An adhesive strength test piece bonding jig

Abstract

The utility model belongs to the technical field of bonding structure design, specifically relates to a kind of adhesive strength test piece bonding tool, including upper mould plate, lower mould plate;The upper mould plate and lower mould plate are closed to locate the test piece to be bonded between upper mould plate and lower mould plate;Several support columns are arranged on the upper mould plate, and several support columns I, support column II are correspondingly arranged on the lower mould plate;Support column I is used to support one piece in the test piece to be bonded, and support column II is used to support another piece in the test piece to be bonded;The height difference between support column I and support column II is slightly greater than the thickness of the test piece to be bonded, to ensure that the two bonding plates after gluing are always in horizontal state during glueing curing process.The relative sliding problem of test piece during bonding process and after bonding is reliably solved;The utility model controls time and glue solution cost while ensuring performance, and the test piece bonding tool structure is simple, and test piece bonding quality is reliable.

Description

Technical Field

[0001] This utility model belongs to the field of adhesive structure design technology, specifically relating to an adhesive strength test piece bonding fixture. Background Technology

[0002] Adhesives, as substances that can bond two objects together and provide sufficient strength at the joint, possess unique properties that other materials cannot replace. They are indispensable materials in the aerospace industry. As aircraft develop towards high performance, the requirements for adhesives are becoming increasingly stringent, making performance testing crucial. Performance testing is helpful for controlling product quality, optimizing material formulations, improving production processes, reducing production costs, and enhancing market competitiveness. It also provides users with a scientific basis for understanding the characteristics of adhesive materials, selecting appropriate materials, ensuring correct application, and making accurate evaluations of materials. Currently, adhesive performance testing has become a specialized testing technique and an important component of production and research. Shear force testing exhibits the best performance among adhesives; therefore, it is a necessary means of testing herb properties and an objective basis for evaluating bonding techniques, surface treatment quality of parts, and the quality of bonding process specifications. It is essential for quality control and is the most fundamental testing method in the research, development, production, and application of adhesives. The test results are affected by many factors, and different conditions lead to different test results. Among them, the slippage of the bonded specimen, especially the slippage of the specimen under the applied pressure after bonding, cannot be effectively solved. This leads to the destruction of the cross-linking of the material molecules and the entry of air bubbles during the slippage process, which greatly reduces the strength of the material. Inaccurate test data is not obtained, and multiple tests are often required for comparison, which increases the test cycle and cost budget.

[0003] Currently, the commonly used shear force test involves bonding two test pieces together by overlapping one end of the adhesive. After bonding, the adhesive is still viscous and prone to relative slippage, usually secured with tape. To ensure the adhesive's cured strength, pressure is applied to the fixed test pieces. However, this method is susceptible to slippage when secured with tape, disrupting the molecular cross-linking of the adhesive and affecting the accuracy of the test results. Utility Model Content

[0004] The main purpose of this invention is to provide a bonding fixture for adhesive strength test specimens, thereby solving the problem of relative sliding of the specimens during and after bonding.

[0005] Technical solution: To achieve the above objectives, an adhesive strength test specimen bonding fixture is provided, comprising an upper template and a lower template; the upper template and the lower template are aligned to position the specimen to be bonded between the upper and lower templates; The upper template is provided with several support columns, and the lower template is provided with several support columns I and II respectively. Support column I is used to support one of the test pieces to be bonded, and support column II is used to support the other test piece to be bonded. The height difference between support column I and support column II is slightly greater than the thickness of the test piece to be bonded, so as to ensure that the two bonding plates remain horizontal during the bonding and curing process after the adhesive is applied.

[0006] Furthermore, a positioning pin I is also arranged on the lower template, which engages with the unbonded end hole on the test piece to be bonded.

[0007] Furthermore, two support columns I and one support column II arranged on the same straight line on the lower template constitute a set of positioning support components, and there are several sets of positioning support components on the lower template.

[0008] Furthermore, the positioning support components are arranged in parallel and uniformly, and two adjacent sets of positioning support components are separated by positioning pins II.

[0009] Furthermore, guide posts are provided around the lower template to cooperate with the guide sleeve of the upper template, ensuring that the upper template maintains a fixed direction of movement during the downward pressing process.

[0010] Furthermore, a support is provided at the bottom of the lower template to support the entire tooling.

[0011] Technical benefits: Compared to the previous method, which suffered from unstable air supply and large errors due to specimen slippage after bonding, resulting in unsatisfactory results and repeated retests, the improved method saves on repeated waste of adhesive and specimens, and reduces the time spent on repeated tests. This invention controls time and adhesive costs while ensuring performance. The test specimen bonding fixture has a simple structure, and the bonding quality is reliable. It can also be extended to the bonding of similar products. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the bonding fixture structure of this utility model; Among them, 1-upper template, 2-lower template, 3-guide column, 4-support column, 5-support column II, 6-support column I, 7-positioning pin, 8-support. Detailed Implementation

[0013] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0014] To ensure that the test results of adhesive shear strength can effectively evaluate bonding technology, surface treatment quality of parts, bonding process specifications, and quality control, and to provide a reliable basis for the research, development, production and application of adhesives, a tooling was designed to prevent relative sliding during and after bonding, while also reducing test errors caused by different testers during bonding.

