A jig and method for measuring the bonding strength of NdFeB coatings

Abstract

The present invention discloses a jig and a method for measuring the bonding strength of NdFeB coatings. The jig includes a first jig, a second jig, and a carrier sheet. The first jig is provided with a through hole. The carrier sheet is clamped between the first jig and the second jig. The product to be tested is affixed to the carrier sheet and completely placed in the through hole. The product to be tested is a NdFeB substrate containing a coating. The method for measuring the bonding strength of NdFeB coatings includes the following steps: after affixing the product to be tested to the carrier sheet, the carrier sheet is clamped between the first jig and the second jig, and the product to be tested is completely placed in the through hole of the first jig. After lifting the jig containing the product to be tested, it is allowed to fall freely. After multiple tests, the coating falls off, and the number of falls is recorded. The greater the number of falls, the greater the bonding strength of the coating. The jig of the present invention has a simple structure and is accurate and convenient to use for bonding strength measurement.

Description

Technical Field

[0001] The invention relates to the technical field of NdFeB coatings, and in particular to a jig and a method for measuring the bonding strength of NdFeB coatings. Background Art

[0002] Neodymium iron boron (NdFeB), also known as a neodymium iron boron magnet, is a tetragonal crystal composed of neodymium, iron, and boron. Discovered in 1982 by Sumitomo Special Metals' Masato Sagawa, this magnet boasts a greater magnetic energy product than samarium cobalt magnets, holding the world's highest energy product at the time. As the crown jewel of permanent magnets, NdFeB is widely used in electronics, electrical machinery, medical devices, aerospace, and other fields. Common applications include permanent magnet motors, loudspeakers, magnetic separators, computer drives, and hard drives. It is a crucial foundational material supporting the development of modern society and is closely intertwined with our daily lives.

[0003] With the thawing of patented sintered NdFeB technology in countries such as Japan, Germany, and the European Union, the concerted efforts of major sintering manufacturers in my country have significantly improved the quality of sintered NdFeB products. However, in high-end applications, higher requirements are placed on the overall performance of NdFeB, and additional coatings are often used to enhance this performance. NdFeB coatings offer properties such as oxidation resistance, wear resistance, and corrosion resistance. The adhesion of the surface coating to the NdFeB substrate is a key indicator of coating quality, and good adhesion is crucial for the coating's performance. However, there is a lack of effective methods to measure coating adhesion, making it crucial to address this issue. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a jig for measuring the bonding strength of NdFeB coatings.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A jig for measuring the bonding strength of NdFeB coatings comprises a first jig, a second jig and a carrier sheet. The first jig is provided with a through hole, the carrier sheet is sandwiched between the first jig and the second jig, and a product to be tested is adhered to the carrier sheet and completely placed in the through hole. The product to be tested is a NdFeB substrate containing a coating.

[0007] Preferably, a first groove is provided on the first jig, a through hole is provided at the bottom of the first groove, and a second groove is provided on the second jig; a carrier sheet with the product to be tested pasted thereon is placed in the first groove and the second groove, and the product to be tested is placed in the through hole; the first jig and the second jig are fixed together by bolts.

[0008] Preferably, a positioning protrusion is provided on the side of the carrier sheet, and a positioning groove is provided on the side of the first groove, and the positioning protrusion and the positioning groove match each other.

[0009] Preferably, one or more first grooves are provided on the first jig, and one or more second grooves are provided on the second jig.

[0010] Preferably, one or more products to be tested are pasted on the carrier sheet.

[0011] Preferably, the product to be tested is adhered to the carrier sheet by glue.

[0012] Preferably, the carrier sheet is a steel sheet.

[0013] A second object of the present invention is to provide a method for measuring the bonding strength of NdFeB coatings.

[0014] In order to achieve the above object, the present invention provides the following technical solutions:

[0015] A method for measuring the bonding strength of a NdFeB coating comprises the following steps:

[0016] S1: After the product to be tested is attached to the carrier sheet, the carrier sheet is sandwiched between the first jig and the second jig, and the product to be tested is completely placed in the through hole of the first jig, wherein the product to be tested is a NdFeB substrate with a coating;

[0017] S2: Lift the jig containing the product to be tested and let it fall freely. After multiple tests, wait for the coating to fall off and record the number of drops.

[0018] S3: The bonding strength of the coating is determined by the number of drops. The more drops, the greater the bonding strength of the coating.

[0019] Preferably, in step S1, the product to be tested is glued to the carrier sheet, and step S2 is performed after the glue is cured. The glue curing conditions are: placing it in a greenhouse for 4-6 hours; and the free fall height in step S3 is 1.4-1.6 meters.

[0020] Preferably, a drop machine is used to measure the number of drops in step S3, and the drop machine includes a lifting mechanism and a vacuum suction cup, and the vacuum suction cup is fixed on the lifting mechanism.

[0021] Preferably, the lifting mechanism includes a bracket, a motor, a screw, a slider and a slide rod; both ends of the screw are arranged on the bracket and driven by a motor arranged on the bracket, both ends of the slide rod are fixed on the bracket, the slider is sleeved on the screw and the slide rod, and the vacuum suction cup is fixed on the slider.

