A combined laser cladding layer shear strength testing device and method

Abstract

The present invention discloses a combined laser cladding layer shear strength testing device and method, belonging to the field of laser cladding layer performance testing. The device is composed of split components, mainly including a base, a clamping device, a shear cylinder, and connection and adjustment components, etc. The clamping device has two different forms of structures, which are respectively assembled by different components, applicable to test objects of different sizes, and the two can be nested and combined. At the same time, the cladding layers of test objects of different sizes are processed into different forms, so that one-time or continuous multiple shear tests can be realized after the test objects are clamped. This device converts the pressure applied by the loading device into the shear force of the shear edge on the shear wall on the cladding layer, thereby realizing the testing of the shear strength of the cladding layer. It has the advantages of simple operation and convenient data collection, and also ensures the accuracy, unity, and practicability of the data, and can be applied to the testing of the shear strength of the laser cladding layer.

Description

Technical Field

[0001] The present invention is a combined laser cladding layer shear strength testing device and method, which is mainly applied to the shear strength testing of laser cladding layers and belongs to the field of laser cladding layer performance testing. Background Art

[0002] As an emerging surface modification technology, laser cladding technology achieves the purpose of surface modification or repair by presenting good metallurgical bonding with the substrate. Compared with traditional surface strengthening means, it has the advantages of small workpiece deformation, high machining accuracy, environmental protection, etc., and has been widely applied in the engineering field. The bonding strength between the laser cladding layer and the substrate is one of the important indicators for evaluating the quality of the laser cladding process, and it is also an important guarantee for enhancing the performance and extending the life of the cladded parts. Therefore, it is particularly important to detect the bonding strength between the laser cladding layer and the substrate.

[0003] The existing technical solutions perform shear strength tests on the cladding layer, and the cladding layer is peeled off from the substrate by applying pressure to the cladding layer. Although it is applicable to laser cladding layers with ultra-strong metallurgical bonding, the pre-treatment and clamping processes of the test objects are cumbersome, and there are easily errors in the processing process and clamping errors in the test process among multiple test objects of the same type, resulting in the universality and accuracy of the data after each test not being guaranteed. Summary of the Invention

[0004] The purpose of the present invention is to provide a combined laser cladding layer shear strength testing device and method to improve the accuracy and efficiency of detecting the bonding strength of laser cladding layers, simplify the operation process, and facilitate data collection.

[0005] To solve the above technical problems, the specific technical solutions adopted by the present invention are as follows.

[0006] A combined laser cladding layer shear strength testing device includes an upper base (1), an upper base connecting plate (2), an adjusting element (3), a shear box (4), a fixed wall (5), a connecting wall A (6-1), a connecting wall B (6-2), a lower base (7), a shear wall (8), a shear edge (8-1), a fastening element (9), a baffle (10), a connecting element (11), a clamping box (13), a positioning element (14), a fixing element (15), and an adjusting block (16); its characteristics also include: two combined clamping devices composed of different components, and a combined shear cylinder;

[0007] The combined clamping device includes: an adjusting element (3), a shear box (4), a fastening element (9), a baffle (10), a connecting element (11), a clamping box (13), and an adjusting block (16); the baffle (10) and the shear box (4) are detachably connected through the connecting element (11), the shear box (4) and the shear cylinder are in clearance fit, the clamping box (13) is located in the shear box (4) and is in clearance fit with the inner cavity of the shear box (4), the adjusting block (16) and the shear box (4) are in clearance fit, the adjusting element (3) and the fastening element (9) are movably connected to the wall of the shear box (4), the fastening element (9) and the wall of the clamping box (13) are movably connected, the end face of the fastening element (9) contacts the outer wall of the clamping box (13), and the end faces of the adjusting element (3) and the fastening element (9) are in close contact with the outer wall of the clamping box (13);

[0008] The combined shear cylinder is composed of a shear wall (8), a fixed wall (5), a connecting wall A (6-1), and a connecting wall B (6-2), and the connecting wall A (6-1) and the connecting wall B (6-2) are fixedly connected to the shear wall (8) and the fixed wall (5) respectively;

[0009] The combined clamping device and the combined shear cylinder are in clearance fit;

[0010] The upper base connecting plate (2) is fixedly connected to the shear box (4) and the upper base (1) respectively, and the shear wall (8) and the fixed wall (5) are fixed to the lower base (7) through the fixing element (15).

[0011] The combined clamping device is a combined nested structure, and there are two combination schemes, namely combination scheme 1 and combination scheme 2, for test objects (12) in different size ranges, corresponding to two clamping devices constituting the two combination schemes;

[0012] Combination scheme 1 is a clamping device composed of an adjusting element (3), a shear box (4), a baffle (10), a clamping box (13), a connecting element (11), and a fastening element (9); combination scheme 2 is a clamping device composed of an adjusting element (3), a shear box (4), a baffle (10), an adjusting block (16), a connecting element (11), and a fastening element (9).

