CN114486506B - Clamp for testing bonding strength of coating - Google Patents
Clamp for testing bonding strength of coating Download PDFInfo
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- CN114486506B CN114486506B CN202210099977.8A CN202210099977A CN114486506B CN 114486506 B CN114486506 B CN 114486506B CN 202210099977 A CN202210099977 A CN 202210099977A CN 114486506 B CN114486506 B CN 114486506B
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- 238000000576 coating method Methods 0.000 title claims abstract description 84
- 239000011248 coating agent Substances 0.000 title claims abstract description 81
- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 239000011324 bead Substances 0.000 claims abstract description 34
- 230000009977 dual effect Effects 0.000 claims abstract description 28
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 230000007704 transition Effects 0.000 claims description 27
- 239000000758 substrate Substances 0.000 claims description 11
- 238000009864 tensile test Methods 0.000 claims description 8
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 241000251468 Actinopterygii Species 0.000 abstract description 12
- 238000010008 shearing Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 238000003754 machining Methods 0.000 description 5
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000036544 posture Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 210000003739 neck Anatomy 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
Classifications
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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
-
- 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 present disclosure provides a clamp for testing coating bonding strength, comprising two dual clamp units, each dual clamp unit comprising 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 a mounting section, the mounting section comprises two flat plate parts, the two flat plate parts are spaced apart from each other, each flat plate part is provided with a cylindrical hole penetrating in the thickness direction, and the cylindrical holes of the two flat plate parts are aligned with each other; the fish-eye universal joint comprises a fish-eye bearing section and a stud section, wherein the fish-eye bearing section comprises a fish-eye bead, a limiting frame and an outer frame, the fish-eye bead is provided with a through cylindrical through hole, and the stud section is provided with external threads; the pin is used for penetrating through the through hole of the fish eye 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, wherein the first connecting section is provided with internal threads, the internal threads are used for being matched with external threads of the stud section, and the second connecting section is used for being fixedly connected to a sample to be tested in an adhering mode. Thereby, transverse shear forces parallel to the coating direction can be eliminated.
Description
Technical Field
The present disclosure relates to the field of coatings, and more particularly 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, and is directly related to the durability and integrity of the coating, with the most direct consequence of insufficient bond strength being coating bulging, cracking, and even spalling. Good bonding strength is a precondition for the coating to perform its function.
Typical coating bond strength characterization methods include stretching, indentation, and improved toughness testing. The tensile method for measuring the bonding strength of the coating material has the defects of overestimated bonding strength, uncontrollable coating failure position and the like due to the use of an adhesive, but has simple test principle and convenient operation, and becomes the most common coating bonding strength evaluation method.
The bonding strength of the coating material is measured by a stretching method, namely, a sample with the coating is fixed on a designed bonding strength test fixture, the fixture and the sample are pulled apart at a certain stretching rate by a universal mechanical tester, the load and displacement in the stretching process are recorded, and the bonding strength value of the coating material is calculated and obtained, specifically, the maximum load value is divided by the area of the applied load (P=F/S, wherein the P unit is MPa, the F unit is N, and the S unit is m 2). However, this method requires that the coating and substrate are only subjected to tensile forces applied by the tensile tester, and not to shear forces parallel to the coating direction. If the clamp is inclined during loading or the sample to be tested is not concentrically fixed with the dual clamp, 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 is invalid.
Disclosure of Invention
In view of the problems in the background art, an object of the present disclosure is to provide a fixture for testing bonding strength of a coating, which can eliminate a transverse shearing force parallel to a coating direction, and further ensure consistency, repeatability, reliability and accuracy of a result of a tensile test of the coating strength.
