A cylindrical adhesion test sample preparation mold

Abstract

The utility model discloses a kind of cylinder adhesion test sample preparation mould, including upper die, lower die and adjusting bolt, upper die has upper die cavity, lower die has lower die cavity, upper die is set on lower die, so that upper die cavity and lower die cavity butt joint after whole is used to accommodate cylinder sample piece;Adjusting bolt movably passes through one end in the length direction of upper die, so that the one end of adjusting bolt length direction is abutted on the axial end surface of cylinder sample piece, so as to adjust the thickness size of polyurethane foam bonding layer in cylinder sample piece.In the utility model, upper die, left lower die and right lower die constitute adjustable split structure, so that cylinder sample piece is easy to demould, and polyurethane foam bonding layer in sample piece middle part is not affected by demoulding external force.The one end of adjusting bolt length direction is abutted on the axial end surface of cylinder sample piece, so as to adjust the thickness size of polyurethane foam bonding layer in cylinder sample piece, can satisfy laboratory standard for cylinder adhesion test sample preparation and easy to operate.

Description

Technical Field

[0001] This utility model belongs to the field of cylindrical test sample preparation technology, specifically relating to a cylindrical adhesive force test sample preparation mold. Background Technology

[0002] Rigid polyurethane foam is widely used in composite materials, building insulation, and transportation (such as refrigerated trucks) due to its excellent thermal insulation properties, lightweight and high strength, and filling and molding capabilities. When used as a bonding / filler core material, the interfacial bond strength between it and the substrate (such as metal, plastic, or wood) is a key indicator determining the overall structural performance, long-term durability, and safety. Insufficient bond strength can lead to delamination, insulation failure, and even structural damage.

[0003] Currently, the sample preparation molds for cylindrical adhesive strength testing have significant defects in industry applications, directly affecting the accuracy and repeatability of test data. According to Clause 6.3 of ASTM D4541-22 "Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers", the specimen must meet the requirement of "intact and undamaged cylindrical geometry". However, the existing mold sample preparation process exposes the following problems: (1) High demolding damage rate: Traditional integral molds rely on axial ejection for demolding, which causes the specimen to be subjected to longitudinal shear force. Appendix B of ISO 4624:2016 points out that the edge breakage rate of foam / adhesive specimens caused by such operations is generally 12-18%, which is seriously deviated from the standard allowable breakage threshold of ≤5%. (2) Lack of thickness adjustment function: ASTM D4541 does not specify a uniform specimen thickness, but requires that "the thickness deviation of the same batch of specimens shall not exceed ±0.1mm". Existing molds mostly use fixed cavities or manual shims for adjustment. Test data from GB / T 13477.5-2017 shows that this method causes thickness fluctuations of up to ±0.5mm, which directly affects the adhesive strength test value (error exceeding 20%).

[0004] Therefore, a cylindrical adhesive force testing mold with a non-destructive demolding mechanism and precise thickness control is urgently needed. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a cylindrical adhesive force testing sample preparation mold.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0007] This utility model provides a cylindrical bonding force test sample preparation mold, including an upper mold, a lower mold, and an adjusting bolt. The upper mold has an upper cavity along its length direction, and the lower mold has a lower cavity along its length direction. The upper mold is disposed on the lower mold, so that the upper cavity and the lower cavity are joined together to accommodate the cylindrical sample. The adjusting bolt is movably inserted through any end of the upper mold along its length direction, so that any end of the adjusting bolt abuts against any axial end face of the cylindrical sample, thereby adjusting the thickness of the polyurethane foam bonding layer in the cylindrical sample. The axial direction of the cylindrical sample is consistent with the length direction of the upper mold, the lower mold, and the adjusting bolt.

[0008] Preferably, the upper mold includes an upper template, a front template, a rear template, a left template, and a right template, wherein the front template, the rear template, the left template, and the right template are vertically disposed on the lower surface of the upper template and form an upper mold cavity among the five.

[0009] Preferably, the adjusting bolt is movably inserted through the front or rear template and connected by threads.

