A detection device and detection method for the bonding strength of a bimetallic sheet

Abstract

The present invention provides a detection device for the bonding strength of bimetallic sheets, which comprises: an intermediate ball die holder, a specimen clamping assembly, and a cutting tool. The intermediate ball die holder includes an upper template and a lower template arranged horizontally. The upper template and the lower template are movably connected through a movable connecting member, and the upper template can move up and down relatively. A positioning and fixing block is arranged on the upper end surface of the lower template, and the specimen clamping assembly is installed on the positioning and fixing block. The specimen clamping assembly is used for clamping the specimen. A cutting tool fixing block is arranged on the lower end surface of the upper template, and the cutting tool is installed on the cutting tool fixing block. The cutting tool is used for shearing the specimen. Taking the bimetallic material of steel back and copper alloy as an example, this detection device is applicable to detecting the bonding strength of bimetallic materials with a steel back layer thickness ≥ 2 mm and a copper alloy layer thickness ≥ 0.5 mm. The operation is simple, the influence of other external interference factors is reduced, the repeatability of the test results is good, and the measured data is more accurate and reliable.

Description

Technical Field

[0001] The present invention relates to the field of performance testing of bimetallic sheets, and particularly to a detection device and a detection method for the bonding strength of the bonding interface of bimetallic sheets. Background Art

[0002] Composite materials are composed of two or more layers of metals with different properties. Due to their excellent comprehensive properties that the original single materials do not have, they have broad application prospects in fields such as aerospace, petrochemical, metallurgy, automotive, shipbuilding, electric power, medicine and health, environmental protection, nuclear energy, and household appliances.

[0003] There are many indicators to measure the quality of metal composite plates. Common indicators include shear strength, bonding strength, degree of combination, yield strength, tensile strength, etc. Among them, shear strength can best illustrate the level of the interface bonding strength of metal composite plates, so it is used most frequently. The test method and shear test equipment for the shear strength of metal laminated composite plates are specified in GB / T6396 - 2008. In the regulations of GB / T6396 - 2008 for shear tests, metal composite plate products are divided into two categories: those with a total composite plate thickness less than or equal to 10mm and those with a total thickness greater than 10mm. When the total thickness of the composite plate is relatively thin (specified in the standard as less than or equal to 10mm), its matrix will undergo bending deformation under pressure, affecting the test accuracy, and even completely unable to measure the shear strength value. At this time, GB / T6396 - 2008 stipulates that the shear strength is tested by the method of tension-shear, but this method is only applicable to the case where the cladding layer is relatively thick. When the cladding layer is thin, the weakest part is prone to bending and fracture during the tension-shear process, affecting the test accuracy and even causing the test to fail. There are also other detection methods in the industry, all of which have some additional influencing factors, such as type of test specimen, where the vertical long strip represents one of the metal matrices, such as the steel backing layer, and the small protrusion in the middle represents the attached metal layer (such as the copper alloy layer). The attached metal layer around it is processed and removed. This kind of test specimen is complex to process, and it is difficult to ensure that most of the area of one metal can be milled away. Both milling too shallow and too deep will affect the final test results. Moreover, there will inevitably be the influence of friction between the specimen and the tooling. Therefore, the present invention provides a detection device and a detection method for the bonding strength of bimetallic sheets that can solve the above problems. Summary of the Invention

[0004] To solve the deficiencies of the prior art, the object of the present invention is to provide a detection device and a detection method for the bonding strength of the bonding interface of a bimetallic sheet, which can quickly and accurately measure the bonding strength of the bimetallic sheet. Taking a bimetallic material of steel back and copper alloy as an example, this detection device is applicable to detecting the bonding strength of a bimetallic sheet with a steel back layer thickness ≥ 2 mm and a copper alloy layer thickness ≥ 0.5 mm. It is simple to operate, reduces the influence of external interference factors, and the measured data is more accurate.

[0005] To achieve the above technical object, the technical solution adopted by the present invention is as follows.

