Adjustable shearing tool

Abstract

The invention discloses an adjustable shearing tool which comprises an upper plate, a lower plate, an upper positioning module, a lower positioning module, an upper clamping module, a lower clamping module, an upper adjusting module, a lower adjusting module, a bonding area, a connecting threaded rod, an upper internal thread connector, a lower internal thread connector and a hydraulic clamp. The threaded rod is connected with the V-shaped hydraulic clamp; an internal thread joint is arranged at the lower end of the lower adjusting module and is connected with the V-shaped hydraulic clamp through a threaded rod; the upper clamping module and the lower clamping module are respectively fixed on the upper adjusting module and the lower adjusting module through positioning pins, and the upper positioning module and the lower positioning module are respectively fixed on the upper clamping module and the lower clamping module through pins; the adjusting screw is connected with a handle, the handle is rotated to adjust the sample clamping position, and it is guaranteed that the center line of the sample bonding face is consistent with the load applying direction. According to the tool, the test safety is improved, and the risk of breaking and flying out in the test process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of material detection, and in particular to an adjustable shearing tool. Background Art

[0002] The grain of a solid rocket engine is connected to the composite combustion chamber shell mainly through a bonding interface. Most non-metallic shell models involve interface shear performance testing tasks. There are many types of adhesives and composite bonding materials currently used, involving various types of interface bonding shear specimens. The shear performance of the interface directly affects the structural integrity and working reliability of the engine. Through shear tests, the stress state of the bonding interface between the grain and the shell can be simulated, and the bonding strength and destructive performance of the bonding interface can be evaluated, thereby ensuring the stable operation of the engine under complex stress conditions. On the other hand, the results of the shear test can provide an important basis for the design of the engine and the selection of materials. By analyzing the shear properties of different materials, materials with better performance and lower cost can be selected; at the same time, optimizing the engine structure according to the test results can improve the overall performance and reliability of the engine.

[0003] The existing shear test is to place the sample between the upper and lower fixtures through a material testing machine, and bear loads of equal size, opposite direction, and close action lines, so as to cause the bonded part to shift along the shear surface. According to the standard QJ2038.2, "During the shear tensile test, the bonding surface should be parallel to the axis of the test fixture, so that the long axis of the sample is consistent with the direction of the tension applied by the center line of the fixture." The existing shear test can keep the center line of the bonding surface of the sample consistent with the direction of the applied tension when conducting a sample with a thinner bonding interface, but for some samples with a thicker bonding interface, the shear surface and the bonding interface are not on the same axis, resulting in the test results not meeting the requirements.

[0004] The existing shear test cannot completely ensure that the direction of the applied load is consistent with the center line of the bonding interface. When the load direction and the shear surface do not coincide, the distribution of the shear force on the specimen will become uneven. This will cause the stress state of the specimen to be inconsistent with the actual working conditions, thereby affecting the accuracy of the test results. In addition, stress concentration in local areas of the specimen will also cause the specimen to fail prematurely and fail to reflect the true shear strength of the material. On the other hand, the existing tooling cannot flexibly adapt to specimens of different thicknesses, and it is necessary to prepare tooling of various specifications to accommodate specimens of different thicknesses. Summary of the invention

[0005] In order to solve the above-mentioned problems existing in the existing shear test, the present invention provides an adjustable shear fixture to solve the problem that the existing shear test fixture cannot flexibly adapt to the test of samples of different thicknesses, and the shear force of the existing shear test is unevenly distributed on the sample, resulting in the stress state of the sample being inconsistent with the actual working conditions, affecting the test accuracy and other problems.