Thus, in some embodiments, a coating bond strength test fixture includes two dual fixture units for fixedly connecting with opposite surfaces of a sample to be tested having a coating disposed on a substrate, respectively, for performing a coating strength test, each dual fixture unit including a fixture pull rod, a fisheye universal joint, a pin, and a connection pull rod; the fixture pull rod comprises a pull section and a mounting section, one end of the pull section is used for being connected with a coating strength tensile testing machine, the other end of the pull section is connected with the mounting section, the mounting section comprises two flat plate parts, the two flat plate parts are spaced apart and symmetrical to each other, the central line of a symmetrical plane of the two flat plate parts is collinear with the central line of the pull section, each flat plate part is provided with a cylindrical hole penetrating in the thickness direction, and the cylindrical holes of the two flat plate parts are aligned with each other; the fish eye universal joint comprises a fish eye bearing section and a stud section, wherein the fish eye bearing section comprises a fish eye bead, a limiting frame and an outer frame, the limiting frame is embedded in the outer frame, the fish eye bead is embedded in the limiting frame and can rotate relative to the limiting frame, the fish eye bead is a spherical bead and is provided with a through cylindrical through hole along a spherical center line, the fish eye bearing section is used for being positioned at a mounting section of a clamp pull rod, the stud section is connected to the fish eye bearing section, the stud section is provided with external threads, and the axis of the stud section and the central line of a symmetrical plane of two flat plate parts are collinear with the central line of a tension section; the pin is used for penetrating through the through holes of the fisheye beads 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 beads 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 matched with the external thread of the stud section to connect the first connecting section with the stud section of the fisheye universal joint, and the second connecting section is fixedly connected to one of the two opposite surfaces of the sample to be tested in an adhering manner; wherein the two dual clamp units are configured such that the center lines of the tension segments of the two dual clamp units are collinear when the tension segments of the two dual clamp units are connected to the coating strength tensile tester.
In some embodiments, the tension section is a single flat plate section.
In some embodiments, the clamp pull rod further includes a chamfer transition segment that connects the tension segment and the mounting segment with a rounded chamfer.
In some embodiments, the fisheye-joint further comprises an intermediate transition section that necks the fisheye bearing section and the stud section.
In some embodiments, the first connection section has an internal thread depth that is greater than a length of the external thread of the stud section.
In some embodiments, the connecting rod further comprises a centering transition section connecting the first connecting section and the second connecting section.
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 secured to one of the opposite surfaces of the sample to be tested.
In some embodiments, the second connecting section is configured to be indirectly adhesively fixedly attached to the one of the opposite surfaces of the sample to be tested; each dual clamp unit 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 adhered and fixedly connected to one of 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 facing away 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 coincides with the end surface of the second connecting section; the fixture 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 adhered and fixedly connected to one of the two opposite surfaces of the sample to be tested.
The beneficial effects of the present disclosure are as follows: in the clamp for testing the bonding strength of the coating, the fisheye universal joint is arranged by arranging each pair of clamp units, and as the fisheye bead, the pin and the two flat plate parts are fixed together and as the tension sections of the clamp pull rods are fixedly connected to the tensile tester for testing the strength of the coating, and as the sample to be tested, the two clamp pull heads and the two connecting pull rods form a combined body, the limiting frame and the outer frame of the fisheye bearing section of the two pair of clamp units together with the whole stud section and the combined body can rotate relative to the fisheye bead, the pin, the two flat plate parts and the tension sections of the clamp pull rods together, even if transverse shearing force parallel to the direction of the coating is generated due to various reasons in the process of testing the bonding strength of the coating, the transverse shearing force parallel to the direction of the coating can be eliminated by the rotation, and as the center lines of the tension sections of the two pair of clamp units are collinear when the tension sections of the two pair of clamp units are configured to be connected with the tensile tester for testing the strength of the coating in the process of the bonding strength of the coating, after eliminating the transverse shearing force, the tensile force of the two pair of clamp units always act on the tensile tester for testing the strength of the coating, and the tensile strength of the coating, and the reliability of the tensile strength of the coating can be 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 relative to each other and a sample to be tested is shown for clarity of illustration of the structure.
Fig. 2 is an exploded view of the fixture for coating bond strength testing of fig. 1, wherein the sample to be tested is not shown.
Fig. 3 is a front view of the clamp lever.
Fig. 4 is a side view of a clamp pull rod.
Fig. 5 is a top view of the clamp lever.
Fig. 6 is a front view of the fish-eye joint.
Fig. 7 is a side view of the fish-eye joint.
Fig. 8 is a front view of the connecting rod.
Fig. 9 is a side view of the connecting rod.
Fig. 10 is a top view of the connecting rod.
