CN114486506A - Clamp for testing bonding strength of coating - Google Patents
Clamp for testing bonding strength of coating Download PDFInfo
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- CN114486506A CN114486506A CN202210099977.8A CN202210099977A CN114486506A CN 114486506 A CN114486506 A CN 114486506A CN 202210099977 A CN202210099977 A CN 202210099977A CN 114486506 A CN114486506 A CN 114486506A
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- 238000000576 coating method Methods 0.000 title claims abstract description 86
- 239000011248 coating agent Substances 0.000 title claims abstract description 82
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 230000009977 dual effect Effects 0.000 claims abstract description 40
- 239000011324 bead Substances 0.000 claims abstract description 36
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 230000007704 transition Effects 0.000 claims description 27
- 238000009864 tensile test Methods 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 description 15
- 239000000758 substrate Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
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- 230000036544 posture Effects 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 2
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- 238000010168 coupling process Methods 0.000 description 2
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- 241000251468 Actinopterygii Species 0.000 description 1
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- 238000012512 characterization method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0405—Features allowing alignment between specimen and chucks
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a test of coating bonding strength is with anchor clamps, it includes two dual anchor clamps units, each dual anchor clamps unit includes anchor clamps pull rod, fisheye universal joint, pin and connection pull rod; the clamp pull rod comprises a tension section and a mounting section, the mounting section comprises two flat plate parts, the two flat plate parts are spaced from each other, cylindrical holes penetrating through the flat plate parts along the thickness direction are formed in the flat plate parts, and the cylindrical holes of the two flat plate parts are aligned with each other; the fisheye universal joint comprises a fisheye bearing section and a stud section, the fisheye bearing section comprises a fisheye bead, a limiting frame and an outer frame, the fisheye bead is a cylindrical through hole with a through hole, and the stud section is provided with an external thread; the pin is used for passing through the through hole of the fisheye bead and the cylindrical holes of the two flat plate parts; the connecting pull rod comprises a first connecting section and a second connecting section, the first connecting section is provided with an internal thread, the internal thread is used for being matched with the external thread of the stud section, and the second connecting section is used for being fixedly connected to a sample to be tested in a bonding mode. Thereby, transverse shear forces parallel to the coating direction can be eliminated.
Description
Technical Field
The disclosure relates to the field of coatings, in particular to a clamp for testing the bonding strength of a coating.
Background
The high bond strength between the coating and the substrate surface is critical to its function of protecting the substrate, which is directly related to the durability and integrity of the coating, with the most immediate consequence of insufficient bond strength being coating bulging, cracking, and even spalling. Good bond strength is a prerequisite for the coating to perform its function and perform its service.
Common characterization methods of the bonding strength of the coating include a stretching method, an indentation method and an improved toughness experiment method. Although the tensile method for measuring the bonding strength of the coating material has the defects of excessively high estimated bonding strength due to the use of a binder, uncontrollable failure positions of the coating and the like, the method has simple test principle and convenient operation, and becomes the most common method for evaluating the bonding strength of the coating.
The method for measuring the bonding strength of the coating material by using a tensile method comprises the steps of fixing a sample with a coating on a designed bonding strength test fixture, pulling the fixture and the sample apart at a certain tensile rate by using a universal mechanical testing machine, recording the load and displacement in the tensile process, and calculating to obtain the bonding strength value of the coating material, wherein the bonding strength value is the maximum load value divided by the area of the applied load (P is F/S, wherein the P unit is MPa, the F unit is N, and the S unit is m2). However, this method requires that the coating and the substrate are subjected only to tensile forces applied by a tensile tester, and no shear forces are applied parallel to the direction of the coating. If the clamp is inclined when being loaded or the test sample to be tested and the dual clamp are not concentrically fixed when being fixed, a transverse shearing force is generated in the horizontal direction of the coating, so that the measurement result is seriously influenced, and even the test data fails.
Disclosure of Invention
In view of the problems in the background art, an object of the present disclosure is to provide a clamp for testing coating bonding strength, which can eliminate the transverse shear force parallel to the coating direction, thereby ensuring the consistency, repeatability, reliability and accuracy of the result of the coating strength tensile test.