[0006] A detection device for the bonding strength of a bimetallic sheet, which includes: an intermediate ball mold frame, a specimen clamping assembly, and a cutter. The intermediate ball mold frame includes an upper template and a lower template arranged horizontally. The upper template and the lower template are movably connected through a movable connecting piece, and the upper template can move up and down relatively;

[0007] A positioning and fixing block is arranged on the upper end surface of the lower template, and the specimen clamping assembly is installed on the positioning and fixing block. The specimen clamping assembly is used for clamping the specimen;

[0008] A cutter fixing block is arranged on the lower end surface of the upper template, and the cutter is installed on the cutter fixing block. The cutter is used for shearing the specimen.

[0009] As a further improvement of the present invention, the movable connecting piece includes a guide post vertically and fixedly arranged between the upper template and the lower template, and a guide post sleeve vertically and fixedly arranged on the upper template. The upper template is movably sleeved on the guide post through the guide post sleeve; its significance lies in that under the action of the guide post sleeve, the upper template can maintain a relatively up and down movement with small frictional resistance and high movement accuracy;

[0010] Two groups of the movable connecting pieces are provided and are respectively located at both ends of the upper template.

[0011] As a further improvement of the present invention, a plurality of first threaded holes are opened on the lower template, and a plurality of first counterbore holes corresponding to and matching the first threaded holes are opened on the positioning and fixing block. The positioning and fixing block is fixedly installed on the upper end surface of the lower template by a bolt connection through the cooperation of the first counterbore holes and the first threaded holes;

[0012] A positioning through hole for accommodating the specimen clamping assembly is opened on the positioning and fixing block, and the front end surface of the positioning through hole is on the same horizontal straight line as the movable connecting piece. A third threaded hole communicating with the positioning through hole is opened on the rear end surface of the positioning and fixing block;

[0013] The described specimen clamping assembly is fixedly installed in the positioning through-hole in a pressing manner through the cooperation of the third threaded hole and the screw; the significance lies in that the screw presses the specimen clamping assembly through the third threaded hole provided on the rear end face of the positioning and fixing block, so that the front end face of the specimen clamping assembly is always firmly attached to the front end face of the positioning through-hole of the positioning and fixing block, without any shaking, ensuring that no eccentric load force is generated when the tool presses down, thereby not affecting the test results.

[0014] As a further improvement of the present invention, the described specimen clamping assembly includes an upper chuck, a lower chuck and a fine-tuning component. A plurality of upper through-holes are provided on the upper end face of the upper chuck. A upper semi-circular groove is provided on the lower end face of the upper chuck and penetrates through to the rear end face of the upper chuck;

[0015] A plurality of second threaded holes corresponding to and matching the upper through-holes are provided on the upper end face of the lower chuck. The upper chuck and the lower chuck are fixedly connected by a bolt connection manner through the cooperation of the upper through-holes and the second threaded holes;

[0016] A clamping groove is provided on the upper end face of the lower chuck. A lower semi-circular groove is provided at the intersection of the rear end face of the lower chuck and the bottom of the clamping groove. When the upper chuck and the lower chuck are fixedly connected, the upper semi-circular groove and the lower semi-circular groove are coaxially arranged;

[0017] Two lower threaded holes are provided on the rear end face of the lower chuck.

[0018] As a further improvement of the present invention, the described fine-tuning component includes a boosting piece, a cage and a micrometer. The front face of the cage is in a product shape structure. Three connecting through-holes are provided on the cage and are in a product shape structure among the three connecting through-holes. The two connecting through-holes located below correspond to and match the two lower threaded holes provided on the rear end face of the lower chuck one by one. The cage is fixedly installed on the lower chuck by a bolt installation manner through the cooperation of the two lower threaded holes and the connecting through-holes. The connecting through-hole located above is used to fix the micrometer. When the cage is installed on the lower chuck, the connecting through-hole located above and the upper semi-circular groove are coaxially arranged;

[0019] The described boosting piece is arranged in the clamping groove and is located behind the specimen.

[0020] As a further improvement of the present invention, a plurality of upper threaded holes are provided on the upper end face of the upper template. A plurality of second countersunk holes corresponding to and matching the upper threaded holes are provided on the tool fixing block. The tool fixing block is fixedly installed on the lower end face of the upper template by a bolt connection manner through the cooperation of the second countersunk holes and the upper threaded holes;

[0021] A stepped fixing hole matching the tool is provided at the middle position of the end face of the tool fixing block.

