A clamping force device for bonding HVOF or APS coating adhesion test specimens

Abstract

The utility model discloses a clamping force device for bonding HVOF or APS coating adhesion test specimens, wherein the upper end surface of the bottom plate of the device is provided with a plurality of U-shaped grooves arranged in parallel with the axis to place a plurality of groups of sample components; the bottom plate is fixedly connected to a top plate on one side of the end of the U-shaped groove, and is fixedly connected to a guide plate on the other side; a plurality of positioning tips located on the axis of each U-shaped groove are fixedly provided on the inner end surface of the top plate, and a combination hole located on the axis of each U-shaped groove is opened on the guide plate, and each combination hole is used to install a plurality of groups of clamping assemblies in a one-to-one correspondence, so as to provide clamping force to a group of sample assemblies placed on the U-shaped groove at the corresponding position through the movable tip at the end of each group of clamping assemblies, thereby clamping the tension joint in the sample assembly that is docked with the movable tip. The utility model solves the problems of coaxiality of coating adhesion test pieces and excessive or insufficient clamping force commonly existing in the existing coating adhesion strength test.

Description

Technical Field

[0001] The utility model relates to but is not limited to the field of experiment and test technology, in particular to a clamping force device for bonding a sample for testing the bonding force of an HVOF or APS coating. Background Art

[0002] High velocity oxygen fuel (HVOF) and plasma spraying (APS) are widely used in the surface treatment of aviation parts to form high bonding strength, dense and high-quality coatings. The coatings have the functions of anti-oxidation, anti-thermal shock, anti-wear, and anti-atmospheric corrosion.

[0003] Since there are specific strength requirements for coating adhesion in engineering, the coating adhesion strength needs to be tested after each batch of spraying; and in the existing coating adhesion strength test, there are usually problems with the coaxiality of the coating adhesion specimen and the problem of the clamping force being too large or too small. Utility Model Content

[0004] Purpose of the utility model: In order to solve the above-mentioned technical problems, the embodiment of the utility model provides a clamping force device for bonding HVOF or APS coating adhesion test specimens, so as to solve the coaxiality problem of the coating adhesion specimen and the problem of too large or too small clamping force that commonly exists in the HVOF or APS coating adhesion strength test.

[0005] Technical solution of the utility model: The embodiment of the utility model provides a clamping force device for bonding a HVOF or APS coating bonding test specimen, comprising: a bottom plate 1, a top plate 2, a positioning top 3, a specimen assembly 4, a movable top 5, a guide plate 6, and a plurality of clamping assemblies;

[0006] The upper end surface of the bottom plate 1 is provided with a plurality of U-shaped grooves arranged in parallel with the axis, for placing a plurality of groups of sample assemblies 4 in a one-to-one correspondence; and the plurality of U-shaped grooves and the plurality of groups of clamping assemblies are arranged symmetrically one by one;

[0007] The bottom plate 1 is fixedly connected to a top plate 2 on one side of the end of the U-shaped groove, and is fixedly connected to a guide plate 6 on the other side of the end of the U-shaped groove; a plurality of positioning tips 3 located on the axis of each U-shaped groove are fixedly provided on the inner end surface of the top plate 2, and a combination hole located on the axis of each U-shaped groove is opened on the guide plate 6, and each combination hole is used for installing multiple groups of clamping assemblies in a one-to-one correspondence, so as to provide clamping force to a group of sample assemblies placed on the U-shaped groove at the corresponding position through the movable tip 5 at the end of each group of clamping assemblies, thereby clamping the tension joint in the sample assembly that is connected to the movable tip 5.

[0008] Optionally, in the clamping force device for bonding the HVOF or APS coating adhesion test specimen as described above, each set of clamping components includes: a movable top 5, a spring 7, a screw plug 8 and a handle screw 9;

[0009] The combination hole on the guide plate 6 includes an inner light hole and an outer threaded hole that are connected; the movable tip 5 is configured as a sleeve structure with an opening on one side and a tip on the other side, and a threaded hole is provided on the inner wall of the sleeve bottom end of the movable tip 5. The movable tip 5 is nested in the inner light hole of the combination hole in the guide plate 6, and its tip is located on the inner side of the guide plate 6 and is used to cooperate with the tension joint;

[0010] The handle screw 9 includes a screw rod and a handle, a spring 7 is sleeved on the screw rod, and the end of the screw rod is inserted into the sleeve of the movable top 5 and is screwed and fixed with the threaded hole on the inner wall of the movable top 5. The screw plug 8 is sleeved on the screw rod of the handle screw 9 and is screwed and fixed with the outer threaded hole of the combination hole in the guide plate 6, so that the spring 7 is located between the inner end face of the screw plug 8 and the inner wall of the sleeve of the movable top 5.