Therefore, in some embodiments, the clamp for the coating bonding strength test comprises two dual clamp units, wherein the two dual clamp units are respectively used for being fixedly connected with two opposite surfaces of a sample to be tested, provided with a coating on a base material, to perform the coating strength test, and each dual clamp unit comprises a clamp pull rod, a fish eye universal joint, a pin and a connecting pull rod; the clamp pull rod comprises a tension section and an installation section, one end of the tension section is used for connecting a coating strength tensile testing machine, the other end of the tension section is connected with the installation section, the installation section comprises two flat plate parts, the two flat plate parts are spaced and symmetrical with each other, the center line of the symmetrical plane of the two flat plate parts, which is symmetrical with each other, is collinear with the center line of the tension section, each flat plate part is provided with a cylindrical hole which is communicated along the thickness direction, and the cylindrical holes of the two flat plate parts are aligned with each other; the fisheye universal joint comprises a fisheye bearing section and a stud section, the fisheye bearing section comprises a fisheye bead, a limiting frame and an outer frame, the limiting frame is embedded in the outer frame, the fisheye bead is embedded in the limiting frame and can rotate relative to the limiting frame, the fisheye bead is a spherical bead and is provided with a through cylindrical through hole along a spherical center line, the fisheye bearing section is used for being positioned at an installation section of the clamp pull rod, the stud section is connected to the fisheye bearing section, the stud section is provided with external threads, and the axis of the stud section and the center line of a symmetrical plane of the two flat plate parts which are symmetrical to each other are collinear with the center line of the tension section; the pin is used for penetrating through the through hole of the fisheye bead of the fisheye bearing section of the fisheye universal joint and the cylindrical holes of the two flat plate parts of the mounting section of the clamp pull rod so as to fix the fisheye bead of the fisheye bearing section of the fisheye universal joint and fixedly connect the fisheye bearing section of the fisheye universal joint with the mounting section of the clamp pull rod; the connecting pull rod comprises a first connecting section and a second connecting section, the first connecting section is provided with an internal thread, the axis of the internal thread is collinear with the axis of the stud section of the fisheye universal joint, the internal thread is used for being matched with the external thread of the stud section so as to enable the first connecting section to be connected with the stud section of the fisheye universal joint, and the second connecting section is used for being fixedly connected to one surface of two opposite surfaces of a sample to be detected in an adhering mode; wherein the two dual jig units are arranged such that the centerlines of the tension segments of the two dual jig units are collinear when the tension segments of the two dual jig units are connected to the coating strength tensile testing machine.
In some embodiments, the tension segments are single flat segments.
In some embodiments, the clamp tie rod further comprises a chamfered transition section, the chamfered transition section connecting the tension section and the mounting section with a rounded chamfer.
In some embodiments, the fisheye gimbal further comprises an intermediate transition that necks down the fisheye bearing segment and the stud segment.
In some embodiments, the depth of the internal thread of the first connection section is greater than the length of the external thread of the stud section.
In some embodiments, the tie rod further comprises a centering transition section connecting the first and second connector sections.
In some embodiments, the first connecting section has a cylindrical shape, the second connecting section has a cylindrical shape smaller in diameter than the first connecting section, and the intermediate transition section has a frustoconical shape.
In some embodiments, the second connecting section is adapted to be directly adhesively fixedly connected to one of the opposite surfaces of the sample to be tested.
In some embodiments, the second connecting section is used for being indirectly fixedly connected to the one surface of the two opposite surfaces of the sample to be measured in an adhesive manner; each pair of coupling clamp units further comprises a clamp pull head, one end of the clamp pull head is detachably connected with the second connecting section, and the other end of the clamp pull head is used for being directly and fixedly adhered to the surface of the two opposite surfaces of the sample to be tested.
In some embodiments, the second connecting section is provided with an omega-shaped through hole at the end surface departing from the first connecting section, the axis of the omega-shaped through hole is perpendicular to the axis of the internal thread of the first connecting section of the connecting pull rod, and the bottom plane of the omega-shaped through hole is coincident with the end surface of the second connecting section; the clamp pull head comprises an omega-shaped pin shaft and a cylinder which are connected with each other, the omega-shaped pin shaft is matched with the omega-shaped through hole, the axis of the omega-shaped pin shaft is perpendicular to the axis of the cylinder, and the outer end face of the cylinder is used for being directly and fixedly connected to one surface of two opposite surfaces of a sample to be detected in an adhering mode.