[0022] A detection method for the bonding strength of a bimetallic sheet, the steps of which are as follows:

[0023] S1: Measure the thickness of the copper alloy layer of the sample to be tested, denoted as B;

[0024] S2: Make the sample to be tested into a sample of the standard specimen size;

[0025] S3: Place the sample in the clamping groove of the lower chuck, with the copper alloy layer facing outward. Adjust the micrometer so that the protruding end of the micrometer pushes the booster sheet forward until the surface of the copper alloy layer of the sample is flush with the lower chuck, and record the value of the micrometer at this time. Then, according to the thickness B of the copper alloy layer, screw out the micrometer by a length of B. At this time, the bonding surface between the copper alloy layer and the steel backing layer is exactly flush with the lower chuck. Tighten the bolt to fasten the upper chuck and the lower chuck and clamp the sample;

[0026] S4: Fix and install the upper template of the intermediate ball mold base at the lower pressing end of the precision pressure testing machine, and place the lower template on the working platform of the precision pressure testing machine;

[0027] S5: Put the sample clamping assembly with the sample installed into the positioning through hole of the positioning fixing block, and tighten the screw located on the positioning fixing block so that the sample clamping assembly is always firmly attached to the positioning through hole of the positioning fixing block;

[0028] S6: Adjust the plane of the cutting tool to be parallel to the upper and lower chucks and maintain a small gap. Tighten the tool fixing block to clamp the cutting tool;

[0029] S7: Start the precision pressure testing machine, lower the cutting tool to shear the sample, read the maximum pressure F when the sample is cut off, and calculate the bonding strength P of the bimetallic sheet according to the bonding strength calculation formula: P = F / (L * H), where L in the formula represents the width of the standard sample, and H represents the thickness of the standard sample;

[0030] S8: Repeat the test for 2 - 3 groups of samples and find their average value. This average value is the bonding strength of the bimetallic sheet.

[0031] As a further improvement of the present invention, the telescopic precision of the micrometer is 0.01 mm;

[0032] The sample is placed in the clamping groove of the lower chuck, and the thickness of the sample is higher than the depth of the clamping groove. The significance is that it is convenient to clamp the sample when the upper chuck and the lower chuck are fastened;

[0033] The length of the booster sheet is adjusted accordingly according to the length of the sample, and the thickness of the booster sheet is less than the depth of the clamping groove of the lower chuck. The significance is that it is convenient for the booster sheet to move in the clamping groove.

[0034] As a further improvement of the present invention, the diameter of the upper semi-circular groove provided on the upper chuck is larger than the diameter of the protruding rod of the micrometer, and the depth of the upper semi-circular groove is greater than the maximum stroke of the protruding rod of the micrometer. The diameter of the lower semi-circular groove provided on the lower chuck is larger than the diameter of the protruding rod of the micrometer, and the depth of the lower semi-circular groove is greater than the maximum stroke of the protruding rod of the micrometer.

[0035] As a further improvement of the present invention, the tool includes a tool upper end and a tool long end. The tool upper end has a disc structure, and the tool long end has a round rod structure. The tool upper end and the tool long end are coaxially arranged, and the tool is symmetrically flattened from the two circular axis directions to form two planes.

[0036] The beneficial effects of the present invention compared with the prior art are as follows:

[0037] 1. Taking the bimetallic material of steel back and copper alloy as an example, the present invention is applicable to detecting the bonding strength of bimetals with a steel back layer thickness ≥ 2 mm and a copper alloy layer thickness ≥ 0.5 mm. The operation is simple, the influence of other external interference factors is minimized as much as possible, the test results have good repeatability, and the measured data is more accurate and reliable.

[0038] 2. The upper and lower templates are movably connected through the cooperation of guide posts and guide bushings. Under the action of the guide bushings, the upper template can maintain relative movement up and down with small frictional resistance and high movement accuracy.