[0011] Optionally, in the clamping force device for bonding the HVOF or APS coating adhesion test specimen as described above,

[0012] In each sample assembly, two end surfaces of a pair of tension joints arranged in pairs are respectively provided with center holes for respectively cooperating with the positioning top 3 and the movable top 5.

[0013] Optionally, in the clamping force device for bonding the HVOF or APS coating adhesion test specimen as described above,

[0014] The U-shaped groove on the bottom plate 1 is formed by high-precision machining, so that the axis of each U-shaped groove is parallel, and the positioning tips 3 and clamping components correspondingly arranged at both ends of each U-shaped groove are coaxially arranged with the U-shaped groove.

[0015] Optionally, in the clamping force device for bonding the HVOF or APS coating adhesion test specimen as described above,

[0016] The sample assembly 4 includes a set of blank sample assemblies and a plurality of coating sample assemblies;

[0017] Wherein, the blank sample assembly comprises a pair of tension joints and a film arranged in pairs, wherein the film is arranged between the two tension joints to bond the two tension joints into a blank sample assembly of an integral structure;

[0018] Each set of coating sample components includes: a pair of tension joints and films arranged in pairs, as well as a coating test piece and a test piece. The two end surfaces of the coating test piece are respectively bonded to the tension joints located on the same side through films to form a coating sample component with an integral structure.

[0019] Optionally, in the clamping force device for bonding the HVOF or APS coating adhesion test specimen as described above,

[0020] In each specimen assembly 4, a pair of tension joints arranged in pairs respectively include a columnar bonding portion and a square positioning portion, and each tension joint is arranged as a whole to have a structure with symmetrical surfaces; after the test piece and the film are bonded by the pair of tension joints arranged in pairs, or after the test piece is bonded by the pair of tension joints arranged in pairs, the symmetrical surfaces of the pair of tension joints arranged in pairs are located in the same plane.

[0021] Optionally, the clamping force device for bonding the HVOF or APS coating adhesion test specimen as described above further includes: a screw 10, a pin 11 and a handle 12;

[0022] The guide plate 6, the bottom plate 1 and the top plate 2 are connected to form an overall frame structure of the device by passing a plurality of pins 11 through the through holes at corresponding positions, so as to ensure the coaxiality of the positioning top 3, the movable top 5 and the U-shaped groove;

[0023] The guide plate 6 is fastened to the bottom plate 1 by a plurality of screws 10 , and the top plate 2 is fastened to the bottom plate 1 by a plurality of screws 10 .

[0024] Beneficial effects of the utility model: The embodiment of the utility model provides a clamping force device for bonding HVOF or APS coating adhesion test samples, by arranging a plurality of U-shaped grooves parallel to the axis on the upper end surface of the bottom plate 1 to ensure the coaxiality of the positioning top 3, the movable top 5 and the U-shaped groove, thereby ensuring the coaxiality of the sample assembly; through the structure of multiple groups of clamping assemblies, as well as the installation and use of the guide plate 6, it can be ensured that a suitable clamping force is provided to the sample assembly, and because the spring 7 is not compressed when the sample assembly is clamped, it can be ensured that after the film is placed in a heating furnace to dissolve, the bonding part will not collapse.