The beneficial effects of this disclosure are as follows: in the clamp for testing the coating bonding strength, the fisheye universal joints are arranged by arranging the dual clamp units, the fisheye beads and the pins are fixed with the two flat plate parts together, the tension sections of the clamp pull rods are fixedly connected with a coating strength tensile testing machine, the sample to be tested, the two clamp sliders and the two connecting pull rods form an assembly, the limiting frames of the fisheye bearing sections of the dual clamp units and the outer frame, the fisheye beads, the pins, the two flat plate parts and the tension sections of the clamp pull rods, which are fixed together relatively, can rotate together with the whole stud section and the assembly, even if the transverse shearing force parallel to the coating is generated due to various reasons in the coating bonding strength testing process, the transverse shearing force parallel to the coating direction can be eliminated through the rotation, and the two dual clamp units are configured into the tension sections of the two dual clamp units to be connected with the coating strength tensile testing machine in the coating bonding strength testing process When the machine is stretched, the central lines of the tension sections of the two dual clamp units are collinear, so that after the transverse shear force is eliminated, the two dual clamp units are always subjected to axial force under the action of the tension of the coating strength tensile testing machine, and the consistency, repeatability, reliability and accuracy of the results of the coating strength tensile testing are further ensured.
Drawings
Fig. 1 is an assembly view of a fixture for coating bond strength testing according to the present disclosure, wherein two dual fixture units are rotated 90 degrees with respect to each other and a sample to be tested is shown for clarity of the structure.
Fig. 2 is an exploded view of the fixture for coating bond strength test of fig. 1, wherein the sample to be tested is not shown.
Fig. 3 is a front view of the clamp pull rod.
Fig. 4 is a side view of the clamp pull rod.
Fig. 5 is a top view of the clamp pull rod.
Fig. 6 is a front view of a fisheye gimbal.
FIG. 7 is a side view of a fisheye gimbal.
Fig. 8 is a front view of the connecting link.
Fig. 9 is a side view of the connecting rod.
Fig. 10 is a top view of the connecting rod.
Wherein the reference numerals are as follows:
100 coating bonding strength test is with middle changeover portion of anchor clamps 23
U two dual clamp unit 3 pin
1 clamp pull rod 4 connecting pull rod
11 tension section 41 first connection section
12 mounting section 411 internal thread
121 plate portion 42 second connecting segment
End surface of 121a cylindrical hole 421
13 chamfer transition section 422 omega-shaped through hole
2 fisheye gimbal 43 intermediate transition section
21 fisheye bearing section 5 clamp puller
211 fisheye bead 51 omega-shaped pin shaft
211a through hole 52 cylinder
212 limiting frame 521 outer end face
213 outer frame 200 sample to be tested
22 stud segment 200a substrate
221 external thread 200b coating
Detailed Description
The accompanying drawings illustrate embodiments of the present disclosure and it is to be understood that the disclosed embodiments are merely examples of the disclosure, which can be embodied in various forms, and therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure.
Referring to fig. 1 to 10, the jig 100 for coating bonding strength test includes two dual jig units U for fixedly connecting to opposite surfaces of a sample 200 to be tested having a coating layer 200b provided on a base material 200a, respectively, to perform a coating strength test. Note that, in fig. 1, a sample 200 to be measured is shown, and the upper side surface of a base material 200a of the sample 200 to be measured is provided with a coating layer 200 b. This allows testing of the bond strength of the individual coatings 200b to the substrate 200 a. Of course, in practical applications, the upper surface and the lower surface of the substrate 200a may be provided with the coatings 200b, and the sample 200 to be tested will be tested for the bonding strength of the two coatings 200b together with the substrate 200 a.
Referring to fig. 1 and 2, each mating gripper unit U includes a gripper pull rod 1, a fisheye gimbal 2, a pin 3, and a connecting pull rod 4.
Referring to fig. 2 and 3 to 5, the clamp pull rod 1 includes a tension segment 11 and a mounting segment 12. One end of the tension segment 11 is used for connecting a coating strength tensile tester, and the other end of the tension segment 11 is connected to the installation segment 12. The mounting section 12 includes two flat plate portions 121, the two flat plate portions 121 are spaced apart and symmetrical to each other, a center line of a symmetrical plane of the two flat plate portions 121 symmetrical to each other is collinear with a center line of the tension section 11, cylindrical holes 121a of the flat plate portions 121 penetrate through in the thickness direction, and the cylindrical holes 121a of the two flat plate portions 121 are aligned with each other.