[0013] A combined laser cladding layer shear strength test method is characterized in that: according to test objects (12) of different sizes, the combined clamping device has two combination schemes, namely combination scheme 1 and combination scheme 2; the two combination schemes can be nested and combined, and for test objects (12) of different sizes, different positioning and clamping schemes and different test methods are provided in combination with different clamping device combination schemes;

[0014] Test of the combination scheme 1: Place the test object (12) in the clamping box (13). The test object (12) is positioned close to the inner wall of the clamping box (13). The fixing element (9) cooperating with the wall of the clamping box (13) clamps the test object (12) in the horizontal and vertical directions. Then, place the clamping box (13) containing the test object (12) in the shearing box (4). Connect the baffle (10) and the shearing box (4) with the connecting element (11). The clamping box (13) is positioned horizontally close to the baffle (10). The adjusting element (3) and the fixing element (9) cooperating with the shearing box (4) clamp the clamping box (13) in the horizontal and vertical directions respectively.

[0015] Test of the combination scheme 2: Place the test object (12) directly in the shearing box (4). Connect the baffle (10) and the shearing box (4) with the connecting element (11). The test object (12) is positioned horizontally close to the baffle (10). Push the adjusting block (16) by adjusting the adjusting element (3) cooperating with the shearing box (4) to clamp the test object (12) in the horizontal direction, and adjust the fixing element (9) cooperating with the shearing box (4) to clamp the test object (12) in the vertical direction.

[0016] For the test objects (12) of different sizes, process the cladding layer (12-1) on the surface of the test object (12) into different shapes, and conduct a single shear test or multiple consecutive shear tests on the cladding layers (12-1) of different shapes during the test after clamping. During the shearing test, the shearing box (4) is rigidly connected with the loading device through connecting components such as the upper base connecting plate (2) and the upper base (1), and the up-and-down reciprocating motion of the shearing box (4) is realized by controlling the loading device. The clamping box (13) and the shearing box (4) have a clearance fit, the shearing box (4) and the shearing cylinder have a clearance fit, and the shearing edge (8-1) on the shearing wall (8) and the shearing box (4) have a clearance fit. During the experiment, the pressure applied to the fixture box body is converted into the shearing force applied by the shearing edge (8-1) on the cladding layer (12-1).

[0017] The present invention has beneficial effects. The test device of the present invention converts the pressure applied by the loading device to the shearing box into the pressure applied by the shearing edge to the laser cladding layer, so that the cladding layer is sheared off from the substrate at the bonding surface with the substrate, thereby realizing the detection of the bonding strength of the laser cladding layer. For test objects of different sizes, different structural clamping device combination schemes and corresponding test methods are designed. Through one-time clamping of the test object, one or multiple consecutive shear strength tests can be completed, avoiding test data errors caused by processing errors and clamping errors between the same type of test objects, and ensuring the accuracy, unity, and applicability of the test data of the shear strength of the laser cladding layer while improving the test efficiency. Brief Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the test device of the present invention.

[0019] Figure 2 is an assembly and clamping schematic diagram of the clamping device combination scheme 1 of the present invention and the test object.

[0020] Figure 3 is an assembly and clamping schematic diagram of the clamping device combination scheme 2 of the present invention and the test object.

[0021] Figure 4 is an example diagram of the test object of size type 1 of the present invention.

[0022] Figure 5 is an example diagram of the test object of size type 2 of the present invention.

[0023] In the figure: 1. upper base, 2. upper base connecting plate, 3. adjusting element, 4. shear box, 5. fixed wall, 6-1. connecting wall A, 6-2. connecting wall B, 7. lower base, 8. shear wall, 8-1. shear edge, 9. fastening element, 10. baffle, 11. connecting element, 12. test object, 12-1. cladding layer, 13. clamping box, 14. positioning element, 15. fixing element, 16. adjusting block. Detailed Description of the Invention

[0024] The technical solution of the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] As Figure 1 shown, the main body of the laser cladding layer bonding strength test device in the present invention is rectangular in shape, and is mainly composed of connection and transition components such as an upper base 1, an upper base connecting plate 2 and a lower base 7, a clamping device, a shear cylinder, a positioning element 14 and a fixing element 15. The upper base 1 is connected to the upper base connecting plate 2 through the fixing element 15 and then connected to the loading device. The top of the shear box 4 is connected to the upper base connecting plate 2 through the fixing element 15. The shear cylinder is composed of a connecting wall A 6-1, a connecting wall B 6-2, a fixed wall 5 and a shear wall 8 connected by the fixing element 15, and is integrally fixed on the lower base 7. The clamping device is divided into two different structures according to the different sizes of the clamped test object 12, and the side walls of the clamping device are all in clearance fit with the shear cylinder. During the laser cladding layer shear strength test, the test object 12 gradually enters the shear cylinder along with the clamping device, and the entire shear test process of the cladding layer 12-1 is completed.