[0025] After the test piece is subjected to supersonic flame spraying or plasma spraying, it is necessary to test whether the bonding force between the coating and the substrate meets the technical requirements; the test process is to place the coating test piece between a pair of special tooling (i.e., a pair of tension joints set in pairs), and place a piece of FM1000 solid film between the coating test piece and the end face of the tooling, and apply a certain clamping force while maintaining the overall coaxiality of the coating test piece and the tooling, and then put it into a temperature box, heat it according to certain temperature parameters, and then cool it, and then test it. If the clamping force device provided by the embodiment of the utility model is not used, firstly, the coaxiality cannot be guaranteed, resulting in erroneous test results; secondly, if a certain clamping force is not applied, the test piece is not firmly pasted, and during heat treatment, it overflows due to the melting of the solid glue. Therefore, the clamping force device provided in the embodiment of the utility model is the most critical device when testing the bonding force of supersonic flame spraying or plasma spraying, and the clamping force device provided by the utility model has the characteristics of low cost, simple operation and strong practicality, and can well meet the testing needs of the bonding force of supersonic flame spraying or plasma spraying; when ensuring the bonding force test of supersonic flame spraying (HVOF) and plasma spraying (APS), it can not only ensure the coaxiality of the sample, but also provide a suitable clamping force to the bonding sample assembly, ensuring that the sample assembly is firmly bonded after heating.

[0026] In addition, the device provided by the utility model has low manufacturing cost, reasonable structure, convenient operation, and can meet the bonding test of supersonic flame spraying and plasma spraying. Furthermore, the device provided by the utility model is a block design, and if a part is broken, it can be easily disassembled and replaced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a clamping force device for bonding a HVOF or APS coating bonding test specimen provided by an embodiment of the utility model;

[0029] Figure 2 for Figure 1 The overall structural diagram of the clamping force device for bonding the HVOF or APS coating bonding test specimens provided in the illustrated embodiment;

[0030] Figure 3 for Figure 2 A top view of a clamping force device for bonding a HVOF or APS coating adhesion test specimen according to the illustrated embodiment;

[0031] Figure 4 for Figure 2 A cross-sectional view of a clamping force device for bonding a HVOF or APS coating adhesion test specimen according to the illustrated embodiment;

[0032] Figure 5 for Figure 2 A front view of a clamping force device for bonding HVOF or APS coating adhesion test specimens according to the illustrated embodiment.

[0033] Reference numerals:

[0034] Bottom plate-1, top plate-2, positioning center-3, specimen-4, movable center-5, guide plate-6, spring-7, screw plug-8, handle screw-9, screw-10, pin-11, handle-12. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the embodiments of the utility model will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other arbitrarily without conflict.

[0036] The above background technology has explained the application and important role of high velocity oxygen fuel spraying (HVOF) and plasma spraying (APS), and the specific strength test requirements for coating adhesion strength in engineering applications.

[0037] At present, the method of testing the bonding strength of coatings is usually to simply put the coating test piece, film and tensile joint together, place them vertically in the furnace, and use their own gravity to apply a certain clamping force to make the sample bonded; the above bonding method is often used in some plasma spraying with low bonding strength requirements, but the disadvantages are also obvious. On the one hand, the furnace is not flat, and the above vertical placement method may tilt. After the film melts, the effective bonding area is reduced, resulting in low strength; in addition, after the tilt occurs, the coaxiality between the coating test piece and the tensile joint cannot be well guaranteed, and a certain torque is generated, which may also lead to low bonding strength or even unqualified. On the other hand, since the above-mentioned clamping force relies only on the gravity of the coating test piece and the tension joint themselves, the magnitude of the gravity cannot be adjusted, and the gravity may often be too large or too small; if the gravity is too large, the glue liquid will be squeezed out after the film melts, resulting in insufficient glue, reduced bonding strength, or even failure to meet the standards; if the gravity is too small and the clamping force is insufficient, bubbles will be generated during the expansion of the film after melting and the cooling and contraction, resulting in loose bonding, which will also lead to reduced strength or test failure.

[0038] In addition, some companies, when doing bonding strength tests, although they have made simple clamping force devices, still have coaxiality problems and the problem of clamping force being too large or too small, resulting in low strength or even unqualified test results, which seriously affects the precision and accuracy of the test results.

[0039] In view of the above-mentioned problems existing in the existing bonding strength test, an embodiment of the utility model provides a clamping force device for bonding HVOF or APS coating bonding strength test specimens, which can be applicable to the bonding strength test of supersonic flame spraying (HVOF) and plasma spraying (APS) coatings involved in various models.

