A dynamic impact test fixture for polycrystalline diamond compacts

Abstract

The utility model discloses a kind of polycrystalline diamond compact dynamic impact test fixture, belong to superhard composite material performance test technical field.The fixture includes mounting seat, replaceable positioning block, gasket group and locking assembly.15°-30° inclined groove is equipped in mounting seat bottom for adapting modular positioning block, and different models of compact are matched by positioning groove;Gasket group is symmetrically laid out, and is locked by radial compression bolt, to avoid welding thermal damage;Positioning block uses buffer material to absorb impact energy.The utility model is strong in universality, adapts φ10-φ30mm compact, and change time is less than or equal to 2 minutes;Maintenance cost is low, and positioning block can be replaced individually;Test precision is high, there is no thermal assembly clamp, and symmetric compression design ensures data reliability, and it is applicable to the dynamic impact performance test of polycrystalline diamond compact.

Description

Technical Field

[0001] This utility model relates to the field of superhard material testing technology, and in particular to a dynamic impact testing fixture for polycrystalline diamond composite sheets. Background Technology

[0002] Polycrystalline diamond composite (PDC), as an ultra-hard composite material, is made by sintering diamond micro powder and cemented carbide substrate under ultra-high pressure and high temperature conditions. It combines the ultra-high hardness and wear resistance of diamond with the impact toughness of cemented carbide and is widely used in high-end equipment fields such as oil drill bits, geological drilling tools, and cutting tools.

[0003] In real-world applications, polycrystalline diamond composite (PDC) sheets are frequently subjected to dynamic impact loads, and their resistance to dynamic impact directly affects tool life and operational efficiency. Therefore, accurately testing the dynamic impact performance of PDC is crucial for optimizing product design and improving quality.

[0004] Currently, dynamic impact testing of polycrystalline diamond composite sheets typically employs the drop hammer impact method, and the choice of fixture directly affects the accuracy of the test results. Chinese patent application CN201920699137.9 discloses a fixture for impact testing of diamond composite sheets, which uses welding to fix the PDC (polycrystalline diamond substrate) to the fixture. This method suffers from welding thermal stress, making it difficult to ensure uniform pressure during the impact process. Furthermore, welding the PDC to the fixture makes the fixture difficult to reuse, increasing testing costs.

[0005] Existing technologies for dynamic impact testing fixtures for polycrystalline diamond composite sheets have the following drawbacks: First, they have poor clamping stability, as the diamond composite sheet is prone to slight displacement or deflection during impact, resulting in large dispersion of test data and failing to accurately reflect its true impact resistance performance. Second, they lack versatility, making it difficult to adapt to testing diamond composite sheets of different sizes and shapes, requiring frequent fixture changes for different specifications, increasing testing costs and time. Third, they lack effective protection and buffering designs, easily damaging the sample surface during clamping, and the uneven transfer of impact energy affects the reliability of test results. Utility Model Content

[0006] The purpose of this invention is to overcome the problems of poor versatility, low clamping efficiency, and high testing cost of existing fixtures. It provides a modularly designed dynamic impact test fixture for polycrystalline diamond composite sheets, which can be adapted to various polycrystalline diamond composite sheet models by changing the positioning blocks, thereby achieving precise clamping and improving testing efficiency and data reliability.

[0007] The purpose of this utility model is achieved through the following technical solution: a dynamic impact test fixture for polycrystalline diamond composite sheets, including a mounting base for mounting on a test device, wherein an inclined groove is provided at the bottom; A positioning block, adapted and installed in the inclined groove, has a positioning groove on its top for positioning polycrystalline diamond composite sheets; Gaskets are symmetrically arranged on both sides of the positioning groove and between the two walls of the inclined groove; The locking assembly includes screw holes on both sides of the inclined groove and a clamping bolt threaded into the screw holes.

[0008] Furthermore, the inclination angle of the groove is 15°-30°.