[0022] Preferably, a scale line is provided on the bracket, and a pointer is provided on the vacuum suction cup.

[0023] The beneficial effects of the present invention are that the jig of the present invention has a simple structure and is accurate and convenient to use for measuring bonding force.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 An exploded view of the jig of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the second metallurgy;

[0028] Figure 3 Schematic diagram of the structure of the carrier sheet;

[0029] Figure 4 It is a structural diagram of the drop machine;

[0030] In the accompanying drawings: 10-first jig, 11-first groove, 12-positioning groove, 13-through hole, 20-second jig, 21-second groove, 30-carrying plate, 31-positioning protrusion, 40-product to be tested, 50-vacuum suction cup, 60-bracket, 70-motor, 80-screw, 90-slider, 100-sliding rod, 110-pointer. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] like Figure 1The present invention discloses a jig for measuring the bonding strength of NdFeB coatings, comprising a first jig 10, a second jig 20, and a carrier sheet 30. The first jig 10 is provided with a through-hole 13, and the carrier sheet 30 is sandwiched between the first jig 10 and the second jig 20. A product 40 to be tested is attached to the carrier sheet 30 and completely positioned within the through-hole 13. The product 40 to be tested is a NdFeB substrate with a coating. The jig of the present invention has a simple structure and allows for accurate and convenient measurements.

[0033] Specifically, the first jig 10 is provided with a first groove 11, the bottom of the first groove 11 is provided with a through hole 13, and the second jig 20 is provided with a second groove 21 (such as Figure 2 As shown); the carrier sheet 30 with the product to be tested 40 is placed in the first groove 11 and the second groove 21, and the product to be tested 40 is placed in the through hole; the first jig 10 and the second jig 20 are fixed together by bolts. As a preferred embodiment, threaded holes are provided at the four corners of the first jig 10 and the second jig 20, and then the first jig 10 and the second jig 20 are fixed together by four bolts.

[0034] During actual measurement, the shapes and sizes of the first groove 11 , the second groove 21 and the through hole 13 can be adjusted according to the shape of the product 40 to be tested, so that the jig can both fix the carrier 30 and place the product 40 to be tested completely in the through hole 13 .

[0035] Specifically, the first jig 10 is provided with one or more first grooves 11, the second jig 20 is provided with one or more second grooves 21, and one or more products to be tested 40 are attached to the carrier sheet 30. As a preferred embodiment, the first jig 10 is provided with multiple first grooves 11, the second jig 20 is provided with multiple second grooves 21, and multiple products to be tested 40 are attached to the carrier sheet 30. This design allows for simultaneous measurement of the bonding strength of multiple products to be tested 40.

[0036] Specifically, the carrier sheet 30 can be a steel sheet.

[0037] As a preferred solution, Figure 3 As shown, a positioning protrusion 31 is provided on the side of the carrier sheet 30, and a positioning groove 12 is provided on the side of the first groove 11. The positioning protrusion 31 and the positioning groove 12 match. By providing the positioning protrusion 31 on the side of the carrier sheet 30, the positioning protrusion 31 is placed in the positioning groove 12 when the carrier sheet 30 is placed. This acts as a limiter for the carrier sheet 30 and prevents it from shaking. In actual installation, the carrier sheet 30 can be configured as a disc or a disk. When configured as a disk, the product to be tested 40 is attached to the bottom surface of the disk.

[0038] As a preferred solution, the product to be tested 40 is glued onto the carrier sheet 30 . Specifically, during the gluing process, the NdFeB matrix in the product to be tested 40 is glued onto the carrier sheet 30 .

[0039] As a preferred solution, notches are provided on the four sides of the first jig 10 and the second jig 20 to facilitate taking them.

[0040] The method for measuring the bonding strength of NdFeB coatings using the jig comprises the following steps:

[0041] S1: After the product to be tested 40 is affixed to the carrier sheet 30, the carrier sheet 30 is sandwiched between the first jig 10 and the second jig 20, with the product to be tested 40 completely placed in the through hole 13 of the first jig 10. The specific process is as follows: the carrier sheet 30 is placed on the second groove 21 of the second jig 20, and then glue is applied to the carrier sheet 30, and then the product to be tested 40 is placed. After the glue is cured, the first jig 10 is covered, so that the carrier sheet 30 with the product to be tested 40 affixed is placed in the first groove 11 of the first jig 10 and the product to be tested 40 is completely placed in the through hole 13 of the first jig 10, and then the first jig 10 and the second jig 20 are fixed together with bolts.

[0042] S2: After the jig containing the product to be tested 40 is lifted up, it is allowed to fall freely. After multiple tests, the coating falls off and the number of drops is recorded;

[0043] S3: The bonding strength of the coating is determined by the number of drops. The more drops, the greater the bonding strength of the coating.