[0040] The utility model provides the following specific embodiments which can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0041] The designers of the utility model have taken into consideration the need to use a special clamping force device to test the bonding strength of the coating, especially for supersonic flame spraying (HVOF). Since the coating is generally required to withstand a tensile strength of more than 70 MPa, a reasonable clamping force device is designed and a high-precision machined U-shaped groove is used to ensure that the bonding sample has good coaxiality. In addition, the clamping assembly and the positioning top can provide appropriate clamping force to ensure that the film is perfectly bonded to the test piece and the tensile connector after being heated and dissolved in the furnace, thereby improving the test pass rate.

[0042] Figure 1 A schematic diagram of the three-dimensional structure of a clamping force device for bonding a HVOF or APS coating bonding test sample provided by an embodiment of the utility model, Figure 2 for Figure 1 The overall structural diagram of the clamping force device for bonding the HVOF or APS coating bonding test sample provided in the embodiment shown, Figure 3 for Figure 2 A top view of a clamping force device for bonding a HVOF or APS coating adhesion test specimen according to the embodiment shown, Figure 4 for Figure 2 A cross-sectional view of a clamping force device for bonding a HVOF or APS coating adhesion test specimen according to the embodiment shown, Figure 5 for Figure 2 A front view of a clamping force device for bonding HVOF or APS coating adhesion test specimens according to the illustrated embodiment.

[0043] Combination Figures 1 to 5 As shown, the composition structure of the clamping force device for bonding HVOF or APS coating adhesion test specimens provided by the embodiment of the utility model may include: a bottom plate 1, a top plate 2, a positioning center 3, a specimen assembly 4, a guide plate 6, and a plurality of clamping assemblies.

[0044] like Figures 1 to 5 In the structure of the clamping force device shown, the upper end surface of the bottom plate 1 is provided with a plurality of U-shaped grooves arranged in parallel with the axis, for placing a plurality of groups of sample assemblies 4 in a one-to-one correspondence; and the plurality of U-shaped grooves and the plurality of groups of clamping assemblies are arranged symmetrically one by one.

[0045] In the embodiment of the utility model, the bottom plate 1 is fixedly connected to a top plate 2 on one side of the end of the U-shaped groove, and the bottom plate 1 is fixedly connected to a guide plate 6 on the other side of the end of the U-shaped groove; a plurality of positioning tips 3 located on the axis of each U-shaped groove are fixedly provided on the inner end surface of the top plate 2, and a combination hole located on the axis of each U-shaped groove is opened on the guide plate 6, and each combination hole is used for installing multiple groups of clamping assemblies in a one-to-one correspondence, so as to provide clamping force to a group of sample assemblies placed on the U-shaped groove at the corresponding position through each group of clamping assemblies, thereby clamping the tension joint in the sample assembly that is connected to the movable tip 5.

[0046] By using the clamping force device provided in the embodiment of the utility model, the bonded sample assembly 4 can be placed as a whole in the U-shaped groove of the bottom plate 1 in the clamping force device, and the coaxiality of the sample assembly 4 can be adjusted based on the U-shaped groove, and the handle bolt 9 with a spring 7 can be screwed in and tightened until the sample assembly is clamped.

[0047] It should be noted that the U-shaped groove on the base plate 1 in the embodiment of the utility model is formed by high-precision machining, so that the axis of each U-shaped groove is parallel, and the positioning center 3 and the clamping assembly correspondingly arranged at both ends of each U-shaped groove are coaxially arranged with the U-shaped groove.

[0048] In one implementation of the present invention, the multiple sample assemblies 4 include a blank sample assembly and multiple coating sample assemblies; wherein a blank sample assembly is placed in one U-shaped groove, and coating sample assemblies are placed in other U-shaped grooves. In a specific implementation, the bottom plate 1 is usually provided with at least 4 U-shaped grooves, that is, at least 3 sample assemblies 4 can be placed at a time. Figures 1 to 5 As shown, a case where 7 U-shaped grooves and 7 sets of clamping assemblies are provided is taken as an example.

[0049] In this implementation, the blank sample assembly includes a pair of tension joints and a film that are arranged in pairs, and the film is arranged between the two tension joints to bond the two tension joints into a blank sample assembly with an integral structure.

[0050] Each set of coating sample components includes: a pair of tension joints and films, as well as a coating test piece and a test piece. The two end surfaces of the coating test piece are bonded to the tension joints on the same side through films to form a coating sample component with an integral structure.