[0039] 3. The screw is used to press the specimen clamping assembly through the third threaded hole provided on the rear end face of the positioning and fixing block, so that the front end face of the specimen clamping assembly is always firmly attached to the front end face of the positioning through hole of the positioning and fixing block without any shaking, ensuring that no eccentric load is generated when the tool is pressed down, thus not affecting the test results.

[0040] 4. The thickness of the specimen is higher than the depth of the clamping groove, which is convenient for clamping the specimen when the upper chuck and the lower chuck are tightened; the thickness of the boosting piece is less than the depth of the clamping groove of the lower chuck, so as to facilitate the movement of the boosting piece in the clamping groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a schematic structural diagram of the detection device in the embodiment of the present invention;

[0042] Figure 2 It is a schematic cross-sectional structural diagram of the detection device in the embodiment of the present invention;

[0043] Figure 3 It is a schematic structural diagram of the intermediate ball die carrier;

[0044] Figure 4 It is a schematic structural diagram of the specimen clamping assembly;

[0045] Figure 5Schematic cross-sectional structure diagram of the specimen clamping assembly;

[0046] Figure 6 Schematic structure diagram of the upper chuck;

[0047] Figure 7 Schematic structure diagram of the lower chuck;

[0048] Figure 8 Schematic diagram of the specimen;

[0049] Figure 9 Schematic diagram of the boosting piece;

[0050] Figure 10 Schematic structure diagram of the micrometer bracket;

[0051] Figure 11 Schematic structure diagram of the positioning and fixing block;

[0052] Figure 12 Schematic structure diagram of the tool fixing block;

[0053] Figure 13 Schematic structure diagram of the tool.

[0054] The reference numerals in the figure are:

[0055] 1. Intermediate ball die carrier; 11. Upper template; 111. Upper threaded hole; 12. Lower template; 121. First threaded hole; 13. Guide pillar and guide sleeve;

[0056] 2. Specimen clamping assembly; 21. Upper chuck; 211. Upper through hole; 212. Upper semi-circular groove; 22. Lower chuck; 221. Second threaded hole; 222. Clamping groove; 223. Lower semi-circular groove; 23. Micrometer; 24. Boosting piece; 25. Cage;

[0057] 3. Positioning and fixing block; 31. First countersunk hole; 32. Positioning through hole; 321. Front end face; 33. Third threaded hole;

[0058] 4. Tool fixing block; 41. Fixing hole; 42. Second countersunk hole;

[0059] 5. Tool; 51. Long end of the tool; 52. Upper end of the tool;

[0060] 6. Specimen; 61. Steel backing layer; 62. Copper alloy layer. Detailed implementation manners

[0061] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below in conjunction with specific embodiments.

[0062] As Figures 1-13As shown in the figure, a detection device for the bonding strength of a bimetallic sheet includes: an intermediate ball mold 1, a specimen clamping assembly 2, and a tool 5. The intermediate ball mold 1 includes an upper template 11 arranged horizontally and a lower template 12 located directly below the upper template 11. An active connecting piece is arranged between the upper template 11 and the lower template 12, and the two are movably connected through the active connecting piece. Moreover, the upper template 11 can move up and down relatively in the vertical direction. A positioning and fixing block 3 is arranged on the upper end surface of the lower template 12, and the specimen clamping assembly 2 is installed on the positioning and fixing block 3. The specimen clamping assembly 2 is used for clamping the specimen 6. A tool fixing block 4 is arranged on the lower end surface of the upper template 11, and the tool 5 is installed on the tool fixing block 4. The tool 5 is used for shearing the specimen 6.

[0063] Specifically, the active connecting piece includes a guide post vertically and fixedly arranged between the upper template 11 and the lower template 12, and a guide post bushing 13 vertically and fixedly arranged on the upper template 11. The upper template 11 is movably sleeved on the guide post through the guide post bushing 13. Two sets of active connecting pieces are arranged and are respectively located at both ends of the upper template 11. Its significance lies in that the upper template 11 can maintain a relatively up and down movement with small frictional resistance and high movement accuracy under the action of the guide post bushing 13.

