubricant requires the installation of a specific mold or fixture. In response to this, Chinese patent publication CN207147881U discloses a fixture for testing the pull-out force of steel wires. This fixture features a hollow cavity structure with a lubricant storage tank at the bottom, which can directly simulate the actual wire drawing process on a mechanical testing machine. However, this fixture makes it difficult to replace the drawing fluid, and there is no lubricant replenishment at the mold outlet during the drawing process. Consequently, the contact between the mold and the metal wire and the lubricant is limited, significantly different from the actual state of the mold and metal wire being immersed in the lubricant during the drawing process.

[0005] In addition, lubricant will flow out from the bottom of the above-mentioned clamp. Even if a lubricant collecting tank is placed directly below the clamp, a perforation needs to be set at the bottom of the lubricant collecting tank to allow the steel wire to pass through the lubricant collecting tank, so it is still impossible to prevent the lubricant from penetrating into the tensile testing machine.

[0006] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0007] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a fixture for testing the pull-out force of metal wires, aiming to solve the problems existing in the disclosed fixture for testing the pull-out force of steel wires, such as the lack of lubricant replenishment at the die outlet during the drawing process, the large gap between the state of the die and the metal wire immersed in the lubricant during the actual drawing process, and the difficulty in accurately obtaining the pull-out force test results.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions.

[0009] A fixture for testing the pull-out force of a metal wire, comprising:

[0010] The frame has an opening on the front side and a wiring hole on the top of the frame.

[0011] The clamping portion is provided at the bottom of the frame,

[0012] The first limiting cylinder is vertically arranged in the frame and connected to the inner top of the frame, and the axial direction of the first limiting cylinder is in the same straight line as the axial direction of the wiring hole.

[0013] a second limiting cylinder, the second limiting cylinder being coaxially sleeved on the outside of the first limiting cylinder, and having a first liquid hole in communication with the interior of the first limiting cylinder;

[0014] Among them, the clamping part is used for clamping by the lower chuck of the mechanical testing machine; the interior of the second limiting cylinder is used to accommodate the drawing die blocked by the first limiting cylinder, and a space for placing a container is formed between the lower end of the second limiting cylinder and the inner bottom of the frame; the wiring hole is used to allow the metal wire passed through the drawing die to pass upward through the frame, and the container stores the lubricating liquid that flows into the interior of the first limiting cylinder through the first liquid hole during testing.

[0015] Furthermore, the inner diameter of the second limiting cylinder is larger than the outer diameter of the first limiting cylinder, and the second limiting cylinder is connected to the inner top of the frame; the first limiting cylinder is provided with a second liquid hole corresponding to the first liquid hole and connected to the first liquid hole.

[0016] Furthermore, the second limiting cylinder is sleeved on the outer wall of the first limiting cylinder, and the first liquid hole passes through both the second limiting cylinder and the first limiting cylinder.

[0017] Furthermore, a plurality of the first liquid holes are distributed on the second limiting cylinder along the circumference of the second limiting cylinder.

[0018] Furthermore, the thickness S1 of the first limiting cylinder is ≥8 mm, and the thickness S2 of the second limiting cylinder is ≥8 mm.

[0019] Furthermore, the length L1 of the first limiting cylinder is ≥20 mm.

[0020] Furthermore, a difference ΔL between the length L2 of the second limiting cylinder and the length L1 of the first limiting cylinder is ≥10 mm, and the length L2 of the second limiting cylinder is less than or equal to twice the inner diameter of the second limiting cylinder.

[0021] Furthermore, the diameter D1 of the first liquid-passing hole is less than or equal to 50% of the length L1 of the first limiting cylinder.

[0022] Furthermore, the diameter D2 of the second liquid through hole is less than or equal to 50% of the length L1 of the first limiting cylinder, and the diameter D2 of the second liquid through hole is equal to the diameter D1 of the first liquid through hole.

[0023] Furthermore, the metal wire pull-out force test fixture further comprises:

[0024] A support plate, the support plate is movably arranged above the inner bottom of the frame,

[0025] At least two support rods, at least two of which are arranged at the bottom of the support plate, and the support rods are movably connected to the bottom of the frame,

[0026] a nut, the nut being threadedly connected to the support rod and being located above the inner bottom of the frame;

[0027] Wherein, the support plate is used to support the container.

