A test mould for testing the shear strength of a PCD-cemented carbide brazed joint

Abstract

The utility model provides a kind of be suitable for PCD-hard alloy brazing joint shearing strength test mould, it is related to welding shearing strength test field.The utility model adopts three-part split design, including base, pressure rod and sliding block, its structure is simple, can realize quick clamping.The utility model passes through being set first hole and second hole in the front and upper surface of base, so that the sliding block of being equipped with the welding piece of being tested is inserted into the inside of base by the sliding slot in first hole sliding, simultaneously, pressure rod can be pressed into from the second hole of the upper surface of base, and the pressure of outside is transferred to the welding piece of being tested in the inside of base.The utility model tests the shearing strength of welding joint by the combination of three parts.

Description

Technical Field

[0001] This utility model relates to the field of welding shear strength testing, specifically a mold for testing the shear strength of polycrystalline diamond (PCD) cemented carbide brazed joints. Background Technology

[0002] Polycrystalline diamond (PCD) tools, due to their extremely high hardness and wear resistance, are widely used for the finishing of metallic surfaces and the precision machining of non-metallic ceramic materials. PCD tool manufacturing is relatively complex; they are typically difficult to directly form complex shapes. They are usually cut into PCD sheets or cylindrical PCD tips, which are then brazed to a carbide or steel tool body before use. PCD and carbide or steel substrates represent typical heterogeneous welding; therefore, the shear strength of the weld joint is crucial. According to the current national standard for weld joint testing (GB T 11363-2008 Standard for Test Method of Brazed Joint Strength), the shear strength of the weld joint is the highest priority test indicator, preceding the tensile strength test.

[0003] When machining high-hardness ceramics such as SiC ceramic matrix composites, PCD superhard tools are preferred. The tool as a whole needs to have high rigidity, so cemented carbide is usually selected as the tool body material and the two are welded together by brazing. After welding, the shear strength of the weld joint needs to be tested. In order to ensure that the test piece does not shift during the test, a specific mold is usually required for fixation.

[0004] The prior art disclosed in CN222704419U is a welding strength and shear strength tester. It uses a rotating shaft and multiple mounting seats to allow a base to move fixtures fixed to several mounting seats on the top of the base sequentially under the pusher blade, thus allowing the pusher blade to shear the components sequentially. Simultaneously, a clamping plate holds the test component within the fixed fixture. During testing, the base first rotates the tested component out from under the measuring module, then the test component, along with the fixed fixture, is removed from the mounting seats. The fixing screws on both sides of the mounting seats are then loosened, and the test instrument is removed. Its structure is complex, and the clamping operation is cumbersome, consuming significant manpower and time costs during the installation and removal of the test piece. Utility Model Content

[0005] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a mold suitable for testing the shear strength of PCD-hard alloy brazed joints. It has a simple structure, is easy to clamp, and has good overall stability after clamping.

[0006] The embodiments of this utility model are implemented as follows: This application provides a mold suitable for testing the shear strength of PCD-hard alloy brazed joints, which includes a base, a pressure bar, and a slider.

[0007] Furthermore, the base is a flat cuboid with a first hole and a second hole on its front and top surfaces, respectively, and the two holes are connected inside the base. The first hole on the front surface slides into the slider via a groove, ensuring that the slider can be inserted into the base. The size of the second hole on the top surface matches the cross-sectional size of the pressure rod, ensuring that the pressure rod can be pressed into the base.

[0008] Furthermore, the bottom of the pressure bar is provided with an arc-shaped groove, and the height of the pressure bar is longer than the depth of the second hole on the upper surface.

[0009] Furthermore, the top of the pressure bar is connected to a universal testing machine with a downward lever arm, so that the pressure applied by the pressure bar is transmitted to the welded part under test inside the base.

[0010] Furthermore, the slider has a through cylindrical opening, and the size of the slider opening is adapted to the welded part being tested, so that the part being tested can be embedded into the slider through the opening.

[0011] Furthermore, when the slider is inserted into the base through the first hole on the front of the base via the groove, the welded part under test embedded in the slider is coaxial with the arc-shaped groove at the bottom of the pressure rod in the vertical direction, thus achieving complete fit between the arc-shaped groove and the welded part under test.

[0012] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects:

[0013] 1. The mold adopts a three-part split design, including a base, a pressure rod, and a slider. The structure is simple and can be quickly clamped.

[0014] 2. By utilizing the allowance reserved between the length of the hole on the front of the base and the length of the test piece, and between the opening of the slider and the diameter of the test piece, it is convenient to load and can achieve self-locking during the test, with good overall stability and no displacement during the test. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall shear strength testing mold according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the base according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the compression bar in an embodiment of this application;

[0019] Figure 4 This is a schematic diagram of the slider in an embodiment of this application;

[0020] Figure 5 This is a schematic diagram of the welded component being tested in an embodiment of this application;

[0021] Figure 6 This is a schematic diagram of a slider equipped with a weldment under test according to an embodiment of this application;

[0022] Figure captions: 1-base; 2-pressure rod; 3-slider; 4-tested welded part; 5-second hole; 6-first hole; 7-arc groove; 8-cylindrical opening; 9-carbide cutter body; 10-PCD cutter head; 11-weld; 12-slide groove. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Therefore, the following detailed description of the embodiments of this utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but merely to illustrate selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Example

[0027] The following is a detailed description of a mold for testing the shear strength of PCD-hard alloy brazed joints, based on an embodiment of this utility model:

[0028] This application provides a mold suitable for testing the shear strength of PCD-carbide brazed joints. Please refer to... Figure 1 , Figure 1 The diagram shown is an overall schematic of the shear strength test mold according to an embodiment of this application, which includes a base 1, a pressure rod 2, a slider 3, a first hole 6, and a second hole 5.