Wherein reference numerals are as follows:
Intermediate transition section of clamp 23 for testing bonding strength of 100 coating
U two dual clamp units 3 pin
1 Clamp pull rod 4 connecting pull rod
11 First connecting section of tension section 41
12 Mounting section 411 internal threads
121 Plate portion 42 second connecting section
121A cylindrical hole 421 end face
422 Omega-shaped through hole of 13-chamfer transition section
2-Fish-eye universal joint 43 centering transition section
21 Fisheye bearing section 5 anchor clamps pull head
211 Fish eye pearl 51 omega type pin shaft
211A through hole 52 cylinder
212 Limit frame 521 outer end face
213 Outer frame 200 sample to be measured
22 Stud segment 200a substrate
221 External thread 200b coating
Detailed Description
The drawings illustrate embodiments of the present disclosure, and it is to be understood that the disclosed embodiments are merely examples of the disclosure that may be embodied in various forms and that, 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 practice the disclosure.
Referring to fig. 1 to 10, the jig 100 for coating bonding strength test includes two dual jig units U for fixedly connecting opposite surfaces of a sample 200 to be tested having a coating 200b disposed on a substrate 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 substrate 200a of the sample 200 to be measured is provided with a coating layer 200b. This allows the bond strength of the individual coatings 200b to the substrate 200a to be tested. Of course, in practical applications, both the upper side surface and the lower side surface of the substrate 200a may be provided with the coating 200b, and at this time, 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 dual clip unit U includes a clip pull rod 1, a fisheye universal joint 2, a pin 3, and a connection pull rod 4.
Referring to fig. 2 and 3 to 5, the clamp pull rod 1 includes a tension section 11 and a mounting section 12. One end of the tension section 11 is used for connecting a coating strength tensile tester, and the other end of the tension section 11 is connected to the mounting section 12. The mounting section 12 includes two flat plate portions 121 spaced apart from each other 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 penetrating each flat plate portion 121 in a 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 section 11 are matched to the chuck of the coating strength tensile tester. In some embodiments, as shown in fig. 2 and 3-5, the tension section 11 is a single flat plate section.
In some embodiments, as shown in fig. 2 and 3-5, the clamp pull rod 1 further includes a chamfer transition section 13, the chamfer transition section 13 connecting the tension section 11 and the mounting section 12 with a circular arc chamfer. In an example, as shown in fig. 2 and 3, the circular arc chamfer adopts 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 plan projection (as shown in fig. 5), and further the two flat plate portions 121 may further take a shape matching with the lower end of the chamfer transition section 13 (as shown in fig. 3 to 5), so that when the tension section 11 is a single flat plate section, it becomes very easy 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 symmetry plane of the two flat plate portions 121 symmetrical to each other, so that it becomes very easy to achieve that the center line of the tension section 11, the center line of the chamfer transition section 13, and the center line of the symmetry 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 segment 11, the mounting segment 12, and the chamfer transition segment 13 are integrally formed, such as by casting, machining, or 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 and the like.
Referring to fig. 1, 2 and 6 and 7, the fisheye-joint 2 includes a fisheye bearing section 21 and a stud section 22.
The fisheye bearing section 21 includes a fisheye bead 211, a stop frame 212, and an outer frame 213. The limiting frame 212 is embedded in the outer frame 213, the fish eye beads 211 are embedded in the limiting frame 212 and can rotate relative to the limiting frame 212, the fish eye beads 211 are spherical beads, and through cylindrical through holes 211a are formed along the spherical center line. The fish eye bearing section 21 is intended to be positioned at the mounting section 12 of the clamp pull rod 1. The stud segment 22 is connected to the fish-eye bearing segment 21, the stud segment 22 is provided with external threads 221, and the center line of the symmetry plane where the axis of the stud segment 22 and the two flat plate portions 121 are symmetrical to each other is collinear with the center line of the tension segment 11.
The fisheye 211 may be made of metal (e.g., steel) to improve the service life. 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, the pins 3 and the two flat plate parts 121 are fixed together, and the limit 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 rotation relativity.
In some embodiments, as shown in fig. 1,2 and 7, the diameter of the stud segment 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 segment 21 with the two flat plate portions 121 of the mounting segment 12 of the clamp pull 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 materials, such as 45# steel.