[0051] In this implementation, one set of blank sample components can be used to test the effectiveness of the film, and at least three coating sample components can be tested at one time, which can avoid accidents during the test.

[0052] In the specific implementation of the embodiment of the utility model, in each sample assembly 4, a pair of tension joints arranged in pairs respectively include a columnar bonding portion and a square positioning portion, and each tension joint is arranged as a whole to have a structure with symmetrical surfaces; after the test piece and the film are bonded by the pair of tension joints arranged in pairs, or after the test piece is bonded by the pair of tension joints arranged in pairs, the symmetrical surfaces of the pair of tension joints arranged in pairs are located in the same plane.

[0053] In addition, in each sample assembly, the two end faces of a pair of tension joints arranged in pairs are respectively provided with center holes for respectively cooperating with the positioning top 3 and the movable top 5.

[0054] In one implementation of the present utility model, Figures 2 to 5 As shown, each set of clamping components includes: a movable top 5, a spring 7, a screw plug 8 and a handle screw 9. In this implementation, the combination hole opened on the guide plate 6 includes an inner light hole and an outer threaded hole that are connected; the movable top 5 is set as a sleeve structure with an opening on one side and a top on the other side, and a threaded hole is opened on the inner wall of the sleeve bottom of the movable top 5. The movable top 5 is nested in the inner light hole of the combination hole in the guide plate 6, and its top is located on the inner side of the guide plate 6, which is used to cooperate with the tension joint.

[0055] In this implementation, the handle screw 9 includes a screw rod and a handle, a spring 7 is sleeved on the screw rod, and the screw rod is inserted into the sleeve of the movable top 5 with its end, and is screwed and fixed with the threaded hole on the inner wall of the movable top 5. The screw plug 8 is sleeved on the screw rod of the handle screw 9, and is screwed and fixed with the outer threaded hole of the combination hole in the guide plate 6, so that the spring 7 is located between the inner end surface of the screw plug 8 and the inner wall of the sleeve of the movable top 5. The movable top 5 is pushed by screwing in the handle screw 9, thereby providing a certain clamping force to the sample assembly 4, clamping the tension joint where the sample assembly and the movable top 5 are connected. At this time, the spring 7 is not compressed, which can ensure that the bonding part will not collapse after the film is dissolved in the heating furnace.

[0056] Furthermore, if Figures 1 to 5 As shown, the clamping force device provided by the embodiment of the utility model is characterized in that it also includes: a screw 10, a pin 11 and a handle 12.

[0057] In the specific installation, the guide plate 6, the bottom plate 1 and the top plate 2 are connected to form the overall frame structure of the device by passing through the through holes at the corresponding positions with multiple pins 11 to ensure the coaxiality of the positioning top 3, the movable top 5 and the U-shaped groove. In addition, the guide plate 6 and the bottom plate 1 are fastened by multiple screws 10, and the top plate 2 and the bottom plate 1 are fastened by multiple screws 10.

[0058] The working mode of the clamping force device for bonding the HVOF or APS coating bonding test sample provided by the embodiment of the utility model is as follows:

[0059] (1) Pretreatment stage, forming a sample assembly 4;

[0060] Place a pair of tension joints in a standard V-groove, place a coated test piece between the two tension joints, and then place a piece of FM1000 film between the end faces of the two tension joints and the coated test piece. After adjusting the positions of the tension joints, the coated test piece and the film, fit them tightly together, then wrap a circle of high-temperature resistant tape around the outer circle of the pair of tension joints sandwiching the coated test piece and the film to bond the sample assembly.

[0061] The above is an implementation method for forming a coating sample assembly. For a blank sample assembly, a piece of FM1000 film is placed between the end faces of two tension joints. After adjusting the position, they are tightly fitted together and then bonded in the same way to form a sample assembly.

[0062] (2) Place the bonded sample assembly in the clamping force device

[0063] The bonded sample assembly is placed in the U-shaped groove of the base plate 1. Since the design and processing accuracy of the U-shaped groove on the base plate 1 is very high (the U-shaped groove is formed by high-precision machining), the coaxiality of the sample assembly 4 can be well guaranteed.