[0009] Furthermore, the locking assembly also includes a threaded connecting rod for securing the mounting base to the test equipment.

[0010] Furthermore, the gasket set consists of two gaskets.

[0011] Furthermore, the positioning block has a U-shaped structure.

[0012] This utility model has the following advantages: 1. Improved versatility: The distance can be adjusted by bolt compression to accommodate polycrystalline diamond composite sheets of different thicknesses, and the positioning block can be adapted to diamond composite sheets of different diameters within a certain size range, eliminating the need for frequent replacement of the fixture body and improving testing efficiency.

[0013] 2. Protection and buffering optimization: The positioning block and shim assembly can protect the surface of the polycrystalline diamond composite sheet from clamping damage and buffer energy during impact, so that the impact load is transmitted more evenly and the reliability of test results is improved.

[0014] 3. Improved testing accuracy: The mechanical locking design eliminates welding thermal stress and ensures uniform pressure. Together with positioning block 4, it enables multi-dimensional, adaptive, and stable clamping of polycrystalline diamond composite sheets, effectively avoiding sample displacement and deflection during impact testing and ensuring the accuracy of test data.

[0015] 4. Easy installation: The threaded connecting rod can be quickly installed into the test equipment, shortening the test preparation time.

[0016] 5. Low maintenance cost: As a consumable, the positioning block can absorb impact energy, reduce damage to the mounting base, extend the life of the mounting base, and reduce maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present invention; Figure 3 This is a schematic diagram of the mounting base structure in an embodiment of the present invention; Figure 4 This is a schematic diagram of the positioning block structure in an embodiment of the present invention.

[0018] In the diagram, 1 is the mounting base; 2 is the threaded connecting rod; 3 is the inclined groove; 4 is the positioning block; 5 is the positioning slot; 6 is the gasket set; 7 is the threaded hole; 8 is the clamping bolt; and 9 is the polycrystalline diamond composite sheet. Detailed Implementation

[0019] 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. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] Example like Figures 1 to 4As shown, a dynamic impact test fixture for polycrystalline diamond composite sheets includes a mounting base 1, positioning blocks 4, a gasket assembly 6, and a locking component. The mounting base 1 is used to fix the polycrystalline diamond composite sheet 9 to the test equipment. An inclined groove 3 with an inclination angle of 15°-30° is formed on its bottom to optimize the fixing stability of the polycrystalline diamond composite sheet 9. A positioning block 4, adapted to the inclined groove 3, is provided within the groove 3. A positioning groove 5 for positioning the polycrystalline diamond composite sheet 9 is provided on its top. The positioning block 4 has a U-shaped structure and is made of a buffer material to absorb impact energy and protect the mounting base 1. The gasket assembly 6 is symmetrical. The positioning block 4 is positioned between the two sides of the positioning groove 5 and the two walls of the inclined groove 3, and includes two gaskets. The distance can be adjusted by the bolts 8 to accommodate polycrystalline diamond composite sheets 9 of different thicknesses. The locking assembly includes screw holes 7 on both sides of the inclined groove and a clamping bolt 8 threadedly connected to the screw holes. The radial clamping and fixing of the polycrystalline diamond composite sheet 9 is achieved by abutting the gasket group 6. The positioning block 4 is a replaceable modular structure. By replacing the positioning block with different specifications, it can adapt to polycrystalline diamond composite sheets 9 in the range of φ10-φ30mm. The replacement time is ≤2 minutes, which significantly improves the testing efficiency.

[0023] 1. Fixture structure and installation The fixture includes a mounting base 1, replaceable positioning blocks 4, a gasket set 6, and a locking assembly. The mounting base 1 is fixed to the testing equipment via a threaded connecting rod 2. Its bottom has an inclined groove 3 with an inclination angle of 15°-30°. This inclined design optimizes the stability of the composite sheet and reduces the risk of displacement during impact. The positioning block 4 is made of cushioning material and has a positioning groove 5 on its top that matches the size of the composite sheet. It can accommodate polycrystalline diamond composite sheets 9 with a diameter of φ10-30mm. When replacing the positioning block, simply loosen the locking assembly, remove the old positioning block, and install the new one; the entire process takes no more than 2 minutes.