[0010] Preferably, the lower mold includes a left lower mold and a right lower mold. The left lower mold has a left lower mold cavity that penetrates the front and rear end faces of the left lower mold along its length direction. The right lower mold has a right lower mold cavity that penetrates the front and rear end faces of the right lower mold along its length direction. After the left lower mold and the right lower mold are joined together, the left lower mold cavity and the right lower mold cavity constitute the lower mold cavity.

[0011] Preferably, the lower left mold and the lower right mold are fixedly connected by a first hexagonal bolt and a second hexagonal bolt after they are joined together.

[0012] Preferably, the diameter of the upper mold cavity is the same as the diameter of the lower mold cavity, and the circumference of the upper mold cavity is smaller than the circumference of the lower mold cavity.

[0013] Compared with the prior art, this utility model has the following advantages:

[0014] This invention features an adjustable, split structure consisting of an upper mold, a lower left mold, and a lower right mold. The upper mold cavity is a small semi-circular structure, while the lower mold cavity is a large semi-circular split structure, facilitating easy demolding of the cylindrical sample. The polyurethane foam adhesive layer in the center of the sample is unaffected by demolding forces. Liquid foam release agents can be used with the upper and lower mold cavities to achieve a good skinning effect on the surface of the polyurethane foam adhesive layer formed between the cylindrical samples, further facilitating demolding. One end of the adjusting bolt, along its length, rests against the axial end face of the cylindrical sample, thereby adjusting the thickness of the polyurethane foam adhesive layer within the sample. This design meets the standards for sample preparation for laboratory testing of cylindrical adhesive forces and is easy to operate. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a cylindrical adhesive force testing sample preparation mold according to the present invention;

[0016] Figure 2 for Figure 1 Sectional view along line AA;

[0017] Figure 3 for Figure 2 Sectional view along the BB direction;

[0018] Figure 4 This is a perspective view of a cylindrical adhesive force testing sample preparation mold according to the present invention;

[0019] Figure 5 This is a schematic diagram of the cylindrical sample.

[0020] Among them, 1 is the lower left mold; 2 is the lower right mold; 3 is the first hexagonal bolt; 4 is the second hexagonal bolt; 5 is the upper mold; 6 is the adjusting bolt; 7 is the first cylindrical sample; 8 is the second cylindrical sample; and 9 is the polyurethane foam adhesive layer. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] In the description of this utility model, it should be understood that the terms "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the accompanying drawings. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figures 1 to 5As shown, this embodiment provides a cylindrical bonding force test sample preparation mold, including an upper mold 5, a lower mold, and an adjusting bolt 6. The upper mold 5 has an upper mold cavity along its length direction, and the lower mold has a lower mold cavity along its length direction. The upper mold 5 is disposed on the lower mold, so that the upper mold cavity and the lower mold cavity are joined together to accommodate the cylindrical sample. The adjusting bolt 6 is movably inserted through one end of the upper mold 5 along its length direction, so that one end of the adjusting bolt 6 abuts against one axial end face of the cylindrical sample, thereby adjusting the thickness of the polyurethane foam bonding layer in the cylindrical sample. The axial direction of the cylindrical sample is consistent with the length direction of the upper mold 5, the lower mold, and the adjusting bolt 6.

[0025] In this embodiment, the upper mold 5 includes an upper template, a front template, a rear template, a left template, and a right template. The front template, rear template, left template, and right template are vertically arranged on the lower surface of the upper template, and the five templates form an upper mold cavity.

[0026] In this embodiment, the adjusting bolt 6 is movably inserted into the front template or the rear template and is connected by threads.

[0027] In this embodiment, the lower mold includes a left lower mold 1 and a right lower mold 2. The left lower mold 1 has a left lower mold cavity that extends through the front and rear ends of the left lower mold along its length direction. The right lower mold 2 has a right lower mold cavity that extends through the front and rear ends of the right lower mold along its length direction. After the left lower mold 1 and the right lower mold 2 are joined together, the left lower mold cavity and the right lower mold cavity constitute the lower mold cavity. The left lower mold 1 and the right lower mold 2 are fixedly connected by a first hexagonal bolt 3 and a second hexagonal bolt 4.