[0026] From Figure 2 , Figure 3 , Figure 4 , Figure 5It can be seen that for two test objects with different sizes, the clamping devices are respectively composed of different component combinations, and the shapes and testing methods of the cladding layers 12-1 of the test object 12 are also different. The following will separately combine Figure 2 and Figure 4 , Figure 3 and Figure 5 to illustrate with two embodiments.

[0027] Embodiment 1

[0028] As Figure 2 shown, for the test object 12 of size type 1, the clamping device is composed of an adjusting element 3, a shearing box 4, a clamping box 13, a baffle 10, a connecting element 11 and a fastening element 9. The test object 12 is placed in the clamping box 13, and the test object 12 is horizontally positioned through the inner rear wall of the clamping box 13. The two fastening elements 9 are in movable fit with the wall of the clamping box 13, and the end faces of the fastening elements 9 are in contact with the surface of the test object 12, respectively clamping the test object 12 in the horizontal and vertical directions. Then, the clamping box 13 containing the test object 12 is placed in the shearing box 4, the baffle 10 and the shearing box 4 are connected through the connecting element 11, and the clamping box 13 is horizontally positioned close to the baffle 10. The adjusting element 3 and the fastening element 9 are in movable fit with the wall of the shearing box 4, and the end faces are in contact with the outer wall of the clamping box 13, respectively clamping the clamping box 13 in the horizontal and vertical directions. There is a clearance fit between the test object 12 and the clamping box 13, and there is a clearance fit between the clamping box 13 and the shearing box 4. The shape of the cladding layer 12-1 of the test object 12 of size type 1 is as Figure 4 shown, and each test object only undergoes a shearing test on the cladding layer 12-1 once.

[0029] Embodiment 2

[0030] As Figure 3 shown, for the test object 12 of size type 2, the clamping device is composed of an adjusting element 3, a shearing box 4, a fastening element 9, a baffle 10, a connecting element 11 and an adjusting block 16. The test object 12 is directly placed in the shearing box 4, the baffle 10 and the shearing box 4 are connected through the connecting element 11, and the test object 12 is horizontally positioned close to the baffle 10. The adjusting block 16 is pushed to clamp the test object 12 in the horizontal direction by adjusting the adjusting element 3 that cooperates with the shearing box 4, and the test object 12 is clamped in the vertical direction by adjusting the fastening element 9 that cooperates with the shearing box 4. The cladding layer 12-1 of the test object 12 of size type 2 is processed into multiple parts, as Figure 5 shown, and through one clamping of the test object 12, continuous multiple shearing strength tests on the cladding layer 12-1 are completed during the continuous downward movement of the test object 12.

[0031] The working process of the present invention is as follows.

[0032] Process 1: Connect the shear box 4 to the upper base connecting plate 2, and then connect the upper base connecting plate 2 to the upper base 1.

[0033] Process 2: Clamping of the test object 12

[0034] 2.1 For Figure 4 the test object 12 of the shown dimension type 1, the clamping of the test object 12 refers to Figure 2

[0035] Load the test object 12 into the clamping box 13 and clamp it with the fastening element 9;

[0036] Place the clamping box 13 with the test object 12 loaded in it into the shear box 4;

[0037] Connect the baffle 10 to the shear box 4 through the connecting element 11;

[0038] Clamp the clamping box 13 with the test object 12 loaded in it by adjusting the adjusting element 3 and the fastening element 9.

[0039] 2.2 For Figure 5 the test object 12 of the shown dimension type 2, the clamping of the test object 12 refers to Figure 5

[0040] Load the adjusting block 16 and the test object 12 into the shear box 4 successively;

[0041] Connect the baffle 10 to the shear box 4 through the connecting element 11;

[0042] Clamp the test object 12 by adjusting the adjusting element 3 and the fastening element 9.

[0043] Process 3: Install the connecting wall A 6-1 and the connecting wall B 6-2 on the lower base 7, and then connect the fixed wall 5 and the shear wall 8 to the connecting wall A 6-1 and the connecting wall B 6-2 to form a shear cylinder.

[0044] Process 4: Install the upper base 1 and the lower base 7 on the loading device and fix them respectively.

[0045] Process 5: Control the upper base 1 to drive the test object 12 to move downward to complete the shearing of the cladding layer 12-1.