[0028] The beneficial effects of the present invention are as follows: the present invention provides a fixture for testing the pulling force of a metal wire, and by arranging an opening on the front side of the frame, an open space is provided inside the frame, so that a first limiting cylinder and a second limiting cylinder for limiting the drawing die can be provided, and at the same time, a container containing lubricating liquid can also be placed in the frame, so that the lubricating liquid in the container can completely immerse the liquid through hole and flow into the first limiting cylinder through the liquid through hole.

[0029] Since during the test, the lubricating liquid stored in the container can continuously flow into the interior of the first limiting cylinder from the first liquid hole, and the first limiting cylinder blocks the drawing die underneath it, when lubricating liquid remains in the interior of the first limiting cylinder, it can be ensured that there is always lubricating liquid at the outlet end of the drawing die, and the lubricating liquid at the outlet end of the drawing die is in the main phase and can be replaced with the lubricating liquid in the container in real time, thereby ensuring that the state of the drawing die immersed in the lubricating liquid during the test is closer to the state of the die and metal wire immersed in the lubricating liquid during the actual production drawing process, thereby accurately obtaining the drawing force test results and evaluating the performance of the lubricating liquid.

[0030] In addition, compared with the existing steel wire pulling force testing fixture, the pulling force testing fixture described in the present invention is used to test the pulling force of the metal wire. The metal wire does not need to be pulled downward, and the bottom of the second limiting cylinder and the drawing mold are both located in the container, so the lubricating liquid can be completely prevented from penetrating into the mechanical testing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of a fixture for testing the pull-out force of a metal wire provided by the present invention.

[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the fixture for testing the pull-out force of the metal wire when it is placed horizontally.

[0033] Figure 3 This is a schematic diagram of the structure of another type of metal wire pull-out force test fixture when placed horizontally.

[0034] Figure 4 for Figure 1 Schematic diagram of the use of the fixture for testing the pull-out force of the metal wire described in .

[0035] Figure 5 yes Figure 4 Enlarged view of part A.

[0036] Reference numerals:

[0037] 1-Metal wire;

[0038] 2-frame; 201-opening; 202-cabling hole;

[0039] 3-first limiting cylinder; 301-second liquid hole;

[0040] 4-second limiting cylinder; 401-first liquid hole;

[0041] 5-drawing die; 6-container; 7-support plate; 8-support rod; 9-nut; 10-clamping part. DETAILED DESCRIPTION

[0042] The present invention provides a fixture for testing the pullout force of a metal wire. To clarify the objectives, technical solutions, and effects of the present invention, the present invention is further described below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit the present invention.

[0043] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0044] See also Figure 1 、 Figure 2 、 Figure 4 as well as Figure 5 The present invention provides a metal wire pullout force testing fixture suitable for testing the pullout force of metal wires 1, such as copper wire, aluminum wire, copper cord, and stainless steel wire. Specifically, the metal wire pullout force testing fixture includes a frame 2, a clamping portion 10, a first limiting cylinder 3, and a second limiting cylinder 4.

[0045] The frame 2 is rectangular, and an opening 201 is provided on the front side of the frame 2 , and a wiring hole 202 is provided on the top of the frame 2 .

[0046] The clamping portion 10 may be a plate vertically arranged at the bottom of the frame 2, and the clamping portion 10 is used for being clamped by the lower chuck of the mechanical testing machine so that the pull-out force test fixture of the present invention is fixed on the mechanical testing machine during testing.

[0047] Among them, the first limiting cylinder 3 is vertically arranged in the frame 2 and connected to the inner top of the frame 2, and the axial direction of the first limiting cylinder 3 is on the same straight line as the axial direction of the wiring hole 202; and the second limiting cylinder 4 is coaxial (that is, coaxial with the first limiting cylinder 3) and is sleeved on the outside of the first limiting cylinder 3, and the second limiting cylinder 4 is provided with a first liquid hole 401 that is connected to the inside of the first limiting cylinder 3.