[0064] After the sample assembly 4 is placed axially along the U-shaped groove, center holes are opened on both end faces of the tension joint of the sample assembly 4, and a positioning top 3 is fixedly provided on the inner end face of the top plate 2 of the clamping force device, and a clamping assembly with a movable end face is provided on the guide plate 7, and its inner end face has a movable top 5 which corresponds to the positioning top 3 and is coaxially arranged. A pair of coaxial tops are inserted into the center holes of a pair of tension joints to further ensure the coaxiality of the sample assembly docking tooling.

[0065] In addition, since a compression spring 7 is installed on the screw rod of the handle screw 9 at the other end of the movable top 5, the handle is rotated from the outside to screw in the handle screw 9, and the thread at the end of the handle screw 9 is screwed into the internal screw hole of the movable top 5, the screw plug 8 is mounted on the handle screw 9 and screwed and fixed with the outer threaded hole of the combination hole on the guide plate 6, so that the compression spring 7 is located between the inner end surface of the screw plug 8 and the inner wall of the sleeve of the movable top 5, and the movable top 5 is pushed by screwing in the handle screw 9, thereby providing a certain clamping force to the sample assembly 4, clamping the tension joint where the sample assembly and the movable top 5 are connected. At this time, the spring 7 is not compressed, which can ensure that the bonding part will not collapse after the film is dissolved in the heating furnace.

[0066] The clamping force device for bonding HVOF or APS coating adhesion test samples provided by the embodiment of the utility model is provided with a plurality of U-shaped grooves arranged parallel to the axis on the upper end surface of the bottom plate 1 to ensure the coaxiality of the positioning top 3, the movable top 5 and the U-shaped groove, thereby ensuring the coaxiality of the sample assembly; through the structure of multiple groups of clamping assemblies, as well as the installation and use of the guide plate 6, it is possible to ensure that a suitable clamping force is provided to the sample assembly, and because the spring 7 is not compressed when the sample assembly is clamped, it is possible to ensure that the bonding portion does not collapse after the film is placed in a heating furnace to dissolve.

[0067] After the test piece is subjected to supersonic flame spraying or plasma spraying, it is necessary to test whether the bonding force between the coating and the substrate meets the technical requirements; the test process is to place the coating test piece between a pair of special tooling (i.e., a pair of tension joints set in pairs), and place a piece of FM1000 solid film between the coating test piece and the end face of the tooling, and apply a certain clamping force while maintaining the overall coaxiality of the coating test piece and the tooling, and then put it into a temperature box, heat it according to certain temperature parameters, and then cool it, and then test it. If the clamping force device provided by the embodiment of the utility model is not used, firstly, the coaxiality cannot be guaranteed, resulting in erroneous test results; secondly, if a certain clamping force is not applied, the test piece is not firmly pasted, and during heat treatment, it overflows due to the melting of the solid glue. Therefore, the clamping force device provided in the embodiment of the utility model is the most critical device when testing the bonding force of supersonic flame spraying or plasma spraying, and the clamping force device provided by the utility model has the characteristics of low cost, simple operation and strong practicality, and can well meet the testing needs of the bonding force of supersonic flame spraying or plasma spraying; when ensuring the bonding force test of supersonic flame spraying (HVOF) and plasma spraying (APS), it can not only ensure the coaxiality of the sample, but also provide a suitable clamping force to the bonding sample assembly to ensure that the sample assembly is firmly bonded after heating. In addition, the device provided by the utility model has low manufacturing cost, reasonable structure, and convenient operation, which can meet the bonding force test of supersonic flame spraying and plasma spraying. Furthermore, the device provided by the utility model is a block design, and if it is broken somewhere, it can be easily disassembled and replaced.

[0068] Therefore, the clamping force device for bonding HVOF or APS coating adhesion test specimens provided by the embodiment of the utility model effectively solves the coaxiality problem of the supersonic flame spraying (HVOF) or plasma spraying (APS) adhesion test specimens, and provides appropriate clamping force when the test specimen, film and tension joint are heated and dissolved to ensure that the specimen is firmly bonded and the adhesion meets the test requirements.

[0069] The following is a schematic illustration of the implementation of the clamping force device for bonding HVOF or APS coating adhesion test specimens provided by the embodiment of the utility model through a specific implementation example.