[0028] In this embodiment, the diameter of the upper mold cavity is the same as the diameter of the lower mold cavity, and the circumference of the upper mold cavity is smaller than the circumference of the lower mold cavity.

[0029] The working principle of this embodiment will be further explained below:

[0030] During sample preparation, the lower left and lower right molds are first fixed with the first and second hexagonal bolts. Then, liquid foam release agent HY2304C (Huiyue Shanghai New Material Technology Co., Ltd.) is sprayed into the upper and lower mold cavities. The cylindrical sample is then placed in the lower mold cavity, and finally the upper mold is closed onto the lower mold.

[0031] The adjusting bolt is movably inserted into the front template of the upper mold and abuts against the axial end face of the first cylindrical sample. Before foaming, the position of the bolt can be adjusted as needed to adjust the thickness of the polyurethane foam adhesive layer in the cylindrical sample.

[0032] After foaming is complete, first remove the upper mold, then unscrew the first and second hexagonal bolts to separate the lower left and lower right molds, thus achieving demolding.

[0033] The upper mold, lower left mold, and lower right mold constitute an adjustable split structure. The upper mold cavity is a small semi-circular structure, and the lower mold cavity is a large semi-circular split structure. The dimensions of the upper and lower mold cavities make the cylindrical sample easier to demold, and the polyurethane foam adhesive layer in the middle of the sample is not affected by external demolding forces. With the use of liquid foam release agent, the surface of the polyurethane foam adhesive layer 9 formed between the first cylindrical sample 7 and the second cylindrical sample 8 has a good skinning effect and is easy to demold.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A cylindrical adhesive force testing sample preparation mold, characterized in that, The assembly includes an upper mold (5), a lower mold, and an adjusting bolt (6). The upper mold (5) has an upper mold cavity along its length, and the lower mold has a lower mold cavity along its length. The upper mold (5) is mounted on the lower mold, so that the upper mold cavity and the lower mold cavity are joined together to accommodate a cylindrical sample. The adjusting bolt (6) is movably inserted through any end of the upper mold (5) along its length, so that any end of the adjusting bolt (6) along its length abuts against any axial end face of the cylindrical sample, thereby adjusting the thickness of the polyurethane foam adhesive layer in the cylindrical sample. The axial direction of the cylindrical sample is consistent with the length direction of the upper mold (5), the lower mold, and the adjusting bolt (6).

2. The cylindrical adhesive force testing sample preparation mold according to claim 1, characterized in that, The upper mold (5) includes an upper template, a front template, a rear template, a left template, and a right template. The front template, the rear template, the left template, and the right template are vertically arranged on the lower surface of the upper template and form an upper mold cavity between them.

3. The cylindrical adhesive force testing sample preparation mold according to claim 2, characterized in that, The adjusting bolt (6) is movably inserted into the front or rear template and connected by threads.

4. The cylindrical adhesive force testing sample preparation mold according to claim 1, characterized in that, The lower mold includes a left lower mold (1) and a right lower mold (2). The left lower mold (1) has a left lower mold cavity that penetrates the front and rear ends of the left lower mold along its length direction. The right lower mold (2) has a right lower mold cavity that penetrates the front and rear ends of the right lower mold along its length direction. When the left lower mold (1) and the right lower mold (2) are joined together, the left lower mold cavity and the right lower mold cavity constitute the lower mold cavity.

5. A cylindrical adhesive force testing sample preparation mold according to claim 4, characterized in that, The lower left mold (1) and the lower right mold (2) are connected by the first hexagonal bolt (3) and the second hexagonal bolt (4).

6. The cylindrical adhesive force testing sample preparation mold according to claim 1, characterized in that, The upper mold cavity has the same diameter as the lower mold cavity, and the circumference of the upper mold cavity is smaller than that of the lower mold cavity.

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