[0048] The inner diameter of the second limiting cylinder 4 is consistent with the outer diameter of the drawing die 5, and the interior of the second limiting cylinder 4 is used to accommodate the drawing die 5 blocked by the first limiting cylinder 3. A space for placing a container 6 is formed between the lower end of the second limiting cylinder 4 and the inner bottom of the frame 2. The container 6 stores the lubricating liquid that flows into the first liquid hole 401 during testing.

[0049] Before carrying out the test, the frame 2 is clamped on the chuck on the lower side of the mechanical testing machine through the clamping part 10, and the drawing die 5 is placed in the second limiting cylinder 4, and the outlet end of the drawing die 5 is facing upward. Then the metal wire 1 to be tested is passed upward into the drawing die 5, and the upper end of the metal coil is clamped on the upper chuck of the mechanical testing machine after passing through the wiring hole 202; then the container 6 is placed in the frame 2, so that the first limiting cylinder 3 and the second limiting cylinder 4 are located in the container 6, and the lubricating liquid in the container 6 can completely immerse the first liquid hole 401, and flow into the first limiting cylinder 3 from the first liquid hole 401.

[0050] During the test, the upper chuck of the mechanical testing machine pulls the metal wire 1 upward to perform a pulling force test; and during the test, a thicker metal wire 1 is always left in the pulling plate hole of the drawing die 5. Therefore, when the metal wire 1 is pulled upward, there will be friction between the metal wire 1 and the drawing hole, which will cause the drawing die 5 to tend to move upward, and the drawing die 5 will not fall downward from the second limiting cylinder 4.

[0051] The blocking effect of the first limiting cylinder 3 on the mold can ensure that the drawing mold 5 does not contact the frame 2 during the test, and the degree of damage to the structure of the frame 2 is small.

[0052] During the test, since the lubricating liquid stored in the container 6 can continuously flow into the interior of the first limiting cylinder 3 through the first liquid hole 401, and the first limiting cylinder 3 blocks the drawing die 5 below it, when lubricating liquid remains in the interior of the first limiting cylinder 3, it can ensure that there is always lubricating liquid at the outlet end of the drawing die 5, and the lubricating liquid at the outlet end of the drawing die 5 is in the main phase, which can be replaced with the lubricating liquid in the container 6 in real time (the lubricating liquid located above the drawing die 5 can also flow back into the container 6 through the gap between the side of the drawing die 5 and the inner wall of the second limiting cylinder 4), thereby ensuring that the state of the drawing die 5 immersed in the lubricating liquid during the test is closer to the immersion state of the die and the metal wire 1 in the lubricating liquid during the actual production drawing process, thereby accurately obtaining the drawing force test results and evaluating the performance of the lubricating liquid.

[0053] Compared with the existing steel wire pulling force testing fixture, the pulling force testing fixture described in the present invention is used to test the pulling force of the metal wire 1. The metal wire 1 does not need to be pulled downward, and the bottom of the second limiting cylinder 4 and the drawing die 5 are both located in the container 6, so the lubricating liquid can be completely prevented from penetrating into the mechanical testing machine.

[0054] In a preferred embodiment of the present invention, the frame 2, clamping portion 10, first limiting cylinder 3, and second limiting cylinder 4 are integrally formed. The materials used for the integral molding can be metals and alloys, or hard organic materials. The metals and alloys can be, but are not limited to, carbon steel, stainless steel, titanium alloys, and high-temperature alloys. The hard organic materials can be, for example, polycarbonate (PC), polyethylene terephthalate (PET), ABS plastic, and polymethyl methacrylate (PMMA).

[0055] The pull-out force test fixture formed from the above-mentioned metal and alloy materials or hard organic matter has high strength, hardness and deformation resistance. The fixture is not easily damaged during testing, and it can also reduce safety hazards during the testing process.

[0056] In a preferred embodiment provided by the present invention, the lateral depth Dp of the frame 2 is ≥50 mm, and the thickness S3 of each side of the frame 2 is ≥5 mm, thereby ensuring that the container 6 can be stably placed in the frame 2 and ensuring the structural strength of the frame 2 itself.