The shape and size of the tension segment 11 is matched to the chuck of the coating strength tensile tester. In some embodiments, as shown in fig. 2 and 3-5, the tension segments 11 are single flat segments.
In some embodiments, as shown in fig. 2 and 3 to 5, the clamp rod 1 further includes a chamfered transition section 13, and the chamfered transition section 13 connects the tension section 11 and the installation section 12 by using a circular arc chamfer. In an example, as shown in fig. 2 and 3, the circular arc chamfer is a 45-degree circular arc chamfer, whereby the lower end of the chamfer transition section 13 connected with the mounting section 12 is square in a planar projection (as shown in fig. 5), and then the two flat plate portions 121 can further adopt a shape (as shown in fig. 3 to 5) matched with the lower end of the chamfer transition section 13, so that when the tension section 11 is a single flat plate section, it is very convenient to determine the center line of the tension section 11, the center line of the chamfer transition section 13, and the center line of the symmetrical plane of the two flat plate portions 121 symmetrical to each other, and thus it becomes very easy to realize that the center line of the tension section 11, the center line of the chamfer transition section 13, and the center line of the symmetrical plane of the two flat plate portions 121 symmetrical to each other are collinear.
In some embodiments, as shown in fig. 1-5, the tension segments 11, the mounting segments 12, and the chamfered transition segments 13 are integrally formed, such as by casting, machining, and the like. In order to improve the strength and the service life of the clamp pull rod 1, the clamp pull rod 1 is made of metal materials, such as 45# steel.
Referring to fig. 1, 2 and 6 and 7, the fisheye gimbal 2 includes a fisheye bearing section 21 and a stud section 22.
The fisheye bearing section 21 includes a fisheye bead 211, a retaining frame 212, and an outer frame 213. Spacing frame 212 is inlayed in frame 213, and fisheye pearl 211 is inlayed in spacing frame 212 and can rotate relative spacing frame 212, and fisheye pearl 211 is spherical pearl and sets up the cylindrical through-hole 211a that link up along the centre of sphere line. The fisheye bearing section 21 is used for positioning on the mounting section 12 of the clamp rod 1. The stud section 22 is connected to the fisheye bearing section 21, the stud section 22 is provided with external threads 221, and the axis of the stud section 22 and the center line of the symmetrical plane of the two flat plate parts 121 which are symmetrical to each other are collinear with the center line of the tension section 11.
The fish-eye beads 211 may be made of metal (e.g., steel), thereby increasing the lifespan. The depth of the cylindrical through-hole 211a matches the distance by which the two flat plate portions 121 are spaced apart from each other.
When the fisheye bearing section 21 is mounted on the two flat plate parts 121 of the mounting section 12 of the clamp pull rod 1, the cylindrical through holes 211a of the fisheye beads 211 are aligned with the cylindrical holes 121a of the two flat plate parts 121, and then the pins 3 are inserted into the cylindrical through holes 211a of the fisheye beads 211 and the cylindrical holes 121a of the two flat plate parts 121, so that the fisheye beads 211 and the pins 3 are fixed with the two flat plate parts 121, and the limiting frame 212 and the outer frame 213 have the capability of rotating by any small angle relative to the fixed fisheye beads 21 based on the relative rotation.
In some embodiments, as shown in fig. 1, 2 and 7, the diameter of the screw section 22 is smaller than the depth of the cylindrical through hole 211a (i.e., the dimension in the left-right direction of fig. 7) to avoid interference with the installation of the fisheye bearing section 21 and the two flat plate portions 121 of the installation section 12 of the clamp rod 1.
Similarly, the outer frame 213 of the fisheye bearing section 21 and the stud section 22 are integrally formed, for example, by casting, machining, or the like. In order to improve the strength and the service life of the outer frame 213 and the stud segment 22 of the fisheye bearing segment 21, the outer frame 213 and the stud segment 22 of the fisheye bearing segment 21 are made of metal, such as 45# steel.