[0044] As a preferred solution, in step S1, the product 40 to be tested is glued to the carrier sheet 30, and step S2 is performed after the glue is cured. The gluing operation can be performed using a glue dispenser. The glue curing conditions are: placing it in a room temperature for 4-6 hours, preferably 5 hours. The free fall height in step S3 is 1.4-1.6 meters, preferably 1.5 meters.

[0045] As a preferred solution, Figure 4 As shown, in step S3, the number of drops is measured using a drop machine. The drop machine includes a lifting mechanism and a vacuum suction cup 50, which is fixed to the lifting mechanism. The lifting mechanism includes a bracket 60, a motor 70, a screw 80, a slider 90, and a slide bar 100. The ends of the screw are mounted on the bracket 60 and driven by the motor 70 mounted on the bracket 60. The ends of the slide bar 100 are fixed to the bracket 60. The slider 90 is mounted on the screw 80 and the slide bar 100, and the vacuum suction cup 50 is fixed to the slider 90.

[0046] During actual measurement, the vacuum chuck 50 is evacuated, and the jig is adsorbed on the vacuum chuck 50. Then, the motor 70 is started, and the screw 80 rotates, so that the slider 90 moves to the specified height. The motor 70 is then turned off, and the vacuum chuck 50 is no longer evacuated. The jig will then fall freely. After multiple tests, the coating will fall off, and the number of drops is recorded. At the same drop height, the more drops, the greater the coating bonding strength.

[0047] As a preferred solution, the bracket 60 is provided with scale lines, and the vacuum cup 50 is provided with a pointer 110. Preferably, the pointer 110 can also be fixed to the vacuum cup 50 via an electric telescopic rod. This allows the height of the jig to be quickly and intuitively observed. When the measurement height needs to be adjusted, the electric telescopic rod is activated and adjusted in length, and the pointer 110 is brought closer to the scale lines, making it easier to observe the jig height data.

[0048] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A jig for measuring the bonding strength of NdFeB coatings, characterized by: The device comprises a first jig, a second jig and a carrier sheet, wherein the first jig is provided with a through hole, the carrier sheet is sandwiched between the first jig and the second jig, the product to be tested is attached to the carrier sheet and the product to be tested is completely placed in the through hole; the product to be tested is a NdFeB substrate with a coating; The first jig is provided with a first groove, and a through hole is provided at the bottom of the first groove; the second jig is provided with a second groove; a carrier sheet with the product to be tested is placed in the first groove and the second groove, and the product to be tested is placed in the through hole; the first jig and the second jig are fixed together by bolts.

2. The jig for measuring the bonding strength of NdFeB coatings according to claim 1, characterized in that: A positioning protrusion is provided on the side of the carrier sheet, and a positioning groove is provided on the side of the first groove, and the positioning protrusion and the positioning groove match each other.

3. The jig for measuring the bonding strength of NdFeB coatings according to claim 1, characterized in that: One or more first grooves are provided on the first jig, and one or more second grooves are provided on the second jig.

4. The jig for measuring the bonding strength of NdFeB coatings according to claim 1, characterized in that: One or more products to be tested are pasted on the carrier sheet.

5. The jig for measuring the bonding strength of NdFeB coatings according to claim 1, characterized in that: The product to be tested is adhered to the carrier sheet by glue.

6. The jig for measuring the bonding strength of NdFeB coatings according to claim 1, characterized in that: The bearing sheet is a steel sheet.

7. A method for measuring the bonding strength of a NdFeB coating, using the jig for measuring the bonding strength of a NdFeB coating as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1: After the product to be tested is attached to the carrier sheet, the carrier sheet is sandwiched between the first jig and the second jig, and the product to be tested is completely placed in the through hole of the first jig, wherein the product to be tested is a NdFeB substrate with a coating; S2: Lift the jig containing the product to be tested and let it fall freely. After multiple tests, wait for the coating to fall off and record the number of drops. S3: The bonding strength of the coating is determined by the number of drops. The more drops, the greater the bonding strength of the coating.

8. The method for measuring the bonding strength of NdFeB coatings according to claim 7, wherein: In step S1, the product to be tested is glued to the carrier sheet, and step S2 is performed after the glue is cured. The glue curing conditions are: placing it in a greenhouse for 4-6 hours; the free fall height in step S3 is 1.4-1.6 meters.

9. The method for measuring the bonding strength of NdFeB coatings according to claim 7, wherein: The number of drops in step S3 is measured using a drop machine, which includes a lifting mechanism and a vacuum suction cup, and the vacuum suction cup is fixed on the lifting mechanism.

10. The method for measuring the bonding strength of NdFeB coatings according to claim 9, wherein: The lifting mechanism includes a bracket, a motor, a screw, a slider and a slide rod; the two ends of the screw are arranged on the bracket and driven by the motor arranged on the bracket, the two ends of the slide rod are fixed on the bracket, the slider is sleeved on the screw and the slide rod, and the vacuum suction cup is fixed on the slider.

11. The method for measuring the bonding strength of NdFeB coatings according to claim 10, wherein: The bracket is provided with scale lines, and the vacuum suction cup is provided with a pointer.

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