[0064] As Figure 3 、 11 shown in the figure, a number of first threaded holes 121 are opened on the lower template 12, and a number of first counterbore holes 31 corresponding to and matching the first threaded holes 121 are opened on the positioning and fixing block 3. The positioning and fixing block 3 is fixedly installed on the upper end surface of the lower template 12 in a bolt connection manner through the cooperation of the first counterbore holes 31 and the first threaded holes 121.

[0065] A positioning through hole 32 penetrating through its thickness is opened on the positioning and fixing block 3, and the front end surface 321 of the positioning through hole 32 is on the same horizontal straight line as the guide posts of the two sets of active connecting pieces. A third threaded hole 33 communicating with the positioning through hole 32 is opened on the rear end surface of the positioning and fixing block 3.

[0066] The specimen clamping assembly 2 is integrally rectangular in structure. The specimen clamping assembly 2 is placed in the positioning through hole 32, and the specimen clamping assembly 2 is fixedly installed in the positioning through hole 32 in a pressing manner through the cooperation of the third threaded hole 33 and a screw. Its significance lies in that the specimen clamping assembly 2 is pressed by a screw through the third threaded hole 33 provided on the rear end surface of the positioning and fixing block 3, so that the front end surface of the specimen clamping assembly 2 is always firmly attached to the front end surface 321 of the positioning through hole 32 of the positioning and fixing block 3 without any shaking, ensuring that the position of the specimen clamping assembly 2 relative to the tool 5 remains unchanged, and ensuring that no eccentric load force is generated when the tool 5 presses down, thereby not affecting the test results.

[0067] AsFigures 4-10 As shown, the specimen clamping assembly 2 includes an upper chuck 21, a lower chuck 22 and a fine-tuning component. The upper chuck 21 is of an overall rectangular structure. A plurality of upper through-holes 211 are formed in the upper end surface of the upper chuck 21. A upper semi-circular groove 212 is provided on the lower end surface of the upper chuck 21, and the upper semi-circular groove 212 penetrates through the rear end surface of the upper chuck 21.

[0068] The lower chuck 22 is of an overall rectangular structure. A plurality of second threaded holes 221 corresponding to and matching the upper through-holes 211 are formed in the upper end surface of the lower chuck 22. The upper chuck 21 and the lower chuck 22 are fixedly connected by a bolt connection through the cooperation of the upper through-holes 211 and the second threaded holes 221.

[0069] A clamping groove 222 is provided on the upper end surface of the lower chuck 22. A lower semi-circular groove 223 is provided at the intersection of the rear end surface of the lower chuck 22 and the bottom of the clamping groove 222. When the upper chuck 21 and the lower chuck 22 are fixedly connected, the upper semi-circular groove 212 and the lower semi-circular groove 223 are coaxially arranged.

[0070] Two lower threaded holes are formed in the rear end surface of the lower chuck 22.

[0071] The fine-tuning component includes a booster piece 24, a cage 25 and a micrometer 23. The front surface of the cage 25 is of a product-shaped structure, and the side surface is of an L-shaped structure. Three connection through-holes are formed in the cage 25 and are in a product-shaped structure among the three connection through-holes. The two connection through-holes located below correspond to and match the two lower threaded holes formed in the rear end surface of the lower chuck 22 one by one. The cage 25 is fixedly installed on the lower chuck 22 by the cooperation of the two lower threaded holes and the connection through-holes in a bolt installation manner. The connection through-hole located above is used to fix the micrometer 23. When the cage 25 is installed on the lower chuck 22, the connection through-hole located above and the upper semi-circular groove 212 are coaxially arranged.

[0072] The booster piece 24 is a rectangular thin sheet structure. The booster piece 24 is arranged in the clamping groove 222 and is located behind the specimen 6. The specimen 6 is a bimetallic structure, and the sizes of the bonding surfaces of all specimens to be tested are unified, that is, the width and thickness are fixed. Taking the specimen 6 including a steel backing layer 61 and a copper alloy layer 62 as an example, place the specimen 6 in the clamping groove 222 of the lower chuck 22 with the copper alloy layer 62 facing outward. Adjust the micrometer 23 so that the protruding end of the micrometer 23 pushes the booster piece 24 forward until the surface of the copper alloy layer 62 of the specimen 6 is flush with the front end face of the lower chuck 22, and record the value of the micrometer 23 at this time. Then, according to the thickness B of the copper alloy layer, turn out the micrometer 23 by a length of B. At this time, the bonding surface between the copper alloy layer 62 and the steel backing layer 61 is exactly flush with the front end face of the lower chuck 22. Tighten the bolt to fasten the upper chuck 21 and the lower chuck 22 and clamp the specimen 6, and pay attention to ensuring that the front end face of the upper chuck 21 is flush with the front end face of the lower chuck 22. Thus, the specimen 6 is clamped.