In some embodiments, referring to fig. 1, 2, and 6 and 7, the fisheye gimbal 2 further comprises an intermediate transition section 23, the intermediate transition section 23 necking down the fisheye bearing section 21 and the stud section 22.
Referring to fig. 1 and 2, the pin 3 is used to pass through the through hole 211a of the fisheye bead 211 of the fisheye bearing section 21 of the fisheye gimbal 2 and the cylindrical holes 121a of the two flat plate portions 121 of the mounting section 12 of the clamp rod 1, so as to fix the fisheye bead 211 of the fisheye bearing section 21 of the fisheye gimbal 2 and to fixedly connect the fisheye bearing section 21 of the fisheye gimbal 2 with the mounting section 12 of the clamp rod 1. The diameter of the pin 3 forms an interference fit with the through hole 211a of the fisheye bead 211 and the cylindrical holes 121a of the two flat plate parts 121, so that the fisheye bead 211, the pin 3 and the two flat plate parts 121 are fixed together to form a fixed part of the relative limit frame 212 and the outer frame 213. Likewise, the pin 3 is shaped, for example, by casting, machining, or the like. For the strength and the service life of the pin 3, the pin 3 is made of metal, such as 45# steel.
Referring to fig. 1, 2 and 8 to 10, the connecting link 4 includes a first connecting section 41 and a second connecting section 42. The first connecting section 41 is provided with an internal thread 411, the axis of the internal thread 411 is collinear with the axis of the stud section 22 of the fisheye universal joint 2, the internal thread 411 is used for being matched with the external thread 221 of the stud section 22 so as to connect the first connecting section 41 with the stud section 22 of the fisheye universal joint 2, and the second connecting section 42 is used for being fixedly connected to one of two opposite surfaces of the sample 200 to be detected in an adhesion mode.
In one embodiment, the depth of the internal thread 411 of the first connection section 41 is greater than the length of the external thread 221 of the stud section 22. That is, when the stud segment 22 is completely screwed into the internal thread 411 of the first connecting segment 41, the bottom of the stud segment 22 is spaced from the bottom of the internal thread 411 of the first connecting segment 41, so that not only the stability of the transmission of the tensile force applied in the tensile test of the coating strength during the tensile test of the coating strength can be improved by fully and completely utilizing the whole stud segment 22, but also the limiting frame 212 and the outer frame 213 of the fisheye bearing segment 21 and the whole stud segment 22 are ensured to be relatively fixed in the rotating angle range of the fisheye bead 211, the pin 3 and the two flat plate portions 121. In one embodiment, as shown in fig. 10, the first connection section 41 has a cylindrical shape, so that the internal thread 411 can be centrally located and the axis of the internal thread 411 can be easily determined.
In some embodiments, the second connecting section 42 is cylindrical in shape with a smaller diameter than the first connecting section 41, thereby facilitating determination of the axis of the second connecting section 42.
In some embodiments, as shown in fig. 1, 2 and 8-10, the connecting tie rod 4 further comprises a central transition section 43, the central transition section 43 connecting the first connecting section 41 and the second connecting section 42. Referring to fig. 8 and 9, in one example, the intermediate transition section 43 is frustoconical.
Likewise, the first connecting section 41, the second connecting section 42 and the intermediate transition section 43 of the connecting link 4 are integrally formed, for example by casting, machining or the like. In order to improve the strength and the service life of the connecting pull rod 4, the connecting pull rod 4 is made of metal, such as 45# steel.
In order to achieve the coaxial line stretching, in the jig 100 for coating bond strength test, referring to fig. 1, two dual jig units U are arranged such that the center lines of the tension segments 11 of the two dual jig units U are collinear when the tension segments 11 of the two dual jig units U are connected to the coating strength tensile tester.
In use of the dual clamp unit U, in one example, the second connecting section 42 is adapted to be directly adhesively fixedly attached to one of the opposing surfaces of the sample 200 to be tested.
In use of the dual clamp unit U, in another example, referring to fig. 1 and 2, the second connecting section 42 is used for indirect adhesive fixed connection to the one of the opposite surfaces of the sample 200 to be tested; each even clamp unit U further comprises a clamp slider 5, one end of the clamp slider 5 is detachably connected with the second connecting section 42, and the other end of the clamp slider 5 is used for being directly fixedly adhered to the one of the two opposite surfaces of the sample 200 to be tested.
