阅读说明：本技术 一种uv胶水固化检测方法 (UV glue curing detection method ) 是由 王文宝 孙俊文 宋悦明 钟建莹 于 2021-07-28 设计创作，主要内容包括：本发明涉及一种UV胶水固化检测方法,其可包括以下步骤：S1、提供测试治具和测试板,测试治具设有多个不同深度的凹槽,测试板包括交错排布的多个奇数金手指和多个偶数金手指,其分别并联并引出各自测试端子；S2、根据实际点胶高度要求,选择对应深度的凹槽并将测试板放置在该凹槽中；S3、将UV胶水打入凹槽内的测试板之上,直到UV胶水填满填平凹槽；S4、将点好UV胶水的测试板和测试治具一起放入UV炉中并在预定能量的UV光下固化预定时间；S5、对测试端子进行绝缘电阻测试,当绝缘测试击穿或阻值偏低时,则说明胶水未完全固化,需要进一步增加UV光的能量,并进行重复测试,直到绝缘电阻大于设计值时,判定UV胶水已完全固化。(The invention relates to a UV glue curing detection method, which comprises the following steps: s1, providing a test jig and a test board, wherein the test jig is provided with a plurality of grooves with different depths, and the test board comprises a plurality of odd-numbered golden fingers and a plurality of even-numbered golden fingers which are arranged in a staggered manner and are respectively connected in parallel and lead out respective test terminals; s2, selecting a groove with a corresponding depth according to the actual dispensing height requirement and placing the test board in the groove; s3, driving the UV glue into the test board in the groove until the UV glue fills and levels the groove; s4, placing the test board with the UV glue and the test fixture into a UV furnace and curing for a preset time under the UV light with preset energy; and S5, performing insulation resistance test on the test terminal, wherein when the insulation test is broken down or the resistance value is low, the glue is not completely cured, the energy of UV light needs to be further increased, and repeating the test until the insulation resistance is greater than the designed value, and the UV glue is judged to be completely cured.)

1. A UV glue curing detection method is characterized by comprising the following steps:

s1, providing a test fixture and a test board, wherein the test fixture is provided with a plurality of grooves with different depths, the test board comprises a plurality of odd-numbered golden fingers and a plurality of even-numbered golden fingers which are arranged in a staggered mode, and the odd-numbered golden fingers and the even-numbered golden fingers are respectively connected in parallel and lead out respective test terminals;

s2, selecting a groove with a corresponding depth according to the actual dispensing height requirement and placing the test board in the groove;

s3, driving the UV glue into the test board in the groove, and enabling the bottom of the UV glue to be completely contacted with the golden finger of the test board until the groove is filled with the UV glue;

s4, placing the test board with the UV glue and the test fixture into a UV furnace and curing for a preset time under the UV light with preset energy;

and S5, performing insulation resistance test on the test terminal, wherein when the insulation test is broken down or the resistance value is low, the glue is not completely cured, the energy of UV light needs to be further increased, and repeating the test until the insulation resistance is greater than the designed value, and the UV glue is judged to be completely cured.

2. The method of claim 1, wherein a bar is provided at the opening of the recess, the bar forming a notch with the side wall of the recess to allow access to the test terminals.

3. The method of claim 1, wherein a spacing between the odd gold fingers and the even gold fingers is 0.05-0.1 mm.

4. The method of claim 1, wherein the depth of the groove is 3-15 mm.

5. The method of claim 4, wherein the grooves have depths of 3mm, 5mm, 8mm, 11mm, and 15mm, respectively.

6. The method of claim 1, wherein in S2, the principle of selecting the groove with the corresponding depth is that the depth of the groove is not less than the actual dispensing height requirement and the difference with the actual dispensing height requirement is minimal.

7. The method of claim 1, wherein the predetermined time is determined by a time of a curing process in an actual production process in S4, and the preset energy is 50% of a maximum energy of the UV light at the time of the actual curing.

8. The method of claim 7, wherein the energy per increment is 10% of the maximum energy in S5.

9. The method of claim 1, wherein in S5, the insulation resistance tester is used to perform an insulation resistance test on the test terminals.

10. The method of claim 1, wherein the design value is 10 megaohms at S5.

Technical Field

The invention relates to the field of circuit boards, in particular to a UV glue curing detection method.

Background

The UV adhesive is widely applied to welding of circuit boards and elements and the like to carry out insulation protection, foreign body short circuit prevention, water and moisture prevention and the like. UV glues need pass through UV light irradiation, just can reach the solidification state, when UV glues not complete solidification, can cause the product function bad even scrap scheduling problem. Before the curing, the UV adhesive is generally cut, whether the UV adhesive reaches a dry state or not is judged by manual visual inspection and manual contact, the UV adhesive is completely cured, mass production is carried out when the UV adhesive is completely cured, and when the UV adhesive is not completely cured, energy parameters are adjusted and secondary testing is carried out. However, the cutting position cannot be judged through data analysis, so that manual judgment deviation exists, a curing critical point can be reached, a small amount of incompletely cured materials cannot be cut and found, the phenomenon of insufficient batch curing can be caused, and the risk potential can be caused.