[0073] Preferably, the telescopic accuracy of the micrometer 23 is 0.01 mm.

[0074] Preferably, the specimen 6 is placed in the clamping groove 222 of the lower chuck 22, and the thickness of the specimen 6 is higher than the depth of the clamping groove 222. The significance is that it is convenient to clamp the specimen 6 when the upper chuck 21 and the lower chuck 22 are fastened.

[0075] Preferably, the length of the booster piece 24 is adjusted accordingly according to the length of the specimen 6, and the thickness of the booster piece 24 is less than the depth of the clamping groove 222 of the lower chuck, so as to facilitate the movement of the booster piece 24 in the clamping groove 222.

[0076] Preferably, the diameter of the upper semi-circular groove 212 provided on the upper chuck 21 is larger than the diameter of the protruding rod of the micrometer 25, and the depth of the upper semi-circular groove 212 is greater than the maximum stroke of the protruding rod of the micrometer 25. The diameter of the lower semi-circular groove 223 provided on the lower chuck 22 is larger than the diameter of the protruding rod of the micrometer 25, and the depth of the lower semi-circular groove 223 is greater than the maximum stroke of the protruding rod of the micrometer 25.

[0077] As Figures 12-13 As shown, a plurality of upper threaded holes 111 are opened on the upper end face of the upper template 11. The tool fixing block 4 has a disc-shaped structure, and a plurality of second counterbore holes 42 corresponding to and matching the upper threaded holes 111 are opened on the tool fixing block 4. The tool fixing block 4 is fixedly installed on the lower end face of the upper template 11 by means of bolt connection through the cooperation of the second counterbore holes 42 and the upper threaded holes 111.

[0078] A stepped fixing hole 41 matching the tool 5 is opened at the middle position of the end face of the tool fixing block 4.

[0079] The described tool 5 has an overall T-shaped structure. The tool 5 includes a tool upper end 52 with a disc structure and a tool long end 51 with a round rod structure. The tool upper end 52 and the tool long end 51 are coaxially arranged, and the tool 5 is symmetrically flattened from the two circular axis directions to form two planes.

[0080] A method for detecting the bonding strength of a bimetallic sheet, the steps of which are as follows:

[0081] S1: Measure the thickness of the copper alloy layer of the sample to be tested, denoted as B;

[0082] S2: Make the sample to be tested into a specimen 6 of the standard specimen size;

[0083] S3: Place the specimen 6 in the clamping groove 222 of the lower chuck 22, with the copper alloy layer 62 facing outward. Adjust the micrometer 23 so that the protruding end of the micrometer 23 pushes the boosting piece 24 forward until the surface of the copper alloy layer 62 of the specimen 6 is flush with the front end face of the lower chuck 22, and record the value of the micrometer 23 at this time. Then, according to the thickness B of the copper alloy layer, screw out the micrometer 23 by a length of B. At this time, the bonding surface between the copper alloy layer 62 and the steel backing layer 61 is exactly flush with the front end face of the lower chuck 22. Tighten the bolt to fasten the upper chuck 21 and the lower chuck 22 and clamp the specimen 6;

[0084] S4: Fix and install the upper template 11 of the intermediate ball mold 1 at the lower pressing end of the precision pressure testing machine, and place the lower template 12 on the working platform of the precision pressure testing machine;

[0085] S5: Put the specimen clamping assembly 2 with the specimen 6 installed into the positioning through hole 32 of the positioning fixing block 3, and tighten the screw on the rear end face of the positioning fixing block 3 so that the front end face of the specimen clamping assembly 2 is always firmly attached to the front end face 321 of the positioning through hole 32 of the positioning fixing block 3;