[0024] 2. Clamping and locking operation Before testing, the composite sheet 9 to be tested is placed in the positioning groove 5, ensuring that it is completely in contact with the bottom of the groove. Then, shim sets 6 are placed symmetrically on both sides of the positioning groove. The shim sets are made of metal or composite materials, and the thickness can be adjusted according to the size of the composite sheet. By rotating the clamping bolt 8, it is pressed against the shim sets, and a radial pressure of 10-20N is applied to the composite sheet. During the tightening process, the symmetrical distribution of the shim sets can avoid stress concentration on one side and ensure that the composite sheet is subjected to uniform force.

[0025] 3. Impact Testing and Performance Optimization After clamping, the fixture is installed on the drop hammer impact tester. The cushioning material of the positioning block 4 can absorb part of the impact energy, reducing the instantaneous load on the composite sheet, while protecting the mounting base 1 from damage. In high-energy impact tests such as 3000J, the gasket group 6 underwent slight deformation, while the positioning block and mounting base remained intact, requiring only the gaskets to be replaced for continued use.

[0026] Test Example 1: Standard PDC test This fixture is used to test a standard PDC with a diameter of 16mm.

[0027] Select the corresponding positioning block 4, whose positioning groove 5 has a size of 16mm.

[0028] Place the PDC in the positioning slot 5 and install the gasket group 6 symmetrically.

[0029] Tighten by clamping bolt 8 and apply radial pressure of 10N.

[0030] The test was conducted on a drop hammer impact device with a cumulative impact energy of 500J. Results: The fixture was stable and there was no deviation; the PDC was not damaged, and the test repeatability was good.

[0031] Test Example 2: Large PDC test It is compatible with large PDCs with a diameter of 20mm.

[0032] Replace positioning block 4 and adjust the size of positioning groove 5 to 20mm.

[0033] The installation process is the same as in Test Example 1. Results: High versatility, replacement time <1 minute; efficiency improved by 80% compared to traditional fixtures.

[0034] Test Example 3: High impact test The cumulative impact energy in the simulated high-impact environment downhole is 3000J.

[0035] Use cushioning material pad group 6 to absorb impact energy.

[0036] Post-test inspection: Gasket group 6 was slightly deformed and replaceable; locating block 4 showed no obvious deformation; mounting base 1 was intact. Result: Low maintenance cost, suitable for large-scale testing.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dynamic impact testing fixture for polycrystalline diamond composite sheets, characterized in that: Includes a mounting base (1) for mounting on a test device, the bottom of which has an inclined groove (3); The positioning block (4) is adapted and installed in the inclined groove (3), and its top is provided with a positioning groove (5) for positioning polycrystalline diamond composite sheet; Gasket group (6) is symmetrically arranged on both sides of the positioning groove (5) and between the two walls of the inclined groove (3); The locking assembly includes screw holes (7) on both sides of the inclined groove (3) and clamping bolts (8) threadedly connected to the screw holes (7).

2. The dynamic impact testing fixture for polycrystalline diamond composite sheets according to claim 1, characterized in that: The inclination angle of the groove (3) is 15°-30°.

3. The dynamic impact testing fixture for polycrystalline diamond composite sheets according to claim 1, characterized in that: The locking assembly also includes a threaded connecting rod (2) for securing the mounting base (1) to the test equipment.

4. The dynamic impact testing fixture for polycrystalline diamond composite sheets according to claim 1, characterized in that: The gasket group (6) consists of two gaskets.

5. The dynamic impact testing fixture for polycrystalline diamond composite sheets according to claim 1, characterized in that: The positioning block (4) has a U-shaped structure.

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