In some embodiments, referring to fig. 1, 2, and 6 and 7, the fisheye gimbal 2 further includes an intermediate transition section 23, the intermediate transition section 23 necking 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 holes 211a of the fisheye beads 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 beads 211 of the fisheye bearing section 21 of the fisheye universal joint 2 and to 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 diameter of the pin 3 forms interference fit with the through hole 211a of the fisheye bead 211 and the cylindrical holes 121a of the two flat plate parts 121, thereby realizing that the fisheye bead 211, the pin 3 and the two flat plate parts 121 are fixed together to form an immovable piece relative to the limiting frame 212 and the outer frame 213. Similarly, the pin 3 is molded by casting, machining, or the like, for example. For the strength and 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 rod 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-gimbal 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-gimbal 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 tested in an adhering manner.
In one embodiment, the internal threads 411 of the first connection section 41 have a depth greater than the length of the external threads 221 of the stud section 22. That is, when the stud segment 22 is completely screwed into the internal thread 411 of the first connection segment 41, there is a space between the bottom of the stud segment 22 and the bottom of the internal thread 411 of the first connection segment 41, so that not only can the stability of the tensile force transmission applied by the coating strength tensile test be improved by fully and completely utilizing the whole stud segment 22, but also the rotation angle ranges of the fisheye bearing segment 21, the fisheye bead 211, the pin 3 and the two flat plate parts 121 are ensured by relatively fixing the limit frame 212 and the outer frame 213 of the fisheye bearing segment 21 together with the whole stud segment 22. As shown in fig. 10, in one embodiment, the first connection section 41 is cylindrical in shape, whereby the internal thread 411 may be centrally located, also facilitating the determination of the axis of the internal thread 411.
In some embodiments, the second connecting section 42 is cylindrical in shape smaller in 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 rod 4 further includes a centering transition section 43, the centering 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 centering 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 rod 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 rod 4, the connecting rod 4 is made of metal, such as 45# steel.
In order to realize the coaxial line stretching, in the jig 100 for coating bonding strength test, referring to fig. 1, two pair jig units U are arranged such that the center lines of the tension sections 11 of the two pair jig units U are collinear when the tension sections 11 of the two pair 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 secured to one of the opposite surfaces of the sample 200 to be tested.
In use of the dual jig unit U, in another example, referring to fig. 1 and 2, the second connecting section 42 is adapted to be indirectly adhesively fixedly connected to one of the opposite surfaces of the sample 200 to be measured; each dual jig unit U further includes a jig pull head 5, one end of the jig pull head 5 being detachably connected to the second connecting section 42, and the other end of the jig pull head 5 being adapted to be directly bonded fixedly connected to one of opposite surfaces of the sample 200 to be measured.
Specifically, referring to fig. 1 and 2, the second connecting section 42 is provided with an Ω -shaped through hole 422 at an end surface 421 facing away from the first connecting section 41, the axis of the Ω -shaped through hole 422 is perpendicular to the axis of the internal thread 411 of the first connecting section 41 of the connecting rod 4, and the bottom plane of the Ω -shaped through hole 422 coincides with the end surface 421 of the second connecting section 42; the fixture pull head 5 comprises an omega-shaped pin 51 and a cylinder 52 which are connected with each other, wherein the omega-shaped pin 51 is matched with the omega-shaped through hole 422, the axis of the omega-shaped pin 51 is perpendicular to the axis of the cylinder 52, and the outer end surface 521 of the cylinder 52 is used for being directly and fixedly connected to one of two opposite surfaces of the sample 200 to be tested.
In one example, the omega-shaped pin 51 and the omega-shaped through hole 422 are in an interference fit, whereby the assembled clamp pull head 5 and the second connecting section 42 of the connecting rod 4 form an integral structure that is stationary relative to each other when the dual clamp unit U is in use.
Similarly, the jig slider 5 is integrally molded by casting, machining, or the like, for example. In order to improve the strength and the service life of the fixture pull head 5, the fixture pull head 5 is made of metal, such as 45# steel.
The fixture pull head 5 is detachably assembled with the second connecting section 42 of the connecting pull rod 4, so that the sample 200 to be tested is convenient to install.