[0086] S6: Adjust the plane of the tool 5 to be parallel to the front end faces of the upper and lower chucks and maintain a small gap. Tighten the tool fixing block 4 to clamp the tool 5;

[0087] S7: Start the precision pressure testing machine, press down the tool 5 to shear the specimen 6, read the maximum pressure F when the specimen 6 is cut off, and calculate the bonding strength P of the bimetallic sheet according to the bonding strength calculation formula: P = F / (L * H), where L in the formula represents the width of the standard specimen and H represents the thickness of the standard specimen;

[0088] S8: Repeat the test for 2 - 3 groups of specimens and find their average value. This average value is the bonding strength of the bimetallic sheet.

[0089] The embodiments described above merely represent the implementation modes of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A detection device for the bonding strength of a bimetallic sheet, characterized in that It includes: An intermediate ball die holder, a specimen clamping assembly, and a tool. The intermediate ball die holder includes an upper template and a lower template that are horizontally arranged. The upper template and the lower template are movably connected by a movable connecting member, and the upper template can move relatively up and down along the movable connecting member; On the upper end surface of the lower template, there is a positioning and fixing block for installing the specimen clamping assembly, and the specimen clamping assembly is used for clamping the specimen; the specimen clamping assembly includes an upper chuck, a lower chuck, and a fine-tuning component. On the lower end surface of the upper chuck, there is an upper semi-circular groove that penetrates to the rear end surface of the upper chuck; on the upper end surface of the lower chuck, there is a clamping groove, and at the intersection of the rear end surface of the lower chuck and the bottom of the clamping groove, there is a lower semi-circular groove. When the upper chuck and the lower chuck are fixedly connected, the upper semi-circular groove and the lower semi-circular groove are coaxially arranged; The fine-tuning component includes a boosting piece, a cage, and a micrometer. There are three connecting through holes in the cage, and the three connecting through holes are in a triangular structure. The connecting through hole located above is used to fix the micrometer, and when the cage is installed on the lower chuck, the connecting through hole located above and the upper semi-circular groove are coaxially arranged; the boosting piece is arranged in the clamping groove and behind the specimen. Adjust the micrometer so that the protruding end of the micrometer pushes the boosting piece forward until the surface of the copper alloy layer of the specimen is flush with the lower chuck, and record the value of the micrometer at this time; then, according to the thickness B of the copper alloy layer of the specimen, screw out the micrometer by B. At this time, the bonding surface between the copper alloy layer and the steel backing layer of the specimen is exactly flush with the lower chuck, and the upper chuck and the lower chuck are tightened to clamp the specimen; On the lower end surface of the upper template, there is a tool fixing block for installing the tool. Adjust the plane of the tool to be parallel to the front end surfaces of the upper and lower chucks, and press down the tool to shear the specimen.

2. The detection device for the bonding strength of a bimetallic sheet according to claim 1, characterized in that The movable connecting member includes a guide post vertically and fixedly arranged between the upper template and the lower template, and a guide bush for the guide post vertically and fixedly arranged on the upper template. The upper template is movably sleeved on the guide post through the guide bush for the guide post.

3. The detection device for the bonding strength of a bimetallic sheet according to claim 1, characterized in that On the lower template, there is a first threaded hole, and on the positioning and fixing block, there is a first countersunk hole corresponding to and matching the first threaded hole. The positioning and fixing block is fixedly installed on the upper end surface of the lower template by bolt connection through the cooperation of the first countersunk hole and the first threaded hole; On the positioning and fixing block, there is a positioning through hole for accommodating the specimen clamping assembly, and one hole wall of the positioning through hole is on the same horizontal straight line as the movable connecting member; On the side wall of the positioning and fixing block, there is a third threaded hole communicating with the positioning through hole. The specimen clamping assembly is fixedly installed in the positioning through hole by pressing through the cooperation of the third threaded hole and a screw; 4. The detection device for the bonding strength of a bimetallic sheet according to claim 3, characterized in that In the middle of the upper chuck, there is an upper through hole vertically opened; On the upper end surface of the lower chuck, there is a second threaded hole corresponding to and matching the upper through hole. The upper chuck and the lower chuck are fixedly connected by bolt connection through the cooperation of the upper through hole and the second threaded hole; On the side wall of the lower chuck, there are two lower threaded holes.