Specifically, referring to fig. 1 and 2, the second connecting section 42 is provided with an omega-shaped through hole 422 at an end surface 421 away from the first connecting section 41, an axis of the omega-shaped through hole 422 is perpendicular to an axis of the internal thread 411 of the first connecting section 41 of the connecting pull rod 4, and a bottom plane of the omega-shaped through hole 422 coincides with the end surface 421 of the second connecting section 42; the clamp slider 5 comprises an omega-shaped pin shaft 51 and a cylinder 52 which are connected with each other, the omega-shaped pin shaft 51 is matched with the omega-shaped through hole 422, the axis of the omega-shaped pin shaft 51 is vertical to the axis of the cylinder 52, and the outer end surface 521 of the cylinder 52 is used for being directly fixedly connected with one surface of two opposite surfaces of the sample 200 to be detected in an adhering mode.
In one example, the omega-shaped pin 51 and the omega-shaped through hole 422 are in interference fit, so that the assembled clamp slider 5 and the second connecting section 42 of the connecting rod 4 form an integral structure which is fixed relative to each other when the dual clamp unit U is used.
Similarly, the jig slider 5 is integrally molded by, for example, casting, machining, or the like. In order to improve the strength and the service life of the clamp slider 5, the clamp slider 5 is made of metal, such as 45# steel.
The detachable assembly of the clamp slider 5 and the second connecting section 42 of the connecting pull rod 4 facilitates the installation of the sample 200 to be tested.
When the two dual jig units U are connected to the coating strength tensile testing machine, the postures of fig. 1 and 2 may be adopted, that is, the two dual jig units U are rotated by 90 degrees relative to each other, so that the limiting frames 212 and the outer frames 213 of the fisheye bearing sections 21 of the two dual jig units U and the whole screw column section 22 are fixed relatively to a fisheye bead 211, the pin 3 and the rotation angle of the two flat plate portions 121 are doubled for use, and the application range of eliminating the shearing force parallel to the coating 200b is expanded.
Of course, the postures of fig. 1 and 2 may not be adopted, that is, when the two dual jig units U are connected to the coating strength tensile testing machine, the two dual jig units U adopt the same posture, and thus the angle of rotation of the limiting frame 212 and the outer frame 213 of the fisheye bearing section 21 of the two dual jig units U and the entire stud section 22 are fixed relatively to the one fisheye bead 211, the pin 3 and the two flat plate portions 121 is smaller than the postures of fig. 1 and 2, but the shear force parallel to the coating 200b can be eliminated as long as the setting of the rotation angle is sufficient to eliminate the shear force parallel to the coating 200 b.
Finally, the method of using the fixture 100 for coating bond strength testing will be described with reference to all of the components of fig. 1 and 2.
The use method of the clamp 100 for the coating bonding strength test comprises the following steps: the omega-shaped pin shaft 51 is in interference fit with the omega-shaped through hole 422 to realize the assembly of the clamp pull head 5 and the connecting pull rod 4; uniformly coating adhesive on the outer end surfaces 521 of the cylinders 52 of the two clamp sliders 5, placing the sample 200 to be tested between the outer end surfaces 521 of the two clamp sliders 5 and in the middle of the two outer end surfaces 521, so that two surfaces (an upper surface and a lower surface in fig. 1) of the sample 200 to be tested are respectively and tightly adhered to the two outer end surfaces 521 of the two clamp sliders 4; placing the two clamp sliders 5 and the connecting pull rod 4 which are bonded with the sample 200 to be tested in an oven for drying, and forming a combination of the sample 200 to be tested, the two clamp sliders 5 and the two connecting pull rods 4 after the bonding glue is completely cured; screwing the stud section 22 of each fisheye universal joint 2 into the internal thread 411 of the corresponding connecting pull rod 4 so as to assemble each fisheye universal joint 2 with the corresponding connecting pull rod 4; inserting the fisheye bearing section 21 of the fisheye universal joint 2 into the space between the two flat plate parts 121 of the mounting section 12 of the clamp pull rod 1, aligning the through hole 211a of the fisheye bead 211 of the fisheye bearing section 21 of the fisheye universal joint 2 with the cylindrical holes 121a of the two flat plate parts 121 of the mounting section 12 of the clamp pull rod 1, and passing a pin 3 through the through hole 211a of the fisheye bead 211 of the fisheye bearing section 21 of the fisheye universal joint 2 and the cylindrical holes 121a of the two flat plate parts 121 of the mounting section 12 of the clamp pull rod 1 to fix the fisheye bead 211 of the fisheye bearing section 21 of the fisheye universal joint 2 and fixedly connect the fisheye bearing section 21 of the fisheye universal joint 2 with the mounting section 12 of the clamp pull rod 1, thereby completing the assembly of the fisheye universal joint 2 and the clamp pull rod 1; and connecting one end of each tension section 11 of the clamp pull rod 1 with a coating strength tensile testing machine, and then carrying out subsequent coating strength tensile testing.