[0070] Implementation Example

[0071] Reference Figures 1 to 5 As shown, the composition structure of the clamping force device for bonding the HVOF or APS coating bonding test specimen provided by this implementation example is shown in the following table:

[0072]

[0073]

[0074] (1) The principle of the above clamping force device is:

[0075] The clamping force device provided in this embodiment is composed of a guide plate 6, a fixing plate 2 and a bottom plate 1. The upper end surface of the bottom plate 1 is machined to form a plurality of U-shaped grooves arranged in parallel. The whole of the bonded sample assembly 4 is placed in the U-shaped groove of the bottom plate 1 of the clamping force device, the coaxiality is adjusted, and the handle bolt 9 with a spring 7 is screwed in and tightened until the sample assembly 4 is tightened. Figure 1 and Figure 2 shown.

[0076] (2) The installation method of the above clamping force device is:

[0077] Four pins 11 are used to connect the guide plate 6, the bottom plate 2 and the top plate 2 to form an overall frame structure. The four pins play a positioning role to ensure the coaxiality of the movable top plate 5, the U-shaped groove of the bottom plate 1 and the positioning top plate 3. Then, six screws 10 are used to fasten the guide plate 6 and the bottom plate 1, and six screws are used to fasten the top plate 2 and the bottom plate 1.

[0078] The 7 positioning tips 3 are installed on the mounting holes of the top plate 2 and are fixed when the sample assembly 4 is clamped. The 7 movable tips 5 are installed in the 7 combined mounting holes on the guide plate 6, and the movable tips 5 face the positioning tips 3. The outer threaded holes of the 7 combined mounting holes on the guide plate 6 are screwed with screw plugs 8, and a spring 7 is arranged between the screw plugs 8 and the sleeves of the movable tips 5 to adjust the force. The specific action form is: when the film is melted in the furnace, it expands, and the sample expands axially, squeezing the movable tips 5 and then providing compression force to the spring 7, which reduces the additional clamping force caused by the expansion by compressing the spring 7, so as to avoid excessive clamping force squeezing the glue liquid to overflow and reduce the bonding strength.

[0079] Then insert the handle screw 9 with a thread at one end into the screw plug hole, pass through the spring 7, and then screw into the internal thread hole at one end of the movable top 5. After the bonded sample assembly 4 is placed into the U-shaped groove of the bottom plate 1, let the tension joints on both sides of the sample assembly 4 be fixed on the positioning top 3 at one end of the center hole, and then push the movable top 5 to move toward the positioning top 3 by screwing in the handle of the handle screw 9 until the tip of the movable top 5 is inserted into the center hole at the other end of the tension joint. Then continue to twist the handle until the bonded sample assembly 4 is just fixed.

[0080] (3) Effect of clamping force device

[0081] In order to verify the effect of the clamping force device, several groups of tests were carried out and the test results met the standard requirements.

[0082] The beneficial effects of this implementation example are:

[0083] 1) The device provided by the utility model has low manufacturing cost, reasonable structure, and convenient operation, and can meet the bonding strength test of supersonic flame spraying and plasma spraying.

[0084] 2) The device provided by the utility model is of block design, and if a part is broken, it can be easily disassembled and replaced.

[0085] Although the implementation methods disclosed in the utility model are as above, the content is only an implementation method adopted to facilitate the understanding of the utility model, and is not used to limit the utility model. Any technician in the field to which the utility model belongs can make any modifications and changes in the form and details of implementation without departing from the spirit and scope disclosed in the utility model, but the scope of patent protection of the utility model shall still be based on the scope defined in the attached claims.

Claims

1. A clamping force device for bonding HVOF or APS coating adhesion test specimens, characterized in that: include: A bottom plate (1), a top plate (2), a positioning top (3), a sample assembly (4), a movable top (5), a guide plate (6), and a plurality of clamping assemblies; The upper end surface of the bottom plate (1) is provided with a plurality of U-shaped grooves arranged with axes parallel to each other, for placing a plurality of groups of sample assemblies (4) in a one-to-one correspondence; and the plurality of U-shaped grooves and the plurality of groups of clamping assemblies are arranged symmetrically one-to-one; The bottom plate (1) is fixedly connected to a top plate (2) on one side of the end of the U-shaped groove, and is fixedly connected to a guide plate (6) on the other side of the end of the U-shaped groove; a plurality of positioning tips (3) located on the axis of each U-shaped groove are fixedly arranged on the inner end surface of the top plate (2), and a combination hole located on the axis of each U-shaped groove is opened on the guide plate (6), and each combination hole is used to install a plurality of groups of clamping assemblies in a one-to-one correspondence, so that a clamping force is provided to a group of sample assemblies placed on the U-shaped groove at a corresponding position through the movable tips (5) at the end of each group of clamping assemblies, thereby clamping the tension joint in the sample assembly that is connected to the movable tips (5).

