A T-type specimen hardness test fixture

Abstract

The utility model discloses a T type sample hardness test anchor clamps, including base and reverse thread adjusting shaft. The inside of base is equipped with recess, and the left and right sides of recess are mesa, reverse thread adjusting shaft passes through recess from front and back direction, and has threaded section respectively in front and back, one section is positive thread section, and the other section is reverse thread section, be equipped with first clamping sliding block on positive thread section, and first clamping sliding block is equipped with first mounting hole, and first mounting hole has the internal thread cooperation with positive thread section, be equipped with second clamping sliding block on reverse thread section, and second clamping sliding block is equipped with second mounting hole, and second mounting hole has the internal thread cooperation with reverse thread section, and the front and back two ends of reverse thread adjusting shaft are rotatablely connected with the front and back two ends of base, still include sample support block, provide enough rigid support when T type hardness sample carries out hardness test, guarantee T type hardness sample indentation form neat and the accuracy of hardness test result, especially suitable for small specification T type sample hardness test.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a T-shaped specimen hardness testing fixture. Background Technology

[0002] T-welding, as a highly efficient joining technology, works by using the heat of an electric arc to melt the tip of the weld stud and the surface of the base metal together, forming a metallurgical bond upon cooling. Performance testing methods for T-welding can be divided into destructive and non-destructive categories. The Vickers hardness test is a commonly used destructive testing method, frequently applied to the inspection of weld cross-sections. This test is primarily used to detect the hardness distribution of the weld and the heat-affected zone, evaluate the presence of localized hardening, assess the microstructure of the heat-affected zone and its susceptibility to cold cracking, and ultimately evaluate the welding process quality and the potential performance of the joint.

[0003] However, due to the unique shape of T-welded specimens and the frequent use of small-diameter bar-shaped steel, such as weld studs, in practical engineering, the hardness test specimens prepared by grinding the weld stud side are typically very thin, only about 2-3 mm thick. When performing Vickers hardness tests on these thin-walled, small specimens, conventional fixing methods cannot provide sufficient rigid support. During the application of the test force, the weld stud side is prone to bending deformation or local collapse. This deformation disrupts the regularity of the indentation, leading to increased measurement errors in the indentation diagonal, ultimately distorting the measured hardness value and affecting the accuracy and reliability of the test results. Summary of the Invention

[0004] The purpose of this invention is to provide a T-shaped specimen hardness test fixture that can provide sufficient rigid support for Vickers hardness testing of T-shaped welded specimens, especially small specimens, so that the test can be carried out smoothly.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This application provides a T-type specimen hardness test fixture, including a base and a reverse thread adjustment shaft. The base has a groove inside, and the left and right sides of the groove are platforms. The reverse thread adjustment shaft passes through the groove from front to back and has threaded sections at the front and back respectively: one is a forward threaded section and the other is a reverse threaded section.

[0007] The forward threaded section is provided with a first clamping slider, the first clamping slider is provided with a first mounting hole, the first mounting hole has an internal thread that mates with the forward threaded section; the reverse threaded section is provided with a second clamping slider, the second clamping slider is provided with a second mounting hole, the second mounting hole has an internal thread that mates with the reverse threaded section.

[0008] The front and rear ends of the reverse threaded adjustment shaft are rotatably connected to the front and rear ends of the base, respectively; it also includes a sample support block, the left and right sides of which are respectively placed on the left and right side platforms of the base.

[0009] To optimize the above technical solution, the specific measures also include:

[0010] The forward thread segment and the reverse thread segment are symmetrical front to back, and the first clamping slider and the second clamping slider are symmetrical front to back.

[0011] The base has through holes at both the front and rear ends, and the reverse threaded adjusting shaft passes through the front and rear through holes.

[0012] Furthermore, at the front and rear ends of the reverse threaded adjusting shaft, one end is a convex shank and the other end is a convex block, and the diameters of both the convex shank and the convex block are larger than the diameter of the through hole.

[0013] A left-protruding movable track is provided between the groove of the base and the left side of the platform, and a right-protruding movable track is provided between the groove of the base and the right side of the platform.

[0014] Preferably, the bottom of the left and right ends of the first and second clamping sliders are slidably engaged with the left and right protruding movable tracks, respectively.

[0015] The platform is provided with fixing holes for mounting a hardness testing machine.

[0016] Furthermore, the top surface of the middle part of the sample support block is a concave arc surface, which is used to support the welding studs of the T-shaped sample.