In the clamp 100 for testing the coating bonding strength of the present disclosure, by providing each pair of paired clamp units U with the fisheye universal joint 2, since the fisheye beads 211 and the pins 3 are fixed together with the two flat plate portions 121 and since each tension segment 11 of the clamp pull rod 1 is fixedly connected to the coating strength tensile tester, and since the sample 200 to be tested, the two clamp sliders 5 and the two connecting pull rods 4 form an assembly, the limit frames 212 and the outer frames 213 of the fisheye bearing segments 21 of the two paired clamp units U, together with the entire stud segment 22 and the assembly, can be rotated relative to the fisheye beads 211, the pins 3, the two flat plate portions 121 and each tension segment 11 of the clamp pull rod 1 fixed together, even if the transverse shear force parallel to the coating 200b is generated due to various reasons during the coating bonding strength test, the transverse shear force parallel to the coating 200b direction can be eliminated by such rotation, since the two dual clamp units U are configured such that the center lines of the tension sections 11 of the two dual clamp units U are collinear when the tension sections 11 of the two dual clamp units U are connected to the coating strength tensile tester in the coating bonding strength testing process, after such a transverse shearing force is eliminated, the two dual clamp units U always receive an axial force (a force which is collinear in the up-down direction of fig. 1) under the tensile force of the coating strength tensile tester, thereby ensuring the consistency, repeatability, reliability and accuracy of the results of the coating strength tensile test. In addition, since the components of each pair of coupling jig units U are detachably assembled, the operation of the jig 100 for coating bonding strength test is simple and convenient.
The above detailed description is used to describe a number of exemplary embodiments, but is not intended to limit the combinations explicitly disclosed herein. Thus, unless otherwise specified, various features disclosed herein can be combined together to form a number of additional combinations that are not shown for the sake of brevity.
Claims (10)
1. A clamp (100) for testing the bonding strength of a coating comprises two dual clamp units (U) which are respectively used for being fixedly connected with two opposite surfaces of a sample (200) to be tested, which is provided with a coating (200b) on a base material (200a), so as to test the strength of the coating,
each dual clamp unit (U) comprises a clamp pull rod (1), a fisheye universal joint (2), a pin (3) and a connecting pull rod (4);
the clamp pull rod (1) comprises a tension section (11) and a mounting section (12), one end of the tension section (11) is used for connecting a coating strength tensile testing machine, the other end of the tension section (11) is connected to the mounting section (12), the mounting section (12) comprises two flat plate parts (121), the two flat plate parts (121) are spaced from each other and are symmetrical to each other, the center line of the symmetrical plane of the two flat plate parts (121) is collinear with the center line of the tension section (11), each flat plate part (121) is provided with a cylindrical hole (121a) penetrating in the thickness direction, and the cylindrical holes (121a) of the two flat plate parts (121) are aligned to each other;
the fisheye universal joint (2) comprises a fisheye bearing section (21) and a stud section (22), the fisheye bearing section (21) comprises a fisheye bead (211), a limiting frame (212) and an outer frame (213), the limiting frame (212) is embedded in the outer frame (213), the fisheye bead (211) is embedded in the limiting frame (212) and can rotate relative to the limiting frame (212), the fisheye bead (211) is a spherical bead and is provided with a through cylindrical through hole (211a) along a spherical center line, the fisheye bearing section (21) is used for being positioned at an installation section (12) of the clamp pull rod (1), the stud section (22) is connected to the fisheye bearing section (21), the stud section (22) is provided with an external thread (221), and the center line of a symmetrical plane of the axis of the stud section (22) and the two flat plate parts (121) which are symmetrical to each other is collinear with the center line of the tension section (11);