When the two dual jig units U are connected to the coating strength tensile tester, the postures of fig. 1 and 2, that is, the two dual jig units U are rotated 90 degrees with respect to each other, so that the limit frame 212 of the fisheye bearing section 21 of the two dual jig units U and the outer frame 213 are relatively fixed together with the whole stud section 22, the fisheye bead 211, the pin 3 and the rotation angle of the two flat plate sections 121 are doubled, and the use range for canceling the shearing force parallel to the coating 200b is enlarged.
Of course, the posture of fig. 1 and 2 may not be adopted, that is, when the two pair clamp units U are connected to the coating strength tensile tester, the two pair clamp units U adopt the same posture, so that the limit frame 212 and the outer frame 213 of the fisheye bearing section 21 of the two pair clamp units U are relatively fixed together with the whole stud section 22, and the angles of rotation of the fisheye bead 211, the pin 3 and the two flat plate sections 121 are smaller than those of fig. 1 and 2, but the shearing force parallel to the coating 200b can be eliminated as long as the setting of such rotation angle is satisfied to eliminate the shearing force parallel to the coating 200 b.
Finally, the method of using the coating bond strength test jig 100 will be described with reference to all of the components of fig. 1 and 2.
The method for using the jig 100 for testing the bonding strength of a coating layer includes the steps of: the omega-shaped pin shaft 51 is in interference fit with the omega-shaped through hole 422 to realize the assembly of the fixture pull head 5 and the connecting pull rod 4; uniformly smearing adhesive on the outer end faces 521 of the cylinders 52 of the two fixture pull heads 5, placing the sample 200 to be tested between the outer end faces 521 of the two fixture pull heads 5 and at the middle position of the two outer end faces 521, and tightly adhering two sides (upper and lower sides in fig. 1) of the sample 200 to be tested with the two outer end faces 521 of the two fixture pull heads 4 respectively; placing the two fixture pull heads 5 and the connecting pull rods 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 fixture pull heads 5 and the two connecting pull rods 4 after the bonding glue is completely solidified; screwing the stud segments 22 of each fish-eye universal joint 2 into the internal threads 411 of the corresponding connecting rod 4 so as to assemble each fish-eye universal joint 2 with the corresponding connecting rod 4; inserting the fisheye bearing section 21 of the fisheye gimbal 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 holes 211a of the fisheye bearing section 21 of the fisheye gimbal 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 using the pins 3 to pass through the through holes 211a of the fisheye bearing section 211 of the fisheye gimbal 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 bearing section 211 of the fisheye bearing section 21 of the fisheye gimbal 2 and fixedly connect the fisheye bearing section 21 of the fisheye gimbal 2 with the mounting section 12 of the clamp pull rod 1, thereby completing the assembly of the fisheye gimbal 2 and the clamp pull rod 1; one end of each tension section 11 of the clamp pull rod 1 is connected with a coating strength tensile testing machine, so that the subsequent coating strength tensile test can be performed.
In the clamp 100 for testing the bonding strength of the coating of the present disclosure, by providing the respective pair of clamp units U with the fisheye universal joint 2, since the fisheye bead 211, the pin 3 and the two flat plate parts 121 are fixed together and since the respective tension sections 11 of the clamp pull rod 1 are fixedly connected to the tensile tester for coating strength, and since the sample 200 to be tested, the two clamp pull heads 5 and the two connecting pull rods 4 form a combined body, the limit frame 212 and the outer frame 213 of the fisheye bearing section 21 of the two pair of clamp units U together with the whole stud section 22 and the combined body can be rotated relative to the fisheye bead 211, the pin 3 and the respective tension sections 11 of the two flat plate parts 121 and the clamp pull rod 1 which are fixed together, even if a transverse shearing force is generated in parallel to the coating 200b due to various reasons during the coating bonding strength test, the transverse shearing force in parallel to the direction of the coating 200b can be eliminated by such rotation, and since the two dual clamp units U are arranged 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 during the coating bonding strength test, after eliminating such transverse shearing force, the two dual clamp units U are always subjected to an axial force (collinear force in the up-down direction of fig. 1) under the tensile force of the coating strength tensile tester, thereby ensuring consistency, repeatability, reliability, and accuracy of the results of the coating strength tensile test. In addition, since the members of each pair of jig units U are detachably assembled, the operation of the jig 100 for coating bonding strength test is simple and convenient.