[0015] See appendix Figure 1 As shown, the tooling specifically designed includes an upper template 1 and a lower template 2; the upper template 1 and the lower template 2 are aligned to position the test piece to be bonded between the upper and lower templates; The upper template 1 is provided with several support columns 4, and the lower template 1 is provided with several support columns I 6 and support columns II 5. Support columns I 6 support one of the test pieces to be bonded, and support columns II 5 support the other test piece. The height difference between support columns I and II is slightly greater than the thickness of the test piece to be bonded, to ensure that the two bonded plates remain horizontal during the bonding and curing process after adhesive application. To ensure the alignment of the upper and lower templates during implementation, guide columns 3 are provided on the lower template, which cooperate with guide holes or guide sleeves on the upper template 1. Other stamping devices or other heavy objects can be used during the bonding pressure process.

[0016] Such as this utility model Figure 1 The designed fixture structure, as shown in the diagram, features a height difference between one support column II and two support columns I (both columns I are of equal height). This ensures that the upper end of the specimen does not curl up after bonding, resulting in a sufficiently uniform adhesive layer thickness at the bonded area. The support columns being higher than the lower template facilitates the extrusion of excess adhesive after bonding, preventing accidental bonding of the specimen to the fixture. The guide columns primarily function to cooperate with the upper template. In the specific design, several positioning pins can also be arranged on the upper template 1. The effective positioning of each pin prevents relative sliding of the specimen after bonding. Pin positioning also facilitates observation of the effectiveness of the bonding and the overflow of air bubbles after bonding.

[0017] In the specific implementation process: 1. Selection of test piece specifications: According to commonly used standards GB / T7124, HB5164, HG2609, and GB / T1742, select test pieces with a width of 25mm × thickness of 2mm and a width of 20mm × thickness of 2mm. Each group consists of 5 pairs of test pieces to be bonded simultaneously.

[0018] 2. Bonding fixture design: The test pieces are fixed in place by positioning them on both sides and front and back to prevent them from sliding against each other; the height difference between the two test pieces ensures that the upper part of the test piece does not curl up after bonding, so that the bonded part has a sufficiently uniform adhesive layer thickness; the bonding position and height positioning adopt a support column design to prevent excess adhesive from overflowing due to pressure after bonding and accidentally sticking the test piece to the fixture, making it difficult to remove after bonding and facilitating the observation of the bonded test piece, and to facilitate the overflow of air bubbles during bonding; the positioning on both sides and front and back prioritizes the large-size test pieces, and different support columns I6 and support column II5 are used to accommodate the bonding of other-size test pieces.

[0019] 3. Tooling Material Selection: The tooling material should maintain its dimensional stability and accuracy even under prolonged operation in a 0-300℃ environment and under low load conditions. To meet long-term use requirements, the tooling material undergoes quenching and tempering heat treatment to improve its overall strength and wear resistance; a bluing surface treatment is used to improve its corrosion resistance. In summary, 30CrMnSiA high-grade carbon structural steel is selected for manufacturing the tooling. On one hand, 30CrMnSiA material is designed to remain undeformed under long-term operation in a 0-300℃ environment and under low load conditions; on the other hand, 30CrMnSiA material can have its mechanical properties and wear resistance improved through heat treatment and tempering.

[0020] Comparing the bonding effect of the specimens of this utility model with that of traditional specimen bonding, the bonding fixture for adhesive strength test specimens designed in this utility model significantly improves the overall flatness of the specimens compared to traditional bonding methods, resulting in reliable quality; while ensuring performance, it also controls time and adhesive costs.

[0021] The above specific embodiments or examples are only used to explain the technical solutions of this utility model and are not intended to limit this utility model. Parts not described in detail are considered as conventional technical means in the field. Those skilled in the art should understand that, based on the design concept of this application, adaptive modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A bonding fixture for adhesive strength test specimens, characterized in that, Includes an upper template and a lower template; the upper template and the lower template are aligned to position the test piece to be bonded between the upper and lower templates; The upper template is provided with several support columns, and the lower template is provided with several support columns I and II respectively. Support column I is used to support one of the test pieces to be bonded, and support column II is used to support the other test piece to be bonded. The height difference between support column I and support column II is slightly greater than the thickness of the test piece to be bonded, so as to ensure that the two bonding plates remain horizontal during the bonding and curing process after the adhesive is applied.

2. The adhesive strength test specimen bonding fixture as described in claim 1, characterized in that, The lower template is also provided with a positioning pin I, which engages with the unbonded end hole on the test piece to be bonded.

3. The adhesive strength test specimen bonding fixture as described in claim 2, characterized in that, Two support columns I and one support column II arranged on the same straight line on the lower template form a set of positioning support components, and there are several sets of positioning support components on the lower template.

4. The adhesive strength test specimen bonding fixture as described in claim 3, characterized in that, The positioning support components are arranged in parallel and uniformly, and two adjacent sets of positioning support components are separated by positioning pins II.

5. The adhesive strength test specimen bonding fixture as described in claim 1, characterized in that, Guide posts are provided around the lower template, which cooperate with the guide sleeve of the upper template to ensure that the upper template maintains a fixed direction of movement during the downward pressing process.

6. The adhesive strength test specimen bonding fixture as described in claim 1, characterized in that, The bottom of the lower template is provided with a support to support the entire tooling.

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