the pin (3) is used for penetrating through a through hole (211a) of a fisheye bead (211) of a fisheye bearing section (21) of the fisheye universal joint (2) and cylindrical holes (121a) of two flat plate parts (121) of a mounting section (12) of the clamp pull rod (1) so as to fix the fisheye bead (211) of the fisheye bearing section (21) of the fisheye universal joint (2) and fixedly connect the fisheye bearing section (21) of the fisheye universal joint (2) with the mounting section (12) of the clamp pull rod (1);
the connecting pull rod (4) comprises a first connecting section (41) and a second connecting section (42), wherein the first connecting section (41) is provided with an internal thread (411), the axis of the internal thread (411) is collinear with the axis of the stud section (22) of the fisheye universal joint (2), the internal thread (411) is used for being matched with an external thread (221) of the stud section (22) to enable the first connecting section (41) to be connected with the stud section (22) of the fisheye universal joint (2), and the second connecting section (42) is used for being fixedly connected to one surface of two opposite surfaces of a sample (200) to be detected in an adhesion mode;
wherein the two dual jig units (U) are arranged such that the center lines of the tension segments (11) of the two dual jig units (U) are collinear when the tension segments (11) of the two dual jig units (U) are connected to the coating strength tensile testing machine.
2. The fixture (100) for coating bond strength test according to claim 1, wherein the tension segment (11) is a single flat segment.
3. The clamp (100) for testing the coating bonding strength according to claim 1, wherein the clamp tie rod (1) further comprises a chamfered transition section (13), and the chamfered transition section (13) connects the tension section (11) and the installation section (12) by using a circular arc chamfer.
4. The clamp (100) for testing coating bond strength according to claim 1, wherein the fisheye gimbal (2) further comprises an intermediate transition section (23), the intermediate transition section (23) neck-connecting the fisheye bearing section (21) and the stud section (22).
5. The clamp (100) for coating bond strength test according to claim 1, wherein the depth of the internal thread (411) of the first connection section (41) is greater than the length of the external thread (221) of the stud section (22).
6. The clamp (100) for testing the coating bond strength according to claim 1, wherein the tie rod (4) further comprises a central transition section (43), the central transition section (43) connecting the first connection section (41) and the second connection section (42).
7. The clamp (100) for testing the coating bonding strength according to claim 6, wherein the first connecting section (41) has a cylindrical shape, the second connecting section (42) has a cylindrical shape smaller in diameter than the first connecting section (41), and the intermediate transition section (43) has a truncated cone shape.
8. The clamp (100) for testing coating bonding strength according to claim 1, wherein the second connecting section (42) is adapted to be directly adhesively fixedly connected to one of the opposite surfaces of the sample (200) to be tested.
9. The coating bond strength test fixture (100) of claim 1,
the second connecting section (42) is used for being indirectly fixedly connected to the one surface of the two opposite surfaces of the sample (200) to be measured in an adhesive way;
each dual clamp unit (U) further comprises a clamp pull head (5), one end of the clamp pull head (5) is detachably connected with the second connecting section (42), and the other end of the clamp pull head (5) is used for being directly fixedly connected with the surface of the sample to be tested (200) in an adhering mode.
10. The coating bond strength test fixture (100) of claim 9,
an omega-shaped through hole (422) is formed in the end face (421) of the second connecting section (42) which is far away from the first connecting section (41), the axis of the omega-shaped through hole (422) is perpendicular to the axis of the internal thread (411) of the first connecting section (41) of the connecting pull rod (4), and the bottom plane of the omega-shaped through hole (422) is overlapped with the end face (421) of the second connecting section (42);
the clamp pull head (5) comprises an omega-shaped pin shaft (51) and a cylinder (52) which are connected with each other, the omega-shaped pin shaft (51) is matched with the omega-shaped through hole (422), the axis of the omega-shaped pin shaft (51) is vertical to the axis of the cylinder (52), and the outer end surface (521) of the cylinder (52) is used for being directly fixedly adhered to one surface of two opposite surfaces of the sample (200) to be detected.
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