[0029] Furthermore, the base 1 is a flat cuboid, optionally made of a transparent material for easy observation of the interior. Its front and top surfaces are respectively provided with a first hole 6 and a second hole 5, and the two holes are connected within the base. The first hole 6 on the front surface has a groove 12 to limit the sliding of the slider 3 within the hole, ensuring that the slider 3 is installed in the correct position within the base 1. The size of the second hole 5 on the top surface matches the cross-sectional size of the pressure rod 2, ensuring that the pressure rod 2 can be pressed into the base 1.

[0030] For further details, please refer to Figure 3 The bottom of the pressure rod 2 is provided with an arc-shaped groove 7, the arc-shaped dimensions of which are adapted to the welded part 4 being tested. At the same time, the height of the pressure rod 2 is greater than the depth of the second hole 5 on the upper surface, so that the pressure rod 2 can be pulled out from the first hole 6 on the base 1.

[0031] Furthermore, when the pressure rod 2 is pressed into the base 1, the welded part 4 to be tested embedded in the slider 3 is coaxial with the arc-shaped groove 7 at the bottom of the pressure rod 2 in the vertical direction, thus achieving complete fit between the arc-shaped groove 7 and the welded part 4 to be tested.

[0032] For further details, please refer to Figure 4 The slider 3 is provided with a through cylindrical opening 8, and the size of the opening is large enough to accommodate the welded part 4 to be tested, so that the part to be tested can be inserted into the slider 3 through the cylindrical opening 8.

[0033] For further details, please refer to Figure 5 , Figure 5 The diagram shows a welding test piece. The left side is the carbide cutter body 9, the right side is the PCD cutter head 10, and the junction is the weld seam 11.

[0034] For further details, please refer to Figure 6 The carbide cutter body 9 of the cylindrical welding head is inserted into the cylindrical opening 8 of the slider 3. Since the width of the slider 3 is the same as the length of the carbide cutter body 4, after the carbide cutter body 4 is inserted, the exposed position is the PCD cutter body 10 and the weld 11. At the same time, a 0.1mm margin is left in the cylindrical opening 8 of the carbide cutter body 4 to facilitate the installation and removal of the tested welded part 4 in the slider 3.

[0035] The working principle of this utility model is as follows: When the slider 3 of the test welded part 4 is slidably inserted into the base 1 through the slide groove 12, the top of the pressure rod 2 is connected to the downward force arm of the universal testing machine. The parameters are adjusted so that the downward force arm of the universal testing machine generates a pressure that increases continuously and uniformly, with an increase of 1N. This pressure is applied vertically to the PCD cutter body 10 of the test welded part 4. By observing the bending and fracture of the weld 11, the maximum pressure value that the weld joint of the test welded part 4 can withstand is determined, and the shear strength test of the weld joint is completed.

[0036] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mold suitable for testing the shear strength of PCD-hard alloy brazed joints, characterized in that, It includes a base (1), a pressure rod (2) and a slider (3); the base (1) is a cuboid, with a first hole (6) and a second hole (5) on its front and upper surfaces respectively, and the two holes are connected in the base (1). At the same time, the first hole (6) is slidably engaged with the slider (3), and the size of the second hole (5) is adapted to the cross-sectional size of the pressure rod (2).

2. The mold for testing the shear strength of PCD-hard alloy brazed joints according to claim 1, characterized in that, The bottom of the pressure rod (2) is provided with an arc-shaped groove (7), and the height of the pressure rod (2) is greater than the depth of the second hole (5).

3. A mold for testing the shear strength of PCD-hard alloy brazed joints according to claim 2, characterized in that, The dimensions of the arc-shaped groove (7) are adapted to the weldment (4) being tested.

4. A mold for testing the shear strength of PCD-hard alloy brazed joints according to claim 3, characterized in that, The slider (3) is provided with a through cylindrical opening (8).

5. A mold for testing the shear strength of PCD-hard alloy brazed joints according to claim 4, characterized in that, The dimensions of the cylindrical opening (8) are adapted to the weldment (4) being tested.

6. A mold for testing the shear strength of PCD-hard alloy brazed joints according to claim 5, characterized in that, The welded part (4) being tested is embedded in the slider (3) through the cylindrical opening (8).

7. A mold for testing the shear strength of PCD-hard alloy brazed joints according to claim 6, characterized in that, When the slider (3) slides to the inside of the first hole (6), the welded part (4) to be tested embedded in the slider (3) is adapted to the arc-shaped groove (7).

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