[0057] In a preferred embodiment of the present invention, the length L3 of the clamping end in the vertical direction is ≥50 mm, and the thickness S4 of the clamping end is ≥5 mm, thereby enabling the clamping end to be stably clamped on different mechanical testing machines.

[0058] In the present invention, the diameter of the wiring hole 202 is set based on the thickness of the metal wire 1 to be tested, but the diameter of the wiring hole 202 should not be too small to prevent the metal wire 1 from directly contacting the metal wire 1 during the drawing process, thereby affecting the accuracy of the test results. The diameter of the wiring hole 202 should not be too large, thereby avoiding a significant decrease in the structural strength of the frame 2.

[0059] like Figure 3 As shown, in a preferred embodiment of the present invention, the second limiting cylinder 4 is sleeved on the outer wall of the first limiting cylinder 3, and the first liquid hole 401 passes through the second limiting cylinder 4 and the first limiting cylinder 3 at the same time, so that after the lubricating liquid completely immerses the first liquid hole 401, the lubricating liquid flows into the first limiting cylinder 3, so that after the drawing die 5 is stuck in the second limiting cylinder 4, the first limiting cylinder 3 above the drawing die 5 is loaded with lubricating liquid, and the situation in which the drawing die 5 is immersed in the lubricating liquid can be closer to the immersion state of the die and the metal wire 1 in the lubricating liquid during the actual production drawing process.

[0060] Regarding the positional relationship between the second limiting cylinder 4 and the first limiting cylinder 3, as shown in FIG. Figure 1 and Figure 2 As shown, the present invention also provides another design method, which is as follows:

[0061] The inner diameter of the second limiting cylinder 4 is larger than the outer diameter of the first limiting cylinder 3, and the second limiting cylinder 4 is connected to the inner top of the frame 2, that is, the first limiting cylinder 3 is located inside the second limiting cylinder 4. The first limiting cylinder 3 is provided with a second liquid hole 301 corresponding to and connected to the first liquid hole 401. When the lubricating liquid in the container 6 is completely immersed in the first liquid hole 401, the lubricating liquid flows into the interlayer between the first limiting cylinder 3 and the second limiting cylinder 4, and can flow into the interior of the first limiting cylinder 3 through the second liquid hole 301.

[0062] Compared with only allowing the first limiting cylinder 3 above the drawing die 5 to carry lubricating liquid, when the interlayer between the first limiting cylinder 3 and the second limiting cylinder 4 is also filled with lubricating liquid, the amount of lubricating liquid on the upper part of the drawing die 5 is greater, and the immersion effect of the drawing die 5 is better, which helps to obtain more accurate test data.

[0063] In a preferred embodiment of the present invention, a plurality of the first liquid holes 401 are distributed on the second limiting cylinder 4 along the circumference of the second limiting cylinder 4 to ensure that enough lubricating fluid can flow into the first limiting cylinder 3, or when the inner diameter of the second limiting cylinder 4 is larger than the outer diameter of the first limiting cylinder 3, it can also flow into the interlayer between the first limiting cylinder 3 and the second limiting cylinder 4 at the same time.

[0064] It should be noted that when the second limiting cylinder 4 and the first limiting cylinder 3 are independent of each other, that is, the inner diameter of the second limiting cylinder 4 is larger than the outer diameter of the first limiting cylinder 3, the number of second liquid holes 301 arranged on the first limiting cylinder 3 is consistent with the number of first liquid holes 401, and the first liquid holes 401 and the second liquid holes 301 should be connected.

[0065] In a preferred embodiment of the present invention, the thickness S1 of the first limiting cylinder 3 is ≥8 mm, and the thickness S2 of the second limiting cylinder 4 is ≥8 mm. In the present invention, the first limiting cylinder 3 can limit the upward movement of the drawing die 5, and the second limiting cylinder 4 can limit the lateral movement of the drawing die 5. Therefore, the first limiting cylinder 3 and the second limiting cylinder 4 must have sufficient strength to withstand the impact caused by the movement of the drawing die 5. When the thickness S1 of the first limiting cylinder 3 and the thickness S2 of the second limiting cylinder 4 both meet the above-mentioned requirements, it can ensure that the structural strength of the first limiting cylinder 3 and the second limiting cylinder 4 is maintained at a high level.