[0046] Process 6: Lift the upper base 1, remove the baffle 10, and replace the test object 12:

[0047] 6.1 For the test object 12 of dimension type 1: Take out the clamping box 13, loosen the fastening element 9 cooperating with the clamping box 13, replace the test object 12, and then clamp the test object 12 according to the above "2.1" steps.

[0048] 6.2 For the test object 12 of dimension type 2: Replace the test object 12, and then clamp the test object 12 according to the above "2.2" steps.

[0049] Process Seven: Continue the cladding layer shear strength test.

Claims

1. A combined laser cladding layer shear strength testing device, comprising an upper base (1), an upper base connecting plate (2), an adjusting element (3), a shear box (4), a fixed wall (5), a connecting wall A (6-1), a connecting wall B (6-2), a lower base (7), a shear wall (8), a shear edge (8-1), a fastening element (9), a baffle (10), a connecting element (11), a clamping box (13), a positioning element (14), a fixing element (15) and an adjusting block (16); and further characterized by: Combined shearing cylinder and two combined clamping devices composed of different components; The combined clamping device is a combined nested structure. There are two combination schemes, namely combination scheme 1 and combination scheme 2, for test objects (12) in different size ranges, corresponding to two clamping devices constituting the two combination schemes; Combination scheme 1: The clamping device is composed of an adjusting element (3), a shearing box (4), a baffle (10), a clamping box (13), a connecting element (11) and a fastening element (9); Place the test object (12) in the clamping box (13), and the test object (12) is positioned close to the inner wall of the clamping box (13). The fastening element (9) cooperating with the wall of the clamping box (13) clamps the test object (12) in the horizontal and vertical directions. Then place the clamping box (13) containing the test object (12) in the shearing box (4), connect the baffle (10) and the shearing box (4) with the connecting element (11), and the clamping box (13) is positioned horizontally close to the baffle (10). The adjusting element (3) and the fastening element (9) cooperating with the shearing box (4) clamp the clamping box (13) in the horizontal and vertical directions respectively; Combination scheme 2: The clamping device is composed of an adjusting element (3), a shearing box (4), a baffle (10), an adjusting block (16), a connecting element (11) and a fastening element (9); Place the test object (12) directly in the shearing box (4), connect the baffle (10) and the shearing box (4) with the connecting element (11), and the test object (12) is positioned horizontally close to the baffle (10). Push the adjusting block (16) by adjusting the adjusting element (3) cooperating with the shearing box (4) to clamp the test object (12) in the horizontal direction, and adjust the fastening element (9) cooperating with the shearing box (4) to clamp the test object (12) in the vertical direction; The combined shearing cylinder is composed of a shearing wall (8), a fixed wall (5), a connecting wall A (6 - 1) and a connecting wall B (6 - 2). The connecting wall A (6 - 1) and the connecting wall B (6 - 2) are fixedly connected to the shearing wall (8) and the fixed wall (5) respectively; The combined clamping device and the combined shearing cylinder are in clearance fit; The upper base connecting plate (2) is fixedly connected to the shearing box (4) and the upper base (1) respectively, and the shearing wall (8) and the fixed wall (5) are fixed to the lower base (7) through the fixing element (15).

2. The testing method of a combined laser cladding layer shear strength testing device according to claim 1, characterized in that: According to test objects (12) of different sizes, the combined clamping device has two combination schemes, namely combination scheme 1 and combination scheme 2; The two combination schemes can be nested and combined, and for test objects (12) of different sizes, different positioning and clamping schemes and different test methods are provided in combination with different clamping device combination schemes; Test of the combination scheme 1: Place the test object (12) in the clamping box (13). The test object (12) is positioned close to the inner wall of the clamping box (13). The set screw element (9) cooperating with the wall of the clamping box (13) clamps the test object (12) in the horizontal and vertical directions. Then, place the clamping box (13) containing the test object (12) in the shearing box (4). Connect the baffle (10) and the shearing box (4) with the connecting element (11). The clamping box (13) is positioned horizontally close to the baffle (10). The adjusting element (3) and the set screw element (9) cooperating with the shearing box (4) clamp the clamping box (13) in the horizontal and vertical directions respectively. Test of the combination scheme 2: Place the test object (12) directly in the shearing box (4). Connect the baffle (10) and the shearing box (4) with the connecting element (11). The test object (12) is positioned horizontally close to the baffle (10). Push the adjusting block (16) by adjusting the adjusting element (3) cooperating with the shearing box (4) to clamp the test object (12) in the horizontal direction, and adjust the set screw element (9) cooperating with the shearing box (4) to clamp the test object (12) in the vertical direction.

3. The test method according to claim 2, wherein: For the test objects (12) of different sizes, process the cladding layer (12-1) on the surface of the test object (12) into different shapes, and conduct a single shearing test or multiple consecutive shearing tests on the cladding layers (12-1) of different shapes during the test after clamping.

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