[0006] In order to solve the above technical problems, one of the purposes of the present invention is to provide an adjustable shearing tool, including: an upper plate 1, a lower plate 2, an upper positioning module 3, a lower positioning module 4, an upper clamping module 5, a lower clamping module 6, an upper adjustment module 7, a lower adjustment module 8, a handle 9, a bonding area 10, a pin 11, a connecting threaded rod 12, a positioning pin 13, an upper internal thread joint 14, a lower internal thread joint 15, a pin hole 16, a positioning pin hole 17 and a hydraulic clamp 18,

[0007] The upper end of the upper adjustment module 7 is provided with an internal threaded joint 14, which is connected to the V-shaped hydraulic clamp 18 through a threaded rod; the lower end of the lower adjustment module 8 is provided with an internal threaded joint 15, which is connected to the V-shaped hydraulic clamp 18 through a threaded rod;

[0008] The upper clamping module 5 and the lower clamping module 6 are respectively fixed to the upper adjustment module 7 and the lower adjustment module 8 by means of positioning pins 13, and the upper positioning module 3 and the lower positioning module 4 are respectively fixed to the upper clamping module 5 and the lower clamping module 6 by means of pins 11;

[0009] The adjusting screw 12 is connected to the handle 9, and the handle is turned to adjust the sample clamping position to ensure that the center line of the sample bonding surface is consistent with the direction of the applied load;

[0010] The sample is made by bonding two parallel plates. Small holes are punched on the edges of the upper plate 1 and the lower plate 2. The positioning module is provided with a pin hole 16. The upper and lower plates of the sample are connected to the positioning module through the pin hole to ensure that the sample does not move laterally and the coaxiality is guaranteed.

[0011] Furthermore, the clamping module is used to connect the upper and lower clamp components together, and is usually made of a material with high strength and good wear resistance.

[0012] Furthermore, the clamping module is selected to be stainless steel or alloy steel in a mesh form to ensure sufficient clamping force.

[0013] Furthermore, the shear force is ensured to coincide with the center of the specimen bonding interface, which can minimize the lateral force or torsional force on the specimen, thereby obtaining more realistic and reliable data.

[0014] Furthermore, during operation, the left and right adjustable clamping blocks are adjusted according to the specimens of different plate thicknesses, thereby achieving clamping and fixing of specimens of different sizes.

[0015] Based on the same inventive concept, the present invention also provides a method for adjustable shearing tooling, and the specific steps are as follows:

[0016] S1: Screw the upper threaded rod and the lower threaded rod into the internal threaded joint at the upper end of the upper adjustment module and the internal threaded joint at the lower end of the lower adjustment module respectively, connect the threaded rod to the V-shaped hydraulic clamp, clamp the upper positioning module and the lower positioning module into the upper clamping module and the lower clamping module respectively, turn the handle to ensure that the sample is tightly combined with the clamp, connect the upper plate of the sample with the upper positioning module, install the sample in the pin hole of the clamp, turn the handle to align the center of the bonding surface with the center of the threaded rod, and finally turn the handle to connect the lower plate of the sample with the lower positioning module through the pin;

[0017] S2: Ensure that the shear force always coincides with the center line of the bonding interface of the specimen during the shear test to prevent the specimen from deflecting during stretching, which would result in inaccurate shear strength measurement. Set the test rate and stop conditions in the test machine control software, apply the load at a constant rate or constant strain rate, apply shear force to the bonding surface of the specimen until failure, and record the force and displacement data during the test to determine its shear strength;

[0018] S3: After the test, release the hydraulic clamp at the bottom of the testing machine and the operator takes out the sample.

[0019] The above one or more technical solutions of the present invention have at least one or more of the following technical effects:

[0020] The tooling of the present invention ensures that the direction of the applied load during the shear test is consistent with the center line of the bonding interface, effectively preventing the lateral movement of the sample and stress concentration during the test, and ensuring the accuracy and reliability of the test results;

[0021] The tooling of the present invention greatly expands the applicable scope of the clamp, so that a set of tooling can adapt to joints of various sizes, thereby improving the utilization rate and economic benefits of the equipment;

[0022] The tooling of the present invention enables test personnel to perform shear tensile tests more quickly and conveniently without frequently replacing tooling or adjusting fixtures, which not only saves time and labor costs, but also improves the efficiency and accuracy of the test;