[0066] In a preferred embodiment of the present invention, the length L1 of the first limiting cylinder 3 is ≥20 mm, thereby ensuring that there is sufficient space above the drawing die 5 to carry the lubricating liquid, and the amount of lubricating liquid is sufficient. Accordingly, the drawing die 5 can be immersed in the lubricating liquid, and the physical and chemical properties of the metal wire 1 will not change too quickly during the test, which is conducive to accurately obtaining the drawing force test results and evaluating the performance of the lubricating liquid.

[0067] In a preferred embodiment of the present invention, the difference △L between the length L2 of the second limiting cylinder 4 and the length L1 of the first limiting cylinder 3 is ≥10mm. In this way, whether the second limiting cylinder 4 is directly sleeved on the first limiting cylinder 3, or the inner diameter of the second limiting cylinder 4 is larger than the outer diameter of the first limiting cylinder 3, so that the first limiting cylinder 3 is completely inside the second limiting cylinder 4, there is enough space inside the second limiting cylinder 4 to accommodate the drawing die 5, and the drawing die 5 can be limited by the first limiting cylinder 3.

[0068] After completing the drawing force test of the metal wire 1, the frame 2 needs to be placed horizontally to remove the drawing die 5 from the second limiting cylinder 4. When the frame 2 is placed horizontally, the drawing die 5 will exert downward pressure on the second limiting cylinder 4. Moreover, the heavy weight of the drawing die 5 will easily cause the second limiting cylinder 4 to deform. Therefore, in a preferred embodiment of the present invention, the length L2 of the second limiting cylinder 4 is less than or equal to twice the inner diameter of the second limiting cylinder 4. This ensures that the second limiting cylinder 4 has a strong load-bearing capacity and can resist deformation caused by the downward pressure of the drawing die 5.

[0069] In a preferred embodiment of the present invention, when the second limiting cylinder 4 is sleeved on the first limiting cylinder 3 (eg Figure 3 As shown in FIG5 ), the diameter D1 of the first liquid hole 401 is less than or equal to 50% of the length L1 of the first limiting cylinder 3.

[0070] When the inner diameter of the second limiting cylinder 4 is larger than the outer diameter of the first limiting cylinder 3, and the upper parts of the second limiting cylinder 4 and the first limiting cylinder 3 are simultaneously connected to the inner top of the frame 2 (such as Figure 2 As shown in FIG, the diameter D2 of the second liquid hole 301 is less than or equal to 50% of the length L1 of the first limiting cylinder 3, and the diameter D2 of the second liquid hole 301 is equal to the diameter D1 of the first liquid hole 401.

[0071] During the test, the first limiting cylinder 3 will be squeezed by the frame 2 and the drawing die 5 in the vertical direction at the same time, and the liquid hole on the first limiting cylinder 3 (this liquid hole can be either the first liquid hole 401 or the second liquid hole 301, depending on the positional relationship between the first limiting cylinder 3 and the second limiting cylinder 4) will cause stress concentration due to the destruction of the continuity of the limiting cylinder material. If the aperture of the liquid hole is too large, the degree of destruction of the material continuity is higher, and the stress concentration at the liquid hole is more intense, which will make the structure of the first limiting cylinder 3, especially the first limiting cylinder 3 area on the upper and lower sides of the liquid hole, easily damaged. Based on this, in order to ensure the structural strength of the two limiting cylinders, especially the first limiting cylinder 3, the present invention sets the diameter of the liquid hole. At the same time, research has found that when the diameter of the liquid hole (this liquid hole can be either the first liquid hole 401 or the second liquid hole 301, depending on the positional relationship between the first limiting cylinder 3 and the second limiting cylinder 4) is less than or equal to 50% of the length L1 of the first limiting cylinder 3, the stress at the liquid hole will not be too concentrated, and the deformation and fracture of the materials of the two limiting cylinders can be significantly improved.

[0072] Of course, in order to ensure that the lubricating liquid can continuously flow into or out of the first liquid hole 401 and the second liquid hole 301, the diameter D1 of the first liquid hole 401 and the diameter D2 of the second liquid hole 301 should both be at least 1 mm, thereby ensuring that the lubricating liquid at the outlet end of the drawing die 5 is in the main phase and can be replaced with the lubricating liquid in the container 6 in real time.