The various exemplary embodiments are described using the above detailed description, but are not intended to be limited to the combinations explicitly disclosed herein. Thus, unless otherwise indicated, the various features disclosed herein may 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, on which a coating (200 b) is arranged on a substrate (200 a) so as to test the bonding strength of the coating, and is characterized in that,
Each pair of clamping units (U) comprises a clamping pull rod (1), a fish-eye universal joint (2), a pin (3) and a connecting pull rod (4);
The fixture pull rod (1) comprises a tension section (11) and a mounting section (12), one end of the tension section (11) is used for being connected with a coating strength tensile testing machine, the other end of the tension section (11) is connected with the mounting section (12), the mounting section (12) comprises two flat plate parts (121), the two flat plate parts (121) are spaced apart and symmetrical to each other, the center line of a 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 (121 a) in a penetrating manner in the thickness direction, and the cylindrical holes (121 a) of the two flat plate parts (121) are aligned with each other;
The fish-eye universal joint (2) comprises a fish-eye bearing section (21) and a stud section (22), the fish-eye bearing section (21) comprises a fish-eye bead (211), a limiting frame (212) and an outer frame (213), the limiting frame (212) is embedded in the outer frame (213), the fish-eye bead (211) is embedded in the limiting frame (212) and can rotate relative to the limiting frame (212), the fish-eye bead (211) is a spherical bead and is provided with a through cylindrical through hole (211 a) along a spherical center line, the fish-eye bearing section (21) is used for being positioned on an installation section (12) of a clamp pull rod (1), the stud section (22) is connected with the fish-eye bearing section (21), the stud section (22) is provided with an external thread (221), and the axis of the stud section (22) is collinear with the central line of a symmetrical plane of two flat plate parts (121) and the central line of a tension section (11);
the pin (3) is used for penetrating through a through hole (211 a) of the fisheye bead (211) of the fisheye bearing section (21) of the fisheye universal joint (2) and cylindrical holes (121 a) of two flat plate parts (121) of the 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), 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 tested in an adhering manner;
Wherein 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 with the coating strength tensile testing machine.
2. The clamp (100) for testing the bonding strength of a coating according to claim 1, wherein the tension section (11) is a single flat plate section.
3. The clamp (100) for testing the bonding strength of the coating according to claim 1, wherein the clamp pull rod (1) further comprises a chamfer transition section (13), and the chamfer transition section (13) connects the tension section (11) and the mounting section (12) by adopting a circular arc chamfer.
4. The clamp (100) for testing the bonding strength of a coating according to claim 1, wherein the fisheye gimbal (2) further comprises an intermediate transition section (23), and the intermediate transition section (23) necks-connects the fisheye bearing section (21) and the stud section (22).
5. The clamp (100) for testing the bonding strength of the coating according to claim 1, wherein the depth of the internal thread (411) of the first connecting section (41) is larger than the length of the external thread (221) of the stud section (22).
6. The clamp (100) for testing the bonding strength of a coating according to claim 1, wherein the connecting rod (4) further comprises a centering transition section (43), the centering transition section (43) connecting the first connecting section (41) and the second connecting section (42).
7. The jig (100) for testing bonding strength of coating layer 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 fixture (100) for testing bonding strength of a coating according to claim 1, wherein the second connecting section (42) is adapted to be directly adhesively and fixedly connected to one of opposite surfaces of the sample (200) to be tested.
9. The jig (100) for testing bonding strength of coating according to claim 1, wherein,
The second connecting section (42) is used for being indirectly and fixedly connected to one of the two opposite surfaces of the sample (200) to be tested;
Each pair of clamp units (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 adhered and fixedly connected to one of two opposite surfaces of the sample (200) to be tested.
10. The jig (100) for testing bonding strength of coating according to claim 9, wherein,
The second connecting section (42) is provided with an omega-shaped through hole (422) at the end surface (421) facing away from the first connecting section (41), the axis of the omega-shaped through hole (422) is vertical 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 surface (421) of the second connecting section (42);
The fixture pull head (5) comprises an omega-shaped pin shaft (51) and a cylinder (52) which are connected with each other, wherein 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 perpendicular to the axis of the cylinder (52), and the outer end surface (521) of the cylinder (52) is used for being directly and fixedly connected to one of two opposite surfaces of a sample (200) to be tested.
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