5. The detection device for the bonding strength of a bimetallic sheet according to claim 4, characterized in that The front surface of the cage is in a product-shaped structure. The two connecting through holes located below correspond to and match the two lower threaded holes provided on the lower chuck one by one. The cage is fixedly installed on the lower chuck in a bolt installation manner through the cooperation of the two lower threaded holes and the connecting through holes.

6. The detection device for the bonding strength of a bimetallic sheet according to claim 5, characterized in that The upper end surface of the upper template is provided with upper threaded holes. The tool fixing block is provided with second countersunk holes corresponding to and matching the upper threaded holes. The tool fixing block is fixedly installed on the lower end surface of the upper template in a bolt connection manner through the cooperation of the second countersunk holes and the upper threaded holes. A stepped fixing hole matching the tool is provided at the middle position of the end surface of the tool fixing block.

7. A detection method for the detection device of the bonding strength of a bimetallic sheet according to any one of claims 1-6, the steps are as follows: S1: Measure the thickness of the copper alloy layer of the sample to be measured, denoted as B; S2: Make the sample to be measured into a sample of the standard sample size; S3: Place the sample in the clamping groove of the lower chuck, with the copper alloy layer facing outwards. Adjust the micrometer so that the protruding end of the micrometer pushes the booster piece forward until the surface of the copper alloy layer of the sample is flush with the lower chuck, and record the value of the micrometer at this time. Then, according to the thickness B of the copper alloy layer, screw out the micrometer by a length of B. At this time, the bonding surface of the copper alloy layer and the steel backing layer is exactly flush with the lower chuck. Tighten the bolt to fasten the upper chuck and the lower chuck to clamp the sample; S4: Fix the upper template of the intermediate ball mold base on the lower pressing end of the precision pressure testing machine, and place the lower template on the working platform of the precision pressure testing machine; S5: Put the sample clamping assembly with the sample installed into the positioning through hole of the positioning fixing block, and tighten the screw on the positioning fixing block so that the sample clamping assembly is always firmly attached to the positioning through hole of the positioning fixing block; S6: Adjust the plane of the tool to be parallel to the front end faces of the upper and lower chucks, and maintain a small gap. Tighten the tool fixing block to clamp the tool. S7: Start the precision pressure testing machine to press down the tool, shear the specimen, and read the maximum pressure F when the specimen is sheared off. Calculate the bonding strength P of the bimetallic sheet according to the bonding strength calculation formula: P = F / (L * H), where L represents the width of the standard specimen and H represents the thickness of the standard specimen in the formula. S8: Repeat the test for 2 - 3 groups of specimens and find their average value, which is the bonding strength of the bimetallic sheet.

8. The detection method of the bimetallic sheet bonding strength detection device according to claim 7, characterized in that The telescopic accuracy of the micrometer is 0.01 mm. The specimen is placed in the clamping groove of the lower chuck, and the thickness of the specimen is higher than the depth of the clamping groove. The length of the boosting piece is adjusted accordingly according to the length of the specimen, and the thickness of the boosting piece is less than the depth of the clamping groove of the lower chuck.

9. The detection method of the bimetallic sheet bonding strength detection device according to claim 7, characterized in that The diameter of the upper semi-circular groove provided on the upper chuck is larger than the diameter of the protruding rod of the micrometer, and the depth of the upper semi-circular groove is greater than the maximum stroke of the protruding rod of the micrometer. The diameter of the lower semi-circular groove provided on the lower chuck is larger than the diameter of the protruding rod of the micrometer, and the depth of the lower semi-circular groove is greater than the maximum stroke of the protruding rod of the micrometer.

10. The detection method of the bimetallic sheet bonding strength detection device according to claim 7, characterized in that The tool includes a tool upper end and a tool long end. The tool upper end is in a disc structure, and the tool long end is in a round rod structure. The tool upper end and the tool long end are coaxially arranged, and the tool is symmetrically flattened from the direction of the two circular axes to form two planes.

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