[0073] like Figure 4 As shown, in a preferred embodiment of the present invention, the fixture for testing the pull-out force of the metal wire further includes a support plate 7 and a support rod 8.

[0074] The support plate 7 is movably mounted above the inner bottom of the frame 2 to support the container 6, thereby meeting the need to place containers 6 of different heights. At least two support rods 8 are provided, and the support rods 8 are mounted at the bottom of the support plate 7 and movably connected to the bottom of the frame 2, thereby enabling the height of the support plate 7 to be adjusted.

[0075] In order to fix the support plate 7 at a specific height, the support rod 8 is also threadedly connected to a nut 9 located above the bottom of the frame 2. The support plate 7 can be fixed in height by supporting the nut 9 at the bottom of the frame 2.

[0076] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A fixture for testing the pull-out force of a metal wire, characterized in that: include: The frame has an opening on the front side and a wiring hole on the top of the frame. A clamping portion, wherein the clamping portion is arranged at the bottom of the frame, A first limiting cylinder is vertically arranged in the frame and connected to the inner top of the frame, and the axial direction of the first limiting cylinder is in the same straight line as the axial direction of the wiring hole. A second limiting cylinder, wherein the second limiting cylinder is coaxially sleeved on the outside of the first limiting cylinder, and the second limiting cylinder is provided with a first liquid hole communicating with the inside of the first limiting cylinder; The clamping part is used for clamping by the lower chuck of the mechanical testing machine; the interior of the second limiting cylinder is used to accommodate the drawing die blocked by the first limiting cylinder, and a space for placing a container is formed between the lower end of the second limiting cylinder and the inner bottom of the frame; the wiring hole is used to allow the metal wire passing through the drawing die to pass upward out of the frame, and the container stores the lubricating liquid that flows into the interior of the first limiting cylinder through the first liquid hole during testing; The inner diameter of the second limiting tube is larger than the outer diameter of the first limiting tube, and the second limiting tube is connected to the inner top of the frame; the first limiting tube is provided with a second liquid through hole corresponding to the first liquid through hole and connected to the first liquid through hole.

2. The metal wire pull-out force test fixture according to claim 1, characterized in that: The second limiting cylinder is sleeved on the outer wall of the first limiting cylinder, and the first liquid-passing hole penetrates both the second limiting cylinder and the first limiting cylinder.

3. The metal wire pull-out force test fixture according to claim 1, characterized in that: The plurality of first liquid-passing holes are distributed on the second limiting cylinder along the circumferential direction of the second limiting cylinder.

4. The metal wire pull-out force test fixture according to claim 3, characterized in that: The thickness S1 of the first limiting tube is ≥8 mm, and the thickness S2 of the second limiting tube is ≥8 mm.

5. The metal wire pull-out force test fixture according to claim 3, characterized in that: The length L1 of the first limiting tube is ≥20 mm.

6. The metal wire pull-out force test fixture according to claim 5, characterized in that: The difference △L between the length L2 of the second limiting tube and the length L1 of the first limiting tube is ≥10 mm, and the length L2 of the second limiting tube is less than or equal to twice the inner diameter of the second limiting tube.

7. The metal wire pull-out force test fixture according to claim 3, characterized in that: The diameter D1 of the first liquid-passing hole is less than or equal to 50% of the length L1 of the first limiting cylinder.

8. The metal wire pull-out force test fixture according to claim 3, characterized in that: The diameter D2 of the second liquid through hole is less than or equal to 50% of the length L1 of the first limiting cylinder, and the diameter D2 of the second liquid through hole is equal to the diameter D1 of the first liquid through hole.

9. The metal wire pull-out force test fixture according to claim 1, characterized in that: Also includes: A support plate, the support plate is movably arranged above the inner bottom of the frame, At least two support rods, at least two of which are arranged at the bottom of the support plate, and the support rods are movably connected to the bottom of the frame, A nut, the nut being threadedly connected to the support rod and the nut being located above the inner bottom of the frame; Wherein, the support plate is used to support the container.

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