[0023] The tooling of the present invention can improve the safety of the test, ensure the accurate transmission of the shear force and the stable clamping of the sample, and can reduce the risks of breakage, flying out, etc. occurring during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 : Schematic diagram of the adjustable shearing tool structure of the present invention;

[0025] Figure 2: A cross-sectional view of the adjustable shearing tool of the present invention;

[0026] Figure 3 : Front view of the working state of the adjustable shearing tool of the present invention;

[0027] Among them: 1-upper plate, 2-lower plate, 3-upper positioning module, 4-lower positioning module, 5-upper clamping module, 6-lower clamping module, 7-upper adjustment module, 8-lower adjustment module, 9 handle, 10-bonding area, 11-pin, 12-connecting threaded rod, 13-locating pin, 14-upper internal thread joint, 15-lower internal thread joint, 16-pin hole, 17-locating pin hole, 18-hydraulic clamp. Specific implementation plan

[0028] The present invention designs an adjustable shearing tool, including a clamping module, a positioning module, and an adjustment module, and the modules are combined together by a detachable or adjustable connection method. The clamping module is used to connect the upper and lower clamp components together, and is usually made of high-strength and wear-resistant materials, such as stainless steel or alloy steel in a mesh form, to ensure sufficient clamping force; the positioning module is used to ensure the accurate position of the sample in the clamp to prevent the sample from lateral displacement or sliding during the test: the function of the adjustment module is mainly to flexibly adjust according to the samples of different plate thicknesses, so as to achieve clamping and fixation of samples of different sizes.

[0029] The upper and lower adjustment modules of the present invention can position the upper and lower overlap plates to prevent them from sliding laterally, ensure coaxiality, and ensure that the test is carried out quickly and accurately. The problem that the tooling has a small application range and a set of tooling is only applicable to one size of specimen is solved. The left and right adjustable clamping blocks can be flexibly adjusted according to specimens of different plate thicknesses, thereby realizing the test of specimens of different sizes with a set of tooling.

[0030] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the embodiments of the present invention and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the obtained embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0031] The present invention designs an adjustable shearing tool, which includes an upper plate 1, a lower plate 2, an upper positioning module 3, a lower positioning module 4, an upper clamping module 5, a lower clamping module 6, an upper adjustment module 7, a lower adjustment module 8, a handle 9, a bonding area 10, a pin 11, a connecting threaded rod 12, a positioning pin 13, an upper internal thread joint 14, a lower internal thread joint 15, a pin hole 16, a positioning pin hole 17, and a hydraulic clamp 18.

[0032] The upper end of the upper adjustment module 7 and the lower end of the lower adjustment module 8 are both provided with internal threaded joints. The upper adjustment module 7 is connected to the threaded rod through the upper internal threaded joint 14, and the lower adjustment module 8 is connected to the threaded rod through the lower internal threaded joint 15. The threaded rod is connected to the V-shaped hydraulic clamp 18.

[0033] The clamping module 5 below the upper adjustment module 7 is connected to the upper positioning module 3, and the clamping module 6 above the lower adjustment module 8 is connected to the lower positioning module 4. The positioning pins 13 on both sides of the adjustment module ensure that the clamping block is fixed in the vertical direction. The adjusting screw 12 is connected to the handle 9. The operator adjusts the clamping position of the sample by turning the handle to ensure that the center line of the sample bonding surface is consistent with the direction of applied load, so as to adjust according to samples of different thicknesses to ensure that the shear force and the center of the sample bonding interface coincide, thereby preventing the sample from being damaged prematurely due to lateral force and obtaining invalid data.

[0034] The sample is made by bonding two parallel plates. Small holes are punched on the edges of the upper plate 1 and the lower plate 2. The positioning module is provided with a pin hole 16. The upper and lower plates of the sample are connected to the positioning module through the pin hole to ensure that the sample does not move laterally and the coaxiality is guaranteed.