Disclosure of Invention

The invention aims to provide a UV glue curing detection method to solve the problems. Therefore, the invention adopts the following specific technical scheme:

a UV glue curing detection method can comprise the following steps:

s1, providing a test fixture and a test board, wherein the test fixture is provided with a plurality of grooves with different depths, the test board comprises a plurality of odd-numbered golden fingers and a plurality of even-numbered golden fingers which are arranged in a staggered mode, and the odd-numbered golden fingers and the even-numbered golden fingers are respectively connected in parallel and lead out respective test terminals;

s2, selecting a groove with a corresponding depth according to the actual dispensing height requirement and placing the test board in the groove;

s3, driving the UV glue into the test board in the groove, and enabling the bottom of the UV glue to be completely contacted with the golden finger of the test board until the groove is filled with the UV glue;

s4, placing the test board with the UV glue and the test fixture into a UV furnace and curing for a preset time under the UV light with preset energy;

and S5, performing insulation resistance test on the test terminal, wherein when the insulation test is broken down or the resistance value is low, the glue is not completely cured, the energy of UV light needs to be further increased, and repeating the test until the insulation resistance is greater than the designed value, and the UV glue is judged to be completely cured.

Further, the opening part of recess is equipped with a blend stop, the blend stop with the lateral wall of recess forms and lets to be located test terminal's breach.

Further, the distance between the odd gold fingers and the even gold fingers is 0.05-0.1 mm.

Further, the depth of the groove is 3-15 mm.

Further, the depth of the groove is 3mm, 5mm, 8mm, 11mm and 15mm, respectively.

Further, in S2, the principle of selecting the groove with the corresponding depth is that the depth of the groove is not less than the actual dispensing height requirement and the difference between the actual dispensing height requirement and the groove is the minimum.

Further, in S4, the predetermined time depends on the time of the curing process in the actual production process, and the preset energy is 50% of the maximum energy of the UV light at the time of the actual curing.

Further, in S5, the energy per increment is 10% of the maximum energy.

Further, in S5, the insulation resistance test is performed on the test terminal using the insulation resistance tester.

Further, in S5, the design value is 10 megaohms.

By adopting the technical scheme, the invention has the beneficial effects that: whether glue solidifies can be accurately judged, manual judgment deviation is avoided, risks are reduced, and abnormal products are prevented from flowing out.

Drawings

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

FIG. 1 is a flow chart of a UV glue curing detection method according to the present invention;

FIG. 2 is a schematic view of a test fixture according to the present invention;

FIG. 3 is a schematic view of a test plate of the present invention;

fig. 4 is a schematic diagram of a test board placed in a groove of a test fixture.

Detailed Description

The invention will now be further described with reference to the accompanying drawings and detailed description.

As shown in fig. 1-3, a method for detecting UV glue curing may include the following steps:

s1, providing the test fixture 1 and the test board 2 (see fig. 2 and 3). The test fixture 1 is provided with a plurality of grooves 11 of different depths. The test fixture 1 is a rectangular plate. The material of test fixture 1 is preferably the contest steel material, and recess 11 adopts the CNC mode processing of finishing impression. The depth of the groove 11 can be designed to be 3-15mm according to the actual dispensing height requirement. In the illustrated embodiment, there are two rows of 5 grooves 11, each having a depth of 3mm, 5mm, 8mm, 11mm and 15mm (e.g., from left to right). In order to facilitate the test board 2 to be positioned on the test fixture 1, a barrier strip 12 is arranged at the opening of the groove 11, and the barrier strip 12 and the side wall of the groove 11 form a notch 13 for the test terminal 23 of the test board 2 to be positioned.

The test board 2 is substantially U-shaped and may be a Flexible Printed Circuit (FPC) or a rigid Printed Circuit Board (PCB). The test board 2 may include a plurality of odd gold fingers 21 and a plurality of even gold fingers 22 arranged in a staggered manner, and the plurality of odd gold fingers 21 and the plurality of even gold fingers 22 are respectively connected in parallel and lead out respective test terminals 23. The distance between the odd gold fingers 21 and the even gold fingers 22 is small, so that the odd gold fingers 21 and the even gold fingers 22 will be turned on or have small resistance when the UV glue is not completely cured. Preferably, the distance between the odd gold fingers 21 and the even gold fingers 22 is 0.05-0.1 mm.

S2, according to the actual dispensing height requirement, selecting the corresponding depth of the groove 11 and placing the test board 2 in the groove 11, as shown in fig. 4. Specifically, the golden finger portion of the test board 2 is located in the groove 11, and the test terminal portion is clamped in the notch 13.

S3, punch the UV glue into the recess 11 on the test board 2, and make the bottom of the UV glue fully contact with the golden fingers 21, 22 of the test board 2 until the UV glue fills up the recess 11.

S4, the test board 2 with the UV glue applied thereto and the test jig 1 are put into a UV oven and cured for a predetermined time under UV light of a predetermined energy, and then the test jig 1 and the test board 2 are taken out of the UV oven. Here, the predetermined time depends on the time of the curing process in the actual production process. For example, if the time of the curing process is 5 seconds, the predetermined time is 5 seconds at the maximum, and is generally set to 4.5 seconds. The predetermined energy is typically 50% of the maximum energy of the UV light at the actual curing.

S5, performing an insulation resistance test on the test terminal 23 by using the insulation resistance tester, wherein when the insulation test is broken down or the resistance value is low, it indicates that the glue is not completely cured, and the energy of the UV light needs to be further increased (for example, 10% each time), and the test is repeated until the insulation resistance is greater than the designed value (for example, 10 megaohms), and it is determined that the UV glue is completely cured. Like this, in actual production technology, only need set up the energy of UV light to the energy of the UV light that uses when testing can ensure the solidification of UV glue, avoid artifical judgement deviation, reduce the risk, avoid abnormal product to flow out.

In addition, the resistance value of the test terminal 23 can be detected in real time on line under the condition that the test fixture 1 and the test board 2 are not taken out of the UV furnace, so that the curing time required under the irradiation of UV light with different energies is determined, and then a curve or a list of the UV light energy and the curing time is obtained.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.