[0017] The sample support block has threaded holes on its left and right sides, with bolts inside each hole. The bolts pass through the threaded holes and are supported on the base platform at the bottom.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention provides a special fixture for Vickers hardness testing of T-type welded joint sections. The fixture mainly consists of a clamping block and a sample support block. It is used to securely clamp the thin-walled section sample to be tested. The sample is fixed by the clamping block, and the height of the sample support block is adjusted so that its top surface accurately abuts against and supports the lower surface of the weld stud side or other thin-walled areas of the sample. This provides sufficient rigid support when performing Vickers hardness testing in these areas. This support can effectively prevent bending or collapse deformation of the thin-walled part of the sample under test force, ensuring regular indentation shape and accuracy of hardness test results. In addition, the fixture has a simple structure, is easy to operate, and has low manufacturing cost. Attached Figure Description

[0020] Figure 1: A schematic diagram of the structure of the T-shaped specimen hardness test fixture of this utility model.

[0021] Figure 2 : Exploded view of the structure of the T-type specimen hardness test fixture of this utility model.

[0022] Figure 3 : Schematic diagram of the T-type hardness test specimen structure of this utility model.

[0023] In the figure: 1-base, 2-first clamping slider, 3-second clamping slider, 4-sample support block, 5-protruding shank, 6-reverse thread adjustment shaft, 7-reverse thread section, 8-forward thread section, 9-first bolt, 10-second bolt, 11-first internal thread hole, 12-second internal thread hole, 13-left protruding movable track, 14-right protruding movable track, 15-fixed hole, 16-protrusion. Detailed Implementation

[0024] The present invention will be further described in detail below through specific embodiments. However, it should not be construed as the scope of the present invention being limited to the following embodiments. All technologies implemented based on the present invention fall within the scope of the present invention.

[0025] In the description of this utility model, it should also be noted that:

[0026] The orientations or positional relationships described herein are based on the relationships shown in the accompanying drawings and are only for the purpose of facilitating the description of this utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In this embodiment, for the sake of description, the orientation to the right in the figure is taken as the foreground.

[0027] The technical solution of this utility model will be further described in detail below with reference to specific embodiments:

[0028] This utility model provides a T-type specimen hardness testing fixture, such as... Figure 1 As shown, it includes a base 1, a first clamping slider 2, a second clamping slider 3, and a sample support block 4.

[0029] like Figure 2As shown, the base 1 has a groove inside, and the left and right sides of the groove are platforms. The reverse threaded adjustment shaft 6 passes through the groove from front to back, and has threaded sections at the front and back respectively: one is a forward threaded section 8, and the other is a reverse threaded section 7. The forward threaded section 8 is provided with a first clamping slider 2, which has a first mounting hole with an internal thread that mates with the forward threaded section 8. The reverse threaded section 7 is provided with a second clamping slider 3, which has a second mounting hole with an internal thread that mates with the reverse threaded section 7. The first clamping slider 2 and the second clamping slider 3 are controlled to move closer or separate by rotating the reverse threaded adjustment shaft 6 clockwise or counterclockwise.

[0030] Preferably, it also includes a sample support block 4, with the left and right sides of the sample support block 4 respectively resting on the left and right side platforms of the base, and the front of the sample support block 4 and the sample support block 4 facing outwards. Figure 3 The T-shaped hardness test specimen shown is in close contact with the weld stud side and is fixed in the center of the base 1 under the clamping action of the first clamping slider 2 and the second clamping slider 3.

[0031] Preferably, the forward thread section 8 and the reverse thread section 7 are symmetrical, and the first clamping slider 2 and the second clamping slider 3 are symmetrical, ensuring the synchronicity of the movement of the first clamping slider 2 and the second clamping slider 3.

[0032] In some embodiments, the front and rear ends of the reverse threaded adjusting shaft 6 are rotatably connected to the front and rear ends of the base 1, respectively.

[0033] Preferably, the base 1 has through holes at both the front and rear ends, and the reverse threaded adjusting shaft 6 passes through the front and rear through holes.

[0034] Preferably, at the front and rear ends of the reverse threaded adjusting shaft 6, one end is a shank 5 and the other end is a protrusion 16. The diameters of the shank 5 and the protrusion 16 are both larger than the diameter of the through hole, forming an axial stop structure to ensure that the reverse threaded adjusting shaft 6 will not have axial displacement.

[0035] In some embodiments, a left protruding movable track 13 is provided between the groove of the base 1 and the left side of the platform; a right protruding movable track 14 is provided between the groove of the base 1 and the right side of the platform.

[0036] Preferably, the bottom of the left and right ends of the first clamping slider 2 and the second clamping slider 3 are slidably engaged with the left protruding movable track 13 and the right protruding movable track 14, respectively, so that the first clamping slider 2 and the second clamping slider 3 maintain parallel movement and avoid path deviation caused by thread clearance.