[0035] When in use, screw the upper threaded rod and the lower threaded rod into the upper internal threaded joint of the upper adjustment module and the lower internal threaded joint of the lower adjustment module respectively, connect the threaded rod to the V-type hydraulic clamp, clamp the upper positioning module and the lower positioning module into the upper clamping module and the lower clamping module respectively, turn the handle to ensure that the sample is tightly combined with the clamp, connect the upper plate of the sample with the upper positioning module, install the sample in the pin hole of the clamp, turn the handle to align the center of the bonding surface with the center of the threaded rod, and finally turn the handle to connect the lower plate of the sample with the lower positioning module through the pin to ensure that the shear force always coincides with the center line of the bonding interface of the sample during the shear test to prevent the sample from deflecting during stretching, resulting in inaccurate shear strength. Apply load to test, apply shear force to the sample until it is destroyed to measure its shear strength. After the test, release the hydraulic clamp below the test machine and the operator takes out the sample.

[0036] The present invention ensures that the shear force and the center of the sample bonding interface coincide, which can minimize the lateral force or torsional force on the sample, thereby obtaining more realistic and reliable data. Through the multi-point contact and evenly distributed clamping method, it can ensure that the sample is subjected to uniform and stable force during the shearing process, reducing the interruption of the test due to premature damage to the sample. The left and right adjustable clamping blocks can be flexibly adjusted according to samples of different plate thicknesses, thereby achieving clamping and fixing of samples of different sizes.

[0037] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An adjustable shearing tool, characterized in that: include: An upper plate (1), a lower plate (2), an upper positioning module (3), a lower positioning module (4), an upper clamping module (5), a lower clamping module (6), an upper adjustment module (7), a lower adjustment module (8), a handle (9), a bonding area (10), a pin (11), a connecting threaded rod (12), a positioning pin (13), an upper internal thread joint (14), a lower internal thread joint (15), a pin hole (16), a positioning pin hole (17) and a hydraulic clamp (18), The upper end of the upper adjustment module (7) is provided with an internal thread joint (14), which is connected to a V-shaped hydraulic clamp (18) via a threaded rod; the lower end of the lower adjustment module (8) is provided with an internal thread joint (15), which is connected to the V-shaped hydraulic clamp (18) via a threaded rod; The upper clamping module (5) and the lower clamping module (6) are respectively fixed to the upper adjustment module (7) and the lower adjustment module (8) via positioning pins (13); the upper positioning module (3) and the lower positioning module (4) are respectively fixed to the upper clamping module (5) and the lower clamping module (6) via pins (11); The adjusting screw (12) is connected to the handle (9), and the handle is rotated to adjust the sample clamping position to ensure that the center line of the sample bonding surface is consistent with the direction of applied load; The sample is made by bonding two parallel plates. Small holes are punched on the edges of the upper plate (1) and the lower plate (2). The positioning module is provided with a pin hole (16). The upper and lower plates of the sample are connected to the positioning module through the pin hole to ensure that the sample does not move laterally and the coaxiality is ensured.

2. The adjustable shearing tool according to claim 1, characterized in that: The clamping module is used to connect the upper and lower clamp components together, and is usually made of a high-strength, wear-resistant material.

3. The adjustable shearing tool according to claim 2, characterized in that: The clamping module is selected to be stainless steel or alloy steel in a mesh form to ensure sufficient clamping force.

4. The adjustable shearing tool according to claim 1, characterized in that: By ensuring that the shear force and the center of the specimen bonding interface coincide, the lateral force or torsional force on the specimen can be minimized, thereby obtaining more realistic and reliable data.

5. The adjustable shearing tool according to claim 1, characterized in that: During operation, the left and right adjustable clamps are adjusted according to the specimens of different plate thicknesses, thereby achieving clamping and fixing of specimens of different sizes.

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