2. The clamping force device for bonding HVOF or APS coating adhesion test specimens according to claim 1, characterized in that: Each set of clamping components includes: a movable top (5), a spring (7), a screw plug (8) and a handle screw (9); The combination hole on the guide plate (6) comprises an inner light hole and an outer threaded hole which are connected to each other; the movable tip (5) is configured as a sleeve structure with an opening on one side and a tip on the other side, and a threaded hole is provided on the inner wall of the sleeve bottom end of the movable tip (5); the movable tip (5) is nested in the inner light hole of the combination hole in the guide plate (6), and its tip is located on the inner side of the guide plate (6) and is used to cooperate with the tension joint; The handle screw (9) comprises a screw rod and a handle, a spring (7) is sleeved on the screw rod, and the end of the screw rod is inserted into the sleeve of the movable top (5) and is screwed and fixed with the threaded hole on the inner wall of the movable top (5). The screw plug (8) is sleeved on the screw rod of the handle screw (9) and is screwed and fixed with the outer threaded hole of the combination hole in the guide plate (6), so that the spring (7) is located between the inner end surface of the screw plug (8) and the inner wall of the sleeve of the movable top (5).

3. The clamping force device for bonding HVOF or APS coating adhesion test specimens according to claim 2, characterized in that: In each sample assembly, two end surfaces of a pair of tension joints arranged in pairs are respectively provided with center holes for respectively cooperating with the positioning top (3) and the movable top (5).

4. The clamping force device for bonding HVOF or APS coating adhesion test specimens according to claim 1, characterized in that: The U-shaped groove on the bottom plate (1) is formed by high-precision machining, so that the axis of each U-shaped groove is parallel, and the positioning top (3) and the clamping assembly correspondingly arranged at both ends of each U-shaped groove are coaxially arranged with the U-shaped groove.

5. The clamping force device for bonding HVOF or APS coating adhesion test specimens according to any one of claims 1 to 4, characterized in that: The sample assembly (4) includes a set of blank sample assemblies and a plurality of coating sample assemblies; Wherein, the blank sample assembly comprises a pair of tension joints and a film arranged in pairs, wherein the film is arranged between the two tension joints to bond the two tension joints into a blank sample assembly of an integral structure; Each set of coating sample components includes: a pair of tension joints and films arranged in pairs, as well as a coating test piece and a test piece. The two end surfaces of the coating test piece are respectively bonded to the tension joints located on the same side through films to form a coating sample component with an integral structure.

6. The clamping force device for bonding HVOF or APS coating adhesion test specimens according to claim 5, characterized in that: In each sample assembly (4), a pair of tension joints arranged in pairs respectively include a columnar bonding portion and a square positioning portion, and each tension joint is arranged as a whole to have a structure with symmetrical surfaces; after the test piece and the film are bonded by the pair of tension joints arranged in pairs, or after the test piece is bonded by the pair of tension joints arranged in pairs, the symmetrical surfaces of the pair of tension joints arranged in pairs are located in the same plane.

7. The clamping force device for bonding HVOF or APS coating adhesion test specimens according to any one of claims 1 to 4, characterized in that: Also includes: Screw (10), pin (11) and handle (12); The guide plate (6), the bottom plate (1) and the top plate (2) are connected to form an overall frame structure of the device by passing a plurality of pins (11) through through holes at corresponding positions, so as to ensure the coaxiality of the positioning center (3), the movable center (5) and the U-shaped groove; The guide plate (6) and the bottom plate (1) are fastened together by a plurality of screws (10), and the top plate (2) and the bottom plate (1) are fastened together by a plurality of screws (10).

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