[0037] In some embodiments, the top surface of the middle part of the sample support block 4 is a concave arc surface, which is in stable contact with the surface of the weld stud of the T-type hardness sample, to prevent the weld stud side from bending or collapsing during the application of test force, thus affecting the test results.

[0038] In some embodiments, the left and right sides of the sample support block 4 are respectively provided with a first threaded hole 11 and a second threaded hole 12 that pass through vertically. The first bolt 9 and the second bolt 10 are respectively provided inside the sample support block 4. The first bolt 9 and the second bolt 10 pass through the first threaded hole 11 and the second threaded hole 12 and are supported on the base platform. The vertical support height of the sample support block 4 is controlled by the first bolt 9 and the second bolt 10 to adapt to T-shaped samples of different heights.

[0039] In some embodiments, the platform is also provided with fixing holes 15 for precise positioning and rigid installation of the hardness testing machine.

[0040] The method of using this utility model clamp is as follows:

[0041] Place the T-type hardness test specimen and the specimen support block 4 between the first clamping slider 2 and the second clamping slider 3. The specimen support block 4 is located on the weld stud side. Screw the first bolt 9 and the second bolt 10 into the first threaded hole 11 and the second threaded hole 12 on both sides of the specimen support block 4. Adjust the height of the specimen support block 4 so that the hardness test surface is horizontal. Rotate the reverse threaded adjustment shaft 6 by turning the cam 5 to control the first clamping slider 2 and the second clamping slider 3 to move towards each other and gradually clamp the T-type hardness test specimen and the specimen support block 4. Then place or fix the T-type specimen hardness test fixture on the stage of the hardness tester for testing.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the present utility model's technical solution and based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A T-shaped specimen hardness testing fixture, characterized in that: Includes a base (1) and a reverse threaded adjustment shaft (6). The base (1) has a groove inside, and the left and right sides of the groove are platforms. The reverse threaded adjustment shaft (6) passes through the groove from front to back and has threaded sections at the front and back respectively: one is a forward threaded section (8) and the other is a reverse threaded section (7). The forward threaded section (8) is provided with a first clamping slider (2), the first clamping slider (2) is provided with a first mounting hole, the first mounting hole has an internal thread that mates with the forward threaded section (8); the reverse threaded section (7) is provided with a second clamping slider (3), the second clamping slider (3) is provided with a second mounting hole, the second mounting hole has an internal thread that mates with the reverse threaded section (7); The front and rear ends of the reverse threaded adjusting shaft (6) are rotatably connected to the front and rear ends of the base (1), respectively. It also includes a sample support block (4), which is placed on the left and right sides of the base (1) respectively.

2. The T-type specimen hardness testing fixture according to claim 1, characterized in that: The base (1) has through holes at both the front and rear ends, and the reverse threaded adjusting shaft (6) passes through the front and rear through holes.

3. The T-type specimen hardness testing fixture according to claim 2, characterized in that: The front and rear ends of the reverse threaded adjusting shaft (6) are a shank (5) and a protrusion (16), respectively. The diameters of the shank (5) and the protrusion (16) are both larger than the diameter of the through hole.

4. The T-type specimen hardness testing fixture according to claim 1, characterized in that: A left protruding movable track (13) is provided between the groove of the base (1) and the left side table surface, and a right protruding movable track (14) is provided between the groove of the base (1) and the right side table surface.

5. The T-type specimen hardness testing fixture according to claim 4, characterized in that: The bottom of the left and right ends of the first clamping slider (2) and the second clamping slider (3) are slidably engaged with the left protruding movable track (13) and the right protruding movable track (14), respectively.

6. The T-type specimen hardness testing fixture according to claim 1, characterized in that: The platform is provided with fixing holes (15) for mounting a hardness testing machine.

7. The T-type specimen hardness testing fixture according to claim 1, characterized in that: The top surface of the middle part of the sample support block (4) is a concave arc surface, which is used to support the welding studs of the T-shaped sample.

8. The T-type specimen hardness testing fixture according to claim 1, characterized in that: The sample support block (4) has a first threaded hole (11) and a second threaded hole (12) that are connected vertically on the left and right sides respectively. A first bolt (9) and a second bolt (10) are respectively provided inside the support block. The first bolt (9) and the second bolt (10) pass through the bottom of the threaded hole and are supported on the table surface of the base (1).

9. The T-type specimen hardness testing fixture according to claim 1, characterized in that: The forward thread segment (8) and the reverse thread segment (7) are symmetrical front and back, and the first clamping slider (2) and the second clamping slider (3) are symmetrical front and back.

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